Comprehensive treatment method for spontaneous combustion of residual coal in goaf and transfinite gas at upper corner

Abstract

The invention relates to a comprehensive treatment method for spontaneous combustion of residual coal in a goaf and transfinite gas at an upper corner. A comprehensive treatment pipeline system adopted by the comprehensive treatment method comprises a nitrogen injection pipeline and an extraction pipeline, the nitrogen injection pipeline which exists in the intake airway of a working face is uniformly provided with tee-joint nitrogen injection openings at intervals along the length direction, all the tee-joint nitrogen injection openings are provided with nitrogen injection steel tubes on which valves are arranged, and the nitrogen injection steel tubes are pre-buried in the goaf; and the extraction pipeline is paved in the goaf along the return airway direction of the working face, the extraction pipeline is uniformly provided with a certain number of tee joints at intervals along the length direction, extraction steel tubes are inserted in the tee joints, and all the extraction steel tubes are provided with extraction holes. According to the comprehensive treatment method, the design is reasonable, the expulsion of nitrogen and the extraction and negative pressure action of a slantwise buried pipe form a system capable of pushing and absorbing the gas at the goaf simultaneously, the gas at the goaf is beneficial to being pushed to move, and the transfinite gas and the spontaneous combustion due to residual coal oxidation in the goaf are prevented.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a comprehensive treatment method for the spontaneous combustion of leftover coal in goafs and overrunning of upper corner gas. Background technique [0002] With the development and upgrading of coal mining equipment and technology, the output of coal mines has increased rapidly. When mining high-gas coal seams, especially when mining thick coal seams and each layer group, it is lost from adjacent layers (including surrounding rocks and coal lines), coal pillars and mining space. A large amount of gas gushes out from the coal to the goaf of the mining layer. Especially in recent years, with the continuous advancement of the working face and the increasing area of ​​the goaf, the proportion of the gas emission in the goaf to the total gas emission in the mine is increasing day by day. The gas disaster has become an important factor restricting the development...

AI Technical Summary

Problems solved by technology

The increased air volume at the working face has caused serious air leakage in the goaf, which has greatly increased the risk of spontaneous combustion in the goaf, especially in the coal seams that are easily oxidized

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