Study On Coal Spontaneous Combustion Prevention And Control Technology In 3204 Mechanized Working Face Mine Goaf Of Chenjiagou

Coal seam spontaneous combustion is due to the oxidation of coal and oxygen from the release of heat,the accumulation of a certain degree of results, and mining coal seam for coal seam spontaneous combustion provides the necessary conditions for the effective control of coal mining spontaneous combustion , To prevent the fire caused by this, made in Chenjiagou Coal Mine 3204 fully mechanized top coal caving mining face coal spontaneous combustion control technology research has a very important practical significance.In this paper, the coal spontaneous combustion experiment is carried out to test the spontaneous combustion days and spontaneous combustion characteristics of coal in the coal mining area of Chenjiagou Coal Mine. The parameters of coal spontaneous combustion were analyzed, and the lower limit oxygen concentration and the upper air leakage intensity at different thickness of floating coal were calculated, and the ultimate floating coal thickness was calculated when different air leakage intensity was calculated.Through the observation of the scene, the distribution of the horizontal and vertical "three zones" of the working face is obtained. Based on the analysis of 3204 numerical simulation model, the oxygen concentration distribution, oxygen permeation velocity and seepage direction of the goaf were analyzed by using Fluent software. The five parameters of spontaneous combustion in the goaf of 3204 fully mechanized coal caving face Based on the conditions of the spontaneous combustion zone in the mined-out area, the risk area of the spontaneous combustion zone in the goaf of 3204 working face is obtained as the central part 26 meters to 80 meters or so, the return side of the distance from the eyes of 18 meters to 110 meters or so, into the wind ranging from 18 to 65 meters in the range of mined areas for the spontaneous combustion area, the best speed to promote Less than 3 meters per day.Based on the actual mining practice of 3204 fully mechanized top coal caving face in Chenjiagou Coal Mine, 3204 fully mechanized coal caving mining face is developed, which is scientific and fireproof, has been targeted and invested with limited safety funds. To the most needed places, to play the greatest security benefits. The face in October 26, 2014 the official recovery, May 3, 2015 recovery is completed,3204 face output of 1,717,100 tons, the face recovery rate of 91.45%, no fire, the use of fire prevention measures To the proper role.