Mechanism analysis of the solids holdup variations in downer reactors based on volumetric flux
Mechanism analysis of the solids holdup variations in downer reactors based on volumetric flux
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基于体积通量的下降反应器固含率变化机理分析
DOI：
10.1016/j.ces.2019.04.045
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发表时间：
2019-09
影响因子：
4.7
通讯作者：
Guan Guoqing
中科院分区：
文献类型：
--
作者：
Lian Wenhao;Pan Xueer;Zheng Shuang;Zhang Wei;Zhang Hui;Fushimi Chihiro;Tsutsumi Atsushi;Hao Xiaogang;Huang Wei;Guan Guoqing
提出了用固体体积通量(VS)代替固体质量通量(Gs)作为循环床固含率的主要影响因素，来研究循环床中固含率的变化，并预测下行床内的极端操作条件。在这项工作中，通过使用来自不同文献的400多组实验数据，在响应面方法(RSM)分析中发现，通过将Gsintov换算为Gsintov，可以避免高估颗粒密度对固含率的影响。进一步的研究表明，不同类型颗粒所引起的固含率差异(ΔεS)随着表观气速(Ug)的减小和Vs的增大而增大。基于归一化拟合结果，对不同因素对固含率的影响进行了表征。结果表明，影响程度的大小顺序为：VS>； Ug>；>； 颗粒尺寸(DP) >； 颗粒密度(ρp)，这为通过调整各种参数来控制固含率以满足下行床内的要求提供了指导，即Vandu可以粗略地调整固含率，而ρp可以微调固含率。同时发现，随着Ug、Dpp和/或ρp的增加，固体体积通量的上限(vs，max)也会增大。此外，本研究还认为，用Vst代替Gst来定义下行床的高密度操作可能更合适。
Solids volumetric flux (Vs), which is expected to replace the solids mass flux (Gs) as the key factor influencing solids holdup in circulating fluidized beds, was proposed to investigate the solids holdup variation and predict the extreme operation conditions in the downers. In this work, by using more than 400 sets of experimental data from different literature in Response Surface Methodology (RSM) analysis, it is found that the overestimation of particle density effect on the solids holdup can be avoided by converting theGsintoVs. Further studies indicated that the difference of solids holdup (Δεs) resulted from the different types of particles increased with the increase inVsas well as the decrease in superficial gas velocity (Ug). Based on the normalized fitting results, the effects of different factors on the solids holdup were characterized. It is concluded that the effect extent was in the order ofVs> Ug>> particle size (dp) > particle density (ρp), which provided a guidance to control the solids holdup to satisfy the requirements in the downer by adjustment of various parameters, that is,VsandUgcan adjust solids holdup roughly whereasdpandρpcan adjust solids holdup finely. Meanwhile, it is found that the upper limit of solids volumetric flux (Vs,max) can be increased by the increase ofUg,dpand/orρp. In addition, it is considered that usingVsto replaceGsto define high-density operation in the downer could be more suitable in this study.
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DOI：
--
发表时间：
2005
期刊：
Journal of Chemical Industry and Engineering
影响因子：
--
作者：
L. Hongzhong
通讯作者：
L. Hongzhong
影响因子：
5.2
作者：
Weizao Liu;K. Luo;Jesse Zhu;J. Beeckmans
通讯作者：
Weizao Liu;K. Luo;Jesse Zhu;J. Beeckmans
DOI：
--
发表时间：
2006
期刊：
The Chinese Journal of Process Engineering
影响因子：
--
作者：
Wang Xie-qing
通讯作者：
Wang Xie-qing
影响因子：
5.2
作者：
C. Fushimi;G. Guan;Y. Nakamura;M. Ishizuka;A. Tsutsumi;S. Matsuda;H. Hatano;Yoshizo Suzuki
通讯作者：
C. Fushimi;G. Guan;Y. Nakamura;M. Ishizuka;A. Tsutsumi;S. Matsuda;H. Hatano;Yoshizo Suzuki
影响因子：
1.6
作者：
Xuqi Song;X. Bi;Y. Bolkan
通讯作者：
Xuqi Song;X. Bi;Y. Bolkan