Gas–liquid mass transfer in the gas–liquid–solid mini fluidized beds--颗粒学报PARTICUOLOGY

Dong, T., Ma, Y., & Liu, M. (2022). Gas–liquid mass transfer in the gas–liquid–solid mini fluidized beds. Particuology, 69, 22-30. https://doi.org/10.1016/j.partic.2021.10.003

Gas–liquid mass transfer in the gas–liquid–solid mini fluidized beds

Tingting Dong ^a, Yongli Ma ^a *, Mingyan Liu ^{a b}

a School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
b State Key Laboratory of Chemical Engineering (Tianjin University), Tianjin University, Tianjin 300350, China

10.1016/j.partic.2021.10.003

Volume 69, October 2022, Pages 22-30

Received 19 August 2021, Revised 1 October 2021, Accepted 5 October 2021, Available online 29 October 2021, Version of Record 16 December 2021.

E-mail: mayl@tju.edu.cn

Highlights

• Gas–liquid mass transfer rule in gas–liquid–solid mini fluidized bed was found.

• Fluidized particles play an important role in enhancing gas–liquid mass transfer.

• Mass transfer trend in gas–liquid–solid mini fluidized bed was reported.

• Mass transfer trend in gas–liquid mini bubble column was reported.

• Mass transfer trend in mini fluidized bed is similar to mini bubble column.

Abstract

The gas–liquid–solid mini fluidized bed (GLSMFB) combines the advantages of fluidized bed and micro-reactor, and meets the requirements for safety and efficiency of green development of process industry. However, there are few studies on its flow performance and no studies on its mass and heat transfer performance. In this paper, the characteristics of gas–liquid mass transfer in a GLSMFB were studied in order to provide basic guidance for the study of GLSMFB reaction performance and application. Using CO₂ absorption by NaOH as the model process, the gas–liquid mass transfer performance of GLSMFB was investigated. The results show that the liquid volumetric mass transfer coefficient and the gas–liquid interfacial area both increase with the increase of the superficial gas velocity within the experimental parameter range under the same given superficial liquid velocity. At the same ratio of superficial gas to liquid velocity, the liquid volumetric mass transfer coefficient increases with the increase of the superficial liquid velocity. Fluidized solid particles strengthen the liquid mass transfer process, and the liquid volumetric mass transfer coefficient is about 13% higher than that of gas–liquid mini bubble column.

Graphical abstract

Keywords

Gas–liquid–solid; Mini fluidized bed; Mass transfer coefficient; Mini bubble column

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