The usage of low grade coals with high moisture content has increased in the world because of its abundance and relatively inexpensiveness. However, technical issues such as pre-drying or dewatering low grade coals should be solved to develop cost competitive systems because advanced systems generally might be operated under high pressure and temperature. In this study, the flash drying characteristics of 2 different types of coals (moisture contents: 14.7wt% and 18.1wt%) were determined in a pressurized micro-riser. The micro-riser consisted of mass flow controller, disk type feeder, rolled tube with oven(tube length: 2m, 4m, 6m), cyclone, back filter and back pressure regulator. The effect of operation conditions, such as pressure(up to 40bar), drying temperature (up to 500<sup>o</sup>C), and residence time (up to 1sec), on drying ratio were investigated. As drying temperature and pressure increased, drying ratios increased from 48% to 100%.

Flash dring characteristics of low grade coal in a pressurized micro-riser

251st National Meeting (2016)

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