Ozone-Generation Panel with an Atmospheric Dielectric Barrier Discharge
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Ozone-Generation Panel with an Atmospheric Dielectric Barrier Discharge Sang-Jin Kim, Sichan Kim, Byung-Koo Son, Kyu-Hang Lee, Bong-Joo Park and Guangsup Cho∗ Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Korea (Received 5 July 2019; accepted 21 May 2020) For small-scale discharge panels of volume-dielectric barrier discharge (V-DBD) and surface-DBD (S-DBD) with an Al2 O3 -ceramic dielectric layer and a sinusoidal alternating current (AC)-voltage at a frequency of 55 kHz, the plasma and the ozone densities in the discharge area are estimated by analyzing the I -V (current and voltage) characteristics and ozone measuring the concentration in a liter-scale container. With a plasma current in the range of 10–20 mA, the plasma density is np ∼ (1018 –1019 ) m−3 for the V-DBD and np ∼ (1017 –1018 ) m−3 for the S-DBD, irrespective of environmental temperature. However, the ozone density generated on DBD is strongly affected by the electrode temperature and is reduced as the environmental temperature is increased. At an environmental temperature as low as 10 ◦ C, the ozone density generated on the V-DBD is as low as n(O3 ) ∼ (1017 –1018 ) m−3 with a high electrode temperature of more than 100 ◦ C; on the other hand, the ozone density on the S-DBD is n(O3 ) ∼ (1019 –1020 ) m−3 with a low electrode temperature of ∼30 ◦ C, which is higher by an order of 102 than the plasma density on the S-DBD plasma panel. Keywords: Atmospheric pressure non-thermal plasma, Dielectric barrier discharge, Dielectrics, Plasma density, Ozone density DOI: 10.3938/jkps.77.572
I. INTRODUCTION
Ozone generators convert oxygen mainly by using energy as a physical and chemical stimulus to the ozone. Various types of ozone-generation methods have been developed, including the dielectric barrier discharge (DBD), electrolysis, photochemical, high-frequency electric field, and radiation irradiation methods. For industrial applications, the silent discharge method is the most widely used owing to its energy efficiency, performance safety, and simple operation. The generation of ozone using a DBD is the most important applications of non-equilibrium discharges for plasma chemical synthesis [1–9]. Historically, the DBD dates back to 1857, when Werner von Siemens [1] showed that ozone could be produced within an oxygen flow passing through an annular discharge space between two coaxial glass cylinders. The electrical discharge was sustained by using an alternating high voltage applied through the glass walls. Shortly after 1900, the first industrial ozone-generating systems for the treatment of drinking water were installed in Nice, France (1907) and St. Petersburg, Russia (1910). Today, many drinking water plants throughout the world use ozone generators utilizing a silent discharge to convert oxygen to the chemically much more active ozone. ∗ E-mail:
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pISSN:0374-4884/eISSN:1976-8524
To date, the main application of ozone remains water purification processes. Owing to its oxidizing power, ozone is used as a poten
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