Experimental Study of Corona I-V Characteristics of Wire-duct ESP with Grading
Abou-Hashema M. El-Sayed1 and H. Ziedan2
1Electrical Engineering Department, Faculty of Engineering, Minia University, Egypt
2Electrical Engineering Department, Faculty of Engineering, Assiut University, Egypt
Abstract- This paper aims to investigate experimentally how the characteristics of the corona current-voltage in wire-duct electrostatic precipitators (ESP) are influenced by grading of wire-to-wire spacing and with grading of wire radius. The grading is made to counterbalance the shielding effect of outer wires on the central ones. The measurements have been made using a laboratory model of precipitators with and without grading of wire radius and wire-to-wire spacing. Also the effect of grading of both wire-to-wire spacing and wire radius on current-voltage characteristics of wire-duct precipitator has been explored. A comparison is made between precipitator currents with grading against those currents measured at constant wire-to-wire spacing and constant radius at the same applied voltage. This is achieved by decreasing the wire-to-wire spacing and increasing the wire radius in the direction from the center to the ends of the precipitator. Grading of both wire-to-wire spacing and wire radius tend to improve the collection efficiency more than the grading of wire-to-wire spacing only or grading of wire radius only.
Keywords- High voltage, electrostatic precipitators, corona effect, grading