CFD simulation study of the effect of baffles on the fluidized bed for hydrogenation of silicon tetrachloride

doi:10.1016/j.cjche.2021.04.003

Chinese Journal of Chemical Engineering ›› 2022, Vol. 45 ›› Issue (5): 219-228.DOI: 10.1016/j.cjche.2021.04.003

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CFD simulation study of the effect of baffles on the fluidized bed for hydrogenation of silicon tetrachloride

Ning Liu¹, Xingping Liu², Fumin Wang¹, Feng Xin¹, Mingshuai Sun¹, Yi Zhai¹, Xubin Zhang¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2 Xinte Energy Co., Ltd., Urumchi, Xinjiang 830011, China

Received:2021-01-24 Revised:2021-04-11 Online:2022-06-22 Published:2022-05-28
Contact: Xubin Zhang,E-mail:tjzxb@tju.edu.cn
Supported by:
This research was supported by the National Key Research and Development Program ofChina (2018YFB0604900), the National Natural Science Foundation of China (21978198), and the National Key Research and Development Program of China (2016YFF0102503).

CFD simulation study of the effect of baffles on the fluidized bed for hydrogenation of silicon tetrachloride

Ning Liu¹, Xingping Liu², Fumin Wang¹, Feng Xin¹, Mingshuai Sun¹, Yi Zhai¹, Xubin Zhang¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2 Xinte Energy Co., Ltd., Urumchi, Xinjiang 830011, China

通讯作者: Xubin Zhang,E-mail:tjzxb@tju.edu.cn
基金资助:
This research was supported by the National Key Research and Development Program ofChina (2018YFB0604900), the National Natural Science Foundation of China (21978198), and the National Key Research and Development Program of China (2016YFF0102503).

Abstract

Abstract: In this study, the effect of channel baffles and louver baffles on the flow pattern in the large-scale industrial fluidized beds was studied by computational fluid dynamics (CFD) methods. Then, the effect of flow pattern on the chemical reaction performance was studied for the first time. Simulation results showed that the gas velocity distributed more uniformly, solid particles dispersed more homogeneously and aggregation scarcely occurred in the fluidized bed with louver baffles than that with channel baffles. The residence time distribution indicated that louver baffles remarkably suppressed gas back-mixing in comparison with channel baffles. The reasonable agreements of pressure distribution and reaction results between the simulation in the bed with channel baffles and the data on a large-scale industrial apparatus demonstrated the accuracy of the CFD model. The predicted conversion of SiCl₄ in the bed with louver baffles (27.44%) was higher than that with channel baffles (22.69%), indicating that louver baffles markedly improved the performance of the fluidized bed. This study could provide useful information for future structural improvements of baffles in large-scale fluidized beds.

Key words: Fluidized-bed, Baffle, Gas–solids flow, Hydrogenation, Computational fluid dynamics

摘要： In this study, the effect of channel baffles and louver baffles on the flow pattern in the large-scale industrial fluidized beds was studied by computational fluid dynamics (CFD) methods. Then, the effect of flow pattern on the chemical reaction performance was studied for the first time. Simulation results showed that the gas velocity distributed more uniformly, solid particles dispersed more homogeneously and aggregation scarcely occurred in the fluidized bed with louver baffles than that with channel baffles. The residence time distribution indicated that louver baffles remarkably suppressed gas back-mixing in comparison with channel baffles. The reasonable agreements of pressure distribution and reaction results between the simulation in the bed with channel baffles and the data on a large-scale industrial apparatus demonstrated the accuracy of the CFD model. The predicted conversion of SiCl₄ in the bed with louver baffles (27.44%) was higher than that with channel baffles (22.69%), indicating that louver baffles markedly improved the performance of the fluidized bed. This study could provide useful information for future structural improvements of baffles in large-scale fluidized beds.

关键词: Fluidized-bed, Baffle, Gas–solids flow, Hydrogenation, Computational fluid dynamics

Ning Liu, Xingping Liu, Fumin Wang, Feng Xin, Mingshuai Sun, Yi Zhai, Xubin Zhang. CFD simulation study of the effect of baffles on the fluidized bed for hydrogenation of silicon tetrachloride[J]. Chinese Journal of Chemical Engineering, 2022, 45(5): 219-228.

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CFD simulation study of the effect of baffles on the fluidized bed for hydrogenation of silicon tetrachloride

CFD simulation study of the effect of baffles on the fluidized bed for hydrogenation of silicon tetrachloride

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