LOW TEMPERATURE OXIDATION OF LOW RANK COALS. Conference Paper uri icon

abstract

  • The low temperature oxidation of a Montana subbituminous coal was investigated using round bottom 100 ml flasks in constant temperature baths. The experiments were carried out in normal and oxygen enriched air at 30 degree C, 45 degree C, and 70 degree C with particle sizes ranging from 4 mesh to 100 mesh. Periodic analysis of gas samples from the flasks provided the rate data. The reactivity of the as-received coal was compared with that of the same coal dried in high pressure steam, and in hot water. A rate equation is proposed incorporating the effects of oxygen diffusion and surface reaction. For higher oxygen concentration and smaller particle sizes, the zero order surface reaction was found to be controlling. The temperature dependency of the reaction rate was found to be well represented by the Arrhenius equation. The activation energy varied slightly under various conditions between 15 and 20 kcal/g mole. The reactivity of the hot-water-dried coal was found to be similar to that of the as-received coal. Steam dried coal, however, was found to be much less reactive.

published proceedings

  • Proceedings of the Intersociety Energy Conversion Engineering Conference

author list (cited authors)

  • Rahman, M., Hasan, A. R., & Baria, D. N

complete list of authors

  • Rahman, M||Hasan, AR||Baria, DN

publication date

  • January 1, 1985 11:11 AM