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

doi:10.1016/j.cjche.2015.12.008

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 Zhang^1,2, Zhengming Gao¹, Yating Cai¹, Ziqi Cai¹, Jie Yang¹, Yuyun Bao¹

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 Zhang^1,2, Zhengming Gao¹, Yating Cai¹, Ziqi Cai¹, Jie Yang¹, Yuyun Bao¹

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/Abstract

摘要： The gassed power demand and volumetric mass transfer coefficient (k_Lα) 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+2CBY_N, PDT+2CBY_W, PDT+2WH_D, HEDT+2WH_D and HEDT+2WH_U, respectively. The results show that the relative power demand of HEDT+2WH_U is higher than that of other four impeller combinations under all operating conditions. At low superficial gas velocity (u_G), k_Lα differences among impeller combinations are not obvious. However, when u_G is high, PDT+2WH_D shows the best mass transfer performance and HEDT+2WH_U shows theworstmass transfer performance under all operating conditions. At high u_G 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 k_Lα 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 (k_Lα) 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+2CBY_N, PDT+2CBY_W, PDT+2WH_D, HEDT+2WH_D and HEDT+2WH_U, respectively. The results show that the relative power demand of HEDT+2WH_U is higher than that of other four impeller combinations under all operating conditions. At low superficial gas velocity (u_G), k_Lα differences among impeller combinations are not obvious. However, when u_G is high, PDT+2WH_D shows the best mass transfer performance and HEDT+2WH_U shows theworstmass transfer performance under all operating conditions. At high u_G 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 k_Lα 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

Jinjin Zhang, Zhengming Gao, Yating Cai, Ziqi Cai, Jie Yang, Yuyun Bao. Mass transfer in gas-liquid stirred reactor with various triple-impeller combinations[J]. Chinese Journal of Chemical Engineering, 2016, 24(6): 703-710.

Jinjin Zhang, Zhengming Gao, Yating Cai, Ziqi Cai, Jie Yang, Yuyun Bao. Mass transfer in gas-liquid stirred reactor with various triple-impeller combinations[J]. Chin.J.Chem.Eng., 2016, 24(6): 703-710.

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

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

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