CFD-DEM simulation of high density particles fluidization behaviors in 3D conical spouted beds--颗粒学报PARTICUOLOGY

Jiang, L., Qiu, M., Liu, R., Liu, B., Shao, Y., & Liu, M. (2024). CFD-DEM simulation of high density particles fluidization behaviors in 3D conical spouted beds. Particuology, 88, 266-281. https://doi.org/10.1016/j.partic.2023.09.018

CFD-DEM simulation of high density particles fluidization behaviors in 3D conical spouted beds

Lin Jiang, Mofan Qiu, Rongzheng Liu, Bing Liu, Youlin Shao, Malin Liu ^*

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2023.09.018

Volume 88, May 2024, Pages 266-281

Received 6 August 2023, Revised 28 September 2023, Accepted 30 September 2023, Available online 20 October 2023, Version of Record 9 November 2023.

E-mail: liumalin@tsinghua.edu.cn

Highlights

• A new fluidization quality index was quantitatively proposed first time.

• Fluidization quality index was found to be highest in the 3D spouted bed when the cone angle is 60°.

• Fluidized gas velocity is increased in a 0.65th power law to keep the spout state with particle density increasing.

• Fluidized gas velocity is increased in a 0.78th power law to keep the entrainment ratio with particle loading increasing.

• Slug flow will appear in fluidizing high density particles with a small cone angle.

Abstract

The spouted bed has been used in the coating process of high-density nuclear fuel particle. The particle fluidization behaviors in pseudo-2D and 3D spouted beds were simulated and validated. The effects of four independent variables (cone angle, particle density, inlet gas velocity, and particle loading) on particle fluidization behaviors in the 3D spouted bed were investigated systematically. The cone angle effect on fluidization mechanism was studied quantitatively first time. A new fluidization quality index was proposed based on the particle entrainment principle, and an extreme value was obtained when the cone angle was 60°, considered to be the optimum value for the 3D conical spouted bed. It was indicated the gas–solid contact efficiency can be kept up if the gas velocity was proportional to ρ_p^0.65 and N_p^0.78 when the particle density or loading was increased. These results will be useful for geometry and operation parameters design of the 3D conical spouted bed and helpful for developing the fluidization mechanism of high-density particles.

Graphical abstract

Keywords

Spouted bed; High-density particle; CFD-DEM; Fluidization quality index; Particle loading

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