多粒径颗粒在圆形偏心滚筒内的运动混合

发布时间：2018-06-17 21:01

本文选题：离散单元法 + 偏心滚筒　；参考：《化工进展》2017年02期

【摘要】：采用离散单元法(DEM),对5种粒径颗粒在滚筒内的运动混合进行数值模拟,研究了偏心距对滚筒内颗粒体系分区及区域变化、大颗粒速度变化和多粒径颗粒混合程度的影响。结果表明;非偏心滚筒内处于滚落运动模式的颗粒体系分为3个区域:平流层、活动层和涡心;偏心滚筒内不存在实际的涡心,随着滚筒转动,"移动涡心"的形状大小和位置都在周期性变化。在不同颗粒运动周期中,非偏心滚筒内的大颗粒在平流层中的匀速度基本相等;而在偏心滚筒内,大颗粒在相邻两次平流层中的两次匀速度基本都不相等,且偏心距越大的滚筒内,颗粒匀速度的变化越明显。偏心距基本不影响滚筒内多粒径颗粒的接触效果,多粒径颗粒在滚筒内的混合过程中,接触数的变化类似阻尼振动曲线变化。
[Abstract]:A discrete element method was used to simulate the motion and mixing of five kinds of particles in the drum. The effects of eccentricity on the partition and regional change of particle system, the velocity change of large particle and the mixing degree of multi-particle in the cylinder were studied. The results show that the particle system in the non-eccentric cylinder is divided into three regions: the stratosphere, the active layer and the vortex core, and there is no actual vortex center in the eccentric cylinder. As the drum rotates, the shape and position of the moving vortex center change periodically. In different particle motion cycles, the uniform velocities of large particles in the non-eccentric cylinder are basically equal in the stratosphere, while in the eccentric cylinder, the two uniform velocities of the large particles in the adjacent stratosphere are basically not equal. The larger the eccentricity, the more obvious the change of particle uniform velocity. The eccentricity does not affect the contact effect of the multi-particle in the cylinder, and the change of the contact number is similar to that of the damping vibration curve during the mixing process of the multi-particle.
【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资助项目
【分类号】：TQ027.1

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