Method for preventing spontaneous combustion of residual coal in goaf during end mining-stopping and withdrawing period of working face

Abstract

The invention discloses a method for preventing spontaneous combustion of residual coal in a goaf during an end mining-stopping and removing period of a working face. The method comprises the following steps of 1, carrying out construction preparation; 2, presetting a grouting pipeline and a nitrogen injection pipeline; 3, presetting a goaf gas monitoring beam tube; 4, blocking an isolation wall before end mining; 5, pushing blocking and inerting residual coal in the process that the coal face to the stop line; 6, after stopping mining, blocking the separating wall and inerting residual coal at the rear part of a hydraulic support; and 7, withdrawing the support. According to the method, the advanced treatment thought of the spontaneous combustion hidden danger of the vertical coal is established, and the residual coal in the goaf is inerted and blocked by adopting a comprehensive fire preventing and extinguishing technical means in the end mining stage, so that the residual coal in an air inlet way and an air return way of the working face can be inerted and cooled, the inert oxygen state of the goaf can be ensured, the aim of prolonging the spontaneous combustion period of the coal is fulfilled, time is won for safe support withdrawal of the working face hydraulic support, the safety of personnel and property during the support withdrawing period is also guaranteed, and the method can be used for reference of similar coal mines.

Description

technical field [0001] The invention belongs to the technical field of blasting construction in tunnel engineering, and in particular relates to a method for preventing spontaneous combustion of residual coal in a goaf during the end-mining-stop-withdrawal period of a working face. Background technique [0002] The coal industry is an important basic industry in my country, and an important industry and key field related to the security of the national economy. With the development of mining technology and mining equipment, the construction of super-large and efficient mines has become the development direction of my country's coal industry. However, with the depletion of shallow resources and the extension of deep resources, the mining environment is becoming more and more complex (deep coal seam burial, high temperature of surrounding rock, high soluble water, etc.), and the disaster-causing factors are becoming more and more diverse, superimposed and complicated. , which...

AI Technical Summary

Problems solved by technology

Due to the promotion of fully mechanized top-coal caving technology in my country, while increasing the coal output, but due to the shortcomings of the technology, the two top-coal cavings are not recovered, and the recovery rate of the top-coal caving can only reach about 70% to 80%, resulting in mining There are two goafs and a large amount of residual coal in the goaf, and the residual coal is seriously broken and piled up in a state of natural accumulation. In addition, the mining speed is slow during the end-mining period of the working face and the support removal period is long. The superposition of various factors causes the coal to spontaneously ignite very high probability

[0003] According to the requirements of the "Coal Mine Grouting Fire Prevention Technical Specifications" implemented on July 1, 1998, the amount of slurry, grouting volume, and grouting area of ​​modern large-scale mines are far from meeting the requirements of the current grouting fire prevention technical specifications, and Modern new materials (colloids, liquid CO 2 etc.) to prevent fire extinguishing effects, so for the long-term fire prevention and extinguishing work during the retraction period of the existing fully mechanized caving face, it is necessary to start from a new process, a new management idea, and a new system to prevent coal spontaneous combustion

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