Discharge electrode arrangement for disc electrostatic precipitator (DEP) and scrapers for both disc and discharge electrodes
AssigneeJohn P. Dunn
InventorJohn P. Dunn
Life of this patent
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Abstract
Methods and electrostatic precipitators achieve efficient separation. Scrapers are specifically designed to clean the electrodes in the electrostatic precipitators. Particulates are collected from an entrained air stream by keeping both the discharge and collection electrode surfaces clean during the precipitation process so that the electrical corona discharge remains constant and the electrical field flux lines are maintained. This is accomplished using a plurality of vertical disc electrodes and a plurality of horizontal discharge electrodes preferably combined with the ability to keep the electrodes clean during the exhaust process.
Claims34
A method for removing particles from a single main air stream in a disc electrostatic precipitator comprising a plurality of vertical rotatable circular disc collecting electrodes and a plurality of horizontal discharge electrodes located along an outer circumference of the vertical rotatable circular disc collecting electrodes, comprising the step of passing entrained air through the plurality of horizontal discharge electrodes and the plurality of vertical rotatable circular disc collecting electrodes, wherein a polarity of the vertical rotatable circular disc collecting electrodes is located at ground potential and high voltage direct current is applied to the horizontal discharge electrodes such that an electrical field is established between the horizontal discharge electrodes and the vertical rotatable circular disc collecting electrodes.
A disc electrostatic precipitator for removing particles from a single main air stream, comprising:
- a plurality of vertical rotatable circular disc collecting electrodes;
- and
- a plurality of horizontal discharge electrodes located along an outer circumference of the vertical rotatable circular disc collecting electrodes;
- wherein a polarity of the vertical rotatable circular disc collecting electrodes is located at ground potential and high voltage direct current is applied to the horizontal discharge electrodes such that there is an electrical field established between the horizontal discharge electrodes and the vertical rotatable circular disc collecting electrodes.
A method for keeping a plurality of horizontal discharge wire electrodes in a disc electrostatic precipitator clean during a precipitating process comprising the step of cleaning the horizontal discharge wire electrodes using a plurality of concentric tubular scrapers that traverse over the horizontal discharge wire electrodes to remove material deposited on the horizontal discharge wire electrodes.
A method for keeping a plurality of disc electrodes in a disc electrostatic precipitator clean comprising the steps of:
- cleaning a leading edge of the disc electrodes using a thin, flat blade that is set at a scraping operating angle such that scraped material free falls via gravity into a collection chamber and the flat blade is located out of the main air flow to prevent re-entrainment of particles back into a main stream;
- and
- cleaning the disc electrodes with a plurality of disc scrapers supported by scraper shaft spacer blocks at a first, lower end and supported at a second end on a disc support shaft spacer, wherein a position of the disc scrapers relative to the disc electrodes is controlled by an offset in the scraper shaft spacer blocks and the disc support shaft spacer.
A method for removing particles from a single main air stream in a disc electrostatic precipitator comprising the steps of:
- passing entrained air through a plurality of horizontal discharge electrodes and through a plurality of vertical circular disc collecting electrodes, wherein the plurality of horizontal discharge electrodes are located along an outer circumference of the vertical rotatable circular disc collecting electrodes;
- and
- cleaning the horizontal discharge electrodes and the vertical circular disc collecting electrodes with a plurality of scrapers;
- wherein the plurality of scrapers are located out of the single main air stream.
Dependencies are inferred from the claim text.