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Simulation gas-solid flow in the downer with new structure-based drag model
Chen, Hengzhi1; Gu, Sumin1; Li, Hongzhong2
2018
Source PublicationPOWDER TECHNOLOGY
ISSN0032-5910
Volume323Issue:00Pages:163-175
Abstract

To improve the accuracy of simulating the heterogeneous flow in a circulating fluidized bed (CFB) downer, a drag model based on the local structure of the gas-solid flow using the multi-scale method has been developed in this work. New stability conditions according to the characteristics of gas-solid flow in the CFB downer have been derived to solve the non-linear model equations for obtaining structure parameters. New structure-based drag coeffidents were incorporated into the two-fluid model (TFM) to simulate the hydrodynamics of the gas-solid flow in the downer. Simulation results showed that the predictions with the new structure-based drag model are more accurate than those with the Wen-Yu drag model. The predictions with the structure-based drag model showed the heterogeneous flow of the gas-solid flow and the cluster phenomenon. The fluctuation of the instantaneous solid fraction of the experiment can be reasonably reproduced by the simulation using the new structure-based drag model, whereas the fluctuation of the instantaneous-solid fraction cannot be captured by the Wen-Yu drag model. The experimental data showed that the radial profiles of the solid fraction are a typical core-annular structure, and the simulated results with new structure-based drag model agreed well with experimental data from different cases. The axial profiles of the simulated pressure gradient, solid concentration and particles velocity distinctly exhibit the axial structure of the gas-solid flow in the downer, which agreed with the experimental results. (C) 2017 Elsevier B.V. All rights reserved.

KeywordCirculating Fluidized Bed Downer Drag Model Simulation Multi-scale
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.powtec.2017.10.015
Indexed BySCI
Language英语
WOS KeywordCirculating Fluidized-bed ; High-density Downer ; Catalytic Cracking ; Eulerian Simulation ; Dynamics Simulation ; Cfd Simulation ; Mass-transfer ; Hydrodynamics ; Reactor ; Riser
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China(51374261 ; 91334109)
WOS IDWOS:000418975400018
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23469
Collection研究所(批量导入)
Corresponding AuthorChen, Hengzhi
Affiliation1.Chongqing Univ, Coll Chem & Chem Engn, Chongqing 400044, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Chen, Hengzhi,Gu, Sumin,Li, Hongzhong. Simulation gas-solid flow in the downer with new structure-based drag model[J]. POWDER TECHNOLOGY,2018,323(00):163-175.
APA Chen, Hengzhi,Gu, Sumin,&Li, Hongzhong.(2018).Simulation gas-solid flow in the downer with new structure-based drag model.POWDER TECHNOLOGY,323(00),163-175.
MLA Chen, Hengzhi,et al."Simulation gas-solid flow in the downer with new structure-based drag model".POWDER TECHNOLOGY 323.00(2018):163-175.
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