SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (2): 247-256.DOI: 10.1016/j.cjche.2018.05.019

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

Drawdown mechanism of light particles in baffled stirred tank for the KR desulphurization process

Meng Li1, Yangbo Tan1, Jianglong Sun1,2,3, De Xie1,2,3, Zeng Liu1,2,3   

  1. 1 School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
    2 Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China;
    3 Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics (HUST), Wuhan 430074, China
  • 收稿日期:2018-02-02 修回日期:2018-05-02 出版日期:2019-02-28 发布日期:2019-03-18
  • 通讯作者: Zeng Liu
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51474109, 51609090, 51679097), and the Science Research Project of Huazhong University of Science and Technology (0118140077, 2006140115)

Drawdown mechanism of light particles in baffled stirred tank for the KR desulphurization process

Meng Li1, Yangbo Tan1, Jianglong Sun1,2,3, De Xie1,2,3, Zeng Liu1,2,3   

  1. 1 School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
    2 Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China;
    3 Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics (HUST), Wuhan 430074, China
  • Received:2018-02-02 Revised:2018-05-02 Online:2019-02-28 Published:2019-03-18
  • Contact: Zeng Liu
  • Supported by:

    Supported by the National Natural Science Foundation of China (51474109, 51609090, 51679097), and the Science Research Project of Huazhong University of Science and Technology (0118140077, 2006140115)

摘要: To improve the efficiency of the desulfurization process, the drawdown mechanism of light particles in stirred tank is studied in this paper. For both up and down pumping modes, the just drawdown speeds (Njd) of floating particles in transformative Kanbara Reactor (KR) are measured in one and four baffled stirred tanks experimentally. Then numerical simulations with standard k-ε model coupled with volume of fluid model (VOF) and discrete phase model (DPM) are conducted to analyze the flow field at the just drawdown speed Njd. The torques on the impeller obtained from experiments and simulations agree well with each other, which indicates the validity of our numerical simulations. Based on the simulations, three main drawdown mechanisms for floating particles, the axial circulation, turbulent fluctuation and largescale eddies, are analyzed. It's found that the axial circulation dominates the drawdown process at small submergence (S=1/4T and 1/3T) and the large-scale eddies play a major role at large submergence (S=2/3T and 3/4T). Besides, the turbulent fluctuation affects the drawdown process significantly for up pumping mode at small submergence (S=1/4T and 1/3T) and for down pumping mode at large submergence (S=2/3T and 3/4T). This paper helps to provide a more comprehensive understanding of the KR desulphurizer drawdown process in the baffled stirred tank.

关键词: Light particles, Drawdown mechanism, Baffled stirred tank, Submergence, Numerical simulations, KR impeller

Abstract: To improve the efficiency of the desulfurization process, the drawdown mechanism of light particles in stirred tank is studied in this paper. For both up and down pumping modes, the just drawdown speeds (Njd) of floating particles in transformative Kanbara Reactor (KR) are measured in one and four baffled stirred tanks experimentally. Then numerical simulations with standard k-ε model coupled with volume of fluid model (VOF) and discrete phase model (DPM) are conducted to analyze the flow field at the just drawdown speed Njd. The torques on the impeller obtained from experiments and simulations agree well with each other, which indicates the validity of our numerical simulations. Based on the simulations, three main drawdown mechanisms for floating particles, the axial circulation, turbulent fluctuation and largescale eddies, are analyzed. It's found that the axial circulation dominates the drawdown process at small submergence (S=1/4T and 1/3T) and the large-scale eddies play a major role at large submergence (S=2/3T and 3/4T). Besides, the turbulent fluctuation affects the drawdown process significantly for up pumping mode at small submergence (S=1/4T and 1/3T) and for down pumping mode at large submergence (S=2/3T and 3/4T). This paper helps to provide a more comprehensive understanding of the KR desulphurizer drawdown process in the baffled stirred tank.

Key words: Light particles, Drawdown mechanism, Baffled stirred tank, Submergence, Numerical simulations, KR impeller