Abstract
An Alberta sub-bituminous coal was tested for the level of mercury removal obtained by a low-temperature thermal upgrading. The mercury removal characteristics, relative to increasing temperature and upgrading time, were determined. Rapid thermal upgrading at 400 °C released ∼72% of the mercury in the original coal, with a negligible total thermal energy loss. A corresponding increase in the calorific value of the upgraded coal was observed, from ∼20 900 kJ/kg to 25 900 kJ/kg. A further increase in the upgrading temperature, from 400 °C to 600 °C, produced only a minimal further increase in mercury removal. Rapid thermal upgrading at 400 °C resulted in a higher mercury removal efficiency than the temperature-programmable thermal upgrading. Thermal upgrading of sub-bituminous coal could be considered to be a viable option for mercury emission control. A volume reaction model of a first-order process was applied to simulate mercury removal from coal during the thermal upgrading. A comprehensive time constan...
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