Particle size distribution in CPFD modeling of gas-solid flows in a CFB riser

查看全文 作　　者：Qinggong [1]Wang;Timo [2]Niemi;Juho [2]Peltola;Sirpa [2]Kallio;Hairui [1]Yang;Junfu [1]Lu;Lubin [3]Weic

机构地区：[1]Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Thermal Engineering.Tsinghua University;[2]VTT Technical Research Centre of Finland;[3]School of Chemical and Environmental Engineering,China University of Mining and Technology

出　　处：《Particuology》索引2015年第13卷第4期,共11页

基　　金：provided by the National Program on Key Basic Research Project(973 Program) of China(No.2012CB214900);the financial support from Tekes,VTT Technical Research Centre of Finland,Etel-Savon Energia Oy,Fortum,Metso Power Oy and Numerola Oy;the support from Saarijrven KaukolmpOy. 摘　　要：A computational particle fluid dynamics(CPFD) numerical method to model gas-solid flows in a circulating fluidized bed(CFB) riser was used to assess the effects of particle size distribution(PSD) on solids distribution and flow.We investigated a binary PSD and a polydisperse PSD case.Our simulations were compared with measured solids concentrations and velocity profiles from experiments,as well as with a published Eulerian-Eulerian simulation.Overall flow patterns were similar for both simulation cases,as confirmed by experimental measurements.However,our fine-mesh CPFD simulations failed to predict a dense bottom region in the riser,as seen in other numerical studies.Above this bottom region,distributions of particle volume fraction and particle vertical velocity were consistent with our experiments,and the simulated average particle diameter decreased as a power function with riser height.Interactions between particles and walls also were successfully modeled,with accurate predictions for the lateral profiles of particle vertical velocity.It was easy to implement PSD into the CPFD numerical model,and it required fewer computational resources compared with other models,especially when particles with a polydisperse PSD were present in the heterogeneous flow. 关键词：颗粒粒径分布气固两相流动循环流化床建模计算流体动力学管内实验测量流动模型

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Particle size distribution in CPFD modeling of gas-solid flows in a CFB riser

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