Abstract
Drying characteristics of low rank coals were examined and determined using a pressurized flash drying system which consisted of a pressurized feeder, rolled tubes (maximum of 6m), a cyclone, and a back pressure regulator. The effect of the operating conditions, such as pressure (maximum of 40bar), gas outlet temperature (maximum of 300°C), particle sizes (212–300 and 300–355μm) and residence time (maximum of 1s) on the drying ratio was investigated and analyzed. The study results show that temperature is a more effective factor than pressure. A correlation equation to predict the drying ratio of coals was suggested based on operation conditions.
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