Modeling of segregation in magnetized fluidized bed with binary mixture of Geldart-B magnetizable and nonmagnetizable particles

doi:10.1016/j.cjche.2017.12.011

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (6): 1412-1422.DOI: 10.1016/j.cjche.2017.12.011

• General reactor • 上一篇下一篇

Modeling of segregation in magnetized fluidized bed with binary mixture of Geldart-B magnetizable and nonmagnetizable particles

Quanhong Zhu^1,2, Hongzhong Li¹, Qingshan Zhu^1,3, Qingshan Huang^1,2

1 Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2017-08-30 修回日期:2017-12-28 出版日期:2018-06-28 发布日期:2018-08-03
通讯作者: Hongzhong Li,E-mail address:hzli@ipe.ac.cn;Qingshan Zhu,E-mail address:qszhu@ipe.ac.cn
基金资助:
Supported by the National Natural Science Foundation of China (21325628), the Major Research Plan of the National Natural Science Foundation of China (91334108), and the Scientific Instrument Developing Project of the Chinese Academy of Sciences (YZ201641).

Modeling of segregation in magnetized fluidized bed with binary mixture of Geldart-B magnetizable and nonmagnetizable particles

Quanhong Zhu^1,2, Hongzhong Li¹, Qingshan Zhu^1,3, Qingshan Huang^1,2

1 Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-08-30 Revised:2017-12-28 Online:2018-06-28 Published:2018-08-03
Contact: Hongzhong Li,E-mail address:hzli@ipe.ac.cn;Qingshan Zhu,E-mail address:qszhu@ipe.ac.cn
Supported by:
Supported by the National Natural Science Foundation of China (21325628), the Major Research Plan of the National Natural Science Foundation of China (91334108), and the Scientific Instrument Developing Project of the Chinese Academy of Sciences (YZ201641).

摘要/Abstract

摘要： For the magnetized fluidized bed (MFB) with the binary mixture of Geldart-B magnetizable and nonmagnetizable particles, the magnetically induced segregation between these two kinds of particles occurs at high magnetic field intensities (H), leading to the deterioration of the fluidization quality. The critical intensity (H_ms) above which such segregation commences varies with the gas velocity (U_g). This work focuses on establishing a segregation model to theoretically derive the H_ms-U_g relationship. In a magnetic field, the magnetizable particles form agglomerates. The magnetically induced segregation in essence refers to the size segregation of the binary mixture of agglomerates and nonmagnetizable particles. Consequently, the segregation model was established in two steps:first, the size of agglomerates (d_A) was calculated by the force balance model; then, the H_ms-U_g relationship was obtained by substituting the expression of d_A into the basic size segregation model for binary mixtures. As per the force balance model, the cohesive and collision forces were 1-2 orders of magnitude greater than the other forces exerted on the agglomerates. Therefore, the balance between these two forces largely determined d_A. The calculated d_A increased with increasing H and decreasing U_g, agreeing qualitatively with the experimental observation. The calculated H_ms-U_g relationship agreed reasonably with the experimental data, indicating that the present segregation model could predict well the segregation behavior in the MFB with the binary mixture.

关键词: Magnetized fluidized bed, Binary mixture, Segregation, Model, Agglomerate, Force balance

Abstract: For the magnetized fluidized bed (MFB) with the binary mixture of Geldart-B magnetizable and nonmagnetizable particles, the magnetically induced segregation between these two kinds of particles occurs at high magnetic field intensities (H), leading to the deterioration of the fluidization quality. The critical intensity (H_ms) above which such segregation commences varies with the gas velocity (U_g). This work focuses on establishing a segregation model to theoretically derive the H_ms-U_g relationship. In a magnetic field, the magnetizable particles form agglomerates. The magnetically induced segregation in essence refers to the size segregation of the binary mixture of agglomerates and nonmagnetizable particles. Consequently, the segregation model was established in two steps:first, the size of agglomerates (d_A) was calculated by the force balance model; then, the H_ms-U_g relationship was obtained by substituting the expression of d_A into the basic size segregation model for binary mixtures. As per the force balance model, the cohesive and collision forces were 1-2 orders of magnitude greater than the other forces exerted on the agglomerates. Therefore, the balance between these two forces largely determined d_A. The calculated d_A increased with increasing H and decreasing U_g, agreeing qualitatively with the experimental observation. The calculated H_ms-U_g relationship agreed reasonably with the experimental data, indicating that the present segregation model could predict well the segregation behavior in the MFB with the binary mixture.

Key words: Magnetized fluidized bed, Binary mixture, Segregation, Model, Agglomerate, Force balance

Quanhong Zhu, Hongzhong Li, Qingshan Zhu, Qingshan Huang. Modeling of segregation in magnetized fluidized bed with binary mixture of Geldart-B magnetizable and nonmagnetizable particles[J]. Chinese Journal of Chemical Engineering, 2018, 26(6): 1412-1422.

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Modeling of segregation in magnetized fluidized bed with binary mixture of Geldart-B magnetizable and nonmagnetizable particles

Modeling of segregation in magnetized fluidized bed with binary mixture of Geldart-B magnetizable and nonmagnetizable particles

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