Gas Recirculation Fluidized Bed Thermal Drying of Lignite

摘要

The Prairie Mines & Royalty Ltd. (PMRL)—Bienfait Mine surface mines and calcines a Saskatchewan lignite to produce a lignite char. The market demand for char significantly increased requiring PMRL to increase the throughput capacity of the facility. It was determined that predrying the lignite to 26-28% moisture would decrease the retention time in the calciner and increase the throughput by 30-40%. A Carrier natural gas-fired vibrating fluidized bed thermal coal dryer was constructed in the fall of 2003.