Devices for removing particles from a gas comprising an electrostatic precipitator
OwnerSik Leung Chaninventor
Life of this patent
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Abstract
Air or gas cleaners enhance the uniformity of the current density between an emitter and one or more receptor electrodes by positioning one or more insulators or effective resistors between the emitter and the receptor electrode. Insulators and/or effective resistors are used to shield select portions, e.g. the edges of plate-type receptor electrodes, from ionization current flowing between an emitter and unshielded portions. This allows more compact structures without ionization current concentrations at the shielded regions, and results in lower ozone generation for a given particle collection efficiency.
Claims68
A device for removing particles from a gas comprising an electrostatic precipitator comprising:
- at least one emitter and at least one receptor electrode spaced from said emitter;
- said receptor electrode comprising a shielded region comprising at least a first surface, said shielded region comprising at least one of a change of curvature or a change in continuity of said surface;
- said receptor electrode also comprising an unshielded region;
- means for maintaining said emitter and said receptor electrode at different voltage potentials sufficient to create an ionization current between said emitter and at least a portion of said unshielded region of said receptor electrode;
- and
- at least one effective resistor positioned between said emitter and said shielded region of said receptor electrode to shield said shielded region from said ionization current.
A device for removing particles from a gas comprising an electrostatic precipitator comprising:
- at least one emitter and at least one receptor electrode spaced from said emitter;
- said receptor electrode comprising a shielded region comprising at least a portion of a first surface, wherein said portion of said first surface does not comprise a change in curvature or a change in continuity;
- said receptor electrode also comprising an unshielded region positioned downstream of said shielded region;
- means for maintaining said emitter and said receptor electrode at different voltage potentials sufficient to create an ionization current between said emitter and at least a portion of said unshielded region of said receptor electrode;
- and
- at least one effective resistor positioned between said emitter and said shielded region to shield said shielded region from said ionization current.
A device for removing particles from a gas comprising an electrostatic precipitator comprising:
- at least one emitter and at least one receptor/collector electrode spaced from said emitter;
- said receptor/collector electrode comprising a shielded region comprising at least a portion of a first surface, wherein said portion of said first surface comprises the portion of said receptor/collector electrode which is closest to said emitter and said portion of said first surface does not comprise a change in curvature or a change in continuity;
- said receptor/collector electrode also comprising an unshielded region positioned downstream of said shielded region;
- means for maintaining said emitter and said receptor/collector electrode at different voltage potentials sufficient to create an ionization current between said emitter and at least a portion of said unshielded region ;
- and
- at least one effective resistor positioned between said emitter and said shielded region to shield said shielded region from said ionization current.
A device for removing particles from a gas comprising an electrostatic precipitator comprising:
- at least one emitter and at least one receptor/collector electrode spaced from said emitter;
- said receptor/collector electrode comprising a shielded region comprising at least a portion of a first surface, wherein said portion of said first surface comprises the portion of said receptor/collector electrode which is closest to said emitter and said shielded portion comprises a change in curvature or a change in continuity;
- said receptor/collector electrode also comprising an unshielded region positioned downstream of said shielded region relative to the flow of the gas;
- means for maintaining said emitter and said receptor/collector electrode at different voltage potentials sufficient to create an ionization current between said emitter and at least a portion of said unshielded region of said receptor/collector electrode;
- and
- at least one effective resistor material positioned between said emitter and said shielded region to shield said shielded region from said ionization current.
A portable, self-contained air cleaner comprising an electrostatic precipitator comprising:
- at least one wire emitter;
- at least one plate-type receptor electrode spaced from said emitter, said receptor electrode comprising a shielded region comprising at least a first surface, said shielded region comprising at least one of a change of curvature or a change in continuity of said surface and wherein a portion of said shielded region is the closest portion of said receptor electrode to said emitter;
- said receptor electrode also comprising an unshielded region;
- means for maintaining said emitter and said receptor electrode at different voltage potentials sufficient to create an ionization current between said emitter and at least a portion of said unshielded region of said receptor electrode;
- and
- insulation positioned between said emitter and said shielded region to shield said shielded region from said ionization current.
A device for removing particles from a gas comprising an electrostatic precipitator comprising:
- a plurality of emitters,
- a plurality of receptor electrodes;
- a high voltage power supply electrically connected to said plurality of emitters;
- a plurality of resistors, wherein different resistors are disposed between said power supply and different emitters.
Dependencies are inferred from the claim text.