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Conditioning micro fluidized bed for maximal approach of gas plug flow
Geng, Sulong1,2; Han, Zhennan3; Yue, Junrong1; Li, Yunjia1,2; Zeng, Xi1; Lai, Dengguo1,2; Yu, Jian1; Xu, Guangwen1,3
2018-11-01
发表期刊CHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
卷号351页码:110-118
摘要We have for the first time investigated the gas-solid fluidization behavior in size-reduced beds called micro fluidized bed (Liu. X et al. Chem. Eng. J., 2008, 137: 302-307), but up to now there is not yet any clear definition for the micro fluidized beds (MFBs). This study intends to characterize MFBs in terms of gas back-mixing. The residence time distribution (RTD) and extent of back-mixing of gas were investigated in beds with inner diameters of up to 21 mm for particles of FCC, glass beads and silica sand. The RTD curves of gas, shown as E(t) versus time t, in such beds were determined on the basis of axial dispersion model to obtain the mean residence time (t) over bar, variance sigma(2)(t) and peak height of a given E(t) curve. In terms of these parameters the degree of gas backmixing and its variation were evaluated with respect to particles, bed diameter (D), superficial gas velocity (U-g) and static particle bed height (H-g). It was found that the RTD of gas is subject to a unique correlation between the height of E(t) peak and the variance sigma(2)(t), which makes it clear that the gas flow in an MFB has limited gas dispersion and is highly approaching to a plug flow if sigma(2)(t) is below 0.25 or the height of E(t) peak is larger than 1.0. This refers to the feature that is most desired for an MFB and can thus be the criterion for defining MFB.
关键词Micro fluidized bed Residence time distribution Axial dispersion model Gas back-mixing Plug flow
DOI10.1016/j.cej.2018.06.076
语种英语
关键词[WOS]RESIDENCE-TIME DISTRIBUTION ; AXIAL-DISPERSION ; BUBBLE BEHAVIOR ; HEAT-TRANSFER ; MASS-TRANSFER ; CFD-DEM ; REACTOR ; PHASE ; PARTICLES ; EXPANSION
资助项目National Basic Research Program of China[2014CB744303] ; National Natural Science Foundation of China[91534125]
WOS研究方向Engineering
WOS类目Engineering, Environmental ; Engineering, Chemical
项目资助者National Basic Research Program of China ; National Natural Science Foundation of China
WOS记录号WOS:000444000000013
出版者ELSEVIER SCIENCE SA
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/25943
专题中国科学院过程工程研究所
通讯作者Yu, Jian; Xu, Guangwen
作者单位1.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.Shenyang Univ Chem Technol, Inst Ind Chem & Energy Technol, Shenyang 110142, Liaoning, Peoples R China
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Geng, Sulong,Han, Zhennan,Yue, Junrong,et al. Conditioning micro fluidized bed for maximal approach of gas plug flow[J]. CHEMICAL ENGINEERING JOURNAL,2018,351:110-118.
APA Geng, Sulong.,Han, Zhennan.,Yue, Junrong.,Li, Yunjia.,Zeng, Xi.,...&Xu, Guangwen.(2018).Conditioning micro fluidized bed for maximal approach of gas plug flow.CHEMICAL ENGINEERING JOURNAL,351,110-118.
MLA Geng, Sulong,et al."Conditioning micro fluidized bed for maximal approach of gas plug flow".CHEMICAL ENGINEERING JOURNAL 351(2018):110-118.
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