Numerical investigations on gas–solid flow in circulating fluidized bed risers using a new cluster-based drag model (Open Access)--颗粒学报PARTICUOLOGY

Sun, Z., Zhang, C., & Zhu, J. (2022). Numerical investigations on gas–solid flow in circulating fluidized bed risers using a new cluster-based drag model. Particuology, 63, 9-23. https://doi.org/10.1016/j.partic.2021.05.008

Numerical investigations on gas–solid flow in circulating fluidized bed risers using a new cluster-based drag model (Open Access)

Zeneng Sun ^a, Chao Zhang ^b, Jesse Zhu ^a *

a Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, N6A 3K7, Canada
b Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, N6A 3K7, Canada

10.1016/j.partic.2021.05.008

Volume 63, April 2022, Pages 9-23

Received 9 February 2021, Revised 5 May 2021, Accepted 19 May 2021, Available online 10 June 2021, Version of Record 18 November 2021.

E-mail: jzhu@uwo.ca

Highlights

• A cluster-based drag model is proposed for gas–solid CFB riser.

• Cluster properties from experiment were included into the calculation of drag.

• Error analysis on distributions of solids holdup and particle velocity was studied.

• Cluster phenomena between low-density and high-density CFB risers were compared.

• Effect of cluster size on system drag was investigated.

Abstract

A cluster-based drag model is proposed for the gas–solid circulating fluidized bed (CFB) riser by including the cluster information collected from image processing and wavelet analysis into the calculation of system drag. The performance of the proposed drag model is compared with some commonly used drag models. A good agreement with the experimental data is achieved by the proposed cluster-based drag model. Error analysis of the proposed cluster-based drag model based on the local distributions of solids holdup and particle velocity is conducted. The clustering phenomenon in the low-density and high-density CFB risers and the effect of the cluster size on the simulation accuracy are also numerically studied by the proposed drag model.

Graphical abstract

Keywords

Drag model; Clustering effect; Gas–solid flow structures; Circulating fluidized bed

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