Modulating the mean residence time difference of wide-size particles in a fluidized bed

doi:10.1016/j.cjche.2017.06.018

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (2): 238-244.DOI: 10.1016/j.cjche.2017.06.018

• Fluid Dynamics and Transport Phenomena • Previous Articles Next Articles

Modulating the mean residence time difference of wide-size particles in a fluidized bed

Hu Zhao^1,2, Jun Li¹, Qingshan Zhu^1,2, Hongzhong Li^1,2

1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-04-21 Revised:2017-06-16 Online:2018-03-16 Published:2018-02-28
Contact: Jun Li, Qingshan Zhu
Supported by:
Supported by the China National Funds for Distinguished Young Scientists (21325628), National Natural Science Foundation of China (91334108) and the State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences (MPCS-2012-A-02 and MPCS-2014-A-03).

Modulating the mean residence time difference of wide-size particles in a fluidized bed

Hu Zhao^1,2, Jun Li¹, Qingshan Zhu^1,2, Hongzhong Li^1,2

1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

通讯作者: Jun Li, Qingshan Zhu
基金资助:
Supported by the China National Funds for Distinguished Young Scientists (21325628), National Natural Science Foundation of China (91334108) and the State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences (MPCS-2012-A-02 and MPCS-2014-A-03).

Abstract

Abstract: For non-catalytic gas-solid reaction, it is desirable to match the mean residence time (MRT) of particles and complete conversion time (t_c) in a fluidized bed. In this study, the MRT differences (MRT ratios) between the coarse particles and the fine particles were investigated in a continuous fluidized bed with a side exit by varying the superficial gas velocity, feed composition and particle size ratio. The results show that the MRT ratio increases firstly and then decreases with increasing the gas velocity. By controlling the gas velocity and the feed composition of coarse particles, the MRT ratio can be modulated from 1.8 to 10.5 at the gas velocity of 1.0 m·s^-1 for the binary mixture with the size ratio of 2.2. The MRT ratio can reach to~12 at the gas velocity of 1.2 m·s^-1 for the particle size ratio of 3.3. The present study has endeavored to obtain fundamental data for an effective plant operation to meet the need of synchronously complete conversion of particles with different sizes during the film diffusion controlling reaction.

Key words: Fluidized bed, Mean residence time, Wide size distribution, Binary mixture

摘要： For non-catalytic gas-solid reaction, it is desirable to match the mean residence time (MRT) of particles and complete conversion time (t_c) in a fluidized bed. In this study, the MRT differences (MRT ratios) between the coarse particles and the fine particles were investigated in a continuous fluidized bed with a side exit by varying the superficial gas velocity, feed composition and particle size ratio. The results show that the MRT ratio increases firstly and then decreases with increasing the gas velocity. By controlling the gas velocity and the feed composition of coarse particles, the MRT ratio can be modulated from 1.8 to 10.5 at the gas velocity of 1.0 m·s^-1 for the binary mixture with the size ratio of 2.2. The MRT ratio can reach to~12 at the gas velocity of 1.2 m·s^-1 for the particle size ratio of 3.3. The present study has endeavored to obtain fundamental data for an effective plant operation to meet the need of synchronously complete conversion of particles with different sizes during the film diffusion controlling reaction.

关键词: Fluidized bed, Mean residence time, Wide size distribution, Binary mixture

Hu Zhao, Jun Li, Qingshan Zhu, Hongzhong Li. Modulating the mean residence time difference of wide-size particles in a fluidized bed[J]. Chin.J.Chem.Eng., 2018, 26(2): 238-244.

Hu Zhao, Jun Li, Qingshan Zhu, Hongzhong Li. Modulating the mean residence time difference of wide-size particles in a fluidized bed[J]. Chinese Journal of Chemical Engineering, 2018, 26(2): 238-244.

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Modulating the mean residence time difference of wide-size particles in a fluidized bed

Modulating the mean residence time difference of wide-size particles in a fluidized bed

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