Research on Pulsed Discharge Plasma System Underwater and Its Discharge Characteristics

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Research on Pulsed Discharge Plasma System Underwater and Its Discharge Characteristics

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[1]LI Haihua,WANG Kuiying,YANG Xiaoli,et al.Research on Pulsed Discharge Plasma System Underwater and Its Discharge Characteristics[J].Journal of Zhengzhou University (Engineering Science),2022,43(03):93-97.[doi:10.13705/j.issn.1671-6833.2022.03.020]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 03 Page number: 93-97 Column: Public date: 2022-04-10

Title:: Research on Pulsed Discharge Plasma System Underwater and Its Discharge Characteristics

Author(s):: LI Haihua; WANG Kuiying; YANG Xiaoli; WANG Zhichen; ZHANG Mengmeng; School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China

Keywords:: plasma discharge in liquid; microporous ceramic electrode; pulse power supply; water treatment; advanced oxidation

CLC:: O646. 9

DOI:: 10.13705/j.issn.1671-6833.2022.03.020

Abstract:: In this study, the discharge efficiency and mass transfer effect were improved with the Ar/O2 mixed gas as discharge gas, a pulse power supply as driving power, and a specially designed microporous ceramic electrode.Discharge characteristics underwater were systematically studied by the analysis of the lowest excitation voltage, emission spectrum, active substance generation(such as·OH、H2O2、O3), and Indigo Carmine degradation characteristics.Experimental results showed that this system could achieve a large-area uniform discharge underwater with driving voltage as low as 2.1 kV, the O2 proportion had the greatest effect on the excitation voltage of the discharge.Although the attempt to find the characteristic spectrum of·OH failed, active substances such as H and O in excited state were detected in the spectral analysis results.The increase of frequency and voltage was conducive to the generation of active substances, such as OH, H2O2, O3, and the dye decolorization efficiency.The increase of gas flow was in favor of the H2O2 and O3 generation, but adverse to the·OH generation, and had little effect on the dye decolorization efficiency.As the O2 proportion increased, the generation amount of O3 increased gradually, but the·OH, H2O2 generation, as well as the decolorization efficiency increased firstly and then decreased.Discharge conditions and cost problems were comprehensively considered, the optimum condition of this discharge system was as follow: gas flow 200 sccm(Ar 80%，O2 20%), frequency 2 kHz, voltage 5 kV, pulse width 1 μs.The average decolorization rate of Indigo Carmine reached 97.8% in 10 minutes in this ideal discharge condition.

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Last Update: 2022-05-02