US3704572A - Electrostatic precipitator system - Google Patents

Electrostatic precipitator system Download PDF

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Publication number
US3704572A
US3704572A US37714A US3704572DA US3704572A US 3704572 A US3704572 A US 3704572A US 37714 A US37714 A US 37714A US 3704572D A US3704572D A US 3704572DA US 3704572 A US3704572 A US 3704572A
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members
electrode
electrode member
collector
electrostatic precipitator
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US37714A
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Meredith C Gourdine
Howard A Sayers
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Energy Innovations Inc
Gourdine Systems Inc
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Gourdine Systems Inc
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Assigned to MALIN, JOEL reassignment MALIN, JOEL AS COLLATORAL SECURITY, ASSIGNOR ASSIGNS THE ENTIRE INTEREST UNDER SAID PATENT RIGHTS. (SEE DOCUMENT FOR DETAILS) Assignors: ENERGY INNOVATIONS, INC.
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    • 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
    • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations

Definitions

  • ABSTRACT An improved electrostatic precipitator device capable of significant size reduction having flat parallel plates consisting of an ionizing corona discharge portion as a unitary structure which is utilized to effectuate precipitation of entrained particles from an air stream onto the surface of a plurality of associated collection members, as an air stream containing entrained particles is cleaned in passing through the precipitator device.
  • the ionizer discharge portion of the unitary structure comprises a plurality of substantially uniformly spaced apart sharp electrical conductive protrusions directed to alternate sides of the unitary structure; thereby forming a uniform ionization region with a parallel portion of the collector extending the full length of the ionizer.
  • the remainder of each of the unitary structure functions as a passive electrode which cooperates with the remaining portion of the collector to form'highly concentrated electrostatic fields therebetween for enhanced collection efficiency with minimum re-entrainment of the particles to be collected.
  • the ionizer electrodes most widely and usually used for such precipitators consist of a plurality of very fine (small-diameter) wires, spacedapart and spaced between relatively widely spaced nondischarging electrodes, commonly known as attractor electrodes.
  • the non-discharging attractor electrodes have been either curved towards or away from the wires, or substantially flat, plate surfaces. In many cases, the flat plates are preferred for the nondischarge electrodes, since they are simpler, less expensive and easier to assemble and clean.
  • the present invention overcomes several obvious disadvantages of the prior art arrangements, one of which arises from the fact that the ionization regions and the precipitation (collection) regions are in separate chambers. Another disadvantage occurs as a result of the charged particles precipitating out onto the surrounding walls of the attractor electrode, that is, the walls of the attractor electrode adjacent to the ionizer electrode in areas which are not accessible for cleaning. Precipitation of particles on the attractor walls in the ionizer section tends to reduce the ionization level in the ionizer region, which in turn, reduces the effectiveness and efficiency for charging the entrained particles in the air stream.
  • Still another apparent disadvantage of the prior art arrangement of having the ionizer and collection chamber separated arises from the fact that such arrangements may cause the precipitator to be larger in size than may be desired or required to handle a preselected volume of air to be cleaned. More specifically, in certain applications for example, in a home kitchen range hood air cleaner utilized for cleaning the air in a kitchen, which has become polluted from the cooking process, it has been found for many years to be uneconomical and also requires too much space in the kitchen area to make it feasible to employ such large size prior art precipitators as a means for removing such air pollutants as smoke,.grease particles, and odor from the kitchen environmental air, solely because of the large physical size requirements for such purposes with prior art devices.
  • the air cleaning precipitator device is constructed such that the ionization and the collector regions comprise what may be termed as a continuous system, without a transition region between such functional chambers.
  • the precipitator comprises at least one unitary substantially flat plate member, essentially consisting of an ionizer electrode section, extending toward the upstream end of the precipitator and a passive electrode section, extending from the ionizer section toward the downstream end of the precipitator.
  • a substantially parallel and co-extensive collector electrode having an upstream portion thereof which extends past the ionizer electrode on opposite sides thereof in the direction opposite to the incoming air stream.
  • a corona discharge In the region between the upstream end of the collector electrodes, adjacent to the ionizer there is formed a corona discharge, whereby the entrained particles in the air stream are charged.
  • the ionizer and passive electrodes are at the same electrical potential with respect to ground and polarity, while the collector electrodes are at a different electrical potential with respect to ground and polarity than the corona and passive electrodes. In many instances the collector electrodes are at ground potential. These differences in polarities and potential cause a corona discharge and electrostatic fields to be formed, respectively, between the ionizer and the upstream end of the collector and between the passive electrode and the remainder of the collector for enchanced collection efficiency and to substantially reduce particle re-entrainment.
  • precipitators operated and constructed in accordance with the present invention are capable of precipitating particles of both large and small (submicron) sizes, produced during the process of cooking foods. Still further, it has been observed by olfactory or smelling tests, that the odor levels produced during cooking processes are significantly reduced. A complete understanding of these observations can not be readily explained; however, it is believed that the close proximity of the ionization and collection regions in the precipitator enables more efficient charging and collection of these large size particles or the agglomeration of small particles to which gaseous odor attach and are removed. This has not heretofore effectively been done.
  • a further explanation of the precipitation process is based upon the belief that the collection of both large and small particles is in part due to turbulence created in the ionizer region which is evidenced by an enhancement of the corona wind produced therein.
  • the unitary ionizer and passive collector electrodes are each constructed in the form of unitary structures in an interleaved manner.
  • the combination ionizer and passive electrode structure is disposed within the precipitator in a fashion so as to avoid possible collection of particles thereon and thereby reducing, if not eliminating, the occurrence of shorting out of the combined ionizer and passive electrode structural member.
  • a precipitator device may be constructed in a significantly smaller-size volume unit, while still being capable. of handling as large a volume of air to be cleaned of pollutants as that of the prior art two-chamber devices. Still further, the unitary combination structure for an ionizer and passive electrode is adaptable to multiple-stage arrangements in a minimum amount of space to add greater air cleaning efficiency.
  • FIG. 2 is a diagramatic cross-section, illustrating a top view of an embodiment of the invention
  • FIG. 3 is a diamgramatic cross-sectional view taken along line 33 of FIG. 2, illustrating a side view;
  • FIG. 4 is a diagramatic cross-sectional view taken along line 4-4 of FIG. 3, illustrating a back view
  • FIG. 5 is a diagramatic cross-section, illustrating another embodiment of the invention.
  • FIG. 6 is a diagramatic cross-sectional view taken along line 66 of FIG. 5, illustrating a side view.
  • FIG. 1 a representative embodiment of an electrostatic air cleaning precipitator constructed in accordance with the present invention is included as a component device of a ventilator air cleaning precipitator system.
  • the precipitator system 10 includes first and second filters 12 and 14, a blower fan '16, and a precipitator device 18, having an associated sump 20, for collecting liquids.
  • the first and second filters, the fan and precipitator device are disposed along a path 22 of an incoming air stream, illustrated as a pollutant air source 24, containing entrained particles and odors to be removed.
  • entrained particles may be in the form of dust, grease, steam, smoke, pollen, and the like, many of which may be of the submicron size.
  • an electrical source of alternating current (A.C.) power 26 push-button interlock switches 28 and 30, respectively, for interconnecting with a direct current (DC) power supply 32 and fan 16.
  • A.C. alternating current
  • DC direct current
  • the DC. powersupply 32 is connected to precipitator device 18, through a convenientcircuit disconnect 34, along conductor 36, while the precipitator is grounded by conductor 38, and the power supply 32 is grounded by conductor 31.
  • the operation of the system is initiated by closing the switch 30 to connect A.C. source. 26 to fan 16.
  • the fan draws pollutant air 24 into the system along path 22, through the first and second filters l2 and 14.
  • the filters are not absolutely required for suitable operation but'may be preferred for certain applications.
  • the partially filtered air is then blown into the inlet end of the precipitator l8, and is exhausted out through the outlet end thereof after having been cleaned.
  • the manner in which the precipitator 18 is constructed and operates will be discussed in greater detail with reference to FIGS. 2-4.
  • the precipitator 18, which includes four insulator frame members 40-46, connected to form a rectangular support frame 48.
  • a plurality of parallel disposed spaced apart elements essentially comprised of alternately spaced conductive substantially flat collector plate members 50, which are electrically interconnected by grounding bridge wire 52 (see FIG. 4) a plurality of unitary plate members 54, each having an ionizer electrode 56 at the upstream and and a passive electrode 58 extending from the ionizer electrode 56 to the downstream end.
  • the upstream end of the device is adjacent to the incoming air, while the downstream end is near the exhaust air outlet.
  • Each of the unitary plate members 54 is electrically interconnected by a bridging conductive member 60.
  • each unitary plate member 54 is electrically insulated from each collector electrode by a series of grooved insulation support members 62, which extend the full length of the frame 48 (also see FIG. 3).
  • These insulative support members 62 are positioned at both the top and the bottom of the frame 48, adjacent frame members 40 and 44. However, it should be recognized that these insulative support members 62 may be included as an integral part of adjacent frame members 40 and 44.
  • a saw-toothed edge member 64 forms the active corona discharge tips or points for the electrode.
  • the present ionizer electrode is provided with multiple corona discharge points, for which the corona discharge may advantageously be maintained.
  • the saw-blade configuration of the ionizer electrode has a set, that is, alternate teeth of the sawblade member point to opposite sides of the corona discharge region.
  • the unique-feature of the set in the corona teeth or tips of the corona electrode 64 enable the corona discharge to be substantially uniformly distributed in a fixed manner along the entire length of the structure and corona discharge region.
  • the individual teeth of the saw-blade structure are capable of substantially independent operation, and, thereby providing a structure of novel functional capabilities.
  • the saw-blade configuration 64 of the present invention provides several advantages. Firstly, it provides multiple needle points for independent high current paths, such that any entrained particles which may be collected thereon may be burned off readily by high currents drawn by the points of the teeth.
  • the needle points are staggered from point to point, such that substantially fixed uniform corona discharge exists along the entire length on either side thereof when negative corona is utilized whereas, if the corona electrode was a fine wire the corona discharge therealong when negative corona is utilized would not always be in fixed positions, but would vary in their position depending on whether or not there was a build-up of impurities on the wire, thereby causing a significant degradation of performance.
  • the ends of the needle points are located outward of the sides of the plate members 54 so as to be closer to the collector electrodes 50 than any other point on the plate members 54. This prevents or greatly deters the creation of corona conditions between impurities settling on downstream areas of the plate members 54 and the opposed collectors 50, and thereby further ensures proper ionizer performance.
  • the precipitator device 18 may be considered completed by the presence of a grounding shim 66, which is shown in FIG. 3, as being connected to conductor 38, and then to ground potential.
  • the grounding shim 66 is connected to all of the collector electrodes 50, so as to place them at ground potential with respect to the polarity of the unitary member electrodes 54, which are connected to another polarity with respect to ground by conductor 36, which is connected to the DC. power supply 32.
  • the DC. power supply is also grounded on one side.
  • the polarity of the ionizer may be either positive or negative with respect to ground for operation. However, in practical operation of the precipitator, it has been found that the use of a negative potential is preferred.
  • the precipitator device 18 in the representative embodiment of FIGS. 2-4, has the unitary members 54, including the ionizer 56 and the passive electrode 58, at a negative potential with respect to ground potential and the collector electrodes 50, which, as noted, are connected to ground potential by means of shim 66 and conductor 38.
  • Such connections produce a negative corona discharge in the upstream portion of the device between the saw-blade teeth section 64 of the ionizer 56 and the upstream end of collector electrode 50. Between the passive electrode 58 and the remainder of the collector electrodes 50, there is produced a strong electric field on the non-corona discharge type.
  • the larger particles acquire their charge by electric field charging, while the smaller particles, such as submicron particles, acquire their charge principally by diffusion charging.
  • FIGS. 5 and 6 there is shown another embodiment of the invention wherein the precipitator 18 has disposed therein a unitary structure 70, including a plurality of combination ionizers 56 and passive electrodes 58, and a unitary structure 72, in cluding a plurality of collector electrodes 50 forming an interleaving arrangement therebetween.
  • the unitary structure 70 is disposed within the precipitator 18 by at least two stand-off electrical connectors 74 which are supported by a housing enclosure 76 of the precipitator. Connected to one of the connectors 74 is a cable 77, including the conductor 36, for applying a DC.
  • a deflection baffle 78 disposed in the upstream end of the precipitator l8 and a sump as an integral component of the precipitator 18 with a plurality of gravity-flow apertures 80 opening into the sump 20 for permitting the flow of liquids from the precipitation region to the sump.
  • the sump 20 is in the form of a drawer, is slidably removable by pulling a knob 82, and is guided along support guide grooves 84.
  • Baffle 78 may be deflected at an angleto the flow of air through the device, and has been disposed with respect to the ionizer 56 and passive electrode 58 to prevent any air from flowing along a path indicated by a curved broken-line arrow 88. This arrangement insures that no entrained airborne particles are collected on top of the unitary structure 70, where they may cause shorting between structure 70 and the enclosure 76, which is at ground potential while the structure 70 may be at high negative potential.
  • the present invention has several additional advantages over prior art precipitator arrangements. The most noticeable one being its ability to collect particles of all sizes more effectively and efficiently in a smaller package. Another advantage of the invention is the elimination of the two-chamber precipitator arrangements, which enable the device to be built economically and compactly, in contrast to prior art devices. Precipitators in accordance with the present invention have been built,
  • the precipitator in accordance with the present invention, is capable of cleaning approximately five times as much air per unit time per unit cross-sectional area as prior-art commercial air cleaning apparatus.
  • Still another advantage may be derived from the present invention, namely, that of making the precipitator a multiple-stage device by placing two or more of the unitary plate members 54 in series, such that the upstream end of the passive electrode is far enough removed from the next succeeding ionizer sawblade element 64 not to interfere with the corona discharge to be produced with such positioning.
  • it may be highly desirable to utilize such a multiple-stage precipitator, such as, for example, where greater air volume capability is required along with minimum volume and size of precipitator device.
  • the efficiency of the precipitator may be increased by staging the unitary plate members in series along the flow path of air while capacity in terms of cubic inches of flow per minute (CFM) may be increased by adding units in parallel to the flow path of the air stream.
  • CFM cubic inches of flow per minute
  • An electrostatic precipitator for removing particles entrained in a fluid stream comprising;
  • a housing having a fluid inlet and a fluid outlet and forming therebetween a flow path for the fluid stream
  • At least one plate electrode member positioned transversely of the flow path and extending ina direction generally parallel to the direction of flow from an upstream end adjacent the fluidinlet to a downstream end adjacent the fluid outlet;
  • each plate electrode member a plurality of pointed members spaced along the upstream end of each plate electrode member and extending upstream therefrom at an acute angle to the longitudinal centerline of the electrode member, said pointed members being symmetrically disposed on opposite sides of said longitudinal centerline;
  • each collector electrode positioned on either side of each plate electrode member in generally parallel relation thereto, each collector electrode having an upstream end located upstream of the pointed members of the adjacent plate electrode member and a downstream end located adjacent the downstream end of said plate electrode member;
  • each plate electrode member means for establishing a potential difference between each plate electrode member and the adjacent collector electrodes productive of (1) a corona discharge between each pointed member and the opposed region of each collector electrode that is directed in substantial part against the direction of flow and (2) a nondischarging precipitation field between the region of each plate electrode member downstream of the pointed members and the opposed region of each collector electrode.
  • An electrostatic precipitator as defined in claim 1 wherein a plurality of said plate electrode members are positioned within the flow path in spaced-apart generally parallel relation, and said plurality of electrode members are connected together at one edge thereof to form a first unitary plate assembly in parallel array.
  • An electrostatic precipitator as defined in claim 3 wherein said potential difference establishing means includes means for electrically grounding said collector electrodes and means for applying a negative potential to said plate electrode members.
  • An electrostatic precipitator as defined in claim 1 further comprising sump means for receiving and storing particles precipitated from the fluid stream.
  • each plate electrode member and collector electrode is vertically disposed within the housing;
  • the housing further includes a member forming a lower boundary for the flow path, said member having formed therein a plurality of apertures, and sump means positioned below said member for receiving therethrough particles precipitated from the fluid stream.
  • a plurality of plate electrode members are positioned within the flow path
  • said plurality of electrode members are connected together at their upper edges so as to form a first unitary plate assembly in parallel array
  • the collector electrodes associated with said plurality of plate electrode members are connected together at their lower edges by the lower bounda-- ry forming member so as to form a second unitary plate assembly in parallel array, the plates of the first and second assemblies being interleaved.
  • An air cleaning system for treating environmental air in a building enclosure, including means for flowing the environmental air through the system, a mechanical air filter at an upstream location within the system and an electrostatic precipitator for electrostatically removing particulates from the air at a downstream location within the system, wherein the improvement comprises;
  • At least one plate electrode member positioned within the precipitator to extend from a upstream end adjacent the precipitator inlet in a direction generally parallel to the direction of flow to a downstream end adjacent the precipitator outlet, said upstream and downstream ends of each plate electrode member thereby extending transversely of the direction of flow;
  • each plate electrode member a plurality of pointed members spaced along the upstream end of each plate electrode member and extending upstream therefrom at an acute angle to the longitudinal centerline of the electrode member, said pointed members being symmetrically disposed on opposite sides of said longitudinal centerline;
  • a plate collector electrode positioned on either side of each electrode member in generally parallel relation thereto and having an upstream end located upstream of the pointed members of the adjacent electrode member and a downstream end adjacent the downstream end of said electrode member;
  • each electrode member means for establishing a potential difference between each electrode member and the adjacent collector electrodes productive of (1) a corona discharge between each pointed member and the opposed region of each collector electrode that is directed in substantial part against the direction of flow and (2) a nondischarging precipitation field between the region of each electrode member downstream of the pointed members and the opposed region of each collector electrode.

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Cited By (20)

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US4056372A (en) * 1971-12-29 1977-11-01 Nafco Giken, Ltd. Electrostatic precipitator
US4119416A (en) * 1977-06-22 1978-10-10 Nissan Motor Company, Ltd. Electrostatic precipitator
US4133653A (en) * 1977-08-01 1979-01-09 Filterlab Corporation A Subsidiary Of Masco Corporation Air filtration assembly
DE2836787A1 (de) * 1978-08-23 1980-03-06 Sun Electric Europ Bv Abgasanalysator fuer dieselmotoren
US4342571A (en) * 1974-05-08 1982-08-03 United Mcgill Corporation Electrostatic precipitator
US5302190A (en) * 1992-06-08 1994-04-12 Trion, Inc. Electrostatic air cleaner with negative polarity power and method of using same
EP1629895A1 (en) * 2004-08-31 2006-03-01 Matsushita Electrical Industrial Co., Ltd Electric dust collector, and air conditioner and air purifier incorporating therein the dust collector
WO2007053028A1 (en) * 2005-11-01 2007-05-10 Roger Gale Single stage electrostatic precipitator
JP2008539067A (ja) * 2005-04-29 2008-11-13 クロノス・アドバンスト・テクノロジーズ・インコーポレイテッド 静電空気清浄装置
US20130192341A1 (en) * 2010-03-05 2013-08-01 Xtralis Techhnologies Ltd 2nd Floor Particle precipitator
US20130232807A1 (en) * 2011-05-12 2013-09-12 Michael E. Robert Hand Dryer With Sanitizing Ionization Assembly
US8852325B2 (en) 2008-11-26 2014-10-07 Eads Deutschland Gmbh Device for collecting particles that have a strong electron affinity
US20150360233A1 (en) * 2013-02-15 2015-12-17 Tecnologica S.A.S. Di Vanellal Salvatore & C. Particulate filtration apparatus for combustion gases, exhaust gases and the like, and associated output circuit
WO2016044443A1 (en) * 2014-09-16 2016-03-24 Philip Demokritou Engineered water nanostructures (ewns) and uses thereof
US10369576B2 (en) * 2015-11-03 2019-08-06 Hyundai Motor Company Electrical dust-collecting filter
CN110404681A (zh) * 2019-08-05 2019-11-05 北京中科纳清科技股份有限公司 复合颗粒带电和吸附功能的过滤器及空气净化设备
US10548439B2 (en) 2011-04-07 2020-02-04 Excel Dryer, Inc. Sanitizing hand dryer
US11377378B2 (en) * 2005-06-10 2022-07-05 Ugsi Solutions, Inc. Electrolytic cell and system for treating water
CN114728293A (zh) * 2019-11-27 2022-07-08 琼尼·根赛尔 颗粒消除器
CN114832944A (zh) * 2022-04-29 2022-08-02 中国计量大学 一种使用导流板的高风速两级式静电去除气溶胶颗粒装置

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JPS4989962A (enrdf_load_stackoverflow) * 1972-12-30 1974-08-28
DE3173286D1 (en) * 1980-05-06 1986-02-06 Fleck Carl M Electrostatic air filter

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US2255677A (en) * 1940-02-15 1941-09-09 Westinghouse Electric & Mfg Co Electrical precipitator, especially for minute dust particles
US2275001A (en) * 1940-07-16 1942-03-03 Western Precipitation Corp Apparatus for electrical precipitation
GB611137A (en) * 1946-04-23 1948-10-26 Whessoe Ltd Improvements in apparatus for the electrical precipitation of suspended particles from gases
GB627068A (en) * 1947-01-09 1949-07-27 Whessoe Ltd Improvements in electrostatic precipitating apparatus
US2490979A (en) * 1947-06-28 1949-12-13 Westinghouse Electric Corp Electrostatic precipitator
US2969127A (en) * 1957-09-30 1961-01-24 Richard R Cook Air purifier
US3191362A (en) * 1962-02-05 1965-06-29 Knapp Monarch Co Electrostatic air purifier
US3172747A (en) * 1962-12-10 1965-03-09 nodolf
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US3540191A (en) * 1967-01-31 1970-11-17 Marc Victor Edgard Herman Electrostatic separator
US3412530A (en) * 1967-02-06 1968-11-26 George H. Cardiff Electrostatic air filter structure
US3511030A (en) * 1967-02-06 1970-05-12 Cottrell Res Inc Methods and apparatus for electrostatically cleaning highly compressed gases

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056372A (en) * 1971-12-29 1977-11-01 Nafco Giken, Ltd. Electrostatic precipitator
US4342571A (en) * 1974-05-08 1982-08-03 United Mcgill Corporation Electrostatic precipitator
US4119416A (en) * 1977-06-22 1978-10-10 Nissan Motor Company, Ltd. Electrostatic precipitator
US4133653A (en) * 1977-08-01 1979-01-09 Filterlab Corporation A Subsidiary Of Masco Corporation Air filtration assembly
DE2836787A1 (de) * 1978-08-23 1980-03-06 Sun Electric Europ Bv Abgasanalysator fuer dieselmotoren
US4257258A (en) * 1978-08-23 1981-03-24 Sun Electric Europe B.V. Exhaust gas analyzer for diesel engines
US5302190A (en) * 1992-06-08 1994-04-12 Trion, Inc. Electrostatic air cleaner with negative polarity power and method of using same
EP1629895A1 (en) * 2004-08-31 2006-03-01 Matsushita Electrical Industrial Co., Ltd Electric dust collector, and air conditioner and air purifier incorporating therein the dust collector
EP1885502A4 (en) * 2005-04-29 2010-12-15 Kronos Advanced Tech Inc ELECTROSTATIC AIR CLEANING DEVICE
JP2008539067A (ja) * 2005-04-29 2008-11-13 クロノス・アドバンスト・テクノロジーズ・インコーポレイテッド 静電空気清浄装置
US11377378B2 (en) * 2005-06-10 2022-07-05 Ugsi Solutions, Inc. Electrolytic cell and system for treating water
US11851353B2 (en) 2005-06-10 2023-12-26 Ugsi Solutions, Inc. Electrolytic cell and system for treating water
US20080307973A1 (en) * 2005-11-01 2008-12-18 Roger Gale Single Stage Electrostatic Precipitator
CN101316659B (zh) * 2005-11-01 2011-05-04 罗格·格礼 单区静电除尘器
US7942952B2 (en) 2005-11-01 2011-05-17 Roger Gale Single stage electrostatic precipitator
AU2006309419B2 (en) * 2005-11-01 2010-12-02 Roger Gale Single stage electrostatic precipitator
WO2007053028A1 (en) * 2005-11-01 2007-05-10 Roger Gale Single stage electrostatic precipitator
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DE2116566A1 (de) 1971-12-02
FR2090046A1 (enrdf_load_stackoverflow) 1972-01-14

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