Numerical study on the filtration characteristics of fine particles in granular bed filter at high temperature  

作　　者：Kangning Zhu Jie Cai Yuan Li Xiaoyou Shen Jianfei Xi Yunjun Wang Zhongzhu Gu 

机构地区：[1]School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing,210023,China

出　　处：《Particuology》2024年第10期41-53,共13页颗粒学报（英文版）

基　　金：support provided by the National Natural Science Foundation of China(grant No.51878356).

摘　　要：Granular bed filter(GBF)has become one of the current research hot topics due to its excellent performance in removing fine particles.In this paper,a three-dimensional fixed bed GBF filtration model was established and its accuracy was verified.Then,the GBF filtration performance at high temperature were studied.The results demonstrate that elevating the temperature diminishes the filtration efficiency,albeit to a limited extent.The increasing of inlet gas velocity can significantly improve pressure drop for GBF and the filtration efficiency for fine particles of sizes larger than 5μm.As the diameter of stacked granular particle diameter grows,the filtration efficiency and pressure drop drops.The density of fine particles almost does not affect the filtration efficiency for fine particles of 1∼7μm,but a higher density leads to a higher filtration efficiency for fine particles of sizes bigger than 9μm.Additionally,as the fine particles size increases,the change of the filtration efficiency roughly goes through three stages:Stage 1:the filtration efficiency is basically unchanged;Stage 2:the filtration efficiency increases rapidly;Stage 3:the filtration efficiency increases steadily,but the rate of increase slows down.With the increase of the fine particles Stokes number,the filtration efficiency of GBF will pass through two phases of stabilization and rapid increase.

关 键 词：Granular bed filter Fine particles High temperature Filtration efficiency 

分 类 号：TQ02[化学工程]