CN104696007A - Method for increasing gas extraction concentration and flow in goaf in coal mining process - Google Patents
Method for increasing gas extraction concentration and flow in goaf in coal mining process Download PDFInfo
- Publication number
- CN104696007A CN104696007A CN201510055365.9A CN201510055365A CN104696007A CN 104696007 A CN104696007 A CN 104696007A CN 201510055365 A CN201510055365 A CN 201510055365A CN 104696007 A CN104696007 A CN 104696007A
- Authority
- CN
- China
- Prior art keywords
- goaf
- gas
- pipe
- valve
- grouting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003245 coal Substances 0.000 title claims abstract description 26
- 238000000605 extraction Methods 0.000 title claims abstract description 20
- 238000005065 mining Methods 0.000 title claims abstract description 13
- 238000007569 slipcasting Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract 2
- 239000007924 injection Substances 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 2
- 238000012856 packing Methods 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 26
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000002269 spontaneous effect Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 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
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration 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
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method for increasing gas extraction concentration and flow in a goaf in a coal mining process. The method comprises the following the following steps: firstly, a high extraction lane is dug along the mining direction of a working surface; a gas injection pipeline is paved in an air inlet lane in the mining process of the working surface, wherein a gas outlet of the gas injection pipeline is arranged in an oxidization zone of the goaf and is higher than the residual coal in the goaf; a grouting baffle is arranged on the back of a bracket of the working surface, grouting pipes are paved along an air returning lane and the working surface, and packing pipes penetrating through the baffle are arranged in the grouting pipes along the working surface; a cavity area on the back of the bracket is packed to form a packed and sealed wall, thereby preventing CO2 injected into the goaf from leaking to the working surface; liquid CO2 is injected into the oxidization zone in the goaf along the pipeline in the air inlet lane and is used for replacing CH4. By virtue of the method, the extraction concentration and flow of CH4 are improved.
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 the most easily assembled, if do not take effective control measures, may 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, utilizes blower fan to operate and produces negative pressure, thus change eddy current situation near upper corner, discharged by high concentration gas near upper corner by pipeline ejectment to safety place.Suction road method is carry out supratidal pond to goaf gas merely equally.But because of goaf air leaking more, using pipe laying method and suction road method to draw out methane, concentration is low and flow is little, 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, be badly in need of seeking a kind ofly improving goaf gas extraction concentration and flow and the method for spontaneous combustion of remaining coal can being prevented.
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 invention provides a kind of method improving goaf gas extraction concentration and flow in coal mining process.
Technical scheme of the present invention: the method improving goaf gas extraction concentration and flow in coal mining process, concrete steps are as follows:
A, apart 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, excavates suction road (4) along work plane (3) mining direction;
In b, working face extraction process, in air intake lane, lay the gas injecting pipe that diameter is 30 ~ 50cm, gas injecting pipe gas outlet is positioned at the oxidized zone in goaf, and apart from heat-radiation belt 10 ~ 20m, and be 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 plane.In return airway, place grouting pump, grouting pump outlet is connected with the first valve.Laying diameter along return airway and work plane 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 every 30 ~ 50m along work plane;
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 gasholder in air intake lane through the second valve.Open the first valve to start to inject CO
2, by suction road, gas in goaf is carried out extraction simultaneously.
Beneficial effect of the present invention:
(1) gas injecting pipe outlet is positioned at the oxidized zone in goaf, and loses coal higher than in goaf, can avoid that pipe outlet is blocked, pipeline is by the phenomenon of damaging by pressure.
(2) filling is carried out to support rear hole area, form backfilled enclosed wall, the CO injected in goaf can be prevented
2leak to work plane, prevent from damaging human body.
(3) liquid CO is injected to goaf internal oxidition band
2, directly can reduce temperature and oxygen concentration in oxidized zone, prevent residual coal spontaneous combustion in goaf.
(4) because CO
2density be greater than CH
4, and in goaf broken coal petrography to CO
2adsorptivity stronger, can by the CH of coal petrography broken in goaf absorption originally
4displace, and drive to top, goaf, then carry out extraction through suction road, improve extraction concentration and flow.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention
Fig. 2 is A-A sectional drawing in Fig. 1
In figure: 1-coal seam, 2-return airway, 3-work plane, 4-suction road, 5-air intake lane,
6-gas injecting pipe, 7-goaf, 8-oxidized zone, 9-lose coal, 10-heat-radiation belt,
11-support, 12-slip casting baffle plate, 13-grouting pump, the 14-the first valve, 15-Grouting Pipe, 16-filling pipe, 17-backfilled enclosed wall, the 18-the second valve, 19-CO
2gasholder.
Detailed description of the invention
Below in conjunction with accompanying drawing, 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, at 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 plane (3) mining direction excavation suction road (4);
2, in work plane (3) exploitation process, the gas injecting pipe (6) that diameter is 30 ~ 50cm is laid in air intake lane (5), gas injecting pipe (6) gas outlet is positioned at the oxidized zone (8) of goaf (7), and apart from heat-radiation belt (10) 10 ~ 20m, and be 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 plane (3);
4, in return airway (2), place grouting pump (13), grouting pump (13) outlet is connected with the first valve (14);
5, lay along return airway (2) and work plane (3) Grouting Pipe (15) that diameter is 30 ~ 45cm, and Grouting Pipe (15) entrance is connected with grouting pump (3);
6, Grouting Pipe (15) is disposed therethrough the filling pipe (16) of slip casting baffle plate (12) every 30 ~ 50m along work plane (3);
7, open the first valve (14), start filling support (11) rear hole area, and form the backfilled enclosed wall (17) of 2 ~ 5m, prevent from injecting the CO in goaf (7)
2leak to work plane (3);
8, the first valve (14) is closed, the CO of gas injecting pipe (6) in the second valve (18) with air intake lane (5)
2gasholder (19) connects;
9, open the first valve (14) to start to inject liquid CO to goaf (7) internal oxidition band (8)
2; Inject liquid CO
2after, oxidized zone (8) interior temperature and oxygen concentration can be reduced, prevent from losing coal (9) spontaneous combustion in goaf (7).Due to CO
2density be greater than CH
4, and goaf (7) interior broken coal petrography is to CO
2adsorptivity stronger, the CH of broken coal petrography absorption originally in goaf (7)
4can by CO
2displace, and migration is to goaf (7) top, by suction road (4), extraction is carried out to the gas in goaf (7) simultaneously.
Claims (1)
1. in coal mining process, improve a method for goaf gas extraction concentration and flow, it is characterized in that comprising following content:
A, apart 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, excavates suction road (4) along work plane (3) mining direction;
In b, work plane (3) exploitation process, the gas injecting pipe (6) that diameter is 30 ~ 50cm is laid in air intake lane (5), gas injecting pipe (6) gas outlet is positioned at the oxidized zone (8) of goaf (7), and apart from heat-radiation belt 10 ~ 20m, and be 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 plane (3); In return airway (2), place grouting pump (13), grouting pump (13) outlet is connected with the first valve (14); The Grouting Pipe (15) that diameter is 30 ~ 45cm is laid along return airway (2) and work plane (3), and Grouting Pipe (15) entrance is connected with grouting pump (3), Grouting Pipe (15) is disposed therethrough the filling pipe (16) of slip casting baffle plate (12) every 30 ~ 50m along work plane (3);
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 (4);
E, gas injecting pipe (6) CO in the second valve (18) with air intake lane (5)
2gasholder (19) connects; Open the first valve (4) to start to inject CO
2, simultaneously by suction road (4) extraction goaf (7) interior gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104696007A true CN104696007A (en) | 2015-06-10 |
| CN104696007B CN104696007B (en) | 2016-07-27 |
Family
ID=53343507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510055365.9A Active CN104696007B (en) | 2015-02-03 | 2015-02-03 | A kind of method improving goaf gas extraction concentration and flow in coal mining process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104696007B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113931692A (en) * | 2021-11-01 | 2022-01-14 | 太原理工大学 | Construction method of rapid airtight wall for coal mine emergency rescue |
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 |
-
2015
- 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN113931692A (en) * | 2021-11-01 | 2022-01-14 | 太原理工大学 | Construction method of rapid airtight wall for coal mine emergency rescue |
| CN113931692B (en) * | 2021-11-01 | 2024-05-14 | 太原理工大学 | Quick sealing wall construction method for coal mine emergency rescue |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104696007B (en) | 2016-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102140901B (en) | High pressure resistant drilled hole sealing method | |
| CN102182499B (en) | Hydrofracturing-based method and equipment for diminishing dust and eliminating outburst of coal bed | |
| CN102094670B (en) | Method for replacing mine goaf gas with carbon dioxide | |
| CN104314606B (en) | Hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in a kind of boring | |
| CN104653161A (en) | Coal mine underground pulse hydraulic slot cutting-fracturing integral anti-reflection extraction device and method | |
| CN104514577A (en) | Method for efficiently treating spontaneous ignition of remaining coal in large area goaf of shallow-buried coal bed | |
| CN106703871A (en) | Method of using high-pressure water injection to prevent and treat gas coal dust | |
| CN104696005B (en) | The method of sequestration of carbon dioxide extraction residual coal bed gas is worked in coordination with in old dead zone, colliery | |
| CN105822341A (en) | Low permeability coal bed supercritical carbon dioxide anti-reflection system and method | |
| CN104695908A (en) | Method for surface well drilling extraction of residual coal bed methane in old mined-out area | |
| CN106337695A (en) | Comprehensive treatment method for spontaneous combustion of residual coal in goaf and transfinite gas at upper corner | |
| CN110792469A (en) | Inclined coal seam overlength stope face gas and coal spontaneous combustion cooperative treatment method | |
| CN204941505U (en) | Liquid carbon dioxide big gun is with proppant explosion permeability improvement device | |
| CN102913274B (en) | System for increasing yield of gas excavation borehole and method thereof | |
| CN103195470B (en) | Drilling construction Gas gathering-device | |
| CN104696007A (en) | Method for increasing gas extraction concentration and flow in goaf in coal mining process | |
| CN112412422A (en) | Freezing fracturing cooperated coal seam hydraulic cavitation permeability increasing and pumping promoting method | |
| CN204327172U (en) | Formula boring goaf extraction structure before and after high-rise position | |
| CN207363699U (en) | A kind of device for improving downdraft mode paste body filling mining methods Tight filling rate | |
| CN205677660U (en) | System that a kind of hypotonic coal seam supercritical carbon dioxide is anti-reflection | |
| CN203430570U (en) | Combined air sac following type rapid plugging device for upper/lower corner of highly gassy mine or coal and gas outburst mine | |
| CN205743985U (en) | Upper corner gas pumping and discharging device | |
| CN113756857B (en) | Fire prevention and extinguishment extraction method for efficiently extracting coal bed gas in multi-layer old goaf on ground | |
| CN104481452B (en) | A kind of frequency conversion pulsating inlet well method for sealing | |
| CN105738153A (en) | Air pressure type rock mass drilling fixed-depth water getting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |