Advanced processes for premium low-rank coal/water fuel production. Annual technical report, April 1, 1987-March 31, 1988 including Quarterly technical progress report, January-March 1988.

摘要

Four coals were identified as good candidates for low-rank coal/water fuel production: Beulah lignite from North Dakota, Jacobs Ranch subbituminous coal from Wyoming, Spring Creek subbituminous coal from Montana, and Usibelli subbituminous coal from Alaska. Pilot-scale fuel preparation capabilities were developed to prepare sizable quantities of low-ash coal/water fuel from low-rank coals for advance combustion applications. This was accomplished using a preparation scheme which included physical and chemical cleaning, hot-water drying, size optimization and, in some cases, the use of additives. Low-rank coal/water fuels were prepared with less than 1.5 wt % ash and energy densities over 8000 Btu/lb, depending on the particle size distribution desired. Bench-and pilot-scale research supported the development of the production scheme. Rheological characterization of the CWF was performed with respect to particle size distribution, additives, and temperature. The effectiveness of process water treatment for the hot-water drying step was investigated. A single-stage activated sludge system was effective in treating process water effluent. 24 refs., 46 figs., 41 tabs. (ERA citation 15:033866)