SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (5): 1195-1202.DOI: 10.1016/j.cjche.2019.09.013

• Fluid Dynamics and Transport Phenomena •    下一篇

Gas dispersion and solid suspension in a three-phase stirred tank with triple impellers

Hanbin Wang, Zhengming Gao, Bingjie Wang, Yuyun Bao, Ziqi Cai   

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • 收稿日期:2019-04-05 修回日期:2019-09-21 出版日期:2020-05-28 发布日期:2020-07-29
  • 通讯作者: Yuyun Bao, Ziqi Cai
  • 基金资助:
    The authors gratefully acknowledge the financial support from the National Key R&D Program of China (2017YFB0306703), the Fundamental Research Funds for the Central Universities (XK1802-1), and the National Natural Science Foundation of China (No. 21676007).

Gas dispersion and solid suspension in a three-phase stirred tank with triple impellers

Hanbin Wang, Zhengming Gao, Bingjie Wang, Yuyun Bao, Ziqi Cai   

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2019-04-05 Revised:2019-09-21 Online:2020-05-28 Published:2020-07-29
  • Contact: Yuyun Bao, Ziqi Cai
  • Supported by:
    The authors gratefully acknowledge the financial support from the National Key R&D Program of China (2017YFB0306703), the Fundamental Research Funds for the Central Universities (XK1802-1), and the National Natural Science Foundation of China (No. 21676007).

摘要: The hydrodynamics is still not fully understood in the three-phase stirred tank equipped with multi-impeller due to the intensive interaction between phases. In this work, the solid critical suspension speed (NJSG), relative power demand (RPD) and overall gas holdup (εG) were measured in an air-water-glass beads stirred tank equipped with multi-impeller, which consists of a parabolic blade disk turbine below two down-pumping hydrofoils. Results show that either the NJSG or the specific power consumption increases when increasing the volumetric solid concentration or superficial gas velocity. RPD changes less than 10% when solid volumetric concentration ranges from 0 to 15%. εG decreases with the increase of solid concentration, and increases with the increase of both superficial gas velocity and the total specific power consumption. The quantitative correlations of NJSG, RPD and εG were regressed as the function of superficial gas velocity, specific power consumption, Froude number and gas flow number, in order to provide the reference in the design of such three-phase stirred tank with similar multi-impellers.

关键词: Solid suspension, Gas holdup, Gas-liquid-solid system, Stirred reactor

Abstract: The hydrodynamics is still not fully understood in the three-phase stirred tank equipped with multi-impeller due to the intensive interaction between phases. In this work, the solid critical suspension speed (NJSG), relative power demand (RPD) and overall gas holdup (εG) were measured in an air-water-glass beads stirred tank equipped with multi-impeller, which consists of a parabolic blade disk turbine below two down-pumping hydrofoils. Results show that either the NJSG or the specific power consumption increases when increasing the volumetric solid concentration or superficial gas velocity. RPD changes less than 10% when solid volumetric concentration ranges from 0 to 15%. εG decreases with the increase of solid concentration, and increases with the increase of both superficial gas velocity and the total specific power consumption. The quantitative correlations of NJSG, RPD and εG were regressed as the function of superficial gas velocity, specific power consumption, Froude number and gas flow number, in order to provide the reference in the design of such three-phase stirred tank with similar multi-impellers.

Key words: Solid suspension, Gas holdup, Gas-liquid-solid system, Stirred reactor