Fire Preventing and Extinguishing Technology in Fully Mechanized Caving Face of Extra-thick Coal Seam

Xinjiang Wudong Coal Mine +5754501 working face has the problems of a small kiln mining history, spontaneous combustion in overlying old area, and the open fire area in exposed coal seam during the pressure relief of surface roof. For the special mining conditions existing in +5754501 working face, the comprehensive fire preventing and extinguishing technology measures such as pressure equalization ventilation, advanced nitrogen injection and nitrogen injection, and effectively prevent the spontaneous combustion and re-ignition in open fire areas in mining areas of the small kiln, overlying old empty area, goaf and the original surface.