MATHEMATICAL MODELLING AND SIMULATION OF FCC RISER REACTOR

Abstract

The aim of this study is to develop a one dimensional heterogeneous two phase model for the adiabatic FCC riser reactor assuming a plug flow for both the solid and gaseous phases. The reaction kinetics of the cracking reactions are represented by the four lump kinetic scheme. The hydrodynamics of the riser are considered taking the slip factor into account. The model consisting of ordinary differential equations is solved in order to get the yield patterns and study the effect of process variables like input catalyst temperature, catalyst oil ratio and the feed rate on the yield of gasoline. Another model is developed for the downer reactor using hydrodynamic modelling, mass and energy balances. The model developed is solved using Runge- kutta IV order implemented in MATLAB and the differences in the axial profiles and gasoline yield as compared with the riser reactor are discussed.