Method for pumping out gas from mining coal layer roof

A coal seam roof and gas drainage technology, which is applied in gas discharge, mining equipment, earthwork drilling and mining, etc., can solve the problems of poor gas permeability of the original coal seam, reduce gas, and gas concentration exceeding the limit, and achieve obvious technical advantages and promotion and application prospects , Ensure safe production and reduce pollution
CN100356036CInactive Publication Date: 2007-12-19HUAINAN MINING IND GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAINAN MINING IND GRP
Publication Date
2007-12-19
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Claims

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