Using Bipolar Corona Discharge for Electrostatic Purification of Gases

Abstract: The application of a bipolar corona discharge for the electrical purification of gases is considered. The design and operation principle of the developed unit based on the simultaneous use of centrifugal and electrostatic forces for the trapping of solid particles are described. The charge distribution in the field of the bipolar corona is illustrated. Electrodes of different polarity with a small radius generate a bipolar corona discharge, passing through which some of the particles are charged positively, while others are charged negatively. This promotes a more intense coagulation process, owing to which the level of gas purification increases under the action of centrifugal forces. Particular attention is paid to the testing results of a centrifugal electrostatic precipitator to assess its efficiency. The experiments have been conducted using a D242 diesel engine that acted as a “generator” of a gas flow containing solid particles of soot. A current–voltage curve has been plotted for the electrostatic precipitator prototype, and the mass concentration of pollutants depending on the diesel power has been experimentally obtained. The experimental data have confirmed that the centrifugal electrostatic precipitator for gas purification from solid particles is highly efficient. © 2020, Allerton Press, Inc.