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Prediction of solids residence time distribution in cross-flow bubbling fluidized bed
Geng, Shujun1,2; Qian, Yanan1,2; Zhan, Jinhui1; Zhang, Hongling3; Xu, Guangwen1; Liu, Xiaoxing1,2

Cross-flow bubbling fluidized beds (BFBs) have been widely used in dual fluidized bed systems such as chemical and heat looping. Understanding the residence characteristics of solids in such system is important for better design and optimization of reactors. Previously we experimentally measured the residence time distributions (RTDs) of sands in a cross-flow rectangular BFB by using coal particles as tracer. A computational investigation of solids RTD using multi-fluid Eulerian method combined with the species transport equation showed that the RTD of sands could be correctly represented by that of coal particles, and the simulation results well agreed with experimental data. Parametric studies demonstrated that, under the considered operation conditions, the influence of tracer injection time period on the predicted solid residence times was nearly ignorable. Simulation results revealed that in the investigated cross-flow BFB the solids RTD is closely related to solids inventory and solids flux. Through proper data processing, it was found that the descending part of solids RTD profile can be uniquely fitted by an empirical exponential function. A semi-empirical approach was thus developed and further validated, for the first time in the literature, to predict the entire profile of solids RID, in which the ascending part of solids RTD profile is obtained through CFD simulation whereas the descending part is given by the fitted empirical exponential function. (C) 2017 Elsevier B.V. All rights reserved.

KeywordSolids Residence Time Distribution (Rtd) Bubbling Fluidized Bed Computational Fluidized Dynamics (Cfd) Semi-empirical Approach Dual Fluidized Bed
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS KeywordCfd Simulation ; Fine Particles ; Riser ; Gas ; Gasification ; Reactor
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China(21576265)
WOS IDWOS:000411544800060
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Document Type期刊论文
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
3.Southwest Jiaotong Univ, Sch Math, Chengdu 610031, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Geng, Shujun,Qian, Yanan,Zhan, Jinhui,et al. Prediction of solids residence time distribution in cross-flow bubbling fluidized bed[J]. POWDER TECHNOLOGY,2017,320:555-564.
APA Geng, Shujun,Qian, Yanan,Zhan, Jinhui,Zhang, Hongling,Xu, Guangwen,&Liu, Xiaoxing.(2017).Prediction of solids residence time distribution in cross-flow bubbling fluidized bed.POWDER TECHNOLOGY,320,555-564.
MLA Geng, Shujun,et al."Prediction of solids residence time distribution in cross-flow bubbling fluidized bed".POWDER TECHNOLOGY 320(2017):555-564.
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