CFD simulation of solids residence time distribution in a multi-compartment fluidized bed

doi:10.1016/j.cjche.2017.02.010

Chinese Journal of Chemical Engineering ›› 2017, Vol. 25 ›› Issue (12): 1706-1713.DOI: 10.1016/j.cjche.2017.02.010

• 第25届中国过程控制会议专栏 • 上一篇下一篇

CFD simulation of solids residence time distribution in a multi-compartment fluidized bed

Zheng Zou¹, Yunlong Zhao^1,2, Hu Zhao^1,2, Libo Zhang^1,2, Zhaohui Xie¹, Hongzhong Li¹, Qingshan Zhu¹

1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2016-12-15 修回日期:2017-02-21 出版日期:2017-12-28 发布日期:2018-01-18
通讯作者: Hongzhong Li,E-mail address:hzli@ipe.ac.cn.
基金资助:
Supported by the National Natural Science Foundation of China (21406237 and 21325628), and the State Key Development Program for Basic Research of China (2015CB251402).

CFD simulation of solids residence time distribution in a multi-compartment fluidized bed

Zheng Zou¹, Yunlong Zhao^1,2, Hu Zhao^1,2, Libo Zhang^1,2, Zhaohui Xie¹, Hongzhong Li¹, Qingshan Zhu¹

1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-12-15 Revised:2017-02-21 Online:2017-12-28 Published:2018-01-18
Contact: Hongzhong Li,E-mail address:hzli@ipe.ac.cn.
Supported by:
Supported by the National Natural Science Foundation of China (21406237 and 21325628), and the State Key Development Program for Basic Research of China (2015CB251402).

摘要/Abstract

摘要： The present work focuses on a numerical investigation of the solids residence time distribution (RTD) and the fluidized structure of a multi-compartment fluidized bed, in which the flow pattern is proved to be close to plug flow by using computational fluid dynamics (CFD) simulations. With the fluidizing gas velocity or the bed outlet height rising, the solids flow out of bed more quickly with a wider spread of residence time and a larger RTD variance (σ²). It is just the heterogeneous fluidized structure that beingmore prominentwith the bed height increasing induces the widely non-uniform RTD. The division of the individual internal circulation into double ones improves the flow pattern to be close to plug flow.

关键词: RTD, Bed geometry, CFD, Hydrodynamics, Fluidization

Abstract: The present work focuses on a numerical investigation of the solids residence time distribution (RTD) and the fluidized structure of a multi-compartment fluidized bed, in which the flow pattern is proved to be close to plug flow by using computational fluid dynamics (CFD) simulations. With the fluidizing gas velocity or the bed outlet height rising, the solids flow out of bed more quickly with a wider spread of residence time and a larger RTD variance (σ²). It is just the heterogeneous fluidized structure that beingmore prominentwith the bed height increasing induces the widely non-uniform RTD. The division of the individual internal circulation into double ones improves the flow pattern to be close to plug flow.

Key words: RTD, Bed geometry, CFD, Hydrodynamics, Fluidization

Zheng Zou, Yunlong Zhao, Hu Zhao, Libo Zhang, Zhaohui Xie, Hongzhong Li, Qingshan Zhu. CFD simulation of solids residence time distribution in a multi-compartment fluidized bed[J]. Chinese Journal of Chemical Engineering, 2017, 25(12): 1706-1713.

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CFD simulation of solids residence time distribution in a multi-compartment fluidized bed

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