Gob natural fire control method

Abstract

The invention relates to the coal mine safety technology and discloses a gob natural fire control method which has good effect of fire preventing and extinguishing. The gob natural fire control method comprises the following steps: pouring nitrogen, wherein a nitrogen pouring point is 30 to 60 meters from a working face, and the amount of the liquid nitrogen is 2000m3 / h; reducing the air leaking volume of a gob, and reducing the pressure difference of the working face, and controlling the pressure difference of the working face within 120Pa; blocking the leakage within an area in which the tight caving cannot be achieved due to the cantilever beams formed at an air inlet side and an air return side of the gob through a top plates, and timely closing a transverse rail at the gob; accelerating the advance velocity of the working face, wherein the working face is at the speed of 4m / d; increasing the recovery ratio; and controlling the thickness of the residual coal to be below 1.3 meters. According to the gob natural fire control method, a comprehensive working face gob comprehensive fire preventing and extinguishing measure based on 'nitrogen pouring first, leakage blocking, wind resisting, accelerating of advance velocity and recovery rate increasing second' is proposed, and measure implementing parameters are provided; with the adoption of the method, the effect of preventing and extinguishing the fire of the gob can be improved; and the mining on the working face can be ensured to be smoothly carried out.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to a method for preventing and controlling spontaneous combustion in goafs. Background technique [0002] Mine fire is one of the major natural disasters in coal mines. Mine fires can not only cause huge material losses in mines, but also an important source of casualties for underground workers. Toxic and harmful gases produced by natural fires in coal mines, fire gases, gas explosions and other accidents have seriously threatened the life safety of miners and deteriorated the natural environment, which has become one of the key factors restricting coal mine safety production. With the advancement of science and technology and the improvement of management level, although the fire rate of one million tons of coal mines in my country has decreased year by year, spontaneous combustion fires in coal mines in my country are still relatively serious. There are 42 spontaneous ...

AI Technical Summary

Problems solved by technology

(4) In the early stage of mining, top coal caving is basically not carried out before the first pressure, the recovery rate of top coal is low, and the amount of residual coal is large. In addition, there are no corresponding fire prevention facilities such as nitrogen injection and grouting in the early stage of mining, and a large amount of residual coal is in the Loose accumulation is also an important cause of spontaneous fires.

[0004] At present, grouting and spraying inhibitors are mostly used for fire prevention and extinguishing. The disadvantage is that the operability is not strong and the fire prevention effect is limited.

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