Simulation of FCC catalyst regeneration in a riser regenerator

A comprehensive one-dimensional model was developed in this work for the si mulation of a riser regenerator. The model incorporates the hydrodynamic ch aracteristics of fluidized bed risers and the detailed reaction kinetics of FCC (fluid catalytic cracking) catalyst regeneration and can be used to pr edict the axial profiles of temperature, oxygen concentration and coke cont ent of the catalyst in the riser. The validity of the present model was con firmed by the experimental data from a pilot demonstration unit. Based on t he simulation, effects of solids flow patterns and other parameters includi ng gas velocity, spent and regenerated solids fluxes, temperatures of air a nd spent catalysts as well as carbon content on the spent catalysts have be en systematically examined. The simulation results have provided the necess ary information for the optimal design and operation of a FCC riser regener ator unit, presently in operation in China. (C) 1998 Elsevier Science S.A. All rights reserved.