Technology for preventing natural ignition and gas explosion of goaf coal seam by adopting isolation method

Abstract

The invention provides a technology for preventing natural ignition and gas explosion of a goaf coal seam by adopting an isolation method. The technology for preventing natural ignition and gas explosion of the goaf coal seam by adopting the isolation method uses an isolation device capable of expanding through air inflation, so that the inflated and expanded isolation device is in tight contact with collapsed or incompletely collapsed top and base plates in a goaf to isolate the goaf. By adopting the technology for preventing natural ignition and gas explosion of the goaf coal seam by adopting the isolation method, the goaf can be effectively isolated, the oxygen content in the goaf can be lower than a critical value, the natural ignition of the coal seam can be avoided, the gas explosion of the goaf can be prevented, and meanwhile the gas leakage in the goaf can be alse prevented.

Description

technical field [0001] The invention relates to the field of coal mining engineering in coal mines, in particular to an isolation method for preventing spontaneous combustion and gas explosion of coal seams in goafs. Background technique [0002] Conditions for spontaneous combustion of coal seams: (1) Low-temperature oxidative properties, that is, coals with a tendency to spontaneous combustion exist in a broken state; (2) Air with an oxygen content greater than 12% passes through these crushed coals; The coal body has an environment for accumulating oxidation heat; only when these three conditions are met at the same time, and last for a certain period of time, can coal spontaneously ignite and ignite. [0003] Conditions for gas explosion: (1) The gas concentration is 5%-16%, which is also affected by factors such as temperature, pressure, coal dust, other flammable gases, and inert gases; (2) The ignition temperature is 650°C- 750°C. However, it is subject to changes d...

AI Technical Summary

Problems solved by technology

[0005] During the mining process, the roof of the goaf can fall in time during normal advancement, filling the mining space, which can effectively prevent air leakage and gas gushing out of the goaf; If it falls, the air leakage in the goaf will increase, resulting in an increase in oxygen content, which will oxidize the floating coal or the exposed coal seam, and the gas in the gob will be released to the working face and the return air flow

At present, in the mining process, to prevent spontaneous combustion or explosion accidents, nitrogen injection in the goaf, spraying of yellow mud or grouting (some use inhibitor spraying), and masonry of a certain length of gangue or yellow mud at the upper and lower corners of the working face are generally adopted. Measures such as the bag partition wall and the hanging of windshield curtains on the side of the goaf in the working face, but the actual effect cannot meet the requirements and the purpose of prevention cannot be achieved

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