Simulation of particle flow impact wall based on DEM

SHEN Wenjun， YUAN Jian
（The MOE Key Laboratory of Special Purpose Equipment and Advanced Processing，
Zhejiang University of Technology， Hangzhou 310032， China）

Abstract： In order to solve the problems of wear and tear of the catalyst particles, in catalgtic cracking unit the first thing is to solve the problem of particle′s motion feature, the numerical simulation method of discrete element method（DEM） was applied to the catalyst particles impinging wall model. The model of the catalyst particles impinging on the wall surface was simplified as the parlicle flow impinging wall model. The discrete element analysis of particle flow impinging on  the wall surface was carried out The relation between velocity and time， displacement and time, and relation between kinetic energy and time of particle flow was established The marked particle′s tacking was  tacked The reason for particle irregular distribution was explained A method was presented to a random sample in subsection interzone seek to wall′s average stressDifferent incident speed of  the effect of stress was compared and analyzedThe simulation results show that different incident speed has an unsteady influence on wall stress， different incident speed has an effect on the size of the wall stress and the bigger of incident speed， the bigger of wall stress in an certain range
Key words： catalytic cracking unit;   particle flow impact; discrete element method（DEM）numerical simulation