关键词: 下行床, 催化裂化, 集总动力学, 计算流体力学

Abstract: A mathematical model is developed to predict the two-phase flow and fluid catalytic cracking (FCC) process inside a downer reactor by coupling a turbulent gas-particle multiphase flow model, which describes the flow behavior,with some lumping kinetic models, which simulate the cracking reaction inside the reactor. The model equations are coded and solved by CFX4.3 package, a general computer program for unit simulation involving fluid,heat transfer or chemical reaction. The model can predict some important engineering aspects for a reactor such as solids holdup, interphase slip velocity, pressure drop, acceleration zone for both phases and yields distribution all over the reactor. The predictions reveal that flow behavior is significantly changed when cracking reaction take place inside downer reactors and scale-up of reactors can cause reduction of yield.

Key words: 下行床, 催化裂化, 集总动力学, 计算流体力学