电极结构对多孔陶瓷孔内微放电特性及苯降解的影响  

Effect of Electrode Configuration on Microdischarge Characteristics in Porous Ceramics and Benzene Degradation

作　　者：商克峰[1,2] 曹无敌 符梦辑 Shang Kefeng;Cao Wudi;Fu Mengji(School of Electrical Engineering Dalian University of Technology,Dalian 116024,China;Key Laboratory of Industrial Ecology and Environmental Engineering Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学电气工程学院,大连116024 [2]大连理工大学工业生态与环境工程教育部重点实验室,大连116024

出　　处：《电工技术学报》2023年第6期1687-1694,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51977024,21577011)。

摘　　要：微放电可在小的空间中产生高密度等离子体,有利于气体污染物的高效处理。该文研究了电极结构及电极形状对多孔陶瓷孔内微放电特性及苯降解的影响。结果表明:在相同外加电压条件下,与二电极结构相比,三电极结构可生成更多的丝状放电通道,峰-峰电荷Qpk-pk提高了3.2倍,放电电荷Qd提高了4.4倍,放电功率从0.8W提高到8.6W,苯降解效率提高了35.1%;网高压电极结构相比于弹簧电极,能够增加有效放电面积并增强放电强度,放电功率相较于弹簧电极构型提高约4W,丝状放电通道能够充满放电空间,显著提高苯降解效率。Dielectric barrier discharge(DBD),which is characterized by numerous microdischarge channels in narrow gas gap,can stably produce discharge plasma at atmospheric pressure and room temperature.DBD process is simple and easy to operate,leading to a wide range of applications such as waste gas/water treatment,material surface modification,biomedicine and so on.Especially DBD has been hotly studied for volatile organic compounds(VOCs)treatment because of its low breakdown voltage,high electron density and reactive species.Previous studies have found that the electrode configuration of DBD device would change the plasma distribution and the generation characteristics of reactive species.However,few studies have focused on how to enhance the microdischarge in DBD reactor for promoting the degradation of VOCs.In this paper a coaxial tri-electrode DBD device filled with a porous ceramic tube with micron pore size is proposed for benzene degradation.The coaxial DBD reactor has a three electrode configuration which was named surface-volume hybrid DBD.The mesh or spring type high-voltage electrode was tightly pasted at the inside wall of a quartz tube tightly and then a porous ceramic tube with 60μm pore size was put in the quartz tube(QTⅠ)and acted as a barrier dielectric.The high voltage electrode was powered by an AC(0~60 kV,50 Hz)power supply.A rod-like electrode wrapped in a quartz tube(QTⅡ)was put in the middle of ceramic tube to act as one of ground electrode as well as an aluminum foil sheet was wrapped on the outside of QTⅠto act as another ground electrode.Firstly,the effect of electrode configuration and electrode geometry on the microdischarge characteristics including voltage and current waveforms,microdischarge channel distribution,Lissajous figures was measured.The three-electrode configuration presented stronger microdischarge which was characterized by more current pulses on the current waveforms,more and brighter microdischarge channels on the discharge images and larger Lissajous figure area,and me

关 键 词：介质阻挡放电 微放电 电极构型 苯降解 

分 类 号：TM8[电气工程—高电压与绝缘技术]