CN109519212A - The device and method of major diameter horizontal drilling bridge joint goaf mash gas extraction - Google Patents
The device and method of major diameter horizontal drilling bridge joint goaf mash gas extraction Download PDFInfo
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- CN109519212A CN109519212A CN201910054867.8A CN201910054867A CN109519212A CN 109519212 A CN109519212 A CN 109519212A CN 201910054867 A CN201910054867 A CN 201910054867A CN 109519212 A CN109519212 A CN 109519212A
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- goaf
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- gas
- major diameter
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- 238000000605 extraction Methods 0.000 title claims abstract description 77
- 238000005553 drilling Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003245 coal Substances 0.000 claims abstract description 50
- 238000010276 construction Methods 0.000 claims abstract description 19
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 229920000742 Cotton Polymers 0.000 claims description 18
- 229920002635 polyurethane Polymers 0.000 claims description 17
- 239000004814 polyurethane Substances 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 8
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 64
- 238000005065 mining Methods 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Abstract
The present invention relates to a kind of device and methods of major diameter horizontal drilling bridge joint goaf mash gas extraction, belong to coal mine gas security technology area.The device includes casing, butterfly valve, threeway and extraction pipeline；Butterfly valve is mounted in described sleeve pipe, and described sleeve pipe is connect by threeway with extraction pipeline；Casing is placed to inside horizontal drilling；The horizontal drilling construction penetrates coal column on the coal column between the Belt transport crossheading of stope and the air intake duct of Adjacent Working Face；Flow, temperature, gas and carbon monoxide gas concentration measurement device are installed, for level monitoring drilling bridge joint goaf mash gas extraction situation on extraction pipeline.The present invention solves the problems, such as the high-intensitive stope Air return corner gas control under the conditions of inclined Y-shaped draft type, realize the multiple meeting points of goaf gas, continuous controllable extraction, while effectively control corner Gas, spontaneous combustion in goaf is monitored in real time.
Description
Technical field
The invention belongs to technical field of mine safety, are related to the device of major diameter horizontal drilling bridge joint goaf mash gas extraction
And method.
Background technique
Adjustable, controllable and identification gas the real-time monitoring of goaf gas extraction amount is effective control Residual coal in goaf
Spontaneous combustion, the important leverage for preventing underground coal mine stope gas at upper corner concentration from transfiniting.Currently, China's Ordos Basin
The main mining coal seam of most of highly gassy mines of NORTHEAST MARGIN belongs to two class spontaneous progress, and the phase of being under fire is 4~6 months.And coal seam fully mechanized mining
Caving coal mining working face intake is generally 2000m3/ min, return air air quantity are about 1600m3/ min, therefore, with regard to such mine well
For lower coal stope, goaf air leaking brought by gas drainage most probably leads to spontaneous combustion in goaf, and
And coal body spontaneous combustion becomes the ignition source of gas combustion and gas explosion again, not only seriously affects gas safety extraction, but also at
For the great risk source of shaft production；In turn, in prevention and treatment spontaneous combustion process, the goaf taken and coal body are blocked, and are reduced
It leaks out and loose coal perfusion fire extinguishing yellow mud colloid forms the measures such as isolation strip, be unfavorable for goaf gas extraction.Cause
This fully considers control of the goaf gas extraction to face gas effusion intensity in taking preventing spontaneous combustion of coal measure,
During gas drainage, goaf air leaking control prevention and treatment freely burning fire is taken into account, becomes and exists simultaneously gas and spontaneous combustion disaster mine
Well realizes the crucial problem of safety in production.
In view of this, the present invention is under the conditions of two class spontaneous combustion high seam high tension coal mining of China's Eastern Margin of Ordos Basin
Goaf gas administer problem, propose use major diameter horizontal drilling construction technology, by major diameter horizontal drilling bridge it is mined out
Area's mash gas extraction technique is applied to the improvement of face upper corner angle gas, realize the multiple meeting points of fully mechanized coal face return side it is continuous,
Controllable extraction.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of dresses of major diameter horizontal drilling bridge joint goaf mash gas extraction
It sets and method, for solving the difficulty of the high-intensitive stope Air return corner gas control under the conditions of inclined Y-shaped draft type
Topic realizes that the multiple meeting points of goaf gas, continuous controllable extraction can be to mined out while effectively control corner Gas
Area's spontaneous combustion of remaining coal is monitored in real time, and effective prevention and control to the compound disaster of mine are realized.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of device of major diameter horizontal drilling bridge joint goaf mash gas extraction, including casing, butterfly valve, threeway and drainage tube
Road；
The butterfly valve is mounted in described sleeve pipe, and described sleeve pipe is connect by threeway with extraction pipeline；
Described sleeve pipe is placed to inside horizontal drilling；Belt transport crossheading of the horizontal drilling construction in stope
On coal column between the air intake duct of Adjacent Working Face, and penetrate coal column；
Flow, temperature, gas and carbon monoxide gas concentration measurement device are installed, for supervising on the extraction pipeline
It surveys horizontal drilling and bridges goaf mash gas extraction situation.
Further, the length of the coal column between the Belt transport crossheading of the stope and the air intake duct of Adjacent Working Face
Degree is 150~200m, and the width of coal column is 20m, is the connection roadway of perforation between coal column.
Further, the horizontal drilling diameter is 113mm, and the spacing of drilling is 5~10m, construction 14 on each coal column~
19 major diameter horizontal drillings.
Further, it is wound with cotton yarn in described sleeve pipe, there is a certain amount of polyurethane mixed solution on the cotton yarn, to poly-
After the reaction of urethane mixed solution, solidification, horizontal drilling inner wall is sticky with casing, seal is formed, for completely cutting off air
Intake.
Further, the method suitable for the major diameter horizontal drilling bridge joint goaf mash gas extraction of described device is specific to wrap
Include following steps:
S1: on the coal column between the Belt transport crossheading of stope and the air inlet crossheading of Adjacent Working Face, construction
The horizontal drilling of major diameter；
S2: the horizontal drilling of the major diameter of the construction penetrates coal column, after construction, enters casing to embedded in hole；
S3: winding cotton yarn in described sleeve pipe, and a certain amount of polyurethane mixed solution is poured on cotton yarn, mixed to polyurethane
After closing solution reaction, solidification, effective closure to casing is realized；
S4: installing butterfly valve in described sleeve pipe, the extraction negative pressure to controlled level drilling；
S5: the casing for being equipped with butterfly valve is connected with threeway；
S6: the threeway connects extraction pipeline, and flow, temperature, gas and an oxidation are installed on the extraction pipeline
Carbon gas concentration measuring device, for monitoring major diameter horizontal drilling bridge joint goaf mash gas extraction situation.
Further, the step S3 specifically includes the following steps:
S31: winding cotton yarn on casing, and then mixed polyurethane solutions are poured on cotton yarn, rapidly put casing
Enter into drilling；
S32: after the polyurethane solutions after to be mixed sufficiently react, solidify, drill hole inner wall and casing being sticky, shape
At seal, to completely cut off the intake of air, the reduction of mash gas extraction concentration is prevented.
Further, in the step S5, the control method of the butterfly valve are as follows:
(1) initial stage of extraction opens butterfly valve, and making the gas in goaf, inflow is horizontal under the action of negative pressure in extraction pipeline
In drilling；Meanwhile the feelings of the gas by being set on extraction pipeline, carbon monoxide gas concentration sensor monitoring mash gas extraction
Condition；
(2) if finding the opening and closing degree of CO gas, closing or regulating butterfly valve in extraction pipeline, goaf is reduced
Interior leaks out, and prevents from losing coal generation spontaneous combustion.
The beneficial effects of the present invention are:
(1) gas at upper corner that the present invention can be used for implementing during underground coal mine coal stope promotes is administered, should
Technique is the drilling constructed in coal column using major diameter horizontal drilling construction technology and bridge goaf, and suitable on standby mining face
The extraction pipeline of the Large Diameter Pipeline laid in slot, and then ejectment goaf gas play the role of interfering flow field in goaf；
(2) present invention may replace connection lane, and realize completely isolated between crossheading on goaf and standby mining face, keep away
Goaf high concentration gas is exempted from and has flowed directly into crossheading on standby mining face, has fundamentally solved what return air gas density transfinited
Problem；Bridge line accesses the extraction negative pressure at goaf and is much larger than ventilation negative pressure in the place's of traversing under the conditions of inclined Y-shaped ventilating system,
And extraction amount is big, can the more inclined Y-shaped ventilating system goaf deep return air side region high concentration gas that more effectively shuts off pour in
Working face；
(3) present invention accesses goaf using multiple bridge lines, realizes the multiple meeting points of goaf return air side region and takes out
It adopts and working face near zone and the continuous extraction simultaneously of goaf deep, reduces goaf gas effusion intensity；It accesses mined out
The bridge line in area is accessed using multiple pipeline parallel connections, is effectively reduced the local resistance of extraction pipeline, is increased gas drainage
Amount, strengthens the control to goaf gas flow field；
(4) present invention is compared with traditional High Position Drilling, and drilling construction project amount is small, and goaf mash gas extraction amount is big,
It can be effectively controlled goaf gas flow field, prevent face upper corner angle gas exceeding limit；Each major diameter horizontal drilling and drainage tube
Road is connected, and can real time on-line monitoring Residual coal in goaf spontaneous fire identification gas concentration, accomplish conscientiously to mine coal
Effective pre-control of charcoal goaf in working faces coal spontaneous combustion；Major diameter horizontal drilling and extraction pipeline connection, are installed on tune
Butterfly valve is controlled, to control hole pumping and mining gas negative pressure, so that hole pumping and mining gas amount is realized precisely, effectively controllably, is prevented because adopting
Dead zone mash gas extraction amount is excessive, and the air intake caused causes spontaneous combustion of remaining coal.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is the integral construction position view of device of the present invention；
Fig. 2 is the level schematic diagram of device of the present invention；
Fig. 3 is the A-A diagrammatic cross-section of Fig. 2；
Fig. 4 is the connection schematic diagram of pipeline and drainage tube.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
As shown in figures 1-4, a kind of device of major diameter horizontal drilling bridge joint goaf mash gas extraction, including casing, butterfly
Valve, threeway and extraction pipeline；The butterfly valve is mounted in described sleeve pipe, and described sleeve pipe is connect by threeway with extraction pipeline；Institute
Casing is stated to be placed to inside horizontal drilling；Belt transport crossheading and operated adjacent of the horizontal drilling construction in stope
On coal column between the air intake duct in face, and penetrate coal column；Flow, temperature, gas and an oxygen are installed on the extraction pipeline
Change carbon gas concentration measuring device, for level monitoring drilling bridge joint goaf mash gas extraction situation.
The length of coal column between the Belt transport crossheading of stope and the air intake duct of Adjacent Working Face be 150~
200m, the width of coal column are 20m, are the connection roadway of perforation between coal column.Horizontal drilling diameter is 113mm, and the spacing of drilling is 5
~10m, 14~19 major diameter horizontal drillings of constructing on each coal column.It is wound with cotton yarn on casing, has one on the cotton yarn
Quantitative polyurethane mixed solution plays horizontal drilling inner wall and casing adhesion after the reaction of polyurethane mixed solution, solidification
Come, seal is formed, for completely cutting off the intake of air.
The method that major diameter horizontal drilling bridges goaf mash gas extraction, specifically includes the following steps:
S1: on the coal column between the Belt transport crossheading of stope and the air inlet crossheading of Adjacent Working Face, construction
The horizontal drilling of major diameter；
S2: the horizontal drilling of the major diameter of the construction penetrates coal column, after construction, enters casing to embedded in hole；
S3: winding cotton yarn in described sleeve pipe, and a certain amount of polyurethane mixed solution is poured on cotton yarn, mixed to polyurethane
After closing solution reaction, solidification, effective closure to casing is realized；Specifically:
S31: winding cotton yarn on casing, and then mixed polyurethane solutions are poured on cotton yarn, rapidly put casing
Enter into drilling；
S32: after the polyurethane solutions after to be mixed sufficiently react, solidify, drill hole inner wall and casing being sticky, shape
At seal, to completely cut off the intake of air, the reduction of mash gas extraction concentration is prevented.
S4: installing butterfly valve in described sleeve pipe, the extraction negative pressure to controlled level drilling；
S5: the casing for being equipped with butterfly valve is connected with threeway；The wherein control method of butterfly valve are as follows:
(1) initial stage of extraction opens butterfly valve, and making the gas in goaf, inflow is horizontal under the action of negative pressure in extraction pipeline
In drilling；Meanwhile the feelings of the gas by being set on extraction pipeline, carbon monoxide gas concentration sensor monitoring mash gas extraction
Condition；
(2) if finding the opening and closing degree of CO gas, closing or regulating butterfly valve in extraction pipeline, goaf is reduced
Interior leaks out, and prevents from losing coal generation spontaneous combustion.
S6: the threeway connects extraction pipeline, and flow, temperature, gas and an oxidation are installed on the extraction pipeline
Carbon gas concentration measuring device, for monitoring major diameter horizontal drilling bridge joint goaf mash gas extraction situation.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (7)
1. a kind of device of major diameter horizontal drilling bridge joint goaf mash gas extraction, which is characterized in that including casing, butterfly valve, three
Logical and extraction pipeline；
The butterfly valve is mounted in described sleeve pipe, and described sleeve pipe is connect by threeway with extraction pipeline；
Described sleeve pipe is placed to inside horizontal drilling；Belt transport crossheading and phase of the horizontal drilling construction in stope
On coal column between the air intake duct of adjacent working face, and penetrate coal column；
Flow, temperature, gas and carbon monoxide gas concentration measurement device are installed, for monitoring water on the extraction pipeline
Flat drill hole bridges goaf mash gas extraction situation.
2. the device of major diameter horizontal drilling bridge joint goaf mash gas extraction according to claim 1, which is characterized in that institute
The length for stating the coal column between the Belt transport crossheading of stope and the air intake duct of Adjacent Working Face is 150~200m, coal
The width of column is 20m, is the connection roadway of perforation between coal column.
3. the device of major diameter horizontal drilling bridge joint goaf mash gas extraction according to claim 1, which is characterized in that institute
Stating horizontal drilling diameter is 113mm, and the spacing of drilling is 5~10m, and 14~19 major diameter levels of construction are bored on each coal column
Hole.
4. the device of major diameter horizontal drilling bridge joint goaf mash gas extraction according to claim 1, which is characterized in that institute
It states and is wound with cotton yarn on casing, there is a certain amount of polyurethane mixed solution on the cotton yarn, reacted to polyurethane mixed solution,
After solidification, horizontal drilling inner wall is sticky with casing, seal is formed, for completely cutting off the intake of air.
5. the major diameter horizontal drilling for being suitable for any one of Claims 1 to 4 described device bridges goaf mash gas extraction
Method, which is characterized in that this method specifically includes the following steps:
S1: on the coal column between the Belt transport crossheading of stope and the air inlet crossheading of Adjacent Working Face, construction is big straight
The horizontal drilling of diameter；
S2: the horizontal drilling of the major diameter of the construction penetrates coal column, after construction, enters casing to embedded in hole；
S3: winding cotton yarn in described sleeve pipe, and a certain amount of polyurethane mixed solution is poured on cotton yarn, mixes to polyurethane molten
After liquid reaction, solidification, effective closure to casing is realized；
S4: installing butterfly valve in described sleeve pipe, the extraction negative pressure to controlled level drilling；
S5: the casing for being equipped with butterfly valve is connected with threeway；
S6: the threeway connects extraction pipeline, installs flow, temperature, gas and carbon monoxide gas on the extraction pipeline
Bulk concentration measurement device, for monitoring major diameter horizontal drilling bridge joint goaf mash gas extraction situation.
6. the method for major diameter horizontal drilling bridge joint goaf mash gas extraction according to claim 5, which is characterized in that institute
State step S3 specifically includes the following steps:
S31: winding cotton yarn on casing, and then mixed polyurethane solutions are poured on cotton yarn, are rapidly put into casing
In drilling；
S32: after the polyurethane solutions after to be mixed sufficiently react, solidify, drill hole inner wall and casing being sticky, and formed close
Feng Ti prevents the reduction of mash gas extraction concentration to completely cut off the intake of air.
7. the method for major diameter horizontal drilling bridge joint goaf mash gas extraction according to claim 5, which is characterized in that institute
It states in step S5, the control method of the butterfly valve are as follows:
(1) initial stage of extraction opens butterfly valve, the gas in goaf is made to flow into horizontal drilling under the action of negative pressure in extraction pipeline
It is interior；Meanwhile the case where gas by being set on extraction pipeline, carbon monoxide gas concentration sensor monitoring mash gas extraction；
(2) it if finding the opening and closing degree of CO gas, closing or regulating butterfly valve in extraction pipeline, reduces in goaf
It leaks out, prevents from losing coal generation spontaneous combustion.
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|---|---|---|---|
| CN201910054867.8A CN109519212A (en) | 2019-01-21 | 2019-01-21 | The device and method of major diameter horizontal drilling bridge joint goaf mash gas extraction |
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| CN201910054867.8A CN109519212A (en) | 2019-01-21 | 2019-01-21 | The device and method of major diameter horizontal drilling bridge joint goaf mash gas extraction |
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Family
ID=65799296
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810221A (en) * | 2019-04-11 | 2020-10-23 | 河南理工大学 | Method for treating gas on mining face through pumping drainage of U-parallel U + upper corner |
| CN111946395A (en) * | 2020-06-17 | 2020-11-17 | 华能庆阳煤电有限责任公司核桃峪煤矿 | Pressure relief method for preventing air leakage and communicating accumulated water in goaf |
| CN112288589A (en) * | 2020-10-29 | 2021-01-29 | 中煤科工集团重庆研究院有限公司 | Method for measuring gas flow field of goaf by utilizing goaf closed wall extraction data |
| CN112415137A (en) * | 2020-10-29 | 2021-02-26 | 中煤科工集团重庆研究院有限公司 | Method for measuring gas concentration field of goaf by utilizing goaf closed wall extraction data |
| CN113446051A (en) * | 2021-07-30 | 2021-09-28 | 太原理工大学 | Goaf ultrahigh-position drill hole gas extraction method under roof cutting and roadway retaining process |
| CN113790084A (en) * | 2021-09-09 | 2021-12-14 | 西安科技大学 | Coal mine corner rapid plugging and monitoring system and method |
| CN114718517A (en) * | 2022-03-24 | 2022-07-08 | 国能神东煤炭集团有限责任公司 | Method for recycling butterfly valve on gas extraction pipe in coal mining operation |
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| CN108625893A (en) * | 2018-05-29 | 2018-10-09 | 西安科技大学 | A kind of coal mine High Position Drilling pressure relief gas pumping mining intelligent appraisement and regulator control system |
| CN209586428U (en) * | 2019-01-21 | 2019-11-05 | 中煤科工集团重庆研究院有限公司 | The device of major diameter horizontal drilling bridge joint goaf mash gas extraction |
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| CN201723246U (en) * | 2010-07-27 | 2011-01-26 | 山西焦煤集团有限责任公司 | Ventilating structure for pumping and exhausting gas at coal face |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810221A (en) * | 2019-04-11 | 2020-10-23 | 河南理工大学 | Method for treating gas on mining face through pumping drainage of U-parallel U + upper corner |
| CN111810221B (en) * | 2019-04-11 | 2022-05-24 | 河南理工大学 | Method for treating gas on mining face through pumping drainage of U-parallel U + upper corner |
| CN111946395A (en) * | 2020-06-17 | 2020-11-17 | 华能庆阳煤电有限责任公司核桃峪煤矿 | Pressure relief method for preventing air leakage and communicating accumulated water in goaf |
| CN112288589A (en) * | 2020-10-29 | 2021-01-29 | 中煤科工集团重庆研究院有限公司 | Method for measuring gas flow field of goaf by utilizing goaf closed wall extraction data |
| CN112415137A (en) * | 2020-10-29 | 2021-02-26 | 中煤科工集团重庆研究院有限公司 | Method for measuring gas concentration field of goaf by utilizing goaf closed wall extraction data |
| CN112288589B (en) * | 2020-10-29 | 2022-04-08 | 中煤科工集团重庆研究院有限公司 | Method for measuring gas flow field of goaf by utilizing goaf closed wall extraction data |
| CN113446051A (en) * | 2021-07-30 | 2021-09-28 | 太原理工大学 | Goaf ultrahigh-position drill hole gas extraction method under roof cutting and roadway retaining process |
| CN113790084A (en) * | 2021-09-09 | 2021-12-14 | 西安科技大学 | Coal mine corner rapid plugging and monitoring system and method |
| CN114718517A (en) * | 2022-03-24 | 2022-07-08 | 国能神东煤炭集团有限责任公司 | Method for recycling butterfly valve on gas extraction pipe in coal mining operation |
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