Numerical simulation of flow field and residence time of nanoparticles in a 1000-ton industrial multi-jet combustion reactor

doi:10.1016/j.cjche.2021.12.008

Chinese Journal of Chemical Engineering ›› 2022, Vol. 51 ›› Issue (11): 86-99.DOI: 10.1016/j.cjche.2021.12.008

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Numerical simulation of flow field and residence time of nanoparticles in a 1000-ton industrial multi-jet combustion reactor

Jie Ju¹, Xianjian Duan², Bismark Sarkodie¹, Yanjie Hu¹, Hao Jiang¹, Chunzhong Li¹

1. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. Guangzhou Huifu Research Institute Co. Ltd., Guangzhou 510665, China

Received:2021-09-12 Revised:2021-12-08 Online:2023-01-18 Published:2022-11-18
Contact: Yanjie Hu,E-mail:huyanjie@ecust.edu.cn;Chunzhong Li,E-mail:czli@ecust.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (21978088, 91534202, 51673063), Shanghai Technology Research Leader (20XD1433600), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutes of High Learning, the Basic Research Program of Shanghai (17JC1402300), the Shanghai City Board of education research and innovation project, and the Fundamental Research Funds for the Central Universities (222201718002). Additional support was provided by Feringa Nobel Prize Scientist Joint Research Center.

Numerical simulation of flow field and residence time of nanoparticles in a 1000-ton industrial multi-jet combustion reactor

Jie Ju¹, Xianjian Duan², Bismark Sarkodie¹, Yanjie Hu¹, Hao Jiang¹, Chunzhong Li¹

1. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. Guangzhou Huifu Research Institute Co. Ltd., Guangzhou 510665, China

通讯作者: Yanjie Hu,E-mail:huyanjie@ecust.edu.cn;Chunzhong Li,E-mail:czli@ecust.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (21978088, 91534202, 51673063), Shanghai Technology Research Leader (20XD1433600), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutes of High Learning, the Basic Research Program of Shanghai (17JC1402300), the Shanghai City Board of education research and innovation project, and the Fundamental Research Funds for the Central Universities (222201718002). Additional support was provided by Feringa Nobel Prize Scientist Joint Research Center.

Abstract

Abstract: In this work, by establishing a three-dimensional physical model of a 1000-ton industrial multi-jet combustion reactor, a hexahedral structured grid was used to discretize the model. Combined with realizable k–ε model, eddy-dissipation-concept, discrete-ordinate radiation model, hydrogen 19-step detailed reaction mechanism, air age user-defined-function, velocity field, temperature field, concentration field and gas arrival time in the reactor were numerically simulated. The Euler–Lagrange method combined with the discrete-phase-model was used to reveal the flow characteristics of particles in the reactor, and based on this, the effects of the reactor aspect ratios, central jet gas velocity and particle size on the flow field characteristics and particle back-mixing degree in the reactor were investigated. The results show that with the decrease of aspect ratio in the combustion reactors, the velocity and temperature attenuation in the reactor are intensified, the vortex phenomenon is aggravated, and the residence time distribution of nanoparticles is more dispersed. With the increase in the central jet gas velocities in reactors, the vortex lengthens along the axis, the turbulence intensity increases, and the residence time of particles decreases. The back-mixing degree and residence time of particles in the reactor also decrease with the increase in particle size. The simulation results can provide reference for the structural regulation of nanoparticles and the structural design of combustion reactor in the process of gas combustion synthesis.

Key words: Combustion reactor, Residence time distribution, Particle flow trajectory, Back-mixing, Numerical simulation

摘要： In this work, by establishing a three-dimensional physical model of a 1000-ton industrial multi-jet combustion reactor, a hexahedral structured grid was used to discretize the model. Combined with realizable k–ε model, eddy-dissipation-concept, discrete-ordinate radiation model, hydrogen 19-step detailed reaction mechanism, air age user-defined-function, velocity field, temperature field, concentration field and gas arrival time in the reactor were numerically simulated. The Euler–Lagrange method combined with the discrete-phase-model was used to reveal the flow characteristics of particles in the reactor, and based on this, the effects of the reactor aspect ratios, central jet gas velocity and particle size on the flow field characteristics and particle back-mixing degree in the reactor were investigated. The results show that with the decrease of aspect ratio in the combustion reactors, the velocity and temperature attenuation in the reactor are intensified, the vortex phenomenon is aggravated, and the residence time distribution of nanoparticles is more dispersed. With the increase in the central jet gas velocities in reactors, the vortex lengthens along the axis, the turbulence intensity increases, and the residence time of particles decreases. The back-mixing degree and residence time of particles in the reactor also decrease with the increase in particle size. The simulation results can provide reference for the structural regulation of nanoparticles and the structural design of combustion reactor in the process of gas combustion synthesis.

关键词: Combustion reactor, Residence time distribution, Particle flow trajectory, Back-mixing, Numerical simulation

Jie Ju, Xianjian Duan, Bismark Sarkodie, Yanjie Hu, Hao Jiang, Chunzhong Li. Numerical simulation of flow field and residence time of nanoparticles in a 1000-ton industrial multi-jet combustion reactor[J]. Chinese Journal of Chemical Engineering, 2022, 51(11): 86-99.

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Numerical simulation of flow field and residence time of nanoparticles in a 1000-ton industrial multi-jet combustion reactor

Numerical simulation of flow field and residence time of nanoparticles in a 1000-ton industrial multi-jet combustion reactor

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