SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 55 ›› Issue (3): 1-12.DOI: 10.1016/j.cjche.2022.05.001

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Impacts of solid physical properties on the performances of a slurry external airlift loop reactor integrating mixing and separation

Tian Zhang1,2, Qingshan Huang2,3,4,5,6, Shujun Geng2,3,4,5,6, Aqiang Chen2,3,4,5,6, Yan Liu1, Haidong Zhang2,3,4,5,6   

  1. 1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China;
    2. Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), Chinese Academy of Sciences (CAS), Qingdao 266101, China;
    3. Dalian National Laboratory for Clean Energy (DNL), Dalian 116023, China;
    4. Innovation Academy for Green Manufacture, Institute of Process Engineering, CAS, Beijing 100190, China;
    5. Synthetic Biology Technology Innovation Center of Shandong Province, Qingdao 266101, China;
    6. Shandong Energy Institute, Qingdao 266101, China
  • Received:2021-12-14 Revised:2022-04-30 Online:2023-06-03 Published:2023-03-28
  • Contact: Yan Liu,E-mail:1998033@hebut.edu.cn;Haidong Zhang,E-mail:zhanghaidong@qibebt.ac.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21878318, 22108285), the DNL Cooperation Fund, CAS (DNL201902), “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) (XDA21060400), Shandong Energy Institute, Single-Cell Center Project (SCZ-16, SCZ-17), and Director Innovation Fund of Synthetic Biology Technology Innovation Center of Shandong Province (sdsynbio-2020-ZH-02).

Impacts of solid physical properties on the performances of a slurry external airlift loop reactor integrating mixing and separation

Tian Zhang1,2, Qingshan Huang2,3,4,5,6, Shujun Geng2,3,4,5,6, Aqiang Chen2,3,4,5,6, Yan Liu1, Haidong Zhang2,3,4,5,6   

  1. 1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China;
    2. Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), Chinese Academy of Sciences (CAS), Qingdao 266101, China;
    3. Dalian National Laboratory for Clean Energy (DNL), Dalian 116023, China;
    4. Innovation Academy for Green Manufacture, Institute of Process Engineering, CAS, Beijing 100190, China;
    5. Synthetic Biology Technology Innovation Center of Shandong Province, Qingdao 266101, China;
    6. Shandong Energy Institute, Qingdao 266101, China
  • 通讯作者: Yan Liu,E-mail:1998033@hebut.edu.cn;Haidong Zhang,E-mail:zhanghaidong@qibebt.ac.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (21878318, 22108285), the DNL Cooperation Fund, CAS (DNL201902), “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) (XDA21060400), Shandong Energy Institute, Single-Cell Center Project (SCZ-16, SCZ-17), and Director Innovation Fund of Synthetic Biology Technology Innovation Center of Shandong Province (sdsynbio-2020-ZH-02).

Abstract: Solid physical properties are vital for the design, optimization, and scale-up of gas–liquid–solid multiphase reactors. The complex and interactional effects of the solid physical properties, including particle diameter, density, wettability, and sphericity, on the hydrodynamic behaviors in a new external airlift loop reactor (EALR) integrating mixing and separation are decoupled in this work. Two semi-empirical equations are proposed and validated to predict the overall gas holdup and liquid circulating velocity satisfactorily, and then the individual influence of such solid physical properties is further investigated. The results demonstrate that both the overall gas holdup in the riser and the liquid circulating velocity in the downcomer increase with the contact angle, but decrease with particle size, density, and sphericity. Additionally, the impact of the particle size on the liquid circulating velocity is also profoundly revealed on a micro-level considering the particle size distribution. Moreover, the axial solid concentration distribution is discussed, and the uniformity of the slurry is described by the mixing index of the solid particles. The results show that a more homogeneous mixture can be achieved by adding finer particles other than attaining violent turbulence. Therefore, this work lays a foundation for the design, scale-up, and industrialization of the EALRs.

Key words: Slurry reactor, Hydrodynamics, Particle, Mixing, Solid physical property

摘要: Solid physical properties are vital for the design, optimization, and scale-up of gas–liquid–solid multiphase reactors. The complex and interactional effects of the solid physical properties, including particle diameter, density, wettability, and sphericity, on the hydrodynamic behaviors in a new external airlift loop reactor (EALR) integrating mixing and separation are decoupled in this work. Two semi-empirical equations are proposed and validated to predict the overall gas holdup and liquid circulating velocity satisfactorily, and then the individual influence of such solid physical properties is further investigated. The results demonstrate that both the overall gas holdup in the riser and the liquid circulating velocity in the downcomer increase with the contact angle, but decrease with particle size, density, and sphericity. Additionally, the impact of the particle size on the liquid circulating velocity is also profoundly revealed on a micro-level considering the particle size distribution. Moreover, the axial solid concentration distribution is discussed, and the uniformity of the slurry is described by the mixing index of the solid particles. The results show that a more homogeneous mixture can be achieved by adding finer particles other than attaining violent turbulence. Therefore, this work lays a foundation for the design, scale-up, and industrialization of the EALRs.

关键词: Slurry reactor, Hydrodynamics, Particle, Mixing, Solid physical property