CN104763427B - A kind of supercritical CO2the thick hard difficulty in presplitting colliery collapses the method for top board - Google Patents
A kind of supercritical CO2the thick hard difficulty in presplitting colliery collapses the method for top board Download PDFInfo
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- CN104763427B CN104763427B CN201510082064.5A CN201510082064A CN104763427B CN 104763427 B CN104763427 B CN 104763427B CN 201510082064 A CN201510082064 A CN 201510082064A CN 104763427 B CN104763427 B CN 104763427B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 14
- 238000005553 drilling Methods 0.000 claims description 22
- 238000003860 storage Methods 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 6
- 230000008961 swelling Effects 0.000 claims description 6
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 2
- 239000002196 Pyroceram Substances 0.000 claims description 2
- 239000000378 calcium silicate Substances 0.000 claims description 2
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000011490 mineral wool Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 229920002635 polyurethane Polymers 0.000 claims 1
- 239000004814 polyurethane Substances 0.000 claims 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 239000011435 rock Substances 0.000 abstract description 9
- 230000000737 periodic effect Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000725 suspension Substances 0.000 abstract description 3
- 230000000977 initiatory effect Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a kind of supercritical CO2The thick hard difficulty in presplitting colliery collapses the method for top board, belongs to safety of coal mines production technique field.This invention makes full use of supercritical CO2High density, the characteristic such as low viscosity, high diffusibility and rock breaking capacity be strong, it is achieved to colliery, the thick hard difficulty difficulty that collapses collapses the Advance presplitting of top board.This invention is possible not only to reduce CO2Industrial discharge amount, realize CO2The cost recycling, reducing Advance presplitting, and can reduce thick hard difficulty collapse top board area of suspension roof, reduce its first/periodic weighting step pitch and ground pressure strength, thus the thick and hard roof instantaneous dynamic disaster being caving initiation when being prevented effectively from longwall top coal caving, guarantee safe production.
Description
Technical field
The invention belongs to technical field of coal exploitation, especially relate to a kind of supercritical CO2The thick hard difficulty in presplitting colliery collapses the method for top board.
Background technology
The colliery tight roof that thickness is big, intensity is high, compact structure, globality are good is extensively composed in the many mining areas of China and is deposited.When thickness and super high seam longwall top coal caving, stope thick and hard roof can not be caving in time.With the gradually propelling of working face, the collapse unsettled area of top board of the thick hard difficulty of stope can be gradually increased, and this will certainly strengthen the supporting difficulty of Stope face；Simultaneously, the collapse first/periodic weighting step pitch of top board of the thick hard difficulty of stope is very big, it can be with the substantial amounts of energy of gradually propelling accumulation of working face, when the load of the deadweight of stope thick and hard roof and overlying rock reaches its ultimate strength, moment roof completely failing will occur, and then cause violent dynamic impact problem disaster, destroy roadway surrounding rock and stope equipment, even cause casualties.
The collapse Advance presplitting of top board of the thick hard difficulty in colliery can effectively reduce the area of suspension roof in goaf, shorten first/periodic weighting step pitch, reduces first/periodic weighting intensity, and then guarantees safe production.Traditionally, the collapse pre-splitting method of top board of the thick hard difficulty in colliery specifically includes that water filling weakens method, chemical explosive blasting procedure, hydrofracturing method etc..Water filling weakens method and weakens thick and hard roof by raising moisture content, dissolving cementing mineral, reduction cohesion, its presplitting poor effect；The Blasting shock wave that chemical explosive blasting procedure produces is relatively big to the energetic disturbance of coal rock layer, its poor controllability, when have miso-fire, the phenomenon such as miss-fire to occur, the spark producing in operating process etc. easily causes gas explosion, and potential safety hazard is very big；Hydrofracturing method not only consumes substantial amounts of water resource, and during presplitting, the chemical reagent in high pressure fracture liquid easily causes pollution.Therefore, need badly and find the good thick hard difficulty in colliery of a kind of easy operation, low cost, the effect top board pre-splitting method that collapses and guarantee safe production.
Work as CO2Temperature and pressure when being above its critical-temperature (31.26 DEG C) and critical pressure (7.38MPa), referred to as supercritical CO2.Supercritical CO2There is the characteristics such as high density, low viscosity, high diffusibility.Its rock breaking capacity is strong, efficiency is high, is widely used in drilling well, completion and the volume increase of oil and gas development.But, supercritical CO2Presplitting technology technical field of coal exploitation (especially the thick hard difficulty in colliery collapse top board Advance presplitting in terms of) application rarely have report.
A kind of supercritical CO2The hard difficulty in presplitting colliery collapse the method for top board easily operate, low cost, effect good, be possible not only to avoid the shortcoming of preceding method and inferior position, and supercritical CO can be made full use of2High density, the characteristic such as low viscosity, high diffusibility and rock breaking capacity be strong, and then realize that to the colliery thick hard difficulty difficulty that collapses collapses the presplitting of top board.
Content of the invention
The technical problem to be solved is: provides one and makes full use of supercritical CO2High density, the method for the thick hard difficulty in characteristic presplitting colliery the collapses top board such as low viscosity, high diffusibility and rock breaking capacity be strong.
For solving above-mentioned technical problem, the present invention realizes according to techniques below scheme:
A kind of supercritical CO2The thick hard difficulty in presplitting colliery collapses the method for top board, specifically includes following steps:
(1) CO is purified2Gas, liquefaction under the effect of temperature controller is packaged in CO2In storage tank, and transport coal-face to；
(2) it is sequentially connected with supercritical CO in the following order2Presplitting system: CO2Storage tank jet high-pressure pump feed pipe filter jet pipe reel jet pipe fixator return duct scaper gas purifier, can the system of inspection properly functioning；
(3) in stope haulage gate and track crossheading, first advance drills through jet drilling respectively in thickness difficulty firmly collapses top board, and offers wedge shape annular groove in jet drilling end；
(4) jet pipe is stretched into the jet drilling depths that step (3) is arranged, and the jet drilling perforate end offered in step (3) disposes water filling height compression swelling hole packer；
(5) CO is regulated2The temperature and pressure of storage tank makes simultaneously above critical point, by liquid CO2It is changed into supercritical CO2；
(6) open supplying valve, closing volume valve, start high-pressure pump, make supercritical CO2Fluid enters in the wedge shape annular groove that step (3) is offered through feed pipe jet high-pressure pump filter jet pipe high-pressure jet nozzle successively, it is achieved the presplitting of the top board that collapses colliery thickness difficulty firmly；
(7) open return valve, close supplying valve, make supercritical CO2Backflow is successively through jet pipe return valve scaper clarifier, it is achieved removal of impurities and purification, and finally liquefaction is packaged in CO2To recycle in storage tank；
(8) it with the gradually propelling of working face, is repeated in above-mentioned steps (3), (4), (5), (6) and (7), it is achieved the Advance presplitting of the top board that collapses colliery thickness difficulty firmly.
Preferably, CO in described step (1)2Gas purifies from industrial tail gas.
Preferably, described step (1) temperature controller is held concurrently and is cooled down with heating function in one, and its measurement control range is-300 DEG C～150 DEG C, can not only cool down the CO of purification in industrial tail gas2Gas, and liquid CO can be regulated and controled in time2Temperature, make to reach supercriticality.
Preferably, CO in described step (1)2The pressure of storage tank is 8～12MPa.
Preferably, supercritical CO in described step (2)2The material of feed pipe and jet pipe is one or more having in rock wool, pyroceram cotton, alumina silicate, microporous calcium silicate, composition silicate or the poly-ammonia of insulating characteristics, to avoid supercritical CO2Temperature losses during Pipeline transport for the fluid.
Preferably, in described step (3) haulage gate and track crossheading, the distance of the advanced coal-face of position of jet drilling is 5-15m.
Preferably, the diameter d of described step (3) jet drilling0It is 40～120mm.
Preferably, pitch of holes l of described step (3) jet drilling0It is 5～10m.
Preferably, the angle α of the firmly difficult top board that collapses of described step (3) jet drilling and thickness is 15 °～75 °.
Preferably, described step (3) offers wedge shape annular groove in jet drilling end can make supercritical CO2The formation to thick and hard roof crack for the fluid produces guide effect with extension.
Preferably, the sealed borehole length of described step (4) water filling height compression swelling hole packer is 2～5m.
Preferably, described step (5) supercritical CO2Critical-temperature be 31.26 DEG C, critical pressure is 7.38MPa.
Preferably, supercritical CO in described step (6)2Fluid is delivered to filter through feed pipe under the effect of high-pressure pump and carries out removal of impurities, and then realizes secondary purification, it is to avoid the wear-out failure of jet pipe etc..
Preferably, described step (6) jet break rock after supercritical CO2The separation that landwaste realizes impurity through return duct, scaper and clarifier is taken in backflow, and is finally back to CO2Storage tank, it is achieved recycle.
Preferably, in step (8), the advance distance of working face isWherein L is thick and hard roof First Weighting Interval of Main L1With periodic weighting step pitch L2Smaller value.
Use technique scheme, the invention has the beneficial effects as follows:
The present invention utilizes supercritical CO2Fluid, as jet liquid, gives full play to its low glutinous and easy diffusion property, it is achieved the Advance presplitting to colliery thick and hard roof.
(1) present invention is by the CO of industrial tail gas2As supercritical CO2The gas source of fluid, decreases CO2Industrial discharge amount, it is achieved that CO2Recycle, reduce thick hard difficulty and collapse the cost of top board Advance presplitting.
(2) present invention uses supercritical CO2Fluid presplitting colliery thick and hard roof, it is possible not only to reduce thick hard difficulty to collapse the area of suspension roof of top board, and its first/periodic weighting step pitch and ground pressure strength can be reduced, thus the thick and hard roof instantaneous dynamic disaster being caving initiation when being prevented effectively from longwall top coal caving, guarantee safe production.
Brief description
Fig. 1 is supercritical CO2The thick hard difficulty in presplitting colliery collapses the schematic diagram of top board；
Fig. 2 is supercritical CO2The thick hard difficulty in presplitting colliery collapses ceiling jets drilling plane distribution schematic diagram；
Fig. 3 is supercritical CO2The thick hard difficulty in presplitting colliery collapses ceiling jets boring tangent plane distribution schematic diagram；
In figure: 1 gaseous state CO2；2 temperature controllers；3—CO2Storage tank；4 jet high-pressure pumps；5 feed pipes；6 filters；7 jet pipe reels；8 jet pipes；9 fixators；10 return ducts；11 scapers；12 gas purifiers；13 haulage gates；14 track crossheadings；15 thick hard difficulties collapse top board；16 jet drillings；17 wedge shape annular grooves；18 water filling height compression swelling hole packers；19 jet pipe nozzles；20 working faces；21 stope coal bodies；K1Supplying valve；K2Return valve；l0With the group spacing of wells；The advance distance of d working face.
Detailed description of the invention
Following example are intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.
In order to clearer understanding is had to the technical goal of the present invention, feature and effect, in conjunction with accompanying drawing to supercritical CO2Presplitting Lu An group ore deposit thickness is that the good fine sandstone top board of 10.1m, Polodyakonov coefficient f=8～9, fine and close distribution, globality is described in further detail.
No. 3 ocurrences of coal seam of Lu An group ore deposit are stable, and average thickness is 5.6m, and inclination angle is 3.5 °, and buried depth is 506.15m, and strike length is 1536m, is inclined to a length of 240m.At present, No. 3 coal seams use and move towards longwell retrusive longwall top coal caving.The argillaceous sandstone for grey black is directly pushed up in No. 3 coal seams, and thickness is 2.56m, Polodyakonov coefficient f=3～4, and vertical crack is more grown；Base object model is Dark grey fine sandstone, and thickness is 10.1m, Polodyakonov coefficient f=8～9, and fine and close distribution, globality is good.During No. 3 seam minings, lithology is that the unsettled area of the thick and hard roof of fine sandstone is bigger, it is impossible to is caving in time, causes the supporting difficulty of Stope face to strengthen；Meanwhile, the collapse first/periodic weighting step pitch of top board of thick hard fine sandstone difficulty is very big, and it can be with the substantial amounts of energy of gradually propelling accumulation of working face, and there is moment roof completely failing, and then cause violent dynamic impact problem disaster, destroy roadway surrounding rock and stope equipment, threaten safety in production.Now use supercritical CO2Presplitting carrys out the fine sandstone roof stratas that the thick hard difficulty in No. 3 coal seams of presplitting Lu An group ore deposit collapses, and it specifically includes following steps:
Step one, purifies gaseous state CO from industrial tail gas21, liquefaction under the effect of the temperature controller 2 (having both cooling and heating function) that measurement control range is-300 DEG C～150 DEG C is packaged in the pressure CO for 12MPa2In storage tank 3, by aforementioned CO2Storage tank 3 transports coal-face 20 to.
Step 2, is sequentially connected with supercritical CO in the following order2Presplitting system: CO2Storage tank 3 jet high-pressure pump 4 feed pipe 5 filter 6 jet pipe reel 7 jet pipe 8 fixator 9 return duct 10 scaper 11 gas purifier 12, can the system of inspection properly functioning.
Step 3, in stope haulage gate 13 and track crossheading 14, first advance 10m drills through diameter d respectively in thickness difficulty firmly collapses top board 150For 80mm, pitch of holes l0The about angle α of 8m and thick and hard roof is respectively the jet drilling 16 of 15 °, 30 °, 45 °, 60 ° and 75 °, and is offering wedge shape annular groove 17 at the bottom of jet drilling 16 hole so that it is formation and extension to crack in thick and hard roof produce guide effect.
Jet pipe 8 is stretched into the jet drilling depths that step (3) is arranged by step 4, and the jet drilling perforate end offered in step (3) disposes water filling height compression swelling hole packer 18, it is ensured that its sealed borehole length is 4m；
Step 5, regulates CO respectively2The temperature and pressure of storage tank makes simultaneously above critical-temperature (31.26 DEG C) and critical pressure (7.38MPa), by liquid CO2It is changed into supercritical CO2；
Step 6, opens supplying valve K1, closing volume valve K2, start jet high-pressure pump 4, make CO2Liquid CO in storage tank 32Enter in the wedge shape annular groove 17 that step (3) is offered through jet high-pressure pump 4 feed pipe 5 filter 6 jet pipe reel 7 jet pipe 8 high-pressure spray pipe nozzle 19 successively, it is achieved the presplitting of top board 15 that thickness difficulty firmly in colliery is collapsed.
Step 7, opens return valve K2, close supplying valve K1, make supercritical CO2Backflow is successively through jet pipe 8 return valve K2Scaper 11 gas purifier 12, it is achieved removal of impurities and purification, and finally liquefaction is packaged in CO2In storage tank 3, it is achieved recycle.
Step 8, when working face 20 often advances(wherein, L is thick and hard roof First Weighting Interval of Main L1With periodic weighting step pitch L2Smaller value) when, be repeated in above-mentioned steps (3), (4), (5), (6) and (7), it is achieved thick hard difficulty collapses the Advance presplitting of top board to colliery.
The above be the preferred embodiment of the present invention, it is noted that on the premise of without departing from technical spirit of the present invention with principle, above-mentioned implementation is made any improve and polish, belong to the protection domain of technical solution of the present invention.
Claims (10)
1. a supercritical CO2The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that comprise the following steps:
(1) CO is purified2Gas, liquefaction under the effect of temperature controller is packaged in CO2In storage tank, and transport coal-face to；
(2) it is sequentially connected with supercritical CO in the following order2Presplitting system: CO2Storage tank jet high-pressure pump feed pipe
Filter jet pipe reel jet pipe fixator return duct scaper gas purifier,
Can inspection system properly functioning；
(3) in stope haulage gate and track crossheading, first advance drills through jet drilling respectively in thickness difficulty firmly collapses top board, and
Offer wedge shape annular groove in jet drilling end；
(4) jet pipe is stretched into the jet drilling depths that step (3) is arranged, and the jet drilling perforate offered in step (3)
End disposes water filling height compression swelling hole packer；
(5) CO is regulated2The temperature and pressure of storage tank makes simultaneously above critical point, by liquid CO2It is changed into supercritical CO2；
(6) open supplying valve, closing volume valve, start high-pressure pump, make supercritical CO2Fluid is successively through feed pipe jet
High-pressure pump filter jet pipe high-pressure jet nozzle enters in the wedge shape annular groove that step (3) is offered, it is achieved to coal
The thick hard difficulty of ore deposit collapses the presplitting of top board；
(7) open return valve, close supplying valve, make supercritical CO2Backflow is successively through jet pipe return valve scaper
Clarifier, it is achieved removal of impurities and purification, and finally liquefaction is packaged in CO2To recycle in storage tank；
(8) it with the gradually propelling of working face, is repeated in above-mentioned steps (3), (4), (5), (6) and (7), it is achieved right
The thick hard difficulty in colliery collapses the Advance presplitting of top board.
2. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that described
CO in step (1)2Gas purifies from industrial tail gas, and then under the effect of temperature controller, liquefaction is packaged in and pressure is
The CO of 8-12MPa2In storage tank.
3. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that described
Step (1) temperature controller is held concurrently and is cooled down with heating function in one, and its measurement control range is-300 DEG C～150 DEG C.
4. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that described
Supercritical CO in step (2)2The material of feed pipe and jet pipe is to have that the rock wool of insulating characteristics, pyroceram be cotton, silicic acid
One or more in aluminium, microporous calcium silicate, composition silicate or polyurethane.
5. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that described
In step (3) haulage gate and track crossheading, the position of jet drilling needs the distance of advanced coal-face is 5-15m.
6. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that described
Step (3) jet drilling diameter d0It is 40～120mm, pitch of holes l0It is that the angle α of the firmly difficult top board that collapses is 5～10m with thickness
15 °～75 °.
7. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that described
The sealed borehole length of step (4) water filling height compression swelling hole packer is 2-5m.
8. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that described
Step (5) supercritical CO2Critical-temperature be 31.26 DEG C, critical pressure is 7.38MPa.
9. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that described
Supercritical CO in step (6)2Fluid is delivered to filter through feed pipe under the effect of high-pressure pump and carries out removal of impurities, and then realizes two
Secondary purification, it is to avoid the wear-out failure of jet pipe.
10. supercritical CO according to claim 12The thick hard difficulty in presplitting colliery collapses the method for top board, it is characterised in that step
(8), in, the advance distance of working face isWherein L is thick and hard roof First Weighting Interval of Main L1And the cycle
Water component L2Smaller value.
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| CN106837330A (en) * | 2017-03-22 | 2017-06-13 | 辽宁工程技术大学 | A kind of supercritical CO2Improve the device of coal seam permeability |
| US11772976B2 (en) * | 2017-07-13 | 2023-10-03 | Carbon Upcycling Technologies Inc. | Mechanochemical process to produce exfoliated nanoparticles |
| CN108361011B (en) * | 2018-03-08 | 2020-06-23 | 河南理工大学 | Method for controlling mining influence range from underground roadway directional hydraulic fracturing |
| CN108999596B (en) * | 2018-07-27 | 2020-06-09 | 辽宁工程技术大学 | Method for gas explosion fracturing of coal rock mass by supercritical CO2 point-type jet flow |
| CN109372510B (en) * | 2018-11-26 | 2020-08-25 | 武汉工程大学 | Method for fracturing limestone top plate by using carbon dioxide and water mixed fluid |
| CN109488273B (en) * | 2018-11-26 | 2020-12-29 | 武汉工程大学 | Device for fracturing limestone top plate by using carbon dioxide and water mixed fluid |
| CN111042815B (en) * | 2019-12-27 | 2020-12-22 | 中南大学 | Method for releasing stress of triangular suspended ceiling area by blasting island body |
| CN115596388B (en) * | 2022-12-14 | 2023-03-24 | 太原理工大学 | Propelling equipment for underground coal rock stratum hydraulic fracturing hole packer and using method thereof |
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| CN104153750A (en) * | 2014-08-20 | 2014-11-19 | 北京中科诚毅科技发展有限公司 | Method for generating coal gas underground through air fracture and micro negative pressure |
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| CN1532374A (en) * | 2003-03-18 | 2004-09-29 | 淮南矿业(集团)有限责任公司 | Method for pumping out gas from mining coal layer roof |
| CN103742149A (en) * | 2014-01-22 | 2014-04-23 | 太原理工大学 | Method for re-mining residual floor coal in fully-mechanized top coal caving face |
| CN104153750A (en) * | 2014-08-20 | 2014-11-19 | 北京中科诚毅科技发展有限公司 | Method for generating coal gas underground through air fracture and micro negative pressure |
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