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US20040035292: Grid type electrostatic separator/collector and method of using same

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Filing Information

Inventor(s) John Dunn ·
Assignee(s) None listed in document.
Correspondent BROWN & MICHAELS, PC 400 M & T BANK BUILDING ·
Application Number US10225523
Filing date 08/21/2002
Publication date 02/26/2004
Predicted expiration date 08/21/2022
U.S. Classifications 95/57  · 96/75  · 96/15  ·
International Classifications B03C003/00  ·
Kind CodeA1
26 Claims, 10 Drawings


Abstract

An electrical type grid electrostatic collector/separator removes particles from an air stream. The apparatus includes multiple parallel grids that act as the porous material, enclosed in a sealed compartment so that the entrained air flows parallel and between one or more centrally located grids. A direct current high voltage field is established between the grids with the polarities alternating between facing grids. The system is preferably used for conductive and semi-conductive materials because of the ease at which the particles can receive an induced charge. The charged particles are separated and collected when they are attracted toward the relatively open wire or woven grids and pass laterally through and onto the next attracting grid until they are out of the air stream and generally fall by gravity to the collection vessel. When non-conductive particles are present, external methods of pre-charging by corona discharge are preferably used. When non-conductive particles are present, both internal and external methods of pre-charging by corona discharge are used with the external method being preferred.

Independent Claims | See all claims (26)

  1. 1. A method of removing particles from an air stream, comprising the step of passing the air stream between a plurality of grid electrodes, each grid electrode having an opposite polarity as the grid electrodes adjacent to it such that an attractive field is created and the particles pass through at least one grid electrode.
  2. 7. A method of removing particles from an air stream, comprising the step of passing the air stream over a modified-U-shaped electrode and between a plurality of grid electrodes, each grid electrode having an opposite polarity as the grid electrodes adjacent to it such that an attractive field is created and the particles pass through at least one grid electrode.
  3. 13. An apparatus for removing particles from an air stream, comprising: a) an input for the air stream entering the apparatus; b) an output located on an opposite side of the apparatus from the input, wherein the air stream exits the apparatus at the output; and c) a plurality of grid electrodes located between the input and the output; such that when opposite charges are applied to adjacent grid electrodes, an attractive field is created and the particles in the air stream pass through at least one grid electrode.
  4. 20. An apparatus for removing entrained, charged non-conductive particles comprising: a) an input for the air stream entering the apparatus; b) an output located on an opposite side of the apparatus from the input, wherein the air stream exits the apparatus at the output; c) a plurality of grid electrodes located between the input and the output; d) at least one corona discharge electrode located parallel to the grid electrodes; and c) at least one collecting plate electrode located between the input and the output and outside the grid electrodes; such that, when the corona discharge electrodes, the parallel grid electrodes, and the collecting plate electrode are electrically active, the particles pass through the grid electrodes while the gas continues to flow out of the system.
  5. 21. A method of removing particles from an air stream, comprising the step of passing the air stream over a cone shaped electrode and between a plurality of grid electrodes, each grid electrode having an opposite polarity to adjacent grid electrodes, such that an attractive field is created and the particles pass through at least one grid electrode.

References Cited

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Referenced By

Document NumberAssigneeInventorsIssue/Pub Date
US7105041 DUNN JOHN P John P. Dunn Sep 2006
US7585352 John P. Dunn Sep 2009
US8252373 International Paper Company Jay C. Song et al. Aug 2012

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