Numerical study on hydrodynamics of gas–solids circulating fluidized bed with L-valve--颗粒学报PARTICUOLOGY

Ren, H., Li, W., Zeng, L., Liu, K., Tang, Z., & Zhang, D. (2023). Numerical study on hydrodynamics of gas–solids circulating fluidized bed with L-valve. Particuology, 77, 37-46. https://doi.org/10.1016/j.partic.2022.08.007

Numerical study on hydrodynamics of gas–solids circulating fluidized bed with L-valve

Hailun Ren ^a, Wenbin Li ^b *, Liang Zeng ^b *, Kunlei Liu ^c, Zhongli Tang ^d, Donghui Zhang ^d

a Department of Chemical Engineering, Tianjin Renai College, Tianjin, 301636, China
b School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
c Center for Applied Energy Research, University of Kentucky, Lexington, KY, 40511, United States
d The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

10.1016/j.partic.2022.08.007

Volume 77, June 2023, Pages 37-46

Received 15 June 2022, Revised 4 August 2022, Accepted 10 August 2022, Available online 3 September 2022, Version of Record 2 December 2022.

E-mail: richard@tju.edu.cn; zengl@tju.edu.cn

Highlights

• 3D Full loop simulations are carried out for a CFB with L-valve.

• A satisfactory agreement is found between the simulation and experiment.

• The influences of operating conditions on flow hydrodynamics are studied.

• The phase volume fraction in the CFB riser is characterized and analyzed.

Abstract

L-valve is often used as a non-mechanical valve for the circulation of solids in gas–solids fluidized bed (GSFB) due to its advantages in simple construction and easy control. The information on solids circulation rate as well as the hydrodynamics performance of the CFB with L-valve is of great importance for its better control and design. This paper proposes a Eulerian-Eulerian approach based numerical model integrating the computational fluid dynamics (CFD) with turbulent model, the kinetic theory of granular flow (KTGF) and the drag model, thus the solids circulation rate and the local phase velocity as well as solids volume fraction can be predicted simultaneously. With this model, the hydrodynamics performance of the full loop GSCFB with a L-valve is analyzed in detail. It is found that the drag model affects the simulation significantly and the (energy minimization multiscale) EMMS method shows good performance in the full-loop simulation of GSCFB.

Graphical abstract

Keywords

Gas–solids circulating fluidized bed; L-valve; Computational fluid dynamics; Drag model; Full-loop simulation

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