Characterization of burning and CO2 gasification of chars from mixtures of Zonguldak (Turkey) and Australian bituminous coals

In this study, different mixtures (30 wt.% + 70 wt.% and 50 wt.% + 50 wt.%, respectively) of Zonguldak bituminous coal (Turkey) and an Australian bituminous coal are carbonized to obtain that samples. The ignition temperatures of the samples are determined by sending 02 onto the samples in a system designed for determining the ignition temperature. The gasification reactivity of the chars in a CO2 atmosphere is also measured at temperatures between 800 degrees C and 1050 degrees C. The relationship between the ignition temperature and the burning character of the same samples is investigated thermogravimetrically. The moisture, ash and volatile matter analyses are also performed. An increase in carbonization temperature leads to a decrease in the amount of volatile matter. The differences between the effects of volatile matter on the ignition temperature and the gasification reactivity of the samples with CO2 might be explained by the change in pore structure and the varying catalytic effect of mineral components in the structure. It is also seen that there is a good correlation between the thermal analysis and the complete analysis results of the samples. (c) 2005 Elsevier Ltd. All rights reserved.