Effects of Calcium Compounds on the Steam Gasification of Сarbonized Brown Coal

Abstract

The results of a study of the steam gasification of carbonized brown coal samples at 700°C depending on the composition of mineral components, textural properties, structural ordering of the organic matter, and the type of a gasifier are reported. It was found that the native calcium content is the main factor responsible for the reactivity of carbonized brown coal. Treatment with acid solutions led to the almost complete extraction of calcium, which was accompanied by a sharp decrease in reactivity upon gasification. It was hypothesized that the found behavior was associated with the participation of native calcium compounds (in oxide and/or carbonate forms) in the catalysis of carbon gasification reactions with water vapor.