Abstract
Some experimental work has been carried out in a pressurized thermobalance to investigate the gasification behaviour of two German brown coals, one stemming from the eastern part of Germany and the other one from the Rhine region. In order to determine their kinetics with regard to fluidized bed conditions the gasification has been investigated in the temperature range of 1073 up to 1123 K and in the pressure range of 1 up to 20 bar. Pure steam and carbon dioxide as well as mixtures of steam and hydrogen and of carbon dioxide and carbon monoxide have been used as gasifying agents. Analyses of the mineral matter of both brown coals reveal considerable amounts of Calcium which is known for being a strong catalyst in coal gasification as far as it is finely dispersed. Pressure dependent reactions of Calcium compounds leading to their catalytic deactivation are assumed to influence the gasification behaviour and hence to cause the decrease of the gasification rate with increasing burn-off.
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