Experimental Analysis of Corona Current Density Distribution and Electric Field at Variable Temperatures in Electrostatic Precipitator

In blade-to-plane electrostatic precipitators at variable temperatures, the electric field and the current density distributions of the negative DC corona were experimentally analyzed, and the corona discharge was used as the source of ionization. In this research, an experimental cell was designed and built to adjust the temperature from 20 to 46°C within the cell. The current density-voltage characteristic and the radial distance distribution of the current density of an electrostatic blade-to-plane precipitator were measured over a temperature interval. Based on the Tassicker and Townsend models, the electric field and the onset voltage were determined. With the rise in temperature, the corona current obtained at the collector plate has been observed to increase, but the onset voltage decreased. The applied voltage and temperature greatly affected the corona current density characteristics and the electrical field. If an exponent of 4.6 to 5 for a negative corona discharge is taken, the DC density distribution is satisfied, then the current density distribution follows the well-known Warburg theorem.