Numerical simulation of material mixing process with no-propeller drum

doi:10.16085/j.issn.1000-6613.2019-0938

Abstract

Abstract: Propeller mixing is the main materials mixing method at present, which is easy to press the materials with higher friction force. In order to solve this problem, the mixing process of drum without propeller is studied. It was adopt discrete element software EDEM to simulate the mixing process of two kinds of materials in the no-propeller drum, and analyzes the motion characteristic of materials during mixing process. The degree of mixing uniformity was quantitatively characterized by defining the particle mixing uniformity index, which is used to study the influence of particles mumber (10000-20000 particles) and rotating speed (7-22r/min) on the uniformity of the mixture. And the compressive force of particles was investigated as well. It is found that the mixing of two materials can be realized in the mixing process of no-propeller drum, and with the increase of rotating speed, the material can reach even quickly. The compressive force of the material fluctuates with the mixing process. The maximum compressive force is less than 0.6N and stable in the range of 0.1-0.35N. The average value of compressive force is less than 0.015N and stable in the range of 0.005-0.01N. The maximum value is about 20-30 times than the average value. With the increase of particles numbers and roller speeds, the compressive force increases slightly.

Key words: granular materials, mixing, computer simulation, discrete element, uniformity

摘要： 目前物料混合主要采用有桨混合方式，该方法容易使物料受到较大摩擦作用。为了解决这一问题，本文对无桨滚筒混合工艺过程进行探索研究。采用离散元软件EDEM模拟无桨滚筒对两种物料的混合过程，分析混合过程中物料的运动特征，通过定义颗粒混合均匀性指数来定量表征混合均匀程度，分析了不同填料（10000~20000个颗粒）和转速（7~22r/min）对混料均匀性的影响规律，并对物料受力情况进行了定量分析。研究结果表明：在无桨滚筒混料过程中，可以实现对两种物料的混合，且随着转速提高，物料能较快达到均匀。在混合过程中物料受力呈波动式变化，其中最大受力小于0.6N，稳定在0.1~0.35N；物料受力平均值小于0.015N，稳定在0.005~0.01N；最大受力是平均受力值的20~30倍；且随着填料和滚筒转速增加，物料的受力略有增加。

关键词: 颗粒物料, 混合, 计算机仿真, 离散元, 均匀性

CLC Number:

TQ027.1

SU Yang, LEI Quanhu, CHEN Song, LUO Zhilong, YUAN Zhanwei. Numerical simulation of material mixing process with no-propeller drum[J]. Chemical Industry and Engineering Progress, 2019, 38(s1): 59-63.

苏杨, 雷全虎, 陈松, 罗志龙, 袁战伟. 物料无桨混合过程数值模拟[J]. 化工进展, 2019, 38(s1): 59-63.

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