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Influence of Sparger Type on Mass Transfer in a Pilot-Scale Internal Loop Airlift Reactor. Processes (Basel) 2022. [DOI: 10.3390/pr10020429] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
In a pilot-scale internal loop airlift reactor with a height of 5.5 m and a main column diameter of 0.484 m, the influence of three gas sparger structures (ladder distributor, tri-nozzle sparger and perforated plate) on the volumetric mass transfer coefficient kLa was investigated. It was found that the perforated plate produces the highest gas holdup difference and circulating liquid velocity between the riser and the downcomer. The perforated plate provides the most efficient mass transfer due to the more uniform gas distribution and higher circulating liquid velocity, followed by the ladder distributor and tri-nozzle spargers. Compared with the tri-nozzle sparger, the perforated plate increases the value of kLa by up to 16% at a superficial velocity of 0.15 m/s. Interestingly, the analysis of the liquid-phase mass transfer coefficient kL and specific area a with respect to gas velocity shows that the mass transfer rate is primarily controlled by a. By comparing the predictions of different mass transfer models, the slip velocity model based on penetration theory yields a satisfactory agreement with the experimental results within ±15% error. Meanwhile, empirical correlations regarding gas holdup and kLa were developed and were found to have good consistency with experimental values.
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Chen J, Meng C, Wang S, Song X. Gas-Solid Flow in an Airlift Loop Reactor: A Cluster Structure-Dependent Drag Model. Chem Eng Technol 2017. [DOI: 10.1002/ceat.201600104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Juhui Chen
- Harbin University of Science and Technology; School of Mechanical Engineering; 150080 Harbin China
| | - Cheng Meng
- Harbin University of Science and Technology; School of Mechanical Engineering; 150080 Harbin China
| | - Shuai Wang
- Harbin Institute of Technology; School of Energy Science and Engineering; 150001 Harbin China
| | - Xiaojiao Song
- Harbin Institute of Technology; School of Energy Science and Engineering; 150001 Harbin China
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Characterization and Modeling of Oxygen Transfer in a Spouted-Bed Reactor with Auxiliary Aeration. Chem Eng Technol 2017. [DOI: 10.1002/ceat.201600100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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