Method for pumping out gas from mining coal layer roof

A coal seam roof and gas drainage technology, which is applied in the direction of gas discharge, mining equipment, earthwork drilling, etc., can solve the problems of poor air permeability of the original coal seam, reduce gas, and gas concentration exceeds the limit, and achieve obvious technical advantages and promotion and application prospects , Ensure safe production and protect the environment

Inactive Publication Date: 2004-09-29
HUAINAN MINING IND GRP +1
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Problems solved by technology

In order to reduce the amount of gas emission, the mining area adopts the pre-extraction method of low-slab through-layer drilling. 8 、C 13 The comprehensive emission method based on coal seam gas has achieved some results, but due to the B 8 、C 13 The coal seam is rich in gas and the original coal seam has poor gas permeability, so the mine gas drainage rate has not exceeded 15%; especially in layered mining C 13 When the coal seam is formed, about 70% of the gas that cannot be pumped is poured into the goaf of the first-layer mining face, causing the gas concentration in the upper corner of the working face and the return air flow of the working face to exceed the limit, which seriously threatens the safety of mine production. The coal mining face is produced intermittently or by reducing the daily footage, which affects the coal production of the working face

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  • Method for pumping out gas from mining coal layer roof
  • Method for pumping out gas from mining coal layer roof

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Embodiment Construction

[0012] The method of the present invention is on the roof of the mining coal seam, for the desorption gas collected in the "annular fissure circle" from the mining and pressure relief coal seam through the crack channel formed by the overlying strata in the goaf affected by mining, the gas is arranged in the "annular fissure circle" The "annular fissure circle" is located in the abscission fracture zone above the roof caving zone of the goaf near the return airway and the air inlet roadway in the coal mining face.

[0013] In specific implementation, since the coal mining face generally has a certain inclination and is ventilated upwards, the gas will rise and float when the gas and air coexist. The drainage roadway is located in the "annular fissure circle" of the inner roof of the upwind roadway on the side of the working face, and the gas is drained from the goaf or the decompression and desorption gas from the adjacent layer to solve the gas overrun problem in the upper cor...

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Abstract

The gas pumping out method during mining cliff features that during mining cliff, the desorbed gas from the mined and released coal layers to the 'annular crack circle' via crack channel formed through mining is pumped via the drilled holes or tunnel in the 'annular crack circle'. The 'annular crack circle' is located in the stratafugic crack band over the stoped out cliff inbreak band near return airway and intake airway in the coal mining face. The present invention solves the problem of overrunning gas in stoping working face to ensure safe production.

Description

Technical field: [0001] The invention relates to a method for safe production in coal mines, more specifically a method for draining gas. Background technique: [0002] In the Huainan mining area of ​​Anhui Province, the coal seams are deep, rich in gas, and poor in gas permeability. According to statistics, the gas emission in the goaf accounts for more than 60% of the gas emission in the working face. In order to reduce the amount of gas emission, the mining area adopts the pre-extraction method of low-slab through-layer drilling. 8 、C 13 The comprehensive emission method based on coal seam gas has achieved some results, but due to the B 8 、C 13 The coal seam is rich in gas and the original coal seam has poor gas permeability, so the mine gas drainage rate has not exceeded 15%; especially in layered mining C 13 When the coal seam is formed, about 70% of the gas that cannot be pumped is poured into the goaf of the first-layer mining face, causing the gas concentration ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00
Inventor 袁亮刘泽功章立清于尔海李平王楚光廖斌琛周德永金学玉叶发光
Owner HUAINAN MINING IND GRP
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