CN117514351A - Method for arranging hydrogen storage by using waste mine coal pillar - Google Patents
Method for arranging hydrogen storage by using waste mine coal pillar Download PDFInfo
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- CN117514351A CN117514351A CN202311625795.0A CN202311625795A CN117514351A CN 117514351 A CN117514351 A CN 117514351A CN 202311625795 A CN202311625795 A CN 202311625795A CN 117514351 A CN117514351 A CN 117514351A
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- 239000003245 coal Substances 0.000 title claims abstract description 127
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 125
- 239000001257 hydrogen Substances 0.000 title claims abstract description 125
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002699 waste material Substances 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 238000000605 extraction Methods 0.000 claims abstract description 26
- 239000011449 brick Substances 0.000 claims abstract description 18
- 238000010276 construction Methods 0.000 claims abstract description 11
- 239000011435 rock Substances 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000001179 sorption measurement Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 13
- 239000003566 sealing material Substances 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 4
- 229920006395 saturated elastomer Polymers 0.000 abstract description 4
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 150000002431 hydrogen Chemical class 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000010878 waste rock Substances 0.000 description 2
- 235000019994 cava Nutrition 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a method for arranging a hydrogen reservoir by utilizing waste mine coal pillars, belonging to the technical field of geological hydrogen storage; firstly, selecting a target coal pillar used for storing hydrogen in a waste mine with a low-permeability compact coal seam top and bottom plate, wherein the periphery of the target coal pillar is provided with a roadway; then sequentially building a water-saturated gangue filling area and a concrete block brick filling area in a target coal pillar four-neighbor roadway, wherein the water-saturated gangue filling area and the concrete block brick filling area are respectively used for realizing reservoir sealing and guaranteeing long-term stability of surrounding rock in a reservoir operation process; finally flexibly arranging hydrogen injection drilling holes/well drilling and extraction drilling holes/well drilling from the ground or underground according to the construction conditions of the hydrogen transmission pipeline; finally, hydrogen injection and extraction are carried out in the hydrogen storage area, so that the hydrogen is stored in a large scale in two forms of adsorption and free states in a coal seam pore fracture network; the invention solves the problem of high difficulty in excavation construction of underground hydrogen storage space and monitoring and maintaining stability of surrounding rock.
Description
Technical Field
The invention belongs to the technical field of geological hydrogen storage, and relates to a method for arranging a hydrogen storage by utilizing waste mine coal pillars.
Background
Because of the technical disadvantages of limited hydrogen storage capacity, high safety risk, low energy efficiency and high hydrogen storage cost of the surface tank hydrogen storage mode, the underground hydrogen storage technology is regarded as a potential ideal hydrogen storage path in the future. The existing similar underground hydrogen storage technology mainly utilizes underground construction spaces such as coal mine abandoned roadway (CN 116201599A) or hydrogen storage caves (CN 219139138U) to store hydrogen, the hydrogen storage modes have high cost in underground structure space excavation construction and surrounding rock stability monitoring maintenance, and the defects of large difficulty in lining long-term pressure-resistant sealing technology exist, so that large-scale long-term hydrogen storage application is difficult to realize.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a method for arranging a hydrogen reservoir by utilizing waste mine coal pillars, which solves the problems of the existing underground hydrogen storage space excavation construction, high surrounding rock stability and high sealing monitoring maintenance difficulty.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
A method for disposing a hydrogen storage by utilizing waste mine coal pillars, comprising the following steps:
s1, selecting a target coal pillar for storing hydrogen in a waste mine with a low-permeability compact coal seam top and bottom plate, wherein the periphery of the target coal pillar is provided with a roadway;
s2, building a sealed outer wall at the position 8-12cm away from the four sides of the target coal pillar, and filling the space between the sealed outer wall and the sides by using gangue particles with the particle size less than or equal to 5mm to form a gangue filling area;
s3, tightly filling and sealing roadway space between the outer wall and the four adjacent coal pillars by using pressure-resistant concrete block bricks to form a concrete block brick filling area; then arranging drilling holes from the concrete block brick filling area to the gangue filling area and sealing the holes, wherein the drilling holes are water injection holes;
s4, arranging a hydrogen injection well and a hydrogen extraction well from the ground to a target coal pillar or arranging a hydrogen injection drilling hole and a hydrogen extraction hole from the underground to the target coal pillar according to the construction condition of the hydrogen conveying pipeline, and sealing holes; then water is injected into the gangue filling area from the water injection hole to reach a water saturation state;
s5, injecting hydrogen from the hydrogen injection drilling hole, enabling the hydrogen to be stored in the target coal pillar in an adsorption state and a free state, simultaneously extracting the hydrogen from the hydrogen extraction hole, monitoring the concentration of the extracted hydrogen until the concentration and the pressure of the hydrogen reach target values, and finishing the arrangement of the coalbed hydrogen storage.
Preferably, the front side and the rear side of the target coal pillar are respectively provided with a first main lane and a second main lane which are parallel; the left side and the right side of the target coal seam are respectively provided with a second connecting lane and a third connecting lane which are parallel, one side of the second connecting lane far away from the target coal pillar is provided with a first coal pillar, and one side of the first coal pillar far away from the second connecting lane is provided with a first connecting lane.
Preferably, the implementation method for arranging the hydrogen injection hole from the underground to the target coal pillar comprises the following steps: and (3) drilling holes perpendicular to the first connecting roadway are arranged from the 1/2 position of the first connecting roadway to the first coal pillar, the bottoms of the holes reach the 10m positions of the boundaries of the first connecting roadway and the target coal pillar, and the drilling holes are sealed from the positions of the drilling holes to the 10m positions in the target coal pillar by using impervious cement sealing materials and steel sealing pipes.
More preferably, the implementation method for arranging the hydrogen extraction holes from underground comprises the following steps: 2 drilling holes perpendicular to the first connecting lane are respectively arranged from the 1/4 position and the 3/4 position of the first connecting lane to the first coal pillar, the bottoms of the drilling holes reach the 10m position of the boundary between the third connecting lane and the target coal pillar, and the drilling holes are sealed from the anti-seepage cement sealing material and the steel sealing pipe to the 10m position in the target coal pillar.
Preferably, the implementation method for arranging the hydrogen injection well from the ground comprises the following steps: and arranging a first L-shaped horizontal well from the position which faces the middle part of the target coal pillar and is parallel to the first main lane and the second main lane at equal intervals, wherein the hole bottoms and the hole openings of the horizontal well sections of the first L-shaped horizontal well are respectively 10m away from the boundaries of two sides of the target coal pillar, and sealing the vertical section of the L-shaped drilling well by using impervious cement sealing materials and steel sealing pipes.
More preferably, the implementation method for arranging the hydrogen extraction well from the ground comprises the following steps: and arranging 1 second L-shaped horizontal wells parallel to the first roadway from the positions which face the middle part of the target coal pillar and are 10m away from the two side boundaries of the target coal pillar, wherein the bottoms and the orifices of the horizontal well sections of the second L-shaped horizontal wells are 10m away from the two side boundaries of the target coal pillar respectively, and sealing the vertical sections of the L-shaped drilling by using impervious cement sealing materials and steel sealing pipes.
Preferably, the coal seam roof and floor is a compact hypotonic rock stratum with permeability less than 0.1 mD.
Preferably, the sealed outer wall is built by adopting impervious concrete and pressure-resistant concrete block bricks.
More preferably, the compressive strength of the pressure-resistant concrete block brick is more than or equal to 10MPa, and the impermeability grade of the impermeable concrete is more than or equal to P12.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention skillfully utilizes the existing laneway and coal pillar of the abandoned mine, can realize the arrangement of the high-pressure hydrogen storage of the coal seam through lower construction cost, and improves the utilization value of the abandoned materials such as the residual coal pillar, the construction space, the gangue and the like of the abandoned mine.
2. The invention compactly fills the coal pillar four-neighbor roadway through the pressure-resistant concrete block bricks, can eliminate the influence of stress concentration and stress loosening of roadway surrounding rocks, and maintains the uniform distribution and long-term stability of the stress of the surrounding rocks of the reservoir, thereby ensuring the high-pressure and long-period operation of the hydrogen reservoir.
3. On one hand, the waste rock filling area filled with water can fill the waste rock particle gaps completely with water by injecting water, so that the complete sealing of coal pillar hydrogen is realized, and on the other hand, the stress of the coal side outer wall is stable by adjusting the water saturation pressure, so that deformation, cracking and airtight damage of the concrete block brick filling area caused by cyclic load in the process of repeatedly injecting and extracting high-pressure hydrogen are avoided.
4. In addition, the invention can flexibly select a plurality of hydrogen injection and extraction drilling (well) combined arrangement modes such as underground hydrogen injection and extraction, underground hydrogen injection ground hydrogen extraction, underground hydrogen extraction ground hydrogen injection, ground hydrogen injection and extraction and the like according to the actual hydrogen storage and use hydrogen demand and facility conditions, and has better convenience in hydrogen storage and use hydrogen pipeline arrangement.
Drawings
FIG. 1 is a plan view of a hydrogen reservoir build target area;
FIG. 2 is a side view of section A-A' of FIG. 1;
FIG. 3 is a plan view of the arrangement of filling construction and water injection drilling of a coal pillar four-neighbor roadway;
FIG. 4 is a side view of section B-B' of FIG. 3;
FIG. 5 is a plan view of downhole hydrogen injection and downhole extraction borehole construction;
FIG. 6 is a side view of section C-C' of FIG. 5;
FIG. 7 is a plan view of a waste fill zone water-filled seal and hydrogen injection-extraction;
FIG. 8 is a side view of section D-D' of FIG. 7;
FIG. 9 is a plan view of a surface hydrogen injection and downhole extraction hydrogen reservoir arrangement;
FIG. 10 is a side view of section E-E' of FIG. 9;
FIG. 11 is a plan view of a downhole hydrogen injection and surface extraction hydrogen reservoir arrangement;
FIG. 12 is a side view of section F-F' of FIG. 11;
FIG. 13 is a plan view of a surface hydrogen injection and surface extraction hydrogen reservoir arrangement;
FIG. 14 is a side view of section G-G' of FIG. 13;
in the figure: 1-transportation main lane, 2-return main lane, 3-first connecting lane, 4-second connecting lane, 5-third connecting lane, 6-first coal pillar, 7-second coal pillar, 8-gangue filling area, 9-concrete block brick filling area, 10-water injection hole, 11-hydrogen injection hole, 12-hydrogen extraction hole, 13-saturated water gangue filling area, 14-hydrogen storage coal pillar, 15-coal seam roof, 16-coal seam bottom plate, 17-coal seam overlying strata, 18-first L-shaped horizontal well and 19-second L-shaped horizontal well.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Example 1
The embodiment provides a method for arranging a hydrogen storage by utilizing waste mine coal pillars; the method comprises the following specific steps:
1) As shown in fig. 1 and 2, through data checking and on-site investigation, the average thickness of the waste mine coal seam is 4m, the coal seam roof 15 and the coal seam floor 16 are compact low-permeability mud rock layers with permeability lower than 0.1mD, the mine track transportation main roadway 1 and the return air main roadway 2 are coal roadways, the residual coal pillar width between the two roadways is 40m, and 3 parallel connecting roadways are arranged. The distance between the first connecting lane 3 and the second connecting lane 4 is 60m, and the coal pillar is a first coal pillar 6; the distance between the second connecting lane 4 and the third connecting lane 5 is 100m, and the coal pillar is a second coal pillar 7. The second coal pillar 7 in the abandoned mine is selected as the coal pillar for hydrogen storage.
2) As shown in fig. 3 and 4, residual coal rubble and the like at the top and bottom of four adjacent roadways (namely, a conveying main roadway 1, a return main roadway 2, a second connecting roadway 4 and a third connecting roadway 5) of the second coal pillar 7 are cleaned, so that the low-permeability dense top and bottom plates are completely exposed, then, at a position 10cm away from the four sides of the second coal pillar 7, a sealed outer wall is built by concrete with an impervious grade of P12 and pressure-resistant concrete block bricks, and meanwhile, the space between the outer wall and the coal sides of the second coal pillar 7 is filled with gangue particles with the particle size of not more than 5mm, so that a gangue filling area 8 is formed.
3) And (3) tightly filling roadway spaces between the outer wall of the second coal pillar 7 and the four adjacent coal pillars by using the pressure-resistant concrete block bricks with the uniaxial compressive strength of 12MPa to form a concrete block brick filling area 9. And then drilling holes are arranged from the transportation roadway 1 to the concrete block filling area 9 to the gangue filling area 8, and the drilling holes are water injection holes 10 by using impervious cement hole sealing materials and phi 40mm steel hole sealing pipes.
4) As shown in fig. 5 and 6, the hydrogen injection hole 11 is arranged from the downhole, and the embodiment is as follows: and drilling holes perpendicular to the first connecting roadway 3 are arranged from the position of 20m of the first connecting roadway 3 to the first coal pillar 6, the bottoms of the holes reach the position of 10m of the boundary between the third connecting roadway 5 and the second coal pillar 7, and the positions of the drilling holes and the position of 10m of the second coal pillar 7 are sealed by using impervious cement sealing materials and phi 60mm steel sealing pipes.
5) The hydrogen extraction holes 12 are arranged downhole, in the embodiment: 2 drilling holes perpendicular to the first connecting roadway 3 are respectively arranged from the positions of 10m and 30m of the first connecting roadway 3 to the first coal pillar 6, the bottoms of the drilling holes reach the position of 10m of the boundary between the third connecting roadway 5 and the second coal pillar 7, and the drilling holes are sealed from the position of 10m of the second coal pillar 7 to the position of 10m of the second coal pillar 7 by using impervious cement sealing materials and phi 60 steel sealing pipes.
6) Referring to fig. 7 and 8, water is injected from the water injection hole 10 to the waste filling area 8 to a water saturation state and the water pressure of the water injection hole is kept stable, so that a water-saturated waste filling area 13 is formed. At this time, the second coal pillar 7 is reformed into a hydrogen storage coal pillar 14. And injecting hydrogen from the hydrogen injection hole 11, so that the hydrogen is stored in the hydrogen storage coal pillar 14 in an adsorption state and a free state, simultaneously extracting the hydrogen from the hydrogen extraction hole 12, and monitoring the concentration of the extracted hydrogen until the concentration and the pressure of the hydrogen reach the utilization target values, and completing the arrangement of the coalbed hydrogen storage.
The volume of coal in the hydrogen reservoir is 4m×40m×100deg.m=16000 m 3 According to published literature, the density of coal is 1.4g/cm 3 The molar mass of hydrogen is 2g/mol, the hydrogen storage amount of unit mass coal body under the condition of the hydrogen storage pressure of 7MPa is 0.2-1mmol/g, and the hydrogen storage amount of the reservoir can reach 8.96-44.8t. With a heating value of 1.4X10 for hydrogen 8 J/kg, the energy storage scale of the hydrogen storage can reach 0.348-1.742GWh.
Example 2
As shown in fig. 9 and 10, the method of the invention is used for arranging a hydrogen storage by utilizing a coal pillar in a abandoned mine. The specific steps 1), 2), 3), 5) and 6) are the same as those of the embodiment 1, and the step 4) is replaced by the following steps:
4) The hydrogen filling hole is arranged from the ground, and the implementation scheme is as follows: and a first L-shaped horizontal well 18 with 1 opening is arranged from the ground, namely the coal seam overlying rock 17 in fig. 10, to the middle part of the second coal pillar 7 and parallel to the conveying main roadway 1 and the return air main roadway 2 at an equidistant position, the hole bottoms and the hole openings of the horizontal well sections of the first L-shaped horizontal well 18 are respectively 10m away from the boundaries of two sides of the second coal pillar 7, and the vertical sections of the first L-shaped horizontal well 18 are sealed by using impervious cement sealing materials and phi 60 steel sealing pipes. The first L-shaped horizontal well 18 corresponds to the hydrogen injection hole 11 in embodiment 1.
Example 3
As shown in fig. 11 and 12, the method of the invention is used to arrange a hydrogen reservoir by using a coal pillar in a abandoned mine. The specific steps 1), 2), 3), 4), and 6) are the same as those of the embodiment 1, and the step 5) is replaced by the following steps:
5) And 1 second L-shaped horizontal wells 19 parallel to the conveying roadway 1 are respectively arranged at positions which are 10m away from the two side boundaries of the second coal pillar 7 and face the middle part of the second coal pillar 7, the bottoms and the orifices of the horizontal well sections of the second L-shaped horizontal wells 19 are respectively 10m away from the two side boundaries of the second coal pillar 7, and the vertical sections of the second L-shaped horizontal wells 19 are sealed by using impervious cement sealing materials and phi 60 steel sealing pipes. The function of the second L-shaped horizontal well 19 is the same as that of the hydrogen extraction hole 12 in embodiment 1.
Example 4
As shown in fig. 13 and 14, the method of the invention is used to arrange a hydrogen reservoir by using a coal pillar in a abandoned mine. The specific steps 1), 2), 3), and 6) are the same as those in example 1, the step 4) is the same as example 2, and the step 5) is the same as example 3.
While the invention has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the invention pertains without departing from the scope of the invention defined by the appended claims.
Claims (9)
1. A method for arranging a hydrogen storage by utilizing waste mine coal pillars, which is characterized by comprising the following steps:
s1, selecting a target coal pillar for storing hydrogen in a waste mine with a low-permeability compact coal seam top and bottom plate, wherein the periphery of the target coal pillar is provided with a roadway;
s2, building a sealing outer wall at the position 8-12cm away from the four sides of the target coal pillar, and filling the space between the sealing outer wall and the sides by using gangue particles with the particle size less than or equal to 5mm to form a gangue filling area (8);
s3, tightly filling and sealing roadway space between the outer wall and the four adjacent coal pillars by using pressure-resistant concrete block bricks to form a concrete block brick filling area (9); then arranging drilling holes from the concrete block brick filling area (9) to the gangue filling area (8) and sealing the drilling holes, wherein the drilling holes are water injection holes (10);
s4, arranging a hydrogen injection well and a hydrogen extraction well from the ground to a target coal pillar or arranging a hydrogen injection drilling hole and a hydrogen extraction hole from the underground to the target coal pillar according to the construction condition of the hydrogen conveying pipeline, and sealing holes; then water is injected into the gangue filling area (8) from the water injection hole (10) to a water saturation state;
s5, injecting hydrogen from the hydrogen injection drilling hole, enabling the hydrogen to be stored in the target coal pillar in an adsorption state and a free state, simultaneously extracting the hydrogen from the hydrogen extraction hole, monitoring the concentration of the extracted hydrogen until the concentration and the pressure of the hydrogen reach target values, and finishing the arrangement of the coalbed hydrogen storage.
2. The method for arranging a hydrogen storage by utilizing waste mine coal pillars according to claim 1, wherein the front side and the rear side of the target coal pillar are respectively provided with a first main lane and a second main lane which are parallel; the left side and the right side of the target coal seam are respectively provided with a second connecting roadway (4) and a third connecting roadway (5) which are parallel, one side, far away from the target coal pillar, of the second connecting roadway (4) is provided with a first coal pillar (6), and one side, far away from the second connecting roadway (4), of the first coal pillar (6) is provided with a first connecting roadway (3).
3. The method for arranging a hydrogen storage by using waste mine coal pillars according to claim 2, wherein the method for arranging the hydrogen injection holes from underground to the target coal pillars is implemented by the following steps: and (3) drilling holes perpendicular to the first connecting roadway (3) are arranged from the 1/2 position of the first connecting roadway (3) to the first coal pillar (6), the bottoms of the holes reach the position of 10m of the boundary between the first connecting roadway (3) and the target coal pillar, and the positions of the drilling holes reach the position of 10m in the target coal pillar by using impervious cement hole sealing materials and steel hole sealing pipes.
4. A method for disposing a hydrogen storage using waste mine coal pillars according to claim 3, wherein the method for disposing the hydrogen extraction holes from the underground is as follows: 2 drilling holes perpendicular to the first connecting roadway (3) are respectively arranged from 1/4 and 3/4 positions of the first connecting roadway (3) to the first coal pillar (6), the bottoms of the drilling holes are 10m away from the boundary between the third connecting roadway (5) and the target coal pillar, and the drilling holes are sealed from the 10m away from the inside of the target coal pillar by using impervious cement sealing materials and steel sealing pipes.
5. The method for arranging a hydrogen storage by using waste mine coal pillars according to claim 2, wherein the method for arranging the hydrogen injection well from the ground is implemented by: and arranging a first L-shaped horizontal well from the position which faces the middle part of the target coal pillar and is parallel to the first main lane and the second main lane at equal intervals, wherein the hole bottoms and the hole openings of the horizontal well sections of the first L-shaped horizontal well are respectively 10m away from the boundaries of two sides of the target coal pillar, and sealing the vertical section of the L-shaped drilling well by using impervious cement sealing materials and steel sealing pipes.
6. The method for arranging a hydrogen storage by using waste mine coal pillars according to claim 5, wherein the implementation method for arranging the hydrogen extraction well from the ground is as follows: and arranging 1 second L-shaped horizontal wells parallel to the first roadway from the positions which face the middle part of the target coal pillar and are 10m away from the two side boundaries of the target coal pillar, wherein the bottoms and the orifices of the horizontal well sections of the second L-shaped horizontal wells are 10m away from the two side boundaries of the target coal pillar respectively, and sealing the vertical sections of the L-shaped drilling by using impervious cement sealing materials and steel sealing pipes.
7. The method for disposing a hydrogen storage tank by using waste mine coal pillars according to claim 1, wherein the top and bottom plates of the coal seam are dense hypotonic rock formations with permeability less than 0.1 mD.
8. The method for arranging a hydrogen storage tank by utilizing waste mine coal pillars according to claim 1, wherein the sealed outer wall is built by adopting impervious concrete and pressure-resistant concrete block bricks.
9. The method for arranging a hydrogen storage tank by utilizing waste mine coal pillars according to claim 8, wherein the compressive strength of the pressure-resistant concrete block brick is more than or equal to 10MPa, and the impermeability grade of the impermeable concrete is more than or equal to P12.
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| CN202311625795.0A CN117514351A (en) | 2023-11-30 | 2023-11-30 | Method for arranging hydrogen storage by using waste mine coal pillar |
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| CN202311625795.0A CN117514351A (en) | 2023-11-30 | 2023-11-30 | Method for arranging hydrogen storage by using waste mine coal pillar |
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