Method for treating emission of harmful gas in overlying goaf

Abstract

The invention discloses a method for treating emission of harmful gas in an overlying goaf, belongs to the technical field of coal mine harmful gas treatment, and aims at solving the safety problems that the existing method for treating emission of harmful gas in the overlying goaf needs to increase the air volume, so that the oxygen amount is sufficient, and residual coal in the goaf is spontaneously combusted easily. According to the method, drill holes are reasonably formed in the ground position of the working face of the pre-mining coal layer with the overlying goaf, the drill holes are drilled to the nearest goaf of the pre-mining coal layer for well completion, negative pressure extraction is conducted on the ground, and the problem that harmful gas in the goaf is discharged downwards is effectively solved by reasonably adjusting the ground extraction pressure. And compared with a voltage-sharing technology, safety and rapidness are realized.

Description

technical field [0001] The invention belongs to the technical field of controlling harmful gas in coal mines, and in particular relates to a method for controlling the leakage of harmful gas in an overlying goaf. Background technique [0002] There are Jurassic and Carboniferous in the dual-series coal seam area. At present, the mining of the Jurassic coal seam is almost completed. Since there are many recoverable coal seams in the Jurassic, many goafs have been formed vertically after mining, and The vertical spacing of each goaf is small, and the Carboniferous thick coal seam and extra-thick coal seam are the main mining coal seams. Due to the thick coal seam, the overlying rock has high strength and strong destructive power. Communication can easily induce the leakage of harmful gas in the goaf, which seriously threatens the life safety of the operators and brings great hidden dangers to the safe production of mines. [0003] Pressure equalization ventilation is usually ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at solving safety problems such as spontaneous combustion of residual coal in the goaf due to the need to increase the air volume in the existing method for solving the leakage of harmful gas in the overlying goaf, and provides a method for controlling the overlying goaf The method of releasing harmful gas is to drill holes in the goaf on the working face of the coal seam, and directional extract the harmful gas in the goaf of the layer closest to the coal seam, and combine the underground ventilation pressure to reasonably control the ground drainage negative pressure , so as to prevent the leakage of harmful gas and serve the safety production of coal mines

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