Both the theoretical and experimental studies were performed with respect to the fluidized-solids reactors for particles, whose diameters decrease with time in the fluidized bed. Starting from the kinetics of the reaction for one particle, and applying the law of elutriation for the holding time of each particle, the overall reaction kinetics of fluidized bed was studied, and the theoretical quations for the carry-over rate, bed weight and size frequency distribution functions for the bed itself and carry-over were derived.As an example of particles having such characteristics, pitch coke particles with wide size distribution were gasified with air in the fluidized-solids reactor of inner dia. 11cm, and the elutriation velocity constants were correlated as shown in eq. (21)-(23).Then the experimental results were analysed with the theoretical equations, by which the adequacy of these theoretical considerations to express the kinetics in the fluidized bed was proved.Lastly the overall rate coefflcients of gasification were obtained from the experimental data, and the effects of agglomeration of particles or turbulent diffusion in the fluidized bed were discussed, considering the results of the authors' preceding experiments.4)
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Yagi et al. (1955) studied this question.