CN111577281A - High-gas coal seam coal pillar-free mining and gas control method - Google Patents
High-gas coal seam coal pillar-free mining and gas control method Download PDFInfo
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- CN111577281A CN111577281A CN202010439584.8A CN202010439584A CN111577281A CN 111577281 A CN111577281 A CN 111577281A CN 202010439584 A CN202010439584 A CN 202010439584A CN 111577281 A CN111577281 A CN 111577281A
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- 239000003245 coal Substances 0.000 title claims abstract description 86
- 238000005065 mining Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000009423 ventilation Methods 0.000 claims abstract description 34
- 238000009825 accumulation Methods 0.000 claims abstract description 8
- 210000000887 face Anatomy 0.000 claims description 19
- 238000005086 pumping Methods 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 11
- 238000009412 basement excavation Methods 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 52
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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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
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- 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
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- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a method for high-gas coal seam non-pillar mining and gas control, which is suitable for being used under a coal mine. Firstly, excavating mining roadways on two sides of a working face A and a transportation roadway of a working face B, excavating bedding drill holes on the side of the roadway during excavating to pre-pump coal seam gas, and continuously excavating and penetrating the excavating cutting holes of the two working faces; at the moment, the working face A belongs to a Y + L-shaped ventilation system, the ventilation quantity of the working face is larger, the gas at the upper corner can be diluted and discharged, and the problem of gas accumulation at the upper corner is solved. The air inlet lane of the working face A is reserved in a gob-side entry retaining mode during mining of the working face A, the air return lane of the working face B is arranged in an approach mining lane, the working face B is used for mining after mining of the working face A, the W-shaped fully-mechanized caving face is sequentially used for replacing the Y + L-shaped fully-mechanized caving face, and the roadway protection coal pillar between the two working faces is recovered in a belt mining mode during mining of the working face B, so that coal pillar-free mining is realized, the mining rate of a mine is effectively improved, and the problem of upper corner gas control in a high-gas working face is solved.
Description
Technical Field
The invention relates to a method for pillar-free mining and gas control of a high-gas coal seam, belonging to the technical field of coal mining.
Background
The coal resource reserves in the Luan mining area are rich, the 3# coal seam is mainly mined at present, the average thickness of the coal seam is 5-7 m, lean coal and lean coal are mainly used, and the gas content of the coal seam is 10.13-26.01 m3Per t, permeability generally less than 0.5 × 10-15m2Belongs to a thick coal seam with low permeability and high gas. At present, a 3# coal seam is mined by mainly adopting a fully mechanized top coal caving process, but the following problems are faced: (1) the absolute gas emission amount of the coal seam during the roadway driving is larger, the influence of a single-head roadway ventilation mode is realized, and the tunneling speed is slower; (2) the working face has high yield, high propelling speed, high mining strength and continuous tension of the working face; (3) roadway protection coal pillars with the width of 30-50 m are generally reserved between adjacent working faces, the mining rate of the working faces is reduced, and high-quality coal resources are seriously wasted; (4) in order to solve the problem that the gas at the upper corner is easy to exceed the limit, the air supply quantity of a working face is generally increased, so that the concentration of ventilation air methane of a mine is low, the ventilation air methane cannot be effectively utilized, and the emission of greenhouse gas is increased.
Disclosure of Invention
The invention aims to solve the problem of high gas coal seam mining and provides a method for high gas coal seam non-pillar mining and gas control, which has simple steps and good mining effect.
In order to achieve the purpose, the method for high-gas coal seam non-pillar mining and gas treatment comprises the following specific steps:
firstly, excavating coal roadways serving as transportation roadways, coal roadways serving as air inlet roadways and rock roadways serving as high-suction roadways in a roof on two sides of a working face A, synchronously excavating coal roadways serving as transportation roadways of a working face B, during excavation of each coal roadway, drilling bedding holes in the coal bodies to be mined from the roadway side part by using a drilling machine on the following excavation working face, and pre-pumping gas in the un-excavated coal bodies of the two working faces through the bedding holes to reduce the gas content of the mined coal bed;
b, after the arrangement of the roadways is finished, continuously excavating the cutting holes of the working face A and the working face B, and arranging a connecting roadway to communicate the cutting holes of the two working faces; after the two working faces cut the eyes and the arrangement of the communication lane is completed, the working face A is provided with a two-in one-back ventilation system: the transport lane and the air intake lane of the working face A are both used as air intake lanes, the transport lane of the working face B is used as an air return lane, and the mining can be started after the arrangement of the related fully mechanized mining equipment of the working face A is finished; and during the stoping period, the transportation lane of the working face A is abandoned along with the stoping, the air inlet lane is reserved in a gob-side entry retaining mode, and the top plate high-level pumping lane performs high-level pumping and discharging on the gas of the working face A. At the moment, the working face A transportation lane-the working face A air inlet lane form a Y-shaped ventilation system, the working face B hole cutting-the working face B transportation lane form an L-shaped air return system, so that the working face A is a Y + L-shaped ventilation system at the moment, the stoping lanes on two sides of the working face A are air inlet lanes at the moment, the ventilation volume is large, gas at the upper corner is diluted and discharged, and the problem of gas accumulation at the upper corner is solved;
c, during the mining of the working face A, arranging the working face B as a coal roadway of a return airway in a manner of heading towards the mining and excavating lane, and also arranging gas in a bedding drilling pre-extraction working face B pre-extraction coal body at the side part of the coal roadway during the excavating lane, and excavating a rock roadway serving as a high-extraction lane in a working face B top plate during the excavating period of the working face B return airway in order to ensure the surrounding rock stability of the working face B return airway and the working face A air inlet airway;
d, after excavation of the roadway is finished, mining equipment required by the working face B can be arranged, the working face A can immediately replace the working face B after recovery of the working face A is finished, the replacement time of the adjacent working face is greatly shortened, during the recovery period of the working face B, the air inlet roadway of the working face A reserved in a gob-side entry retaining mode is used as the air inlet roadway of the working face B, the transportation roadway of the working face B is used as the other air inlet roadway, the air return roadway of the working face B is used as the air return roadway, the ventilation system of the working face B belongs to partial W-shaped two-inlet one-return ventilation, and the problem of gas accumulation at the corner angle on the working face B is solved because the recovery roadways on the two sides of the working face B are both air inlet roadways at the moment;
and (e) recovering the roadway-protecting coal pillars in a belt mining mode during the stoping period of the working face B, really realizing the non-pillar mining between two adjacent high-gas working faces, improving the mining rate of the working faces and avoiding the waste of coal resources.
And recovering the lane protecting coal pillar with the width of 70m between the return airway of the working face B and the air inlet airway of the working face A in a belt mining mode during the stoping period of the working face B. During mining roadway serving as a transport roadway and an air inlet roadway on two sides of a digging working face A and transport roadway and air return roadway of a working face B, bedding drill holes are respectively arranged in the roadways, and gas accumulated in coal layers of the working face A and the working face B is pre-pumped; gas high-position drainage is respectively carried out through high drainage tunnels of the top plates of the working face A and the working face B, so that the gas concentration in the working face stoping process is reduced; and (3) transporting the coal bed gas extracted through the bedding drilling and the high-level pumping roadway to a ground oxidation power station through a pipeline, and carrying out oxidation power generation after mixing with ventilation air discharged from the air return vertical shaft.
Has the advantages that:
arranging a stoping roadway adjacent to the fully-mechanized caving face in advance in a manner of heading to the mining roadway to ensure quick replacement of the adjacent fully-mechanized caving face; the roadway protection coal pillars between adjacent high-gas fully mechanized caving faces are recovered in a belt mining mode, so that non-pillar mining is realized, the mining rate of a working face is improved, and high-quality coal resources are prevented from being wasted; the method comprises the steps of 'ventilation in two-inlet and one-return, drilling hole pre-pumping and mining while pumping', gas in a coal layer to be mined is pre-pumped through reasonable roadway arrangement, the gas pre-pumping time is longer and the gas pumping effect is better for a working face to be replaced, meanwhile, two-inlet and one-return ventilation systems are constructed in two adjacent high gas fully mechanized faces, the problem of gas accumulation at the upper corner is effectively solved by increasing the ventilation amount of the working face, and the safe and efficient mining of a mine is ensured; the ventilation air methane and the extracted gas in the air return well are mixed and then oxidized to generate electricity, so that the low-concentration gas in the ventilation air methane is effectively utilized, the gas discharge amount of a mine is reduced, and the green mining of a high-gas coal bed is realized.
And excavating a return airway of the working face B in a mode of facing to an excavating airway during the stoping period of the working face A, and reserving coal pillars for ensuring the stability of the two airways. During stoping of the working face B, the roadway is arranged in a W-shaped mode, the reserved coal pillars are located inside the working face, and the coal pillars can be directly recovered during stoping of the working face, so that coal pillar-free mining is realized. The method has the advantages that the method for quickly filling the goaf is not utilized to recover the roadway-protecting coal pillars, and a supporting structure is not additionally established.
Drawings
FIG. 1 is a schematic flow chart of the method for pillar-free mining and gas control of the high-gas coal seam according to the invention;
FIG. 2 is a schematic diagram of a mining roadway, a high suction roadway and a working face B transportation roadway which are used as a transportation roadway and an air inlet roadway on two sides of a digging working face A and are provided with bedding drill holes;
FIG. 3 is a schematic illustration of the cutting and communication lanes of the invention for the excavation face A and face B;
FIG. 4 is a schematic view of the ventilation system during recovery of working face A of the present invention;
FIG. 5 is a schematic view of the ventilation system during recovery of working face B of the present invention;
FIG. 6 is a schematic diagram of a working face B with mining roadway-protecting coal pillar to achieve pillar-free mining.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 5, the method for high-gas coal seam non-pillar mining and gas treatment is characterized by comprising the following specific steps:
firstly, excavating coal roadways serving as transportation roadways, coal roadways serving as air inlet roadways and rock roadways serving as high-suction roadways in a roof on two sides of a working face A, synchronously excavating coal roadways serving as transportation roadways of a working face B, during excavation of each coal roadway, drilling bedding holes in the coal bodies to be mined from the roadway side part by using a drilling machine on the following excavation working face, and pre-pumping gas in the un-excavated coal bodies of the two working faces through the bedding holes to reduce the gas content of the mined coal bed;
b, after the arrangement of the roadways is finished, continuously excavating the cutting holes of the working face A and the working face B, and arranging a connecting roadway to communicate the cutting holes of the two working faces; after the two working faces cut the eyes and the arrangement of the communication lane is completed, the working face A is provided with a two-in one-back ventilation system: the transport lane and the air intake lane of the working face A are both used as air intake lanes, the transport lane of the working face B is used as an air return lane, and the mining can be started after the arrangement of the related fully mechanized mining equipment of the working face A is finished; and during the stoping period, the transportation lane of the working face A is abandoned along with the stoping, the air inlet lane is reserved in a gob-side entry retaining mode, and the top plate high-level pumping lane performs high-level pumping and discharging on the gas of the working face A. At the moment, the working face A transportation lane-the working face A air inlet lane form a Y-shaped ventilation system, the working face B hole cutting-the working face B transportation lane form an L-shaped air return system, so that the working face A is a Y + L-shaped ventilation system at the moment, the stoping lanes on two sides of the working face A are air inlet lanes at the moment, the ventilation volume is large, gas at the upper corner is diluted and discharged, and the problem of gas accumulation at the upper corner is solved;
c, during the mining of the working face A, arranging the working face B as a coal roadway of a return airway in a manner of heading towards the mining and excavating lane, and also arranging gas in a bedding drilling pre-extraction working face B pre-extraction coal body at the side part of the coal roadway during the excavating lane, and excavating a rock roadway serving as a high-extraction lane in a working face B top plate during the excavating period of the working face B return airway in order to ensure the surrounding rock stability of the working face B return airway and the working face A air inlet airway;
d, after excavation of the roadway is finished, mining equipment required by the working face B can be arranged, the working face A can immediately replace the working face B after recovery of the working face A is finished, the replacement time of the adjacent working face is greatly shortened, during the recovery period of the working face B, the air inlet roadway of the working face A reserved in a gob-side entry retaining mode is used as the air inlet roadway of the working face B, the transportation roadway of the working face B is used as the other air inlet roadway, the air return roadway of the working face B is used as the air return roadway, the ventilation system of the working face B belongs to partial W-shaped two-inlet one-return ventilation, and the problem of gas accumulation at the corner angle on the working face B is solved because the recovery roadways on the two sides of the working face B are both air inlet roadways at the moment;
and (e) recovering the roadway-protecting coal pillars in a belt mining mode during the stoping period of the working face B, really realizing the non-pillar mining between two adjacent high-gas working faces, improving the mining rate of the working faces and avoiding the waste of coal resources. And recovering the tunnel-protecting coal pillar with the width of 70m between the return airway of the working face B and the air inlet airway of the working face A in a belt mining mode during the stoping period of the working face B.
During mining roadway serving as a transport roadway and an air inlet roadway on two sides of a digging working face A and transport roadway and air return roadway of a working face B, bedding drill holes are respectively arranged in the roadways, and gas accumulated in coal layers of the working face A and the working face B is pre-pumped; gas high-position drainage is respectively carried out through high drainage tunnels of the top plates of the working face A and the working face B, so that the gas concentration in the working face stoping process is reduced; and (3) transporting the coal bed gas extracted through bedding drilling and high-level pumping to a ground oxidation power station through a pipeline, and carrying out oxidation power generation after mixing with ventilation air methane discharged from a return air vertical shaft, so as to realize the efficient utilization of low-concentration gas in the ventilation air methane.
Claims (3)
1. A method for high-gas coal seam non-pillar mining and gas treatment is characterized by comprising the following specific steps:
firstly, excavating coal roadways serving as transportation roadways, coal roadways serving as air inlet roadways and rock roadways serving as high-suction roadways in a roof on two sides of a working face A, synchronously excavating coal roadways serving as transportation roadways of a working face B, during excavation of each coal roadway, drilling bedding holes in the coal bodies to be mined from the roadway side part by using a drilling machine on the following excavation working face, and pre-pumping gas in the un-excavated coal bodies of the two working faces through the bedding holes to reduce the gas content of the mined coal bed;
b, after the arrangement of the roadways is finished, continuously excavating the cutting holes of the working face A and the working face B, and arranging a connecting roadway to communicate the cutting holes of the two working faces; after the two working faces cut the eyes and the arrangement of the communication lane is completed, the working face A is provided with a two-in one-back ventilation system: the transport lane and the air intake lane of the working face A are both used as air intake lanes, the transport lane of the working face B is used as an air return lane, and the mining can be started after the arrangement of the related fully mechanized mining equipment of the working face A is finished; during the stoping period, the transport lane of the working face A is abandoned along with the mining, the air inlet lane is reserved in a way of retaining a lane along the sky, the gas of the working face A is subjected to high-position drainage by the top plate high-drainage lane, the Y-shaped ventilation system is formed by the working face A transport lane, the working face A air inlet lane and the working face A air inlet lane, the L-shaped air return system is formed by the working face B cut hole and the working face B transport lane, the working face A is the Y + L-shaped ventilation system, the stoping lanes on two sides of the working face A are air inlet lanes, the ventilation volume is large, the gas at the upper corner is diluted and discharged, and the problem of gas accumulation at the upper corner is solved;
c, during the mining of the working face A, arranging the working face B as a coal roadway of a return airway in a manner of heading towards the mining and excavating lane, and also arranging gas in a bedding drilling pre-extraction working face B pre-extraction coal body at the side part of the coal roadway during the excavating lane, and excavating a rock roadway serving as a high-extraction lane in a working face B top plate during the excavating period of the working face B return airway in order to ensure the surrounding rock stability of the working face B return airway and the working face A air inlet airway;
d, after excavation of the roadway is finished, mining equipment required by the working face B can be arranged, the working face A can immediately replace the working face B after recovery of the working face A is finished, the replacement time of the adjacent working face is greatly shortened, during the recovery period of the working face B, the air inlet roadway of the working face A reserved in a gob-side entry retaining mode is used as the air inlet roadway of the working face B, the transportation roadway of the working face B is used as the other air inlet roadway, the air return roadway of the working face B is used as the air return roadway, the ventilation system of the working face B belongs to partial W-shaped two-inlet one-return ventilation, and the problem of gas accumulation at the corner angle on the working face B is solved because the recovery roadways on the two sides of the working face B are both air inlet roadways at the moment;
and (e) recovering the roadway-protecting coal pillars in a belt mining mode during the stoping period of the working face B, really realizing the non-pillar mining between two adjacent high-gas working faces, improving the mining rate of the working faces and avoiding the waste of coal resources.
2. The adjacent working face coal pillar-free mining is achieved according to claim 1, wherein: and recovering the lane protecting coal pillar with the width of 70m between the return airway of the working face B and the air inlet airway of the working face A in a belt mining mode during the stoping period of the working face B.
3. The efficient utilization of coal bed gas resources is realized according to claim 1, and the method is characterized in that: during mining roadway serving as a transport roadway and an air inlet roadway on two sides of a digging working face A and transport roadway and air return roadway of a working face B, bedding drill holes are respectively arranged in the roadways, and gas accumulated in coal layers of the working face A and the working face B is pre-pumped; gas high-position drainage is respectively carried out through high drainage tunnels of the top plates of the working face A and the working face B, so that the gas concentration in the working face stoping process is reduced; and (3) transporting the coal bed gas extracted through the bedding drilling and the high-level pumping roadway to a ground oxidation power station through a pipeline, and carrying out oxidation power generation after mixing with ventilation air discharged from the air return vertical shaft.
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Cited By (2)
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| CN113513359A (en) * | 2021-08-09 | 2021-10-19 | 太原理工大学 | Fully-mechanized coal mining coal seam high-position roadway one-roadway dual-purpose gas extraction method |
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