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

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 mod...

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Bibliographic Details
Published inParticuology Vol. 9; no. 2; pp. 130 - 138
Main Authors Yan, Chaoyu, Lu, Chunxi, Fan, Yiping, Cao, Rui, Liu, Yansheng
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.04.2011
State Key Laboratory of Heavy Oil Processing,China University of Petroleum, Beijing 102249, China
Subjects
Accounting
Airlift loop reactor
CFD
CFD模型
Computational fluid dynamics
Computer simulation
Drag
Drag force model
Gas–solid two phases flow
Hydrodynamics
Mathematical models
Optical fibers
Reactors
Simulation
固相分数
实验测量
模拟系统
气升式环流反应器
流动
粒子速度
聚类模型
CFD
Airlift loop reactor
Hydrodynamics
Drag force model
Gas–solid two phases flow
Gas-solid two phases flow
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Summary: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.
Bibliography:11-5671/O3
Airlift loop FeactoFHydrodynamicsGas-solid two phases flowCFDDrag force model
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.
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1674-2001
2210-4291
DOI:10.1016/j.partic.2009.10.006