Investigation on discharge characteristics of a coaxial dielectric barrier discharge reactor driven by AC and ns power sources
Investigation on discharge characteristics of a coaxial dielectric barrier discharge reactor driven by AC and ns power sources
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交流纳秒电源驱动同轴介质阻挡放电反应器放电特性研究
DOI：
10.1088/2058-6272/aaa357
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发表时间：
2018
影响因子：
1.7
通讯作者：
Fang Zhi
中科院分区：
文献类型：
--
作者：
Wang Qian;Liu Feng;Miao Chuanrun;Yan Bing;Fang Zhi
研制了一种用于尾气处理的双层介质阻挡同轴介质阻挡放电(DBD)反应器，采用交流功率或纳秒(Ns)脉冲激励产生大气压等离子体。为了优化同轴DBD反应器的性能，从光电特性和工作温度等方面对交流和ns脉冲同轴DBD的放电均匀性、功率沉积、能量效率和工作温度等特性进行了对比研究。从交流和纳秒脉冲同轴DBD的外加电压和测量电流中提取气隙和介质层上的电压以及导通和位移电流，以通过等效电气模型计算功率沉积和能量效率。利用光学图像和红外摄像机对同轴DBD反应器的放电均匀性和工作温度进行了监测和分析。采用热传导模型计算了石英管内部的温度。结果表明，与交流激励相比，ns脉冲同轴DBD具有更高的等离子体瞬时功率沉积、更低的总功率消耗和更高的能量效率，并且更均匀和稳定。经S 900后，交流和纳秒脉冲激励同轴DBD外壁温度分别达到158C和64.3C。比较不同功率激励下同轴DBD的放电特性，对于了解DBD的放电机理，降低能量损耗，优化工业应用中的同轴DBD的性能具有重要意义。
A coaxial dielectric barrier discharge (DBD) reactor with double layer dielectric barriers has been developed for exhaust gas treatment and excited either by AC power or nanosecond (ns) pulse to generate atmospheric pressure plasma. The comparative study on the discharge characteristics of the discharge uniformity, power deposition, energy efficiency, and operation temperature between AC and ns pulsed coaxial DBD is carried out in terms of optical and electrical characteristics and operation temperature for optimizing the coaxial DBD reactor performance. The voltages across the air gap and dielectric layer and the conduction and displacement currents are extracted from the applied voltages and measured currents of AC and ns pulsed coaxial DBDs for the calculation of the power depositions and energy efficiencies through an equivalent electrical model. The discharge uniformity and operating temperature of the coaxial DBD reactor are monitored and analyzed by optical images and infrared camera. A heat conduction model is used to calculate the temperature of the internal quartz tube. It is found that the ns pulsed coaxial DBD has a much higher instantaneous power deposition in plasma, a lower total power consumption, and a higher energy efficiency compared with that excited by AC power and is more homogeneous and stable. The temperature of the outside wall of the AC and ns pulse excited coaxial DBD reaches 158 °C and 64.3 °C after 900 s operation, respectively. The experimental results on the comparison of the discharge characteristics of coaxial DBDs excited by different powers are significant for understanding of the mechanism of DBDs, reducing energy loss, and optimizing the performance of coaxial DBD in industrial applications.