|
Abstract Based on the monitoring results of goaf data in Majunyu coal mine working face, the distribution law of oxygen concentration and air leakage intensity in goaf is analyzed, the range of spontaneous combustion danger area in working face is divided, and the key area of fire prevention and extinguishing work in 90303 working face is determined. The results show that the working face open-off cut, stop mining line, transportation crossheading and overlying non-coal seam are the key areas of fire prevention and extinguishing. The distribution range of oxygen concentration in the goaf of 90303 working face is small, and the distribution range of oxygen concentration in the side of the roadway is relatively deep. The distribution range of the heat dissipation zone in the goaf on the side of the air intake roadway in the working face is within 0 ~ 50 m from the working face, the range of the heat dissipation zone is relatively shallow, and the depth of the suffocation zone is relatively shallow ; due to the large air leakage and the deep heat dissipation zone, the suffocation zone is in the deep part of the goaf 170 m away from the working face, and the width of the oxidation heating zone is 90 m.
|
