Effect of cleaning process on the combustion characteristics of two different rank coals

In this research, thermogravimetry (TG/DTG) was used to determine the combu stion characteristics of two different rank coals (Tuncbilek and Af in Elbi stan) before and after cleaning process. Applying sink-float process cleane d raw coal samples, and optimum-separating densities for each sample was de termined using the criteria of "degree of washability". The results indicat ed that coal cleaning was very effective on Tuncbilek sample due to its hig h rank. TG/DTG analysis of raw and cleaned samples indicated different reac tion regions occurring at different temperature intervals. Easy combustibil ity and long-lasting combustion were the distinctive effects of coal cleani ng on raw coals. Kinetic analysis of the samples showed that clean coals re quire lower activation energies to initiate the combustion process than raw coals.