Meikuang Anquan (Aug 2024)
Determination and prevention technology of spontaneous combustion danger zone in shallow and deep coal seam
Abstract
In the mining process, the shallow buried deep coal seam working face is more likely to produce cracks connected with the ground due to the influence of mining, which leads to the increase of air leakage and oxygen supply in goaf and the increase of hidden dangers of spontaneous combustion of residual coal. In order to try to solve this problem, taking 1201 of the first mining face of No.2 coal seam in Lijiata Coal Mine as the research object, the ventilation parameters of the working face and the change law of oxygen volume fraction on both sides of inlet and return air in goaf were measured in site; CFD simulation simulates the distribution characteristics of hazard areas in goaf under different air supply rates. On this basis, the trinity comprehensive fire prevention and extinguishing technical measures of spontaneous combustion of residual coal in goaf are proposed, which are “inert cooling in oxidation zone, wind control and plugging in air leakage zone, covering residual coal and blocking coal oxidation reaction”. The results show that the distribution range of spontaneous combustion danger in goaf of 1201 working face is 86-222 m on the air inlet side and 54-156 m on the air return side.
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