Numerical Modeling of Conductive Particle Trajectories in Roll-Type Corona-Electrostatic Separators
Numerical Modeling of Conductive Particle Trajectories in Roll-Type Corona-Electrostatic Separators
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DOI：
10.1109/tia.2007.904363
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发表时间：
2007-09
影响因子：
4.4
通讯作者：
M. Younes;A. Tilmatine;K. Medles;M. Rahli;L. Dascalescu
中科院分区：
文献类型：
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作者：
M. Younes;A. Tilmatine;K. Medles;M. Rahli;L. Dascalescu
已经进行了几次尝试来模拟辊型静电分离器中的颗粒轨迹。然而，预测值的结果是有限的简化假设的电场分布，以及粒子充电和放电机制的过多数量。本工作的目的是通过考虑以下因素来改进现有模型：（1）分离器活性区电场的不均匀性和（2）电极之间发生火花放电的影响。基于先前的观察，假设导电颗粒在不再暴露于电晕放电时剥离。对不同尺寸的颗粒进行了数值模拟。使用有限元程序计算轨迹的每个点中的电场。结果发现：（1）一些较小的颗粒撞击静电电极并偏离到收集器的中间隔室，以及（2）伴随火花放电的场退火显著地影响导电颗粒的轨迹。本研究结果可指导新型电选应用的设计。
Several attempts have already been made to simulate particle trajectories in roll-type electrostatic separators. However, the predictive value of the results is limited by an excessive number of simplifying assumptions regarding the electric field distribution, as well as particle charging and discharging mechanisms. The present work is aimed at improving the existing models by taking into account: (1) the non-uniformity of the electric field in the active zone of the separator and (2) the effect of spark discharges occurring between the electrodes. Based on previous observations, the conductive particles were assumed to lift-off when no longer exposed to corona discharge. The numerical simulations were performed for particles of various sizes. The electric field was computed in each point of the trajectory using a finite element program. It was found that: (1) some of the smaller particles impact the static electrode and are deviated to the middling compartment of the collector and (2) field annealing which accompanies spark discharges significantly affects the trajectories of conductive particles. The results of this study could guide the design of new electrostatic separation applications.