Hj. Muhlen et al., COMPARISON OF THE GASIFICATION BEHAVIOR OF A WEST AND EAST-GERMAN BROWN-COAL, Fuel processing technology, 36(1-3), 1993, pp. 185-191
Some experimental work has been carried out in a pressurized thermobal
ance to investigate the gasification behaviour of two German brown coa
ls, one stemming from the eastern part of Germany and the other one fr
om 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 o
f 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 bee
n used as gasifying agents. Analyses of the mineral matter of both bro
wn coals reveal considerable amounts of Calcium which is known for bei
ng a strong catalyst in coal gasification as far as it is finely dispe
rsed. Pressure dependent reactions of Calcium compounds leading to the
ir catalytic deactivation are assumed to influence the gasification be
haviour and hence to cause the decrease of the gasification rate with
increasing burn-off.