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Steady-state modeling of axial heterogeneity in CFB risers based on one-dimensional EMMS model
Hu, Shanwei; Liu, Xinhua; Li, Jinghai
2013-06-07
Source PublicationCHEMICAL ENGINEERING SCIENCE
ISSN0009-2509
Volume96Issue:0Pages:165-173
AbstractAxial heterogeneity in circulating fluidized bed (CFB) risers is very important to the design of fluidized bed reactors, which is, however, still unable to be described in theory. Based on a successful description of local hydrodynamics in gas solid flow, the Energy-Minimization Multi-Scale (EMMS) theory further relates axial hydrodynamics with local and global stability conditions in the system, providing a theoretical way to account for the axial heterogeneity in CFB risers. This research reveals that the interaction between particle clusters and the dilute phase as well as the surrounding dense phase has a significant effect on their dynamical evolution. Similar to cluster diameter in the EMMS theory, number density of particle clusters serving as a comprehensive indicator to the heterogeneity in gas solid flow is constrained by both local and global stability conditions in the system. With the above cognition, a one-dimensional EMMS model is developed to perform steady-state modeling of the axial heterogeneity in CFB risers. The model successfully reproduces a complete transition zone and the parametric effects on it at the choking condition. The S-shaped axial voidage profile calculated by the one-dimensional EMMS model is in good agreement with the experimental results in gas solid fast fluidization. This research is not only the first step toward implementing the three-scale computation in virtual process engineering (VPE), but also of referential significance to industrial chemical process development. (C) 2013 Elsevier Ltd. All rights reserved.
KeywordMathematical Modeling Hydrodynamics Cluster Choking Multiscale Fluidization
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.ces.2013.04.004
Indexed BySCI
Language英语
WOS KeywordFLOW ; VELOCITY
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000320508200016
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13339
Collection研究所(批量导入)
AffiliationChinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Hu, Shanwei,Liu, Xinhua,Li, Jinghai. Steady-state modeling of axial heterogeneity in CFB risers based on one-dimensional EMMS model[J]. CHEMICAL ENGINEERING SCIENCE,2013,96(0):165-173.
APA Hu, Shanwei,Liu, Xinhua,&Li, Jinghai.(2013).Steady-state modeling of axial heterogeneity in CFB risers based on one-dimensional EMMS model.CHEMICAL ENGINEERING SCIENCE,96(0),165-173.
MLA Hu, Shanwei,et al."Steady-state modeling of axial heterogeneity in CFB risers based on one-dimensional EMMS model".CHEMICAL ENGINEERING SCIENCE 96.0(2013):165-173.
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