CN110630311B - Multi-branch double-horizontal-well compressed air energy storage ventilation system for coal mine - Google Patents
Multi-branch double-horizontal-well compressed air energy storage ventilation system for coal mine Download PDFInfo
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- 238000009423 ventilation Methods 0.000 title claims abstract description 43
- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000004146 energy storage Methods 0.000 title claims abstract description 12
- 238000002347 injection Methods 0.000 claims description 34
- 239000007924 injection Substances 0.000 claims description 34
- 239000011435 rock Substances 0.000 claims description 21
- 238000009835 boiling Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000002918 waste heat Substances 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010438 granite Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
- E21F1/085—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators using compressed gas injectors
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F3/00—Cooling or drying of air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Road Paving Structures (AREA)
Abstract
The invention provides a multi-branch double-horizontal well compressed air energy storage ventilation system for a coal mine, which relates to the technical field of underground heat energy heat exchange and ventilation. The invention mainly solves the problems of inconvenient construction, failure to achieve the expected heat exchange effect, fund waste, serious influence on underground construction of the coal mine and safety of mine workers caused by large volume of the heat pump heat exchange unit used in the underground ventilation system of the coal mine, long-term outdoor damage of the machine and the like, and is more economic and environment-friendly.
Description
Technical Field
The invention relates to the technical field of underground heat energy heat exchange and ventilation, in particular to a compressed air energy storage heat exchange and ventilation system for a coal mine.
Background
In the coal mining process, harmful gas in the coal mine can be increased along with deepening of the coal mine, and fresh air is required to be continuously injected to ensure the life safety of workers working in the coal mine. In winter, the underground temperature of the coal mine is lower, fresh air reaching the temperature acceptable by human bodies needs to be injected, and the ground heat pump and the heat exchanger can meet the heat exchange requirement, but the problems of large volume, difficult construction, easy damage of the machine after being placed outdoors for a long time, failure to reach the expected heat exchange temperature and the like exist.
Geothermal resources are renewable clean energy sources with great influence, and have the advantages of stability, no influence of day-night temperature difference and seasonal temperature, higher utilization rate, safe use, low running cost and the like, and are very friendly to the environment.
The geothermal energy reserves in China are relatively rich, the total storage accounts for about 7.9% of the global geothermal energy reserves, and the energy which can be exploited and utilized is equivalent to 4626.5 hundred million t standard coal.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems that a heat pump heat exchanger used in an underground coal mine heat exchange ventilation system in the prior art is large in size, construction is inconvenient, expected heat exchange effect cannot be achieved, fund is wasted, underground coal mine construction is seriously affected, safety of mine workers is seriously affected and the like due to the fact that machines are easy to damage, the invention provides the multi-branch double-horizontal-well compressed air energy storage ventilation system for the coal mine.
The technical scheme adopted for solving the technical problems is as follows: the multi-branch double-horizontal well compressed air energy storage ventilation system for the coal mine comprises a multi-branch double-horizontal well heat exchange system, an underground ventilation heat exchange system and a low-boiling-point working medium heat exchange system, wherein the multi-branch double-horizontal well heat exchange system and the low-boiling-point working medium heat exchange system are connected with the underground ventilation heat exchange system through a mixing bellows,
the multi-branch double-horizontal-well heat exchange system is used for heating cold air in natural environment compressed by the air compressor, the temperature of the cold air reaches more than 20 ℃ after the cold air is heated by the multi-branch double-horizontal-well heat exchange system, and a large amount of heated compressed air is stored by utilizing underground space;
the low-boiling point working medium heat exchange system is used for utilizing the return air waste heat of the return air well, the system can utilize the heat exchanger to transfer the return air waste heat into the low-boiling point working medium, and then the heated low-boiling point working medium is pumped into another heat exchanger, and the heat exchanger is also used for heating cold air from natural environment, so that the utilization of the return air waste heat is realized;
the underground ventilation heat exchange system is a main system for mine ventilation, and the system sends the hot air heated by the multi-branch double-horizontal-well heat exchange system and the low-boiling-point working medium heat exchange system into a mine through an air supply well and then discharges the hot air from an air return well so as to meet the production requirement of the mine;
the multi-branch double-horizontal-well heat exchange system is connected with the underground ventilation heat exchange system through a pipeline with a certain diameter, a mixed bellows is arranged, the working medium which flows through the heat exchanger of the low-boiling-point working medium heat exchange system and is subjected to heat exchange and temperature rise is fully mixed with the working medium which flows through the multi-branch double-horizontal-well heat exchange system and is subjected to heat exchange and temperature rise in the mixed bellows, and then the mixed working medium is sent into an underground coal mine, and finally is discharged to the atmosphere at a proper temperature through the tail end heat exchanger of the underground ventilation heat exchange system.
Further, the multi-branch double-horizontal well heat exchange system comprises three subsystems, wherein the three subsystems comprise an injection system, a heat exchange system and a discharge system, and 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 bellows.
The injection system comprises an air compressor, a valve, an injection pipe, a first conduction isolation material and a first working medium; the heat exchange system includes a shallow rock body and a heat exchange branch wellbore; the exhaust system comprises an exhaust pipe, a second conduction-isolating material and a second working medium; the first conduction isolating material is filled between the outer wall of the injection pipe and the shallow rock body, the second conduction isolating material is filled between the outer wall of the discharge pipe and the shallow rock body, the tail ends of the injection pipe and the discharge pipe are both positioned in the shallow rock body, and the tail ends are communicated through a heat exchange branch well hole; the external working medium is injected into the injection pipe through the valve and the air compressor to form a working medium I, and the working medium I flows through the heat exchange branch hole to perform heat exchange and is discharged into the discharge pipe to form a working medium II.
The design of the multi-branch double-horizontal well heat exchange system adopts the following scheme:
step 1: according to geological exploration results, shallow rock bodies (such as granite, metamorphic rock and the like) with proper positions and compact textures are selected, and two wells are constructed at the positions according to the required heat exchange quantity, the well diameter calculated by geothermal gradients, the well depth and the well spacing.
Step 2: a U-shaped communication is established between the end of one well and the end of the other well, and a plurality of equidistant branch wellbores are built between the upper end and the lower end of the communication place, so as to form a plurality of heat exchange branch wellbores.
Step 3: an injection system is established, an injection pipe is installed in one well, and the first isolation conductive material is filled.
Step 4: and (3) establishing a discharge system, installing a discharge pipe in the other well, and filling the second conductive material.
Step 5: the injection system is connected with the ground through a pipeline and is provided with an air compressor and a valve, and the discharge system is connected with the underground ventilation and heat exchange system through a pipeline with a certain diameter and is provided with a blower, a valve and a mixed bellows.
Further, the underground ventilation and heat exchange system comprises a first blower, a second blower, a third blower, a first heat exchanger, a second heat exchanger, a mixed bellows, a third working medium, a fourth working medium, a fifth working medium and a sixth working medium, wherein the first blower is arranged at the outlet end of the discharge pipe and pumps the second working medium into the mixed bellows; the inlet end of the first heat exchanger is connected with the third air blower, and a valve is arranged between the inlet end and the third air blower; the outlet end of the first heat exchanger is connected with the mixed air box, a valve is arranged between the outlet end of the first heat exchanger and the mixed air box, and a working medium IV is formed between the first heat exchanger and the mixed air box; the mixed bellows is connected with the initial end of the underground coal mine well through a pipeline, and a valve is arranged on the pipeline between the mixed bellows and the initial end of the underground coal mine well; the second heat exchanger is connected with the tail end of the underground coal mine through the second air blower, and a valve is arranged on a pipeline between the second heat exchanger and the second air blower; the third air blower is used for inputting a third working medium, the third working medium is mixed with the fourth working medium through the first heat exchanger to form a fifth working medium, the fifth working medium is discharged through the second air blower and the second heat exchanger to form a sixth working medium, and the sixth working medium is discharged to the atmosphere after being ventilated through a mine.
Specifically, in the low boiling point working medium heat exchange system, low boiling point working medium circulation is arranged between the first heat exchanger and the second heat exchanger.
The beneficial effects of the invention are as follows: the multi-branch double-horizontal-well compressed air energy storage ventilation system for the coal mine provided by the invention has the following advantages:
1. energy is saved, and shallow geothermal energy is fully utilized;
2. the ground space is saved, the appearance is neat and beautiful, and the damage is not easy to occur;
3. the well diameter is smaller, so that the ground construction is not influenced;
4. the heat exchange capacity is effectively improved, so that the heat exchange working medium reaches the required heat exchange temperature;
5. the working media with different temperatures are fully mixed in the mixing bellows, so that the heat exchange speed is improved, and the service life of the system is prolonged;
6. the underground pipe is externally filled with conductive material, 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 described below with reference to the drawings and examples.
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a diagram of a multi-branch dual horizontal well compressed air energy storage ventilation system for a coal mine according to the present invention.
In the figure: 1-air compressor, 2-valve, 3-injection pipe, 4-working medium I, 5-conduction isolation material I, 6-heat exchange branch well hole, 7-shallow rock body, 8-conduction isolation material II, 9-working medium II, 10-discharge pipe, 11-blower I, 12-valve, 13-valve, 14-working medium V, 15-underground coal mine, 16-blower II, 17-valve, 18-heat exchanger II, 19-working medium III, 20-blower III, 21-valve, 22-heat exchanger I, 23-working medium IV, 24-valve, 25-mixed bellows, 26-low boiling point working medium, and 27-six working mediums.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention.
As shown in fig. 1, the multi-branch double-horizontal-well compressed air energy storage ventilation system for the coal mine comprises a multi-branch double-horizontal-well heat exchange system, an underground ventilation heat exchange system and a low-boiling-point working medium heat exchange system, wherein the multi-branch double-horizontal-well heat exchange system and the low-boiling-point working medium heat exchange system are connected with the underground ventilation heat exchange system through a mixing bellows 25,
the multi-branch double-horizontal-well heat exchange system is used for heating cold air in natural environment compressed by the air compressor, the temperature of the cold air reaches more than 20 ℃ after the cold air is heated by the multi-branch double-horizontal-well heat exchange system, and a large amount of heated compressed air is stored by utilizing underground space;
the low-boiling point working medium heat exchange system is used for utilizing the return air waste heat of the return air well, the system can utilize the heat exchanger to transfer the return air waste heat into the low-boiling point working medium, and then the heated low-boiling point working medium is pumped into another heat exchanger, and the heat exchanger is also used for heating cold air from natural environment, so that the utilization of the return air waste heat is realized;
the underground ventilation heat exchange system is a main system for mine ventilation, and the system sends the hot air heated by the multi-branch double-horizontal-well heat exchange system and the low-boiling-point working medium heat exchange system into a mine through an air supply well and then discharges the hot air from an air return well so as to meet the production requirement of the mine; the multi-branch double-horizontal-well heat exchange system is connected with the underground ventilation heat exchange system through a pipeline with a certain diameter, a mixing bellows 25 is arranged, a working medium IV 23 which flows through a first heat exchanger 22 for heat exchange and temperature rise is fully mixed with a working medium II 9 which flows through the multi-branch double-horizontal-well heat exchange system for heat exchange and temperature rise in the mixing bellows 25 and then is sent into an underground coal mine 15, and a working medium V14 is finally discharged to the atmosphere through a tail end heat exchanger of the underground ventilation heat exchange system in a working medium VI 27 with a proper temperature.
The multi-branch double-horizontal well heat exchange system comprises three subsystems, wherein the three subsystems comprise an injection system, a heat exchange system and a discharge system, and 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 7; the discharge system is connected to the discharge end of the heat exchange system for feeding the heat exchanged working medium into the mixing bellows 25.
The injection system comprises an air compressor 1, a valve 2, an injection pipe 3, a conduction isolating material I5 and a working medium I4; the heat exchange system comprises a shallow rock body 7 and a heat exchange branch wellbore 6; the exhaust system comprises an exhaust pipe 10, a second conduction isolating material 8 and a second working medium 9; the first conduction isolating material 5 is filled between the outer wall of the injection pipe 3 and the shallow rock body 7, the second conduction isolating material 8 is filled between the outer wall of the discharge pipe 10 and the shallow rock body 7, 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 ends are communicated through the heat exchange branch hole 6; the external working medium is injected into the injection pipe 3 through the valve 2 and the air compressor 1 to form a working medium I4, and the working medium I4 flows through the heat exchange branch hole 6 to be subjected to heat exchange and then is discharged into the discharge pipe 10 to form a working medium II 9.
The multi-branch double-horizontal well heat exchange system adopts the following implementation modes:
1. according to geological exploration results, a shallow rock body 7 (such as granite, metamorphic rock and the like) with a proper position and compact texture is selected, and two wells are constructed at the position according to the required heat exchange amount, the well diameter calculated by geothermal gradients, the well depth and the well spacing.
2. A U-shaped communication is established between the end of one well and the end of the other well, and a plurality of equally spaced branch wellbores are formed between the upper and lower ends of the communication to form a plurality of heat exchange branch wellbores 6.
3. A well is selected, an injection pipe 3 is installed in the well, cement reinforcement is carried out, and the outside of the injection pipe 3 is filled with a conduction-isolating material 5 to form an injection system.
4. And installing a discharge pipe 10 in the other well, and performing cement reinforcement, wherein the discharge pipe 10 is filled with a second conductive material 8 to form a discharge system.
5. The working media of the working medium I4 and the working medium II 9 calculated according to the required heat exchange amount are injected into the injection pipe 3, the discharge pipe 10 and the heat exchange branch well hole 6 at one time.
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 bellows 25, a valve 12 and a blower 11.
The underground ventilation and heat exchange system comprises a first blower 11, a second blower 16, a third blower 20, a first heat exchanger 22, a second heat exchanger 18, a mixed air box 25, a third working medium 19, a fourth working medium 23, a fifth working medium 14 and a sixth working medium 27, wherein the first blower 11 is arranged at the outlet end of the discharge pipe 10 and pumps the second working medium 9 into the mixed air box 25, and a valve 12 is arranged on a pipeline between the mixed air box 25 and the first blower 11; the inlet end of the first heat exchanger 22 is connected with the third blower 20, and a valve 21 is arranged between the inlet end and the third blower; the outlet end of the first heat exchanger 22 is connected with a mixing bellows 25, a valve 24 is arranged between the outlet end of the first heat exchanger and the mixing bellows 25, and a working medium IV 23 is formed between the first heat exchanger 22 and the mixing bellows 25; the mixing bellows 25 is connected with the initial end of the underground coal mine 15 through a pipeline, and a valve 13 is arranged on the pipeline between the mixing bellows and the underground coal mine 15; the second heat exchanger 18 is connected with the tail end of the underground coal mine 15 through the second air blower 16, and a valve 17 is arranged on a pipeline between the second heat exchanger 18 and the second air blower 16; in the low-boiling point working medium heat exchange system, a low-boiling point working medium 26 circulates between the first heat exchanger 22 and the second heat exchanger 18.
The working medium I4 flows to the heat exchange branch hole 6 through the injection pipe 3 of the air compressor 1, the working medium II 9 enters the discharge pipe 10 through the heat exchange and temperature rise of the shallow rock 7, the working medium II 9 enters the mixing bellows 25 through the blower 11, the working medium III 19 enters the heat exchanger I22 through the blower 20, the heat exchange and temperature rise of the working medium IV 23 enters the mixing bellows 25, the working medium IV 23 and the working medium II 9 are fully mixed in the mixing bellows 25 to become the working medium IV 14, and then the working medium IV is injected into the underground coal mine 15, the working medium IV 14 flows to the tail end of the underground coal mine 15, and enters the heat exchanger II 18 through the blower 16, the heat exchange and the temperature rise of the working medium IV 27 are changed.
The invention adopts the principle of geothermal compressed air energy storage to solve the outstanding problems that the traditional air source heat pump for mine ventilation in winter has high heating energy consumption, the heating of a coal-fired boiler is not energy-saving, the pollutant emission exceeds the standard and the like. The geothermal resource is a main heat source for ventilation and heating of coal mine, and the geothermal energy can be transferred into mine ventilation by using the system so as to meet the requirement of the mine ventilation on temperature in winter. While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (2)
1. The utility model provides a colliery is multi-branch two horizontal well compressed air energy storage ventilation system for well which characterized in that: comprises a multi-branch double-horizontal well heat exchange system, an underground ventilation heat exchange system and a low boiling point working medium heat exchange system, wherein the multi-branch double-horizontal well heat exchange system and the low boiling point working medium heat exchange system are connected with the underground ventilation heat exchange system through a mixing bellows,
the multi-branch double-horizontal well heat exchange system is used for heating cold air in natural environment after being compressed by the air compressor,
the low boiling point working medium heat exchange system is used for utilizing return air waste heat of a return air well;
the underground ventilation heat exchange system is a main system for mine ventilation, and the system sends the hot air heated by the multi-branch double-horizontal-well heat exchange system and the low-boiling-point working medium heat exchange system into a mine through an air supply well and then discharges the hot air from an air return well;
the working medium subjected to heat exchange and temperature rise through the low boiling point working medium heat exchange system and the working medium subjected to heat exchange and temperature rise through the multi-branch double-horizontal well heat exchange system are fully mixed in the mixed bellows and then are sent into an underground coal mine in the underground ventilation heat exchange system, and the mixed working medium is subjected to heat exchange through a heat exchanger at the tail end of the underground ventilation heat exchange system and is discharged to the atmosphere;
the multi-branch double-horizontal well heat exchange system comprises three subsystems, wherein the three subsystems comprise an injection system, a heat exchange system and a discharge system, and 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 heat exchanged working medium into the mixing bellows;
the injection system comprises an air compressor, a valve, an injection pipe, a first conduction isolation material and a first working medium; the heat exchange system includes a shallow rock body and a heat exchange branch wellbore; the exhaust system comprises an exhaust pipe, a second conduction-isolating material and a second working medium; the first conduction isolating material is filled between the outer wall of the injection pipe and the shallow rock body, the second conduction isolating material is filled between the outer wall of the discharge pipe and the shallow rock body, the tail ends of the injection pipe and the discharge pipe are both positioned in the shallow rock body, and the tail ends are communicated through a heat exchange branch well hole; the external working medium is injected into the injection pipe through the valve and the air compressor to form a working medium I, and the working medium I flows through the heat exchange branch hole to perform heat exchange and is discharged into the discharge pipe to form a working medium II;
the underground ventilation heat exchange system comprises a first blower, a second blower, a third blower, a first heat exchanger, a second heat exchanger, a mixed bellows, a third working medium, a fourth working medium, a fifth working medium and a sixth working medium, wherein the first blower is arranged at the outlet end of the discharge pipe and pumps the second working medium into the mixed bellows; the inlet end of the first heat exchanger is connected with a third air blower; the outlet end of the first heat exchanger is connected with the mixed air box, and a working medium IV is formed between the first heat exchanger and the mixed air box; the mixed bellows is connected with the initial end of the underground coal mine well through a pipeline; the second heat exchanger is connected with the tail end of the underground coal mine through the second air blower; the third blower is used for inputting a third working medium, the third working medium passes through the first heat exchanger to form a fourth working medium, the fourth working medium is mixed with the second working medium and enters an underground coal mine well to form a fifth working medium, and the fifth working medium passes through the second blower and the second heat exchanger to form a sixth working medium to be discharged;
the low-boiling-point working medium heat exchange system is arranged between the first heat exchanger and the second heat exchanger, and the low-boiling-point working medium circulation is arranged in the low-boiling-point working medium heat exchange system;
the tail end of one well and the tail end of the other well in the multi-branch double-horizontal well are communicated in a U-shaped mode, a plurality of equidistant branch well bores are built between the upper end and the lower end of the communicating position, and a plurality of heat exchange branch well bores are formed.
2. The multi-branch dual horizontal well compressed air energy storage ventilation system for a coal mine of claim 1, wherein: and the working medium six is gas which is discharged to the atmosphere after mine ventilation.
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| CN201910838309.0A CN110630311B (en) | 2019-09-05 | 2019-09-05 | Multi-branch double-horizontal-well compressed air energy storage ventilation system for coal mine |
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