CN108952719A - Coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving - Google Patents
Coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 151
- 238000005065 mining Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000002309 gasification Methods 0.000 title claims abstract description 36
- 239000002360 explosive Substances 0.000 claims abstract description 15
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000013461 design Methods 0.000 claims abstract description 9
- 238000011049 filling Methods 0.000 claims description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 4
- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000002737 fuel gas Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
-
- 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
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- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
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Abstract
The invention discloses the methods that coal seam gasification second mining under the conditions of a kind of longwall top coal caving loses coal, comprising the following steps: isolation wall displacement delimited in step 1 design work face；In step 2 fully mechanized coal face exploitation process, working face is subjected to draining drainage, to the pre-buried explosive of coal column within the divider wall range of design, associated pipe is laid simultaneously in backfilling working face tunnel；Step 3 Mining Area track tunnel, haulage drift prevent fires it is closed, be arranged divider wall；External pipe, blower and exploiting field second mining system are connected；Step 4 igniting second mining.
Description
Technical field
It is specifically a kind of using under the conditions of coal seam gasification second mining longwall top coal caving the present invention relates to coal mining technology field
Lose the method for coal.
Background technique
In recent years, Coal Resource Development utilization efficiency is higher and higher, and the finiteness of resource is wanted with resource requirement unlimitedness
Seek the rate of extraction that must improve coal resources as far as possible.Loss coal is in many as caused by production technique and production practice
The coal mine of old mine and mining conditions difference forms dull reserves, these coal reserves have considerable economic benefits, and second mining is for mine
The sustainable development of well and the economic benefit for improving mine are of great significance.
Longwall Top Coal Caving Method is extensive in coal in China industrial application, high, high-efficient, the at low cost, lane with per unit area yield
Road driving amount is small, removal of home number is few, to Coal Seam Thickness Change and it is architectonic adaptable the advantages that, but also have simultaneously
The shortcomings that coal damages more, easy ignition, coal dust is big and gas easily gathers.The resource recovery rate of mining exploitation is generally 65%
~85%, the only a few rate of extraction is up to 90%, it is seen then that still has a large amount of coal resources to be lost in goaf, causes huge money
Source waste.Therefore, the existing mining of second mining improves resource recovery rate to the shaft production period is extended, and improves business efficiency
Deng all having important practical significance.
Less to the research of mining something lost coal at present, CN201410029095 discloses the comprehensive second mining of putting of one kind and remains
The method of ground coal, lower gangway is along outer wrong 1~2 span length driving of residual ground coal bottom plate mainly on second mining working face, rationally
Setting segment protection coal column cuts eye, Strengthening Roof, control coal seam, carries out comprehensive second mining of putting and remains ground coal；CN201710687657
It discloses a kind of second mining super high seam and stops the method for adopting line coal column, tunnel one on super high seam top and work along coal column second mining
The tunnel of face direction of propulsion is roadside packing tunnel, tunnels coal column second mining working face extraction tunnel and attached inclined gallery form it into
Complete production system arranges coal column second mining working face.
Above-mentioned existing mining loses coal second mining method mainly to leave coal column, corner coal or the biggish bottom of thickness
Based on the secondary recovery of coal, the method for second mining is also mainly to rearrange working face, based on special coal mining method.For
Mining loses the second mining of coal, because in existing disclosed document, also failing to obtain there are above-mentioned many technical problems
Obtain the report of related second mining method.
Summary of the invention
In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a kind of longwall top coal caving items
Coal seam gasification second mining loses the method for coal under part, to solve the problems mentioned in the above background technology.
The technical solution adopted by the present invention is as follows,
Coal seam gasification second mining loses the method for coal under the conditions of the first longwall top coal caving provided by the invention, is suitable for not
There is design second mining system in advance and lay second mining facility, but comprehensive method of putting has been used to exploit the working face finished, working face lane
Road cannot be overlapped the condition of arrangement with divider wall；This includes the following steps,
After step 1 fully-mechanized mining working is exploited, in conjunction with the original geologic information in exploiting field, technical data, the means of production,
Isolation wall displacement delimited in working face periphery；
Step 2 tunnels lower slicing roadway according to the isolation wall displacement of delimitation, and driving is simultaneously to answering within divider wall range
Large diameter borehole is crept into the domain of exploiting field lays air duct, backwind tube, drainpipe, sensor；For partial width >=30m coal
Column buries explosive using drilling drilling in the borehole, forms lower leaf divider wall using obturation filling lower slicing roadway；
Step 3 tunnels higher slice tunnel according to the isolation wall displacement of delimitation, is formed using obturation filling higher slice tunnel
Higher slice divider wall；
Step 4 prevent fires to second mining region inner working face tunnel closed；By external air duct, backwind tube, drainpipe,
Sensor is connect with the air duct in the second mining system of exploiting field, backwind tube, drainpipe；
Step 5 igniting second mining, feeds back to control system according to the monitoring data of sensor, control system adjusts in due course to be contained
The parameters such as temperature, air-steam content, oxygen concentration, air pressure guarantee that coal seam gasification is normally carried out.
The present invention also provides the methods that coal seam gasification second mining under the conditions of another longwall top coal caving loses coal, are applicable in
Thicker in coal seam, when longwall top coal caving, has laid the second minings such as second mining air inlet pipe, backwind tube, drainpipe, explosive and sensor in advance and has set
The condition applied；The following steps are included:
Step 1 combines exploiting field geology data, technical data, designs fully mechanized coal face, delimits isolation wall displacement；
Before step 2 fully mechanized coal face back production, to working face open-off cut using obturation filling open-off cut formed lower leaf every
From wall；
In step 3 fully mechanized coal face exploitation process, with the advance of the face, tunnel edge lay air duct, backwind tube,
Drainpipe and sensor, while the embedded explosive that drills is utilized for partial width >=30m coal column；The left and right side in second mining region
The tunnel on boundary lags stowboard with the advance of the face, forms lower leaf divider wall；
Divider wall lane higher slice tunnel is tunneled after step 4 fully mechanized coal face complete extraction, is filled using obturation
Slice drift forms higher slice divider wall；
Step 5 prevent fires to Mining Area tunnel closed；By external air duct, backwind tube, drainpipe, sensor
It is connect with exploiting field second mining system；
Step 6 igniting second mining, feeds back to control system according to the monitoring data of sensor, control system adjusts in due course to be contained
The parameters such as temperature, air-steam content, oxygen concentration, air pressure guarantee that coal seam gasification is normally carried out.
Further, in above-mentioned two technical solution, relevant parameter described in step 4, including temperature, air water steam
Vapour content, oxygen concentration, air pressure.
Further, in above-mentioned two technical solution, the lower leaf divider wall is tunneled by the way of planted agent, described
Higher slice divider wall is tunneled using the mode of caunching, and guarantees that coal body is not in contact with working face something lost coal on the outside of divider wall.
Further, in above-mentioned two technical solution, its material of the obturation of the divider wall, which can be used, has certain branch
Support the material, such as concrete material, high-water material etc. of intensity and flame retardant property.
Further, in above-mentioned two technical solution, the explosive makes coal seam of gasifying using the energy that explosive charge generates
The condition of seepage flow burning is created in loose, fragmentation.
Compared with prior art, the beneficial effects of the present invention are:
The utilization rate of coal resources and the economic benefit of coal production has can be improved in the technology, will be that coal industry is new
Point of economic increase；Coal underground gasification technology can reduce the pollution that coal resource utilizes process to generate environment, be one and meet
The Green Mining Technology of the strategy of sustainable development, improves work efficiency, and is suitble to large-scale promotion.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, the application's
Illustrative embodiments and their description are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the vertical structure sectional drawing in the embodiment of the present invention 1；
Fig. 2 is the transverse structure schematic diagram in the embodiment of the present invention 1；
Fig. 3 is the vertical structure sectional drawing in the embodiment of the present invention 2；
Fig. 4 is the transverse structure schematic diagram in the embodiment of the present invention 2；
Fig. 5 is the generation structural schematic diagram of fuel gas in Underground Coal Gasification Process of the present invention；
In figure: 1, coal body, 2, divider wall, 21, higher slice divider wall, 22, lower leaf divider wall 23, dislocation filling isolation
Wall, 31, lower slicing roadway 32, higher slice tunnel 4, air inlet pipe, 5, working face something lost coal, 6, tunnel top coal body, 7, coal column, 8,
Roadway workface, 9, backwind tube, 10, explosive, 11, drainpipe, 12, combustion zone, 13, gasification after residue, 14, exploiting field gas collecting tube,
15, for air pump, 16, exploiting field air duct, 17, exploiting field integrate draining pipe, 18, draining pump, 19, collection air pump, 20, sensor, 201,
Temperature sensor, 202, humidity sensor, 203, oxygen concentration sensor, 204, baroceptor, 21, open-off cut.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless
Otherwise indicated, all technical and scientific terms used herein has and the application person of an ordinary skill in the technical field
Normally understood identical meanings.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular shape
Formula be also intended to include plural form, additionally, it should be understood that, when in the present specification use term "comprising" and/or
When " comprising ", existing characteristics, step, operation, device, component and/or their combination are indicated；
Underground coal gasification(UCG), which refers to the process of, in the present invention directly obtains fuel gas in ocurrence of coal seam place, i.e., on ground
It is lower that solid fossil is become into fuel gas by thermochemical process, ground is then discharged to by drilling, supplies user.Coal underground
Gasification is to be changed into low molecular combustion gas in underground combustion, be delivered directly to ground the macromolecule coal based on carbon elements
Chemical coal-mining method.The generation of fuel gas in Underground Coal Gasification Process is realized in three reaction zones in gasification tunnel
, i.e. zoneofoxidation, reducing zone and dry distillation zone, as shown in Figure 5.
After these three reaction zones, being formed containing combustible gas components is mainly CO, CH4、 H2Coal gas.Underground
Coal gas is clear energy sources and industrial chemicals, can be used for generating electricity, industrial combustion, city are civilian and the also Primordial Qi of metallurgical industry,
It can be with synthetic gasoline etc.；The present invention carries out second mining to coal is lost using the principle, that is, what is exploited is the working face something lost in figure
Coal 5 and coal column 7, specific combustion zone is as shown in the combustion zone 12 in figure；What Fig. 1 and Fig. 3 was indicated is successively to burn from left to right
Implementation figure；The residue 13 after being acquired complete gasification that grey parts indicate in figure, the remaining work not acquire
Lose coal 5 in face.
Embodiment 1
As shown in Figure 1 and Figure 2, it is suitable for without design second mining system in advance and lays second mining facility, but has used comprehensive
It puts method and exploits the working face finished, roadway workface cannot be overlapped the condition of arrangement with divider wall.The following steps are included:
After step 1 fully-mechanized mining working is exploited, in conjunction with the original geologic information in exploiting field, technical data, the means of production,
Isolation wall displacement delimited in working face periphery；
Step 2 tunnels lower slicing roadway according to the isolation wall displacement of delimitation, and driving is simultaneously to answering within divider wall range
Large diameter borehole is crept into the domain of exploiting field and lays air duct, backwind tube, drainpipe, sensor etc., for partial width >=30m
Coal column buries explosive using drilling drilling in the borehole, forms lower leaf divider wall using obturation filling lower slicing roadway；
Step 3 tunnels higher slice tunnel according to the isolation wall displacement of delimitation, is formed using obturation filling higher slice tunnel
Higher slice divider wall；
Step 4 prevent fires to second mining region inner working face tunnel closed；By external air duct, backwind tube, drainpipe,
Sensor is connect with the air duct in the second mining system of exploiting field, backwind tube, drainpipe；
Step 5 igniting second mining, feeds back to control system according to the monitoring data of sensor, control system adjusts in due course to be contained
The parameters such as temperature, air-steam content, oxygen concentration, air pressure guarantee that coal seam gasification is normally carried out.
After fully mechanized coal face exploitation, in conjunction with exploiting field geology data, technical data, the means of production, in Mining Area
Periphery is by tunneling out tunnel, and then grouting filling tunnel forms divider wall 2 as shown in Figure 2.
Fully mechanized mining coal body thickness is thicker, can layered driving tunnel according to the actual situation, lower slicing roadway 31 is first dug, under filling
Slice drift 31 forms lower leaf divider wall 22；Higher slice tunnel 32 is tunneled afterwards, fills higher slice tunnel 32, forms higher slice
Divider wall 21.
In digging laneway, when being more than 30m for 7 width of coal column, to improve gasification result, filled using divider wall 2
The tunnel of preceding driving is crept into using drilling, buries explosive 10 in the borehole.In divider wall tunneling construction simultaneously to goaf
Construction large diameter borehole lays the equipment such as air inlet pipe 4, backwind tube 9, drainpipe 11, sensor 20, has preferentially adopted work
Face Abandoned Tunnel reduces borehole engineering amount.
Drainage water in gob area is drained in time after laying drainpipe 11.
The lower leaf divider wall 22 is tunneled by the way of planted agent, and the higher slice divider wall 21 is using mode of caunching
Driving guarantees that coal body 1 is not in contact with working face something lost coal 5 on the outside of divider wall.
Igniting, concentration, water vapour content, the temperature, air pressure of the oxygen in air inlet pipeline are adjusted according to detection data in due course
Etc. indexs start coal seam gasification.
The divider wall 2 is made of higher slice divider wall 21 and lower leaf divider wall 22.
Embodiment 2
Such as Fig. 3, as shown in figure 4, being suitable for that coal seam is thicker, and when longwall top coal caving has laid second mining air inlet pipe 4, return air in advance
The condition of the second minings facilities such as pipe 9, drainpipe 11, explosive 10 and sensor 20.The following steps are included:
Step 1 combines exploiting field geology data, technical data, designs fully mechanized coal face, delimits isolation wall displacement；
Before step 2 fully mechanized coal face back production, to working face open-off cut using obturation filling open-off cut formed lower leaf every
From wall；
In step 3 fully mechanized coal face exploitation process, with the advance of the face, tunnel edge lay air duct, backwind tube,
Drainpipe, sensor etc., while the embedded explosive that drills is utilized for partial width >=30m coal column；The left and right side in second mining region
The tunnel on boundary lags stowboard with the advance of the face, forms lower leaf divider wall；
Divider wall lane higher slice tunnel is tunneled after step 4 fully mechanized coal face complete extraction, is filled using obturation
Slice drift forms higher slice divider wall；
Step 5 prevent fires to Mining Area tunnel closed；By external air duct, backwind tube, drainpipe, sensor
It is connect with exploiting field second mining system；
Step 6 igniting second mining, feeds back to control system according to the monitoring data of sensor, control system adjusts in due course to be contained
The parameters such as temperature, air-steam content, oxygen concentration, air pressure guarantee that coal seam gasification is normally carried out.
According to the original geologic information in exploiting field, technical data, the means of production, second mining design is combined with mining Design, work
Make face boundary tunnel and be overlapped arrangement with divider wall 2, then grouting filling tunnel forms divider wall 2 as shown in Fig. 4.
It will make after the filling of second mining region inner boundary roadway workface as lower leaf divider wall 22 during working face extraction
With, it is timely to drain drainage working face ponding in fully mechanized coal face exploitation process, when being more than 30m for 7 width of coal column, to improve
Gasification result utilizes the embedded explosive 10 that drills in tunnel 8.Follow closely fully mechanized coal face promote in tunnel 8 be laid with air inlet pipe 4,
Backwind tube 9, drainpipe 11 and sensor 20.
After Full-mechanized Mining Face exploitation, higher slice tunnel 32 is tunneled on 22 top of lower leaf divider wall, because upper
Goaf is closed on the inside of slice drift 32, to guarantee that safety avoids rock sky digging laneway, needs outer wrong 0.5~0.8 tunnel wide
Degree, higher slice tunnel 32 form dislocation filling divider wall 23 after filling.
Full-mechanized Mining Face tunnel 8 prevent fires closed.
The lower leaf divider wall 22 is tunneled by the way of planted agent, and the dislocation filling divider wall 23 uses the side of caunching
Formula driving guarantees that coal body 1 is not in contact with working face something lost coal 5 on the outside of divider wall.
Igniting, concentration, water vapour content, the temperature, air pressure of the oxygen in air inlet pipeline are adjusted according to detection data in due course
Etc. indexs start coal seam gasification.
The divider wall 2 is made of lower leaf divider wall 22 and dislocation filling divider wall 23.
In above-mentioned two embodiment, in which:
Air inlet pipe 4 that divider wall 2 is drawn after filling is sequentially connected for air pump 15, exploiting field air duct 16 from inside to outside；It returns
Air hose 9, collection air pump 19, exploiting field gas collecting tube 14 are sequentially connected from inside to outside；Drainpipe 11, draining pump 18, exploiting field integrate draining pipe by
It is sequentially connected from inside to outside；The sensors 20 of various monitoring combustion parameters can be with backwind tube 9 or air inlet pipe 4 or drainpipe 11 simultaneously
Laying.
The filler of the divider wall 2 should have certain support strength and flame retardant property, such as concrete, Gao Shui
Obturation etc.；
The inbuilt explosive 10 has ignition leads, controls explosion, break up coal using the coal body ignition leads of burning
Layer.
The air inlet pipe 4 is sequentially connected from inside to outside for air pump 15, exploiting field air duct 16, and effect is into coal seam
It is sent into the oxygen needed or oxygen and other combustion-supporting gases；
The drainpipe 11, draining pump 18, exploiting field integrate draining pipe are sequentially connected from inside to outside, and effect is to arrange
The ponding in goaf out；
The backwind tube 9, collection air pump 19, exploiting field gas collecting tube 14 are sequentially connected from inside to outside, and effect is will be in coal seam
What is generated contains CO, CH4、H2Fuel gas be collected.
The sensor 20 is by temperature sensor 201, humidity sensor 202, oxygen concentration sensor 203, air pressure sensing
Device 204 forms, and monitors temperature, air-steam content, oxygen concentration, pneumatic parameter in second mining region respectively, and monitoring parameters are anti-
Control system of feeding adjusts in due course guarantees that coal seam gasification is normal containing parameters such as temperature, air-steam content, oxygen concentration, air pressures
It carries out.
The conditional selection of sensor 20 is laid with air inlet pipe 4, backwind tube 9, drainpipe 11.
The divider wall 2 can be drawn a circle to approve according to the practical geological conditions of working face, preferentially use fault boundary rock mass do as every
From wall 2, grouting filling project amount is reduced.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any
Modification, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving, which comprises the following steps:
After step 1 fully-mechanized mining working is exploited, in conjunction with the original geologic information in exploiting field, technical data, the means of production, in working face
Isolation wall displacement delimited in periphery；
Step 2 tunnels lower slicing roadway according to the isolation wall displacement of delimitation, and driving is simultaneously to the second mining area within divider wall range
Large diameter borehole is crept into domain lays air duct, backwind tube, drainpipe and sensor；Lower slicing roadway shape is filled using obturation
At lower leaf divider wall；
Step 3 tunnels higher slice tunnel according to the isolation wall displacement of delimitation, is formed and is divided using obturation filling higher slice tunnel
Layer divider wall；
Step 4 prevent fires to second mining region inner working face tunnel closed；By external air duct, backwind tube, drainpipe, sensor
It is connect with the air duct in the second mining system of exploiting field, backwind tube, drainpipe；
Step 5 igniting second mining feeds back to control system according to the monitoring data of sensor, and control system adjusts related ginseng in due course
Number, guarantees that coal seam gasification is normally carried out.
2. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving as described in claim 1, feature exists
In, in step 2 for partial width >=30m coal column using drilling drilling, in the borehole bury explosive.
3. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving as described in claim 1, feature exists
In the relevant parameter includes temperature, air-steam content, oxygen concentration, pneumatic parameter.
4. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving as described in claim 1, feature exists
In the material with certain support strength and flame retardant property can be used in its material of the obturation of the divider wall.
5. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving as described in claim 1, feature exists
Tunneled by the way of planted agent in, the lower leaf divider wall, the higher slice divider wall is tunneled using the mode of caunching, guarantee every
Coal is lost with working face from coal body on the outside of wall not to be in contact.
6. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving, which comprises the following steps:
Step 1 combines exploiting field geology data, technical data, designs fully mechanized coal face, delimits isolation wall displacement；
Before step 2 fully mechanized coal face back production, lower leaf divider wall is formed using obturation filling open-off cut to working face open-off cut；
In step 3 fully mechanized coal face exploitation process, with the advance of the face, air duct, backwind tube, drainpipe are laid at tunnel edge
And sensor；The tunnel of the right boundary in second mining region lags stowboard with the advance of the face, forms lower leaf divider wall；
Divider wall lane higher slice tunnel is tunneled after step 4 fully mechanized coal face complete extraction, fills higher slice using obturation
Tunnel forms higher slice divider wall；
Step 5 prevent fires to Mining Area tunnel closed；By external air duct, backwind tube, drainpipe, sensor and exploiting field
The connection of second mining system；
Step 6 igniting second mining, feeds back to control system according to the monitoring data of sensor, control system adjusts relevant parameter in due course
Guarantee that coal seam gasification is normally carried out.
7. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving as claimed in claim 6, feature exists
In, in step 2 for partial width >=30m coal column using drilling drilling, in the borehole bury explosive.
8. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving as claimed in claim 6, feature exists
In the relevant parameter includes temperature, air-steam content, oxygen concentration, pneumatic parameter.
9. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving as claimed in claim 6, feature exists
In the material with certain support strength and flame retardant property can be used in its material of the obturation of the divider wall.
10. coal seam gasification second mining loses the method for coal under the conditions of a kind of longwall top coal caving as claimed in claim 6, feature exists
Tunneled by the way of planted agent in, the lower leaf divider wall, the higher slice divider wall is tunneled using the mode of caunching, guarantee every
Coal is lost with working face from coal body on the outside of wall not to be in contact.
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