Research On The Ignition Rule And Control Technology Of The Easy Spontaneous Combustion Coal Seam Working Face Of The No.2 Mine In Selian

The coal occupies the main position in Chinese energy structure. However, the coal spontaneous combustion seriously threats the safety of coal production, and causes great waste of coal. The working face 12205 of the No.2 mine in Selian, which is 2m lower than a coal seam with 1m thickness, has a complex geological condition. Along with the working face mined, the coal was fragmentized and got into the goaf. Because this coal seam has a short spontaneous combustion time and a high spontaneous combustion tendency, it would cause a serious consequence once the coal spontaneous combustion occurred.The paper is based on the data from the experiment and coal field. The characteristic parameters of coal spontaneous combustion, such as the heat liberation intensity, oxygen consumption rate, the shortest spontaneous combustion time, and index gases were tested through a large scale experiment of coal spontaneous combustion. The gas concentration distribution in different positions of goaf, the air leakage intensity and the oxygen concentration were studied, through the field observation and numerical simulation by fluent software. In the last, the " three zones" of coal spontaneous combustion in the goaf was determined, providing the basis for the prevention and control of coal spontaneous combustion.Based on the coal spontaneous combustion experiment and field observation, the fire prevention and extinguishing measurements were given that the “nitrogen injection and oxygen reduction” measures is primary, and the“grouting cooling plugging”is secondary. The monitoring and warning indices of spontaneous combustion and the rapid emergency control technology of overrunning CO were designed, constituting the prevention and control technical system of coal spontaneous combustion of the goaf from the working face 12205 in the No.2 mine of Selian.It was used to guide the coal spontaneous combustion prevention and control,and had a good effect. It also provided security for this working face and other working faces.