Experiments and simulations of gas-solid flow in an airlift loop reactor  

作　　者：Chaoyu Yan Chunxi Lu Yiping Fan Rui Cao Yansheng Liu 

机构地区：[1]State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

出　　处：《Particuology》2011年第2期130-138,共9页颗粒学报（英文版）

基　　金：supports by the National Natural Science Foundation of China(Grant Nos.20806090,20976190and20776155).

摘　　要：The hydrodynamics in a gas-solid airlift loop reactor was investigated systematically using experimental measurements and CFD simulation. In the experiments, the time averaged parameters, such as solid frac- tion and particle velocity, were measured by optical fiber probe. In the simulation, the modified Gidaspow drag model accounting for the interparticles clustering was incorporated into the Eulerian-Eulerian CFD model with particulate-phase kinetic theory. Predicted values of solid fraction and particle velocity were compared with experimental results, validating the drag model and the simulation. The results show that the profiles of particle velocity and solid fraction are uniform in annulus. However, the core-annulus structure appears in other three regions （draft tube region, bottom region and particle diffluence region）, which presents the similar heterogeneous feature of aggregative fluidization usually occurred in nor- mal fiuidized beds. Simulated profiles of particle residence time distribution indicate that the airlift loop reactor should be characterized by near perfect mixing.The hydrodynamics in a gas-solid airlift loop reactor was investigated systematically using experimental measurements and CFD simulation. In the experiments, the time averaged parameters, such as solid frac- tion and particle velocity, were measured by optical fiber probe. In the simulation, the modified Gidaspow drag model accounting for the interparticles clustering was incorporated into the Eulerian-Eulerian CFD model with particulate-phase kinetic theory. Predicted values of solid fraction and particle velocity were compared with experimental results, validating the drag model and the simulation. The results show that the profiles of particle velocity and solid fraction are uniform in annulus. However, the core-annulus structure appears in other three regions （draft tube region, bottom region and particle diffluence region）, which presents the similar heterogeneous feature of aggregative fluidization usually occurred in nor- mal fiuidized beds. Simulated profiles of particle residence time distribution indicate that the airlift loop reactor should be characterized by near perfect mixing.

关 键 词：Airlift loop FeactoFHydrodynamicsGas-solid two phases flowCFDDrag force model 

分 类 号：TU312.3[建筑科学—结构工程] TQ920.5[轻工技术与工程—发酵工程]