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Evaluation of multifluid model for heat transfer behavior of binary gas-solid flow in a downer reactor
Shu, Zhan1,2; Wang, Junwu1; Zhou, Quan1,2; Fan, Chuigang1; Li, Songgeng1
2015-09-01
Source PublicationPOWDER TECHNOLOGY
ISSN0032-5910
Volume281Issue:SEPPages:34-48
Abstract

The heat transfer characteristics of different particles during coal pyrolysis process are of fundamental importance in a downer reactor, where hot sand particles often serve as the heat carrier for heating cold coal particles. Despite its urgent practical demands, fundamental studies on this topic were still very limited so far. To this end, this work carded out computational fluid dynamics (CFD) investigations of heat transfer behavior of binary gas-solid flow in a downer reactor using multifluid model. A modified gas-solid drag model and a modified Gunn's gas-solid heat transfer coefficient model were used to address the critical role of particle cluster structure. Furthermore, the effects of constant or temperature-dependent air properties, particle-particle drag force, and particle-particle heat transfer as well as the different choices of kinetic theories of granular flow were systematically evaluated, and then the optimized models were identified. CFD simulations with the optimized models show that CFD simulation has the ability to qualitatively capture the key heat transfer features in downers, based on the fact that a fairly good agreement with the available experimental data in the literature can be obtained and be further improved by taking the specific shape of inlet distributor into account. (C) 2015 Elsevier B.V. All rights reserved.

KeywordFluidization Gas-solid Flow Downer Reactor Multifluid Model Multiphase Flow Heat Transfer
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.powtec.2015.04.055
Indexed BySCI
Language英语
WOS KeywordCIRCULATING FLUIDIZED-BED ; COUNTERCURRENT DOWNER ; EULERIAN SIMULATION ; COAL-GASIFICATION ; ENTRANCE REGION ; MULTIPHASE FLOW ; CFD SIMULATION ; RISER ; DISTRIBUTOR ; PARTICLES
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000356996000006
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19320
Collection多相复杂系统国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Shu, Zhan,Wang, Junwu,Zhou, Quan,et al. Evaluation of multifluid model for heat transfer behavior of binary gas-solid flow in a downer reactor[J]. POWDER TECHNOLOGY,2015,281(SEP):34-48.
APA Shu, Zhan,Wang, Junwu,Zhou, Quan,Fan, Chuigang,&Li, Songgeng.(2015).Evaluation of multifluid model for heat transfer behavior of binary gas-solid flow in a downer reactor.POWDER TECHNOLOGY,281(SEP),34-48.
MLA Shu, Zhan,et al."Evaluation of multifluid model for heat transfer behavior of binary gas-solid flow in a downer reactor".POWDER TECHNOLOGY 281.SEP(2015):34-48.
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