<総説>石炭中の硫黄形態と脱流特性

概要

論文の詳細を見る
Removal of sulfur, nitrogen and ash-forming minerals from coal by pretreatmentis one of the promising technologies not only to lower the damage ofenvironment but also to accelerate the development of efficient coal utilizationprocesses. This review concerns sulfur in coal which causes air pollution andacid rain in the world. The origin and forms of sulfur in coal, analytical methodof sulfur forms, distribution of sulfur in macerals, sulfur behavior duringheat treatment, and advanced desulfurization technologies are discussed.Sulfur in coal was derived from (1) sulfate in sea water that overlaid peatswamps and (2) parent plant material. Lower density group of organic matrixwhich is composed of exinite and vitrinite contains high sulfur. XANES analysisindicates that the low-density group contains sulfide and sulfoxide, which couldcontribute to the high extent of organic sulfur removal during rapid pyrolysis.Ferrous-sulfide sulfur and thiophene remains in char.A combined process of alkali treatment with rapid pyrolysis is introducedwhich has aimed to transform the thermally stable form of organic sulfur toreactive species before pyrolysis. More than 90 % of organic sulfur has beenremoved from a subbituminous coal.
秋田大学の論文