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Research Paper

Liquid-liquid dispersion characteristics in stirred tanks with different baffles

  • QIN Hua-Long ,
  • GUO Meng-Ke ,
  • GONG Xiang-Yang ,
  • TIAN Yi-Qun ,
  • PENG Chun-Xue ,
  • ZHANG Qing-Hua ,
  • YANG Chao
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  • 1. Hubei Huayu Chemical Co., Ltd., Tianmen, Hubei 431700, China 2. CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 3. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China 4. Hubei Taisheng Chemical Co., Ltd., Yichang, Hubei 443007, China

Received date: 2022-10-25

  Revised date: 2022-12-01

  Online published: 2023-09-01

Abstract

Baffle is an important part of the stirred tank, and it can effectively improve the flow state of fluid and the effective utilization of power in the stirred tank. In order to reduce power consumption and improve mixing performance of the stirred tank, a zigzag punched baffle has been developed in our previous work. However, its performance in a liquid-liquid stirred tank has not been performed. With taking water and kerosene as a research system, the liquid-liquid dispersion characteristics in stirred tanks with standard baffles (SB), standard punched baffles (SPB), and zigzag punched baffles (ZPB) were studied by numerical simulation. The results showed that due to the formation of the impinging steam, the zigzag punched baffle can effectively reduce the dead zone behind the baffle in the stirred tank. With an increase of stirring speed, the stirring power consumption of the three different baffled stirred tanks all gradually increased, meanwhile the kerosene droplet diameter decreased. At the same stirring speed, the power consumption of the SPB stirred tank was almost the same as that of the SB stirred tank, while the gap between ZPB and SB stirred tanks was growing with the increase of stirring speed. The droplet diameter in the stirred tank with zigzag baffle was much smaller than that of the tanks with standard baffle and the standard punched baffle at the same stirring speed. With the increase of stirring speed, the difference between the droplet diameter of ZPB and SPB and that of SB increased first and then decreased. When the stirring speed is 400 r/min, the difference was the largest. At this time, compared with the SB stirred tank, the droplet diameter of kerosene in the SPB and ZPB stirred tanks decreased by 18.16% and 36.87%, respectively.

Cite this article

QIN Hua-Long , GUO Meng-Ke , GONG Xiang-Yang , TIAN Yi-Qun , PENG Chun-Xue , ZHANG Qing-Hua , YANG Chao . Liquid-liquid dispersion characteristics in stirred tanks with different baffles[J]. The Chinese Journal of Process Engineering, 2023 , 23(8) : 1173 -1179 . DOI: 10.12034/j.issn.1009-606X.222397

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