Joint treatment method for gas and coal spontaneous combustion in night distance seam mining

Abstract

The invention discloses a joint treatment method for gas and coal spontaneous combustion in night distance seam mining. Gas gushing out of a stope working face is treated through a 'two intakes and one return' working face ventilation system, long drill holes in the trend of a fissure zone are utilized to replace a high pumping lane to extract gas gushing out of residual coal of night distance seams and a coal seam, thus corner gas overflow on the stope working face is avoided, and the gas extraction project cost is reduced. Gas injecting pipelines are arranged on a belt gate roadway of the stope working face to continuously inject liquid carbon dioxide into a goaf to restrain spontaneous combustion of the residual coal of the coal seam, low-position drill holes are formed in a track gateroadway of the stope working face to inject nitrogen to prevent spontaneous combustion of the coal of the night distance seams after extraction collapse, thus a coal spontaneous combustion three-dimensional preventing and control system of the goaf is formed, float coal spontaneous combustion in the goaf is accurately prevented and treated, finally, the purpose of joint treatment for gas and coalspontaneous combustion in night distance seam mining is achieved, the coal recovery rate of coal and the working face stoping continuous speed are increased, and safe production of the tope working face is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of mine gas and fire prevention and the like, and in particular relates to a method for co-controlling gas and coal spontaneous combustion in extremely close-distance coal seam mining. Background technique [0002] Mine gas explosion and coal spontaneous combustion are the main disaster situations in coal mines. In many mining areas in my country, these two disasters present a symbiotic trend; on the one hand, the coal seam gas content is high, and at the same time, the risk of spontaneous combustion is also relatively high. The symbiosis of coal seam gas and spontaneous combustion makes disaster prevention and control complicated and difficult. Scholars at home and abroad have carried out some research on the interaction between gas and coal spontaneous combustion; Zhou Fubao et al. studied the internal correlation and disaster-causing mechanism of the coexistence of gas and coal spontaneous 4 Concentrati...

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Problems solved by technology

However, the existing co-governance methods of gas and coal spontaneous combustion are mainly used for single coal seam and close-distance coal seam mining, and no research has been found on the co-governance of gas and coal spontaneous combustion in extremely close-distance coal seam mining; The spacing is small, and the adjacent coal seam is within the range of the caving zone above the mining coal seam. As the working face of the mining coal seam advances, the adjacent coal seam falls and accumulates in the mined-out area of ​​the mining coal seam in the form of floating coal. Therefore, the mining coal seam The goaf includes both the floating coal mined in this coal seam and the floating coal in the adjacent coal seam, and the two layers of floating coal are separated by falling gangue, forming a three-dimensional floating coal in the goaf space. As the working face advances, the two layers of floating coal Coal will desorb gas and has a tendency to spontaneously ignite. Therefore, it is necessary to propose a method of co-controlling gas and coal spontaneous combustion in extremely close-distance coal seam mining. Overrun, on the other hand to prevent the natural ignition of two layers of floating coal

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