Physical and Chemical Properties of Finely Ground De-Ashed Coal. Final Report April 1984-February 1987

摘要

The report presents the results of a laboratory- and bench-scale program conducted to determine the physical and chemical properties, including gasification reactivity, of three bituminous coals - Pittsburgh No. 8, Illinois No. 6, and Kentucky No. 9. Before testing was initiated, a survey of the chemical and physical coal-cleaniing processes was conducted. Based on the results of this study and a ranking procedure developed, two processes were selected - The Otisca-T process (a physical coal-cleaning process), and the TRW Gravimelt process (a chemical coal-cleaning process) - for evaluating the effects of coal cleaning on the physical and chemical properties of the three coals selected. The physical properties measured included: particle-size distribution, surface area, pore structure, true, particle and bulk densities, and fluidization characteristics. The chemical properties measured were ultimate and proximate analyses, free-swelling index, ash-fusion temperature, ash composition, and coal devolatilization and coal and char gasification characteristics. The coal devolatilization and char gasification characteristics were determined with and without potassium carbonate catalyst. Char gasification kinetic studies were conducted in laboratory scale TGA equipment, and selected coal gasification tests were conducted in continuous bench-scale equipment.