摘要
To investigate the performances of rough-cut cyclone in FCC disengager,two-fluid model provided by Fluent 6.2 was used for simulation of the dense phase flow.Agglomeration among particles was calculated by a set of improved gas-solid drag expressions.The results show that separation efficiency of rough-cut cyclone for catalyst reaches 98.48%.The solid concentration influences on the leakage of gases off dipleg are involved in three mechanisms:weakening on the gas swirling motion,dragging forces fundamentally caused by the particle gravitation and the wrapping effects onto the gas.The leakage ratio of the dipleg is 32.17% and it can be reduced to 20.97% by adding a hopper.It is proved that the concentration turning point for pressure drop is a function concerning particle density,viscosity and granular sizes.Pressure drops of rough-cut cyclone calculated by the wall film growth theory have good agreement with numerical simulation results.
To investigate the performances of rough-cut cyclone in FCC disengager,two-fluid model provided by Fluent 6.2 was used for simulation of the dense phase flow.Agglomeration among particles was calculated by a set of improved gas-solid drag expressions.The results show that separation efficiency of rough-cut cyclone for catalyst reaches 98.48%.The solid concentration influences on the leakage of gases off dipleg are involved in three mechanisms:weakening on the gas swirling motion,dragging forces fundamentally caused by the particle gravitation and the wrapping effects onto the gas.The leakage ratio of the dipleg is 32.17% and it can be reduced to 20.97% by adding a hopper.It is proved that the concentration turning point for pressure drop is a function concerning particle density,viscosity and granular sizes.Pressure drops of rough-cut cyclone calculated by the wall film growth theory have good agreement with numerical simulation results.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第9期2448-2453,共6页
CIESC Journal
基金
国家重点基础研究发展计划项目(G2005CB22120103)~~
关键词
催化裂化
粗旋
性能
模拟
fluidized catalytic cracking
rough-cut cyclone
performance
simulation