CN111721013B - Deep mine hydrothermal type geothermal energy circulation and coal seam collaborative mining system - Google Patents
Deep mine hydrothermal type geothermal energy circulation and coal seam collaborative mining system Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 78
- 238000005065 mining Methods 0.000 title claims abstract description 68
- 238000000605 extraction Methods 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000010336 energy treatment Methods 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 8
- 230000001174 ascending effect Effects 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
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- 238000013461 design Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000003809 water extraction Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 7
- 238000011161 development Methods 0.000 description 6
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- 208000010392 Bone Fractures Diseases 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- E21—EARTH OR ROCK DRILLING; MINING
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- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses a deep mine hydrothermal type geothermal energy circulation and coal bed collaborative mining system, wherein a geothermal energy circulation mining system is additionally arranged on the coal bed mining system to form a thermal-coal collaborative mining system, and the system specifically comprises: the method comprises the steps of performing gob-side entry retaining during stoping of a working face, and performing process drilling for heat energy extraction and cold water recharge storage to an adjacent aquifer in the gob-side entry retaining, wherein the process drilling comprises extraction drilling holes and recharge drilling holes, transportation pipelines are arranged in the drilling holes, a heat energy extraction pipeline laid in the gob-side entry of the N # working face and a cold water recharge pipeline laid in the gob-side entry of the 1# working face are correspondingly formed, the heat energy extraction pipeline and the cold water recharge pipeline are both connected to a heat energy processing station on the ground to form a geothermal energy circulating mining system, and N is the mining quantity of the coal seam working face. The invention can realize comprehensive, coordinated and green exploitation of deep mine hydrothermal geothermal energy and coal resources, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of mine energy exploitation, and particularly relates to a deep mine hydrothermal geothermal energy circulation and coal bed collaborative exploitation system which is particularly suitable for clean exploitation and cyclic utilization of deep mine hydrothermal geothermal energy.
Background
Coal is a main energy source in China, shallow coal resources in the eastern area of China are nearly exhausted, but deep coal resources are relatively rich, but deep mining is affected by disturbance of four high and one high, mine disasters are frequent, mining equipment requirements are high, mining difficulty is high, mine production cost is increased, and efficient production and mining area environment collaborative development of deep mines are severely restricted. The influence of factors such as technology, economy and safety is comprehensively considered, and after deep mining, only mining coal resources is not beneficial to green mine construction of deep mines, energy conservation and emission reduction of coal enterprises and multi-economic comprehensive development.
The geothermal energy is a renewable clean energy with green, low carbon and recycling, has the characteristics of large reserves, wide distribution, cleanness, environmental protection, stability, reliability and the like, and is a practical, feasible and competitive clean energy. The geothermal resources in China are rich, and the temperature of surrounding rocks at the vertical depth of 1000m of a mine can reach 35-45 ℃ according to the calculation of normal geothermal gradient. According to the data of 2015 year of the national resource department, the geothermal resource amount is about 4900 trillion tons of standard coal within 5km of the world, and about 1/6 of China, wherein the storage amount of the medium-deep hydrothermal geothermal energy resource is about 13700 trillion tons of standard coal, so the development and utilization potential is huge.
The existing hydrothermal geothermal energy development modes are mainly divided into two types, the first type is a mode of taking heat without taking water, the first type comprises the exploitation by depending on a heat conduction buried pipe type and depending on a heat exchanger of convection heat exchange, and the second type is a mode of directly exploiting geothermal fluid to develop geothermal heat. The direct exploitation of geothermal fluid is a geothermal exploitation method with the highest heat power, the traditional geothermal energy exploitation is mainly realized by a ground drilling mode, but the drilling cost is high, the aquifer crack is easy to compact and close under the high stress condition, and cold water is not easy to recharge, so that the exploitation period and the exploitation efficiency are low. Therefore, when the deep coal seam is mined, the existing underground working face, tunnel and other pressure relief spaces are utilized to arrange the aquifer geothermal energy extraction equipment and system, so that the problem of low economic benefit caused by independent coal mining can be solved, the clean geothermal energy resources can be efficiently mined, and the method has better economy.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a deep mine hydrothermal geothermal energy circulation and coal bed collaborative mining system, when a deep coal bed is mined, aquifer geothermal energy extraction equipment and system are arranged by utilizing the existing pressure relief spaces such as an underground working face, a tunnel and the like, so that the problem of low economic benefit caused by coal mining alone can be solved, clean geothermal energy resources can be mined efficiently, and the deep mine hydrothermal geothermal energy circulation and coal bed collaborative mining system has better economic performance.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a deep mine hydrothermal type geothermal energy circulation and coal seam collaborative mining system is characterized in that a geothermal energy circulation mining system is additionally arranged on a coal seam mining system to form a heat-coal collaborative mining system, and the system specifically comprises: the method comprises the steps of performing gob-side entry retaining during stoping of a working face, and performing process drilling for heat energy extraction and cold water recharge storage to an adjacent aquifer in the gob-side entry retaining, wherein the process drilling comprises extraction drilling holes and recharge drilling holes, transportation pipelines are arranged in the drilling holes, a heat energy extraction pipeline laid in the gob-side entry of the N # working face and a cold water recharge pipeline laid in the gob-side entry of the 1# working face are correspondingly formed, the heat energy extraction pipeline and the cold water recharge pipeline are both connected to a heat energy processing station on the ground to form a geothermal energy circulating mining system, and N is the mining quantity of the coal seam working face.
Further, the hydrothermal geothermal energy extraction and storage specific process comprises the following steps:
(a) the extraction process comprises the following steps: the heat energy extraction pipeline is laid in the gob-side roadway of the N # working face, hydrothermal geothermal energy is lifted to a heat energy treatment station from a water-bearing layer (7) through the heat energy extraction pipeline sequentially through the gob-side roadway, the rail ascending mountain, the rail large roadway, the parking lot and an auxiliary well conveying pipeline, and is changed into cold water through cyclic utilization to wait for next system circulation;
(b) the storage process comprises the following steps: cold water discharged by the heat energy treatment station sequentially passes through an auxiliary well, a parking lot, a large track roadway and a track ascending mountain, is injected into a water-bearing stratum through a cold water recharging pipeline laid along a vacant roadway on the No. 1 working face, and is extracted and utilized next time after the heat conduction action of a high-temperature rock mass.
Further, the distance between the extraction drill hole and the recharge drill hole satisfies the following formula:
(N-1)×d≥L (1)
n is the mining quantity of the coal seam working face, d is the width of the single coal seam working face, and L is the distance between the extraction drill hole and the recharge drill hole along the direction of the working face.
Has the advantages that: compared with the prior art, the invention has the following advantages: the invention relates to a deep mine hydrothermal geothermal energy circulation and coal bed collaborative mining system, which is characterized in that when a coal mine is mined, according to the occurrence characteristics of an adjacent hydrothermal water-bearing layer and according to mining and arrangement conditions of a coal bed working face, extraction and recharge pipelines are reasonably arranged in a working face roadway to form a mining circulation system with a ground heat energy treatment station, so that clean geothermal energy resources are mined. The method can realize comprehensive, coordinated and green mining of hydrothermal geothermal energy and coal resources in deep mines, has high economic benefit, shows unique technical advantages and economic advantages in deep mine mining, and has wide application prospect.
Drawings
FIG. 1 is a flow chart of the deep mine hydrothermal type geothermal energy circulation and coal seam collaborative mining process of the invention.
FIG. 2 is a layout diagram of a deep mine hydrothermal type geothermal energy circulation and coal bed collaborative mining system of the invention
In the figure: 1. 1# coal face; 2. an N # coal face; 3. a heat treatment station; 4. performing gob-side entry retaining; 5. a coal mining hydraulic support; 6. a coal pillar; 7. a hydrothermal aqueous layer; 8. 1# working face return airway; 9. n # coal face haulage roadway; 10. an N # coal face return airway; 11. a heat energy extraction pipeline; 12. and (5) recharging cold water into the pipeline.
Detailed Description
The invention provides a deep mine hydrothermal geothermal energy circulation and coal bed collaborative mining system, which mainly comprises two aspects of coal face system arrangement, aquifer geothermal energy extraction and storage system arrangement:
firstly, optimizing and arranging an underground comprehensive mechanical coal face according to mining geological conditions of a deep mine;
and secondly, designing the size of the coal face according to the hydrogeological occurrence characteristics, overlying rock fracture development, rock stratum movement characteristics and the like of the coal seam adjacent to the water-bearing/water-resisting layer on the working face, selecting a reasonable coal mining method, and optimally arranging the underground comprehensive mechanical coal face including strip mining, thickness-limited mining, underground sorting, in-situ filling mining and the like so as to ensure the safe recovery of the working face.
Thirdly, performing gob-side entry retaining during the stoping period of the working face, performing process drilling for extracting and storing heat energy to an adjacent aquifer in the gob-side entry retaining, and installing corresponding transportation pipelines to complete the whole production system;
as a preferred embodiment, the width of a single working face and the distance between an extraction drill hole and a recharge drill hole in the heat-coal collaborative mining satisfy the following formula:
(N-1)×d≥L
and N is the mining quantity of the coal seam working face, d is the width of the coal seam working face, and L is the distance between the extraction and recharge drill holes.
And fourthly, monitoring the heat-coal collaborative mining effect in real time, and adjusting and feeding back the aquifer heat energy mining and working face coal mining design parameters to realize the collaborative safe mining of the deep mine hydrothermal geothermal energy and the coal bed.
Another objective of the present invention is to provide a specific process for hydrothermal geothermal energy extraction and storage in a deep mine hydrothermal geothermal energy circulation and coal seam collaborative mining system, which comprises:
(a) the extraction process comprises the following steps: the extraction pipeline is laid in the N # working face gob-side roadway 4, hydrothermal geothermal energy is lifted to the thermal energy treatment station 3 from the aquifer 7 through the heat energy extraction pipeline 11 sequentially through the gob-side roadway 4, the rail ascending mountain, the rail large roadway, the parking lot and the auxiliary well conveying pipeline, and the hydrothermal geothermal energy is changed into cold water through recycling to wait for next system circulation.
(b) The storage process comprises the following steps: cold water discharged from the heat energy treatment station 3 sequentially passes through an auxiliary well, a parking lot, a large track roadway and a track ascending mountain, is injected into the aquifer 7 through a cold water recharging pipeline 12 laid on the No. 1 working face along the empty roadway 4, and is extracted and utilized next time after the heat conduction action of the high-temperature rock mass.
Meanwhile, the system is monitored in real time for the heat-coal collaborative mining effect, and the high-yield high-efficiency and safe mining of the coal bed, and the high-efficiency extraction and cyclic utilization of heat energy are mainly included.
Specific embodiments of the invention are further described below with reference to the accompanying drawings:
examples
The mining depth of a main mining coal seam at a certain current stage reaches-1300 m, the designed production capacity of a mine is 150 kilo tons/a, medium-strength Ordovician limestone water exists at 50-200 m of the lower part of the coal seam, the thickness of the coal seam is 3m, and the volume weight of the coal seam is 1.4 tons/m3。
The invention relates to a deep mine hydrothermal geothermal energy circulation and coal bed collaborative mining system, which comprises the following specific steps:
firstly, designing the length of a coal face to be 150m according to the mining geological conditions of a deep mine and the production capacity of the mine, wherein the pushing length of the coal face is 2100m, and the coal face is produced for 330 days in one year in a 'four-six' system;
secondly, according to hydrogeology occurrence characteristics, overlying strata fracture development and rock stratum movement characteristics, aquifer heat energy conduction rules, extraction efficiency, recovery period and the like of a coal seam adjacent to a working face, comprehensive mechanized solid filling coal mining is adopted, underground coal and gangue sorting and tunneling gangue are selected as filling materials, and the filling rate is designed to be 80%; the geothermal energy extraction and storage drill holes are arranged in parallel in a gob-side entry retaining of the coal face, the gob-side entry is drilled to the adjacent aquifer, the number ratio is 1:1, the hole diameter of the drill holes is designed to be 250mm, the distance is designed to be 400m, and the distance between the heat energy extraction and cold water recharge drill holes is larger than 450 m.
Thirdly, during the stoping period of the working face, carrying out a process drilling (11) for extracting heat energy from the No. 4 working face gob-side entry retaining (4) to the adjacent aquifer, carrying out a process drilling (12) for recharging cold water from the No. 1 working face gob-side entry retaining (4) to the adjacent aquifer, and installing corresponding transportation pipelines to complete the whole production system;
and fourthly, monitoring the heat-coal collaborative mining effect in real time, and adjusting and feeding back the aquifer heat energy mining and working face coal mining design parameters to realize the collaborative safe mining of the deep mine hydrothermal geothermal energy and the coal bed.
The specific process of hydrothermal geothermal energy extraction and cold water recharging is as follows:
(a) the extraction process comprises the following steps: the extraction pipeline is laid in a 4# working face gob-side roadway (4), hydrothermal geothermal energy passes through the extraction conveying pipeline from the aquifer (7), sequentially passes through the gob-side roadway (4), the rail ascending mountain, the rail large roadway, the parking lot and the auxiliary well conveying pipeline, is lifted to the thermal energy treatment station (3), and is changed into cold water through cyclic utilization to wait for next system circulation.
(b) And (3) recharging process: cold water discharged by the ground heat energy treatment station (3) sequentially passes through an auxiliary well, a parking lot, a large track roadway and a track ascending mountain through a water injection conveying pipeline, is injected into a water-bearing stratum (7) through a recharge pipeline (12) laid on a gob-side roadway (4) of a No. 1 working face, and is subjected to next cycle mining after heat conduction of a high-temperature rock mass.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (2)
1. The utility model provides a deep mine hydrothermal type geothermal energy circulation and coal seam mining system in coordination which characterized in that: the geothermal energy circulating mining system is additionally arranged on the coal seam mining system to form a heat-coal collaborative mining system, and the method specifically comprises the following steps: performing gob-side entry retaining during working face extraction, performing heat energy extraction and cold water recharge storage process drilling holes including extraction drilling holes and recharge drilling holes to adjacent aquifers in the gob-side entry retaining, arranging transportation pipelines in the drilling holes, and correspondingly laying the transportation pipelines on the extraction drilling holes and the recharge drilling holesNHeat energy extraction pipeline (11) in # working face gob side entry, lay cold water recharge pipeline (12) in # working face gob side entry, heat energy extraction pipeline (11), cold water recharge pipeline (12) all are connected to heat energy processing station (3) on ground, form geothermal energy circulation exploitation system, heat energy extraction pipeline (11), cold water recharge pipeline (12) in # working face gob side entry, form geothermal energy circulation exploitation system, the heat energy extraction pipeline is connected to heat energy processing station (3) on ground, heat energy extraction pipeline (11) is connected to heat energy processing station (12) on ground, heat energy extraction pipeline (12) is connected to heat energy processing station (12) on ground, heat energy extraction pipeline (11) is connected to heat energy processing station (3) on ground, heat energy extraction pipeline (12) is connected to heat energy processing station (12) on ground, heat energy circulation exploitation system is connected to heat energy extraction pipeline (12) on ground, heat energy extraction pipeline (11) is connected to heat energy extraction pipeline (12) on ground, cold water extraction pipeline (12) on ground, heat energy extraction pipeline (12) is connected to heat energy extraction pipeline (11) on ground, heat energy extraction pipeline (12) is connected to heat energy extraction pipeline (3) on ground heat energy extraction pipeline, heat energy extraction pipeline (12) on ground heat energy extraction pipeline (3) on ground) is connected to heat energy extraction pipelineNThe coal seam working face mining quantity; and monitoring the heat-coal collaborative mining effect in real time, adjusting and feeding back the aquifer heat energy mining and working face coal mining design parameters, and realizing the collaborative safe mining of the deep mine hydrothermal geothermal energy and the coal bed.
2. The deep mine hydrothermal type geothermal energy circulation and coal bed collaborative mining system according to claim 1, wherein a specific process of hydrothermal type geothermal energy extraction and storage is as follows:
(a) the extraction process comprises the following steps: the heat energy extraction pipeline is laid onNIn a # working face gob-side roadway (4), hydrothermal geothermal energy is lifted to a thermal energy treatment station (3) from a water-bearing layer (7) through a thermal energy extraction pipeline (11) sequentially through the gob-side roadway (4), a rail ascending mountain, a rail large roadway, a parking lot and an auxiliary well conveying pipeline, and is changed into cold water through cyclic utilization to wait for next system circulation;
(b) the storage process comprises the following steps: cold water discharged by the heat energy treatment station (3) sequentially passes through an auxiliary well, a parking lot, a track main roadway and a track mountain, is injected into a water-bearing stratum (7) through a cold water recharging pipeline (12) laid on a No. 1 working face gob-side roadway (4), and is extracted and utilized next time after the heat conduction action of a high-temperature rock mass.
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| US4200152A (en) * | 1979-01-12 | 1980-04-29 | Foster John W | Method for enhancing simultaneous fracturing in the creation of a geothermal reservoir |
| CN2606868Y (en) * | 2003-01-09 | 2004-03-17 | 何满潮 | Producing and recharging system for geothermal hot water |
| CN109057796A (en) * | 2018-09-12 | 2018-12-21 | 中国矿业大学 | A kind of coal-heat based on High-geotemperature mine is total to mining method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4200152A (en) * | 1979-01-12 | 1980-04-29 | Foster John W | Method for enhancing simultaneous fracturing in the creation of a geothermal reservoir |
| CN2606868Y (en) * | 2003-01-09 | 2004-03-17 | 何满潮 | Producing and recharging system for geothermal hot water |
| CN109057796A (en) * | 2018-09-12 | 2018-12-21 | 中国矿业大学 | A kind of coal-heat based on High-geotemperature mine is total to mining method |
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