CN115751744A - Comprehensive exploitation system and exploitation method for geothermal resources in inner Mongolia region - Google Patents
Comprehensive exploitation system and exploitation method for geothermal resources in inner Mongolia region Download PDFInfo
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- CN115751744A CN115751744A CN202211252139.6A CN202211252139A CN115751744A CN 115751744 A CN115751744 A CN 115751744A CN 202211252139 A CN202211252139 A CN 202211252139A CN 115751744 A CN115751744 A CN 115751744A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 239
- 238000002347 injection Methods 0.000 claims abstract description 49
- 239000007924 injection Substances 0.000 claims abstract description 49
- 238000005065 mining Methods 0.000 claims abstract description 31
- 238000000605 extraction Methods 0.000 claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000005381 potential energy Methods 0.000 claims description 35
- 238000011084 recovery Methods 0.000 claims description 25
- 230000005611 electricity Effects 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 238000000746 purification Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000008236 heating water Substances 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010336 energy treatment Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000013529 heat transfer fluid Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a comprehensive exploitation system of geothermal resources in inner Mongolia areas, which comprises a deep geothermal exploitation system, an upper coal mine layer thermal exploitation system and an underground water replenishing system, wherein the deep geothermal exploitation system comprises a cold water injection well, a water return well and a thermal energy extraction device A which is communicated with the cold water injection well and the water return well on the ground; the upper coal mine layer heat energy mining system comprises a cold water injection pipe, low-temperature cold water conveyed by the cold water injection pipe is transferred to a mining system for dedusting and cooling, the cold water conveyed by the cold water injection pipe with relatively high temperature enters a goaf heat energy collecting system, the output end of the goaf heat energy collecting system is sequentially communicated with a water conveying pipe, a mine layer heat energy water return pipe and a ground heat energy extracting device B, and the heat energy extracting device B is connected with the cold water injection pipe after recovering heat energy; and the underground water replenishing system supplies water in the water-containing layer of the top bottom plate of the coal mine layer to the goaf heat energy acquisition system and the geothermal energy reservoir. The invention can improve the utilization rate of the whole resources and maximally improve the mining energy efficiency.
Description
Technical Field
The invention relates to the field of geothermal resource exploitation, in particular to a geothermal resource comprehensive exploitation system and an exploitation method, which are particularly suitable for inner Mongolia areas.
Background
Geothermal energy is a clean energy source which is renewable from the deep part of the earth and is brought to the ground surface for utilization in the form of hot water or steam by flowing underground water or other working media. Under the conditions of rapid economic development and daily shortage of energy, the rational development and utilization of geothermal resources are becoming more and more popular. The geothermal energy power generation is mainly realized, and meanwhile, utilization ways of directly utilizing geothermal water for building heating, developing greenhouse agriculture, hot spring travel and the like are rapidly developed. The traditional geothermal energy exploitation mode is that water is used as heat transfer fluid to realize circulation underground, enters a communicated fracture zone of artificial fracturing, is heated when contacting with a rock body, and then returns to the ground through a production well to form a closed loop; but the replenishment of clean circulating water has been a problem.
The inner Mongolia area has a certain amount of geothermal energy resources and also has a large amount of coal resources. In recent years, as the exploitation of coal resources is continuously promoted to the deep part, the problem of high ground temperature is caused, and in order to solve the exploitation problem caused by the high ground temperature, the coal-geothermal water collaborative exploitation becomes a hot research subject, but the filling exploitation process is usually adopted, so that the production efficiency is low and the cost is high; and the coal-coal bed geothermal energy-deep pure geothermal energy collaborative exploitation is not researched.
Disclosure of Invention
In order to solve the problem of cooperative mining of coal, coal bed geothermal energy and deep pure geothermal energy in inner Mongolia areas, the invention provides a geothermal resource comprehensive mining system which comprises a deep geothermal energy mining system, an upper coal bed thermal energy mining system and an underground water supplementing system, wherein the deep geothermal energy mining system comprises a cold water injection well, a water return well and a thermal energy extraction device A which is communicated with the cold water injection well and the water return well on the ground; the upper coal mine layer heat energy mining system comprises a cold water injection pipe, low-temperature cold water conveyed by the cold water injection pipe is transferred to a mining system for dedusting and cooling, the cold water conveyed by the cold water injection pipe with relatively high temperature enters a goaf heat energy collecting system, the output end of the goaf heat energy collecting system is sequentially communicated with a water conveying pipe, a mine layer heat energy water return pipe and a ground heat energy extracting device B, and the heat energy extracting device B is connected with the cold water injection pipe after recovering heat energy; and the underground water replenishing system is used for replenishing water in the water-containing layer of the top and bottom plates of the coal mine layer to the goaf heat energy collecting system and the geothermal energy storage layer.
Preferably, the cold water injection well and the water return well are communicated in the geothermal energy storage layer through artificial fracturing horizontal cracks.
Preferably, the cold water injection pipe is arranged in the main well or the auxiliary well, and the ore layer heat energy water return pipe is arranged in the air return well.
Preferably, the water return well is also connected with non-recyclable water and recyclable water on the ground, and the recyclable water output end is connected with the heat energy extraction device B.
Preferably, the heat energy extraction device B is connected with a cold water injection pipe after passing through the purification device B, and cold water with relatively high temperature after heat energy extraction is directly injected into the goaf heat energy acquisition system; and the low-temperature cold water cooled by the heat energy extraction device B through the multistage filtering cooling water pool and the cooling tower is injected into the cold water sump through the cold water injection pipe.
Preferably, a potential energy recovery device A is arranged at the lower part of the cold water injection well, and a potential energy recovery device B is arranged at the lower part of the cold water injection pipe.
Preferably, the low-temperature cold water enters the cold water sump and is transferred to the mining system through the power device A, and the power device B is used for extracting water in the water-containing layer of the top floor of the coal mine layer.
Preferably, the device further comprises an electricity storage and supply device, the potential energy recovery device A and the potential energy recovery device B convert the recovered potential energy into electric energy to be stored in the electricity storage and supply device, and the electricity storage and supply device supplies the electric energy to the power device A and the power device B.
Preferably, collecting system for goaf potential energy includes the cold water main pipe that advances as the input, a plurality of cold water branch pipes that advances that are located the return air tunnel bottom plate with advancing cold water union coupling, with advance the heating water pipe that is located the working face bottom plate that cold water branch pipe is connected, with the heating water pipe other end connection be located the haulage tunnel bottom plate backheat water branch pipe, a plurality of backheat water branch pipes are connected with the backheat water main pipe, the backheat water main pipe passes through raceway and return water pipe intercommunication as the output.
Preferably, the cold water branch pipe and the backheating water branch pipe are respectively embedded in the middle trend cutting groove of the return air roadway and the transportation roadway, the heat collecting water pipe is embedded in the drilling hole of the bottom plate of the working face, and the heat collecting water pipe is ahead of the periodic pressure coming top plate breaking position.
Has the advantages that: 1. the invention carries out the synergistic exploitation on the deep geothermal energy exploitation and the coal-heat co-exploitation of the deep coal seam for the first time. The lower geothermal energy exploitation system produces independently, so that the high cleanness of circulating water is ensured, and the blockage of a horizontal crack is avoided. The upper coal mine layer heat energy mining system directly inputs part of water after heat energy extraction to the goaf heat energy collecting system to form circulation, so that energy loss is reduced; meanwhile, the other part of water is subjected to multistage filtration and cooling and then is used for dedusting and cooling of the mining system, so that the problem of high mining temperature of a deep coal mine layer is solved, and the exploitation of heat energy of the deep coal mine layer is realized.
2. A geothermal resource composite system is constructed, part of hot water extracted by a lower geothermal energy extraction system is directly used for recyclable water, and then is connected with a heat energy extraction device B of a coal mine layer heat energy extraction system with relatively low requirement on cleanliness, and further extracted heat energy is used as the circulating water of a goaf heat energy extraction system; the water of the aquifer of the top floor of the coal mine layer is creatively provided as the replenishing water of the two circulating water utilization systems, so that deep underground water resources can be developed while deep coal-heat resources are developed, and the use of shallow surface water is reduced.
3. For the goaf heat energy treatment system, a heat collecting water pipe is creatively laid in a bottom plate of the goaf, and a scheme for avoiding periodic mine pressure is provided; the goaf heat energy treatment system does not need filling mining, greatly improves the mining efficiency and reduces the mining cost, and meanwhile, the cold water inlet branch pipe and the hot water return branch pipe are embedded in the running cutting grooves of two roadways of the working face, so that the problem of bottom heave in deep coal mining layers can be solved, and the embedding of the geothermal pipes can be realized.
Drawings
FIG. 1 is an integrated geothermal resource mining system according to the present invention;
FIG. 2 is a goaf heat energy collection system of the present invention;
in the figure: the system comprises a geothermal reservoir cold water injection well 1, a mineral layer heat water injection pipe 2, a mineral layer heat water return pipe 3, a geothermal reservoir water return well 4, a water delivery pipe 5, a geothermal reservoir 6, a horizontal crack 61, a power transmission line 7, a cold water inlet main pipe 81, a hot water return main pipe 82, a cold water inlet branch pipe 83, a hot water return branch pipe 84, a hot water recovery pipe 85 and a periodic incoming pressure roof fracture position 86.
Detailed Description
As shown in fig. 1-2, a geothermal resource comprehensive exploitation system, especially suitable for inner Mongolia area, comprises a deep geothermal energy exploitation system, wherein the deep geothermal energy exploitation system comprises a cold water injection well 1 and a water return well 4 which are constructed from the ground to a geothermal energy reservoir 6, and an artificial fracturing horizontal crack 61 which is positioned in the geothermal energy reservoir 6 and is communicated with the cold water injection well 1 and the water return well 4, and a potential energy recovery device A is arranged at the lower part of the cold water injection well 1; the water return well 4 is connected with the heat energy extraction device A on the ground, the other end of the heat energy extraction device A is connected with the cold water injection well 1, and the water return well 4 is also connected with non-recyclable water (such as direct water for daily life and direct water for factory production) and recyclable water (such as water for household floor heating) on the ground for direct use;
the mining system comprises a cold water injection pipe 2 positioned in a main well or an auxiliary well and a potential energy recovery device B positioned at the lower part of the main well or the auxiliary well and connected with the cold water injection pipe 2, wherein low-temperature cold water of which the potential energy is recovered by the potential energy recovery device B enters a cold water sump, and then the low-temperature cold water in the cold water sump is conveyed to a mining system through a power device A for dust removal and temperature reduction; cold water with relatively high temperature after potential energy is recovered by the potential energy recovery device B enters the goaf heat energy collection system; the mine water burst is also communicated with the input end of a goaf heat energy acquisition system after being purified by the purification device A, and the output end of the goaf heat energy acquisition system is communicated with a mineral layer heat energy return pipe 3 positioned in a return air well through a water conveying pipe 5; the mine heat energy return pipe 3 is connected with a heat energy extraction device B on the ground, the heat energy extraction device B is connected with a cold water injection pipe 2 after passing through a purification device B, and cold water with relatively high temperature after heat energy extraction is directly injected into a goaf heat energy acquisition system; the low-temperature cold water cooled by the heat energy extraction device B through the multistage filtering cooling water pool and the cooling tower is injected into the cold water sump through the cold water injection pipe 2;
the system also comprises a geothermal resource compound system, wherein the output end of the recyclable water (such as household floor heating water) is connected with the heat energy extraction device B; and secondly, an underground water replenishing system is arranged, a power device B is adopted to extract water in the water-containing layer of the top bottom plate of the coal mine layer and replenish the water to a goaf heat energy collecting system, and meanwhile, the potential energy recovery device A supplies the water to a geothermal energy storage layer 6 through a cold water injection well 1. The potential energy recovery device A and the potential energy recovery device B convert the recovered potential energy into electric energy to be stored in the electricity storage and supply equipment, and the electricity storage and supply equipment supplies the electric energy to the power device A, the power device B and other equipment.
The goaf potential energy acquisition system comprises a cold water inlet main pipe 81 serving as an input end, a plurality of cold water inlet branch pipes 83 connected with the cold water inlet pipe 81 and positioned in a return air roadway bottom plate, a heating water pipe 85 connected with the cold water inlet branch pipes 83 and positioned in a working face bottom plate, a back heating water branch pipe 84 connected with the other end of the heating water pipe 85 and positioned in a transport roadway bottom plate, and a plurality of back heating water branch pipes 84 connected with the back heating water main pipe 82, wherein the back heating water main pipe 82 serves as an output end and is communicated with a water return pipe 3 through a water conveying pipe 5; the cold water branch pipe 83 and the backheating water branch pipe 84 are respectively embedded in the middle trend cutting grooves of the return air roadway and the transportation roadway, and the problem of roadway floor heave can be relieved due to the cutting grooves formed in the middle of the roadway; the hot water production pipe 85 is embedded in a drill hole in the bottom plate of the working face, and the hot water production pipe 85 is about 3-5m ahead of the periodic top plate pressing breaking position 86.
The use method of the comprehensive geothermal resource exploitation system comprises the following steps: s1, constructing a deep geothermal energy exploitation system, constructing a cold water injection well 1 and a water return well 4 from the ground to a geothermal energy reservoir 6, artificially cracking a horizontal crack 61 communicating the cold water injection well 1 and the water return well 4 in the geothermal energy reservoir 6, constructing a well cave containing a potential energy recovery device A downwards from a main well or an auxiliary well, and connecting the potential energy recovery device A with the lower part of the cold water injection well 1;
the method comprises the following steps of connecting a water return well 4 with a heat energy extraction device A on the ground, connecting the other end of the heat energy extraction device A with a cold water injection well 1, and connecting the water return well 4 with non-recyclable water (such as direct water for daily life and direct water for factory production) and recyclable water (such as water for household floor heating) on the ground for direct use;
s2, constructing an upper coal mine layer heat energy mining system, paving a cold water injection pipe 2 in a main well or a subline of a coal mine layer, constructing an underground chamber at the bottom of the main well or the subline, installing a potential energy recovery device B connected with the cold water injection pipe 2 in the underground chamber, inputting low-temperature cold water subjected to potential energy recovery by the potential energy recovery device B into a cold water sump through a water delivery pipe, and then delivering the low-temperature cold water in the cold water sump to a mining system through a power device A for dust removal and temperature reduction;
inputting cold water with relatively high temperature after potential energy is recovered by the potential energy recovery device B into a goaf heat energy collection system; the mine water burst is purified by the purification device A and then is communicated with the input end of the goaf heat energy collection system, the goaf heat energy collection system heats the input water, and the output end of the goaf heat energy collection system is communicated with a mine layer heat energy water return pipe 3 in a return air well through a water conveying pipe 5;
connecting a mine layer heat energy return pipe 3 with a heat energy extraction device B on the ground, connecting the heat energy extraction device B with a cold water injection pipe 2 after passing through a purification device B, and directly injecting cold water with relatively high temperature after heat energy extraction into a goaf heat energy acquisition system; the water part of the heat energy extracted by the heat energy extraction device B is cooled by a multistage filtering cooling water pool and a cooling tower, and is changed into low-temperature cold water which is then injected into a cold water sump through a cold water injection pipe 2;
s3, constructing a geothermal resource composite system, connecting the output end of the recyclable water with a heat energy extraction device B, further extracting heat energy, and then communicating a multi-stage filtering cooling water tank and a purification device B;
and (3) constructing an underground water replenishing system, extracting water in the water-containing layer of the top bottom plate of the coal mine layer by adopting a power device B to replenish the water to a goaf heat energy acquisition system, and simultaneously replenishing the extracted water to a geothermal energy storage layer 6 through a cold water injection well 1 by virtue of a potential energy recovery device A.
And S4, constructing a power supply auxiliary system, converting potential energy recovered by the potential energy recovery device A and the potential energy recovery device B into electric energy, storing the electric energy in the electricity storage and power supply equipment, and supplying the electric energy to the power device A, the power device B and other equipment by the electricity storage and power supply equipment.
The goaf potential energy collection system comprises a cold water inlet main pipe 81 serving as an input end, a plurality of cold water inlet branch pipes 83 connected with the cold water inlet pipe 81 and positioned in a return air roadway bottom plate, a hot water production pipe 85 connected with the cold water inlet branch pipes 83 and positioned in a working face bottom plate, a hot water return branch pipe 84 connected with the other end of the hot water production pipe 85 and positioned in a transport roadway bottom plate, and a plurality of hot water return branch pipes 84 connected with the hot water return main pipe 82, wherein the hot water return main pipe 82 serving as an output end is communicated with a water return pipe 3 through a water conveying pipe 5; during working face mining, grooves are formed in the middle of a return air roadway and a transportation roadway, cold water branch pipes 83 and backheating water branch pipes 84 are respectively embedded in the grooves, holes are drilled in the bottom plate of the working face in advance, heat production water pipes 85 are embedded in the bottom plate of the working face, and the heat production water pipes 85 are embedded in the periodic top plate breaking positions 86 which are 3-5m ahead.
Claims (9)
1. A comprehensive exploitation system of geothermal resources in inner Mongolia areas is characterized by comprising a deep geothermal energy exploitation system, an upper coal mine layer thermal energy exploitation system and an underground water replenishing system, wherein the deep geothermal energy exploitation system comprises a cold water injection well, a water return well and a thermal energy extraction device A which is communicated with the cold water injection well and the water return well on the ground; the upper coal mine layer heat energy mining system comprises a cold water injection pipe, low-temperature cold water conveyed by the cold water injection pipe is transferred to a mining system for dedusting and cooling, the cold water conveyed by the cold water injection pipe with relatively high temperature enters a goaf heat energy collecting system, the output end of the goaf heat energy collecting system is sequentially communicated with a water conveying pipe, a mine layer heat energy water return pipe and a ground heat energy extracting device B, and the heat energy extracting device B is connected with the cold water injection pipe after recovering heat energy; and the underground water replenishing system supplies water in the water-containing layer of the top bottom plate of the coal mine layer to the goaf heat energy acquisition system and the geothermal energy reservoir.
2. The comprehensive geothermal resource mining system of claim 1, wherein the cold water injection well and the water return well are communicated through an artificially fractured horizontal fracture in the geothermal energy storage layer.
3. The comprehensive geothermal resource exploitation system of claim 1, wherein the backwater well is further connected to the non-recyclable water and the recyclable water at the surface, and the recyclable water output terminal is connected to the thermal energy extraction device B.
4. The comprehensive geothermal resource mining system according to claim 1, wherein the heat energy extraction device B is connected to a cold water injection pipe after passing through the purification device B, and cold water at a relatively high temperature after heat energy extraction is directly injected into the goaf heat energy collection system; and low-temperature cold water cooled by the heat energy extraction device B through the multistage filtering cooling water tank and the cooling tower is injected into the cold water sump through the cold water injection pipe.
5. The comprehensive geothermal resource exploitation system of claim 1 or 4, wherein a potential energy recovery device A is disposed at a lower portion of the cold water injection well, and a potential energy recovery device B is disposed at a lower portion of the cold water injection pipe.
6. The comprehensive geothermal resource mining system according to claim 5, wherein the cold water at low temperature is transferred to the mining system through a power device A after entering the cold water sump, and water in the water-containing layer of the top floor of the coal mine layer is extracted by a power device B.
7. The comprehensive geothermal resource exploitation system of claim 6, further comprising an electricity storage and supply device, wherein the potential energy recovery device A and the potential energy recovery device B convert the recovered potential energy into electric energy to be stored in the electricity storage and supply device, and the electricity storage and supply device supplies the electric energy to the power device A and the power device B.
8. The comprehensive geothermal resource mining system according to claim 1 or 4, wherein the goaf potential energy collection system comprises a main cold water inlet pipe as an input end, a plurality of cold water inlet branch pipes connected with the cold water inlet pipe and located in a bottom plate of the return air roadway, a hot water inlet pipe connected with the cold water inlet branch pipes and located in a bottom plate of the working face, a branch hot water return pipe connected with the other end of the hot water inlet pipe and located in a bottom plate of the transport roadway, and a plurality of branch hot water return pipes connected with the main hot water return pipe, wherein the main hot water return pipe is communicated with a water return pipe as an output end through a water conveying pipe.
9. The comprehensive geothermal resource exploitation system of claim 8, wherein the cold water branch pipe and the hot water branch pipe are embedded in the middle run-out slots of the return air roadway and the haulage roadway, respectively, and the hot water pipes are embedded in the holes of the floor of the working face, and the hot water pipes are ahead of the periodic pressure roof breaking position.
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Inventor after: Yuan Junhong Inventor after: Wang Feng Inventor after: Chang Jianmei Inventor after: Qiu Jiaohui Inventor after: Nan Xuelan Inventor after: Wu Tunasheng Inventor before: Yuan Junhong Inventor before: Qiu Jiaohui Inventor before: Nan Xuelan Inventor before: Wang Feng Inventor before: Wu Tunasheng |