Flue gas displacement reinforced goaf gas extraction and goaf fire preventing and controlling method

Abstract

The invention relates to a flue gas displacement reinforced goaf gas extraction and goaf fire preventing and controlling method. The flue gas displacement reinforced goaf gas extraction and goaf firepreventing and controlling method is suitable for underground use of a coal mine, and comprises the steps that during the stoping process, a rock stratum above a goaf is broken and moved, an annular fracture zone is formed at the position of a caving arch, gas released in the stoping process is enriched, and gas injection pipelines are arranged on a roadside of the outer side of an air inlet lanein a paved mode and buried into the goaf; a drilling field is arranged at one side of an air return lane, pumping and extracting drilling holes are formed in from a drilling field to the caving arch position of the goaf, factory waste flue gas is injected into the goaf through the gas injection pipelines, and the gas enriched in the fracture zone is pumped and extracted through the pumping and extracting drilling holes; the flue gas is used for inhibiting the spontaneous combustion of residual coal in the goaf, the flue gas is injected into the goaf to balance the air pressure in the goaf by using belt pressure, and the air leakage of a working surface to the goaf is weakened; and flue gas is used for replacing, displacing and lifting the gas in the residual coal and surrounding rock to float to the fracture zone, and the gas pumping and extracting amount and the gas pumping and extracting concentration in the pumping and extracting drilling holes are improved to achieve the effects ofthe prevention and control of the fire in the goaf and improving the quality of the gas pumping and extracting.

Description

technical field [0001] The invention relates to a goaf gas extraction and goaf fire prevention method, in particular to a smoke displacement enhanced goaf gas extraction and goaf fire prevention method. Background technique [0002] During the production process of the mine, the goaf formed by back mining is filled with fallen gravel and residual coal, and has high air permeability, which leads to the enrichment of gas released from adjacent surrounding rocks and residual coal in the goaf, and also makes the work face the mining area. Severe air leakage in the empty area. When fresh air enters the goaf, the oxygen brought in will oxidize the residual coal and induce spontaneous combustion disasters in the goaf; at the same time, the wind will bring out the free gas in the goaf, which will easily lead to the upper corner of the gas exceeding the limit, and also make the mine a potential gas explosion The risk factor rises. [0003] Gas drainage in gobs is often carried out ...

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Problems solved by technology

[0005] Purpose of the invention: the purpose of the present invention is to provide a method capable of extracting gob gas and effectively preventing goaf fires, so as to solve the current existing goaf spontaneous combustion disasters, air leakage in the work-oriented goaf and gas in the gob Problems such as poor extraction effect

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