U-shaped ventilation working face goaf full-face curtain nitrogen injection fire preventing and extinguishing method

Abstract

The present invention relates to a U-shaped ventilation working face goaf full-face curtain nitrogen injection fire preventing and extinguishing method comprising determining the nitrogen flow rate QN of a main pipeline, and is characterized in that the laying number of nitrogen injection pipes n0=int(Ly / Lb+1). When n0=3, the method comprising steps of (1) laying the first nitrogen injection pipe full face along an inner side of a rear chute at the rear portion of a support, propelling to a position away from a goaf boundary with an LK distance in the working face propelling direction along a coal face, performing leaking stoppage on upper and lower ends, and enabling a control valve of the nitrogen injection pipe to continuously inject nitrogen to the goaf full face; (2) propelling to a position where a distance between two nitrogen injection pipes is goaf nitrogen injection pipeline array pitch Lb along the coal face, repeating the method (1) to lay the next nitrogen injection pipe, and achieving nitrogen injection of the next nitrogen injection pipe; and (3) repeating the method (2) to achieve continuous nitrogen injection to the goaf full face by the third nitrogen injection pipe. A continuous nitrogen curtain is formed at the whole goaf by nitrogen injection, residual coal low-temperature oxidation is suppressed, nitrogen is prevented from rushing into the coal face, the nitrogen diffusion radius is fully utilized, and the nitrogen diffusion effect and nitrogen inerting efficiency are improved.

Description

technical field [0001] The invention relates to a method for preventing and extinguishing fires by injecting nitrogen into goafs in coal mines, and also relates to a method for preventing fires by injecting nitrogen into full sections of goafs, in particular to a method for preventing and extinguishing fires by injecting nitrogen into full-section curtains in goafs of U-shaped ventilated working faces. Background technique [0002] Coal spontaneous combustion fire is one of the main disasters in mines in my country. Coal mine fire accidents will not only produce a large amount of toxic and harmful gases, which seriously threaten the life safety of underground workers, but also cause secondary disasters such as coal dust and gas explosions caused by fires. In recent years, the theory and technology of coal spontaneous combustion prevention and control have been well developed in my country, especially the application of some new technologies, new processes and new materials, w...

AI Technical Summary

Problems solved by technology

However, the nitrogen injection methods have the following problems: the nitrogen diffusion radius is small, and the effective range is limited; it is greatly affected by the air leakage in the goaf, and the distribution is uneven in the gob; the number of release ports is small, and the inerting efficiency is low

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