Hydrodynamics and mass transfer characteristics in an internal loop airlift reactor with sieve plates |
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Authors: | Lijia Luo Jingqi Yuan Ping Xie Junwei Sun Wei Guo |
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Affiliation: | 1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310032, China;2. Department of Automation, Shanghai Jiao Tong University, and Key Laboratory of System Control and Information Processing, Ministry of Education of China, Shanghai 200240, China;3. Hebei Welcome Pharmaceutical Co., Ltd., North China Pharmaceutical Company, Shijiazhuang, China |
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Abstract: | Effects of the sieve plate on hydrodynamics and mass transfer in an annulus sparged airlift reactor (0.08 m3, 1.3 m tall, and 0.284 m in diameter) were investigated. It is found that the sieve plate can significantly enhance gas holdup and volumetric mass transfer coefficient. The sieve pore plays an important role in breaking up bubbles. With a given free area ratio, the sieve plate with a larger sieve pore diameter is more efficient in increasing the volumetric mass transfer coefficient. Four different free area ratios between 37% and 73% are tested, and then an optimal free area ratio is determined. The effect of the sieve plate is found to be related to sparger types. The sieve plate leads to a larger increase of volumetric mass transfer coefficient with the O-ring distributor as compared to the 4-orifice nozzle. Empirical correlations and a hydrodynamic model are proposed to predict gas holdup, volumetric mass transfer coefficient and liquid velocity in airlift reactors with sieve plates. |
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Keywords: | Airlift reactor Sieve plate Gas holdup Mass transfer Liquid velocity Empirical correlation |
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