CAS OpenIR
Solid residence time distribution in a cross-flow dense fluidized bed with baffles
Hua, Leina1; Zhao, Hu1,2; Li, Jun1; Zhu, Qingshan1; Wang, Junwu1
2019-06-08
Source PublicationCHEMICAL ENGINEERING SCIENCE
ISSN0009-2509
Volume200Pages:320-335
AbstractThe residence time distribution (RTD) of particles in a gas-solid dense fluidized bed with a continuous solid flow operation and baffles needs much more focus for the purpose of the wide industrial applications. The available models of solid RTD are not adequate in this case due to the additional convective diffusion induced by the cross-flow of the solid feeding and the complex geometry caused by the baffles. To address this problem, this work applied a two-phase Eulerian-Eulerian model combined with the species transport equation to predict solid RTD in a dense fluidized bed. The effects of the continuous solid feeding and baffles were considered. The solid dispersion coefficient Ds in the species transport equation was calculated by an analytical solution from kinetic theory of granular flow. Ds only needs the value at a molecular level due to the fact that the computational fluid dynamics (CFD) model is able to reproduce the RTD procedure exactly same as the practical experiments. To validate the established CFD model, a series of 3D lab-scale cold flow experiments were conducted in the free and baffled beds for the bed material with various severe non-spherical shapes. The measurement included the solid hydrodynamic characteristics at the outlet of the outflow pipe and solid RTD of the system. The reasonable agreement between the CFD prediction and experimental data demonstrated the good performance of the CFD model. 1D plug flow with dispersion model and the tanks-in-series model were further used to fit the calculated RTD curves. The estimated lateral dispersion coefficient of solids locates in a rational range compared with the data collected extensively from the literature. The results showed that the lateral dispersion coefficient of solids decreases when the baffles are installed. (C) 2019 Elsevier Ltd. All rights reserved.
KeywordCross-flow dense fluidized bed Baffle Non-spherical particle Solid residence time distribution Solid dispersion coefficient Eulerian-Eulerian model
DOI10.1016/j.ces.2019.01.054
Language英语
WOS KeywordCFD SIMULATION ; BULK SOLIDS ; GAS ; PARTICLES ; DISPERSION ; FUEL ; REACTOR ; RISER ; QUANTIFICATION ; COEFFICIENT
Funding ProjectNational Natural Science Foundation of China, China[21306202] ; State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, China[MPCS-2012-A-02] ; National Key R&D Program of China, China[2017YFE0106500]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China, China ; State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, China ; National Key R&D Program of China, China
WOS IDWOS:000461418000028
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/28164
Collection中国科学院过程工程研究所
Corresponding AuthorHua, Leina
Affiliation1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Hua, Leina,Zhao, Hu,Li, Jun,et al. Solid residence time distribution in a cross-flow dense fluidized bed with baffles[J]. CHEMICAL ENGINEERING SCIENCE,2019,200:320-335.
APA Hua, Leina,Zhao, Hu,Li, Jun,Zhu, Qingshan,&Wang, Junwu.(2019).Solid residence time distribution in a cross-flow dense fluidized bed with baffles.CHEMICAL ENGINEERING SCIENCE,200,320-335.
MLA Hua, Leina,et al."Solid residence time distribution in a cross-flow dense fluidized bed with baffles".CHEMICAL ENGINEERING SCIENCE 200(2019):320-335.
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