The United States of America As Represented by the Administrator of the

The United States of America As Represented by the Environmental

Duane H Pontius

Wallace B Smith

Phillip V Bush

An electrostatic precipitator for the removal of dust having a resistivity of from 10.sup.9 to 5.times.10.sup.12 ohm cm from a gas wherein negatively biased discharge rods are arranged in a plane between grounded plates, and wherein the rods are of a diameter of approximately 3/8' (approximately 0.375 inch) enabling increased level of electrical field to be employed without the problem of back corona discharge.

Electrostatic precipitating system

An apparatus and method for reducing back corona effects while charging high resistivity dust or the like in a corona field, includes a corona discharge electrode, a passive electrode and a screen electrode, the screen electrode being positioned between the discharge electrode and the passive electrode. The screen electrode is positioned more closely to the passive electrode than the discharge electrode and is supplied with an electrical potential which is of the same polarity as and a fraction of the magnitude of the discharge electrode relative to the passive electrode. Gas having entrained therein the particulate material, which is to be removed, flows between the screen and discharge electrode and thence to a particulate material collection stage. The space between the screen and corona discharge electrode remains essentially a unipolar ion field, while ions of the opposite polarity originating at passive electrode due to back corona are collected by the screen electrode.

Growing community of inventors

Birmingham, AL, United States of America

Duane H Pontius