Development of pressurized coal partial combustor (characteristics of 7T/d gasifier with various coal-feed ratios)

摘要

A pressurized coal partial combustor (P-CPC) with two stage coal supply was tested to elucidate the characteristics of a 7T-coal/d air-blown coal gasifier. As the secondary coal feed ratio (2ry coal/total coal) was increased, the following phenomena were observed, indicating depression of the coal gasification reaction; ① decrease of CO and H{sub}2 concentrations, ② decrease of calorific value of product gas, ③ increase of hydrocarbon (CH{sub}4 ＋ C{sub}2H{sub}6) content, ④ decrease of carbon conversion efficiency. Secondary coal supply is effective for stable slag discharge and the prevention of the slagging problem in a reductor due to the rapid temperature drop of molten slag. In conclusion, as long as stable slag discharge is obtained, it is effective to lower the 2ry coal feed ratio to promote the coal gasification reaction, resulting in, for example, higher calorific value of the product gas.