CN104696007B - A kind of method improving goaf gas extraction concentration and flow in coal mining process - Google Patents
A kind of method improving goaf gas extraction concentration and flow in coal mining process Download PDFInfo
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- CN104696007B CN104696007B CN201510055365.9A CN201510055365A CN104696007B CN 104696007 B CN104696007 B CN 104696007B CN 201510055365 A CN201510055365 A CN 201510055365A CN 104696007 B CN104696007 B CN 104696007B
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Abstract
A kind of method improving goaf gas extraction concentration and flow in coal mining process, first excavates suction road along working face extraction direction.In working face extraction process, laying gas injecting pipe in air intake lane, gas injecting pipe gas outlet is positioned at the oxidized zone in goaf, and higher than losing coal in goaf.Arranging slip casting baffle plate at the support rear of work surface, lay Grouting Pipe along return airway and work surface, Grouting Pipe is disposed therethrough the filling pipe of baffle plate along work surface.Filling support rear hole area, forms backfilled enclosed wall, it is prevented that the CO injected in goaf2Leak to work surface.In air intake lane along pipeline to goaf in oxidized zone inject liquid CO2Displacement CH4.The present invention improves CH4Extraction concentration and flow.
Description
Technical field
The present invention relates to a kind of method improving goaf gas extraction concentration and flow in coal mining process, belong to goaf gas extraction technical field.
Background technology
Stope upper corner is the place that gas is easiest to assemble, if not taking effective control measures, it is possible to cause gas exceeding limit, even set off an explosion.At present, the method that gas drainage under suction ruling by law reason Gas Accumulation in Upper-Corner by Pulsed transfinites has pipe laying method and suction road method etc..Namely pipe laying extraction method lays pipeline to upper corner, utilizing blower fan operating to produce negative pressure, thus changing eddy current situation near upper corner, being discharged by pipeline ejectment to safety place by high concentration gas near upper corner.Suction road method is merely goaf gas is carried out supratidal pond equally.But because goaf air leaking is more, concentration is low and flow is little to use pipe laying method and suction road method to draw out methane, and effect is unsatisfactory.
Mine fire is one of colliery major casualty, and the colliery of China 56% exists spontaneous combustion problem, and wherein, Study on Protection of Spontaneous Combustion accounts for the principal status of public economy.Therefore, it is badly in need of seeking a kind of to improve goaf gas extraction concentration and flow and the method being prevented from spontaneous combustion of remaining coal.
Summary of the invention
In order to improve gas extraction concentration and flow in goaf, and solving the problem of spontaneous combustion of remaining coal in goaf, the present invention provides a kind of method improving goaf gas extraction concentration and flow in coal mining process.
Technical scheme: the method improving goaf gas extraction concentration and flow in coal mining process, specifically comprises the following steps that
A, from 30 ~ 50m above coal seam (1) top board, and between return airway (2) and air intake lane (5) and distance return airway 20 ~ 40m place, along work surface (3) mining direction excavation suction road (4)；
In b, working face extraction process, laying diameter in air intake lane is the gas injecting pipe of 30～50cm, and gas injecting pipe gas outlet is positioned at the oxidized zone in goaf, and from heat-radiation belt 10～20m, and it is positioned at 0.3～0.6m above the something lost coal of goaf；
C, slip casting baffle plate is set at the support rear of work surface.Placing grouting pump in return airway, grouting pump outlet is connected to the first valve.Laying diameter along return airway and work surface is the Grouting Pipe of 30～45cm, and Grouting Pipe entrance is connected with grouting pump, and Grouting Pipe is disposed therethrough the filling pipe of baffle plate along work surface every 30～50m；
D, open the first valve, start filling support rear hole area, and form the backfilled enclosed wall of 2～5m, close the first valve；
E, gas injecting pipe are connected with the CO2 air accumulator in air intake lane through the second valve.Open the first valve to start to inject CO2, by suction road, gas in goaf is carried out extraction simultaneously.
Beneficial effects of the present invention:
(1) gas injecting pipe outlet is positioned at the oxidized zone in goaf, and higher than something lost coal in goaf, can avoid the phenomenon that pipe outlet is blocked, pipeline is subject to crushing.
(2) support rear hole area is carried out filling, form backfilled enclosed wall, the CO injected in goaf can be prevented2Leak to work surface, it is prevented that human body is damaged.
(3) liquid CO is injected to goaf internal oxidition band2, can directly reduce temperature and oxygen concentration in oxidized zone, it is prevented that residual coal spontaneous combustion in goaf.
(4) because of CO2Density more than CH4, and crush coal petrography in goaf to CO2Adsorptivity higher, can the CH of broken coal petrography absorption originally in goaf4Displace, and drive to top, goaf, carry out extraction then through suction road, improve extraction concentration and flow.
Accompanying drawing explanation
Fig. 1 is principles of the invention schematic diagram
Fig. 2 is A-A profile in Fig. 1
In figure: 1 coal seam, 2 return airways, 3 work surfaces, 4 suction road, 5 air intake lanes,
6 gas injecting pipes, 7 goafs, 8 oxidized zones, 9 something lost coals, 10 heat-radiation belts,
11 supports, 12 slip casting baffle plates, 13 grouting pumps, 14 first valves, 15 Grouting Pipe, 16 filling pipes, 17 backfilled enclosed walls, 18 second valves, 19 CO2Air accumulator.
Detailed description of the invention
Below in conjunction with accompanying drawing, the example of the present invention is further described:
Shown in Fig. 1, Fig. 2, the method improving goaf gas extraction concentration and flow in coal mining process of the present invention:
1, from 30 ~ 50m above coal seam (1) top board, and between return airway (2) and air intake lane (5) and distance return airway 20 ~ 40m place, along work surface (3) mining direction excavation suction road (4)；
2, in work surface (3) exploitation process, air intake lane (5) lay the gas injecting pipe (6) that diameter is 30～50cm, gas injecting pipe (6) gas outlet is positioned at the oxidized zone (8) of goaf (7), and from heat-radiation belt (10) 10 ~ 20m, and it is positioned at top, goaf (7) something lost coal (9) 0.3 ~ 0.6m；
3, slip casting baffle plate (12) is set at support (11) rear of work surface (3)；
4, placing grouting pump (13) in return airway (2), grouting pump (13) outlet is connected to the first valve (14)；
5, lay, along return airway (2) and work surface (3), the Grouting Pipe (15) that diameter is 30～45cm, and Grouting Pipe (15) entrance is connected with grouting pump (13)；
6, Grouting Pipe (15) is disposed therethrough the filling pipe (16) of slip casting baffle plate (12) along work surface (3) every 30 ~ 50m；
7, open the first valve (14), start filling support (11) rear hole area, and form the backfilled enclosed wall (17) of 2 ~ 5m, it is prevented that inject the CO in goaf (7)2Leak to work surface (3)；
8, the first valve (14) is closed, the gas injecting pipe (6) CO in the second valve (18) with air intake lane (5)2Air accumulator (19) connects；
9, open the first valve (14) to start to inject liquid CO to goaf (7) internal oxidition band (8)2；Inject liquid CO2After, it is possible to decrease oxidized zone (8) interior temperature and oxygen concentration, it is prevented that in goaf (7), lose coal (9) spontaneous combustion.Due to CO2Density more than CH4, and crush coal petrography in goaf (7) to CO2Adsorptivity higher, CH of broken coal petrography absorption originally in goaf (7)4Can by CO2Displace, and migrate to goaf (7) top, by suction road (4), the gas in goaf (7) is carried out extraction simultaneously.
Claims (1)
1. the method improving goaf gas extraction concentration and flow in coal mining process, it is characterised in that include the description below:
A, from 30 ~ 50m above coal seam (1) top board, and between return airway (2) and air intake lane (5) and distance return airway 20 ~ 40m place, along work surface (3) mining direction excavation suction road (4)；
In b, work surface (3) exploitation process, air intake lane (5) lay the gas injecting pipe (6) that diameter is 30～50cm, gas injecting pipe (6) gas outlet is positioned at the oxidized zone (8) of goaf (7), and from heat-radiation belt 10 ~ 20m, and it is positioned at top, goaf (7) something lost coal (9) 0.3 ~ 0.6m；
C, slip casting baffle plate (12) is set at support (11) rear of work surface (3)；Placing grouting pump (13) in return airway (2), grouting pump (13) outlet is connected to the first valve (14)；The Grouting Pipe (15) that diameter is 30～45cm is laid along return airway (2) and work surface (3), and Grouting Pipe (15) entrance is connected with grouting pump (13), Grouting Pipe (15) is disposed therethrough the filling pipe (16) of slip casting baffle plate (12) along work surface (3) every 30 ~ 50m；
D, open the first valve (14), start filling support (11) rear hole area, and form the backfilled enclosed wall (17) of 2 ~ 5m, close the first valve (14)；
E, gas injecting pipe (6) CO in the second valve (18) with air intake lane (5)2Air accumulator (19) connects；Open the first valve (14) and start to inject CO2, simultaneously by suction road (4) extraction goaf (7) interior gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510055365.9A CN104696007B (en) | 2015-02-03 | 2015-02-03 | A kind of method improving goaf gas extraction concentration and flow in coal mining process |
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| CN201510055365.9A CN104696007B (en) | 2015-02-03 | 2015-02-03 | A kind of method improving goaf gas extraction concentration and flow in coal mining process |
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| CN104696007A CN104696007A (en) | 2015-06-10 |
| CN104696007B true CN104696007B (en) | 2016-07-27 |
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Families Citing this family (2)
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| 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 |
| CN113931692B (en) * | 2021-11-01 | 2024-05-14 | 太原理工大学 | Quick sealing wall construction method for coal mine emergency rescue |
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| CN102345469A (en) * | 2010-08-05 | 2012-02-08 | 太原理工大学 | Test analog device for studying gas migration in mined-out area under different ventilation conditions |
| CN103046947A (en) * | 2011-10-14 | 2013-04-17 | 中国矿业大学(北京) | Gas extraction method by using major diameter pipeline and sealing transverses between mine goaf and tail roadway |
| CN103195390A (en) * | 2013-04-10 | 2013-07-10 | 山西潞安环保能源开发股份有限公司 | Mining-coal bed nearly horizontal gas extraction borehole sealing method |
| CN103670496A (en) * | 2013-12-12 | 2014-03-26 | 中国矿业大学 | Gob-side entry retaining and sectional coal seam gas pre-extracting method for single low-permeability outburst coal seam |
| CN103775122A (en) * | 2014-02-25 | 2014-05-07 | 中国矿业大学(北京) | Simulation experiment device of gas extraction and coal spontaneous combustion of spontaneous combustion-prone and high gas concentration coal seam goaf |
| CN104314608A (en) * | 2014-09-28 | 2015-01-28 | 太原理工大学 | Cooling and heating alternating system for improving coal-bed gas extraction amount |
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- 2015-02-03 CN CN201510055365.9A patent/CN104696007B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082283A (en) * | 2007-06-29 | 2007-12-05 | 淮南矿业(集团)有限责任公司 | Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method |
| EA013445B1 (en) * | 2008-07-14 | 2010-04-30 | Открытое Акционерное Общество "Белгорхимпром" (Оао "Белгорхимпром") | Coalfield underground mining and method therefor |
| CN102345469A (en) * | 2010-08-05 | 2012-02-08 | 太原理工大学 | Test analog device for studying gas migration in mined-out area under different ventilation conditions |
| CN103046947A (en) * | 2011-10-14 | 2013-04-17 | 中国矿业大学(北京) | Gas extraction method by using major diameter pipeline and sealing transverses between mine goaf and tail roadway |
| CN103195390A (en) * | 2013-04-10 | 2013-07-10 | 山西潞安环保能源开发股份有限公司 | Mining-coal bed nearly horizontal gas extraction borehole sealing method |
| CN103670496A (en) * | 2013-12-12 | 2014-03-26 | 中国矿业大学 | Gob-side entry retaining and sectional coal seam gas pre-extracting method for single low-permeability outburst coal seam |
| CN103775122A (en) * | 2014-02-25 | 2014-05-07 | 中国矿业大学(北京) | Simulation experiment device of gas extraction and coal spontaneous combustion of spontaneous combustion-prone and high gas concentration coal seam goaf |
| CN104314608A (en) * | 2014-09-28 | 2015-01-28 | 太原理工大学 | Cooling and heating alternating system for improving coal-bed gas extraction amount |
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