关键词: 管式待生剂分配器, 输送风, 松动风, CPFD模拟, 均匀性

Abstract: Simulation on particle distribution and inner hydrodynamics in the pipe FCC spent catalyst distributor was carried out by using Computational Particle Fluid Dynamics (CPFD) method. The effects of flowrates of transport and fluidizing gases, distributor tilt angle on the heterogeneity index of particle distribution were studied, as well as the effects of flowrates of transport and fluidizing gases on the distribution of gas flow from the outlets and the inner twophase hydrodynamics. The results show that the heterogeneity index of particle distribution can be reduced by increasing the flowrates of transport and fluidizing gases, and the distributor tilt angle, in which the fluidizing gas has less impact than the transport air and distributor tilt angle. There is an optimized tilt angle at which the heterogeneity index reaches a minimum. With increasing of flowrate of transport air, the exit position with the highest particle flux gradually moves towards the end of the distributor, the fraction of gas flow from the middle exits increases, and the fraction of gas flow from the end exits decreases. After introducing fluidizing gas, the differences of solids fluxes at all outlets become smaller, and more gas flow from the outlets near the end of distributor.

Key words: pipe spent catalyst distributor, transport air, fluidizing gas, CPFD simulation, uniformity