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CFD simulation of the effects of a suspension section on the hydrodynamics of a circulating fluidized bed

文献类型：期刊论文

作者Liu, Cenfan1,2; Zhang, Nan1; Wang, Wei1,3
刊名PARTICUOLOGY
出版日期2019-04-01
卷号43页码:1-8
关键词Computational fluid dynamics Fluidization Meso-scale Energy-minimization multi-scale Suspension section
ISSN号1674-2001
DOI10.1016/j.partic.2018.04.004
英文摘要Gas-solid two-phase flow in a circulating fluidized bed (CFB) is affected by operating conditions (e.g., superficial gas velocity, solids inventory), material properties and geometric factors, such as the entry and exit configuration. In particular, the suspension section, which is located between the riser bottom and the solids recycle inlet, affects the hydrodynamics in the riser significantly. However, the suspension section has received less attention compared with other geometric factors. Most computational fluid dynamics (CFD) simulations, especially two-dimensional simulations do not take this factor into account. We performed three-dimensional, full-loop CFD simulations with a drag coefficient that was determined by the energy-minimization multi-scale model, and investigated the flow behavior of two CFBs with different suspension-section lengths. The simulation results revealed that the axial profiles of voidage in the riser with a longer suspension section are more likely S-shaped, whereas those with shorter suspension sections decay exponentially. The dependences of solids flux on solids inventory differ in the two CFBs. A shorter suspension section may result in a smooth transition from dilute to dense transport without intermediate accumulative choking, whereas a longer suspension section may lead to a choking transition. These simulation results are qualitatively consistent with the flow behaviors described in literature. (C) 2018 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
WOS关键词SOLID RISER FLOWS ; NUMERICAL-SIMULATION ; EXIT GEOMETRY ; PART II ; MODEL ; LOOP ; OPERATION ; PATTERNS ; CHOKING ; DENSITY
资助项目National Natural Science Foundation of China[21625605] ; National Natural Science Foundation of China[21821005] ; Science and Technology project of AQSIQ[2016QK196]
WOS研究方向Engineering ; Materials Science
语种英语
WOS记录号WOS:000460715600001
出版者ELSEVIER SCIENCE INC
资助机构National Natural Science Foundation of China ; Science and Technology project of AQSIQ
源URL[http://ir.ipe.ac.cn/handle/122111/28269]  
专题中国科学院过程工程研究所
通讯作者Wang, Wei
作者单位1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.China Special Equipment Inspect & Res Inst, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Cenfan,Zhang, Nan,Wang, Wei. CFD simulation of the effects of a suspension section on the hydrodynamics of a circulating fluidized bed[J]. PARTICUOLOGY,2019,43:1-8.
APA Liu, Cenfan,Zhang, Nan,&Wang, Wei.(2019).CFD simulation of the effects of a suspension section on the hydrodynamics of a circulating fluidized bed.PARTICUOLOGY,43,1-8.
MLA Liu, Cenfan,et al."CFD simulation of the effects of a suspension section on the hydrodynamics of a circulating fluidized bed".PARTICUOLOGY 43(2019):1-8.

入库方式： OAI收割

来源：过程工程研究所

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