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Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets
Meng, Zhenliang1,2; Liu, Mengxi1; Ahmad, Nouman2; Wang, Wei2,3; Lu, Chunxi1
2020-08-01
Source PublicationPARTICUOLOGY
ISSN1674-2001
Volume51Pages:120-131
AbstractStandpipes, or downcomers, are commonly used in fluidized beds to transport particles. The outlet structure of the downcomer greatly affects the performance of flow from it and even overall reactor performance. In this study, the hydrodynamics in commercial-scale internally circulating fluidized beds( ICFBs) with central downcomers having different outlet structures was investigated using computational fluid dynamics simulations with an energy minimization multi-scale drag model. The predicted results closely agreed with experimental data. Results showed that in an ICFB with a downcomer outlet directly open to the bed (model A), nearly 12.7% to 5.4% of the gas in the draft tube bypasses into the downcomer. In the ICFB models B and C with a conic baffle below the downcomer, the gas bypass is significantly weakened or even eliminated when the diameter of the conic baffle is 1.1 times that of the downcomer (model C). In addition, the solids circulation mass flux in ICFBs increased by about 62.5%, from 126.8 kg/(m(2)s) in model A to 206 kg/(m(2)s) in model C. (C) 2019 Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.
KeywordInternally circulating fluidized bed Downcomer outlet EMMS CFD Particles flow
DOI10.1016/j.partic.2019.09.007
Language英语
WOS KeywordGAS-PARTICLE FLOW ; CYCLONE DIPLEGS ; MIXING CHARACTERISTICS ; SOLID FLOW ; LOOP-SEAL ; L-VALVE ; SIMULATION ; STANDPIPE ; BEHAVIOR ; OPERATION
Funding ProjectNational Natural Science Foundation of China[91534111] ; National Natural Science Foundation of China[91834302] ; National Natural Science Foundation of China[91834303] ; National Natural Science Foundation of China[21625605] ; National Key Basic Research Project (Program 973) of China[2012CB215000]
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Chemical ; Materials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China ; National Key Basic Research Project (Program 973) of China
WOS IDWOS:000524974900013
PublisherELSEVIER SCIENCE INC
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/40081
Collection中国科学院过程工程研究所
Corresponding AuthorLiu, Mengxi; Wang, Wei
Affiliation1.China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Meng, Zhenliang,Liu, Mengxi,Ahmad, Nouman,et al. Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets[J]. PARTICUOLOGY,2020,51:120-131.
APA Meng, Zhenliang,Liu, Mengxi,Ahmad, Nouman,Wang, Wei,&Lu, Chunxi.(2020).Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets.PARTICUOLOGY,51,120-131.
MLA Meng, Zhenliang,et al."Hydrodynamics in commercial-scale internally circulating fluidized beds with different central downcomer outlets".PARTICUOLOGY 51(2020):120-131.
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