阅读说明：本技术 一种地下能源开发与回收利用系统 (Underground energy development and recycling system ) 是由 周群道 张玲 于 2020-12-28 设计创作，主要内容包括：本发明公开了一种地下能源开发与回收利用系统,其通过深水井设置,采用开采井与回灌井配合的方式实现地下热量的提取,提取的热水或蒸汽在地表的梯级利用后再通过回灌管将其导流至回灌井内,回灌管内设置有重力发电装置,通过重力发电装置与地表输电装置连接实现外部电力供应；当井深达到4000米以上或热储层段温度大于150摄氏度时,本系统将开采井与回灌井合二为一,通过将井体延伸至干热岩层,同时将回水管导入至干热岩层实现水体载热,水层与干热岩层接触后产生温度高、压力大的蒸汽,在蒸汽段上设置有导气管道将高温蒸汽载水体压力下,输送至地表实现热电使用、供暖以及温室采暖等使用。(The invention discloses an underground energy development and recycling system, which is arranged through a deep well, realizes extraction of underground heat by adopting a mode of matching a production well and a recharge well, guides extracted hot water or steam into the recharge well through a recharge pipe after gradient utilization of the ground surface, is internally provided with a gravity power generation device, and is connected with a ground surface power transmission device through the gravity power generation device to realize external power supply; when the well depth reaches more than 4000 meters or the temperature of a heat storage layer section is more than 150 ℃, the system combines a production well and a recharge well into a whole, the well body extends to a dry-hot rock stratum, a water return pipe is guided into the dry-hot rock stratum to realize water body heat carrying, steam with high temperature and high pressure is generated after a water layer is contacted with the dry-hot rock stratum, an air guide pipeline is arranged on a steam section to convey high-temperature steam to the ground surface under the pressure of the water body, and the use of thermoelectricity use, heating, greenhouse heating and the like is realized.)

1. The utility model provides an underground energy development and recycle system which characterized in that: the high-temperature liquid or high-temperature gas extraction device comprises an underground structure, wherein a conveying pipeline is arranged in the underground structure, high-temperature liquid or high-temperature gas in an underground deep well is extracted through the conveying pipeline, a thermoelectric module is arranged on the ground surface and connected with the conveying pipeline, the conversion of the heat energy of the high-temperature liquid or the high-temperature gas to electric energy is realized through the connection, the rear side of the thermoelectric module is connected with a building to utilize the residual temperature behind the thermoelectric module, the rear end of the building is connected with a recharge pipe in the deep well, a gravity generating device is arranged in the recharge pipe, and the gravity generating device is connected with an external power transmission device through a cable to realize the outward transmission of the electric power.

2. The pumped gravel-making recharging well of claim 1, wherein: the building on be connected the heating wet return, the heating wet return be connected to the jar that catchments, the rear side of jar that catchments is connecting coarse filtration jar and smart jar of filtering, the rear side of smart jar of filtering connect the exhaust can, the direct recharge union coupling with the deep well inside of exhaust can.

3. The pumped gravel-making recharging well of claim 1, wherein: when the underground structure is arranged, when the depth of a mining well is less than or equal to 4000 meters or the heat storage temperature is less than 150 ℃, two wells are arranged to be matched with each other for use, one well is a mining well, the other well is a recharging well, a water lifting pipe is arranged in the mining well, and a water pump is arranged in the water lifting pipe; a recharging pipe is arranged in the recharging well, and a gravity power generation device is arranged in the recharging pipe.

4. The pumped gravel-making recharging well of claim 3, wherein: when the production well and the recharge well are arranged, side wall perforations are arranged in the water-containing layer area at the bottoms of the production well and the recharge well to communicate the inside and the outside of the production well, the water taking sections of the production well and the recharge well are the same water-containing layer group, and a water circulation structure is formed through the surface pipeline and the underground water-containing layer.

5. The pumped gravel-making recharging well of claim 3 or 4, wherein: the depth from the water surface of the production well to the ground surface is H1, the depth from the water surface of the recharge well to the ground surface is H2, and H1 is not less than H2.

6. The pumped gravel-making recharging well of claim 3 or 4, wherein: when the thermal reservoir is sandstone thermal reservoir, the distance between the production well and the recharge wellr _T The following formula (1) is set:

in the formula:

r _T -reasonable well spacing in meters (m);

c _w specific heat capacity of geothermal water in units of Joule]Per kilogram centigrade (J/(kg. DEG C));

Qproduction in kilograms per second (kg/s);

t-thermal breakthrough time in seconds(s);

H-total thickness of sandstone layer in the recharge interval in meters (m);

c _h -the volumetric heat capacity of the aquiferIs located at the position of jiao (ear)]Per cubic meter degree centigrade (J/(m)³C.)) can be calculated using equation (2):

c _h =

in the formula:

φ-sandstone porosity;

ρ _r sandstone density in kilograms per cubic meter (kg/m)³)；

c _r Sandstone specific heat capacity in units of Joule]Per kilogram centigrade (J/(kg. DEG C));

c _w specific heat capacity of geothermal water in units of Joule]Per kilogram centigrade (J/(kg. DEG C));

ρ _w density of geothermal water in kilograms per cubic meter (kg/m)³)。

7. The pumped gravel-making recharging well of claim 1, wherein: when the underground structure is arranged, when the well depth is more than 4000 meters or the temperature of a heat storage layer section is more than 150 ℃, the exploitation well and the recharge well are combined into a well, the bottom of a well body extends to a dry-hot rock stratum, working medium water is introduced into the well body, the upper part of a water body section is a steam section, and a packer is arranged at the upper part of the steam section to separate the steam section from upper air; the well body is inside to be provided with air duct and recharge pipe, the bottom of air duct extend to in the steam section, the wet return extend to inside the water body section, be provided with gravity power generation facility in the inside of recharge pipe.

8. The pumped gravel-making recharging well of claim 7 or 8, wherein: the steam section is H steam from the ground surface, the gravity power generation device is H water from the top of the water layer, the installation position of the gravity power generation device needs to meet the condition that rho water gH water is not less than rho steam gH steam when the installation position is set, and the automatic rising of the steam in the dry and hot rock well to the ground surface can be realized through the structure.

9. The pumped gravel-making recharging well of claim 7 or 8, wherein: the well depth of underground structure be greater than 4000 meters degree of depth or when heat storage layer section temperature is greater than 150 degrees centigrade, it is provided with thermoelectric module at the earth's surface, thermoelectric module's rear side be provided with the building or breed and plant the canopy, be provided with the water-collecting tank at the building or breed the rear side of planting the canopy, the rear side of water-collecting tank is connecting coarse filtration jar and fine filtration jar, the rear side of fine filtration jar connecting the exhaust can, the exhaust can pass through circulating pump and secret wet return and be connected, secret wet return is connected with the inside recharge pipe of deep well.

Technical Field

The invention belongs to the field of clean energy development and utilization, and particularly relates to an underground energy development and recycling system capable of being matched with the existing geothermal resources for use.

Background

The underground clean energy developed and utilized at present is geothermal resource, in the existing geothermal energy utilization system, underground hot water is extracted, high-temperature hot water heat is extracted and then is recharged to the underground, the underground heat is extracted to the ground through water (or other working media) for use, but in the whole cyclic utilization process, a work seat step that other energy is not utilized exists, and in the recharging process, low-temperature tail water is recharged to the underground from the ground surface, and gravitational potential energy is wasted or not utilized; moreover, the existing dry-hot rock well is high in well building cost, when the dry-hot rock well is used, water is injected into the ground, and then heat is conveyed to the ground surface in a hot water mode, so that geothermal energy is absorbed.

In view of the above-mentioned deficiencies in the prior art, as a technical person in the industry, how to design a novel underground energy development and recycling system through technical innovation is a technical problem to be solved urgently by technical persons in the industry, which can realize extraction of various underground energy sources and realize the maximum collection of available resources in the extraction process.

Disclosure of Invention

In order to overcome the defects of the prior art and improve the development and utilization effects of underground energy, the invention provides an underground energy development and recycling system, geothermal energy can be extracted through water or other working media, the water or other working media are recharged to the underground after the heat is extracted, and the extraction of gravitational potential energy is realized in the recharging process to the underground.

In order to achieve the technical purpose, the invention adopts the following scheme: the utility model provides an underground energy development and recycle system, its includes underground structure, underground structure in be provided with pipeline, through extracting high-temperature liquid or high-temperature gas in the underground deep well at pipeline, the earth's surface is provided with thermoelectric module and is connected with pipeline, realizes the conversion of high-temperature liquid or high-temperature gas heat energy to the electric energy through this kind of connection, thermoelectric module's rear side and building connect the surplus temperature behind the thermoelectric module and utilize, the rear end of building connect the inside recharge pipe of deep well, the inside of recharge pipe be provided with gravity power generation facility, gravity power generation facility pass through the cable and be connected the realization electric power and outwards deliver.

The building on be connected the heating wet return, the heating wet return be connected to the jar that catchments, the rear side of jar that catchments is connecting coarse filtration jar and smart jar of filtering, the rear side of smart jar of filtering connect the exhaust can, the direct recharge union coupling with the deep well inside of exhaust can.

When the underground structure is arranged, when the depth of a mining well is less than or equal to 4000 meters or the heat storage temperature is less than 150 ℃, two wells are arranged to be matched with each other for use, one well is a mining well, the other well is a recharging well, a water lifting pipe is arranged in the mining well, and a water pump is arranged in the water lifting pipe; a recharging pipe is arranged in the recharging well, and a gravity power generation device is arranged in the recharging pipe.

When the production well and the recharge well are arranged, side wall perforations are arranged in the water-containing layer area at the bottoms of the production well and the recharge well to communicate the inside and the outside of the production well, the water taking sections of the production well and the recharge well are the same water-containing layer group, and a water circulation structure is formed through the surface pipeline and the underground water-containing layer.

The depth from the water surface of the production well to the ground surface is H1, the depth from the water surface of the recharge well to the ground surface is H2, and H1 is not less than H2.

When the thermal reservoir is sandstone thermal reservoir, the distance between the production well and the recharge wellr _T The following formula (1) is set:

in the formula:

r _T -reasonable well spacing in meters (m);

c _w specific heat capacity of geothermal water in units of Joule]Per kilogram centigrade (J/(kg. DEG C));

Qproduction in kilograms per second (kg/s);

tthermal breakthrough time in seconds(s))；

H-total thickness of sandstone layer in the recharge interval in meters (m);

c _h -heat capacity per unit volume of aquifer, per unit of Joule]Per cubic meter degree centigrade (J/(m)³C.)) can be calculated using equation (2):

c _h =

in the formula:

φ-sandstone porosity;

ρ _r sandstone density in kilograms per cubic meter (kg/m)³)；

c _r Sandstone specific heat capacity in units of Joule]Per kilogram centigrade (J/(kg. DEG C));

c _w specific heat capacity of geothermal water in units of Joule]Per kilogram centigrade (J/(kg. DEG C));

ρ _w density of geothermal water in kilograms per cubic meter (kg/m)³)。

When the underground structure is arranged, when the well depth is more than 4000 meters or the temperature of a heat storage layer section is more than 150 ℃, the exploitation well and the recharge well are combined into a well, the bottom of a well body extends to a dry-hot rock stratum, working medium water is introduced into the well body, the upper part of a water body section is a steam section, and a packer is arranged at the upper part of the steam section to separate the steam section from upper air; the well body is inside to be provided with air duct and recharge pipe, the bottom of air duct extend to in the steam section, the wet return extend to inside the water body section, be provided with gravity power generation facility in the inside of recharge pipe.

The steam section is H steam from the ground surface, the gravity power generation device is H water from the top of the water layer, the installation position of the gravity power generation device needs to meet the condition that rho water gH water is not less than rho steam gH steam when the installation position is set, and the automatic rising of the steam in the dry and hot rock well to the ground surface can be realized through the structure.

The well depth of underground structure be greater than 4000 meters degree of depth or when heat storage layer section temperature is greater than 150 degrees centigrade, it is provided with thermoelectric module at the earth's surface, thermoelectric module's rear side be provided with the building or breed and plant the canopy, be provided with the water-collecting tank at the building or breed the rear side of planting the canopy, the rear side of water-collecting tank is connecting coarse filtration jar and fine filtration jar, the rear side of fine filtration jar connecting the exhaust can, the exhaust can pass through circulating pump and secret wet return and be connected, secret wet return is connected with the inside recharge pipe of deep well.

The invention has the beneficial effects that: according to the device, the extraction of underground heat is realized by adopting a mode of matching the production well and the recharge well through the arrangement of the deep water well, the extracted hot water or steam is guided into the recharge well through the recharge pipe after being utilized in steps on the ground surface, the gravity power generation device is arranged in the recharge pipe, the gravity power generation device is connected with the ground surface power transmission device to realize external power supply, the distance between the production well and the recharge well is limited by the device, meanwhile, the bottom well walls of the production well and the recharge well are processed in a penetrating way, and the hot water circulation of the production well and the recharge well is realized through an underground aquifer; when the well depth reaches more than 4000 meters or the temperature of a heat storage layer section is more than 150 ℃, the system integrates a production well and a recharge well, the well body extends to a dry-hot rock stratum, a water return pipe is guided into the dry-hot rock stratum to realize water heat carrying, steam with high temperature and high pressure is generated after a water layer is contacted with the dry-hot rock stratum, an air guide pipeline is arranged on a steam section, the high-temperature steam is conveyed to the ground surface under the water body pressure through the air guide pipeline to realize thermoelectric use, heating, greenhouse heating and the like, liquid generated after the steam is cooled is guided to the dry-hot rock stratum at the bottom of the well again to realize the production of the high-temperature steam, and underground heat is conveyed to the ground surface through the transformation from liquid state to gas state. To summarize: the system of the invention realizes the extraction of underground water or steam and then uses the extracted underground water on the ground surface, conveys the liquid water after heat utilization to the underground, converts the gravitational potential energy into electric energy in the conveying process, and then stores the heat into the water or the steam through bottom hole circulation and extracts the heat to the ground surface for use, thus realizing the utilization of underground energy in such a circulation way, and being an ideal underground energy development and recycling system.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic front view of the present invention;

FIG. 3 is a schematic illustration of the internal structure of the production well of FIG. 1;

FIG. 4 is a schematic view of the internal structure of the recharge well of FIG. 1;

FIG. 5 is a schematic view of a production well and a recharge well sharing a single well structure;

in the attached drawings, 1, a production well, 10, a greenhouse, 11, side wall perforations, 12, a hot water area, 13, a cold water area, 2, a water lifting pipe, 21, a submersible pump, 22, a cold water collecting tank, 23, a coarse filtering tank, 24, a fine filtering tank, 25, an exhaust tank, 26, a return water pressure pump, 27, a bypass pipe, 28, an underground return pipe, 29, a booster pump, 3, a water barrier, 31, a water-containing layer, 4, a water collecting tank, 5, a building, 51, a heating tail end, 52, a heating pipe, 53, a heating return pipe, 54, a water source supplementing pipe, 6, a recharging well, 61, an air guide pipe, 62, a packer supporting rod, 63, a packer, 64, a steam section, 65, a water body section, 7, a recharging pipe, 71, a gravity power generation device, 8, an external power transmission device, 9 and a thermoelectric module.

Detailed Description

Referring to the attached drawings, the underground energy development and recycling system comprises an underground structure, wherein a conveying pipeline is arranged in the underground structure, high-temperature liquid or high-temperature gas in an underground deep well is extracted through the conveying pipeline, a thermoelectric module 6 is arranged on the ground surface and connected with the conveying pipeline, the conversion of heat energy of the high-temperature liquid or the high-temperature gas into electric energy is realized through the connection, the rear side of the thermoelectric module 6 is connected with a building to utilize the residual temperature behind the thermoelectric module 6, the rear end of the building is connected with a recharge pipe 7 in the deep well, a gravity power generation device 71 is arranged in the recharge pipe 7, the gravity power generation device 71 is connected with an external power transmission device 71 through a cable to realize external connection of electric power, and the specific system is shown as the following specific embodiment.

Example 1:

as shown in fig. 1, when the underground structure is arranged, when the well depth is less than 4000 meters or the heat storage temperature is less than 150 ℃, the system is arranged such that two wells are mutually matched for use, one well is a production well 1 and the other well is a recharge well 6, a water lifting pipe 2 is arranged in the production well 1, a water taking pump is arranged in the water lifting pipe 2, and the water taking pump is a submersible pump 21; a recharging pipe 7 is arranged in the recharging well 6, and a gravity generating set 71 in a pipeline is arranged in the recharging pipe 7. As shown by the arrow in figure 1, a water body moving from the right cold water area 13 to the left hot water area 12 is formed between the recharge well 6 and the production well 1, and the conversion of heat to carrier water is realized while the water body moves.

When the production well 1 and the recharge well 6 are arranged, side wall perforations 11 are arranged in the aquifer 31 area at the bottom of the production well 1 and the recharge well 6 to realize the communication between the inside and the outside of the well, the production well 1 and the recharge well 6 form a water circulation structure through an earth surface pipeline and an underground aquifer, the circulation structure is shown in figure 1, the transverse circulation of underground water is realized at the position where the underground water-resisting layer 3 and the aquifer 31 are overlapped and staggered, through the structure arrangement, the water source can flow from the recharge well 6 to the production well 1, and the transfer of underground energy to liquid is realized in the flowing process; when the system is designed to be used at the ground, a water collecting tank 4 is arranged on the ground surface to collect underground hot water, and the underground hot water is conducted into a thermoelectric module 9 for thermal power generation after the collection is finished, wherein the thermoelectric module is a general technology and is not described in detail herein; the water lifting pipe 2 is connected with a heating pipe 52 and extends to a heating end 51 inside the building 5 for indoor heating, and the heating end is a radiator or other heat radiating devices.

The building 5 is connected with a heating water return pipe 53, the heating water return pipe 53 is connected to a cold water collecting tank 22, the rear side of the cold water collecting tank 22 is connected with a coarse filtering tank 23 and a fine filtering tank 24, the rear side of the fine filtering tank 24 is connected with an exhaust tank 25 to collect liquid after heating and cooling, and the exhaust tank 25 is directly connected with a recharging pipe 7 in the recharging well 6.

Further setting, a return water pressure pump 26 is arranged at the rear side of the exhaust tank 25, the pressure boost of underground return water is realized through the return water pressure pump 26, and in order to prevent the return water pressure pump 26 from breaking down, a bypass pipe 27 is arranged on the return water pressure pump 26 to realize bypass; through the above structural arrangement, it is also noted that when the system is set, as shown in fig. 1, the depth from the water surface of the production well to the ground surface is H1, the depth from the water surface of the recharge well to the ground surface is H2, H1 is not less than H2, the recharge effect can be ensured due to the structural arrangement, when the vertical height from the ground surface to the gravity power generation device 71 is about 4000 meters, the height of the building is increased, and then the pressure is increased through the recharge pressure pump 26, the pressure at the lower part in the recharge pipe 7 is higher, so that the conversion of larger energy can be realized, and the potential energy is converted into electric energy through high water pressure and then is guided into the external power transmission device 8 to realize external power supply.

Further, as the above structure is arranged, one well is the production well 1, and the other well is the recharging well 6, and in order to ensure that the energy loop can be smoothly formed between the two wells, the distance between the two wells needs to be limitedr _T It is defined as formula (1):

in the formula:

r _T -reasonable well spacing in meters (m);

c _w specific heat capacity of geothermal water in units of Joule]Per kilogram centigrade (J/(kg. DEG C));

Qproduction in kilograms per second (kg/s);

t-thermal breakthrough time in seconds(s);

H-total thickness of sandstone layer in the recharge interval in meters (m);

c _h -heat capacity per unit volume of aquifer, per unit of Joule]Per cubic meter degree centigrade (J/(m)³C.)) can be calculated using equation (2):

c _h =

in the formula:

phi-sandstone porosity;

ρ r-sandstone density in kilograms per cubic meter (kg/m)³)；

cr-specific heat capacity of sandstone, in units of Joule per kilogram of degree centigrade (J/(kg. degree. C));

cw-specific heat capacity of geothermal water, in units of Joule per kilogram of degree Celsius (J/(kg. degree. C));

ρ w-density of geothermal water in kilograms per cubic meter (kg/m)³)。

By applying the measured data in the formula, the distance between the two wells can be accurately calculated; and (3) determining the distance rT between the exploitation well and the recharge well by adopting a simulation method.

Example 2:

when the underground structure is arranged, as shown in fig. 2, when the well depth is more than 4000 meters or the temperature of a heat storage layer section is more than 150 ℃, the production well 1 and the recharge well 6 are combined into one well, the bottom of the well body extends to a dry and hot rock stratum 32, a water body section 65 is arranged in the well body, a steam section 64 is arranged at the upper part of the water body section 65, a packer 63 is arranged at the upper part of the steam section 64 to separate the steam section 64 from the upper part, and the packer 63 can be supported and erected by adopting a packer supporting rod 32 in a transverse horizontal supporting mode; the well body is internally provided with an air duct 61 and a recharging pipe 7, the bottom of the air duct 61 extends into the steam section 64, the recharging pipe 7 extends into the water body section 65, and the recharging pipe 7 is internally provided with a gravity power generation device 71. Through this kind of structure setting, when this system sets up, underground high temperature steam leads into to the earth's surface through air duct 61, leans on cold water pressure to extrude it to the earth's surface when leading out, and for smoothly realizing that steam goes upward, this system need accord with following technical condition when setting up: as shown in fig. 2 and 5, the depth of the steam section 64 from the earth surface is H steam, the depth of the gravity power generation device 71 from the top of the water body section 65 is H water, and the installation position of the gravity power generation device needs to meet the condition that rho water gH is not less than rho steam gH steam when being set, so that when the well depth is greater than 4000 meters or the temperature of the thermal storage layer is greater than 180 ℃, the steam can automatically rise from the well to the earth surface through cold water pressure.

Further, when the ground surface is arranged, the air duct 61 is directly connected with the ground thermoelectric module 9 to realize thermoelectric conversion, the rear side of the thermoelectric module 9 is provided with the building 5 or the cultivation and planting shed 10, indoor heating is carried out in the building 5 through the heating tail end 51, the heating tail end is a radiator or other heat dissipation devices,

the rear sides of the building 5 and the cultivation and planting shed 10 are connected to a cold water collecting tank 22 through a heating water return pipe 53, the rear side of the cold water collecting tank 22 is connected with a coarse filtering tank 23 and a fine filtering tank 24, the rear side of the fine filtering tank 24 is connected with an exhaust tank 25 to collect heated and cooled liquid, and the exhaust tank 25 is directly connected with a recharge pipe 7 inside a recharge well 6 through an underground water return pipe 28. Further, a return water pressure pump 26 is arranged on the rear side of the exhaust tank 25, and the underground return water is pressurized through the return water pressure pump 26.

Through the structure arrangement, the system integrates the exploitation well and the recharge well, the well body extends to the dry-hot rock stratum 32, the temperature of the dry-hot rock stratum is above 180 ℃, the recharge pipe 7 is led into the dry-hot rock stratum 32 to realize the molding of the water body section 65, the water body section 65 is contacted with the dry-hot rock stratum 32 to generate a steam section 64 with high temperature and high pressure, the steam section 64 is provided with an air duct 61 to convey high-temperature steam to the ground surface by the pressure of cold water so as to realize thermoelectric use, heating and greenhouse heating, the liquid generated after the steam is cooled is guided to the dry-hot rock stratum at the bottom of the well again so as to realize the generation of the high-temperature steam, if water source consumption is generated, water source supplement can be realized through the water source supplement pipe 54 at the upper part of the exhaust tank 25, and underground heat is conveyed to the ground surface through the liquid-to-gas circulation.

To summarize: the system of the invention realizes the extraction of underground water or steam and then uses the underground water or steam on the ground surface, simultaneously conveys liquid water from the ground surface to the ground, converts the gravitational potential energy into electric energy in the conveying process, and then stores the heat into the water or steam through bottom hole circulation and extracts the heat to the ground surface for use, thus realizing the utilization of underground energy in such a circulation way, and being an ideal underground energy development and recycling system.