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Flow behaviors in an external loop airlift reactor
Zhang Tongwang,Wang Tiefeng,Jinfu Wang
Dept Chem Eng, Tsinghua University
*Correspondence author
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Funding: 教育部博士点基金（No.20020003060）
Opened online:24 November 2005
Accepted by: none
Citation: Zhang Tongwang,Wang Tiefeng,Jinfu Wang.Flow behaviors in an external loop airlift reactor[OL]. [24 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3768
 
 
The hydrodynamic behaviors in the heterogeneous flow regime in an external-loop airlift reactor with diameters of riser and down-comer 0.1 m were experimentally studied. The influences of solid concentration, flow resistance of the down-comer and liquid level in the separator were considered with solid volume fraction up to 20 %. The results show that gas holdup and liquid circulation velocity decrease with increasing solid concentration. The gas holdup increases and the liquid circulation velocity decreases with decreasing valve opening and liquid level in the separator. A mathematical model was established based on momentum balance and energy balance, and the axial gas-liquid average slip velocity was obtained which coincides with the slip velocity defined in literatures when the height approaches zero. Comparison between experimental and predicted values shows that the model is reasonable.
Keywords:External loop airlift reactor; Gas holdup; Liquid velocity; Solid concentration; Momentum balance; Energy balance
 
 
 

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