CFD simulation of a gas–solid fluidized bed with two vertical jets--颗粒学报PARTICUOLOGY

Pei, P., Zhang, K., Ren, J., Wen, D., & Wu, G. (2010). CFD simulation of a gas–solid fluidized bed with two vertical jets. Particuology, 8(5), 425-432. https://doi.org/10.1016/j.partic.2010.08.001

CFD simulation of a gas–solid fluidized bed with two vertical jets

Pei Pei ^{a b}, Kai Zhang ^{a c *}, Jintian Ren ^a, Dongsheng Wen ^b, Guiying Wu ^a

a State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
b School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
c National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China

10.1016/j.partic.2010.08.001

Volume 8, Issue 5, October 2010, Pages 425-432

Received 27 March 2009, Revised 18 June 2009, Accepted 6 August 2010, Available online 16 September 2010.

E-mail: kzhang@ncepu.edu.cn; kaizhang@cup.edu.cn

Highlights

Abstract

A computational fluid dynamics (CFD) model is used to investigate the hydrodynamics of a gas–solid fluidized bed with two vertical jets. Sand particles with a density of 2660 kg/m³ and a diameter of 5.0 × 10⁻⁴ m are employed as the solid phase. Numerical computation is carried out in a 0.57 m × 1.00 m two-dimensional bed using a commercial CFD code, CFX 4.4, together with user-defined Fortran subroutines. The applicability of the CFD model is validated by predicting the bed pressure drop in a bubbling fluidized bed, and the jet detachment time and equivalent bubble diameter in a fluidized bed with a single jet. Subsequently, the model is used to explore the hydrodynamics of two vertical jets in a fluidized bed. The computational results reveal three flow patterns, isolated, merged and transitional jets, depending on the nozzle separation distance and jet gas velocity and influencing significantly the solid circulation pattern. The jet penetration depth is found to increase with increasing jet gas velocity, and can be predicted reasonably well by the correlations of Hong et al. (2003) for isolated jets and of Yang and Keairns (1979) for interacting jets.

Graphical abstract

Keywords

Gas–solid fluidized bed; Two vertical jets; Fluid dynamics; CFD model

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