EP1885502A1 - Nettoyeur d'air electrostatique - Google Patents

Nettoyeur d'air electrostatique

Info

Publication number
EP1885502A1
EP1885502A1 EP05744060A EP05744060A EP1885502A1 EP 1885502 A1 EP1885502 A1 EP 1885502A1 EP 05744060 A EP05744060 A EP 05744060A EP 05744060 A EP05744060 A EP 05744060A EP 1885502 A1 EP1885502 A1 EP 1885502A1
Authority
EP
European Patent Office
Prior art keywords
cleaning device
air cleaning
electrodes
electrostatic air
electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05744060A
Other languages
German (de)
English (en)
Other versions
EP1885502A4 (fr
Inventor
Igor A. Krichtafovitch
Vladimir L. Gorobets
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kronos Advanced Technologies Inc
Original Assignee
Kronos Advanced Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kronos Advanced Technologies Inc filed Critical Kronos Advanced Technologies Inc
Publication of EP1885502A1 publication Critical patent/EP1885502A1/fr
Publication of EP1885502A4 publication Critical patent/EP1885502A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/36—Controlling flow of gases or vapour
    • B03C3/361—Controlling flow of gases or vapour by static mechanical means, e.g. deflector
    • B03C3/366—Controlling flow of gases or vapour by static mechanical means, e.g. deflector located in the filter, e.g. special shape of the electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings

Definitions

  • Patent Application Serial Number 10/188,069 filed July 3, 2002 and entitled Electrostatic Fluid Accelerator For And A Method Of Controlling Fluid Flow
  • U.S. Patent Application Serial Number 10/352,193 filed January 28, 2003 and entitled An Electrostatic Fluid Accelerator For Controlling Fluid Flow
  • U.S. Patent Application Serial Number 10/295,869 filed November 18, 2002 and entitled Electrostatic Fluid Accelerator
  • U.S. Patent Application Serial Number xxx,xxx (attorney docket number 432.008/10101579) filed December 2, 2003 and entitled Corona Discharge Electrode And Method Of Operating The Same, each of which is incorporated herein in its entirety by reference.
  • the invention relates to a device for electrostatic air cleaning.
  • the device is based on the corona discharge and ions acceleration along with dust particles charging and collecting them on the oppositely charged electrodes.
  • a number of patents describe electrostatic air cleaning devices that including (i) ion and resultant air acceleration generated by a corona discharge method and device coupled with (ii) charging and collection of airborne particulates, such as dust.
  • These corona discharge devices apply a high voltage potential between corona (discharge) electrodes and collecting (or accelerating) electrodes to create a high intensity electric field and generate a corona discharge in a vicinity of the corona electrodes.
  • Collisions between the ions generated by the corona and surrounding air molecules transfer the momentum of the ions to the air thereby inducing a corresponding movement of the air to achieve an overall movement in a desired air flow direction.
  • U.S. Patent No. 4,689,056 describes the air cleaner of the ionic wind type including corona electrodes constituting a dust collecting arrangement having the collecting electrodes and repelling electrodes alternately arranged downstream of said corona electrode.
  • a high voltage e.g., 10 - 25 kV
  • a power source between the corona electrodes and the collecting electrodes to generate an ionic wind in a direction from the corona electrodes to the collecting electrode.
  • a charge corresponding to the polarity of the corona electrodes is accumulated on these particles such that they are attracted to and accumulate on the oppositely-charged collecting electrodes.
  • Charging and collecting of the particles effectively separates-out particulates such as dust from fluids such as air as it passes through the downstream array of collecting electrodes.
  • the corona electrodes are supplied with a high negative or positive electric potential while the collecting electrodes are maintained at a ground potential (i.e., positive or negative with respect to the corona electrodes) and the repelling electrodes are maintained at a different potential with respect to the collecting electrodes, e.g., an intermediate voltage level.
  • a ground potential i.e., positive or negative with respect to the corona electrodes
  • repelling electrodes are maintained at a different potential with respect to the collecting electrodes, e.g., an intermediate voltage level.
  • a charged particle is attracted to the collecting electrode with a force which is proportional to the electric field strength between the collecting and repelling electrodes' plates:
  • the magnitude of this attractive force is proportional to the electric field and therefore to the potential difference between the collecting and repelling plates and inversely proportional to the distance between these plates.
  • a maximum electric field potential difference is limited by the air electrical dielectric strength, i.e., the breakdown voltage of the fluid whereupon arcing will occur. If the potential difference exceeds some threshold level then an electrical breakdown of the dielectric occurs, resulting in extinguishment of the field and interruption of the air cleaning processing/operations. The most likely region wherein the electrical breakdown might occur is in the vicinity of the edges of the plates where the electric field gradient is greatest such that the electric field generated reaches a maximum value in such regions.
  • particulate removal e.g., air cleaning
  • Another factor limiting particulate removal (e.g., air cleaning) efficiency is caused by the existence of a laminar air flow in-between the collecting and repelling electrodes, this type of flow limiting the speed of charged particle movement toward the plates of the collecting electrodes.
  • Embodiments of the invention address several deficiencies in the prior art such as: poor collecting ability, low electric field strength, charged particles trajectory and resettling of particles back onto the collecting electrodes.
  • the collecting and repelling electrodes have a profile and overall shape that causes additional air movement to be generated in a direction toward the collecting electrodes. This diversion of the air flow is achieved by altering the profile from the typical flat, planar shape and profile with the insertion or incorporation of bulges or ridges.
  • these terms include, but are not limited to, structures that are either (i) contiguous sheet-like structures of substantially uniform thickness formed to include raised portions that are not coplanar with, and extend beyond, a predominant plane of the sheet such as that defined by a major surface of the sheet (e.g., a "skeletonized” structure), and (ii) compound or composite structures of varying thickness including (a) a sheet-like planar portion of substantially uniform thickness defining a predominant plane and (b) one or more "thicker" portions extending outward from the predominant plane (including structures formed integral with and/or on an underlying substrate such as lateral extensions of the planar portion).
  • the bulges or ridges run along a width of the electrodes, substantially transverse (i.e. orthogonal) to the overall airflow direction through the apparatus.
  • the bulges protrude outwardly along a height direction of the electrodes.
  • the bulges may include sheet-like material formed into a ridge or bulge and/or portions of increased electrode thickness.
  • a leading edge of the bulge has a rounded, gradually increasing or sloped profile to minimize and/or avoid disturbance of the airflow (e.g., maintain and/or encourage a laminar flow), while a trailing portion or edge of the bulge disrupts airflow, encouraging airflow separation from the body of the electrode and inducing and/or generating a turbulent flow and/or vortices.
  • the bulges may further create a downstream region of reduced air velocity and/or redirect airflow to enhance removal of dust and other particulates from and collection on the collecting electrodes and further retention thereof.
  • the bulges are preferably located at the ends or edges of the electrodes to prevent a sharp increase of the electric field. Bulges may also be provided along central portions of the electrodes spaced apart from the leading edge.
  • the bulges are shaped to provide a geometry that creates "traps" for particles. These traps should create minimum resistance for the primary airflow and, at the same time, a relatively low velocity zone on a planar portion of the collecting electrode immediately after (i.e., at a trailing edge or "downwind" of) the bulges.
  • Embodiments of the present invention provide an innovative solution to enhancing the air cleaning ability and efficiency of electrostatic fluid (including air) purifier apparatus and systems.
  • the rounded bulges at the ends of the electrodes decrease the electric field around and in the vicinity of these edges while maintaining an electric potential difference and/or gradient between these electrodes at a maximum operational level without generating sparking or arcing.
  • the bulges are also effective to make air movement turbulent. Contrary to prior teachings, a gentle but turbulent movement increases a time period during which a particular charged particle is present between the collecting and repelling electrodes.
  • the "traps" behind the bulges minimize air movement behind (i.e., immediately “downwind” of) the bulges to a substantially zero velocity and, in some situations, results in a reversal of airflow direction in a region of the trap.
  • the reduced and/or reverse air velocity in the regions behind the traps results in those particles that settle in the trap not being disturbed by the primary or dominant airflow (i.e., the main airstream). Minimizing disturbance results in the particles being more likely to lodge in the trap area for some period of time until intentionally removed by an appropriate cleaning process.
  • Figure 1 is a schematic drawing in cross-section of an array of corona, repelling and collecting electrodes forming part of an electrostatic air cleaning the previous art
  • Figure 2 is a schematic drawing in cross-section of an array of electrodes in which the collecting electrodes have a cylindrical bulge portion formed on a leading edge according to an embodiment of the present invention
  • Figure 2 A is a perspective view of the electrode arrangement according to Figure 2;
  • Figure 2B is a schematic drawing in cross-section of an array of electrodes in which the collecting electrodes have a transverse tubular bulge portion formed on a leading edge according to an alternate embodiment of the invention
  • Figure 2C is a schematic drawing in cross-section of an alternate structure of a collecting electrode with a partially open tubular leading edge
  • Figure 3 is a schematic drawing in cross-section of an array of electrodes in which the collecting electrodes have a semi-cylindrical bulge portion formed on a leading edge according to another embodiment of the present invention
  • Figure 3 A is a detailed view of the leading edge of the collecting electrode depicted in Figure 3;
  • Figure 3B is a schematic drawing in cross-section of an array of electrodes in which the collecting electrodes have a flattened tubular portion formed on a leading edge according to another embodiment of the invention;
  • Figure 3C is a detailed view of the leading edge of the collecting electrode depicted in Figure 3B;
  • Figure 3D is a detailed view of an alternate structure for a leading edge of a collecting electrode
  • Figure 4 is a schematic drawing in cross-section of an array of electrodes wherein the collecting electrodes have both a semi-cylindrical bulge portion formed on a leading edge and a wedge-shaped symmetric ramp portion formed along a central portion of the electrodes according to an embodiment of the present invention
  • Figure 4A is a detailed view of the wedge-shaped ramp portion of the collecting electrodes depicted in Figure 4.
  • Figure 4B is a schematic drawing in cross-section of an array of electrodes in which the collecting electrodes have an initial semi-cylindrical bulge, a trailing, plate-like portion of the electrode having a constant thickness formed into a number of ramped and planar portions;
  • Figure 4C is a detailed perspective drawing of the collecting electrode of Figure 4B;
  • Figure 4D is a schematic drawing in cross-section of an alternate "skeletonized" collecting electrode applicable to the configuration of Figure 4B;
  • Figure 5 is a schematic drawing of an array of electrodes including the collecting electrodes of Figure 4 with intervening repelling electrodes having cylindrical bulges formed on both the leading and trailing edges thereof according to another embodiment of the present invention
  • Figure 5 A is a schematic drawing of an array of electrodes including the collecting electrodes of Figure 4C with intervening repelling electrodes having cylindrical bulges as in Figure 5 according to another embodiment of the present invention
  • Figure 5B is a cross-sectional diagram of alternate repelling electrode structures
  • Figure 6 is a schematic drawing of an electrode array structure similar to that of Figure 5 wherein a void is formed in a midsection of each of the repelling electrodes;
  • Figure 7 is a photograph of a stepped electrode structure present along a leading edge of a collecting electrode as diagrammatically depicted in Figure 2.
  • FIG. 1 is a schematic drawing of an array of electrodes that are part of an electrostatic air cleaning device according to the prior art.
  • an electrostatic air cleaning device includes a high voltage power supply 100 connected to an array of electrodes 101 through which a fluid, such as air, is propelled by the action of the electrostatic fields generated by the electrodes, i.e., the corona discharge created by corona electrodes 102 accelerating air toward oppositely charged collecting electrodes 103.
  • the electrodes are connected to a suitable source of a high voltage
  • the array of electrodes includes three groups: (i) a subarray of laterally spaced, wire-like corona electrodes 102 (two are shown) which array is longitudinally spaced from (ii) a subarray of laterally spaced, plate-like collecting electrodes 103 (three are shown) while (iii) a subarray of plate-like repelling electrodes 104 (two are shown) are located in-between of and laterally dispersed between collecting electrodes 103.
  • a high voltage power supply (not shown) provides the electrical potential difference between corona electrodes 102 and collecting electrodes 103 so that a corona discharge is generated around corona electrodes 102.
  • corona electrodes 102 generate ions that are accelerated toward collecting electrodes 103 thus causing the ambient air to move in an overall or predominant desired direction indicated by arrow 105.
  • various types of particulates such as dust (i.e., "dirty air") enters the arrays from a device inlet portion (i.e., from the left as shown in Figure 1 so as to initially encounter corona electrodes 102) dust particles are charged by ions emitted by corona electrodes 102. The now charged dust particles enter the passage between collecting electrodes 103 and the repelling electrodes 104.
  • Repelling electrodes 104 are connected to a suitable power source so that they are maintained at a different electrical potential than are collecting electrodes 103, for example, a voltage intermediate or halfway between corona electrodes 102 and collecting electrodes 103.
  • the difference in potential causes the associated electric field generated between these electrodes to accelerate the charged dust particles away from repelling electrodes 104 and toward collecting electrodes 103.
  • the resultant movement toward collecting electrodes 103 occurs
  • FIG. 2 shows an embodiment of the present invention wherein the geometry of the collecting electrodes is modified to redirect airflow in a manner enhancing collection and retention of particulates on and by the collecting electrodes.
  • an electrostatic air cleaning device include an array of electrodes 201 including the same grouping of electrodes as explained in connection with Figure 1, i.e. wire-like corona electrodes 102, collecting electrodes 203 and repelling electrodes 204.
  • Collecting electrodes 203 are substantially planar, i.e., "plate-like" electrodes with a substantially planar portion 206 but having cylinder-shaped bulges 207 at their leading edges, i.e., the portion of the collecting electrodes nearest corona electrodes 102 is in the form of a cylindrical solid.
  • Corona electrodes 102, collecting electrodes 203 and repelling electrodes 204 are connected to an appropriate source of high voltages such as high voltage power supply 100 ( Figure 1). Corona electrodes 102 are connected so as to be maintained at a potential difference of 10 - 25 kV with reference to collecting electrodes 203 with repelling electrodes 204 maintained at some intermediate potential. Note that the electrical potential difference between the electrodes is important to device operation rather than absolute potentials. For example, any of the sets of electrodes may be maintained near or at some arbitrary ground reference potential as may be desirable or preferred for any number of reasons including, for example, ease of power distribution, safety, protection from inadvertent contact with other structures and/or users, minimizing particular hazards associated with particular structures, etc.
  • the type of power applied may also vary such as to include some pulsating or alternating current and/or voltage component and/or relationship between such components and a constant or d.c. component of the applied power as described in one or more of the previously referenced patent applications and/or as may be described by the prior art. Still other mechanisms may be included for controlling operation of the device and performing other functions such as, for example, applying a heating current to the corona electrodes to rejuvenate the material of the electrodes by removing oxidation and/or contaminants formed and/or collecting thereon, as described in the cited related patent applications.
  • Figure 2 The arrangement of Figure 2 is further depicted in the perspective view shown in Figure 2A, although the width of collecting electrodes 203 and repelling electrodes 204 in the transverse direction (i.e., into the paper) is abbreviated for simplicity of illustration. As depicted therein, particulates 210 such as dust are
  • the geometry of collecting electrodes 203 results in an enhanced dust collection capability and efficiency of dust removal.
  • the enhanced efficiency is due at least in part to the altered airflow becomes turbulent in a region 208 behind cylinder-shaped bulges 207 and enters into a quiet zone 209 where charged particles settle down onto the surfaces of collecting electrodes 203 (Figure 2A).
  • planar portion 206 may exhibit a relatively high Reynolds number Rei (e.g., Re i ⁇ 100, preferably Re i > 1000), a relatively low Reynolds number Re 2 in turbulent region 208 and/or quiet zone (e.g., Re 2 ⁇ 100 and, preferably Re 2 ⁇ 10 and more preferably Re 2 ⁇ 5).
  • Figure 2B depicts and alternate construction, collecting electrodes 203 A having a skeletonized construction comprising a contiguous sheet of material (e.g., an appropriate metal, metal alloy, layered structure, etc.) of substantially uniform thickness that has been formed (e.g., bent such as by stamping) to form a leading closed or open tubular bulge 207A along a leading (i.e., "upwind") edge of collecting electrodes 203 A.
  • a leading closed or open tubular bulge 207A along a leading (i.e., "upwind") edge of collecting electrodes 203 A.
  • tubular bulge 207A is depicted in Figure 2B as substantially closed along its length, it may instead be formed to include open
  • cylindrical bulge 207B might only subtend 270 degrees or less so that the cylindrical outer surface is present facing air moving in the dominant airflow direction but is open toward the rear.
  • collecting electrodes 303 have a semi- cylindrical bulge 307 formed on a leading edge of the electrode, the remaining, downwind portion comprising a substantially planar or plate-like portion 306.
  • Semi- cylindrical bulge 307 includes a curved leading edge 311 and a flat downwind edge 312 that joins planar portion 306.
  • a nominal diameter of curved leading edge 311 would again be greater than the thickness of planar portion 311, and preferably two or three time that dimension.
  • downwind edge 312 is shown as a substantially flat wall perpendicular to planar portion 306, other form factors and geometries may be used, preferably such that downwind edge 312 is within a circular region 313 defined by the extended cylinder coincident with curved leading edge 311 as shown in Figure 3 A.
  • Downwind edge 312 should provide an abrupt transition so as to encourage turbulent flow and/or shield some portion of semi-cylindrical bulge 307 (or that of other bulge geometries, e.g., semi-elliptical) and/or section of planar portion 306 from direct and full- velocity predominant airflow to form a collecting or quiet zone.
  • Establishment of a collecting or/or quiet zone 309 enhances collection efficiency and provide an environment conducive to dust settlement and retention.
  • FIG. 3B A skeletonized version of a collecting electrode is depicted in Figures 3B, 3C and 3D. As shown in Figures 3B and 3C, collecting electrode 303A includes
  • leading edge 307A formed as a half-round tubular portion that is substantially closed except at the lateral edges, i.e., at the opposite far ends of the tube.
  • downwind walls 312A and 312B are substantially complete.
  • leading edge 307B is formed as an open, i.e., instead of a wall, a open slit or aperture 312D runs the width of the electrode, only downwind wall 312C being present.
  • FIG. 4 and 4 A Another embodiment of the invention is depicted in Figures 4 and 4 A wherein, in addition to bulges 407 (in this case, semi-cylindrical solid in shape) formed along the leading edge of collecting electrode 403, additional "dust traps" 414 are formed downwind of the leading edge of collecting electrode 403 creating additional quite zones.
  • the additional quiet zones 409 formed by dust traps 414 further improve a particulate removal efficiency of the collecting electrodes and that of the overall device.
  • dust traps 414 may be symmetrical wedge portions having ramp portions 415 positioned on opposite surfaces of collecting electrodes 403 in an area otherwise constituting a planar portion of the electrode.
  • Opposing ramp portions 415 rise outwardly from a planar portion of the electrode, ramp portions 415 terminating at walls 416.
  • the slope of ramp portions 415 may be on the order of 1:1 (i.e., 45°), more preferably having a rise of no greater than 1 :2 (i.e., 25° - 30°) and, even more preferably greater than 1 :3 (i.e., ⁇ 15° to 20°).
  • Ramp portions 415 may extend to an elevation of at least one electrode thickness in height above planar portion 406, more preferably to a height at least two electrode thicknesses, although even greater heights may be appropriate (e.g., rising to a height at least three times that of a collecting electrode thickness).
  • planar portion 406 is 1 mm thick, then dust traps 414 may rise 1, 2, 3 or more millimeters.
  • Quite zone 409 is formed in a region downwind or behind walls 416 by the redirection of airflow caused by dust trap 414 as air is relatively gently redirected along ramp portions 415. At the relatively abrupt transition of walls 416, a region of turbulent airflow is created. To affect turbulent airflow, walls 416 may be formed with a concave geometry within region 413.
  • dust traps 414 are shown as a symmetrical wedge with opposing ramps located on either side of collecting electrodes 403, an asymmetrical construction may be implemented with a ramped portion located on only one surface.
  • multiple dust traps may be incorporated including dust traps on alternating surfaces of each collecting electrode.
  • the dust traps as shown shaped as wedges other configuration may be used including, for example, semi-cylindrical geometries similar to that shown for leading edge bulges 407.
  • Dust traps may also be created by forming a uniform-thickness plate into a desired shape instead using a planar substrate having various structures formed thereon resulting in variations of a thickness of an electrode.
  • collecting electrodes 403A may comprise an initial semi- cylindrical bulge 407 formed as a semi-cylindrical solid on the leading edge of a plate, the plate being bent or otherwise formed to include planar portions 406 and dust traps 414A.
  • dust traps 414A comprise a metal plate that is the same thickness as the other, adjacent portions of the electrode, i.e., planar portions 406.
  • the dust traps may be formed by any number of processes such as by stamping, etc.
  • FIG. 4D A fully skeletonized version of a collecting electrode 403B is depicted in Figure 4D wherein bulge 407 A is formed as a half-round tube having it curved
  • Bulges 507 serve two purposes.
  • the bulges both create additional air turbulence and increase the electric field strength in the areas between bulges 414 of collecting electrodes 403. That increased electric field "pushes" charged particles toward the collecting electrodes 403 and increases the probability that particulates present in the air (e.g., dust) will settle and remain on the surfaces of collecting electrodes 403.
  • Figure 5 A depicts a variation of the structure of Figure 5 wherein a partially skeletonized form of collecting electrode 403 A as depicted in and discussed with reference to Figures 4B and 4C is substituted for the collecting electrode structure of Figure 4 A.
  • repelling electrodes 604 have voids or apertures 619 (i.e., "breaks") through the body of the electrode, the voids preferably aligned and coincident with bulges 414 of collecting electrodes 403.
  • apertures 619 are aligned with bulges 414 such that an opening in the repelling electrode starts at or slightly after (i.e., downwind of) an initial upwind portion of an adjacent bulge (in, for example, a collecting electrode), the aperture terminating at a position at or slightly after a terminal downwind portion or edge of the bulge.
  • apertures 619 are depicted with a particular geometry for purposes of illustration, the aperture may be made with various modification including a wide range of holes and slots.
  • Apertures 619 further encourage turbulent airflow and otherwise enhance particulate removal. At the same time, this configuration avoids generation of an excessive electric field increase that might otherwise be caused by the proximity of the sharp edges of the bulges 414 to the repelling electrodes 604.
  • round or cylindrical shaped bulges 517 and 607 are located at the far upstream (leading edge) and downstream (trailing edge) ends of the repelling electrodes 504 and 604 respectively. This configuration reduces the probability of occurrence of an electrical breakdown between the edges of the repelling electrodes and the collecting electrodes, particularly in comparison with locating such bulges near a middle of the electrodes. Experimental data has shown that the potential difference between the repelling and collecting electrodes is a significant factor in maximizing device dust collection efficiency. The present
  • downstream or trailing edges of repelling electrodes 604 are inside that of collecting electrodes 403, i.e., the outlet edges are located closer to the inlet than the outlet edges of the collecting electrodes. This relationship further enhances a dust collecting ability while decreasing or minimizing a flow of ions out through the outlet or exhaust of the array and the device.
  • Figure 7 is a photograph of a collecting electrode structure corresponding to Figure 2 wherein multiple layers of conductive material are layered to produce a rounded leading edge structure.

Landscapes

  • Electrostatic Separation (AREA)

Abstract

Ce nettoyeur d'air électrostatique comporte une matrice (201) d'électrodes et notamment d'électrodes de type corona (102) branchées sur une source appropriée (100) de haute tension pour la production d'effluve. Des électrodes collectrices latéralement déplacées (203) comporte des bosselures (207) portant des surfaces au vent antérieures aérodynamiques et des bords de fuite à rupture des flux sous le vent créant des zones tranquilles (209) permettant de recueillir les particules extraites de l'air. Les bosselures (207) peuvent avoir la forme de bords d'attaque arrondis sur les électrodes collectrices (203) et/ou de surfaces en plan incliné (415) situées, par exemple, à mi-longueur des électrodes. Des électrodes réflectrices (104) entre deux électrodes collectrices (203) peuvent comporter des bosselures identiques et notamment des bords d'attaque et/ou de fuite (517) cylindriques ou semi-cylindriques.
EP05744060A 2005-04-29 2005-04-29 Nettoyeur d'air electrostatique Withdrawn EP1885502A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2005/014934 WO2006135353A1 (fr) 2005-04-29 2005-04-29 Nettoyeur d'air electrostatique

Publications (2)

Publication Number Publication Date
EP1885502A1 true EP1885502A1 (fr) 2008-02-13
EP1885502A4 EP1885502A4 (fr) 2010-12-15

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Country Status (8)

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EP (1) EP1885502A4 (fr)
JP (1) JP2008539067A (fr)
CN (1) CN101213025A (fr)
AU (1) AU2005333037A1 (fr)
CA (1) CA2611186A1 (fr)
EA (1) EA012251B1 (fr)
MX (1) MX2007013382A (fr)
WO (1) WO2006135353A1 (fr)

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WO2010091694A1 (fr) * 2009-02-10 2010-08-19 Stadler Form Aktiengesellschaft Épurateur d'air électrostatique
JP5879470B2 (ja) * 2010-01-18 2016-03-08 パナソニックＩｐマネジメント株式会社 集塵装置
CN201688515U (zh) * 2010-03-31 2010-12-29 苏州贝昂科技有限公司 内嵌空气净化系统的空调
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CN103008106B (zh) * 2012-12-28 2015-04-08 苏州贝昂科技有限公司 一种气体净化装置及系统
WO2014194813A1 (fr) * 2013-06-04 2014-12-11 苏州贝昂科技有限公司 Purificateur d'air par ions, contrôle de décharge et circuit de protection sur un purificateur par ions à haute tension
CN104607314A (zh) * 2013-11-01 2015-05-13 珠海格力电器股份有限公司 一种油烟捕集装置及油烟机
CN105934279B (zh) * 2014-03-07 2018-11-16 富士通将军股份有限公司 静电集尘装置以及利用该静电集尘装置的空调设备
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WO2006135353A1 (fr) 2006-12-21
EA200702391A1 (ru) 2008-04-28
MX2007013382A (es) 2008-01-18
AU2005333037A1 (en) 2006-12-21
CN101213025A (zh) 2008-07-02
CA2611186A1 (fr) 2006-12-21
EA012251B1 (ru) 2009-08-28
JP2008539067A (ja) 2008-11-13
EP1885502A4 (fr) 2010-12-15

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