Experimental Study on Impact of Repeated Heating on Coal Low Temperature Oxidation Characteristics

In order to study the infuence of repeated heating on coal spontaneous combustion law, the same coal sample using the independent design of oil bath type heating device were continuously repeated oxidizing test for two times, the concentration of the index gases was mesured under different temperature and the industrial analysis for each repeating coal sample was carried on, which obtained the oxygen consumption rate and judged coal sample oxidation ability after repeated heating. The result shows that the oxygen consumpation rate and the concentration of the index gases are an gradual increase trend with the increase of tempearture, however, they are an gradual decrease trend with the increase of number of repeated heating at the same temperature. It shows that the repetitive oxidation heating reduces coal oxidation ability.