Department of Chemical/Petrochemical Engineering Rivers State University of Science & Technology Port Harcourt, Nigeria

摘要: Dynamic models for the simulation of an industrial Fluid catalytic cracking riser reactor have been developed on the basis of material and energy balance equations. A four-lump kinetic scheme was used to describe the reactions taking place in the riser. The riser is modeled as a one dimensional plug flow reactor without axial dispersion. The models developed were a set of coupled partial differential equations. These were transformed using the method of lines into a set of ordinary differential equations with respect to time using a finite difference approximation of the spatial derivatives. The resulting differential equations were solved using MathLAB Ode solver. The dynamic responses of the open loop riser reactor to changes in the riser inlet temperature, mass flow rate of gas oil and catalyst-to-oil ratio were investigated. The open loop response of the riser temperature to step changes in the feed flow rate, catalyst-to-oil ratio and riser inlet temperature shows an initial oscillation before the attainment of steady state. The dynamics of the riser is very fast, and steady state is attained within 2300 seconds after disturbance.