Fire Prevention and Control Technology of High-stress Super Long Working Face During the Finish Period

For the coal seam of high stress and spontaneous combustion, due to the difficult maintenance of crossheading up and down the working face caused by high stress, the stop and finish time was long, and the possibility of spontaneous combustion of residual coal in goaf increased. In order to prevent the spontaneous combustion of residual coal in 111303 working face of Kouzidong Coal Mine, based on the forecast of spontaneous combustion, advancing pre-embedded fire protection pipelines were used, combined with comprehensive fire prevention and control technologies, such as grouting, nitrogen injection, liquid CO₂ injection, Remy material injection and so on. Meanwhile, the drilling grouting and gel injection were applied in the high temperature oxidation region of working face. The practice proved that technology effectively ensured the safety mining of high-stress super long working face in the 1 000 m deep mine, which provided a reference for the fire prevention and control work during the finish period in such working face.