Coal gangue is mainly composed of C, H, O, N, S and other elements and inorganic minerals. The pyrolysis process of coal gangue is essentially a process in which these elements undergo violent oxidation reactions. The process mainly includes drying, dehydration, and pyrolysis. The three steps of sub-combustion and coke combustion, in which the pyrolysis process is the initial stage of the thermal conversion process of most carbonaceous fuels, plays an important role in the subsequent conversion of carbonaceous fuels (combustion, gasification, liquefaction, carbonization)