Mixing Characteristics and Bubble Behavior in an Airlift Internal Loop Reactor with Low Aspect Ratio

doi:10.1016/S1004-9541(14)60089-6

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (6): 611-621.DOI: 10.1016/S1004-9541(14)60089-6

• 催化、动力学与反应工程 • 下一篇

Mixing Characteristics and Bubble Behavior in an Airlift Internal Loop Reactor with Low Aspect Ratio

张伟鹏, 雍玉梅, 张广积, 杨超, 毛在砂

Key Laboratory of Green Process and Engineering, National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2012-12-21 修回日期:2013-03-13 出版日期:2014-06-28 发布日期:2014-06-06
通讯作者: YANG Chao
基金资助:
Supported by the National Basic Research Program of China (2012CB224806), the National Science Fund for Distinguished Young Scholars (21025627), and the National Natural Science Foundation of China (21206166, 20990224), the National High Technology Research and Development Program of China (2012AA03A606) and Beijing Natural Science Foundation (2112038).

Mixing Characteristics and Bubble Behavior in an Airlift Internal Loop Reactor with Low Aspect Ratio

ZHANG Weipeng, YONG Yumei, ZHANG Guangji, YANG Chao, MAO Zaisha

Key Laboratory of Green Process and Engineering, National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2012-12-21 Revised:2013-03-13 Online:2014-06-28 Published:2014-06-06
Supported by:
Supported by the National Basic Research Program of China (2012CB224806), the National Science Fund for Distinguished Young Scholars (21025627), and the National Natural Science Foundation of China (21206166, 20990224), the National High Technology Research and Development Program of China (2012AA03A606) and Beijing Natural Science Foundation (2112038).

摘要/Abstract

摘要： The present study summarizes the results of macro- and micro-mixing characteristics in an airlift internal loop reactor with low aspect ratio (H/D≤5) using the electrolytic tracer response technique and the method of parallel competing reactions respectively. The micro-mixing has never been investigated in airlift loop reactors. The dual-tip electrical conductivity probe technique is used for measurement of local bubble behavior in the reactor. The effects of several operating parameters and geometric variables are investigated. It is found that the increase in superficial gas velocity corresponds to the increase in energy input, liquid circulation velocity and shear rate, decreasing the macro-mixing time and segregation index. Moreover, it is shown that top clearance and draft diameter affect flow resistance. However, the bubble redistribution with a screen mesh on the perforated plate distributor for macro-mixing is insignificant. The top region with a high energy dissipation rate is a suitable location for feeding reactants. The analysis of present experimental data provides a valuable insight into the interaction between gas and liquid phases for mixing and improves the understanding of intrinsic roles of hydrodynamics upon the reactor design and operating parameter selection.

关键词: airlift loop reactor, macro-mixing, micro-mixing, bubble behavior, hydrodynamics

Abstract: The present study summarizes the results of macro- and micro-mixing characteristics in an airlift internal loop reactor with low aspect ratio (H/D≤5) using the electrolytic tracer response technique and the method of parallel competing reactions respectively. The micro-mixing has never been investigated in airlift loop reactors. The dual-tip electrical conductivity probe technique is used for measurement of local bubble behavior in the reactor. The effects of several operating parameters and geometric variables are investigated. It is found that the increase in superficial gas velocity corresponds to the increase in energy input, liquid circulation velocity and shear rate, decreasing the macro-mixing time and segregation index. Moreover, it is shown that top clearance and draft diameter affect flow resistance. However, the bubble redistribution with a screen mesh on the perforated plate distributor for macro-mixing is insignificant. The top region with a high energy dissipation rate is a suitable location for feeding reactants. The analysis of present experimental data provides a valuable insight into the interaction between gas and liquid phases for mixing and improves the understanding of intrinsic roles of hydrodynamics upon the reactor design and operating parameter selection.

Key words: airlift loop reactor, macro-mixing, micro-mixing, bubble behavior, hydrodynamics

张伟鹏, 雍玉梅, 张广积, 杨超, 毛在砂. Mixing Characteristics and Bubble Behavior in an Airlift Internal Loop Reactor with Low Aspect Ratio[J]. Chinese Journal of Chemical Engineering, 2014, 22(6): 611-621.

ZHANG Weipeng, YONG Yumei, ZHANG Guangji, YANG Chao, MAO Zaisha . Mixing Characteristics and Bubble Behavior in an Airlift Internal Loop Reactor with Low Aspect Ratio[J]. Chin.J.Chem.Eng., 2014, 22(6): 611-621.

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Mixing Characteristics and Bubble Behavior in an Airlift Internal Loop Reactor with Low Aspect Ratio

Mixing Characteristics and Bubble Behavior in an Airlift Internal Loop Reactor with Low Aspect Ratio

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