EDS Coal Liquefaction Process Development,Phase III B. Monthly Technical Progress Report,July 1--August 31, 1977.

摘要

The process variable study initiated during Phase IIIA with Wyoming subbituminous coal was resumed in the 50pound-per-day Recycle Coal Liquefaction Unit. The variables investigated were liquefaction residence time and temperature. Studies on the one ton-per-day Coal Liquefaction Pilot Plant continued with Wyoming subbituminous coal to obtain additional yield information at longer residence times than those previously tested. Bituminous coal operators were then resumed to study the effects of increasing the end-point of the solvent. There were no operational problems and there were no apparent yield differences between the standard solvent and the higher end-point solvent. A high molecular weight cationic flocculant effectively settled both Illinois and Wyoming coal fines from a water slurry. This additive may be used in the disposition of coal fines from the 250ton-per-day Exxon Coal Liquefaction Pilot Plant to an existing refinery solids settling pond. Analyses of fines from studies in the Fluidized Bed Unit showed the ash content of the -325mesh material to be consistently greater than 99wt percent. Coke gasification levels varied from 70to 90percent in these studies. The integrated coking gasification unit was prepared for integrated operation on Illinois coal bottoms from CLPP. An engineering evaluation of alternative processes for hydrogen manufacture indicated that the choice of the preferred route is dependent on the value of high BTU gas and the cost of plant fuel gas. (ERA citation 03:009625)