SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2016, Vol. 24 ›› Issue (6): 703-710.DOI: 10.1016/j.cjche.2015.12.008

• 第25届中国过程控制会议专栏 • 上一篇    下一篇

Mass transfer in gas-liquid stirred reactor with various triple-impeller combinations

Jinjin Zhang1,2, Zhengming Gao1, Yating Cai1, Ziqi Cai1, Jie Yang1, Yuyun Bao1   

  1. 1 State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2 School of Chemical Engineering, Shandong University of Technology, Zibo 255000, China
  • 收稿日期:2015-02-11 修回日期:2015-06-26 出版日期:2016-06-28 发布日期:2016-07-12
  • 通讯作者: Jie Yang, Yuyun Bao
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21206002, 21376016).

Mass transfer in gas-liquid stirred reactor with various triple-impeller combinations

Jinjin Zhang1,2, Zhengming Gao1, Yating Cai1, Ziqi Cai1, Jie Yang1, Yuyun Bao1   

  1. 1 State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2 School of Chemical Engineering, Shandong University of Technology, Zibo 255000, China
  • Received:2015-02-11 Revised:2015-06-26 Online:2016-06-28 Published:2016-07-12
  • Contact: Jie Yang, Yuyun Bao
  • Supported by:

    Supported by the National Natural Science Foundation of China (21206002, 21376016).

摘要: The gassed power demand and volumetric mass transfer coefficient (kLα) were investigated in a fully baffled, dished-base stirred vessel with a diameter of 0.30 m agitated by five triple-impeller combinations. Six types of impellers (six-half-elliptical-blade disk turbine (HEDT), four-wide-blade hydrofoil impeller (WH) pumping down (D) and pumping up (U), parabolic-blade disk turbine (PDT), and CBY narrow blade (N) and wide blade (W)) were used to form five combinations identified by PDT+2CBYN, PDT+2CBYW, PDT+2WHD, HEDT+2WHD and HEDT+2WHU, respectively. The results show that the relative power demand of HEDT+2WHU is higher than that of other four impeller combinations under all operating conditions. At low superficial gas velocity (uG), kLα differences among impeller combinations are not obvious. However, when uG is high, PDT+2WHD shows the best mass transfer performance and HEDT+2WHU shows theworstmass transfer performance under all operating conditions. At high uG and a given power input, the impeller combinations with high agitation speed and big projection cross-sectional area lead to relatively high values of kLa. Based on the experimental data, the regressed correlations of gassed power number with Froude number and gas flow number, and kLα with power consumption and superficial gas velocity are obtained for five different impeller combinations, which could be used as guidance for industrial design.

关键词: Stirred vessel, Gassed power, Mass transfer, Triple-impeller combination, Gas-liquid system

Abstract: The gassed power demand and volumetric mass transfer coefficient (kLα) were investigated in a fully baffled, dished-base stirred vessel with a diameter of 0.30 m agitated by five triple-impeller combinations. Six types of impellers (six-half-elliptical-blade disk turbine (HEDT), four-wide-blade hydrofoil impeller (WH) pumping down (D) and pumping up (U), parabolic-blade disk turbine (PDT), and CBY narrow blade (N) and wide blade (W)) were used to form five combinations identified by PDT+2CBYN, PDT+2CBYW, PDT+2WHD, HEDT+2WHD and HEDT+2WHU, respectively. The results show that the relative power demand of HEDT+2WHU is higher than that of other four impeller combinations under all operating conditions. At low superficial gas velocity (uG), kLα differences among impeller combinations are not obvious. However, when uG is high, PDT+2WHD shows the best mass transfer performance and HEDT+2WHU shows theworstmass transfer performance under all operating conditions. At high uG and a given power input, the impeller combinations with high agitation speed and big projection cross-sectional area lead to relatively high values of kLa. Based on the experimental data, the regressed correlations of gassed power number with Froude number and gas flow number, and kLα with power consumption and superficial gas velocity are obtained for five different impeller combinations, which could be used as guidance for industrial design.

Key words: Stirred vessel, Gassed power, Mass transfer, Triple-impeller combination, Gas-liquid system