Abstract
Electrostatic precipitator (ESP) is an electrohydrodynamic-based air filter that charges particles based on corona discharge and collects particles by induced electrostatic forces. Inducing corona discharge requires strong electric fields that, however, bring reliability issues because of oxidation. This paper presents the characteristics of an ESP that uses the cylindrical corona electrodes whose longitudinal axis is perpendicular to the surface of the ground electrode. The characteristics include the current-voltage curve, the surface oxidation of the cylindrical corona electrodes, and the element analysis. The characteristics are presented with respect to the pitch and diameter of the cylindrical corona electrodes. The results show that the characteristics mentioned above can correlate to the electric fields around the cylindrical corona electrodes. Stronger electric field around the cylindrical corona electrode results in higher collection efficiency, more oxidation on the cylindrical corona electrode, and shorter life of the cylindrical corona electrode.
Highlights
Aerosol particles have been confirmed to be severely adverse to public health [1] and have caused millions of death a year worldwide [2]
This paper presents the characteristic changes of the cylindrical corona electrodes that are used in an Electrostatic precipitator (ESP) after long-term operation, including the current-time curves, the surface oxidation images, and the element analysis
To be noted that corona discharge happens when the electric field strength falls within the breakdown electric strength (~3.2 Â 106 V/m) and a certain high electric strength that makes sparkover, while both strengths are a function of geometrical configurations of the electrodes and the dielectric conditions
Summary
Aerosol particles have been confirmed to be severely adverse to public health [1] and have caused millions of death a year worldwide [2]. Filtering aerosol particles becomes an important issue from the epidemiology point of view. Electrostatic precipitator (ESP) is one of the devices that are used to filter aerosol particles. The charger consists of one corona electrode (high-voltage) and two exciting electrodes (grounded), creating an extremely strong electric field around the corona electrode to make the corona discharge happen. The collector includes one repelling electrode (high-voltage) and two collecting electrodes (grounded), creating a strong electric field in-between. Incoming particles get charged by the effects of corona discharge when passing by the charger. Instead of moving straightforward, the charged particles would move toward the collecting electrodes because of the induced electrostatic forces.
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