New classifying method of the spontaneous combustion tendency

Studied coal spontaneous combustion characteristic of Shendong mining area at different layers and working faces by using thermal gravimetric analyzer experiment. The studying results show that, the process of coal oxidation combustion can be divided into three phases, which are calefactive-evaporated-alleviative phase, calefactive-weight incremental-oxidation phase, calefactive-combustion-alleviative phase. The corresponding three phases activation energy are respectively evaporation activation energy, ignition activation energy and combustion activation energy. Ignition activation energy is from weight increment to weight increment be over and turn in to weight loss phase activation energy, which is a new method that bases on the coal ignition activation energy to determinate coal spontaneous combustion difficultly or easy. The less ignition activation energy, the coal sample is easier to spontaneous combustion, and the more ignition activation energy, the coal sample is more difficult to spontaneous combustion.