Abstract: In order to explore dangerous impacts of polyurethane on coal spontaneous combustion, kinetic characteristics before and after introduction of polyurethane were studied through experiment and analyzed by using thermal analysis. Then, kinetic parameters were calculated with Flynn-Wall-Ozawa (FWO) and Starink models. Finally, mechanism function was determined by Bagchi method. The results show that with existence of polyurethane, reaction is accelerated and weight loss rate increases greatly in the initial stage (168-300 ℃). However, the latter becomes relatively mild in subsequent stage of high temperature (465-714 ℃) with value of activation energy being increased by about 6 kJ/mol compared with that before addition of polyurethane. And when reaction stops, final residual mass is approximately zero, and reaction is more complete than that of coal pyrolysis alone. Anthracite coal conforms to the randomly nucleating and nucleus growth model while mixture of coal and polyurethane is more inclined to first-order chemical reaction mechanism.

Key words: coal spontaneous combustion, polyurethane, thermal analysis, activation energy, mechanism function