Investigation on discharge characteristics of a coaxial dielectric barrier discharge reactor driven by AC and ns power sources

Qian WANG (王乾); Feng LIU (刘峰); Chuanrun MIAO (苗传润); Bing YAN (严冰); Zhi FANG (方志)

doi:10.1088/2058-6272/aaa357

Plasma Science and Technology > 2018 > 20(3): 35404-035404. > DOI: 10.1088/2058-6272/aaa357

Qian WANG (王乾), Feng LIU (刘峰), Chuanrun MIAO (苗传润), Bing YAN (严冰), Zhi FANG (方志). Investigation on discharge characteristics of a coaxial dielectric barrier discharge reactor driven by AC and ns power sources[J]. Plasma Science and Technology, 2018, 20(3): 35404-035404. DOI: 10.1088/2058-6272/aaa357

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Investigation on discharge characteristics of a coaxial dielectric barrier discharge reactor driven by AC and ns power sources

College of Electrical Engineering and Control Science, Nanjing Tech University, Nanjing 211816, People’s Republic of China

Funds: This work is supported by National Natural Science Foundation of China (Nos. 51777091 and 51677083).

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Received Date: October 10, 2017

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Abstract

Abstract

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.
- coaxial dielectric barrier discharge,
- discharge characteristics,
- nanosecond pulse,
- operation temperature

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References (32)

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