CN109026129A - Height negative pressure line intelligent conversion control technique - Google Patents
Height negative pressure line intelligent conversion control technique Download PDFInfo
- Publication number
- CN109026129A CN109026129A CN201810927039.6A CN201810927039A CN109026129A CN 109026129 A CN109026129 A CN 109026129A CN 201810927039 A CN201810927039 A CN 201810927039A CN 109026129 A CN109026129 A CN 109026129A
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- negative pressure
- charge
- gas drainage
- general pipeline
- extraction
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 36
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000605 extraction Methods 0.000 claims description 61
- 239000003245 coal Substances 0.000 claims description 23
- 230000000750 progressive effect Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005457 optimization 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
- 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 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
-
- 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
- E21F17/18—Special adaptations of signalling or alarm devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to height negative pressure line intelligent conversion control techniques, the present invention is according to group forming criterion, gas drilling is grouped, on-line monitoring to each group of carry out carbonomonoxide concentration, methane concentration, negative pressure, temperature and flow, while every group is attached by high and low negative pressure adjusted and controlled valve and high and low negative pressure general pipeline respectively.The case where being monitored according to every group of sensor carries out the intelligent conversion between high and low negative pressure general pipeline, improves gas drainage efficiency, reduce operation cost.
Description
Technical field
The invention belongs to coal mine gas drainage technical fields, and in particular to regulate and control skill for height negative pressure line intelligent conversion
Art.
Background technique
Gas drainage is to gather region to coal seam and gas to drill, and drilling is connect on dedicated pipeline, will with vacuum pump
Gas in coal seam and goaf is evacuated to ground, is used；Or it is emitted into total return.Mash gas extraction is not only to reduce and open
Gas emission during adopting prevents gas exceeding limit and accumulation, pre- anti-gas explosion and coal and gas prominent accident it is important
Measure can also turn bane into boon, and the resource as coal association is developed and used.
Existing mine according to the position of mash gas pumping drilling, is laid with methane gas extraction pipeline mostly in advance, and is connected to
On high negative pressure general pipeline or lower negative pressure general pipeline, it cannot be converted between the two during extraction.But with mining work activities it is continuous into
Row, the negative pressure in some extraction places are also changing, are at this moment needing to carry out the conversion between high and low negative pressure, to deploy resource, reach
To energy-efficient purpose.
Summary of the invention
The technical problem to be solved by the present invention is a kind of height negative pressure line intelligent conversion control technique is provided, the present invention
According to group forming criterion, gas drilling is grouped, to each group of carry out carbonomonoxide concentration, methane concentration, negative pressure, temperature with
And the on-line monitoring of flow, while every group passes through control valve respectively and is attached with high and low negative pressure general pipeline.According to every group of sensing
The case where device monitors carries out the intelligent conversion between high and low negative pressure general pipeline, improves gas drainage efficiency, reduce operation
Cost.
The present invention solve the problems, such as it is of the existing technology used by technical solution be:
Height negative pressure line intelligent conversion control technique divides each extraction place in mine inside according to group forming criterion
Group, hole sealing tube and pipe laying are all connected in parallel on a gas drainage and are in charge of in each group of drilling for being included.
The group forming criterion includes:
Principle one: it is grouped by extraction place each inside mine；
Principle two: it is grouped according to the propulsion span length in extraction place single inside mine.
Every gas drainage is in charge of to be attached by high negative pressure control valve and high negative pressure general pipeline respectively, and every gas is taken out
It adopts to be in charge of and be attached respectively by lower negative pressure control valve and lower negative pressure general pipeline.
According to drilling and the position of pipe laying, in advance by the gas drainage point with part drilling and pipe laying perforation connection
Pipe is connected by opening high negative pressure control valve and high negative pressure general pipeline perforation, and is closed and be in charge of the low negative of connection with the gas drainage
Pressure control valve door realizes that the gas drainage is in charge of the barrier with lower negative pressure general pipeline, or by open lower negative pressure control valve with it is low
Negative pressure general pipeline perforation connection, and the high negative pressure control valve for being in charge of connection with the gas drainage is closed, realize the gas drainage point
The barrier of pipe and high negative pressure general pipeline.
Every gas drainage, which is in charge of, is equipped with B/P EGR Back Pressure Transducer EGR, and the every 1~20s of the B/P EGR Back Pressure Transducer EGR is passed to control device
One group of negative pressure data is passed, the lower negative pressure control valve, high negative pressure control valve and B/P EGR Back Pressure Transducer EGR are filled with control respectively
Set electric connection.
In one cycle, every gas drainage is in charge of B/P EGR Back Pressure Transducer EGR institute measured data and meets high and low negative pressure line extraction
When switch condition, high negative pressure general pipeline is carried out to it or is converted with the connection of lower negative pressure general pipeline.
The high and low negative pressure extraction switch condition is as follows:
When the B/P EGR Back Pressure Transducer EGR that the gas drainage connecting with high negative pressure general pipeline is in charge of is to fill in T to control in the duration
Set negative pressure numerical value < P in the data of transmitting quantity be more than or equal to data count amount 70% when, close the gas drainage and be in charge of
High negative pressure control valve between high negative pressure general pipeline opens the lower negative pressure control that the gas drainage is in charge of between lower negative pressure general pipeline
Valve processed is converted into lower negative pressure extraction；
When the B/P EGR Back Pressure Transducer EGR that the gas drainage connecting with lower negative pressure general pipeline is in charge of when the duration is in T to control
When the quantity of negative pressure numerical value > P is more than or equal to the 70% of data count amount in the data of device transmitting, the gas drainage point is closed
Lower negative pressure control valve between pipe and lower negative pressure general pipeline, opens the high negative pressure that the gas drainage is in charge of between high negative pressure general pipeline
Control valve is converted into high negative pressure extraction.
Preferably, the B/P EGR Back Pressure Transducer EGR institute measured data quantity that high and low negative pressure extraction switching condition is met within T is less than always
Quantity 70% when, regard as sensor fault, need artificial site inspection sensor condition.
Preferably, the P is 5~15kpa.
Preferably, the T is 10~30 hours.
Preferably, it the principle one in the group forming criterion: is grouped by extraction place each inside mine, each mine
Hole sealing tube and pipe laying are individually connected in parallel on a gas drainage and are in charge of in the drilling that extraction place is included in well.With goaf
Lower negative pressure opens the angle goaf Shang Ou pipe laying, goaf lower negative pressure close the goaf pipe laying, goaf branch pipe suction road drilling phase
Gas drainage even, which is in charge of, to be connected in parallel on lower negative pressure general pipeline.Extend extraction with stone door punching coal in exploiting field and tunnel, highly concentrated bottom is taken out
Lane extraction borehole, high-order horizontal drilling and high-order fissure zone drilling, this coal seam driving are taken out in advance and the progressive extraction in region is bored
Hole, fissure zone driving be pre- take out and the progressive extraction borehole in region, the drilling of this drainage from coal seam of stope, stope with
And the connected gas drainage of fissure zone extraction borehole is in charge of and is connected in parallel on high negative pressure general pipeline.
Preferably, the principle two in the group forming criterion: inside mine the propulsion span length in single extraction place into
Row grouping is directed to the drilling of this drainage from coal seam of stope, when stope this drainage from coal seam drill site direction of propulsion
When greater than 50m, the drilling between 20~50m of direction of propulsion span can be connected in parallel on a gas drainage and be in charge of, then passed through
Control valve is connect with high negative pressure general pipeline.
Preferably, the gas drainage be in charge of be also equipped with carbonomonoxide concentration sensor, sensing methane concentration device,
Temperature sensor and flow sensor, the carbonomonoxide concentration sensor, sensing methane concentration device, temperature sensor with
And flow sensor and control device are electrically connected.
Compared with prior art, the present invention possessed by the utility model has the advantages that
(1) gas drainage in each extraction place in mine inside can be in charge of and is monitored online, cut operating costs.
(2) each gas drainage may be implemented it is in charge of between high and low negative pressure general pipeline to carry out intelligent conversion, optimization resource benefit
With raising gas drainage efficiency.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is a kind of gas drainage grouping regulation pipeline schematic diagram of the present invention,
Specific embodiment
Attached drawing is the most preferred embodiment of the height negative pressure line intelligent conversion control technique, with reference to the accompanying drawing to the present invention
Further details of explanation.
Height negative pressure line intelligent conversion control technique, a kind of height negative pressure line intelligent conversion regulation method, to mine
Internal each extraction place is grouped according to group forming criterion, and hole sealing tube and pipe laying are all connected in parallel in each group of drilling for being included
One gas drainage is in charge of.
The group forming criterion includes:
Principle one: it is grouped by extraction place each inside mine:
Wherein each extraction place includes: stone door punching coal and tunnel extension extraction, the highly concentrated lane Di Chou in exploiting field inside mine
Extraction borehole, high position horizontal drilling and high-order fissure zone drilling, the pre- pumping of this coal seam driving and the progressive extraction borehole in region,
Fissure zone driving is pre- take out and the progressive extraction borehole in region, the drilling of this drainage from coal seam of stope, stope and
Fissure zone extraction borehole, goaf the lower negative pressure open angle goaf Shang Ou pipe laying, are adopted goaf lower negative pressure close the goaf pipe laying
Dead zone branch pipe suction road drills, and hole sealing tube and pipe laying are individually connected in parallel in the drilling that extraction place is included in each mine
A piece gas drainage is in charge of.
With goaf the lower negative pressure open angle goaf Shang Ou pipe laying, goaf lower negative pressure close the goaf pipe laying, goaf
The connected gas drainage of branch pipe suction road drilling, which is in charge of, to be connected in parallel on lower negative pressure general pipeline.
With stone door punching coal in exploiting field and tunnel extend extraction, the highly concentrated lane Di Chou extraction borehole, high-order horizontal drilling and
Pre- pumping is tunneled in high-order fissure zone drilling, this coal seam and the progressive extraction borehole in region, the pre- pumping of fissure zone driving and region are passed
The gas being connected into formula extraction borehole, the drilling of this drainage from coal seam of stope, stope and fissure zone extraction borehole
Extraction, which is in charge of, to be connected in parallel on high negative pressure general pipeline.
Principle two: it is grouped according to the propulsion span length in extraction place single inside mine:
It drills mainly in this drainage from coal seam of stope, when stope this drainage from coal seam drill site promotes
When direction is greater than 50m, the drilling between 20~50m of direction of propulsion span can be connected in parallel on a gas drainage and be in charge of, then
It is connect by control valve with high negative pressure general pipeline.When certain extraction place direction of propulsion span is greater than 50m inside mine, equally will
Drilling between 20~50m of direction of propulsion span is connected in parallel on a gas drainage and is in charge of.
Every gas drainage is in charge of to be attached by high negative pressure control valve and high negative pressure general pipeline respectively, and every gas is taken out
It adopts to be in charge of and be attached respectively by lower negative pressure control valve and lower negative pressure general pipeline.
According to drilling and the position of pipe laying, in advance by the gas drainage point with part drilling and pipe laying perforation connection
Pipe is connected by opening high negative pressure control valve and high negative pressure general pipeline perforation, and closes lower negative pressure control valve, or pass through unlatching
Lower negative pressure control valve and lower negative pressure general pipeline perforation connect, and close high negative pressure control valve.
Every gas drainage, which is in charge of, is equipped with B/P EGR Back Pressure Transducer EGR, and the every 1~20s of the B/P EGR Back Pressure Transducer EGR is passed to control device
One group of negative pressure data is passed, the lower negative pressure control valve, high negative pressure control valve and B/P EGR Back Pressure Transducer EGR are filled with control respectively
Set electric connection.
In one cycle, every gas drainage is in charge of B/P EGR Back Pressure Transducer EGR institute measured data and meets high and low negative pressure line extraction
When turning switching condition, high negative pressure general pipeline is carried out to it or is converted with the connection of lower negative pressure general pipeline.
The high and low negative pressure extraction switch condition is as follows:
When the B/P EGR Back Pressure Transducer EGR that the gas drainage connecting with high negative pressure general pipeline is in charge of is to fill in T to control in the duration
Set negative pressure numerical value < P in the data of transmitting quantity be more than or equal to data count amount 70% when, close the gas drainage and be in charge of
High negative pressure control valve between high negative pressure general pipeline opens the lower negative pressure control that the gas drainage is in charge of between lower negative pressure general pipeline
Valve processed is converted into lower negative pressure extraction；
When the B/P EGR Back Pressure Transducer EGR that the gas drainage connecting with lower negative pressure general pipeline is in charge of when the duration is in T to control
When the quantity of negative pressure numerical value > P is more than or equal to the 70% of data count amount in the data of device transmitting, the gas drainage point is closed
Lower negative pressure control valve between pipe and lower negative pressure general pipeline, opens the high negative pressure that the gas drainage is in charge of between high negative pressure general pipeline
Control valve is converted into high negative pressure extraction.
The B/P EGR Back Pressure Transducer EGR institute measured data quantity for meeting high and low negative pressure extraction switching condition within T is less than total quantity
When 70%, sensor fault is regarded as, needs artificial site inspection sensor condition.
Wherein, the P is 5~15kpa, and the T is 10~30 hours.
Such as: P takes 10kpa, T to take 24 hours, and every gas drainage is in charge of the every 10s of B/P EGR Back Pressure Transducer EGR and is transmitted to control device
One group of data, for 24 hours within altogether transmitting 8640 groups of data, when the data bulk for wherein meeting high and low negative pressure extraction switching condition
When more than or equal to 6048 groups, this is in charge of the switching for carrying out high and low negative pressure general pipeline.Switch item when wherein meeting high and low negative pressure extraction
When the data bulk of part is less than 6048 groups, sensor fault is regarded as, needs artificial ready-made inspection sensor condition.
The gas drainage, which is in charge of, is also equipped with carbonomonoxide concentration sensor, sensing methane concentration device, temperature biography
Sensor and flow sensor, the carbonomonoxide concentration sensor, sensing methane concentration device, temperature sensor and flow
Sensor and control device are electrically connected.
When certain root gas drainage is in charge of internal negative pressure is constant, methane concentration is constant, flow reaches 1mL/min when, close simultaneously
It closes the gas drainage and is in charge of connected high and low vacuum cavitations valve.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode, technical field those of ordinary skill within the scope of knowledge, present inventive concept can also not departed from
Under the premise of various changes can be made.
Claims (7)
1. height negative pressure line intelligent conversion control technique, it is characterised in that:
Each extraction place in mine inside is grouped according to group forming criterion, hole sealing tube and is buried in each group of drilling for being included
Pipe is all connected in parallel on a gas drainage and is in charge of,
The group forming criterion includes:
Principle one: it is grouped by extraction place each inside mine；
Principle two: being grouped according to the propulsion span length in extraction place single inside mine,
Every gas drainage is in charge of to be attached by high negative pressure control valve and high negative pressure general pipeline respectively, every gas drainage point
Pipe passes through lower negative pressure control valve respectively and is attached with lower negative pressure general pipeline,
According to drilling and the position of pipe laying, will be in charge of in advance with the gas drainage of part drilling and pipe laying perforation connection logical
It crosses unlatching high negative pressure control valve and high negative pressure general pipeline perforation connects, and close the lower negative pressure control for being in charge of connection with the gas drainage
Valve processed realizes that the gas drainage is in charge of the barrier with lower negative pressure general pipeline, or by opening lower negative pressure control valve and lower negative pressure
General pipeline perforation connection, and close and be in charge of the high negative pressure control valve of connection with the gas drainage, realize the gas drainage be in charge of with
The barrier of high negative pressure general pipeline,
Every gas drainage, which is in charge of, is equipped with B/P EGR Back Pressure Transducer EGR, and the every 1~20s of the B/P EGR Back Pressure Transducer EGR transmits one to control device
Group negative pressure data, the lower negative pressure control valve, high negative pressure control valve and B/P EGR Back Pressure Transducer EGR are electric with control device respectively
Property connection,
In one cycle, every gas drainage is in charge of B/P EGR Back Pressure Transducer EGR institute measured data and meets high and low negative pressure line extraction conversion
When condition, high negative pressure general pipeline is carried out to it or is converted with the connection of lower negative pressure general pipeline,
The high and low negative pressure extraction switch condition is as follows:
When the B/P EGR Back Pressure Transducer EGR that the gas drainage connecting with high negative pressure general pipeline is in charge of is to pass in T to control device in the duration
When the quantity of negative pressure numerical value < P is more than or equal to the 70% of data count amount in the data passed, closes the gas drainage and be in charge of and height
High negative pressure control valve between negative pressure general pipeline opens the lower negative pressure control valve that the gas drainage is in charge of between lower negative pressure general pipeline
Door, is converted into lower negative pressure extraction；
When the B/P EGR Back Pressure Transducer EGR that the gas drainage connecting with lower negative pressure general pipeline is in charge of when the duration is in T to control device
In the data of transmitting the quantity of negative pressure numerical value > P be more than or equal to data count amount 70% when, close the gas drainage be in charge of with
Lower negative pressure control valve between lower negative pressure general pipeline opens the high negative pressure control that the gas drainage is in charge of between high negative pressure general pipeline
Valve is converted into high negative pressure extraction.
2. height negative pressure line intelligent conversion control technique according to claim 1, it is characterised in that:
The B/P EGR Back Pressure Transducer EGR institute measured data quantity for meeting high and low negative pressure extraction switching condition within T is less than the 70% of total quantity
When, sensor fault is regarded as, artificial site inspection sensor condition is needed.
3. height negative pressure line intelligent conversion control technique according to claim 1, it is characterised in that:
The P is 5~15kpa.
4. height negative pressure line intelligent conversion control technique according to claim 1, it is characterised in that:
The T is 10~30 hours.
5. height negative pressure line intelligent conversion control technique according to claim 1, it is characterised in that:
Principle one in the group forming criterion: being grouped by extraction place each inside mine, extraction in each mine
Hole sealing tube and pipe laying are individually connected in parallel on a gas drainage and are in charge of in the included drilling of point,
With goaf the lower negative pressure open angle goaf Shang Ou pipe laying, goaf lower negative pressure close the goaf pipe laying, goaf branch pipe
The connected gas drainage of suction road drilling, which is in charge of, to be connected in parallel on lower negative pressure general pipeline,
Extend extraction, the highly concentrated lane Di Chou extraction borehole, high-order horizontal drilling and a high position with stone door punching coal in exploiting field and tunnel
Pre- pumping is tunneled in fissure zone drilling, this coal seam and the progressive extraction borehole in region, the pre- pumping of fissure zone driving and region are progressive
The gas drainage that extraction borehole, the drilling of this drainage from coal seam of stope, stope and fissure zone extraction borehole are connected
It is in charge of and is connected in parallel on high negative pressure general pipeline.
6. height negative pressure line intelligent conversion control technique according to claim 1, it is characterised in that:
Principle two in the group forming criterion: the propulsion span length in single extraction place is grouped inside mine, for
It drills in this drainage from coal seam of stope, it, can when stope this drainage from coal seam drill site direction of propulsion is greater than 50m
Drilling between 20~50m of direction of propulsion span is connected in parallel on a gas drainage to be in charge of, then passes through control valve and height
Negative pressure general pipeline connection.
7. height negative pressure line intelligent conversion control technique according to claim 1, it is characterised in that:
The gas drainage, which is in charge of, is also equipped with carbonomonoxide concentration sensor, sensing methane concentration device, temperature sensor
And flow sensor, the carbonomonoxide concentration sensor, sensing methane concentration device, temperature sensor and flow sensing
Device and control device are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810927039.6A CN109026129A (en) | 2018-08-15 | 2018-08-15 | Height negative pressure line intelligent conversion control technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810927039.6A CN109026129A (en) | 2018-08-15 | 2018-08-15 | Height negative pressure line intelligent conversion control technique |
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| Publication Number | Publication Date |
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| CN109026129A true CN109026129A (en) | 2018-12-18 |
Family
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| CN201810927039.6A Pending CN109026129A (en) | 2018-08-15 | 2018-08-15 | Height negative pressure line intelligent conversion control technique |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736878A (en) * | 2019-01-11 | 2019-05-10 | 微山金源煤矿 | It is a kind of nobody automatic mash gas extraction system |
| CN111577282A (en) * | 2020-05-26 | 2020-08-25 | 内蒙古福城矿业有限公司 | High-low negative pressure separate source coal mine gas drainage process |
| CN111810224A (en) * | 2020-07-21 | 2020-10-23 | 河南平宝煤业有限公司 | Deep coal resource development method integrating gas treatment, extraction and utilization |
| CN113356918A (en) * | 2021-08-03 | 2021-09-07 | 贵州盘江精煤股份有限公司 | Method for draining gas by low-negative-pressure short-hole closure |
| CN113513361A (en) * | 2021-08-10 | 2021-10-19 | 北京大学 | Method and system for regulating and controlling gas concentration of stope face of high-gas coal mine |
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| CN108343466A (en) * | 2018-02-11 | 2018-07-31 | 辽宁工程技术大学 | It is a kind of can automatic shunt high-concentration and low-concentration methane gas device and its shunt method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109736878A (en) * | 2019-01-11 | 2019-05-10 | 微山金源煤矿 | It is a kind of nobody automatic mash gas extraction system |
| CN111577282A (en) * | 2020-05-26 | 2020-08-25 | 内蒙古福城矿业有限公司 | High-low negative pressure separate source coal mine gas drainage process |
| CN111810224A (en) * | 2020-07-21 | 2020-10-23 | 河南平宝煤业有限公司 | Deep coal resource development method integrating gas treatment, extraction and utilization |
| CN113356918A (en) * | 2021-08-03 | 2021-09-07 | 贵州盘江精煤股份有限公司 | Method for draining gas by low-negative-pressure short-hole closure |
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| CN113513361B (en) * | 2021-08-10 | 2022-04-29 | 北京大学 | Method and system for regulating and controlling gas concentration of stope face of high-gas coal mine |
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Application publication date: 20181218 |
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| RJ01 | Rejection of invention patent application after publication |