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

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.

Energy-Efficient Pathways for Pulsed-Plasma-Activated Sustainable Ammonia Synthesis

“…We can obtain the total capacitance C and dielectric capacitance C d of 71 and 162 pF, respectively. The gap capacitance C g from the equivalent electric circuit was calculated as follows: , 1 C = 1 C normald + 1 C normalg …”

“…When the gap is not discharging, the displacement current I d ( t ) is equal to the measured current I ( t ) and the conduction current I g ( t ) is equal to 0. When discharge is taking place, I d ( t ) and I g ( t ) can be obtained with the following equations: I normald ( t ) = C normald U ( t ) normald t I normalg ( t ) = I ( t ) − I normald ( t ) …”

Study on discharge characteristics and improving surface hydrophobicity of epoxy resin by nanosecond pulse excited argon/hexamethyldisiloxane jet array

“…Therefore, the regulation and control of the reactive species generation in plasma are important. Researches devoted efforts in the selection of precursors and power supplies, the optimization of the operation parameters and electrical structures to improve the generation of reactive species [25–27], which improved the plasma treatment effects. Shao et al.…”

“…Therefore, the regulation and control of the reactive species generation in plasma are important. Researches devoted efforts in the selection of precursors and power supplies, the optimization of the operation parameters and electrical structures to improve the generation of reactive species [25][26][27], which improved the plasma treatment effects. Shao et al used pulse voltage driven jet and DBD for PMMA surface modification and the results showed that the treated PMMA surface had better hydrophobicity than those with AC excited plasmas [21,28,29].…”

Investigations into Plasma-Mediated Decomposition of Organoiodide Species as a Pretreatment for Mitigation of Radioiodine Emissions

“…Belasri and Harrache study the production of NTP at low pressures, using a computer model of homogeneous DBD in pure xenon over a wide frequency range of 50 kHz and gas pressures of 100–800 Torr. Wang et al used electrical and optical diagnosis and temperature measurements to illustrate the impacts of ac and nanosecond pulse power supply on the discharge characteristics of coaxial DBD in order to produce double-layer DBD that generates atmospheric pressure plasma. Goldberg et al used an electric field four-wave mixing approach to produce high-pressure transient plasmas by delivering nanosecond pulse discharge and measuring the electric field in high-pressure transient plasmas with sub-nanosecond temporal resolution.…”