Effect of Woodceramics Grounded Electrode on Electrostatic Precipitation with Positive Corona Discharge

抄録

Corona discharge is an electrical discharge in air. An electrostatic precipitator is one of the applications using the corona discharge. In the corona discharge area of the electrostatic precipitator, an ionic wind is occurs with moving ions, additionally, charged particles drift by a Coulomb force from the high voltage wire electrode to the grounded plate electrode. When the grounded electrode is made of woodceramics instead of a stainless steel electrode, it is considered that the adsorption of gases is improved, then the fine charged particles trapped on the grounded electrode surface increase due to the porous structure and high resistivity of the woodceramics. The high resistivity electrode prevents the collected particles on the electrode releasing the charge. As a result, when the grounded electrode is made of woodceramics instead of the stainless steel electrode, the discharge current of the woodceramics and that of the stainless steel electrode have the same characteristics. The particle collection efficiency of the woodceramics electrode was higher than that of the stainless steel electrode in the particle size range from 0.3 to 5.0 μm. Additionally, it was observed that these particle collection efficacies were influenced by the initial particle concentration.