Numerical simulation and experimental validation of gas–solid flow in the riser of a dense fluidized bed reactor--颗粒学报PARTICUOLOGY

Wang, X., Jiang, F., Xu, X., Wang, S., Wu, X., Fan, B., Liao, L., Wang, J., & Xiao, Y. (2009). Numerical simulation and experimental validation of gas–solid flow in the riser of a dense fluidized bed reactor. Particuology, 7(4), 278–282. https://doi.org/10.1016/j.partic.2009.03.009

Numerical simulation and experimental validation of gas–solid flow in the riser of a dense fluidized bed reactor

Xueyao Wang, Fan Jiang, Xiang Xu, Shengdian Wang, Xuezhi Wu, Baoguo Fan, Liangliang Liao, Jiachang Wang, Yunhan Xiao^*

Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

10.1016/j.partic.2009.03.009

Volume 7, Issue 4, August 2009, Pages 278-282

Received 27 October 2008, Accepted 24 March 2009, Available online 18 July 2009.

E-mail: xiao_yh@mail.etp.ac.cn

Highlights

Abstract

Gas–solid flow in the riser of a dense fluidized bed using Geldart B particles (sand), at high gas velocity (7.6–15.5 m/s) and with comparatively high solid flux (140–333.8 kg/m² s), was investigated experimentally and simulated by computational fluid dynamics (CFD), both two- and three-dimensional and using the Gidaspow, O’Brien-Syamlal, Koch-Hill-Ladd and EMMS drag models. The results predicted by EMMS drag model showed the best agreement with experimental results. Calculated axial solids hold-up profiles, in particular, are well consistent with experimental data. The flow structure in the riser was well represented by the CFD results, which also indicated the cause of cluster formation. Complex hydrodynamical behaviors of particle cluster were observed. The relative motion between gas and solid phases and axial heterogeneity in the three subzones of the riser were also investigated, and were found to be consistent with predicted flow structure. The model could well depict the difference between the two exit configurations used, viz., semi-bend smooth exit and T-shaped abrupt exit. The numerical results indicate that the proposed EMMS method gives better agreement with the experimental results as compared with the Gidaspow, O’Brien-Syamlal, Koch-Hill-Ladd models. As a result, the proposed drag force model can be used as an efficient approach for the dense gas–solid two-phase flow.

Graphical abstract

Keywords

Gas–solid flow; Drag model; EMMS; Exit configuration

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