Study on compartmentalizing danger zone of coal spontaneous combustion at 2268 working face of Shizuishan No.2 Mine

The spontaneous combustion characteristic parameters are measured by the selfignition testing Based on the actual survey in the working face,the distributions of the remain coal,the intensity of air leakage and the oxygen concentration in the gob are obtained And then the three zones are determined according to the actual values of the limit parameters Finally,on the basis of the shortest selfignition term of coal and the speed of the workfing ace advancing,the spontaneous combustion hazard zone in the gob are determined and the min. safe speed of 136 m/d face advancing is evaluated Providing evidence for Shizuishan No2 Mine in safety production and forecasting of fire disaster and putting out fire.