Study on Corona Discharge Characteristics of Soil under Pulse High Voltage

Abstract

With the rapid development of industrialization and urbanization, soil pollution is becoming more and more serious. As soil pollution is closely related to human health, soil pollution control is imminent. Since the 20th century, plasma technology is developing rapidly, and the low temperature plasma technology in the application in the field of environmental protection has received great attention. Therefore, the study of soil discharge characteristics is of great significance to explore the treatment of soil pollution by low temperature plasma technology. In this paper, the corona discharge characteristics of soil under pulse high voltage are studied by combining experiment with theory. In view of the problem that soil discharge phenomenon is difficult to observe or the observation cost is too high, this paper adopts CCD method to obtain the typical soil discharge image, and analyzes the discharge phenomenon. At the same time, the characteristics of soil discharge voltammetry under pulse high voltage were studied, and the typical current waveform of soil corona discharge under pulse high voltage was given. In addition, a spectrum diagnostic experiment platform was built to study the concentration of active particles corresponding to soil discharge through emission spectrum. In this paper, the effects of pulse voltage with different frequency and rising time on soil discharge characteristics were studied experimentally. Based on the typical discharge images, volt-ampere characteristics and spectral diagnostic data, the mechanism behind the experimental phenomenon was discussed. The research results have certain guiding significance for soil remediation by low-temperature plasma.