Abstract
Continuous mass versus time data for single coal particles from 5.3 to 9.9 mm with gas temperatures of 900–1200K, Reynolds numbers of 63–126, and oxygen concentrations of 4.5–21 % are presented. Devolatilization and char burn models for millimeter sized particles are formulated and compared with the experimental results. The devolatilization rate is most sensitive to particle size and gas temperature. The char reactivity depends on initial size, Reynolds number, and oxygen concentration. The devolatilization rate agrees with the model of Anthony and Howard when volatile yields are provided from experimental data. The char burning rate follows a diffusion controlled shrinking sphere model when a diffusion screening factor is included.
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