Abstract

A general criterion is developed for determining whether the selective heating of sulphur-bearing compounds in coal by microwave energy is more effective than conventional heating of the whole sample. Measurements of selective absorption are obtained as a function of microwave frequencies from 1 to 26 GHz. Using very conservative assumptions, it appears that unless absorption by sulphur compounds is 0.8–2.2 dB higher than absorption by other compounds, it is more efficient to use conventional heating techniques.

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