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

In this study, the self-heating tendency of Tavsanh (Turkey) coal was investigated by the apparatus of thermal analysis. TG-DTG and DSC-DDSC plots obtained at air atmosphere from 25 to 800 degrees C were used to determine the self-heating temperature (T-sh) 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 degrees C at different heating rates (1, 2.5, 5, and 10 degrees 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 [F-1: -ln (1 - alpha)] mechanism.