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

作　　者：Jie Ju Xianjian Duan Bismark Sarkodie Yanjie Hu Hao Jiang Chunzhong Li 

机构地区：[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

出　　处：《Chinese Journal of Chemical Engineering》2022年第11期86-99,共14页中国化学工程学报（英文版）

基　　金：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;the Fundamental Research Funds for the Central Universities(222201718002);provided by Feringa Nobel Prize Scientist Joint Research Center。

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–εmodel,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 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ021.1[化学工程]