The Influence of the System for Feedstock Feed in Fluidized Bed Reactors on the Reaction Efficiency with Isoparaffin Dehydrogenation in the Fluidized Aluminochromium Catalyst Bed as an Example

A mathematical model was developed for two units of industrial fluidized bed reactors equipped with different systems for feeding gaseous feedstock: three toroidal rings with nozzles in unit 1, and a false bottom with nozzles distributed through it in unit 2. Analysis of the efficiency (expressed as the yield of the target product – isobutylene) of the units during 4 month operation under industrial conditions demonstrated a higher efficiency of unit 2. The reasons for the differences in the product yields in two units were found using numerical solutions to obtain characteristic patterns of concentration fields of catalyst particles and temperature fields in the units; the results obtained demonstrated more uniform and dense catalyst distribution and more uniform reactorheating characteristics of unit 2. The constructed patterns of main circulative flows of the catalyst accounted for the considerable differences in the catalyst concentration and gas temperature fields. The numerical solutions were used for comparative analysis of the operation efficiencies of the units to show good agreement with the analytic results on industrial reactors. The proposed approach can be used for the design of new and optimization of operating units.

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