Role of calcium Hydroxide in Supercritical Water Gasification of Low-Rank coal

摘要

Gasification of low-rank coals in supercitical water was carried out in an autoclave by heating temperature to 690deg.C and elevating autogenous pressure to 30 Mpa. An attempt was made to investigate the catalytic effect of calcium hydroxide on the gasification. It was found that the presence of Ca(OH)_2 facilitates the extraction of volatile matter from coal and the decomposition of the volatile matter to small molecule gases, with a decrease in the amount of residual char.