Determination of the Self-Heating Temperature of Coal by Means of TGA Analysis

In this study, the self-heating tendency of Tavşanlı (Turkey) coal was investigated by the apparatus of thermal analysis. TG-DTG and DSC-DDSC plots obtained at air atmosphere from 25 to 800 °C were used to determine the self-heating temperature (Tsh) and the combustion behavior of coal. The self-heating temperature changes versus the particle sizes of coal and heating rates were examined . Also, kinetic parameters of the main combustion region were obtained in the temperature range of 25 to 800 °C at different heating rates (1, 2.5, 5, and 10 °C min–1) under nonisothermal heating conditions at air atmosphere. The activation energy, pre-exponential factor, and reaction mechanism were calculated by using KAS, FWO, Coats–Redfern, and Master-Plot methods. It was understood that the oxidation process of coal was controlled by the first order [F1: −ln (1 – α)] mechanism.