Numerical Simulation of Tribo-Aero-Electrostatic Separation of Mixed Granular Solids
Numerical Simulation of Tribo-Aero-Electrostatic Separation of Mixed Granular Solids
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DOI：
10.1109/ias.2011.6074285
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发表时间：
2011-11
影响因子：
4.4
通讯作者：
F. Rahou;A. Tilmatine;M. Bilici;L. Dascalescu
中科院分区：
文献类型：
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作者：
F. Rahou;A. Tilmatine;M. Bilici;L. Dascalescu
数值模拟可以成为研究和开发任何新的静电工艺的有力工具。本工作的目的是引入一个简单的数学模型，用于模拟最近获得专利的摩擦-空气-静电分离过程的结果，用于颗粒状材料的二元混合物。该方法的特征在于，在电场存在下，在流化床装置中产生颗粒的充电。该数学模型假定，颗粒被分离的概率可以表示为与属于另一类材料的颗粒碰撞次数的函数。当这种概率是由正态分布规律，模拟的结果显着不同的实验进行的聚酰胺和聚碳酸酯颗粒的颗粒混合物，在实验室摩擦空气静电分离器。为了提高模拟的预测能力，由实验数据回归得到的多项式函数被用来表示相同的概率。因此，对于颗粒混合物的各种组成，可以计算在电极处分离的颗粒的质量随时间的演变。计算结果与实验结果吻合较好。
Numerical simulation can be a powerful tool in the research and development of any new electrostatic process. The aim of the present work is to introduce a simple mathematical model for simulating the outcome of a recently patented tribo-aero-electrostatic separation process for binary mixtures of granular materials. The process is characterized by the fact that the charging of the granules is produced in a fluidized bed device, in the presence of an electric field. The mathematical model assumed that the probability of a granule to be separated can be expressed as a function of the number of impacts with granules belonging to the other class of materials. When this probability was given by a normal distribution law, the results of the simulations differed significantly from those of an experiment conducted with a granular mixture of polyamide and polycarbonate particles, in a laboratory tribo-aero-electrostatic separator. In order to improve the predictive capability of the simulations, a polynomial function derived from the regression of the experimental data was employed for expressing the same probability. Thus, it was possible to calculate the evolution in time of the mass of granules separated at the electrodes for various compositions of the granular mixture. The computed results were in good agreement with the experiments.