Dynamic Change of Sulfur Forms and Desulfurization Accompanied by Pyrolysis of Coal.

Abstract

Focusing on the desulfurization of high-sulfur coal for clean energy processdevelopment, we aimed to amalgamate the separate information relevant toeach field of coal geology and chemistry with chemical reaction engineering intoan integrated concept for efficient and earth-friendly process development incoal utilization.Review was firstly on sedimentological interpretation of the total sulfurcontent and the distribution of sulfur forms in coal, then our early works forestablishment of the sulfur-forms analysis and formulation of a kinetic modelof desulfurization. Following review of the basic aspects of researh, we presentdata by rapid (hydro) pyrolysis, using a free-fall pyrolyzer, which examinedthe efficient performance of desulfurization of organic sulfur. A series ofstudies elucidated that proper selection of the operational conditions was possiblefor an effective means of desulfurizing organic sulfur which was resistivein conventional slow-heating treatments.For the desulfurization process development in general, precise analyticaldata on coal, especially the forms of sulfur, are needed not only from chemicalbut also from geological view point, combined with precise processing data onphysical separation efficiency and pyrolysis which will be related to gasificationand combustion processes to follow.