Numerical investigation of the penetrating gas flow into particle clusters for circulating fluidized beds

Gas-solid circulating fluidized beds (CFBs) are widely used as reactors in industry with performances heavily relying on the interaction between gas and particles. In a CFB, some particles stay dispersed, while other particles aggregate to form dense and large clusters. As the gas-particle interacti...

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Bibliographic Details
Published in:Powder technology 2021-08, Vol.388, p.442-449
Main Authors: Wei, Xiaoyang, Weber, Justin, Breault, Ronald W.
Format: Article
Language:English
Subjects:
Circulating fluidized bed
Clusters
Design optimization
Discrete element method
Empirical analysis
Fluidized beds
Gas flow
Gas-cluster interaction
Numerical simulation
Particle clusters
Particle interactions
Particle size
Reactors
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Summary:Gas-solid circulating fluidized beds (CFBs) are widely used as reactors in industry with performances heavily relying on the interaction between gas and particles. In a CFB, some particles stay dispersed, while other particles aggregate to form dense and large clusters. As the gas-particle interaction is simple for dispersed particles, the prediction of reactor performances calls for a thorough analysis of the gas-cluster interaction. In the literature, cluster properties have been characterized extensively. However, how the gas interacts with clusters has not been quantified systematically yet. In this work, the gas-cluster interaction was quantified numerically by characterizing the penetrating gas flow into clusters. With 99 simulations, influences of the particle randomness, cluster solids holdup, cluster diameter, particle diameter, superficial gas velocity and fluid properties on the gas-cluster interaction were investigated systematically. Then, an empirical correlation was proposed to quantify the gas-cluster interaction, significantly contributing to the design and optimization of CFBs. [Display omitted] •The gas-particle interaction in CFBs was quantified with 99 simulations.•Gas velocity in the cluster is significantly lower than that outside the cluster.•Magnitudes of penetrating gas flow into clusters was obtained explicitly.•The influences of cluster properties and fluid properties were investigated.•An empirical equation was proposed considering properties of the cluster and gas.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2021.04.046