Numerical investigation of turbulent mass transfer processes in turbulent fluidized bed by computational mass transfer

doi:10.1016/j.cjche.2024.09.009

Chinese Journal of Chemical Engineering ›› 2024, Vol. 76 ›› Issue (12): 64-74.DOI: 10.1016/j.cjche.2024.09.009

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Numerical investigation of turbulent mass transfer processes in turbulent fluidized bed by computational mass transfer

Hailun Ren¹, Liang Zeng², Wenbin Li², Shuyong Chen³, Zhongli Tang⁴, Donghui Zhang⁴

1. Department of Chemical Engineering, Tianjin Renai College, Tianjin 301636, China;
2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
3. Innovation Center for Advanced Glass Materials (Anhui) Co., Ltd, Bengbu, 233000, China;
4. The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2024-07-12 Revised:2024-09-19 Accepted:2024-09-23 Online:2024-10-11 Published:2024-12-28
Contact: Wenbin Li,E-mail:richard@tju.edu.cn
Supported by:
The authors acknowledge the financial support from the National Natural Science Foundation of China (22078230), the National Key Research and Development Program of China (2023YFB4103600) and the State Key Laboratory of Heavy Oil Processing (SKLHOP202202008).

Numerical investigation of turbulent mass transfer processes in turbulent fluidized bed by computational mass transfer

Hailun Ren¹, Liang Zeng², Wenbin Li², Shuyong Chen³, Zhongli Tang⁴, Donghui Zhang⁴

1. Department of Chemical Engineering, Tianjin Renai College, Tianjin 301636, China;
2. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
3. Innovation Center for Advanced Glass Materials (Anhui) Co., Ltd, Bengbu, 233000, China;
4. The Research Center of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

通讯作者: Wenbin Li,E-mail:richard@tju.edu.cn
基金资助:
The authors acknowledge the financial support from the National Natural Science Foundation of China (22078230), the National Key Research and Development Program of China (2023YFB4103600) and the State Key Laboratory of Heavy Oil Processing (SKLHOP202202008).

Abstract

Abstract: Turbulent fluidized bed possesses a distinct advantage over bubbling fluidized bed in high solids contact efficiency and thus exerts great potential in applications to many industrial processes. Simulation for fluidization of fluid catalytic cracking (FCC) particles and the catalytic reaction of ozone decomposition in turbulent fluidized bed is conducted using the Eulerian-Eulerian approach, where the recently developed two-equation turbulent (TET) model is introduced to describe the turbulent mass diffusion. The energy minimization multi-scale (EMMS) drag model and the kinetic theory of granular flow (KTGF) are adopted to describe gas-particles interaction and particle-particle interaction respectively. The TET model features the rigorous closure for the turbulent mass transfer equations and thus enables more reliable simulation. With this model, distributions of ozone concentration and gas-particles two-phase velocity as well as volume fraction are obtained and compared against experimental data. The average absolute relative deviation for the simulated ozone concentration is 9.67% which confirms the validity of the proposed model. Moreover, it is found that the transition velocity from bubbling fluidization to turbulent fluidization for FCC particles is about 0.5 m·s^-1 which is consistent with experimental observation.

Key words: Turbulent fluidized bed, Simulation, Computational mass transfer, Turbulence, Computational fluid dynamics

摘要： Turbulent fluidized bed possesses a distinct advantage over bubbling fluidized bed in high solids contact efficiency and thus exerts great potential in applications to many industrial processes. Simulation for fluidization of fluid catalytic cracking (FCC) particles and the catalytic reaction of ozone decomposition in turbulent fluidized bed is conducted using the Eulerian-Eulerian approach, where the recently developed two-equation turbulent (TET) model is introduced to describe the turbulent mass diffusion. The energy minimization multi-scale (EMMS) drag model and the kinetic theory of granular flow (KTGF) are adopted to describe gas-particles interaction and particle-particle interaction respectively. The TET model features the rigorous closure for the turbulent mass transfer equations and thus enables more reliable simulation. With this model, distributions of ozone concentration and gas-particles two-phase velocity as well as volume fraction are obtained and compared against experimental data. The average absolute relative deviation for the simulated ozone concentration is 9.67% which confirms the validity of the proposed model. Moreover, it is found that the transition velocity from bubbling fluidization to turbulent fluidization for FCC particles is about 0.5 m·s^-1 which is consistent with experimental observation.

关键词: Turbulent fluidized bed, Simulation, Computational mass transfer, Turbulence, Computational fluid dynamics

Hailun Ren, Liang Zeng, Wenbin Li, Shuyong Chen, Zhongli Tang, Donghui Zhang. Numerical investigation of turbulent mass transfer processes in turbulent fluidized bed by computational mass transfer[J]. Chinese Journal of Chemical Engineering, 2024, 76(12): 64-74.

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Numerical investigation of turbulent mass transfer processes in turbulent fluidized bed by computational mass transfer

Numerical investigation of turbulent mass transfer processes in turbulent fluidized bed by computational mass transfer

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