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Simulation gas-solid flow in the downer with new structure-based drag model
Chen, Hengzhi1; Gu, Sumin1; Li, Hongzhong2
2018
发表期刊POWDER TECHNOLOGY
ISSN0032-5910
卷号323期号:00页码:163-175
摘要

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.

关键词Circulating Fluidized Bed Downer Drag Model Simulation Multi-scale
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1016/j.powtec.2017.10.015
收录类别SCI
语种英语
关键词[WOS]Circulating Fluidized-bed ; High-density Downer ; Catalytic Cracking ; Eulerian Simulation ; Dynamics Simulation ; Cfd Simulation ; Mass-transfer ; Hydrodynamics ; Reactor ; Riser
WOS研究方向Engineering
WOS类目Engineering, Chemical
项目资助者National Natural Science Foundation of China(51374261 ; 91334109)
WOS记录号WOS:000418975400018
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23469
专题研究所(批量导入)
通讯作者Chen, Hengzhi
作者单位1.Chongqing Univ, Coll Chem & Chem Engn, Chongqing 400044, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
推荐引用方式
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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