电极结构对介质阻挡放电参数的影响研究

为了优化介质阻挡放电(DBD)反应器设计,提高放电效率,提出一种针阵列芒刺状棒电极结构。利用电压-电荷Lissajous图形法,研究了光滑铜棒、螺纹铜棒和针阵列芒刺状铜棒电极等反应器电极结构对DBD放电参数的影响。实验结果表明,随着外加激励电压的升高,5种电极结构的放电功率P和平均放电电流Im及周期传输电荷量Q都随之增大。相同激励电压下,针阵列芒刺状棒电极的P、Im、Q值最大。针阵列芒刺状铜棒电极的气隙等效电容Cg随电压的升高呈震荡形式增加,而光滑电极和螺纹电极的Cg随电压的升高呈减小的趋势。研究结果表明,针阵列芒刺状铜棒电极更有利于挥发性有机物的去除,针间距越小,能量利用率越高。

Effect of Electrode Structure on the Parameters of Dielectric Barrier Discharge

In order to optimize the structure of dielectric barrier discharge(DBD) reactor and improve discharging efficiency,a needle array structure of copper stick electrodes is presented.The effects of five different electrode structures on the main parameters of discharge are studied by Q-V Lissajous figures in DBD experiment system.The five electrode structures include: smooth copper stick electrode,screw thread copper stick electrode,and three needle array copper stick electrodes with different spacing.The results show that increasing voltage can effectively enhance DBD power,average current and the amount of charge transferred in a cycle,and that the parameters of three needle array copper stick electrodes are larger than that of other two electrodes under the same voltage.With the applied voltage increasing,the equivalent capacitance of the air gap of the needle array copper stick electrodes increases,while that of the screw thread copper stick electrode and the smooth copper stick electrode decreases.Thereby,needle array copper stick electrode is more suitable for the removal of volatile organic compounds,and the shorter the needle spacing,the higher the energy utilization.