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Two distinctive variational regions of radial particle concentration profiles in circulating fluidized bed risers
Alternative TitlePowder Technol.
Xu, GG; Sun, GG; Nomura, K; Li, JH; Kato, K
1999-01-04
Source PublicationPOWDER TECHNOLOGY
ISSN0032-5910
Volume101Issue:1Pages:91-100
AbstractThe radial profiles of particle concentration in circulating fluidized bed (CFB) risers experience actually a sequential variation as 'uniform (dense)-nonuniform-uniform (dilute), in response to the flow evolution from minimum fluidization to pneumatic transport. Through measuring the lateral distributions of solid concentration in the range epsilon(mf) similar to 1.0 of the cross-sectionally averaged voidage, it was found that the first variational stage, from dense uniform (minimum fluidization) to nonuniform, is completed via the rapid decrease of the particle concentration in the bed core, and the succeeding second stage, from nonuniform to dilute uniform (pneumatic transport), is implemented via the quick decrease of the particle concentration near the bed wall. Based on this observation, general correlations were proposed to predict the local voidages on the bed wall (specifically, at the point where the dimensionless radius is equal to 0.99) and at the bed center, which can be used for the entire spectrum of gas-solid fluidization regimes prevailing in CFB risers. Further analyses demonstrated that such two variational regions are related also to the regime transition and the lateral distribution features of the transient solid concentration fluctuations. (C) 1999 Elsevier Science S.A. All rights reserved.; The radial profiles of particle concentration in circulating fluidized bed (CFB) risers experience actually a sequential variation as 'uniform (dense)-nonuniform-uniform (dilute), in response to the flow evolution from minimum fluidization to pneumatic transport. Through measuring the lateral distributions of solid concentration in the range epsilon(mf) similar to 1.0 of the cross-sectionally averaged voidage, it was found that the first variational stage, from dense uniform (minimum fluidization) to nonuniform, is completed via the rapid decrease of the particle concentration in the bed core, and the succeeding second stage, from nonuniform to dilute uniform (pneumatic transport), is implemented via the quick decrease of the particle concentration near the bed wall. Based on this observation, general correlations were proposed to predict the local voidages on the bed wall (specifically, at the point where the dimensionless radius is equal to 0.99) and at the bed center, which can be used for the entire spectrum of gas-solid fluidization regimes prevailing in CFB risers. Further analyses demonstrated that such two variational regions are related also to the regime transition and the lateral distribution features of the transient solid concentration fluctuations. (C) 1999 Elsevier Science S.A. All rights reserved.
KeywordCirculating Fluidized Beds Radial Distribution Hydrodynamics Particle Concentration Modeling Regime Transition
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
URL查看原文
Indexed BySCI
Language英语
WOS KeywordHEAT-TRANSFER ; GAS ; FLOW ; TURBULENT ; PRESSURE ; FLUCTUATIONS ; BEHAVIOR ; REGIMES
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000077805500010
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6099
Collection研究所(批量导入)
Affiliation1.Gunma Univ, Dept Biol & Chem Engn, Kiryu, Gumma 376, Japan
2.Acad Sinica, Inst Chem Met, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Xu, GG,Sun, GG,Nomura, K,et al. Two distinctive variational regions of radial particle concentration profiles in circulating fluidized bed risers[J]. POWDER TECHNOLOGY,1999,101(1):91-100.
APA Xu, GG,Sun, GG,Nomura, K,Li, JH,&Kato, K.(1999).Two distinctive variational regions of radial particle concentration profiles in circulating fluidized bed risers.POWDER TECHNOLOGY,101(1),91-100.
MLA Xu, GG,et al."Two distinctive variational regions of radial particle concentration profiles in circulating fluidized bed risers".POWDER TECHNOLOGY 101.1(1999):91-100.
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