Solid residence time distribution in a cross-flow dense fluidized bed with baffles

doi:10.1016/j.ces.2019.01.054

	Solid residence time distribution in a cross-flow dense fluidized bed with baffles
	Hua, Leina 1; Zhao, Hu 1,2; Li, Jun 1; Zhu, Qingshan 1; Wang, Junwu 1
刊名	CHEMICAL ENGINEERING SCIENCE
	2019-06-08
卷号	200 页码:320-335
关键词	Cross-flow dense fluidized bed Baffle Non-spherical particle Solid residence time distribution Solid dispersion coefficient Eulerian-Eulerian model
ISSN号	0009-2509
DOI	10.1016/j.ces.2019.01.054
英文摘要	The 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.
资助项目	National 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关键词	CFD SIMULATION ; BULK SOLIDS ; GAS ; PARTICLES ; DISPERSION ; FUEL ; REACTOR ; RISER ; QUANTIFICATION ; COEFFICIENT
WOS研究方向	Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000461418000028
资助机构	National 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
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/28164]
专题	中国科学院过程工程研究所
通讯作者	Hua, Leina
作者单位	1.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
推荐引用方式 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.