Influence of Gas Drainage in “U+L” Ventilation Face on Spontaneous Combustion Danger Area in Goaf

To grasp the distribution of dangerous areas in working face and better coordinate gas extraction and fire prevention work in working face, this paper adopts the method of field test to carry out experimental research on typical working face. A beam tube sampling port and a temperature measuring device are installed at every 30 m on the return air side of the goaf. The gas composition and temperature data of goaf are continuously tested with the advancing of working face. By adjusting the way of gas drainage, the distribution of spontaneous combustion danger area in goaf is tested. The experimental results show that U+L type ventilation combined with gas drainage can solve the problem of gas exceeding limit well, but it will cause serious air leakage in goaf. By eliminating unreasonable gas drainage methods, it can ensure that gas drainage in working face meets the requirements of safe production, while the risk area of spontaneous combustion in goaf is obviously reduced, and the risk of spontaneous combustion in goaf is reduced.