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The overall objective of this slurry combustion project is to expand scientific and engineering data base on combustion of advanced low-rank coal (LRC) fuels for residential and commercial processes by investigations into operational and environmental effects of burning slurry fuels made with LRC. To accomplish this, specific goals included bench-scale testing of a stationary, packed-bed slurry combustor; construction of a low-rank coal slurry advanced combustion system; testing of the advanced combustion system; and design of an ultra-fine coal-based advanced combustion system. To test different prototype advanced combustion systems, a modular test rig was designed. An induced draft fan, a baghouse, a natural gas reheater, and a computerized data acquisition system were set up. Two different packed-bed slurry combustor prototypes were designed, a stationary and rotating packed bed. The stationary packed bed slurry combustor has been constructed and the rotating packed bed slurry combustor is under construction. 9 refs., 11 figs., 4 tabs. (ERA citation 15:033962)