Comparative study of two fluid model and dense discrete phase model for simulations of gas–solid hydrodynamics in circulating fluidized beds--颗粒学报PARTICUOLOGY

Wu, Y., Liu, D., Hu, J., Ma, J., & Chen, X. (2021). Comparative study of two fluid model and dense discrete phase model for simulations of gas–solid hydrodynamics in circulating fluidized beds. Particuology, 55, 108-117. https://doi.org/10.1016/j.partic.2020.05.001

Comparative study of two fluid model and dense discrete phase model for simulations of gas–solid hydrodynamics in circulating fluidized beds

Ying Wu, Daoyin Liu ^*, Jinding Hu, Jiliang Ma, Xiaoping Chen ^*

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment, Southeast University, Nanjing 210096, China

10.1016/j.partic.2020.05.001

Volume 55, April 2021, Pages 108-117

Received 23 March 2020, Revised 11 May 2020, Accepted 19 May 2020, Available online 27 June 2020, Version of Record 3 February 2021.

E-mail: dyliu@seu.edu.cn; xpchen@seu.edu.cn

Highlights

• Gas–solid hydrodynamics in the CFB riser in established by TFM and DDPM.

• Sensitivity analysis of some key parameters in the TFM and DDPM is conducted.

• Comparative study of the two models is quantitatively discussed.

• Simulated results of the two models are validated by experimental data.

Abstract

Computational fluid dynamics (CFD) has become a valuable tool to study the complex gas–solid hydrodynamics in the circulating fluidized bed (CFB). Based on the two fluid model (TFM) under the Eulerian–Eulerian framework and the dense discrete phase model (DDPM) under the Eulerian–Lagrangian framework, this work conducts the comparative study of the gas–solid hydrodynamics in a CFB riser by these two different models. Results show that DDPM could be used to predict gas–solid hydrodynamics in the circulating fluidized bed, and there are differences between TFM and DDPM, especially in the radial distribution profiles of solid phase. Sensitivity analysis results show that the gas–solid drag model exhibits significant effects on the results for both the two models. The specularity coefficient and the restitution coefficient in the TFM, as well as the reflection coefficient and the parcel number in the DDPM, exhibit less impact on the simulated results.

Graphical abstract

Keywords

CFD simulation; Circulating fluidized bed; Gas–solid flow; Two fluid model; Dense discrete phase model

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