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Title: Numerical study of gas-solid flow behavior in a two-stage high-density riser using EMMS-based drag model
Author: Zhang, Yawen1, 2, 3; Ma, Qiao1, 2, 3; Xu, Xiang1, 2; Xiao, Yunhan1, 2; Lei FuLin(雷福林)1, 2
Source: CHEMICAL ENGINEERING AND PROCESSING
Issued Date: 2015-12-01
Volume: 98, Pages:71-85
Keyword: CFD ; EMMS ; Riser geometry ; Choking ; Dense suspension upflow
DOI: 10.1016/j.cep.2015.10.009
DOC Type: Article
English Abstract: The two-fluid model coupled with the EMMS/Matrix drag model was employed to investigate the gas-solid flow behavior in the novel two-stage high-density riser with an enlarged bottom section. The choking phenomenon in the bottom zone due to the low superficial gas velocity has been predicted. Through the comparison of flow behaviors in the constant-diameter and the novel risers under high solids circulating flux (660 kg/m(2)s), the characteristics of turbulent fluidization was found in the bottom zone, and the dense suspension upflow regime was achieved in the upper zone of the novel riser, but it held much more solids inventory than the typical riser. The larger diameter of the bottom zone made the flow regime transition from fast fluidization to turbulent fluidization, as revealed from probability density distributions. The larger height of the bottom zone extended the horizontal segment of the choking curve. With the increase of the height or the diameter of the bottom zone, it needed more solids inventory to achieve dense suspension upflow in the upper zone, but the solids residence time in the novel riser increased significantly. (C) 2015 Elsevier B.V. All rights reserved.
WOS Headings: Science & Technology ; Technology
WOS Subject: Energy & Fuels ; Engineering, Chemical
WOS Subject Extended: Energy & Fuels ; Engineering
WOS Keyword Plus: CIRCULATING FLUIDIZED-BED ; MULTISCALE CFD SIMULATION ; COAL-GASIFICATION ; KINETIC-THEORY ; TURBULENT FLUIDIZATION ; REGIME ; REACTOR ; PARTICLES ; GASIFIER ; BIOMASS
Indexed Type: SCI
Funder: National High-tech R&D Program of China(2006AA05A103) ; Strategic Priority Research Program of Chinese Academy of Sciences(XDA07050500)
Language: 英语
WOS ID: WOS:000367279000008
Citation statistics:
Content Type: 期刊论文
URI: http://ir.etp.ac.cn/handle/311046/112322
Appears in Collections:中国科学院工程热物理所(论文库)_期刊论文(SCI)

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description.institution: 1.Chinese Acad Sci, Inst Engn Thermophys, Key Lab Adv Energy & Power, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Res Ctr Clean Energy & Power, Lianyungang 222069, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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