阅读说明：本技术 一种干热岩地热开采利用方法及系统 (Hot dry rock geothermal exploitation and utilization method and system ) 是由 姬长发 常晔 陈蓉 张欢 姬晨阳 于 2019-09-23 设计创作，主要内容包括：本发明公开了一种干热岩地热开采利用方法及系统,其方法包括步骤：一、地热能探测及钻井；二、固定支撑板；三、制备地下岩层换热管；四、连接布液箱与地下岩层换热管；五、地下岩层换热管下井；六、热源侧供水总管、热源侧回水总管下井；七、热源侧管路和一次热网管路的连接；八、一次热网管路和二次热网管路的连接；九、二次热网管路和负荷侧管路的连接；十、热源侧管路数据采集与监控线路的连接；十一、地上换热系统侧管路数据采集与监控线路的连接；十二、地下换热系统运行。本发明步骤简单、设计新颖、方便节能,能够实现高效的地热开采及利用,并且可以达到很好的节能效果,实用性强,推广应用价值高。(The invention discloses a method and a system for exploiting and utilizing geothermal heat of hot dry rock, wherein the method comprises the following steps: firstly, detecting geothermal energy and drilling a well; secondly, fixing the supporting plate; thirdly, preparing an underground rock stratum heat exchange tube; fourthly, connecting the liquid distribution box with the underground rock stratum heat exchange tube; fifthly, the underground rock stratum heat exchange pipe goes down the well; sixthly, putting the heat source side water supply main pipe and the heat source side water return main pipe into a well; seventhly, connecting a heat source side pipeline with a primary heat supply network pipeline; eighthly, connecting the primary heat supply network pipeline and the secondary heat supply network pipeline; ninth, the connection of the secondary heat supply network pipeline and the load side pipeline; tenth, connecting the data acquisition and monitoring circuit of the heat source side pipeline; eleven, connecting a data acquisition and monitoring circuit of a side pipeline of the ground heat exchange system; and twelfth, operating the underground heat exchange system. The method has the advantages of simple steps, novel design, convenience, energy conservation, capability of realizing efficient geothermal exploitation and utilization, capability of achieving a good energy-saving effect, strong practicability and high popularization and application values.)

1. The geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps:

firstly, carrying out geothermal energy detection, drilling a main well (5-1), drilling an annular groove hole at the bottom of the main well (5-1), and drilling a plurality of auxiliary wells uniformly distributed around the main well (5-1) at the bottom of the main well (5-1);

secondly, hoisting and fixing a support plate (3) for fixedly supporting the well mouths of the multiple auxiliary wells into an annular groove hole at the bottom of the main well (5-1);

step three, preparing an underground rock stratum heat exchange tube (4);

step four, connecting the liquid distribution box (6) with the underground rock stratum heat exchange tube (4);

fifthly, simultaneously putting a plurality of groups of underground rock stratum heat exchange tubes (4) into the main well (5-1), ensuring that the sections of the corresponding positions of the underground rock stratum heat exchange tubes (4) are positioned at the same horizontal plane position through a horizontal detector, and ensuring that the sections of the corresponding positions of the underground rock stratum heat exchange tubes (4) smoothly pass through the supporting plate (3) and enter each auxiliary well; when the underground rock stratum heat exchange tube (4) advances to the tail end of the auxiliary well, the liquid distribution box (6) accurately falls on the set position on the supporting plate (3) to finish the well descending and fixing of the liquid distribution box (6);

sixthly, putting the heat source side water supply main pipe (1-6) and the heat source side water return main pipe (1-7) into the main well (5-1) and reaching the position of the liquid distribution box (6);

seventhly, connecting a heat source side water supply main pipe (1-6) and a heat source side water return main pipe (1-7) with a heat source side interface of the lotus root removing tank (2-5), and connecting a primary heat supply network water supply pipe (1-1) and a primary heat supply network water return pipe (1-2) with a heat supply network side interface of the lotus root removing tank (2-5);

step eight, connecting a secondary heat supply network water supply pipe (1-4) to a reserved interface of a primary heat supply network water supply pipe (1-1), connecting a secondary heat supply network water return pipe (1-5) to a reserved interface of a primary heat supply network water return pipe (1-2), and connecting the secondary heat supply network water supply pipe (1-4) and the secondary heat supply network water return pipe (1-5) with a heat supply network side interface of a heat exchange station (2-4);

ninthly, connecting a load side water supply pipe (1-8) and a load side water return pipe (1-9) with a load side interface of the heat exchange station (2-4);

tenth, connecting the heat source side pipeline data acquisition and monitoring circuit;

eleven, connecting the data acquisition and monitoring circuit of the pipeline at the side of the overground heat exchange system;

step twelve, the cold heat exchange fluid enters a main well (5-1) from a heat source side water supply main pipe (1-6), enters an underground rock stratum heat exchange pipe (4) through a liquid distribution box (6), absorbs the heat of the underground rock stratum after passing through an underground heat exchange system, increases the temperature to become the heat exchange fluid, and the heat exchange fluid enters a heat source side water return main pipe (1-7) from the underground rock stratum heat exchange pipe (4) and the liquid distribution box (6); the heat exchange fluid enters a side pipeline of the ground heat exchange system from the lotus root removing tank (2-5), and finally the heat energy is used by a terminal user; the cold heat exchange fluid enters the underground rock stratum heat exchange tube (4) from the fluid distribution box (6) to be subjected to primary heating; when the heat exchange fluid heated by the first stage reaches the tail end of the underground rock stratum heat exchange tube (4), the heat exchange fluid reversely flows towards the liquid distribution box (6) and exchanges heat in the underground rock stratum heat exchange tube (4) to carry out second-stage heating; and in the running process of the underground heat exchange system, the underground data acquisition and monitoring system is used for monitoring and controlling related parameters of the underground heat exchange system.

2. The geothermal exploitation and utilization method for the hot dry rock according to claim 1, wherein: a heat-insulating cement sleeve is arranged in the main well (5-1), a heat-conducting cement sleeve is arranged in the auxiliary well (5-2), and a heat-conducting agent is coated in a gap between the heat-conducting cement sleeve and the dry-hot rock stratum (4-11); an infrared irradiation instrument is arranged in an annular groove hole at the bottom of the main well (5-1), and an infrared signal receiver for receiving an infrared signal emitted by the infrared irradiation instrument is arranged on the M-M end plate (3-2); the supporting plate (3) comprises an L-L end plate (3-1) and an M-M end plate (3-2), an X-shaped rib plate (3-3) is arranged on the L-L end plate (3-1), and the M-M end plate (3-2) is a movable end plate; the lower part of the M-M end plate (3-2) is provided with a guide plate made of elastic materials, and the L-L end plate (3-1) and the M-M end plate (3-2) are symmetrically provided with reserved holes (3-6) for the underground rock stratum heat exchange tubes (4) to pass through.

3. The geothermal exploitation and utilization method for the hot dry rock according to claim 1, wherein: the number of the guide plates is two, and the guide plates are respectively a 45-degree guide plate (3-4) and a 135-degree guide plate (3-5);

and in the fifth step, in the process that the underground rock stratum heat exchange tube (4) enters each auxiliary well, the speed of descending the underground rock stratum heat exchange tube (4) is adjusted according to the stress deformation characteristics of the 45-degree guide plates (3-4) and the 135-degree guide plates (3-5), so that the 45-degree guide plates (3-4) and the 135-degree guide plates (3-5) generate elastic deformation at an angle of 45 degrees.

4. The geothermal exploitation and utilization method for the hot dry rock according to claim 1, wherein: the underground rock stratum heat exchange tube (4) comprises a concentric sleeve (4-1), a heat exchange packaging sleeve (4-3) and a monitoring disc (4-14), the tail end of the concentric sleeve (4-1) is closed, a high-temperature phase change heat storage material (4-2) is filled in an interlayer of the concentric sleeve (4-1), the heat exchange packaging sleeve (4-3) is fixed in the inner cavity of the concentric sleeve (4-1), the heat exchange packaging sleeve (4-3) is provided with a liquid injection pipe (4-5) and a liquid return cavity (4-6) which are symmetrically arranged, the interlayer of the heat exchange packaging sleeve (4-3) is filled with a low-temperature phase change heat storage material (4-4), and the heat exchange packaging sleeve (4-3) is provided with symmetrically arranged data line collecting pipes (4-7).

The three concrete processes for preparing the underground rock stratum heat exchange tube (4) are as follows:

301, filling a solid-phase high-temperature phase change heat storage material (4-2) in an interlayer of the concentric sleeve (4-1);

302, fastening a heat exchange packaging sleeve (4-3) in an inner cavity of a concentric sleeve (4-1);

step 303, filling a solid-phase low-temperature phase change heat storage material (4-4) into the interlayer of the heat exchange packaging sleeve (4-3);

step 304, fixing a monitoring disc (4-14) at the tail end of the underground rock stratum heat exchange tube (4);

305, mounting a temperature sensor (4-8), a vacuum degree sensor (4-9) and a flow velocity sensor (4-10) to corresponding positions of a monitoring disc (4-14);

step 306, respectively connecting a data line of a temperature sensor (4-8), a data line of a vacuum degree sensor (4-9) and a data line of a flow velocity sensor (4-10) with the temperature sensor (4-8), the vacuum degree sensor (4-9) and the flow velocity sensor (4-10) through a reserved pore passage of a monitoring disc (4-14), and then collecting the data lines into a data line collecting pipe (4-7) in a heat exchange packaging sleeve (4-3);

307, determining the lengths of the underground rock stratum heat exchange tubes (4) in the auxiliary wells (5-2) according to the actually measured lengths of the auxiliary wells;

308, repeating the steps 301 to 307 until the preparation of the underground rock stratum heat exchange tube (4) is completed.

5. The geothermal exploitation and utilization method for the hot dry rock according to claim 4, wherein: the liquid distribution box (6) comprises a shell (6-1), an A-A end plate (6-2), a C-C end plate (6-3), an E-E end plate (6-4) and a G-G end plate (6-5), a closed area formed by the A-A end plate (6-2), the C-C end plate (6-3) and the shell (6-1) in an enclosing mode forms a liquid collection cavity, a closed area formed by the C-C end plate (6-3), the E-E end plate (6-4) and the shell (6-1) in an enclosing mode forms a signal line cavity (6-12), a closed area formed by the E-E end plate (6-4), the G-G end plate (6-5) and the shell (6-1) in an enclosing mode forms a liquid distribution cavity, and a plurality of liquid distribution holes (6-9) distributed symmetrically are formed in the A-A end plate (6-2) in a grouping mode ) The liquid return holes (6-15) and the data line wire collecting holes (6-16) are formed in the C-C end plate (6-3), the liquid return collecting holes (6-10) and a plurality of groups of symmetrically distributed liquid separating holes (6-9) and the data line wire collecting holes (6-16) are formed in the C-C end plate (6-3), the E-E end plate (6-4) is provided with the liquid return collecting holes (6-10) and a plurality of groups of symmetrically distributed liquid separating holes (6-9), the G-G end plate (6-5) is provided with a group of symmetrically distributed liquid injection collecting holes (6-19) and liquid return collecting holes (6-10), and the liquid distributing pipes (6-8) are connected with the liquid distributing holes (6-9) in the E-E end plate (6-4) through the liquid distributing holes (6-9) in the A-A end plate (6-2), the liquid return collecting pipe (6-7) is connected with a liquid return collecting hole (6-10) on the C-C end plate (6-3) and a liquid return collecting hole (6-10) on the G-G end plate (6-5), the bottom of the A-A end plate (6-2) is provided with an X-shaped slotted hole (6-14), a vacuum pumping valve (6-20) and a vacuum degree sensor (4-9) are arranged in a signal line cavity (6-12) of the liquid distribution box (6), and the liquid return collecting pipe (6-7) and the liquid injection collecting pipe (6-6) of the liquid distribution box (6) are internally provided with a temperature sensor (4-8) and a flow velocity sensor (4-10);

when the liquid distribution box (6) and the underground rock stratum heat exchange tube (4) are connected in the fourth step, liquid distribution holes (6-9), liquid return holes (6-15) and data line collecting holes (6-16) in an A-A end plate (6-2) of the liquid distribution box (6) are respectively connected with liquid injection tubes (4-5), liquid return cavities (4-6) and data line collecting tubes (4-7) in the heat exchange packaging sleeve (4-3);

when the liquid distribution box (6) accurately falls on the set position of the support plate (3) in the fifth step, the X-shaped rib plate (3-3) on the L-L end plate (3-1) is matched with the X-shaped slotted hole (6-14) at the bottom of the A-A end plate (6-2);

in the sixth step, the heat source side water supply main pipe (1-6) and the heat source side water return main pipe (1-7) are lowered into the main well (5-1) and reach the position of the liquid distribution box (6), namely the position of a G-G end plate (6-5) of the liquid distribution box (6), and the heat source side water supply main pipe (1-6) and the heat source side water return main pipe (1-7) are respectively connected with a collecting pipe (6-6) and a liquid return collecting pipe (6-7) on the G-G end plate (6-5) of the liquid distribution box (6);

when the cold heat exchange fluid enters the underground rock stratum heat exchange tube (4) through the liquid distribution box (6) in the twelfth step, the cold heat exchange fluid firstly enters the liquid distribution cavity (6-11) through the liquid injection collecting holes (6-19) on the G-G end plate (6-5) of the liquid distribution box (6); the cold heat exchange fluid enters a liquid separating pipe (6-8) from liquid separating holes (6-9) symmetrically distributed on an E-E end plate (6-4) and enters a liquid injection pipe (4-5) in the underground rock stratum heat exchange pipe (4) through the liquid separating holes (6-9) symmetrically distributed on an A-A end plate (6-2);

in the twelfth step, the specific process that the heat exchange fluid enters the heat source side water return main pipe (1-7) from the underground rock stratum heat exchange pipe (4) and the liquid distribution box (6) is as follows: the heat exchange fluid enters the liquid collecting cavity (6-13) from liquid returning cavities (4-6) symmetrically distributed in the underground rock stratum heat exchange tube (4) through liquid returning holes (6-15) on G-G end plates (6-5); the heat exchange fluid enters a liquid return header pipe (6-7) from a liquid return collecting hole (6-10) on a C-C end plate (6-3) and enters a heat source side water return header pipe (1-7) through a liquid return collecting hole (6-10) on a G-G end plate (6-5);

in the twelfth step, the cold heat exchange fluid enters the underground rock stratum heat exchange tube (4) from the liquid distribution box (6), and the specific process of primary heating is as follows: the cold heat exchange fluid enters each liquid injection pipe (4-5) in a plurality of groups of underground rock stratum heat exchange pipes (4) from liquid distribution holes (6-9) symmetrically distributed on an A-A end plate (6-2) of the liquid distribution box (6), flows towards the tail end direction of each group of underground rock stratum heat exchange pipes (4) along the liquid injection pipes (4-5), and is absorbed and recovered by the liquid injection pipes (4-5) to the heat of the heat exchange fluid in the liquid cavities (4-6) for primary heating;

in the twelfth step, when the heat exchange fluid after the first-stage heating reaches the tail end of the underground rock stratum heat exchange tube (4), the heat exchange fluid reversely flows towards the liquid distribution box (6) and exchanges heat in the underground rock stratum heat exchange tube (4), and the specific process of secondary heating is as follows: the heat exchange fluid heated by the first stage reversely flows into each liquid return cavity (4-6), flows towards the liquid distribution box (6) along the liquid return cavities (4-6), the inner wall of the concentric sleeve (4-1) exchanges heat with the high-temperature phase-change heat storage material (4-2), the high-temperature phase-change heat storage material (4-2) exchanges heat with the dry heat rock stratum (4-11) through the outer wall of the concentric sleeve (4-1), the heat exchange fluid indirectly takes heat from the dry heat rock, and meanwhile the heat exchange fluid heated by the first stage exchanges heat with the low-temperature phase-change heat storage material (4-4) in the liquid return cavities (4-6); when the heat exchange fluid reaches the A-A end plate (6-2) of the liquid distribution box (6), the heat exchange fluid flows into the liquid return holes (6-15) symmetrically distributed on the A-A end plate (6-2).

6. The geothermal exploitation and utilization method for the hot dry rock according to the claim, characterized in that: the underground data acquisition and monitoring system comprises a temperature sensor (4-8), a vacuum degree sensor (4-9), a flow velocity sensor (4-10), a temperature sensor data line, a vacuum degree sensor data line, a flow velocity sensor data line, a data line collecting pipe (4-7), a signal line cavity (6-12), a data transmission line (2-9), a monitoring disc (4-14), a data acquisition module (6-1), a data monitoring module (6-18) and a computer (4-15);

the specific process of performing the connection of the heat source side pipeline data acquisition and the monitoring circuit in the step ten is as follows:

step 1001, installing the temperature sensor (4-8), the vacuum degree sensor (4-9) and the flow velocity sensor (4-10) at corresponding positions of the monitoring disc (4-14);

step 1002, connecting a temperature sensor data wire, a vacuum degree sensor data wire and a flow velocity sensor data wire with the temperature sensor (4-8), the vacuum degree sensor (4-9) and the flow velocity sensor (4-10) through reserved pore passages of a monitoring disc (4-14), and collecting the data wires into a data wire collecting pipe (4-7) in the heat exchange packaging sleeve (4-3);

1003, the data line collecting pipes (4-7) are communicated with signal line cavities (6-12) through data line collecting holes (6-16) in A-A end plates (6-2) of the liquid distribution box (6), data transmission lines (2-9) in a plurality of groups of underground rock stratum heat exchange pipes (4) are collected into 2 groups in the signal line cavities (6-12), and the data line collecting pipes (4-7) are connected to a data collecting module (6-1) and a data monitoring module (6-18) on the ground through data line collecting pipes (4-7) respectively arranged in heat source side water supply main pipes (1-6) heat insulation layers and heat source side water return main pipes (1-7) heat insulation layers;

step 1004, connecting the data acquisition module (6-1) and the data monitoring module (6-18) to a computer (4-15) through a data transmission line (2-9);

in the running process of the underground heat exchange system in the twelfth step, the specific process that the underground data acquisition and monitoring system is used for monitoring and controlling the related parameters of the underground heat exchange system is as follows: the flow velocity sensors (4-10) and the temperature sensors (4-8) are arranged on the monitoring discs (4-14), and the vacuum degree sensors (4-9) measure the flow velocity, the temperature and the vacuum degree of the heat exchange fluid at intervals; the data transmission line (2-9) transmits the measured signal to a data acquisition module (6-17) and a data monitoring module (6-18); the data acquisition modules (6-17) and the data monitoring modules (6-18) are used for connecting and displaying the flow velocity signals of the heat exchange fluid at each measuring point, the temperature signals of the heat exchange fluid at each measuring point, the vacuum degree signals of the vacuum cavities (4-13) at each measuring point and the like on the computers (4-15) so as to monitor and control related parameters of the underground heat exchange system.

7. The geothermal exploitation and utilization method for the hot dry rock according to claim 6, wherein: the overground heat exchange system side pipeline comprises a primary heat supply network water supply pipe (1-1), a primary heat supply network water return pipe (1-2), a primary heat supply network bypass pipe (1-3), a secondary heat supply network water supply pipe (1-4), a secondary heat supply network water return pipe (1-5), a load side water supply pipe (1-8) and a load side water return pipe (1-9);

the overground heat exchange system side pipeline data acquisition and monitoring system comprises: the system comprises a heat source circulating pump (2-1), a primary heat supply network circulating pump (2-2), a secondary heat supply network circulating pump (2-3), a differential pressure sensor, a temperature difference sensor, a control actuator (2-7), a data transmission line (2-9), a pressure sensor data line, a temperature sensor data line, a variable frequency regulator, a data acquisition module (6-1), a data monitoring module (6-18) and a computer (4-15);

step eleven, the specific process of performing the connection of the overground heat exchange system side pipeline data acquisition and monitoring circuit is as follows:

1101, additionally arranging a variable frequency regulator on the circulating water pump, wherein the variable frequency regulator is connected to a control actuator (2-7) through a data transmission line (2-9);

step 1102, a temperature sensor (4-8) is installed on a water supply pipe of a system where the circulating water pump is located, one end of a data line of the temperature sensor (4-8) is connected to the temperature sensor (4-8), and the other end of the data line is connected to a control actuator (2-7);

step 1103, installing a temperature sensor (4-8) on a water return pipe of a system where the circulating water pump is located, wherein one end of a data line of the temperature sensor is connected to the temperature sensor (4-8), and the other end of the data line of the temperature sensor is connected to a control actuator (2-7);

1104, repeating 1101, 1102 and 1103, and sequentially accessing a heat source circulating pump (2-1), a primary heat supply network circulating pump (2-2) and a secondary heat supply network circulating pump (2-3) to the data acquisition and monitoring system;

step 1105, installing a flow switch (2-8) on the primary heat supply network bypass pipe (1-3), wherein the flow switch (2-8) is connected with a control actuator (2-7) through a data transmission line (2-9);

step 1106, installing a pressure sensor (2-6) on a primary heat supply network water supply pipe (1-1), wherein one end of a pressure sensor data line is connected to the pressure sensor (2-6), and the other end of the pressure sensor data line is connected to a control actuator (2-7);

110, installing a pressure sensor (2-6) on a primary heat supply network water return pipe (1-2), wherein one end of a pressure sensor data line is connected to the pressure sensor (2-6), and the other end of the pressure sensor data line is connected to a control actuator (2-7);

step 1108, connecting the control actuators (2-7) to the data acquisition module (6-1) and the data monitoring module (6-18) through data transmission lines (2-9) respectively;

and 1109, connecting the data acquisition module (6-1) and the data monitoring module (6-18) with a computer (4-15) through a data transmission line (2-9).

8. The geothermal exploitation and utilization method for hot dry rock according to claim 7, wherein: in the above-ground monitoring control system, the heat source circulating pump (2-1), the primary heat network circulating pump (2-2) and the secondary heat network circulating pump (2-3) run in a variable flow mode, a water supply and return temperature difference control mode is adopted in a variable flow regulation mode, the water supply and return temperature difference of a circulating pipeline where the water pump is located is constant, the rotating speed is adjusted according to the change of the temperature difference, an optimized fuzzy neural network PID control method is adopted in the control method, and the specific process is as follows:

the method comprises the following steps that firstly, a controller periodically samples the temperature difference of supply water and return water;

step two, the controller is according to the formula

Step two, the controller is according to the formula

Step three, the controller will e_iAnd

step four, the controller will e_iAnd

step five, the controller determines the number of nodes of a fuzzy rule layer in the fuzzy neural network;

step six, the controller resolves the ambiguity of the de-ambiguity layer in the fuzzy neural network by adopting a gravity center method to form a node which is used as a node of a PID input layer in the PID neural network;

step seven, the controller enables K_P、K_I、K_DAs three nodes of a PID layer in the PID neural network, the weight of the PID neural network is optimized by adopting an improved bacterial foraging optimization algorithm, so that the K of a static parameter_P、K_I、K_DConverting into a dynamic adjustment form;

the specific process of optimizing the weight of the PID neural network by adopting the improved bacterial foraging optimization algorithm is as follows:

step 701, initializing bacterial foraging optimization algorithm parameters: the bacterial foraging optimization algorithm parameters comprise a search working dimension p of the weight of the total number S, PID of bacteria corresponding to the weight of the PID neural network in the bacterial flora, and chemotaxis times N of the weight of the PID neural network_cMaximum step number N of weight unidirectional motion of PID neural network in chemotaxis process_SAnd the copy number N of the weight of the PID neural network_reAnd the learning times N of the weight of the PID neural network_edMaximum chemotaxis step length C of weight of PID neural network_maxAnd minimum chemotaxis step length C of weight of PID neural network_min；

Step 702, initializing the flora position: by means of random initialization and according to the formula X ═ X_min+rand×(X_max-X_min) Initializing 2S points in p-dimensional space as initialization positions of bacteria, wherein S bacteria are randomly selected as flora X₁The remaining S bacteria are used as flora X₂；X_minFor minimum value of the optimization interval, X_maxFor the maximum value of the optimization interval, X is the initialization position of the bacteria, and rand is uniformly distributed in [0,1 ]]A random number of intervals;

step 703, updating the fitness value: according to the formulaCalculating the fitness value of each bacterium; wherein d is_attractDepth of attraction between bacteria, w_attractWidth of attraction between bacteria, h_repellentHeight of repulsion between bacteria, w_repellentThe width of the repulsion between bacteria, P (i, J, k, l) is the position of the bacteria i after the jth tropism operation, the kth replication operation and the ith migration operation, P (1: S, J, k, l) is a random position in the neighborhood of the current individual P (i, J, k, l), J (1: S, J, k, l)_CC(i, j, k, l) is the fitness value of the bacterium i after the jth tropism operation, the kth replication operation and the l migration operation;

step 704, setting parameters of the circulation variables: wherein the chemotaxis cycle number j is 1 to N_cThe number of reproduction cycles k is 1 to N_reLearning cycle times l is 1-N_ed；

Step 705, entering a chemotaxis cycle to perform chemotaxis operation, wherein the specific method comprises the following steps:

against bacterial flora X₂Chemotaxis of each bacterium was performed according to the following chemotaxis operation of step Q21 to step Q211:

step Q21, reassigning the bacteria i to i +1, judging whether the scale of the bacteria i is smaller than the scale S of the bacteria, executing the step Q22 when the scale of the bacteria i is smaller than the scale S of the bacteria, and executing the step Q212 when the scale of the bacteria i is not smaller than the scale S of the bacteria;

step Q22, calculating the fitness value of the bacterium i;

step Q23, bacteria i are turned one unit step in the randomly generated direction;

step Q24, initializing j to 1;

step Q25, calculating the fitness value of the bacteria i at the new position;

step Q26, judge if j is less than the maximum step number N_cWhen less than, executing the step Q2, and when not less than, jumping to execute the step Q21;

step Q2, reassigning j to j + 1;

step Q28, determining whether the fitness value of bacterium i at the new position has changed, and if so, executing step Q29, and if not, making j equal to N_SAnd jumps to execute step Q26;

step Q29, updating the fitness value of the bacterium i;

step Q210, the bacterial population continues to swim in the overturning direction;

step Q211, jumping to execute step Q25, and continuing to circulate until the value of i in step Q21 is equal to S;

step Q212, the chemotaxis operation is finished;

against bacterial flora X₁Chemotaxis of each bacterium was performed according to the following chemotaxis operation of step Q11 to step Q112:

step Q11, reassigning the bacteria i to i +1, judging whether the scale of the bacteria i is smaller than the bacterial colony scale S, executing a step Q12 when the scale of the bacteria i is smaller than the bacterial colony scale S, and executing a step Q112 when the scale of the bacteria i is not smaller than the bacterial colony scale S;

step Q12, calculating the fitness value of the bacterium i;

step Q13, according to the formulaCalculating a bacterial flora density function factor D (i), and calculating a chemotaxis step length C (i) according to a formula C (i) ═ A.D (i) + B; then turning bacterium i by step length C (i) in the direction of random generation; wherein L is the maximum length in the diagonal of the search space, X (m, i) is the position coordinate value of the bacterium i in the m-th dimension of the search space,

step Q14, initializing j to 1;

step Q15, calculating the fitness value of the bacteria i at the new position;

step Q16, judge if j is less than the maximum step number N_cWhen less than, executing the step Q1, and when not less than, jumping to execute the step Q11;

step Q1, reassigning j to j + 1;

step Q18, determining whether the fitness value of bacterium i at the new position has changed, and if so, executing step Q19, and if not, making j equal to N_SAnd jumps to execute step Q16;

step Q19, updating the fitness value of the bacterium i;

step Q110, the bacterial population continues to swim in the overturning direction;

step Q111, jumping to execute step Q15, and continuing to circulate until the value of i in step Q11 is equal to S;

step Q112, the chemotaxis operation is finished;

step 706, entering a replication cycle, and performing replication operation, wherein the method specifically comprises the following steps:

against bacterial flora X₁Each bacterium was replicated according to the following replication operations of step F11 to step F16:

step F11, reassigning the bacteria i to i +1, judging whether the scale of the bacteria i is smaller than the scale S of the bacteria, executing the step F12 when the scale of the bacteria i is smaller than the scale S of the bacteria, and executing the step F16 when the scale of the bacteria i is not smaller than the scale S of the bacteria;

step F12, calculating the sum of the fitness of all positions passed by the bacteria in the last replication operation cycle, and defining the sum as a health value;

step F13, sequencing the bacteria according to the quality of the health value;

f14, jumping to execute the step F11;

step F15, eliminating the poor health

step F16, the copying operation is finished;

against bacterial flora X₂Each bacterium was replicated according to the following replication operations of step F21 to step F24:

step F21, calculating the fitness values of all bacteria, sequencing the bacteria in a sequence from small to large, and selecting the currently optimal bacteria as elite bacteria;

step F22, carrying out treatment on the currently best half of bacteria according to the formula X'₂(i)＝X₂(i) + N (0,1) is mutated to generate

step F23, performing cross operation on the worst half of the bacteria according to golden section ratio and the bacteria sorted in the first 61.8 percent and the elite bacteria selected in the step F21 to generate

Step F24, obtaining from daughter bacterial flora X'₂Fungus group X₂Selecting the first S bacteria with the best fitness value to replace the original bacteria group X₂；

Step 707, entering a learning cycle to perform a learning operation, specifically comprising: bacterial group X₁With the bacterium group X₂The bacteria in (1) are sequenced, and the flora X is₁The first 61.8% of the bacteria were selected to be 0.382S bacteria and group X according to roulette' S method₂Middle rowExchanging the last 38.2% of bacteria, wherein the exchanged 0.382S bacteria constitute a new flora X₂；

Step 708, judging whether the cycle times of the chemotaxis cycle, the replication cycle and the learning cycle reach a set value, when the cycle times of the chemotaxis cycle, the replication cycle and the learning cycle reach the set value, finishing the cycle, comparing the optimal bacteria found in the two floras through a fitness value, selecting the best bacteria as a global optimal solution, and outputting the result, otherwise, continuously and circularly executing the steps 705-708 until the cycle times of the chemotaxis cycle, the replication cycle and the learning cycle reach the set value;

step eight, outputting the control voltage U optimized for the heat source circulating pump (2-1), the primary heat supply network circulating pump (2-2) and the secondary heat supply network circulating pump (2-3) by an output layer in the PID neural network^*And driving the heat source circulating pump (2-1), the primary heat supply network circulating pump (2-2) and the secondary heat supply network circulating pump (2-3).

9. A hot dry rock geothermal mining system implementing the method of claim 1, wherein: the system comprises a hot dry rock geothermal exploitation system and a hot dry rock geothermal utilization system, wherein the hot dry rock geothermal exploitation system comprises a fluid transmission and distribution system, an underground heat exchange system and an underground monitoring control system, and the fluid transmission and distribution system comprises a heat source side water supply main pipe (1-6), a heat source side water return main pipe (1-7), a heat source circulating pump (2-1), a main well (5-1) and a liquid distribution box (6); the underground heat exchange system comprises a supporting plate (3), an underground rock stratum heat exchange tube (4) and a plurality of auxiliary wells; the underground monitoring control system comprises temperature sensors (4-8), vacuum degree sensors (4-9), flow velocity sensors (4-10), temperature sensor data lines, vacuum degree sensor data lines, flow velocity sensor data lines, data transmission lines (2-9), monitoring discs (4-14), vacuumizing valves (6-20), underground rock stratum heat exchange tubes (4), signal line cavities (6-12), a liquid distribution box (6), data line collecting holes (6-16), data line collecting tubes (4-7), data acquisition modules (6-17), data monitoring modules (6-18) and a computer (4-15).

10. The hot dry rock geothermal mining system according to claim 9, wherein: a heat-insulating cement sleeve is arranged in the main well (5-1), a heat-conducting cement sleeve is arranged in the auxiliary well (5-2), and a heat-conducting agent is coated in a gap between the heat-conducting cement sleeve and the dry-hot rock stratum (4-11); the supporting plate (3) comprises an L-L end plate (3-1) and an M-M end plate (3-2), an X-shaped rib plate (3-3) is arranged on the L-L end plate (3-1), and the M-M end plate (3-2) is a movable end plate; the lower part of the M-M end plate (3-2) is provided with a guide plate made of elastic material, and the L-L end plate (3-1) and the M-M end plate (3-2) are symmetrically provided with reserved holes (3-6) for the underground rock stratum heat exchange tubes (4) to pass through; the number of the guide plates is two, and the guide plates are respectively a 45-degree guide plate (3-4) and a 135-degree guide plate (3-5); the underground rock stratum heat exchange tube (4) comprises a concentric sleeve (4-1), a heat exchange packaging sleeve (4-3) and a monitoring disc (4-14), the tail end of the concentric sleeve (4-1) is closed, a high-temperature phase change heat storage material (4-2) is filled in an interlayer of the concentric sleeve (4-1), the heat exchange packaging sleeve (4-3) is fixed in the inner cavity of the concentric sleeve (4-1), the heat exchange packaging sleeve (4-3) is provided with a liquid injection pipe (4-5) and a liquid return cavity (4-6) which are symmetrically arranged, the interlayer of the heat exchange packaging sleeve (4-3) is filled with a low-temperature phase change heat storage material (4-4), the heat exchange packaging sleeve (4-3) is provided with symmetrically arranged data line collecting pipes (4-7); the liquid distribution box (6) comprises a shell (6-1), an A-A end plate (6-2), a C-C end plate (6-3), an E-E end plate (6-4) and a G-G end plate (6-5), a closed area formed by the A-A end plate (6-2), the C-C end plate (6-3) and the shell (6-1) in an enclosing mode forms a liquid collection cavity, a closed area formed by the C-C end plate (6-3), the E-E end plate (6-4) and the shell (6-1) in an enclosing mode forms a signal line cavity (6-12), a closed area formed by the E-E end plate (6-4), the G-G end plate (6-5) and the shell (6-1) in an enclosing mode forms a liquid distribution cavity, and a plurality of liquid distribution holes (6-9) distributed symmetrically are formed in the A-A end plate (6-2) in a grouping mode ) The liquid return holes (6-15) and the data line wire collecting holes (6-16) are formed in the C-C end plate (6-3), the liquid return collecting holes (6-10) and a plurality of groups of symmetrically distributed liquid separating holes (6-9) and the data line wire collecting holes (6-16) are formed in the C-C end plate (6-3), the E-E end plate (6-4) is provided with the liquid return collecting holes (6-10) and a plurality of groups of symmetrically distributed liquid separating holes (6-9), the G-G end plate (6-5) is provided with a group of symmetrically distributed liquid injection collecting holes (6-19) and liquid return collecting holes (6-10), and the liquid distributing pipes (6-8) are connected with the liquid distributing holes (6-9) in the E-E end plate (6-4) through the liquid distributing holes (6-9) in the A-A end plate (6-2), the liquid return collecting pipe (6-7) is connected with a liquid return collecting hole (6-10) on the C-C end plate (6-3) and a liquid return collecting hole (6-10) on the G-G end plate (6-5), the bottom of the A-A end plate (6-2) is provided with an X-shaped slotted hole (6-14), a vacuum pumping valve (6-20) and a vacuum degree sensor 4-9 are arranged in a signal line cavity (6-12) of the liquid distribution box (6), and the liquid return collecting pipe (6-7) and the liquid injection collecting pipe (6-6) of the liquid distribution box (6) are internally provided with a temperature sensor (4-8) and a flow velocity sensor (4-10); the overground heat exchange system side pipeline comprises a primary heat supply network water supply pipe (1-1), a primary heat supply network water return pipe (1-2), a primary heat supply network bypass pipe (1-3), a secondary heat supply network water supply pipe (1-4), a secondary heat supply network water return pipe (1-5), a load side water supply pipe (1-8) and a load side water return pipe (1-9); the overground heat exchange system side pipeline data acquisition and monitoring system comprises: the system comprises a heat source circulating pump (2-1), a primary heat supply network circulating pump (2-2), a secondary heat supply network circulating pump (2-3), a differential pressure sensor, a temperature difference sensor, a control actuator (2-7), a data transmission line (2-9), a pressure sensor data line, a temperature sensor data line, a variable frequency regulator, a data acquisition module (6-1), a data monitoring module (6-18) and a computer (4-15).

Technical Field

The invention belongs to the field of geothermal resource exploitation and clean energy utilization, and particularly relates to a method and a system for exploitation and utilization of geothermal energy of hot dry rock.

Background

The economic construction of China is rapidly developed, and the demand on energy is rapidly increased. The coal reserves in China are relatively rich, but a large amount of pollution is generated in the mining and utilizing process, so that the ecological environment is seriously influenced, and meanwhile, the petroleum resources in China are deficient and the dependence degree on the environment is high, so that the potential risk is brought to the national energy safety. The development and utilization of clean renewable energy sources are important measures for changing the energy development mode and adjusting the energy structure.

Geothermal resources, as a very competitive clean renewable energy source, have become a new topic of active experimental research in the world due to their renewable, pollution-free and abundant reserves.

Geothermal resources, as a very competitive clean renewable energy source, have become a new topic of active experimental research in the world due to their renewable, pollution-free and abundant reserves.

The geothermal energy is divided into shallow geothermal energy, hydrothermal geothermal resources and dry hot rock geothermal resources according to the buried depth. The ground source heat pump heat supply technology utilizing shallow geothermal energy has developed in China for nearly 20 years, but the ground source heat pump heat supply technology still faces various problems and limitations in popularization and application, and the dry hot rock heat supply technology with great development potential is in the initial development stage. At present, a plurality of technical problems exist in the development of the dry and hot rock, no mature theoretical technology can be used for reference at abroad, a multidisciplinary joint attack is urgently needed, and the key technology in the development of the dry and hot rock is deeply researched. Including fracturing and artificial storage techniques, heat exchange and heat energy extraction techniques. The fracturing and manual storage project mainly researches the directions of crack and extension control, later-stage temperature change characteristic and crack network change prediction, vertical crack fracturing design, crack distribution monitoring and the like. Three technical requirements of heat extraction and heat system service life, fluid extraction temperature and efficiency guarantee, energy consumption reduction and cyclic loss need to be met, but the problems of low artificial underground heat storage geothermal extraction efficiency and high heat exchange fluid loss rate exist in the existing hot dry rock geothermal mining technology, technical indexes such as heat extraction and heat system service life, fluid extraction temperature and efficiency, energy consumption and cyclic loss are not met, and a large amount of tests and investigation work still needs to be carried out.

In 5 months of 2015, designing a deep dry hot rock resource exploration well with the depth of 4000 meters to drill in a clear spring forest farm in Zhangzhou city of Fujian, which is the first deep dry hot rock resource exploration well in China implemented by the geological survey bureau in China. In 9 months of 2017, exploration personnel drill a high-temperature dry and hot rock mass at 236 ℃ in 3705 meters deep in the Qinghai-Harmony basin, which is the dry and hot rock mass which is drilled and buried shallowest and has the highest temperature for the first time in China, and the major breakthrough of China in dry and hot rock exploration is realized. In 2018, in 5 months, the first dry hot rock parameter well in the east of China is well drilled. The research meeting of dry hot rock selection, exploration and development academy, which is held by multiple units such as China geological university and national geothermal energy center, reveals that after 66 days of drilling, the first dry hot rock parameter well in the eastern part of China is drilled completely in the northeast of Qiongei, and the drilling well drills the dry hot rock with the temperature of more than 185 ℃ in the depth of 4387 meters, which indicates that the dry hot rock exists in the eastern part of China coastal region, and has milestone significance for the development and utilization of the dry hot rock geothermal energy in China.

The traditional central heating mode in northern China adopts hot water or steam generated by a central heat source as a heating medium, and supplies heat to production, heating and living heat users in a town or a larger area through a heat supply network. The centralized heating in cities and towns is characterized by large investment, large boiler, large chimney and large centralized mode of large pipe network. The method has the advantages of causing a series of problems of huge construction investment, low energy-saving and emission-reducing level, overlong pipe network, serious loss, inflexible heat supply regulation, standard and many-cause toll and the like. At present, the drilling technology of the dry heat rock is broken through, but the uncontrollable property of the underground heat storage construction technology is high. The heat exchange fluid leakage in the artificial heat reservoir is serious on one hand, and the seepage channel resistance of the heat exchange fluid in the artificial heat reservoir is large on the other hand.

Aiming at the problems, a method and a system for taking hot dry rock are provided by combining the current technical development situation. The artificial heat storage is constructed by drilling, heat is efficiently taken from a dry-hot rock layer through an underground rock layer heat exchange tube, and stable and reliable heat supply all the year round is realized by combining a novel overground heat exchange system.

Disclosure of Invention

The invention aims to solve the technical problem of providing a dry hot rock geothermal exploitation method aiming at the defects in the prior art, which is a dry hot rock geothermal exploitation method for utilizing an artificial drilling technology to extract heat through heat exchange fluid in an underground rock heat exchange pipe; the traditional centralized heating technology in China has a series of problems of large construction investment, low energy-saving level, long pipe network, serious loss, inflexible heating regulation, many standard and many defects in charging and the like, and provides a dry hot rock geothermal utilization method for realizing novel distributed heating. The hot dry rock geothermal exploitation method and the hot dry rock geothermal utilization method are combined to comprehensively obtain the hot dry rock geothermal exploitation method.

In order to solve the technical problem, the technical scheme adopted by the invention is as follows: the geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps:

firstly, carrying out geothermal energy detection, drilling a main well, drilling an annular slotted hole at the bottom of the main well, and drilling a plurality of auxiliary wells uniformly distributed around the main well at the bottom of the main well;

hoisting and fixing a support plate for fixedly supporting the well mouths of the multiple auxiliary wells into an annular groove hole at the bottom of the main well;

step three, preparing an underground rock stratum heat exchange tube;

step four, connecting the liquid distribution box and the underground rock stratum heat exchange tube;

step five, simultaneously putting a plurality of groups of underground rock stratum heat exchange tubes into the main well, ensuring that the sections of the corresponding positions of the underground rock stratum heat exchange tubes are positioned at the same horizontal plane position through a horizontal detector, and ensuring that the sections of the corresponding positions of the underground rock stratum heat exchange tubes smoothly pass through the supporting plates to enter the auxiliary wells; when the underground rock stratum heat exchange tube advances to the tail end of the auxiliary well, the liquid distribution box accurately falls on the set position on the supporting plate, and the liquid distribution box is lowered into the well and fixed;

sixthly, putting the heat source side water supply main pipe and the heat source side water return main pipe into the main well and reaching the position of the liquid distribution box;

connecting a heat source side water supply main pipe and a heat source side water return main pipe with a heat source side interface of the lotus root removing tank, and connecting a primary heat supply network water supply pipe and a primary heat supply network water return pipe with a heat supply network side interface of the lotus root removing tank;

step eight, connecting a secondary heat supply network water supply pipe on a reserved interface of the primary heat supply network water supply pipe, connecting a secondary heat supply network water return pipe on a reserved interface of the primary heat supply network water return pipe, and connecting the secondary heat supply network water supply pipe and the secondary heat supply network water return pipe with a heat exchange station heat supply network side interface;

step nine, connecting a load side water supply pipe and a load side water return pipe with a load side interface of the heat exchange station;

tenth, connecting the heat source side pipeline data acquisition and monitoring circuit;

eleven, connecting the data acquisition and monitoring circuit of the pipeline at the side of the overground heat exchange system;

step twelve, cold heat exchange fluid enters the main well from the heat source side water supply main pipe and enters the underground rock heat exchange pipe through the liquid distribution box, the cold heat exchange fluid absorbs heat of the underground rock after passing through the underground heat exchange system, the temperature is increased to form heat exchange fluid, and the heat exchange fluid enters the heat source side water return main pipe from the underground rock heat exchange pipe and the liquid distribution box; the heat exchange fluid enters a side pipeline of the ground heat exchange system from the decoupling tank, and finally heat energy is used by a terminal user; cold heat exchange fluid enters the underground rock stratum heat exchange tube from the fluid distribution box to carry out primary heating; when the heat exchange fluid after primary heating reaches the tail end of the heat exchange tube of the underground rock stratum, the heat exchange fluid reversely flows towards the direction of the liquid distribution box, exchanges heat in the heat exchange tube of the underground rock stratum and carries out secondary heating; and in the running process of the underground heat exchange system, the underground data acquisition and monitoring system is used for monitoring and controlling related parameters of the underground heat exchange system.

The geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps: a heat-insulating cement sleeve is arranged in the main well, a heat-conducting cement sleeve is arranged in the auxiliary well, and a heat-conducting agent is coated in a gap between the heat-conducting cement sleeve and the dry-hot rock stratum; an infrared irradiation instrument is arranged in an annular groove hole at the bottom of the main well, and an infrared signal receiver for receiving an infrared signal emitted by the infrared irradiation instrument is arranged on the M-M end plate; the supporting plate comprises an L-L end plate and an M-M end plate, an X-shaped rib plate is arranged on the L-L end plate, and the M-M end plate is a movable end plate; the lower part of the M-M end plate is provided with a guide plate made of elastic material, and the L-L end plate and the M-M end plate are symmetrically provided with reserved holes for the underground rock stratum heat exchange tubes to pass through.

The geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps: the number of the guide plates is two, and the guide plates are respectively a 45-degree guide plate and a 135-degree guide plate;

and fifthly, in the process that the underground rock stratum heat exchange tube enters each auxiliary well, adjusting the speed of the underground rock stratum heat exchange tube going into the well according to the stress deformation characteristics of the 45-degree guide plate and the 135-degree guide plate, so that the 45-degree guide plate and the 135-degree guide plate generate elastic deformation at an angle of 45 degrees.

The geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps: the underground rock stratum heat exchange tube includes concentric sleeve pipe, heat transfer encapsulation sleeve pipe and monitoring panel, concentric sheathed tube end is sealed, be filled with high temperature phase change heat storage material in the concentric sleeve pipe intermediate layer, heat transfer encapsulation sleeve pipe is fixed in concentric sleeve pipe inner chamber, be provided with symmetrical arrangement's notes liquid pipe and liquid return chamber on the heat transfer encapsulation sleeve pipe, it has low temperature phase change heat storage material to fill in the heat transfer encapsulation sleeve pipe intermediate layer, be provided with symmetrical arrangement's data line collecting pipe on the heat transfer encapsulation sleeve pipe.

The three concrete processes for preparing the underground rock stratum heat exchange tube are as follows:

301, filling a solid-phase high-temperature phase change heat storage material in the concentric sleeve interlayer;

302, fastening a heat exchange packaging sleeve in an inner cavity of the concentric sleeve;

step 303, filling a solid-phase low-temperature phase change heat storage material into the interlayer of the heat exchange packaging sleeve;

step 304, fixing a monitoring disc at the tail end of the underground rock stratum heat exchange tube;

305, mounting a temperature sensor, a vacuum degree sensor and a flow velocity sensor at corresponding positions of a monitoring disc;

step 306, connecting the temperature sensor data line, the vacuum degree sensor data line and the flow velocity sensor data line with the temperature sensor, the vacuum degree sensor and the flow velocity sensor through reserved pore passages of the monitoring disc respectively, and then summarizing the data lines into a data line collecting pipe in the heat exchange packaging sleeve;

307, determining the lengths of underground rock stratum heat exchange tubes in a plurality of auxiliary wells according to the measured lengths of the auxiliary wells drilled;

308, repeating the steps 301 to 307 until the preparation of the underground rock stratum heat exchange tube is completed.

The geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps: the liquid distribution box comprises a shell, an A-A end plate, a C-C end plate, an E-E end plate and a G-G end plate, wherein a liquid collection cavity is formed by a closed region defined by the A-A end plate, the C-C end plate and the shell, a signal line cavity is formed by a closed region defined by the C-C end plate, the E-E end plate and the shell, a liquid distribution cavity is formed by a closed region defined by the E-E end plate, the G-G end plate and the shell, a plurality of groups of symmetrically distributed liquid distribution holes, liquid return holes and data line concentrated holes are formed in the A-A end plate, a plurality of groups of symmetrically distributed liquid distribution holes, a plurality of groups of symmetrically distributed liquid return holes and data line concentrated holes are formed in the C-C end plate, a group of symmetrically distributed liquid return holes and a plurality of groups of symmetrically distributed liquid distribution holes are formed in the E-E end plate, a group of symmetrically distributed liquid return holes and liquid return holes are formed in the G-G end plate, the liquid separating pipe is connected with the liquid separating hole in the E-E end plate through the liquid separating hole in the A-A end plate, the liquid return collecting pipe is connected with the liquid return collecting hole in the G-G end plate through the liquid return collecting hole in the C-C end plate, the bottom of the A-A end plate is provided with an X-shaped slotted hole, a vacuum pumping valve and a vacuum degree sensor are arranged in a signal line cavity of the liquid distribution box, and a temperature sensor and a flow velocity sensor are arranged in the liquid return collecting pipe and the liquid injection collecting pipe of the liquid distribution box;

when the liquid distribution box is connected with the underground rock stratum heat exchange tube in the fourth step, the liquid distribution hole, the liquid return hole and the data line concentration hole in the A-A end plate of the liquid distribution box are respectively connected with the liquid injection tube, the liquid return cavity and the data line concentration tube in the heat exchange packaging sleeve;

when the liquid distribution box accurately falls on the set position on the supporting plate in the step five, the X-shaped rib plate on the L-L end plate is matched with the X-shaped slotted hole at the bottom of the A-A end plate;

putting the heat source side water supply main pipe and the heat source side water return main pipe into the main well and reaching the position of the liquid distribution box, namely the position of the G-G end plate of the liquid distribution box, and respectively connecting the heat source side water supply main pipe and the heat source side water return main pipe with a liquid injection header and a liquid return header on the G-G end plate of the liquid distribution box;

when the cold heat exchange fluid enters the underground rock stratum heat exchange tube through the liquid distribution box in the twelfth step, the cold heat exchange fluid firstly enters the liquid distribution cavity through the liquid injection collecting holes in the G-G end plate of the liquid distribution box; the cold heat exchange fluid enters the liquid separating pipe from the liquid separating holes symmetrically distributed on the E-E end plate and enters the liquid injecting pipe in the underground rock stratum heat exchange pipe through the liquid separating holes symmetrically distributed on the A-A end plate;

the specific process that the heat exchange fluid enters the heat source side water return main pipe from the underground rock stratum heat exchange pipe and the liquid distribution box in the step twelve is as follows: the heat exchange fluid enters the liquid collecting cavity from liquid returning cavities symmetrically distributed in the underground rock stratum heat exchange tube through liquid returning holes in the G-G end plate; the heat exchange fluid enters the liquid return header from the liquid return collecting holes on the C-C end plate and enters the heat source side water return header pipe through the liquid return collecting holes on the G-G end plate;

and a step twelve, the cold heat exchange fluid enters the underground rock stratum heat exchange tube from the liquid distribution box, and the specific process of primary heating is as follows: the cold heat exchange fluid enters each liquid injection pipe in a plurality of groups of underground rock stratum heat exchange pipes from liquid separation holes symmetrically distributed on an A-A end plate of the liquid distribution box and flows towards the tail end of each group of underground rock stratum heat exchange pipes along the liquid injection pipes, and the cold heat exchange fluid absorbs heat of the heat exchange fluid in the liquid cavity in the liquid injection pipes to carry out primary heating;

and step twelve, when the heat exchange fluid after primary heating reaches the tail end of the heat exchange tube of the underground rock stratum, reversely flows towards the liquid distribution box, exchanges heat in the heat exchange tube of the underground rock stratum, and the specific process of secondary heating is as follows: the heat exchange fluid heated in the first stage reversely flows into each liquid return cavity and flows towards the liquid distribution box along the liquid return cavities, the inner wall of the concentric sleeve exchanges heat with the high-temperature phase-change heat storage material, the high-temperature phase-change heat storage material exchanges heat with the dry heat rock stratum through the outer wall of the concentric sleeve, the heat exchange fluid indirectly obtains heat from the dry heat rock, and meanwhile the heat exchange fluid heated in the first stage exchanges heat with the low-temperature phase-change heat storage material in the liquid return cavities; when the heat exchange fluid reaches the A-A end plate of the liquid distribution box, the heat exchange fluid flows into the liquid return holes symmetrically distributed on the A-A end plate.

The geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps: the underground data acquisition and monitoring system comprises a temperature sensor, a vacuum degree sensor, a flow velocity sensor, a temperature sensor data line, a vacuum degree sensor data line, a flow velocity sensor data line, a data line collecting pipe, a signal line cavity, a data transmission line, a monitoring disc, a data acquisition module, a data monitoring module and a computer;

the specific process of performing the connection of the heat source side pipeline data acquisition and the monitoring circuit in the step ten is as follows:

step 1001, installing the temperature sensor, the vacuum degree sensor and the flow velocity sensor at corresponding positions of a monitoring disc;

step 1002, connecting a temperature sensor data line, a vacuum degree sensor data line and a flow velocity sensor data line with the temperature sensor, the vacuum degree sensor and the flow velocity sensor through reserved pore passages of a monitoring disc respectively, and then summarizing the data lines into a data line collecting pipe in the heat exchange packaging sleeve;

step 1003, the data line collecting pipes are communicated with signal line cavities through data line collecting holes in an A-A end plate of the liquid distribution box, data transmission lines in a plurality of groups of underground rock layer heat exchange tubes are collected into groups in the signal line cavities, and the data line collecting pipes are connected to a data acquisition module and a data monitoring module on the ground through the data line collecting pipes respectively arranged in a heat source side water supply main pipe heat insulation layer and a heat source side water return main pipe heat insulation layer;

step 1004, the data acquisition module and the data monitoring module are connected to a computer through a data transmission line;

in the running process of the underground heat exchange system in the twelfth step, the specific process that the underground data acquisition and monitoring system is used for monitoring and controlling the related parameters of the underground heat exchange system is as follows: the flow velocity sensor, the temperature sensor and the vacuum degree sensor are arranged on the monitoring disc, and are used for measuring the flow velocity, the temperature and the vacuum degree of the heat exchange fluid at intervals of a certain time; the data transmission line transmits the measured signal to the data acquisition module and the data monitoring module; the data acquisition module and the data monitoring module are used for connecting and displaying the flow velocity signal of the heat exchange fluid at each measuring point, the temperature signal of the heat exchange fluid at each measuring point, the vacuum cavity degree signal at each measuring point and the like on a computer so as to monitor and control related parameters of the underground heat exchange system.

The geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps: the overground heat exchange system side pipeline comprises a primary heat supply network water supply pipe, a primary heat supply network water return pipe, a primary heat supply network bypass pipe, a secondary heat supply network water supply pipe, a secondary heat supply network water return pipe, a load side water supply pipe and a load side water return pipe;

the overground heat exchange system side pipeline data acquisition and monitoring system comprises: the system comprises a heat source circulating pump, a primary heat supply network circulating pump, a secondary heat supply network circulating pump, a differential pressure sensor, a temperature difference sensor, a control actuator, a data transmission line, a pressure sensor data line, a temperature sensor data line, a variable frequency regulator, a data acquisition module, a data monitoring module and a computer;

step eleven, the specific process of performing the connection of the overground heat exchange system side pipeline data acquisition and monitoring circuit is as follows:

step 1101, additionally arranging a variable frequency regulator on the circulating water pump, wherein the variable frequency regulator is connected to a control actuator through a data transmission line;

step 1102, a temperature sensor is arranged on a water supply pipe of a system where the circulating water pump is located, one end of a data line of the temperature sensor is connected to the temperature sensor, and the other end of the data line of the temperature sensor is connected to a control actuator;

step 1103, mounting a temperature sensor on a water return pipe of a system where the circulating water pump is located, wherein one end of a data line of the temperature sensor is connected to the temperature sensor, and the other end of the data line of the temperature sensor is connected to a control actuator;

1104, repeating 1101, 1102 and 1103, and sequentially connecting a heat source circulating pump, a primary heat supply network circulating pump and a secondary heat supply network circulating pump to the data acquisition and monitoring system;

step 1105, installing a flow switch on the primary heat supply network bypass pipe, wherein the flow switch is connected with a control actuator through a data transmission line;

step 1106, installing a pressure sensor on a primary heat supply network water supply pipe, wherein one end of a pressure sensor data line is connected to the pressure sensor, and the other end of the pressure sensor data line is connected to a control actuator;

step 110, installing a pressure sensor on a primary heat supply network water return pipe, wherein one end of a data line of the pressure sensor is connected to the pressure sensor, and the other end of the data line of the pressure sensor is connected to a control actuator;

step 1108, connecting the control actuators to a data acquisition module and a data monitoring module respectively through data transmission lines;

and step 1109, connecting the data acquisition module and the data monitoring module with a computer through a data transmission line.

The geothermal exploitation and utilization method of the hot dry rock is characterized by comprising the following steps: in the above-ground monitoring control system, the heat source circulating pump, the primary heat supply network circulating pump and the secondary heat supply network circulating pump run in a variable flow mode, a water supply and return temperature difference control mode is adopted in the variable flow regulation mode, the water supply and return temperature difference of a circulating pipeline where the water pump is located is constant, the rotating speed is adjusted according to the change of the temperature difference, an optimized fuzzy neural network PID control method is adopted in the control method, and the specific process is as follows:

the method comprises the following steps that firstly, a controller periodically samples the temperature difference of supply water and return water;

step two, the controller is according to the formula

The temperature difference of the supply water and the return water obtained by sampling the ith timeTemperature difference between the water supply and the return water

Making a difference to obtain a deviation e_i；

Step two, the controller is according to the formulaFor deviation e_iDerivative to obtain a deviation e_iRate of change over time t

Step three, the controller will e_iAnd

two nodes as input layers in the fuzzy neural network;

step four, the controller will e_iAnddividing fuzzy subsets, determining the number of nodes of a fuzzy layer in a fuzzy neural network, wherein a Gaussian function is adopted as a membership function;

step five, the controller determines the number of nodes of a fuzzy rule layer in the fuzzy neural network;

step six, the controller resolves the ambiguity of the de-ambiguity layer in the fuzzy neural network by adopting a gravity center method to form a node which is used as a node of a PID input layer in the PID neural network;

step seven, the controller enables K_P、K_I、K_DAs three nodes of a PID layer in the PID neural network, the weight of the PID neural network is optimized by adopting an improved bacterial foraging optimization algorithm, so that the K of a static parameter_P、K_I、K_DConverting into a dynamic adjustment form;

the specific process of optimizing the weight of the PID neural network by adopting the improved bacterial foraging optimization algorithm is as follows:

step 701, initializing bacterial foraging optimization algorithm parameters: the bacterial foraging optimization algorithm parameters comprise a search working dimension p of the weight of the total number S, PID of bacteria corresponding to the weight of the PID neural network in the bacterial flora, and chemotaxis times of the weight of the PID neural networkNumber N_cMaximum step number N of weight one-way motion of PID neural network in chemotaxis process_SAnd the copy number N of the weight of the PID neural network_reAnd the learning times N of the weight of the PID neural network_edMaximum chemotaxis step length C of weight of PID neural network_maxAnd minimum chemotaxis step length C of weight of PID neural network_min；

Step 702, initializing the flora position: by means of random initialization and according to the formula X ═ X_min+rand×(X_max-X_min) Initializing 2S points in p-dimensional space as initialization positions of bacteria, wherein S bacteria are randomly selected as flora X₁The remaining S bacteria are used as flora X₂；X_minFor optimizing the minimum value of the interval, X_maxFor the maximum value of the optimization interval, X is the initialization position of the bacteria, and rand is uniformly distributed in [0,1 ]]A random number between the regions;

step 703, updating the fitness value: according to the formula

Calculating the fitness value of each bacterium; wherein d is_attractDepth of attraction between bacteria, w_attractWidth of attraction between bacteria, h_repellenHeight of repulsion between bacteria, w_repellenThe width of the repulsion between bacteria, P (i, J, k, l) is the position of the bacteria i after the jth tropism operation, the kth replication operation and the ith migration operation, P (1: S, J, k, l) is a random position in the neighborhood of the current individual P (i, J, k, l), J (1: S, J, k, l)_CC(i, j, k, l) is the fitness value of the bacterium i after the jth tropism operation, the kth replication operation and the l migration operation;

step 704, setting parameters of the circulation variables: wherein the chemotaxis cycle number j is 1 to N_cThe number of reproduction cycles k is 1 to N_reLearning cycle times l is 1-N_ed；

Step 705, entering a chemotaxis cycle to perform chemotaxis operation, wherein the specific method comprises the following steps:

against bacterial flora X₂According to whichThe chemotaxis operation of the following step Q21 to step Q211 chemotaxis each bacterium:

step Q21, reassigning the bacteria i to i +1, judging whether the scale of the bacteria i is smaller than the scale S of the bacteria, executing step Q22 when the scale of the bacteria i is smaller than the scale S of the bacteria, and executing step Q212 when the scale of the bacteria i is not smaller than the scale S of the bacteria;

step Q22, calculating the fitness value of the bacterium i;

step Q23, bacteria i are turned one unit step in the randomly generated direction;

step Q24, initializing j to 1;

step Q25, calculating the fitness value of the bacteria i at the new position;

step Q26, judge if j is less than the maximum step number N_cWhen less than, executing the step Q2, and when not less than, jumping to execute the step Q21;

step Q2, reassigning j to j + 1;

step Q28, determining whether the fitness value of bacterium i at the new position has changed, and if so, executing step Q29, and if not, making j equal to N_SAnd jumps to execute step Q26;

step Q29, updating the fitness value of the bacterium i;

step Q210, the bacterial population continues to swim in the overturning direction;

step Q211, jumping to execute step Q25, and continuing to circulate until the value of i in step Q21 is equal to S;

step Q212, the chemotaxis operation is finished;

against bacterial flora X₁Chemotaxis of each bacterium was performed according to the following chemotaxis operation of step Q11 to step Q112:

step Q11, reassigning the bacteria i to i +1, judging whether the scale of the bacteria i is smaller than the bacterial colony scale S, executing a step Q12 when the scale of the bacteria i is smaller than the bacterial colony scale S, and executing a step Q112 when the scale of the bacteria i is not smaller than the bacterial colony scale S;

step Q12, calculating the fitness value of the bacterium i;

step Q13, according to the formula

Calculating a bacterial flora density function factor D (i), and calculating a chemotaxis step length C (i) according to a formula C (i) ═ A.D (i) + B; then turning bacterium i by step length C (i) in the direction of random generation; wherein L is the maximum length in the diagonal line of the search space, X (m, i) is the coordinate value of the position of the m-th dimension of the bacterium i in the search space,

the average position coordinate value of all bacteria in the current search space in the mth dimension of the search space is obtained;

step Q14, initializing j to 1;

step Q15, calculating the fitness value of the bacteria i at the new position;

step Q16, judge if j is less than the maximum step number N_cWhen less than, executing the step Q1, and when not less than, jumping to execute the step Q11;

step Q1, reassigning j to j + 1;

step Q18, determining whether the fitness value of bacterium i at the new position has changed, and if so, executing step Q19, and if not, making j equal to N_SAnd jumps to execute step Q16;

step Q19, updating the fitness value of the bacterium i;

step Q110, the bacterial population continues to swim in the overturning direction;

step Q111, jumping to execute step Q15, and continuing to circulate until the value of i in step Q11 is equal to S;

step Q112, the chemotaxis operation is finished;

step 706, entering a replication cycle, and performing replication operation, wherein the method specifically comprises the following steps:

against bacterial flora X₁Each bacterium was replicated according to the following replication operations of step F11 to step F16:

step F11, reassigning the bacteria i to i +1, judging whether the scale of the bacteria i is smaller than the scale S of the bacteria, executing the step F12 when the scale of the bacteria i is smaller than the scale S of the bacteria, and executing the step F16 when the scale of the bacteria i is not smaller than the scale S of the bacteria;

step F12, calculating the sum of the fitness of all positions passed by the bacteria in the last replication operation cycle, and defining the sum as a health value;

step F13, sequencing the bacteria according to the quality of the health value;

f14, jumping to execute the step F11;

step F15, eliminating the poor health

Bacteria, the restEach bacterium divides a new individual which is completely the same as the bacterium itself;

step F16, the copying operation is finished;

against bacterial flora X₂Each bacterium was replicated according to the following replication operations of step F21 to step F24:

step F21, calculating the fitness values of all bacteria, sequencing the bacteria in a sequence from small to large, and selecting the currently optimal bacteria as elite bacteria;

step F22, carrying out treatment on the currently best half of bacteria according to the formula X'₂(i)＝X₂(i) + N (0,1) is mutated to generateThe new bacteria and the original bacteria form a new daughter bacterial flora X'₂(ii) a Wherein N (0,1) is a Gaussian distribution with a mean value of 0 and a mean square error of 1;

step F23, performing cross operation on the worst half of the bacteria according to golden section ratio and the bacteria sorted in the first 61.8 percent and the elite bacteria selected in the step F21 to generate

The new bacteria and the original bacteria form a new daughter bacterial flora X₂；

Step F24, obtaining from daughter bacterial flora X'₂Fungus group X₂Selecting the first S bacteria with the best adaptability value to replace the original bacteria group X₂；

Step 707, entering a learning cycle to perform a learning operation, specifically comprising: bacterial group X₁With the bacterium group X₂The bacteria in (1) are sequenced, and the flora X is₁The first 61.8% of the bacteria were selected to obtain 0.382S bacteria and group X according to roulette' S method₂The second 38.2% of the bacteria are exchanged, and the exchanged 0.382S bacteria form a new flora X₂；

Step 708, judging whether the cycle times of the chemotaxis cycle, the replication cycle and the learning cycle reach a set value, when the cycle times of the chemotaxis cycle, the replication cycle and the learning cycle reach the set value, finishing the cycle, comparing the optimal bacteria found in the two floras through a fitness value, selecting the best bacteria as a global optimal solution, and outputting the result, otherwise, continuously and circularly executing the steps 705-708 until the cycle times of the chemotaxis cycle, the replication cycle and the learning cycle reach the set value;

step eight, outputting the control voltage U after optimizing the heat source circulating pump, the primary heat supply network circulating pump and the secondary heat supply network circulating pump by an output layer in the PID neural network^*And driving the heat source circulating pump, the primary heat supply network circulating pump and the secondary heat supply network circulating pump.

The invention also discloses a system for exploiting and utilizing the geothermal heat of the hot dry rock, which has the advantages of reasonable system, simple steps, novel design, convenience and energy conservation, capability of realizing high-efficiency geothermal exploitation and utilization, good energy-saving effect, strong practicability and high popularization and application values, and is characterized in that: the system comprises a hot dry rock geothermal exploitation system and a hot dry rock geothermal utilization system, wherein the hot dry rock geothermal exploitation system comprises a fluid transmission and distribution system, an underground heat exchange system and an underground monitoring and control system, and the fluid transmission and distribution system comprises a heat source side water supply main pipe, a heat source side water return main pipe, a heat source circulating pump, a main well and a liquid distribution box; the underground heat exchange system comprises a supporting plate, an underground rock stratum heat exchange tube and a plurality of auxiliary wells; the underground monitoring control system comprises a temperature sensor, a vacuum degree sensor, a flow velocity sensor, a temperature sensor data line, a vacuum degree sensor data line, a flow velocity sensor data line, a data transmission line, a monitoring disc, a vacuumizing valve, an underground rock stratum heat exchange pipe, a signal line cavity, a liquid distribution box, a data line collecting hole, a data line collecting pipe, a data acquisition module, a data monitoring module and a computer.

The geothermal exploitation and utilization system of the hot dry rock is characterized in that: a heat-insulating cement sleeve is arranged in the main well, a heat-conducting cement sleeve is arranged in the auxiliary well, and a heat-conducting agent is coated in a gap between the heat-conducting cement sleeve and the dry-hot rock stratum; the supporting plate comprises an L-L end plate and an M-M end plate, an X-shaped rib plate is arranged on the L-L end plate, and the M-M end plate is a movable end plate; the lower part of the M-M end plate is provided with a guide plate made of an elastic material, and the L-L end plate and the M-M end plate are symmetrically provided with reserved holes for the underground rock stratum heat exchange tubes to pass through; the number of the guide plates is two, and the guide plates are respectively a 45-degree guide plate and a 135-degree guide plate; the underground rock stratum heat exchange tube comprises a concentric sleeve, a heat exchange packaging sleeve and a monitoring disc, the tail end of the concentric sleeve is closed, a high-temperature phase change heat storage material is filled in an interlayer of the concentric sleeve, the heat exchange packaging sleeve is fixed in an inner cavity of the concentric sleeve, a liquid injection tube and a liquid return cavity which are symmetrically arranged are arranged on the heat exchange packaging sleeve, a low-temperature phase change heat storage material is filled in the interlayer of the heat exchange packaging sleeve, and a data line wire collecting tube which is symmetrically arranged is arranged on the heat exchange packaging sleeve; the liquid distribution box comprises a shell, an A-A end plate, a C-C end plate, an E-E end plate and a G-G end plate, wherein a liquid collection cavity is formed by a closed region enclosed by the A-A end plate, the C-C end plate and the shell, a signal line cavity is formed by a closed region enclosed by the C-C end plate, the E-E end plate, the G-G end plate and the shell, a liquid separation cavity is formed by the closed region enclosed by the E-A end plate, the A-A end plate is provided with a plurality of groups of symmetrically distributed liquid separation holes, liquid return holes and data line wire collection holes, the C-C end plate is provided with liquid return holes and a plurality of groups of symmetrically distributed liquid separation holes and data line wire collection holes, the E-E end plate is provided with liquid return holes and a plurality of groups of symmetrically distributed liquid separation holes, and liquid return holes are formed in the G-G end plate, the liquid distribution pipe is connected with the liquid distribution holes in the E-E end plate through the liquid distribution holes in the A-A end plate, the liquid return collecting pipe is connected with the liquid return collecting holes in the G-G end plate through the liquid return collecting holes in the C-C end plate, the bottom of the A-A end plate is provided with an X-shaped slotted hole, a vacuum pumping valve and a vacuum degree sensor are arranged in a signal line cavity of the liquid distribution box, and a temperature sensor and a flow velocity sensor are arranged in the liquid return collecting pipe and the liquid injection collecting pipe of the liquid distribution box; the overground heat exchange system side pipeline comprises a primary heat supply network water supply pipe, a primary heat supply network water return pipe, a primary heat supply network bypass pipe, a secondary heat supply network water supply pipe, a secondary heat supply network water return pipe, a load side water supply pipe and a load side water return pipe; the overground heat exchange system side pipeline data acquisition and monitoring system comprises: the system comprises a heat source circulating pump, a primary heat supply network circulating pump, a secondary heat supply network circulating pump, a differential pressure sensor, a temperature difference sensor, a control actuator, a data transmission line, a pressure sensor data line, a temperature sensor data line, a variable frequency regulator, a data acquisition module, a data monitoring module and a computer.

Compared with the prior art, the invention has the following advantages:

1. according to the geothermal exploitation and utilization method for the hot dry rock, a plurality of auxiliary wells share one main well, so that the number of drilling wells is reduced, the compactness of a heat source side system is improved, and the underground space is saved;

2. according to the method for exploiting and utilizing the geothermal heat of the dry hot rock, the underground rock stratum heat exchange tubes are only paved in the geothermal energy enrichment area, so that the system is good in economy;

3. according to the method for exploiting and utilizing the geothermal heat of the dry hot rock, the underground rock stratum heat exchange tube is made of the composite phase change heat storage material and can supply constant-temperature hot water;

4. the method for exploiting and utilizing the geothermal energy of the hot dry rock realizes a distributed heat supply mode, breaks through the situation that a service object in the traditional centralized heat supply mode is only a heating user, and can meet the requirements of production and living users;

5. the method for exploiting and utilizing the geothermal heat of the hot dry rock breaks through the situation that the traditional centralized heating mode is only applied to the north, and the heat users in any geographical position can be realized in principle;

6. according to the method for exploiting and utilizing the geothermal energy of the hot dry rock, the heat exchange efficiency of an underground heat exchange system can be obviously improved through the secondary heating structure of the underground rock heat exchange tube, the geothermal energy is efficiently extracted, and the system operation efficiency is high;

7. according to the system for exploiting and utilizing the geothermal heat of the dry hot rock, disclosed by the invention, the heat exchange fluid flows in a closed cycle among the heat source side pipeline, the primary heat supply network side pipeline and the secondary heat supply network side pipeline, so that the water resource can be effectively saved, and the energy loss caused by leakage can be reduced;

8. the system for exploiting and utilizing the geothermal energy of the hot dry rock adopts the improved distributed two-stage pump indirect transmission and distribution system, and realizes the coordinated operation of the overground heat exchange system, the underground heat exchange system and the fluid transmission and distribution system.

In conclusion, the system is reasonable, the method steps are simple, the design is novel, the energy is saved conveniently, the high-efficiency geothermal exploitation and utilization can be realized, the good energy-saving effect can be achieved, the practicability is high, and the popularization and application values are high.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic structural view of a geothermal exploitation system of hot dry rock according to the present invention;

FIG. 2 is a schematic diagram of the underground heat exchange system of the present invention;

FIG. 3.1 is a front view of the liquid distribution box;

fig. 3.2 is a top view of fig. 3.1;

FIG. 3.3 is a cross-sectional view A-A of FIG. 3.1;

FIG. 3.4 is a cross-sectional view B-B of FIG. 3.1;

FIG. 3.5 is a cross-sectional view C-C of FIG. 3.1;

FIG. 3.6 is a cross-sectional view taken along line D-D of FIG. 3.1;

FIG. 3.7 is a cross-sectional view E-E of FIG. 3.1;

FIG. 3.8 is a cross-sectional view F-F of FIG. 3.1;

FIG. 3.9 is a sectional view taken along line G-G of FIG. 3.1;

FIG. 3.10 is a cross-sectional view taken at H-H of FIG. 3.2;

FIG. 3.11 is a cross-sectional view taken along line I-I of FIG. 3.2;

FIG. 3.12 is an isometric view of FIG. 3.1;

FIG. 3.13 is a bottom view of FIG. 3.1;

FIG. 3.14 is a sectional view taken along line J-J of FIG. 3.1;

FIG. 4.1 is a front view of the support plate;

fig. 4.2 is a left side view of fig. 4.1;

FIG. 4.3 is a cross-sectional view taken along line K-K of FIG. 4.1;

FIG. 4.4 is a cross-sectional view taken along line L-L of FIG. 4.1;

FIG. 4.5 is a cross-sectional view M-M of FIG. 4.1;

fig. 4.6 is an isometric view of fig. 4.1;

FIG. 5.1 is a left side view of a horizontal subterranean formation heat exchange tube;

FIG. 5.2 is a cross-sectional view of the N-N (monitoring disk) of FIG. 5.1;

FIG. 5.3 is a cross-sectional view of the O-O of FIG. 5.1;

FIG. 5.4 is an isometric view of the monitoring disk;

FIG. 5.5 is a partial rendering of FIG. 5.4;

fig. 5.6 is the layout of fig. 5.4;

figure 5.7 is a longitudinal cross-sectional view of the end of the secondary well.

Detailed Description

As shown in fig. 1 to 5.7, the method for geothermal mining and utilizing dry hot rock of the present embodiment includes the following steps:

firstly, carrying out geothermal energy detection, drilling a main well 5-1, drilling an annular slotted hole at the bottom of the main well 5-1, and drilling a plurality of auxiliary wells uniformly distributed around the main well 5-1 at the bottom of the main well 5-1;