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This paper presents results on CO2 gasification of 17 raw coals containing a wide range of volatile matter (21-57 wt%). The gasification is performed using a TGA under CO2 and also under N2 atmosphere. An amount of weight loss with increasing temperature is proportional to that of volatile matter in a coal under N2 atmosphere. Reactivity of CO2 gasification also increases with a content of volatile matter. However, the correlation is a little scattered. Oxygenated functional groups in a coal are generally reactive and therefore, an increase in O/C ratio leads to enhanced reactivity. However, CO2 reactivity is affected by neither H/C ratio nor a content of ashes that possibly activate the gasification reaction. These findings are also applicable to steam coal gasification and the reactivity series are confirmed in the test at a fixed bed reactor.

Characterization of CO2Gasification of 17 Coals With Regard to Coal Rank

Characterization of CO₂Gasification of 17 Coals With Regard to Coal Rank