Installation for air cleaning from organic impurities by plasma formed by barrier discharge of nanosecond duration

• Published in: Instruments and experimental techniques (New York) Vol. 55; no. 5; pp. 605 - 607
• Main Authors: Korotkov, S. V., Aristov, Yu. V., Kozlov, A. K., Korotkov, D. A., Lyublinsky, A. G., Spichkin, G. L.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-09-2012
• Subjects: Biology; Electrical Engineering; Measurement Science and Instrumentation; Medicine; Physical Chemistry; Physical Instruments for Ecology; Physics; Physics and Astronomy; Collector Junction; High Voltage Pulse; Methylmercaptan; Activate Carbon Granule; Barrier Discharge
• ISSN: 0020-4412; 1608-3180
• DOI: 10.1134/S0020441212050041

A prototype installation for air cleaning by plasma, which consists of a barrier-type discharge reactor and a high-voltage nanosecond-pulse supply generator, which is based on drift step recovery diodes, is considered. A stable corona-type barrier discharge was obtained at a 3-kHz supply-pulse repetition frequency. The discharge remained nonlocalized even at a small gas-discharge gap (∼6 mm) due to a short (∼25 ns) pulse duration, which allows a quite uniform effect on the air flow. The high rise rate (∼6 kV/ns) of the applied supply voltage pulses determines the high voltage amplitude (∼25 kV) at the reactor at the breakdown moment and allows maintenance of high electric-field intensity and a high intensity of plasma chemical processes. Thus, an electrical power lower than 8 W is required at the reactor input to produce 1 g of ozone per hour. The concentration of methylmercaptan in air during waste-water smell deodorizing at State Unitary Enterprise “Vodokanal of St. Petersburg” was reduced down to an allowable level of 0.5 mg/m
3
at the electrical power consumption no higher than 0.25 W per cubic meter of air.