Numerical Simulation on Effect of Wall Boundary Condition on Gas-Solid Flow in FCC Particles Turbulent Bed
1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China; 2. Petrochemical Research Institute, PetroChina Company Limited, Beijing 100195, China
Abstract The two-fluid model incorporating granular kinetic theory was applied to simulate the gas-solid flow in FCC particles turbulent bed, and to investigate the effect of solid phase wall boundary condition on the predicted gas-solid flow behavior. The results showed that when the Johnson-Jackson boundary condition was used to describe the interaction between wall and particles, the specularity coefficient had a pronounced influence on flow behavior, while the particle-wall restitution coefficient played a minor role. The comparison of simulated results with experimental data indicated that the specularity coefficient of 0.001 was opportune to describe the interaction between wall and particles. For the turbulent fluidization bed with baffles, the introduction of baffles increased the wall area, leading to a strong interaction between wall and particles. When the partial-slip wall condition was used to deal with the wall of baffles, the predicted quantity of particles which passed through the baffles was more than that when the no-slip wall condition was used. The characteristic of baffles wall had some impact on its role played in fluidization beds.
Lu Jingman1,2,Lan Xingying1 et al. Numerical Simulation on Effect of Wall Boundary Condition on Gas-Solid Flow in FCC Particles Turbulent Bed[J]. 化学反应工程与工艺, 2014, 30(1): 57-62.
Lu Jingman1,2,Lan Xingying1 et al. Numerical Simulation on Effect of Wall Boundary Condition on Gas-Solid Flow in FCC Particles Turbulent Bed[J]. 化学反应工程与工艺, 2014, 30(1): 57-62.
