Fire preventing and extinguishing system for coal mine fully mechanized caving face in mining stopping period in flood season

Abstract

The invention discloses a fire preventing and extinguishing system for a coal mine fully mechanized caving face in the mining stopping period in the flood season. A front drilled hole, a middle drilled hole and a rear drilled hole are formed in a front beam frame, a top beam and a tail beam of each support of the coal mine fully mechanized caving face respectively, first drilled holes, second drilled holes, third drilled holes, fourth drilled holes, fifth drilled holes and sixth drilled holes are formed in end openings of two gate roads, and high holes, middle holes and low holes are formed from the two gate roads of the coal mine fully mechanized caving face to goafs on the adjacent sides; after mining stops, the drilled holes formed in the corresponding areas are filled with high-efficiency cementing materials in a circulating pressure injection mode, the goafs of the coal mine fully mechanized caving face are filled with three-phase foam in an injection mode, the heat storage environment of float coal is damaged, the hidden danger of fires is eliminated, the phenomenon that fires happen on the coal mine fully mechanized caving face in the mining stopping period in the flood season is completely eradicated, and the safety degree of a mine in the mining stopping period is improved.

Description

technical field [0001] The invention relates to the field of fire prevention and extinguishment of coal mining working faces in coal mines, in particular to a fire prevention and extinguishing system for coal mine fully mechanized caving faces during the stoppage of mining during the flood season. Background technique [0002] The fully mechanized caving face of coal mines is one of the main places where spontaneous combustion and spontaneous combustion hazards occur. Mine fires seriously threaten the safe production of mines and the physical and mental health of miners. At present, the main measures taken to solve the problem of natural fire in the fully mechanized caving face are: sealing the roadway and spraying the surface, pressure equalization technology to control air leakage, injecting nitrogen or inert foam to inert the fire zone, injecting grout or glue to reduce temperature and oxygen isolation, coal seam Water injection for heat absorption and cooling. However, ...

AI Technical Summary

Problems solved by technology

Although due to the large heat dissipation space at both ends, it is not easy to cause a spontaneous fire at the end, but a large amount of coal residue and a moderate amount of air leakage have become a major hidden danger of spontaneous fire in the fully mechanized caving face

[0005] Among the hidden dangers of natural fires during the stoppage of fully mechanized caving working faces, spontaneous combustion fires in goafs have strong concealment, which means that spontaneous combustion fires all occur in the middle part of a certain depth from the exposed surface, where the air leakage intensity is moderate, the wind speed is slow, and the oxygen concentration is suitable. Spontaneous combustion high temperature point is formed by meeting the spontaneous combustion conditions of coal, and the oxidation zone and spontaneous combustion zone of coal left in the goaf are generally 30m behind the working face. , once an abnormality occurs in the working face, the fire in the goaf has already formed, and it is very difficult to extinguish the fire

[0006] The hidden danger of natural fire during the shutdown of the fully mechanized caving face is that there are more and more broken coals on the top of the support at the stop of the fully mechanized caving face. When the mining was stopped, the degree of fragmentation of this part of the coal was small, mainly in the form of cracks. As time went by, the degree of fragmentation gradually increased. Longer, so that this part of coal has a longer time to oxidize and accumulate heat, and if the heat is not dissipated in time, spontaneous combustion is more likely to occur

[0007] Therefore, the existing technology cannot guarantee the safety of mining during the special period of stoppage during the flood season, and needs further improvement and development

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