REDUCTION OF OZONE GENERATION IN ELECTROSTATIC PRECIPITATOR

The influence of electrode shape on ozone generation in electrostatic precipitator (ESP) has been experimentally investigated. It experimented by using the two-stage-type ESP composed of a precharger and collecting section. In the precharger section, three types of high voltage electrode of a wire, a thin plate, and a saw-tooth were used to experiment. Each ground electrode used a plate. The collecting section had a parallel-plates configuration. The gases exhausted from the diesel engine were diluted with air and introduced into ESP. The electrical characteristics in a corona discharge on each electrode are summarized. The corona discharge luminescence was observed by each electrode type. In the positive corona discharge, the thin plate type electrode has shown low ozone generation compared with the wire type. In the negative corona discharge, the saw-tooth type electrode has also shown low ozone generation compared with the wire type. All current characteristics of the collection efficiency of the wire and the thin plate were almost the same. Those of the wire and the saw-tooth in negative polarity were also almost the same. These results have great practical importance for improving the performance of the two-stage type electrostatic precipitator as it allows the collecting efficiency of the unit to be increased without exceeding the ozone generation.