<論文>電気集塵装置における逆電離発生機構

概要

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Efficiency and running system of electrostatic precipitator (ESP) has been improved and develope on the past hundred years. Recently, some ESP plants have been facing a new type of problem, that is back ionization or back corona discharge which occurs in boilers with combustion of low sulfur coal fuel. Occurrence of this phenomena greatly reduces the collecting efficiency in operating ESP. Back ionization is one of the partial discharge which grows on or in collected dust layer with very high resistivity. Its starting and growing process has been investigated by considering the conduction mechanism of the dust layers on our research. We measured the resistivity characteristics of fly ash dust layer under various conditions of temperature, applied electric field and thickness of layer. V-I characteristics are also measured when the back ionization starts and grows with pin and plate electrode sandwiched dust layers of various thicknesses. The result of our experiments, we described the distribution of electric potential between the discharge and the collecting electrode through dust layer. It is concluded that back ionization starts with the breakdown discharge at some spots in the dust layer near the collecting electrode or on the dust surface where the electric field is enhanced by the ionic charge concentration and ion shower by corona discharge.
神戸市立工業高等専門学校の論文
1997-02-28