CFD MODELING AND SIMULATION OF FCC RISER

Abstract

Fluid catalytic cracking (FCC) is one of the most important processes for the conversion of gas oil to gasoline. This report is an attempt to model the phenomenon theoretically using commercial computational fluid dynamics software (Fluent 6.3) and 4-lump kinetic model. The geometry, boundary conditions and dimensions of an industrial riser for catalytic cracking unit is conferred for 2D simulation using commercial CFD code. The 2D mesh has been generate using Gambit 2.3. Continuity, momentum, energy and species transport equations, applicable to two phase solid and gas flow, are used to simulate the physical phenomenon efficiently. The approach mentioned in this report uses the granular Eulerian multiphase model with k–ε turbulence and species transport. Time accurate transient problem is solved with the prediction of mass fraction profiles of gas oil, gasoline, light gas and coke. The output curves demonstrate the mass fraction and distribution of temperature in both phases