关键词: 二元颗粒, 离散单元法, 柱体内构件, 混合死区, 增混

Abstract: Accounting for the phenomenon of mixed dead zone in mixing process of binary granular systems,column internals wee set in the horizontal drum to augment mixing. The contact number was taken as a particle mixing indicator. The discrete element method was employed to study mixing of the binary particles with the column internals. The mechanisms of augmenting mixing of the column internals were discussed in this paper. The results showed that the column internals can destroy the mixed dead zone of the aggregated particles. When the components are set in the drum,the mechanisms of convection and diffusion are enhanced,and the segregation of the binary particles is suppressed. Moreover,the column internals can improve the mixing efficiency and change the stability of mixing. It was noted that the mixing effect of binary particles improves with the increase of the number of cylinder components in the drum in a certain range,and excessive number of internals are unfavorable for mixing. The column internals inhibit mixing of particle system when the drum starts to rotate,and the internals achieve the purpose of augment mixing after a period of movement. The results can provide theoretical guidance for equipment improvement of particle material in the industry of the augmenting mixing.

Key words: binary granular systems, discrete element method, column internal, mixed dead zone, augmenting mixing