Fracturing single-well multi-branch compressed air energy storage ventilation system for coal mine well
阅读说明：本技术 一种煤矿井用压裂单井多分支压缩空气储能通风系统 (Fracturing single-well multi-branch compressed air energy storage ventilation system for coal mine well ) 是由 于海龙 王奕雅 刘恩海 张桂芳 沈冰燕 孙运兰 朱宝忠 霍爱玺 于 2019-09-05 设计创作，主要内容包括：本发明提供一种煤矿井用压裂单井多分支压缩空气储能通风系统,包括压裂单井多分支换热系统、井下通风换热系统和低沸点工质换热系统,所述的压裂单井多分支换热系统通过一定直径的管道与井下通风换热系统相连设有混合风箱,流经换热器换热升温后的工质与流经压裂单井多分支换热系统换热升温后的工质在混合风箱内充分混合后送入地下煤矿井,工质经井下通风换热系统末端换热器最终以适宜温度排至大气。本发明采用上述技术方案后本发明高效利用地热能进行煤矿井换热通风,解决了目前矿井通风中存在的一些问题,更加经济环保。(The invention provides a fracturing single-well multi-branch compressed air energy storage ventilation system for a coal mine, which comprises a fracturing single-well multi-branch heat exchange system, an underground ventilation heat exchange system and a low-boiling point working medium heat exchange system, wherein the fracturing single-well multi-branch heat exchange system is connected with the underground ventilation heat exchange system through a pipeline with a certain diameter and is provided with a mixed air box, working medium subjected to heat exchange and temperature rise by a heat exchanger and working medium subjected to heat exchange and temperature rise by the fracturing single-well multi-branch heat exchange system are fully mixed in the mixed air box and then are sent to the underground coal mine, and the working medium is finally discharged to the atmosphere at an appropriate temperature through a heat exchanger at the tail. By adopting the technical scheme, the invention efficiently utilizes geothermal energy to carry out heat exchange and ventilation of the coal mine, solves some problems in the conventional mine ventilation, and is more economic and environment-friendly.)
1. The utility model provides a colliery is many branches of compressed air energy storage ventilation system of fracturing single well for well which characterized in that: comprises a fracturing single-well multi-branch heat exchange system, an underground ventilation heat exchange system and a low boiling point working medium heat exchange system, wherein the fracturing single-well multi-branch heat exchange system and the low boiling point working medium heat exchange system are connected with the underground ventilation heat exchange system through a mixed air box,
the fracturing single-well multi-branch heat exchange system is used for pressing a working medium into the ground, performing heat exchange and temperature rise on the working medium by using underground shallow geothermal energy, and finally conveying the heated working medium to the initial end of the underground ventilation heat exchange system;
the underground ventilation heat exchange system is used for extracting an above-ground working medium, and the above-ground working medium and the working medium which flows through the fracturing single-well multi-branch heat exchange system for heat exchange and temperature rise are fully mixed through the mixing air box (25) to form fresh air with the temperature acceptable by a human body and are injected into an underground coal mine (15);
the low-boiling point working medium heat exchange system is used for exchanging heat and heating the overground working medium extracted by the underground ventilation heat exchange system through the first heat exchanger (22) on the one hand, and is used for exchanging heat and cooling the mixed working medium discharged from the tail end of the underground coal mine (15) through the second heat exchanger (18) on the other hand.
2. The fracturing single-well multi-branch compressed air energy-storage ventilation system for the coal mine well, according to claim 1, is characterized in that: the fracturing single-well multi-branch heat exchange system comprises three subsystems, namely an injection system, a heat exchange system and a discharge system, wherein the injection system is connected with an injection end of the heat exchange system and is used for injecting a heat exchange working medium; the heat exchange system is used for realizing heat exchange between the working medium and the shallow rock body (7); the discharge system is connected with the discharge end of the heat exchange system and is used for conveying the working medium subjected to heat exchange into the mixing air box (25).
3. The fracturing single-well multi-branch compressed air energy-storage ventilation system for the coal mine well, as claimed in claim 2, wherein: the injection system comprises an air compressor (1), a valve (2), an injection pipe (3), a first insulating and conducting material (5) and a first working medium (4); the heat exchange system comprises a shallow rock body (7) and a heat exchange fracturing wellbore (6); the discharge system comprises a discharge pipe (10), a second insulating and conducting material (8) and a second working medium (9); the heat exchange fracturing well hole is characterized in that a first isolation and conduction type material (5) is filled between the outer wall of an injection pipe (3) and a shallow rock body (7), a second isolation and conduction type material (8) is filled between the outer wall of a discharge pipe (10) and the shallow rock body (7), the injection pipe (3) is provided with a plurality of injection pipes and arranged along the circumferential direction of the discharge pipe (10), the tail ends of the injection pipe (3) and the discharge pipe (10) are both positioned in the shallow rock body (7), and the tail end of the injection pipe (3) forms a heat exchange fracturing well hole (6) communicated with the tail end of the discharge pipe (10) in a fracturing mode; external working media are injected into the injection pipe (3) through the valve (2) and the air compressor (1) to form a first working media (4), and the first working media (4) flow through the heat exchange fracturing well hole (6) to be subjected to heat exchange and then are discharged into the discharge pipe (10) to form a second working media.
4. The fracturing single-well multi-branch compressed air energy-storage ventilation system for the coal mine well, according to claim 3, is characterized in that: the upper end of each heat exchange fracturing well hole (6) is communicated with the tail end of the corresponding injection pipe (3), the lower end of each heat exchange fracturing well hole (6) is communicated with the tail end of the corresponding discharge pipe (10), and the heat exchange fracturing well holes (6) are gradually inclined towards the direction of the discharge pipes (10) from top to bottom.
5. The fracturing single-well multi-branch compressed air energy-storage ventilation system for the coal mine well, according to claim 3, is characterized in that: the underground ventilation heat exchange system comprises a plurality of air pumps and valves, the tail end of the discharge system is connected with a mixed air box (25) and is provided with the air pump (11) and the valve (12), the air pump (11) pumps a working medium II (9) into the mixed air box (25), the inlet end of a heat exchanger I (22) is respectively connected with the valve (21) and the air pump (20), the air pump (20) pumps a working medium III (19) to flow through the heat exchanger I (22) for heat exchange and temperature rise to form a working medium IV (23), the outlet end of the heat exchanger I (22) is connected with the mixed air box (25) and is provided with the valve (24), the working medium IV (23) enters the mixed air box (25) to be fully mixed with the working medium II (9) to form a working medium V (14), the mixed air box (25) is connected with the top end of an underground coal mine (15) through a pipeline and is provided with the valve (13), the heat exchanger II (18) is connected with the tail end of 16) And a valve (17), wherein the working medium five (14) flows through the heat exchanger two (18) for heat exchange and temperature reduction to form a working medium six (27), and then is discharged to the atmosphere.
6. The fracturing single-well multi-branch compressed air energy-storage ventilation system for the coal mine well, according to claim 1, is characterized in that: and the low-boiling point working medium heat exchange system is provided with a low-boiling point working medium (26) between the first heat exchanger (22) and the second heat exchanger (18) for circulation.
Technical Field
The invention relates to the technical field of underground heat energy heat exchange ventilation, in particular to a fracturing single-well multi-branch compressed air energy storage ventilation system for a coal mine well.
Background
In the coal mining process, harmful gas in the underground coal mine can increase along with the deepening of the coal mine, and fresh air needs to be continuously injected for ensuring the life safety of workers working in the underground coal mine. In winter, the underground temperature of a coal mine is low, fresh air reaching the temperature acceptable by a human body needs to be injected, and an overground heat pump and a heat exchanger can meet the heat exchange requirement, but have the problems of large volume, difficulty in construction, easiness in damage when the machine is placed outdoors for a long time, failure in reaching the expected heat exchange temperature and the like.
Geothermal resources are renewable clean energy with great influence, have the advantages of stability, no influence of day-night temperature difference and seasonal temperature, high utilization rate, safe use, low operation cost and the like, and are very environment-friendly.
The geothermal energy reserves in China are relatively rich, the total storage capacity accounts for about 7.9 percent of the global geothermal energy reserves, and the energy which can be exploited and utilized is equivalent to 4626.5 hundred million standard coal.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a fracturing single-well multi-branch compressed air energy storage ventilation system for a coal mine, aiming at overcoming the defects that in the prior art, a heat pump heat exchanger used in the coal mine underground heat exchange ventilation system is large in size, a machine is easy to damage, construction is inconvenient, an expected heat exchange effect cannot be achieved, fund waste is caused, and the safety of coal mine underground construction and mine workers is seriously affected.
The technical scheme adopted for solving the technical problems is as follows: a fracturing single-well multi-branch compressed air energy storage ventilation system for a coal mine well comprises a fracturing single-well multi-branch heat exchange system, an underground ventilation heat exchange system and a low boiling point working medium heat exchange system, wherein the fracturing single-well multi-branch heat exchange system and the low boiling point working medium heat exchange system are connected with the underground ventilation heat exchange system through a mixed air box,
the fracturing single-well multi-branch heat exchange system is used for pressing a working medium into the ground, performing heat exchange and temperature rise on the working medium by using underground shallow geothermal energy, and finally conveying the heated working medium to the initial end of the underground ventilation heat exchange system;
the working medium generally refers to external air, the air compression equipment can press the air into the ground through a pipeline, shallow rock bodies (such as granite, metamorphic rock and the like) with proper positions and compact texture are selected according to geological exploration results, and the shallow rock bodies exchange heat with the air pressed into the ground to heat the air.
The underground ventilation heat exchange system is used for extracting an above-ground working medium, the above-ground working medium and the working medium which flows through the fracturing single-well multi-branch heat exchange system for heat exchange and temperature rise are fully mixed through the mixing air box, and fresh air with the temperature acceptable by a human body is formed and injected into an underground coal mine;
because the air temperature after the heat exchange with the shallow rock body is higher, the air is not suitable for being directly injected into the underground coal mine, external air needs to be additionally extracted to be fully mixed with high-temperature air for cooling, fresh air with the temperature acceptable by a human body is formed, and then the fresh air is injected into the underground coal mine.
The low boiling point working medium heat exchange system is used for exchanging heat and heating the overground working medium extracted by the underground ventilation heat exchange system through the heat exchanger, and is used for exchanging heat and cooling the mixed working medium discharged from the tail end of the underground coal mine through the heat exchanger.
Because the temperature of the external air is very low in winter, if the mixed air is directly mixed with the high-temperature air extracted from the underground, the mixed air possibly fails to reach the expected heat exchange temperature when being injected into the underground coal mine, the first heat exchanger is used for preheating cold air extracted from the outside, then the cold air is fully mixed with the high-temperature air extracted from the underground, the temperature is quickly adjusted, and fresh air with the temperature acceptable by a human body is injected into the underground coal mine; and the second heat exchanger is used for cooling the air exhausted from the tail end of the underground coal mine and finally exhausting the air to the atmosphere at a proper temperature.
Furthermore, the fracturing single-well multi-branch heat exchange system comprises three subsystems including an injection system, a heat exchange system and a discharge system, wherein the injection system is connected with an injection end of the heat exchange system and is used for injecting heat exchange working media; the heat exchange system is used for realizing heat exchange between the working medium and the shallow rock body; the discharge system is connected with the discharge end of the heat exchange system and is used for conveying the working medium subjected to heat exchange into the mixing air box.
Further, the injection system comprises an air compressor, a valve, an injection pipe, a first isolating and conducting material and a first working medium; the heat exchange system comprises a shallow rock body and a heat exchange fracturing wellbore; the discharge system comprises a discharge pipe, a second insulating and conducting material and a second working medium; the first insulating and conducting type material is filled between the outer wall of the injection pipe and the shallow rock body, the second insulating and conducting type material is filled between the outer wall of the discharge pipe and the shallow rock body, the injection pipe is provided with a plurality of injection pipes and arranged along the circumferential direction of the discharge pipe, the tail ends of the injection pipe and the discharge pipe are both positioned in the shallow rock body, and the tail ends of the injection pipe form heat exchange fracturing well holes communicated with the tail end of the discharge pipe in a fracturing mode; and an external working medium is injected into the injection pipe through a valve and an air compressor to form a first working medium, and the first working medium flows through the heat exchange fracturing well hole to be subjected to heat exchange and then is discharged into the discharge pipe to form a second working medium.
The fracturing single-well multi-branch heat exchange system adopts the following scheme: step 1: according to the geological exploration result, shallow rock bodies (such as granite, metamorphic rock and the like) with proper positions and compact texture are selected, and a plurality of wells (5-8 wells) required by construction are constructed at the positions according to the required heat exchange quantity and the well diameter, the well depth and the well spacing calculated by the geothermal gradient.
Step 2: the tail ends of a plurality of wells (4-7 wells) positioned on the periphery are communicated with the tail end of one well positioned in the middle position in a fracturing mode, and heat exchange fracturing multilateral well holes are formed in the communication.
And step 3: and (3) establishing an injection system, installing an injection pipe in the multi-opening injection well, and filling the first insulating conductive material.
And 4, step 4: and (4) establishing a discharge system, installing a discharge pipe in the middle discharge well, and filling a second insulating conductive material.
And 5: the injection system is connected with the ground through a pipeline and is provided with an air compressor and a valve, the valve is opened, the air compressor is started to press outside air into the ground, the discharge system is connected with the underground ventilation and heat exchange system through a pipeline with a certain diameter and is provided with an air suction pump and a valve, the valve is opened, the air suction pump is started, and underground high-temperature working medium is sucked into the mixing air box.
Furthermore, the upper ends of the heat exchange fracturing well holes are communicated with the tail ends of the corresponding injection pipes, the lower ends of the heat exchange fracturing well holes are communicated with the tail ends of the discharge pipes, and the heat exchange fracturing well holes are gradually inclined towards the direction of the discharge pipes from top to bottom.
And carrying out hydraulic fracturing on the shallow rock body below the injection pipe from the injection pipe, wherein in the hydraulic fracturing process, the shallow rock body below the injection pipe generates shearing slippage to form an artificial crack, so that a heat exchange fracturing well hole communicated with the discharge pipe is formed.
Further, the underground ventilation heat exchange system comprises a plurality of air pumps and valves, the tail end of the exhaust system is connected with the mixed air box and is provided with the air pumps and the valves, the air pumps pump the working medium two into the mixed air box, the inlet end of the heat exchanger is respectively connected with the valves and the air pumps, the air pumps pump the working medium three to heat through the heat exchange of the heat exchanger to form working medium four, the outlet end of the heat exchanger is connected with the mixed air box and is provided with the valves, the working medium four enters the mixed air box to be fully mixed with the working medium two to form working medium five, the mixed air box is connected with the top end of the underground coal mine through a pipeline and is provided with the valves, the heat exchanger two is connected with the tail end of the underground coal mine through the pipeline and is provided with the air pumps and the valves, and the working medium five.
Furthermore, the low-boiling point working medium heat exchange system has low-boiling point working medium circulation between the first heat exchanger and the second heat exchanger.
The invention has the beneficial effects that: the invention provides a fracturing single-well multi-branch compressed air energy storage ventilation system for a coal mine, which has the following advantages: 1. energy is saved, and shallow geothermal energy is fully utilized. 2. The floor space is saved, the appearance is neat and beautiful, and the damage is not easy. 3. The well diameter is small, and the ground building cannot be influenced. 4. Effectively improves the heat exchange capacity and enables the heat exchange working medium to reach the required heat exchange temperature. 5. Working media with different temperatures are fully mixed in the mixing air box, so that the heat exchange speed is improved, and the service life of the system is prolonged. 6. The underground pipe is filled with a conduction material, so that the pipe is corrosion-resistant, high-pressure-resistant and high-temperature-resistant, and the service life of the system is longer.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic structural diagram of the preferred embodiment of the present invention.
In the figure: 1. the device comprises an air compressor, 2, a valve, 3, an injection pipe, 4, a first working medium, 5, a first conduction isolating material, 6, a heat exchange fracturing well hole, 7, a shallow rock body, 8, a second conduction isolating material, 9, a second working medium, 10, a discharge pipe, 11, an air pump, 12, a valve, 13, a valve, 14, a fifth working medium, 15, an underground coal mine, 16, an air pump, 17, a valve, 18, a second heat exchanger, 19, a third working medium, 20, an air pump, 21, a valve, 22, a first heat exchanger, 23, a fourth working medium, 24, a valve, 25, a mixed air box, 26, a low boiling point working medium, 27 and a sixth working medium.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
As shown in figure 1, the fracturing single-well multi-branch compressed air energy storage and ventilation system for the coal mine comprises a fracturing single-well multi-branch well heat exchange system, an underground ventilation heat exchange system and a low-boiling point working medium heat exchange system, wherein the fracturing single-well multi-branch heat exchange system is connected with the underground ventilation heat exchange system through a pipeline with a certain diameter and is provided with a mixed air box 25, a working medium four 23 after heat exchange and temperature rise through a heat exchanger I22 and a working medium two 9 after heat exchange and temperature rise through the fracturing single-well multi-branch heat exchange system are fully mixed in the mixed air box 25 and then are sent into an underground coal mine 15, and a working medium five 14 is finally discharged to the atmosphere through a heat exchanger at the tail end of the underground ventilation heat exchange system by.
The fracturing single-well multi-branch heat exchange system adopts the following implementation mode: 1. according to the geological exploration result, shallow rock bodies (such as granite, metamorphic rock and the like) with proper positions and compact texture are selected, and a plurality of wells (5-8 wells) required by construction are constructed at the positions according to the required heat exchange quantity and the well diameter, the well depth and the well spacing calculated by the geothermal gradient.
2. The ends of a plurality of wells (4-7 wells) located on the periphery are in fracture communication with the ends of one well located in the middle position, and a heat exchange fractured well hole 6 is formed in the communication.
3. And (3) installing
4. And a
5. And injecting the working medium amount required by the working medium I4 and the working medium II 9 calculated according to the required heat exchange amount into the
6. The top of the injection system is connected with an air compressor 1 and a valve 2, and the tail end of the discharge system is connected with the underground ventilation and heat exchange system and is provided with a mixing air box 25, a valve 12 and an air pump 11.
The underground ventilation heat exchange system comprises
In the low-boiling point working medium heat exchange system, a low-boiling point working medium 26 circulates between the
The working process is as follows:
the working medium I4 enters the
The air extracted from the coal mine 15 has high temperature of about 12 ℃, and is extracted by an air extraction pump 16 and then subjected to waste heat recovery by a second heat exchanger 18. The method comprises the following steps: and sending the low-boiling-point working medium 26 into the second heat exchanger 18 to exchange heat with air pumped out from the coal mine 15, so that the temperature of the air is reduced and the temperature of the low-boiling-point working medium 26 is increased. Finally, the heat of the working medium 26 with the low boiling point is transferred to cold air at the coal mine inlet through the
Directions and references (e.g., up, down, left, right, etc.) may be used in the present disclosure only to aid in the description of features in the figures. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
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