水下脉冲放电等离子体系统及其放电特性研究  

Research on Pulsed Discharge Plasma System Underwater and Its Discharge Characteristics

作　　者：李海华 王魁英 杨小丽 王志琛 张梦梦 LI Haihua;WANG Kuiying;YANG Xiaoli;WANG Zhichen;ZHANG Mengmeng(School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China)

机构地区：[1]华北水利水电大学环境与市政工程学院,河南郑州450046

出　　处：《郑州大学学报（工学版）》2022年第3期93-97,110,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51708215)。

摘　　要：采用Ar/O_(2)混合气体作为放电气体,脉冲电源作为驱动电源以提高放电效率,采用微孔陶瓷电极以提高放电生成的活性物质的传质效果。通过最低激发电压分析和光谱诊断·OH、H_(2)O_(2)、O_(3)等活性物质生成情况,分析不同放电条件下的靛蓝染料降解特性,系统研究了该水下放电系统的放电特性。实验结果表明:该装置最低可实现2.1 kV的低电压驱动水下大面积均匀放电,氧气占比对放电激发电压的影响最大;光谱分析结果未能诊断到·OH的特征光谱,但是显示有激发态的H、O等活性物质生成;增加频率和电压有利于·OH、H_(2)O_(2)、O_(3)等活性物质的生成及染料脱色效率的增加;增加气体流量有利于H_(2)O_(2)、O_(3)的生成,但是不利于·OH的生成,整体上对染料脱色效率的影响不大;随着氧气占比增加,O_(3)生成量增加,但是·OH、H_(2)O_(2)及最终的染料脱色效率先增加后降低。综合考虑各因素及成本问题,系统最佳放电条件:气体流量Ar为160 mL/min、O_(2)为40 mL/min、输出频率为2 kHz、脉冲电源电压为5 kV、脉宽为1μs,此条件下放电10 min后对靛蓝二磺酸钠的平均脱色率达到97.8%。In this study,the discharge efficiency and mass transfer effect were improved with the Ar/O_(2) mixed gas as discharge gas,a pulse power supply as driving power,and a specially designed microporous ceramic electrode.Discharge characteristics underwater were systematically studied by the analysis of the lowest excitation voltage,emission spectrum,active substance generation(such as·OH、H2O_(2)、O_(3)),and Indigo Carmine degradation characteristics.Experimental results showed that this system could achieve a large-area uniform discharge underwater with driving voltage as low as 2.1 kV,the O_(2) proportion had the greatest effect on the excitation voltage of the discharge.Although the attempt to find the characteristic spectrum of·OH failed,active substances such as H and O in excited state were detected in the spectral analysis results.The increase of frequency and voltage was conducive to the generation of active substances,such as OH,H2O_(2),O_(3),and the dye decolorization efficiency.The increase of gas flow was in favor of the H2O_(2) and O_(3) generation,but adverse to the·OH generation,and had little effect on the dye decolorization efficiency.As the O_(2) proportion increased,the generation amount of O_(3) increased gradually,but the·OH,H2O_(2) generation,as well as the decolorization efficiency increased firstly and then decreased.Discharge conditions and cost problems were comprehensively considered,the optimum condition of this discharge system was as follow:gas flow 200 sccm(Ar 80%,O_(2)20%),frequency 2 kHz,voltage 5 kV,pulse width 1μs.The average decolorization rate of Indigo Carmine reached 97.8%in 10 minutes in this ideal discharge condition.

关 键 词：液相等离子体放电 微孔陶瓷电极 脉冲电源 水处理 高级氧化 

分 类 号：O646.9[理学—物理化学]