Rapid Pyrolysis Desulfurization Characteristics of High Sulfur Coals from China

Abstract

Four high sulfur and high rank Chinese coals (Nan Tong, Fu Rong, Yanzhou (B) and Zhong Liang Shan) were pyrolyzed rapidly in a nitrogen stream by us-ing a free fall pyrolyzer. Rapid pyrolysis desulfurization, devolatilization and swelling behaviors were different from coal to coal though the four coals have same carbon con-tent. The extent of organic sulfur removal from solid phase ranged from 19% for Zhon Liang Shan to 89% for Fu Rong coals.
Nan Tong, Fu Rong and Yanzhou (B) coals were fractionated into three groups by a sink-float method and each group was pyrolyzed rapidly. The highest specific gravity group of Fu Rong coal containing the highest organic sulfur showed the highest removal of organic sulfur. The lowest specific gravity group of the Nan Tong and Yanzhou (B) coals were desulfurized higher than other groups. The extent of organic sulfur removal decreases linearly with the increase of average specific gravity with exception of the highest specific gravity group and non-separated sample of Fu Rong coal.