The effect of corona wire heating on the downstream ozone concentration profiles in an air-cleaning wire-duct electrostatic precipitator

The effect of corona wire heating on the downstream ozone concentration profiles in an air-cleaning wire-duct electrostatic precipitator was studied experimentally. The results show that ozone concentration profiles depend significantly on the applied voltage and polarity. Significant ozone concentrations were only observed in a narrow region downstream of the corona wire for positive coronas. For the corona wire surface temperature profile measurements made using a real-time IR thermoimage processing system, it was observed that the heat generated by corona discharge alone only increased the surface temperature of the corona wire by a few degrees centigrade. Ozone generated by corona discharges can be significantly decreased by the external heating of the corona wire