滚筒内柱体内构件对二元颗粒体系混合的影响

发布时间：2018-03-24 03:14

本文选题：二元颗粒　切入点：离散单元法　出处：《化工进展》2017年12期

【摘要】：针对滚筒内二元颗粒体系在混合过程中产生的混合死区现象,提出在混合死区位置设置柱体内构件的增混方式,以接触数作为混合评价指标,采用离散单元法研究柱体内构件对二元颗粒体系运动混合的影响,并分析其增混机理。研究结果表明:柱体内构件很大程度上破坏了聚集小颗粒的混合死区,强化了二元颗粒间的对流和扩散机制,同时抑制了颗粒的离析作用,提高了颗粒体系整体混合程度,同时,柱体内构件提高了二元颗粒体系的混合效率,改变了颗粒体系混合的稳定性;在一定的范围内,柱体内构件的数量越多,颗粒体系的混合效果越好,但如果数量过多,反而不利于二元颗粒间的混合;在滚筒开始转动的短暂时间内,柱体内构件反而抑制颗粒体系的混合,滚筒继续转动,才起到增混的效果。本研究可为二元颗粒物料增混设备的改进提供参考和依据。
[Abstract]:In view of the phenomenon of mixing dead zone in the mixing process of binary particle system in the cylinder, an increasing mixing mode of the column member is put forward in the mixing dead zone position, and the contact number is used as the mixed evaluation index. The discrete element method is used to study the effect of column components on the motion and mixing of binary particle system, and the mechanism of mixing is analyzed. The results show that the mixing dead zone of small particles is destroyed to a large extent. The mechanism of convection and diffusion between binary particles was strengthened, the segregation of particles was restrained, and the mixing degree of particle system was improved. At the same time, the mixing efficiency of binary particle system was improved. In a certain range, the greater the number of components in the column, the better the mixing effect of the particle system, but if the number of particles is too much, it is not conducive to the mixing of binary particles. During the short period when the drum begins to rotate, the mixing of the particle system is restrained by the components of the column, and the rolling of the drum continues to produce the effect of increasing the mixing. This study can provide a reference and basis for the improvement of the mixing equipment of binary particle materials.
【作者单位】：东北电力大学油页岩综合利用教育部工程研究中心;
【基金】：教育部长江学者和创新团队发展计划(IRT13052) 吉林省自然科学基金(20150101033JC) 吉林市科技计划(201464044) 吉教科合字2015-237项目
【分类号】：TQ027.1

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