US3668835A - Electrostatic dust separator - Google Patents

Electrostatic dust separator Download PDF

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Publication number
US3668835A
US3668835A US8295A US3668835DA US3668835A US 3668835 A US3668835 A US 3668835A US 8295 A US8295 A US 8295A US 3668835D A US3668835D A US 3668835DA US 3668835 A US3668835 A US 3668835A
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United States
Prior art keywords
venturi unit
gas
outlet
venturi
particles
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Expired - Lifetime
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US8295A
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English (en)
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Pierre Vicard
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Individual
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Priority claimed from FR6903675A external-priority patent/FR2031999A5/fr
Priority claimed from FR6907777A external-priority patent/FR2038546A6/fr
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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
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/36—Controlling flow of gases or vapour
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/54—Venturi scrubbers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/38—Tubular collector electrode

Definitions

  • the coarse parti- 51 1m. 01. ..B03c 3/36, B03c 3 41 cles of the p y are electrified y influence and y attract [58] Field of Search... ..55 5, 10, 11, 7, 107, 117, and retain the finer ionized dust Particles carried y the 5 g 119, 20 2 124, 2 23 30 4
  • the spraying nozzle may be disposed within an auxiliary Ven- 135 136, 137, 133, 139, 146 150, 151 152 154, turi to increase the velocity of the gas and to improve impact DIG 38 129, 226 238 257' 259 319 338 345, effects between the dust particles and the sprayed particles.
  • the ionizing electrode is preferably formed with fins to 317/3 enhance the ionizing corona discharge, while the polarizing electrode is on the contrary smooth to avoid any noticeable [56] References Cited discharge effect.
  • the gas to be treated may be fed into the inlet of the main Venturi by an injector nozzle to produce a UNITED STATES PATENTS negative pressure whereby a portion of the gas issuing from the main Venturi may be recycled into same through an annul,333,790 3/1920 Bradley "SS/I 52 X passage provided around the i main Ventmi 1,579,462 4/1926 Wintermute ..55/ X 2,357,355 9/1944 Penney ..55/l07 7 Claims, 7 Drawing Figures PATENTEnJuu 1 3 1912 3, 668 835 sum 1 or 2 I) INYENT R.
  • the present invention relates to electrostatic dust separators of the kind comprising an axial high voltage electrode disposed in a Venturi unit so as to ionize the dust particles in suspension in the gas which flows through the said unit, the said particles being thereafter electrostatically separated from the gas itself.
  • an electrostatic dust separator of the kind above referred to comprises means disposed downstream of the Venturi unit for producing in the gas stream which issues from the said unit a spray of particles of an auxiliary substance, these particles being appropriately electrified so as to attract and to retain the ionized dust particles in suspension in the gas stream.
  • the auxiliary substance which may be a divided solid or preferably a liquid such as water, may be sprayed around a polarizing electrode disposed in the gas stream.
  • the axial ionizing electrode is conveniently formed of a rod provided with thin radially extending longitudinal fins between which the gas stream may circulate so as to dislodge any dust particle which could have settled on the said electrode, while the polarizing electrode is preferably made of a mere smooth rod.
  • a portion of the gas issuing from the outlet of the Venturi unit is preferably recycled into the inlet thereof in order that the ionized dust particles entrained by the recycled gas may form nuclei adapted to attract and to retain the dust particles in suspension in the untreated gas.
  • FIG. 1 is a general vertical section of an electrostatic dust separator according to the invention.
  • FIG. 2 reproduces to an enlarged scale the upper portion of FIG. 1, but showing the butterfly valve at its transverse position.
  • FIGS. 3 and 4 are cross-sections taken along lines III-III and IV-IV ofFIG. 1.
  • FIG. 5 is a view similar to FIG. 1, but illustrating a modified embodiment.
  • FIG. 6 is a transverse section taken along line VI-VI of FIG. 5.
  • FIG. 7 is a vertical section showing the lower portion of another embodiment of the invention.
  • the electrostatic dust separator illustrated in FIGS. 1 to 4 comprises a vertical cylindrical casing 1 having at its upper end a converging injector nozzle 2.
  • This injector nozzle opens in front of the converging inlet 3 of a conduit comprising a neck portion 4 followed by a diverging portion 5, the said conduit thus forming a Venturi unit which is axially maintained within the outer casing 1 by radial arms such as 6.
  • An insulating cross-member 7 is provided in the vicinity of the lower end or outlet of Venturi unit 3-4-5.
  • This crossmember carries two vertical axial electrodes 8 and 9. The first one extends upwardly through the Venturi unit and it terminates in the vicinity of the neck of the said unit, while the other one 9 extends downwardly well below the lower end thereof.
  • the first electrode 8, or ionizing electrode is formed of a rod provided with a relatively large number of longitudinal radial fins 10 of quite reduced thickness which therefore have a relatively sharp outer edge. These fins may for instance be mounted in longitudinal slots milled in the periphery of the rod and in which they are retained by soldering or otherwise.
  • the second electrode 9, or polarizing electrode it is formed of a smooth rod of relatively large diameter, as illustrated in FIG. 4.
  • annular nozzle 11 carried by a tube 12 which extends through the conical bottom 13 of the casing, its outer end 14 being adapted to be connected with an appropriate supply.
  • the nozzle 11 is so arranged as to produce a slightly diverging annular spray, concentric to the lower electrode 9 without any intermediate screen and at a relatively small distance thereof. This spray strikes the casing wall, as indicated at 15.
  • the spraying nozzle 11 is supplied with an appropriate liquid under pressure, as for instance water, it being however noted that it would also be possible to spray solid particles in suspension in a gas such as air.
  • the nozzle, the liquid or the pulverized solid arc electrically conducting and the nozzle is grounded.
  • the bottom 13 of casing 1 has a lower outlet 16 closed by an appropriate air-lock device, while a lateral exhaust 17 is provided somewhat above the said bottom.
  • the upper nozzle 2 is equipped with a valve 18 of the butterfly type, pivoted about a transverse horizontal axis, this valve, of circular contour, being of such diameter that at the horizontal position (see FIG. 2), it does not fully close the nozzle but leaves an annular gas passage 19 between its periphery and the inner side of this nozzle.
  • Both electrodes 8 and 9 are connected by means (not illustrated) with an appropriate high voltage source, also not shown.
  • the dust-laden gas enters the apparatus through nozzle 2, valve 18 being fully open as illustrated in FIG. 1.
  • This gas flows downwardly in the form of a jet through the converging portion 3, the neck 4 and the diverging portion 5.
  • the gaseous mass thus realized flows downwardly at a high velocity along the ionizing electrode 8, the water vapor contained by the gas condensing on the dust particles in the neck portion 4, in a per se known manner.
  • the high voltage applied to electrode 8 results in a sparkless electric discharge of the type generally called corona effect, between this electrode and the surrounding walls of the Venturi, whereby the suspended particles are strongly ionized.
  • a substantial portion of the gas issuing from the lower end of the Venturi unit 3-4-5 is recycled upwardly between the said unit and easing 1, together with the suspended particles, due to the injector effect of the jet from nozzle 2.
  • the gaseous mass which flows through the Venturi unit is thus, so to speak, inseminated with already ionized particles which play the role of nuclei on which the other particles tend to agglomerate. This progressive growdi of the suspended particles facilitates their separation.
  • the ionization effects within the Venturi unit 3-4-5 are extremely rapid.
  • the velocity of the gas flow through the latter may therefore be quite high.
  • the production of filtered gas is thus important and moreover the dust particles cannot settle on the inner walls of the Venturi, which eliminates the frequent cleaning operations generally required in conventional electrostatic separators.
  • the gas stream may freely circulate between the successive radial fins where dust particles cannot therefore be retained.
  • the recycled gas stream is submitted to a sudden change of direction at the outlet of the Venturi unit 3-4-5, as shown by the arrows in FIG. 1.
  • This entails a quite noticeable centrifugal acceleration which tends to separate the biggest particles from this stream.
  • the zone immediately below the Venturi unit acts as a centrifugal separator for the particles in the recycled gas stream, those which have grown by collecting and retaining smaller particles within the Venturi, being selectively projected downwardly towards the spraying nozzle 1 1.
  • the butterfly valve 18 is of no use when the flow (quantity per unit of time) of dust-laden gas to be filtered is substantially constant.
  • the inlet portion or the neck of the Venturi unit could be provided with helicoidal vanes imparting to the gas stream a rotational motion of high angular velocity in order to separate the biggest particles.
  • the fins should also be helicoidal so as not to hinder circulation of the gas between them also care would have to be taken that the vanes do not short-circuit the axial electrode (the latter could be of reduced length or the vanes could be made of an insulating material).
  • the apparatus could comprise a lower settling chamber of large volume for a better separation of the coarse particles from the gas before the latter reaches the outlet 17.
  • the spray of electrified particles below the Venturi unit could be realized in any appropriate manner.
  • the inner side of the walls of the Venturi unit 34-5 could be provided with fins or blades in order to enhance ionization of the incoming dust particles. In some cases the recycling could be dispensed with.
  • the Venturi unit 3-4-5 is surrounded by an intermediate cylindrical casing 20 of substantially larger diameter (about twice the diameter of the neck portion 4 of the Venturi), this intermediate casing being spaced from the main outer casing 1 so as to leave an annular passage for the recycled gas stream.
  • the upper and lower edges of this intermediate casing 20 are joined with the upper and, respectively, the lower end of the Venturi so as to form therewith a single member enclosing an inner closed annular space, this member being supported by the radial arms 6.
  • Radial partitions such as 21 are disposed within the said closed space between the Venturi unit 3-4-5 and the intermediate casing 20.
  • These partitions, as well as the intermediate casin g, the Venturi unit itself and the supporting arms 6 are made of a conducting material such as a metal.
  • the closed space may further be filled with a conducting substance such as water.
  • Venturi unit 345 is only connected electrically with the intermediate casing 20 which is itself grounded through arms 6.
  • the Venturi unit 3-4-5 becomes electrified by influence, which means that electric charges of a polarity opposed to that of electrode 8 appear on its inner surface, while charges of the other polarity flow freely from the Venturi unit towards the intermediate casing 20 through the radial partitions 21 (and also through the conducting substance which fills the hollow space between the Venturi and the intermediate casing when such a filling is provided).
  • the electrostatic field which appears between the venturi and the upper electrode 8 is much stronger. Furthermore the ionization current which circulates between the electrode.
  • Venturi may freely flow towards the intermediate casing 20 without determining on the inner surface of the Venturi localized electric charges which could limit the ionization effects.
  • the spraying nozzle 11 should be grounded through a connection of substantial length.
  • the said connection is comprised of the oblique tube 12 which may be provided relatively long without-requiring any particular arrangement for this purpose.
  • an additional Venturi unit 22-23 is disposed below the outlet of the diverging portion 5 of the main Venturi unit with which it is connected by a perforated intermediate zone 24.
  • This zone may be formed of a perforated plate or of a grid, as shown.
  • the spraying nozzle 11 is axially disposed within the additional Venturi unit 22-23 and it is carefully stream-lined, as illustrated. Its annular spray is so directed as to flare upwardly and to pass through the perforated zone or grid 24.
  • the lower end or outlet of the additional Venturi unit is flanged outwardly as shown as 25, so as to close the annular space between the said Venturi unit and the outer casing, apart from some holes 26 of reduced crosssection.
  • the gas stream issuing from the diverging portion 5 of the main Venturi unit is considerably accelerated in the converging inlet 22 of the additional Venturi unit.
  • the impact effects between the dust particles or agglomerates of dust particles and the coarse liquid particles from the spraying nozzle 11 are greatly enhanced.
  • the coarse particles collect between the additional Venturi and the outer casing together with the dust particles which they have entrained, and the liquid flows through the holes 26 towards the bottom of casing 1, wherefrom it is evacuated through the air-lock device 16.
  • the angle of the spray with respect to the axis of the apparatus in the zone 24 is preferably below 45.
  • the recycled gas stream passes through the grid 24 as indicated by the arrows 27.
  • An electrostatic dust separator comprising:
  • Venturi unit having an inlet and an outlet for a dust-laden a high-voltage ionizing electrode disposed axially of said Venturi and terminating substantially at the outlet thereof, said ionizing electrode being in the form of a rod having thin longitudinally extending radial fins to ionize dust particles in the gas within said unit, and said ionizing electrode having a predetermined polarity;
  • a high-voltage polarizing electrode forming an extension of said ionizing electrode beyond the outlet of said Venturi unit, said electrode being in the form of a smooth rod, said polarizing electrode having the same polarity as said ionizing electrode;
  • an axial injector nozzle in said outer casing in front of the inlet of said Venturi unit to receive the gas to be treated and to inject same into said inlet together with a portion of the gas issuing from the outlet of said Venturi unit upstream of the spraying means, said portion thus being recycled through said passage.
  • a butterfly valve disposed within said injector nozzle, the diameter of said valve being such that at its position transverse to said injector nozzle it leaves an annular gas passage through said injector nozzle.
  • an intermediate casing axially enclosing said Venturi unit while being spaced therefrom, said intermediate casing having a first and a second end respectively joined to the inlet and to the outlet of said Venturi unit so as to determine therewith a closed annular space, and said Venturi unit and said intermediate casing being made of an electrical conducting material;
  • An electrostatic dust separator comprising:
  • Venturi unit having an inlet at one end for the dust-laden gas to be treated, and an outlet at the other end through which said gas issues;
  • a high-voltage ionizing electrode axially disposed in said Venturi unit to ionize dust particles in the gas flowing therethrough;
  • electrifying means adjacent the outlet to electrify said sprayed particles with such a polarity that they attract and retain ionized dust particles in the gas issuing from said Venturi unit;
  • auxiliary Venturi unit disposed downstream of the first named unit to receive the gas issuing from the outlet of said first-named Venturi unit, said auxiliary Venturi unit having an inlet portion disposed adjacent the outlet of the first named Venturi unit, and having a neck portion and an outlet portion with said spraying means and said electrifying means being so disposed within said auxiliary Venturi unit that the spray of particles of said auxiliary substance is produced in the vicinity of the neck portion of said auxiliary Venturi unit in order that said particles of said auxiliary substance may act on the dust particles in a zone wherein the gas which contains said dust particles flows with a high velocity.
  • An electrostatic dust separator comprising:
  • an elongated outer casing having a first end and a second end;
  • an injector nozzle disposed in axial alignment with the axis of said outer casing and at the first end of said outer casing to receive the dust-laden gas to be treated;
  • a main Venturi unit axially disposed within said outer casing while leaving an annular gas-recycling passage between said main Venturi unit and said outer casing, said main Venturi unit having an inlet portion, a neck portion and an outlet portion, with said inlet portion disposed in spaced relationship to said injector nozzle, said inlet portion being disposed between said injector nozzle and said second end, said inlet portion being disposed downstream of said injector nozzle to receive the gas issuing therefrom, and at a distance therefrom so as to form therewith a gas-recycling injector device;
  • a high-voltage electrode axially disposed within said main Venturi unit to ionize dust particles in the gas flowing therethrough;
  • auxiliary Venturi unit axially disposed within said outer casing downstream of said main Venturi unit to receive the gas issuing therefrom and leaving an annular space between said outer casing and said auxiliary Venturi unit
  • said auxiliary Venturi unit havingan inlet portion, a neck portion and an outlet portion, with said inlet portion of said auxiliary Venturi unit being spaced from the outlet portion of said main Venturi unit so as to leave an intermediate annular zone;
  • a high-voltage polarizing electrode extending axially of and adjacent to the inlet portion of said auziliary Venturi unit
  • annular spraying nozzle axially disposed in the outlet portion of said auxiliary Venturi unit to produce an annular diverging spray of electrically conducting liquid particles which surrounds said polarizing electrode and passes through said intermediate annular zone so as to collect within said annular space together with the ionized dust particles which they have retained;

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US8295A 1969-02-13 1970-02-03 Electrostatic dust separator Expired - Lifetime US3668835A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR6903675A FR2031999A5 (en) 1969-02-13 1969-02-13 Electrostatic dust collection
FR6907777A FR2038546A6 (en) 1969-03-24 1969-03-24 Electrostatic dust collection

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BE (1) BE745288A (xx)
CA (1) CA939617A (xx)
CH (1) CH521170A (xx)
DE (1) DE2006298C3 (xx)
ES (1) ES376456A1 (xx)
GB (1) GB1239712A (xx)
SE (1) SE362019B (xx)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920774A (en) * 1972-11-06 1975-11-18 Standard Havens Evaporative cooler
US4029485A (en) * 1975-08-08 1977-06-14 Ab S.T. Miljoteknik Gas cleaners
US4093430A (en) * 1974-08-19 1978-06-06 Air Pollution Systems, Incorporated Apparatus for ionizing gases, electrostatically charging particles, and electrostatically charging particles or ionizing gases for removing contaminants from gas streams
US4247307A (en) * 1979-09-21 1981-01-27 Union Carbide Corporation High intensity ionization-wet collection method and apparatus
US4316727A (en) * 1979-10-18 1982-02-23 Gottfried Bischoff Bau Kompl. Gasreinigungs- und Wasserruckkuhlanlagen GmbH & Co. KG Annular-gap washer including electrode means
US4357151A (en) * 1981-02-25 1982-11-02 American Precision Industries Inc. Electrostatically augmented cartridge type dust collector and method
WO1983003777A1 (en) * 1982-04-26 1983-11-10 Western Electric Company, Inc. Vapor-phase axial deposition system
US4449159A (en) * 1977-04-07 1984-05-15 Electric Power Research Institute, Inc. Focusing electrodes for high-intensity ionizer stage of electrostatic precipitator
US4652407A (en) * 1984-09-22 1987-03-24 Rheinische Braunkohlenwerke Ag. Gas cooling and washing apparatus
US5147423A (en) * 1991-03-01 1992-09-15 Richards Clyde N Corona electrode for electrically charging aerosol particles
US5922111A (en) * 1994-08-30 1999-07-13 Omi Kogyo Co., Ltd. Electrostatic precipitator
US6238459B1 (en) * 1999-04-23 2001-05-29 The Babcock & Wilcox Company Ultra-high particulate collection of sub-micron aerosols
WO2003002861A1 (en) * 2001-06-05 2003-01-09 Fortum Oyj Method for preparing clean intake air for gas turbine
US6527829B1 (en) 2000-03-15 2003-03-04 Fortum Oyj Method and arrangement for purifying the intake air of a gas turbine
US20040226449A1 (en) * 2003-05-15 2004-11-18 Heckel Scott P. Electrostatic precipitator with internal power supply
US20050028676A1 (en) * 2003-08-05 2005-02-10 Heckel Scott P. Corona discharge electrode assembly for electrostatic precipitator
US20050224023A1 (en) * 2004-04-08 2005-10-13 Heckel Scott P Electrostatic precipitator with pulsed high voltage power supply
US20050224022A1 (en) * 2004-04-08 2005-10-13 Heckel Scott P Electrostatic droplet collector with replaceable electrode
US20050223893A1 (en) * 2004-04-08 2005-10-13 Hoverson Gregory W Multistage space-efficient electrostatic collector
US20050237693A1 (en) * 2004-04-08 2005-10-27 Heckel Scott P Method of operation of, and protector for, high voltage power supply for electrostatic precipitator
US20070079704A1 (en) * 2005-10-11 2007-04-12 Mcanespie Donald I Electrostatic precipitator
EP2036615A3 (de) * 2007-09-13 2010-02-17 Peter Buchta Elektrofilter für eine Feuerungsanlage
US20150090119A1 (en) * 2013-10-01 2015-04-02 Honeywell International Inc. Self-contained aircraft electronic air treatment system
US20150090114A1 (en) * 2013-10-01 2015-04-02 Honeywell International Inc. Aircraft electrostatic particle separation control system
US20150090120A1 (en) * 2013-10-01 2015-04-02 Honeywell International Inc. Aircraft electronic particle separation system
US9206740B2 (en) 2013-01-04 2015-12-08 Honeywell International Inc. Liquid injection inlet particle separator systems and methods
US20150354461A1 (en) * 2014-04-03 2015-12-10 Honeywell International Inc. Engine systems and methods for removing particles from turbine air
CN107442282A (zh) * 2017-09-19 2017-12-08 东北师范大学 旋转式负压静电涡流微尘收集电极

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AU3424099A (en) * 1999-04-19 2000-11-02 Fortum Service Oy Arrangement and method for purification of flowing gas
CN108224617A (zh) * 2018-03-10 2018-06-29 苏州暖舍节能科技有限公司 一种带有离子净化装置的散热系统

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US1333790A (en) * 1915-06-28 1920-03-16 Research Corp Means for electrical treatment of gases
US1579462A (en) * 1925-02-11 1926-04-06 Research Corp Method of and apparatus for separating light materials from gases
GB421811A (en) * 1933-05-20 1934-12-20 Brassert & Co Improved method and apparatus for purifying air or gases
AT159412B (de) * 1938-05-14 1940-08-26 Fraembs & Freudenberg Dampfumformer.
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GB940930A (en) * 1961-05-30 1963-11-06 Lodge Cottrell Ltd Improvements in and relating to gas scrubbers
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US1333790A (en) * 1915-06-28 1920-03-16 Research Corp Means for electrical treatment of gases
US1579462A (en) * 1925-02-11 1926-04-06 Research Corp Method of and apparatus for separating light materials from gases
GB421811A (en) * 1933-05-20 1934-12-20 Brassert & Co Improved method and apparatus for purifying air or gases
AT159412B (de) * 1938-05-14 1940-08-26 Fraembs & Freudenberg Dampfumformer.
US2357355A (en) * 1941-05-13 1944-09-05 Westinghouse Electric & Mfg Co Electrical dust precipitator utilizing liquid sprays
US2852239A (en) * 1952-02-05 1958-09-16 Vicard Pierre Georges Apparatus for treating gases
GB940930A (en) * 1961-05-30 1963-11-06 Lodge Cottrell Ltd Improvements in and relating to gas scrubbers
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US3526081A (en) * 1965-07-09 1970-09-01 Wilhelm Kusters Gas purification

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920774A (en) * 1972-11-06 1975-11-18 Standard Havens Evaporative cooler
US4093430A (en) * 1974-08-19 1978-06-06 Air Pollution Systems, Incorporated Apparatus for ionizing gases, electrostatically charging particles, and electrostatically charging particles or ionizing gases for removing contaminants from gas streams
US4110086A (en) * 1974-08-19 1978-08-29 Air Pollution Systems, Inc. Method for ionizing gases, electrostatically charging particles, and electrostatically charging particles or ionizing gases for removing contaminants from gas streams
US4029485A (en) * 1975-08-08 1977-06-14 Ab S.T. Miljoteknik Gas cleaners
US4449159A (en) * 1977-04-07 1984-05-15 Electric Power Research Institute, Inc. Focusing electrodes for high-intensity ionizer stage of electrostatic precipitator
US4247307A (en) * 1979-09-21 1981-01-27 Union Carbide Corporation High intensity ionization-wet collection method and apparatus
US4316727A (en) * 1979-10-18 1982-02-23 Gottfried Bischoff Bau Kompl. Gasreinigungs- und Wasserruckkuhlanlagen GmbH & Co. KG Annular-gap washer including electrode means
US4357151A (en) * 1981-02-25 1982-11-02 American Precision Industries Inc. Electrostatically augmented cartridge type dust collector and method
WO1983003777A1 (en) * 1982-04-26 1983-11-10 Western Electric Company, Inc. Vapor-phase axial deposition system
US4652407A (en) * 1984-09-22 1987-03-24 Rheinische Braunkohlenwerke Ag. Gas cooling and washing apparatus
US5147423A (en) * 1991-03-01 1992-09-15 Richards Clyde N Corona electrode for electrically charging aerosol particles
US5922111A (en) * 1994-08-30 1999-07-13 Omi Kogyo Co., Ltd. Electrostatic precipitator
US6238459B1 (en) * 1999-04-23 2001-05-29 The Babcock & Wilcox Company Ultra-high particulate collection of sub-micron aerosols
US6527829B1 (en) 2000-03-15 2003-03-04 Fortum Oyj Method and arrangement for purifying the intake air of a gas turbine
WO2003002861A1 (en) * 2001-06-05 2003-01-09 Fortum Oyj Method for preparing clean intake air for gas turbine
US20040226449A1 (en) * 2003-05-15 2004-11-18 Heckel Scott P. Electrostatic precipitator with internal power supply
US6902604B2 (en) 2003-05-15 2005-06-07 Fleetguard, Inc. Electrostatic precipitator with internal power supply
US20050028676A1 (en) * 2003-08-05 2005-02-10 Heckel Scott P. Corona discharge electrode assembly for electrostatic precipitator
US20050223893A1 (en) * 2004-04-08 2005-10-13 Hoverson Gregory W Multistage space-efficient electrostatic collector
US20050224022A1 (en) * 2004-04-08 2005-10-13 Heckel Scott P Electrostatic droplet collector with replaceable electrode
US20050224023A1 (en) * 2004-04-08 2005-10-13 Heckel Scott P Electrostatic precipitator with pulsed high voltage power supply
US20050237693A1 (en) * 2004-04-08 2005-10-27 Heckel Scott P Method of operation of, and protector for, high voltage power supply for electrostatic precipitator
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US7082897B2 (en) 2004-04-08 2006-08-01 Fleetguard, Inc. Electrostatic precipitator with pulsed high voltage power supply
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Also Published As

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SE362019B (xx) 1973-11-26
BE745288A (fr) 1970-07-01
JPS4821997B1 (xx) 1973-07-03
DE2006298B2 (de) 1980-04-03
CA939617A (en) 1974-01-08
DE2006298C3 (de) 1980-11-20
DE2006298A1 (xx) 1970-09-03
ES376456A1 (es) 1972-04-16
GB1239712A (xx) 1971-07-21
CH521170A (fr) 1972-04-15

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