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利用静电分离技术从空气中分离平均直径为2μm的油滴,对小尺度的线—板式静电分离器的电晕放电特性和流型特征进行试验研究,放电电极接高压电源正极。测试在不同的气体流速、油滴浓度条件下分离器的伏安特性曲线。利用高速摄像机对其中的电流体流型特征进行可视化研究,试验测定进口流速为0.2 m/s、0.3 m/s、0.4 m/s,施加电压从0～16 kV条件下电流体流型的变化,得到在不同的施加电压和气体流速下的流型分布图。试验表明,进口流速对分离器的电场影响并不明显,而油滴浓度对电场有很大的影响,在相同的施加电压下电流密度随着油滴浓度的增大而降低。电流体流型的变化取决于进口流速和施加电压的相互作用。得到在不同的描述惯性力和电场力关系的量纲一参数雷诺数和电流体数下5种代表的电流体流型。
Electrostatic separation technology was used to separate oil droplets with an average diameter of 2μm from the air. The corona discharge characteristics and flow pattern characteristics of the small-scale wire-plate electrostatic separator were studied. The discharge electrodes were connected to the positive pole of the high-voltage power source. The voltammetric characteristics of the separator were tested under different gas flow rates and droplet concentrations. The characteristics of the current body flow pattern were visualized with a high-speed camera. The changes of the current body flow pattern at the inlet velocities of 0.2 m / s, 0.3 m / s and 0.4 m / s were measured and the applied voltage was varied from 0 to 16 kV , The flow pattern at different applied voltages and gas flow rates was obtained. The experimental results show that the influence of inlet velocity on the electric field of the separator is not obvious, and the droplet concentration has a great influence on the electric field. Under the same applied voltage, the current density decreases with the increase of oil drop concentration. The current flow pattern changes depending on the inlet flow rate and the applied voltage. Five representative current fluid flow patterns are obtained under the different dimension-parameter Reynolds number and current volume which describe the relationship between inertial force and electric field force.