Abstract
Thermogravimetric analysis was used to compare the reactivity of different coals and chars obtained by partial devolatilization in a drop-tube furnace. The oxidation rate of coals was shown to depend on particle size, rank and maceral composition. For vitrinite-rich coals the increase in oxidation rate, obtained either by devolatilizing or by grinding to below 50 μm, was thought to be due to an increase in surface area accessible to oxygen. Burning profiles of chars prepared from inertinite-rich coal exhibited two peaks clearly showing a significant difference in the oxidation rate of vitrinite and inertinite chars.
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