US3158453A - Emission electrode system - Google Patents

Emission electrode system Download PDF

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Publication number
US3158453A
US3158453A US43169A US4316960A US3158453A US 3158453 A US3158453 A US 3158453A US 43169 A US43169 A US 43169A US 4316960 A US4316960 A US 4316960A US 3158453 A US3158453 A US 3158453A
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Prior art keywords
electrodes
emitting
rows
gas
units
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Expired - Lifetime
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US43169A
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English (en)
Inventor
Maartman Sten
Gustafsson Stig
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Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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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
    • B03C3/41—Ionising-electrodes

Definitions

  • the present invention relates to an emission electrode system for electric precipitators and comprises a plurality of electrodes suspended in frames. With the everincreasing overall height aimed at for electric precipitators, it has proved diflicult to provide for cleansing the electrodes by simple conventional means. In this connection especially the cleansing of the emission electrodes has involved a troublesome problem.
  • the emission electrodes for several reasons, cannot be constructed with the same mechanical rigidity, or stiffness, as it is possible to attain by simple expedients for the precipitation electrodes. Therefore, it has been necessary in the past to subdivide the emission electrode system into a plurality of sections, one above the other and each provided with its individual rapping device. Such construction, however, turns out to be very expensive. In addition, such a construction necessitates an unfavourable disposition of the elements forming part of the rapping device relative to the path of the gas flow through the electric precipitator.
  • the invention has for its object to enable cleansing of the emission electrodes by the use of one single beating device disposed adjacent the bottom ends of the electrodes.
  • the beating device can be of a design identical to that used for the precipitation electrodes which, of course, means saving of labour and expenses.
  • the novel and characterizing feature of the emission electrode system according to the invention resides in that the electrodes are combined into units each containing two or more electrodes by means of members acting as stifleners.
  • the stiiener may extend substantially throughout the length of the electrodes, or the emission electrodes may alternatively be combined by means of a plurality of stiieners distributed throughout the length of the electrodes.
  • the electrodes of the emission electrode system suitably consist of strips known per se having smooth or toothed edges and, in this case, the stiifener may be constituted by a sheet-metal strip of a configuration substantially the same as that of the precipitation electrodes used in the precipitator.
  • the emission electrode system could also be made with the stiiener as an integral part of the emission electrodes.
  • FIG. l is a vertical sectional view of a portion of a precipitator made in accordance with the present invention.
  • FIG. la is a vertical sectional view like FIG. 1 but showing another portion of the precipitator and a modiied form of reinforcing means;
  • FIG. 2 is an enlarged horizontal section through a number of electrodes arranged as in FIG. l or FIG. la, showing an emission electrode disposed between two precipitation electrodes.
  • FIG. 3 is a fragmentary side elevational view of the emission electrode of FIG. 2;
  • FIG. 4 is a view similar to FIG. 3 showing an emission electrode having toothed side edges.
  • FIG. 5 is a horizontal section on a reduced scale of the apparatus shown in FIG. l'.
  • two emission electrodes 1 of strip plate form are connected by a plate-like stiifener 2, as of sheet metal having its principal plane disposed transversely or at right angles to the planes of the electrode plates 1, to form a transversely stiff rigid unit 3.
  • FIG. la shows a form like that of FIG. 1 but in which the stitfeners 2a are made in short sections instead of continuous lengths to connect the plate electrodes 1a to form a rigid unit 3a. Said units at their top ends are pivotally mounted in a framework 4 which is insulated from the casing 5 of the electric precipitator.
  • Numeral 7 designates a plurality of precipitation electrodes disposed on both sides of the emission electrodes. The electrodes are pivotally suspended from a framework 8 which is rigidly connected with the casing 5 of the electric precipitator.
  • Numeral 9 designates a rapping or beating device of a conventional design for cleansing the emission electrodes.
  • the rapping device is arranged to actuate a beating rod 10 disposed beneath the electrodes, this rod being made of double flat iron bars and provided with abutments 11 inserted between these bars.
  • the emission electrodes are suspended by means of sheet-metal brackets 13 engaging slots 14 formed in the framework 4.
  • the beating device for the precipitation electrodes is of similar design, but both could be of any other suitable design of course.
  • the units 3 and 3a are generally similar.
  • the units 3 at the left hand side of FIG. l include continuous stiffening members 2 coextensive with the electrodes 1.
  • the units 3a at the right hand side of FIG. 1 include stitfening members 2a which are composed of a plurality of short sections disposed in spaced relation longitudinally of the electrodes 1a.
  • FIG. 2 of the drawing the parts shown are provided with reference numerals identical to those of FIG. l.
  • the electrodes shown therein consist of sheet-metal strips having smooth edges 16 (see FIG. 3), as previously known per se.
  • the electrodes may be modified as shown at 1b in FIG. 4 by providing teeth on the edges such as shown at 16h.
  • the stilfening member 2 is of a configuration substantially the same as that of the precipitation electrodes 7 used in the precipitator.
  • An electrostatic precipitator comprising a casing adapted to have a gas to be cleaned owing therethrough, a plurality of emitting and collecting electrodes in said casing, means pivotally suspending said electrodes in said casing in rows aligned longitudinally with the direction of flow of gas to be cleaned, the rows in a direction transversely of the direction of gas flow being arranged in alternating rows of emitting and collecting electrodes, each row of said emitting electrodes comprising a plurality of longitudinally spaced substantially iiat strips disposed transverse to the direction of iow of the gas to be cleaned, interconnecting stiiening means secured between 4and uniting said strips in pairs, said stiflening means each comprising a sheet metal member having an intermediate web and attachment element on opposite sides of said intermediate web, said attachment elements each being secured to a respective one of said strips, rapping means operatively connected to the bottom ends of said emitting and collecting electrodes and arranged to rap the electrodes in the direction of the length of the rows of electrodes,

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  • Electrostatic Separation (AREA)
US43169A 1959-10-21 1960-07-15 Emission electrode system Expired - Lifetime US3158453A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE980559 1959-10-21

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BE (1) BE588920A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200565A (en) * 1961-07-12 1965-08-17 Svenska Flaektfabriken Ab Electrostatic precipitators
US3257779A (en) * 1961-09-15 1966-06-28 Strubler Gordon Electrostatic agglomerator having an improved discharge electrode structure
US3540191A (en) * 1967-01-31 1970-11-17 Marc Victor Edgard Herman Electrostatic separator
US4303418A (en) * 1977-04-18 1981-12-01 Joy Manufacturing Company Discharge electrode in precipitator
US4375364A (en) * 1980-08-21 1983-03-01 Research-Cottrell, Inc. Rigid discharge electrode for electrical precipitators
US4514195A (en) * 1977-04-18 1985-04-30 Joy Manufacturing Company Discharge electrode
US4647296A (en) * 1985-11-08 1987-03-03 Mississippi Power Company Spacers for straightening warped precipitator curtains
US4765802A (en) * 1987-07-15 1988-08-23 Wheelabrator Air Pollution Control Inc. Electrostatic precipitator plate spacer and method of installing same
US5931989A (en) * 1995-06-20 1999-08-03 Abb Flakt Ab Device in an electrostatic precipitator for the suspending, controlling and rapping of collecting electrodes

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191318357A (en) * 1912-08-13 1915-06-10 Erwin Moeller Method of and Apparatus for Separating Suspended Particles from Gaseous Bodies by Means of High Tension Electricity.
US2195431A (en) * 1935-10-09 1940-04-02 Koppers Co Inc Gas treating apparatus
US2283964A (en) * 1940-02-29 1942-05-26 Westinghouse Electric & Mfg Co Electrical dust precipitator
FR911017A (fr) * 1943-12-29 1946-06-26 Svenska Flaektfabriken Ab électrode de précipitation pour filtres électriques
US2547573A (en) * 1949-04-18 1951-04-03 Research Corp Rapper for electrical precipitation apparatus
US2595204A (en) * 1949-11-25 1952-04-29 Research Corp Electrical precipitation
US2668600A (en) * 1953-04-06 1954-02-09 Research Corp Electrode structure
US2694464A (en) * 1951-02-09 1954-11-16 Research Corp Electrical precipitator
GB747301A (en) * 1954-04-07 1956-04-04 Carves Simon Ltd Improvements relating to collecting electrodes for electrostatic precipitators
US2812035A (en) * 1955-09-09 1957-11-05 Buell Engineering Company Inc Electrostatic precipitator and a collecting electrode therefor

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191318357A (en) * 1912-08-13 1915-06-10 Erwin Moeller Method of and Apparatus for Separating Suspended Particles from Gaseous Bodies by Means of High Tension Electricity.
US2195431A (en) * 1935-10-09 1940-04-02 Koppers Co Inc Gas treating apparatus
US2283964A (en) * 1940-02-29 1942-05-26 Westinghouse Electric & Mfg Co Electrical dust precipitator
FR911017A (fr) * 1943-12-29 1946-06-26 Svenska Flaektfabriken Ab électrode de précipitation pour filtres électriques
US2547573A (en) * 1949-04-18 1951-04-03 Research Corp Rapper for electrical precipitation apparatus
US2595204A (en) * 1949-11-25 1952-04-29 Research Corp Electrical precipitation
US2694464A (en) * 1951-02-09 1954-11-16 Research Corp Electrical precipitator
US2668600A (en) * 1953-04-06 1954-02-09 Research Corp Electrode structure
GB747301A (en) * 1954-04-07 1956-04-04 Carves Simon Ltd Improvements relating to collecting electrodes for electrostatic precipitators
US2812035A (en) * 1955-09-09 1957-11-05 Buell Engineering Company Inc Electrostatic precipitator and a collecting electrode therefor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200565A (en) * 1961-07-12 1965-08-17 Svenska Flaektfabriken Ab Electrostatic precipitators
US3257779A (en) * 1961-09-15 1966-06-28 Strubler Gordon Electrostatic agglomerator having an improved discharge electrode structure
US3540191A (en) * 1967-01-31 1970-11-17 Marc Victor Edgard Herman Electrostatic separator
US4303418A (en) * 1977-04-18 1981-12-01 Joy Manufacturing Company Discharge electrode in precipitator
US4514195A (en) * 1977-04-18 1985-04-30 Joy Manufacturing Company Discharge electrode
US4375364A (en) * 1980-08-21 1983-03-01 Research-Cottrell, Inc. Rigid discharge electrode for electrical precipitators
US4647296A (en) * 1985-11-08 1987-03-03 Mississippi Power Company Spacers for straightening warped precipitator curtains
US4765802A (en) * 1987-07-15 1988-08-23 Wheelabrator Air Pollution Control Inc. Electrostatic precipitator plate spacer and method of installing same
US5931989A (en) * 1995-06-20 1999-08-03 Abb Flakt Ab Device in an electrostatic precipitator for the suspending, controlling and rapping of collecting electrodes

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Publication number Publication date
BE588920A (fr) 1960-07-18

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