US3357159A - Dust concentrator - Google Patents

Dust concentrator Download PDF

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Publication number
US3357159A
US3357159A US577262A US57726266A US3357159A US 3357159 A US3357159 A US 3357159A US 577262 A US577262 A US 577262A US 57726266 A US57726266 A US 57726266A US 3357159 A US3357159 A US 3357159A
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US
United States
Prior art keywords
particles
cylinder
gas
stream
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.)
Expired - Lifetime
Application number
US577262A
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English (en)
Inventor
John W Drenning
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.)
Beazer East Inc
Original Assignee
Koppers Co 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 Koppers Co Inc filed Critical Koppers Co Inc
Priority to US577262A priority Critical patent/US3357159A/en
Priority to DE19671557110 priority patent/DE1557110A1/de
Priority to CH946167A priority patent/CH466231A/de
Priority to GB36839/67A priority patent/GB1151026A/en
Priority to FR1551026D priority patent/FR1551026A/fr
Application granted granted Critical
Publication of US3357159A publication Critical patent/US3357159A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/49—Collecting-electrodes tubular
    • 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
    • B03C3/74—Cleaning the electrodes
    • 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

  • Electrostatic precipitator apparatus for removing particles from a gas stream by way of a discharge electrode which charges the particles passing by it so that the particles migrate toward a collector electrode is improved by forming the collector electrode as two concentric tubes which surround the discharge electrode and providing means for selectively using one of the tubes as a collecting electrode while previously deposited particles are being removed from the other tube.
  • This invention relates to the separation of solid particles from gaseous streams.
  • the major portion Due to the particles movement toward the collector electrode, the major portion is freed of the particles, and the stream that is the minor portion of the gas volume flows past the collector electrode at such rate as to carry the particles beyond the collector electrode.
  • the burden of particles in this minor portion is increased and this portion is flowed on to a secondary gas removing apparatus for the cleaning of this stream. Accordingly the particles are not deposited on the collector electrode as they are in a conventional electrostatic precipitator.
  • This invention is an improvement upon the apparatus of Patent No. 2,906,369 in the provision for cleaning the collector electrode surface.
  • the invention is also advantageously employed with gas cleaning apparatus where the velocity of the gas is not so great as to have unusual scouring action. In this latter application, the collected particles are mechanically removed.
  • the collector electrode is comprised of two surfaces.
  • this first surface with any accumulated particles thereon is removed from association with the discharge electrode and replaced with a second surface, meanwhile the first surface is cleaned.
  • the surfaces are cleaned by being subjected to the scouring action of the high velocity gas.
  • the surfaces are mechanically cleaned. Subsequently the first and second surfaces are reversed and the cycle repeated.
  • FIGURE 1 illustrates partially in schematic fashion a section of a unit of an electrostatic precipitator incorporating an embodiment of the invention
  • FIGURE 2 illustrates the apparatus of FIG. 1 in the condition where the particles which have accumulated on a first surface are removed while particles accumulate on a second surface;
  • FIGURE 3 illustrates the apparatus of FIG. 1 where the particles which have accumulated on the second surface are being removed while the particles are accumulating on the first surface;
  • FIGURE 4 illustrates partially in schematic fashion another embodiment of an electrostatic precipitator having an embodiment of the invention incorporated therein;
  • FIGURE 5 illustrates a second condition of the embodi ment of the precipitator of FIG. 4.
  • the total gas stream A as is described in the aforementioned Patent No. 2,906,369 flows through inlet 9 into a generally cylindrical ionizing chamber 10.
  • a discharge electrode 11, which is a wire, imparts an electrostatic charge to the particles carried in the gas stream. These particles then migrate toward the cylindrical collector electrode surface 13.
  • the outer annular portion of the gas stream thus becomes richer in particles while the inner annular or core portion of the gas stream is freed of particles.
  • the gas volume, itself, is divided into two streams by conduits 15 and 17.
  • the clean gas stream B which is relatively free of particles, flows in conduit 17 and the particle-laden gas stream C flows in conduit 15.
  • the gas stream flows at high velocity and tends to scour the paricles from the collector electrode denoted generally 13.
  • the gas stream C which is richer or more concentrated as far as the amount of particles when compared with the burden of gas stream A, is flowed through conduit 15 to a further or secondary particle removing system. (not shown) such, for example, as a cyclone separator.
  • the relatively clean gas in conduit 17 may, for example, be
  • the collector electrode 13 comprises two cylinders 18 and 19. These cylinders are movable so the surfaces of these cylinders are movable relative to each other and to the clean gas duct 19, this movement being accomplished by power means 21 and 23 which may, of course, be the schematically illustrated electric motors and mechanical connections 25 and 27.
  • a suitable resilient boot 29 provides a seal between duct 15 and the collector electrod arrangement.
  • motive means 21 is actuated and the cylinder 18 is again moved to its position as illustrated in FIG. 3 and motive means 23 is actuated so that the cylinder 19 is moved to a position remote from the discharge electrode 11 so that any particles which have accumulated on the surface of cylinder 19 are removed by the scouring action of the concentrated particle-laden gas stream.
  • the particle-laden gas stream itself, is usually sufficient for removing any accumulation of particles on the electrode surface when the surface is remote from the discharge electrode; this removal may be aided, if desired of course, by mechanical actions such as a rapping of the electrode.
  • the cycle of use of the first and second collector electrode may be repeated as often and as frequently as desired.
  • FIGS. 4 and 5 An embodiment of the invention for use with a mechanical arrangement for removing the particles from the collector electrode is illustrated in FIGS. 4 and 5. This arrangement isparticularly useful where the velocity of the gas flowing into the precipitator is not great enough to generate an effective scouring action. When the velocity is relatively low, particles carried by the gas deposit on the collector electrode. The particles are then removed mechanically from the electrode.
  • the precipitator is comprised generally of a discharge electrode 11, a collector electrode 13, a particleladen gas duct 15, and a clean gas duct 17
  • the excitation for the discharge electrode may be supplied by a conventional commercially available excitation arrangement.
  • the dirty gas duct 15 may be comprised of walls 41 and 42.
  • a generally cylindrical duct 43 has one end 45 fastened to wall 41 in a suitable manner such, for example, as welding and the end 47 attached to a supporting lattice-work 49. Gas flows through opening 9 into the air separating chamber of the precipitator.
  • Concentric with cylinder 43 is another cylinder 51 which is mechanically supported within cylinder 43 'by suitable mechanical means denoted as 53. It Will be noted that the collector electrode surface 13 of FIG. 4 is the inner surface of cylinder 51 and the collector electrode surface of FIG. is the inner surface of cylindrical tube 43.
  • the axial movement of cylinder 51 between the positions illustrated in FIGS. 4 and 5 is effected by conventional motor 55. Both cylinders 43 and 51 are provided with a rapping means illustrated schematically by rapping motor 61 and mechanical connections 63 and 65 to a respective cylinder 43 and 51.
  • the particle-laden gas flows past discharge electrode 11.
  • the particles in the gas become charged and move toward collector electrode surface 13. If the flow of gas is relatively slow, most of the particles will collect upon electrode surface 13. However, these particles which do not collect thereon flow onwardly through the opening between duct 17 and cylinder 51- into the dirty air duct 15. This migration of the particles toward the collector electrode 13 has left a clean core of gas which then flows through duct 17.
  • power means 55 is actuated to move the cylinder 51 away from the influence of discharge electrode 11 to the position shown in FIG. 5, at which position the surface of cylinder 51 is shielded by the clean air duct 17 Thereafter, the rapping mechanism 61 is actuated to mechanically dislodge the particles from the surface.
  • the inner surface of cylinder 43 is operative as the collector electrode 13.
  • the surface of cylinder 43 has operated as collector electrode and sufficient particles have collected on this surface to cause the surface to have lost its efiiciency
  • cylinder 51 is then moved to the position illustrated in FIG. 4.
  • the surface of cylinder 43 is shielded from the discharge electrode 11 and the rapping mechanism 6-1 is actuated to mechanically dislodge the particles from cylinder 43.
  • These particles at this time would be caught by the outer surface of cylinder 51.
  • the fiow of gas past the electrode will remove any particles lying on its outer surface.
  • An electrostatic precipitator apparatus for removing particles from a gaseous stream containing said particles through the action of a discharge electrode and a collector electrode, whereby as said gaseous stream flows past said discharge electrode, said particles are charged and are diverted radially toward the periphery of the stream whereby the particle concentration increases in the outer portion of the stream while the particle concentration decreases in the inner portion of the stream, the improvement comprising: said collector electrode being constituted of first and second cylinders of diifering diameters concentrically disposed about said discharge electrode, said second cylinder being disposable within said first cylinder, means for separating said inner and outer stream portions into independent streams, and selection means for selectively employing a surface of said, first and second cylinder as said collector electrode.
  • said selection means includes means for moving said first cylinder to a position remote from said discharge electrode so that the surface of said second cylinder becomes a collecting electrode and the particle-laden outer gas stream scours the surface of said first cylinder to clean collected particles therefrom, and
  • first cylinder being fixedly positioned, said second cylinder being mounted within said first cylinder for axial movement relative thereto, means for moving said second cylinder, and means for rapping said cylinders.

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  • Electrostatic Separation (AREA)
US577262A 1966-09-06 1966-09-06 Dust concentrator Expired - Lifetime US3357159A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US577262A US3357159A (en) 1966-09-06 1966-09-06 Dust concentrator
DE19671557110 DE1557110A1 (de) 1966-09-06 1967-06-27 Vorrichtung zum Reinigen eines Gases von darin mitgefuehrten Stoffteilchen,insbesondere Feststoffteilchen
CH946167A CH466231A (de) 1966-09-06 1967-07-04 Elektrostatische Niederschlagsvorrichtung
GB36839/67A GB1151026A (en) 1966-09-06 1967-08-10 Improvements in or relating to Apparatus for Electrostatic Precipitation of Particles from Gaseous Streams.
FR1551026D FR1551026A (de) 1966-09-06 1967-08-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US577262A US3357159A (en) 1966-09-06 1966-09-06 Dust concentrator

Publications (1)

Publication Number Publication Date
US3357159A true US3357159A (en) 1967-12-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
US577262A Expired - Lifetime US3357159A (en) 1966-09-06 1966-09-06 Dust concentrator

Country Status (5)

Country Link
US (1) US3357159A (de)
CH (1) CH466231A (de)
DE (1) DE1557110A1 (de)
FR (1) FR1551026A (de)
GB (1) GB1151026A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894852A (en) * 1973-06-16 1975-07-15 Berckheim Graf Von Electrode arrangement for establishing a steady or constant electric field
US4534776A (en) * 1982-08-16 1985-08-13 At&T Bell Laboratories Air cleaner
WO2003074184A1 (en) * 2002-03-01 2003-09-12 Per-Tec Limited Electrode mounting
US20040045442A1 (en) * 2001-02-08 2004-03-11 Karichev Ziya Ramizovich Method and device for removing inert impurities
US20110265653A1 (en) * 2008-11-26 2011-11-03 Eads Deutschland Gmbh Device for collecting particles that have a strong electron affinity

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930872A1 (de) * 1989-09-15 1991-03-28 Rolf Hertfelder Elektrostatische filtereinrichtung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1378224A (en) * 1918-02-16 1921-05-17 Charles W Girvin Art of electrical precipitation of particles from fluid streams
US1381719A (en) * 1920-12-10 1921-06-14 Frank R Mcgee Centrifugal gas-cleaning apparatus
US1444845A (en) * 1920-12-10 1923-02-13 Frank R Mcgee Apparatus for cleaning gases
AT116325B (de) * 1927-10-21 1930-02-10 Metallgesellschaft Ag Elektrischer Gasreiniger.
US2307603A (en) * 1942-02-18 1943-01-05 Westinghouse Electric & Mfg Co Electrical precipitator with automatic dust removal
US2867285A (en) * 1956-03-13 1959-01-06 Research Corp Gas cleaning apparatus
US2906369A (en) * 1956-10-31 1959-09-29 Koppers Co Inc Apparatus for removing particles from fluid streams
US3068628A (en) * 1960-09-19 1962-12-18 Buell Engineering Company Inc Magnetic cleaning means for electrodes of electrostatic precipitator

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1378224A (en) * 1918-02-16 1921-05-17 Charles W Girvin Art of electrical precipitation of particles from fluid streams
US1381719A (en) * 1920-12-10 1921-06-14 Frank R Mcgee Centrifugal gas-cleaning apparatus
US1444845A (en) * 1920-12-10 1923-02-13 Frank R Mcgee Apparatus for cleaning gases
AT116325B (de) * 1927-10-21 1930-02-10 Metallgesellschaft Ag Elektrischer Gasreiniger.
US2307603A (en) * 1942-02-18 1943-01-05 Westinghouse Electric & Mfg Co Electrical precipitator with automatic dust removal
US2867285A (en) * 1956-03-13 1959-01-06 Research Corp Gas cleaning apparatus
US2906369A (en) * 1956-10-31 1959-09-29 Koppers Co Inc Apparatus for removing particles from fluid streams
US3068628A (en) * 1960-09-19 1962-12-18 Buell Engineering Company Inc Magnetic cleaning means for electrodes of electrostatic precipitator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894852A (en) * 1973-06-16 1975-07-15 Berckheim Graf Von Electrode arrangement for establishing a steady or constant electric field
US4534776A (en) * 1982-08-16 1985-08-13 At&T Bell Laboratories Air cleaner
US20040045442A1 (en) * 2001-02-08 2004-03-11 Karichev Ziya Ramizovich Method and device for removing inert impurities
US6989050B2 (en) * 2001-02-08 2006-01-24 Alexandr Akhatovich Ganeev Device for accumulating aerosols from gases
WO2003074184A1 (en) * 2002-03-01 2003-09-12 Per-Tec Limited Electrode mounting
US20050160908A1 (en) * 2002-03-01 2005-07-28 Peter Kukla Electrode mounting
US20110265653A1 (en) * 2008-11-26 2011-11-03 Eads Deutschland Gmbh Device for collecting particles that have a strong electron affinity
US8852325B2 (en) * 2008-11-26 2014-10-07 Eads Deutschland Gmbh Device for collecting particles that have a strong electron affinity

Also Published As

Publication number Publication date
GB1151026A (en) 1969-05-07
FR1551026A (de) 1968-12-27
DE1557110A1 (de) 1970-03-12
CH466231A (de) 1968-12-15

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