Journal
CHINESE JOURNAL OF CHEMICAL ENGINEERING
Volume 26, Issue 6, Pages 1359-1369Publisher
CHEMICAL INDUSTRY PRESS
DOI: 10.1016/j.cjche.2018.03.020
Keywords
Two-stage internal loop airlift reactor; Hydrodynamics; Bubble; Multiphase flow
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Funding
- State Key Laboratory of Chemical Engineering [SKL-ChE-16B01]
- China Postdoctoral Science Foundation [2016M601263]
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Local hydrodynamics of a gas-liquid-solid system, such as bubble circulation regime, gas holdup, liquid velocity and axial profile of solid concentration, are studied in a two-stage internal loop airlift reactor. Empirical correlations for gas holdup and liquid velocity are proposed to ease the reactor design and scale-up. Different bubble circulation regimes were displayed in the first (lower) and second (upper) stages. Increasing superficial gas velocity and solid loading can promote regime transition of the second stage, and the gas holdup of the second stage is higher than that of the lower stage. In addition, the effects of solid loading on bubble behaviour are experimentally investigated for each stage. It is found that bubble size in the downcomer decreases with the presence of solid particles, and bubble size distribution widens under higher superficial gas velocity and lower solid loading. (C) 2018 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
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