A Comparison Between Fluidized And Packed Bed Reactors In Non-Catalytic Gas-Solid Reactions

Abstract:

Mathematical modeling of both fluidized-bed and packed bed reactors has been carried out. In the fluidized bed reactor a two-phase bubbling bed model has been used in order to estimate the interaction between gas bubbles and the dense phase in the bed. Modeling of iron oxide reduction by hydrogen in the packed and fluidized bed reactors was carried out and different behaviors of reactors were compared. The reduction behavior of solid reactants has been expressed by the grain model and computerized programs were developed in MATLAB software for solving the governing equations at conditions of different temperatures and pressures. The behavior of both type of reactors for variations in temperatures, size of the pellets and the inlet gas compositions have been studied and a comparison between the reactors has been carried out. Excellent mixing of reactants in the fluidized bed helps to minimize temperature variations and renders this system attractive for carrying out gas-solid reactions. The fluidized bed reactors show better conversion of reactants in comparison with the packed beds when solid reactants are used in the form of small pellets.

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