Particle collision behavior and heat transfer performance in a Na2SO4 circulating fluidized bed evaporator

doi:10.1016/j.cjche.2021.06.005

中国化学工程学报 ›› 2022, Vol. 46 ›› Issue (6): 40-52.DOI: 10.1016/j.cjche.2021.06.005

Particle collision behavior and heat transfer performance in a Na₂SO₄ circulating fluidized bed evaporator

Feng Jiang^1,2, Di Xu¹, Ruijia Li¹, Guopeng Qi³, Xiulun Li¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2 Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin University, Tianjin 300350, China;
3 School of Biological and Environmental Engineering, Tianjin Vocational Institute, Tianjin 300410, China

收稿日期:2021-03-06 修回日期:2021-06-10 出版日期:2022-06-28 发布日期:2022-07-20
通讯作者: Feng Jiang,E-mail:jiangfeng@tju.edu.cn
基金资助:
This work is supported by the open foundation of State Key Laboratory of Chemical Engineering (SKL-ChE-18B03) and by the Municipal Science and Technology Commission of Tianjin, China under Contract No. 2009ZCKFGX01900.

Particle collision behavior and heat transfer performance in a Na₂SO₄ circulating fluidized bed evaporator

Feng Jiang^1,2, Di Xu¹, Ruijia Li¹, Guopeng Qi³, Xiulun Li¹

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2 Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin University, Tianjin 300350, China;
3 School of Biological and Environmental Engineering, Tianjin Vocational Institute, Tianjin 300410, China

Received:2021-03-06 Revised:2021-06-10 Online:2022-06-28 Published:2022-07-20
Contact: Feng Jiang,E-mail:jiangfeng@tju.edu.cn
Supported by:
This work is supported by the open foundation of State Key Laboratory of Chemical Engineering (SKL-ChE-18B03) and by the Municipal Science and Technology Commission of Tianjin, China under Contract No. 2009ZCKFGX01900.

摘要/Abstract

摘要： The particle collision behavior and heat transfer performance are investigated to reveal the heat transfer enhancement and fouling prevention mechanism in a Na₂SO₄ circulating fluidized bed evaporator. The particle collision signals are analyzed with standard deviation by varying the amount of added particles ε (1%–3%), circulation flow velocity u (0.37–1.78 m·s^-1), and heat flux q (7.29–12.14 kW·m^-2). The results show that the enhancement factor reach up to 14.6% by adding polytetrafluoroethylene particles at ε = 3%, u = 1.78 m·s^-1, and q = 7.29 kW·m^-2. Both the standard deviation of the particle collision signal and enhancement factor increase with the increase in the amount of added particles. The standard deviation increases with the increase in circulation flow velocity; however, the enhancement factor initially decreases and then increases. The standard deviation slightly decreases with the increase in heat flux at low circulation flow velocity, but initially increases and then decreases at high circulation flow velocity. The enhancement factor decreases with the increase in heat flux. The enhancement factor in Na₂SO₄ solution is superior to that in water at high amount of added particles. The empirical correlation for heat transfer is established, and the model results agree well with the experimental data.

关键词: Heat transfer enhancement, Particle collision behavior, Circulating fluidized bed, Evaporation, Na₂SO₄, Standard deviation

Abstract: The particle collision behavior and heat transfer performance are investigated to reveal the heat transfer enhancement and fouling prevention mechanism in a Na₂SO₄ circulating fluidized bed evaporator. The particle collision signals are analyzed with standard deviation by varying the amount of added particles ε (1%–3%), circulation flow velocity u (0.37–1.78 m·s^-1), and heat flux q (7.29–12.14 kW·m^-2). The results show that the enhancement factor reach up to 14.6% by adding polytetrafluoroethylene particles at ε = 3%, u = 1.78 m·s^-1, and q = 7.29 kW·m^-2. Both the standard deviation of the particle collision signal and enhancement factor increase with the increase in the amount of added particles. The standard deviation increases with the increase in circulation flow velocity; however, the enhancement factor initially decreases and then increases. The standard deviation slightly decreases with the increase in heat flux at low circulation flow velocity, but initially increases and then decreases at high circulation flow velocity. The enhancement factor decreases with the increase in heat flux. The enhancement factor in Na₂SO₄ solution is superior to that in water at high amount of added particles. The empirical correlation for heat transfer is established, and the model results agree well with the experimental data.

Key words: Heat transfer enhancement, Particle collision behavior, Circulating fluidized bed, Evaporation, Na₂SO₄, Standard deviation

Feng Jiang, Di Xu, Ruijia Li, Guopeng Qi, Xiulun Li. Particle collision behavior and heat transfer performance in a Na₂SO₄ circulating fluidized bed evaporator[J]. 中国化学工程学报, 2022, 46(6): 40-52.

Feng Jiang, Di Xu, Ruijia Li, Guopeng Qi, Xiulun Li. Particle collision behavior and heat transfer performance in a Na₂SO₄ circulating fluidized bed evaporator[J]. Chinese Journal of Chemical Engineering, 2022, 46(6): 40-52.

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Particle collision behavior and heat transfer performance in a Na₂SO₄ circulating fluidized bed evaporator

Particle collision behavior and heat transfer performance in a Na₂SO₄ circulating fluidized bed evaporator

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