In this study, the flash carbonization data obtained from reactor at Morgantown Energy Technology Center (METC) are analyzed to develop rate expressions. The heat transfer characteristics and hydrodynamics of the carbonizer have been simulated. The result indicates that the solid particle temperature is controlled by the radiation during the period immediately after coal particles are fed into the reactor. The temperature of the gas at the region subsequent to the entry region is controlled by the convection between the solids and the gas. Both the solid temperature and the gas temperature seem to increase rapidly due to the radiation from the reactor wall which has high temperature. In regard to the rate expression for coal carbonization, the rate equation based on Wen et al. fit the data better than that based on Badzioch and Hawksley. However, neither expression predicts the effect of pressure since both of them are derived based on the atmospheric condition. In addition two rate expressions were formulated to account for the pressure effect and were tested against the data from METC as well as against two other sets of published data. The results indicated that these expressions could predict the trends of the data, but theremore » were still discrepancies from the experimental data. Hence more accurate data taken under better controlled operating conditions are necessary in order to develop a better rate expression for flash carbonization of coal. 16 references, 18 figures, 7 tables.« less
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