单极芒刺静电净化装置芒刺和极板间距对电流密度的影响

Effect of distance between barb tip and electrode on current density distribution in unipolar barbed plate-plate electrostatic purifier

为了通过优化单极芒刺净化装置的结构参数,解决芒刺静电油烟净化装置中对微小油烟颗粒收集效率低的问题,采用数值模拟的方法研究了单极芒刺板-板式油烟静电净化装置中芒刺尖端与收极板间距对电流密度的影响。采用合适的静电场控制方程,提出了芒刺板-板极配方式的边界条件,选择有限体积法对电场进行了数值模拟计算,并将计算结果与实验值进行了对比。分析研究结果表明所建立的数值模拟方法可靠。在此基础上分别分析了芒刺尖端与收极板的间距和工作电压对收集板上电流密度的大小及分布的影响。分析结果表明,当间距取40 mm^75 mm时,在工作电压范围内,电流密度分布均匀,且电流密度强,说明该间距范围是最佳值。

In the unipolar barbed plate-plate electrostatic purifier,purification efficiency of the micro oil fume particles is low.In order to solve the problem of low purification efficiency by optimizing the structure parameters,the numerical simulation was used to analyze the effect of the distance between the barb tip and the electrode on the current density distribution.The electric field equations and the boundary conditions were proposed on the foundation of the wire-plate electrostatic precipitator and the system of equations was solved by the method of finite volume.Then,the numerical simulation results were compared with the experimental data to evaluate the accuracy of the electrical field model.The accurate numerical simulation method were applied to analyze the effect of the distance between the barb tip and the electrode on the current density distribution in the unipolar barbed plate-plate electrostatic purifier.The results indicate that suitable distance between the barb tip and the electrode is from 40 mm to 75 mm,during which the current density distribution is uniform and the value of the current density is high.