US3803809A - Electrostatic precipitator - Google Patents

Electrostatic precipitator Download PDF

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Publication number
US3803809A
US3803809A US00378343A US37834373A US3803809A US 3803809 A US3803809 A US 3803809A US 00378343 A US00378343 A US 00378343A US 37834373 A US37834373 A US 37834373A US 3803809 A US3803809 A US 3803809A
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United States
Prior art keywords
strips
electrode
edge profiles
collecting electrode
collecting
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Expired - Lifetime
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US00378343A
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English (en)
Inventor
R Gelhaar
J Nitz
K Rau
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GEA Group AG
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Metallgesellschaft AG
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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
    • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
    • 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
    • B03C3/86—Electrode-carrying means

Definitions

  • ABSTRACT An electrostatic precipitator comprising a plurality of collector partitions subdividing the space within a housing into a plurality of flow chambers and adapted to collect, by electrostatic force, particles forming a gas stream traversing the flow passages.
  • the partitions are formed by upright electrode strips having lateral edges which are hooked together loosely in the normal positions of these electrode strips which may forcibly engage one another to prevent distortion of the partition upon thermal deformation of the strips.
  • the outermost strips are provided with rigid profile support members which are hooked around theedges of the outermost strips throughout the height thereof.
  • Our present invention relates to electrostatic precipitators and, more particularly, to a collector electrode arrangement for an electrostatic precipitator.
  • the collectorelectrodes In an electrostatic precipitator for the recovery of solid particles from a gas stream, it is convenient to provide the collectorelectrodes as a plurality of generally parallel and preferably upright conductive partitions'which define conductive partitions which define between them generally flat channels or flow paths for the gas stream. Corona-discharge electrodes in the form of wires or the like may be provided in arrays between the collector electrodes and a dust or particle collecting bin is formed below the collector electrodes. The collector electrode shed the accumulated dust and solid particles when vibrated by a rapper which pro vides impact at a rigid member of a structure attached to the electrodes.
  • the gases which are to be freed from their solids or dust contain particles from metallurgical plants, e.g. iron-or sintering plants, difficulties have arisen with respect to distortion of the partitions or electrode walls forming the collector means of the precipitator. This is because the particles accumulated on the collector surfaces are pyrophoric or other highly active matter and undergo localized flameless combustion to locally heat the collector electrodes.
  • the flameless combustion When the collector electrodes are composed of coldrolled steel strips under considerable internal stress, the flameless combustion generates stress-relief temperatures and gives rise to local distortion in the form of twisting, bending or bulging, especially where the strips are relatively long and narrow.
  • the corona-discharge path between the collecting electrode strips and the discharge or ionizing electrodes is reduced and flash-over breakdown occurs at such locations of close approach of the collector electrodes to the discharge electrodes. It may thus be necessary to reduce the voltage level which may be employed and thus the degree of separation or efficiency is also reduced.
  • the interruption of the profile of the collecting electrode strip moreover prevents vibration thereof so that shedding of the accumulated dust and particles is restricted and efiiciency is reduced.
  • dust does collect at regions which are remote from those at which rapping is applied and the connecting elements may also create disturbance or vortices in the flowing stream which draw the dust particles from the surface of the collector plates or strips and cause entrainment of the dust particles. It will be readily apparent that systems in which the profile of the electrode strip is interrupted or the electrode strip is shortened excessively reduce the shedding efficiency or otherwise introduce difficulties in the overall operational characteristics of the electrostatic precipitator.
  • each of the collector electrodes is formed by a plurality of laterally adjoining strips interconnected in a tongue and groove arrangement so that they lie in mutual contat over the entire length of the interfitting portions.
  • the principal object of the present invention is to provide an improved collector electrode assembly for an electrostatic precipitator in which the aforedescribed disadvantages are obviated.
  • a collector-electrode arrangement which comprises an upper support member, a lower support member and a plurality of geometrically identical profile cold-rolled metal strips affixed to the upper and lower members and having profile edges loosely interfitting fitting with one another.
  • the invention resides in providing profile backing members along the outer edges of the two outermost strips to envelope the edge profiles thereof in a non-rotatable manner, the backing members being hooked around the edges of the outermost strips throughout the height thereof.
  • the adjacent collector electrode strips of each wall or partition are loosely hooked into one another so that during normal operation and without thermal distortion there is no contact between the two adjacent electrode strips at their interfitting edge profiles.
  • hooking around is intended to define the relationship whereby the backing member is rotated and simultaneously shifted laterally over the outer edge of the outer strip upon insertion of the latter into the former or upon the mounting of the backing strip onto the profiled edge.
  • the width of the mouth of the backing strip in a plane perpendicular to the main electrode plane may be smaller than the width of the profiled outer edge at its maximum whereby the profiled edge of the strip cannot be withdrawn through the mouth in a direction parallel to this plane.
  • the mutually interfitting but initially non-contacting electrode strips are geometrically identical with one another but have been rotated relative to one another through 180 about an axis in the plane of the strip parallel to its longitudinal edge.
  • the edge profile of all of the strips may be generally J-shaped with inwardly opening mouths (i.e.
  • the bight of the J opens toward the center of the electrode on which it is formed), and both bights open toward one another on the ame side of the electrode, rotation of two adjacent strips through 180 relative to one another, enables the J-shaped profiles at the edges of two adjoining strips to interfit with the short shank of each J recess, in the bight of the other.
  • the profiles backing members are held against rotation by a cross-beam extending perpendicularly to the plane of the collecting electrode and connecting a number of the backing strips together.
  • the backing strips thus space the free edges of the collecting electrodes from one another.
  • the structure enables cold-rolled electrode strips to be employed and is effective with electrode strips having a length up to the preferred maximum of meters.
  • the profiled backing members only engage the profiled outer edges of the strips loosely in the absence of distortion and hence there is little impediment to vibration under normal operating systems.
  • FIG. 1 is a longitudinal cross-sectional view, partly in diagrammatic form, of the collector electrode of an electrostatic precipitator embodying the present invention
  • FIG. 2 is a cross-sectional view taken along the line IIII of FIG. 1, the corona-discharge electrode array having been omitted.
  • FIG. 3 is a detail view corresponding to FIG. 2 and taken generally along the line [IIIII of FIG. 1, illustrating the interfitting of the packing strips and generally showing the edge profile of another embodiment of an electrode strip according to the invention;
  • FIG. 4 is a detail cross-section taken along the line IV-IV of FIG. 1 but illustrating diagrammatically the edge profile of a pair of electrode strips according to the invention wherein the profiles have the configuration shown in FIG. 3;
  • FIG. 4A is a corresponding view using the strip of FIG. 3A.
  • FIG. 1 we show a collecting electrode for an electrostatic precipitator in which a plurality of individual collecting electrode strips 1, l are provided in mutually adjacent and interlocked relationship. The outermostelectrode strips are designated at 1' while the strips intermediate the outermost strips have been indicated at l.
  • the collecting electrode strips 1, l are cold rolled profiled steel strip have a height of 15 meters and are identical to one another with a symmetrical profile formed with recesses constituting a collecting space for the dust.
  • the strips have reverse bent edges and the edges of the adjacent collecting strips are hooked one into the other (FIGS. 2 and 4).
  • the collector electrode strips are secured at their upper ends by strips 2 to a carrier 3 which rests on the housing structure of the electrostatic precipitator 4. At their lower ends, the collecting electrodes are connected to a common bar 5 which, in turn, is struck by a conventional rapping linkage. The vibration thereby transmits to the wall formed by the strips 1, 1' releases the accumulated dust which falls into a bin below the bar 5.
  • the profiled backing members cannot simply be pushed over the profiled edge portions of the collecting electrode strips 1' and must be hooked therearound by lateral insertion and rotation.
  • a cross-beam 7 which also serves to maintain the distance between adjacent walls.
  • FIG. 2 we show one embodiment of a profiled cold-rolled electrode strip embodying the invention.
  • the strips 1 or 1' may be subdivided into three longitudinally extending sections 1a, lb and 1c of trapezoidal cross-section and equal width.
  • the altitude of each trapezoid may be equal to the height of the edge profiles Id and 1e along the longitudinal edges of each plate.
  • the edge profile may be generally J-section members (see FIGS. 3 and 3A) and may be identical for the end members 1' and the inner members 1.
  • the second member from the left is identical to the left-hand end member l but is rotated relatively thereto through 180 about an axis lying in the plane of the electrode strip and extending parallel to the longitudinal edge.
  • the alternate electrode strips 1' or 1 thus have the same orientation.
  • the edges of adjoining strips are hooked together as shown in FIGS. 4 and 4A.
  • the edge profiles are .l-section members in which the bight 1/1 is generally planar and includes an obtuse angle a with the adjoining web portion 1r, the shank 1k including an acute angle B with the base 1h.
  • the angle [-3 is some degrees less than that of the supplementary angle to angle a so that the shank 1k converges toward the web Hi to define a mouth 1m whose width is less than the altitude In of the profile.
  • edge profile of FIG. 4A in which, however, the bight 1h lies perpendicular to the web portion 1i. Again the two edge profiles are hooked into one another.
  • FIGS. 3 and 3A For the outer edge profiles seen in FIGS. 3 and 3A, there are provided the aforementioned backing members of a corresponding profile as will be described in greater detail hereinafter.
  • the plates 1 shown in FIGS. 3 and 3A are formed with narrow trapezoidal ribs 1a with a transverse spacing equal to a multiple of the transverse width of each rib.
  • other corrugated patterns may be used to form the dust-catching pockets and web-stiffening members of the collecting electrode sheets.
  • the edge profile of the electrode strip 1 shown in FIG. 3 has an altitude 11 which is greater than the effective width 12 of the mouth of backing member 6.
  • the latter is generally of U-configuration having a bight 13 connected to a bolt 14 which is received in a nut 15 to which the crossbar 7 is anchored.
  • a double-nut arrangement in which a nut 15a is threaded onto the bolt 14 on one side of the bar 7 and is locked by a nut 15b threaded onto the other side, may also be used.
  • a pair of shanks 16, 17 extend from the bight and are adapted to surround the profile 10, the shank 17 being bent as shown in FIG. 3 to allow the profile to be inserted in the direction of arrow 18 and then rotated around in the clockwise sense to fit the profile of the electrode strip into the profile backing member 6.
  • the profile backing member 6' of FIG. 3A likewise is similar to the edge profile 10 of the electrode strip with a mouth 12' having a width less than the altitude ll of the edge profile of the electrode strip so that again the edge profile must be inserted into member 6' and relative rotation is effected.
  • a distortion or twisting of the collecting electrode strips causes the profiles of adjacent strips to seize one another whereby the individual collecting electrode strips on which flameless combustion has occurred cannot turn or move out of the plane of the plate wall.
  • a lateral yielding of the outermost strips 1' is prevented by the profiled backing members 6 and 6, even in the case of strips having a height of 15 meters and the entire array of electrode strips remains generally planar.
  • a collecting electrode comprising a generally planar array of substantially contiguous longitudinally extending collectingelectrode strips having edge profiles loosely hooked into the edge profiles of adjoining strips; means supporting said strips at the top thereof; a common rapping linkage connected to said strips at the bottom thereof, said strips including a pair of outer strips having outer edge profiles; respective profile backing members receiving said outer edge profiles and hooked therearound throughout the height of the electrode strips; and means for preventing relative rotation of said backing members and said outer edge profiles.
  • the collecting electrode defined in claim 2 wherein the last-mentioned means includes crossbeams secured to the backing members of a multiplicity of collecting electrodes in mutually spaced relation in said electrostatic precipitator.
  • edge profiles each include a bight extending away from a web portion of the respective strip and a shank including an acute angle with the respective bight and inclined toward the respective web portion, said backing members being of a profile generally similar to said edge profiles and being formed with mouths having a width less than the altitudes of the edge profile.

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  • Electrostatic Separation (AREA)
US00378343A 1972-07-13 1973-07-11 Electrostatic precipitator Expired - Lifetime US3803809A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2234368A DE2234368C3 (de) 1972-07-13 1972-07-13 Elektrostatischer Staubabscheider

Publications (1)

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US3803809A true US3803809A (en) 1974-04-16

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US00378343A Expired - Lifetime US3803809A (en) 1972-07-13 1973-07-11 Electrostatic precipitator

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US (1) US3803809A (ja)
JP (1) JPS5639940B2 (ja)
AR (1) AR199571A1 (ja)
AT (1) AT337313B (ja)
BE (1) BE802289A (ja)
BR (1) BR7305257D0 (ja)
CA (1) CA998007A (ja)
CS (1) CS180619B2 (ja)
DE (1) DE2234368C3 (ja)
ES (1) ES415617A1 (ja)
FR (1) FR2192878B1 (ja)
GB (1) GB1404389A (ja)
IT (1) IT998223B (ja)
LU (1) LU67693A1 (ja)
NL (1) NL150691B (ja)
RO (1) RO70760A (ja)
SE (1) SE379652B (ja)
ZA (1) ZA733444B (ja)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007023A (en) * 1974-07-12 1977-02-08 Metallgesellschaft Aktiengesellschaft Electrostatic precipitator with collector-electrode spacers
US4058377A (en) * 1975-08-12 1977-11-15 Metallgesellschaft Aktiengesellschaft Dust collecting electrostatic precipitator
US4263023A (en) * 1979-02-06 1981-04-21 Metallgesellschaft Aktiengesellschaft Multizone electrostatic precipitator
US4516992A (en) * 1983-11-28 1985-05-14 Jonelis Robert E Apparatus and method for straightening electrostatic precipitator collector plates
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
US6951580B1 (en) 2004-04-13 2005-10-04 Nisource Corporate Services Company Method for minimizing bowing of collector plates in an electrostatic precipitator, and a collector plate-clip combination
EP1792659A1 (en) * 2005-11-30 2007-06-06 VTT Industrial Systems Design of an electrostatic precipitator
US20070193449A1 (en) * 2006-02-21 2007-08-23 Alstom Technology Ltd. Method and apparatus for preventing wear in an electrostatic precipitator
WO2013126143A1 (en) * 2012-02-22 2013-08-29 Clearsign Combustion Corporation Cooled electrode and burner system including a cooled electrode
CN106861908A (zh) * 2017-03-03 2017-06-20 中冶宝钢技术服务有限公司 烧结机电除尘器维修工艺

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711858C2 (de) * 1977-03-18 1984-12-13 Saarbergwerke AG, 6600 Saarbrücken Elektroabscheider mit Niederschlagselektroden
JP4877527B2 (ja) * 2008-03-21 2012-02-15 株式会社日立プラントテクノロジー 乾式電気集塵機用集塵極板。

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1773876A (en) * 1925-08-27 1930-08-26 Int Precipitation Co Apparatus for electrical precipitation of suspended material from gases
DE533848C (de) * 1926-10-28 1931-09-19 Oski Akt Ges Niederschlagselektrode fuer elektrische Gasreiniger
US1903640A (en) * 1931-08-22 1933-04-11 Research Corp Electrical precipitator
US3008541A (en) * 1957-05-23 1961-11-14 Metallgesellschaft Ag Precipitating electrodes for electrofilters
GB963109A (en) * 1962-07-04 1964-07-08 Metallgesellschaft Ag A collecting electrode for an electrostatic precipitator
US3328940A (en) * 1963-12-18 1967-07-04 Metallgesellschaft Ag Electrostatic gas filter electrode
US3362135A (en) * 1966-01-07 1968-01-09 Metallgesellschaft Ag Electrostatic dust filter
US3417519A (en) * 1965-10-22 1968-12-24 Joseph S. Hitter Sheet panel structure
US3748831A (en) * 1971-06-03 1973-07-31 Svenska Flaektfabriken Ab Device for electric precipitator
US3755991A (en) * 1970-06-20 1973-09-04 Metallgesellschaft Ag Collector electrode for electrostatic precipitator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE634524A (ja) *

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1773876A (en) * 1925-08-27 1930-08-26 Int Precipitation Co Apparatus for electrical precipitation of suspended material from gases
DE533848C (de) * 1926-10-28 1931-09-19 Oski Akt Ges Niederschlagselektrode fuer elektrische Gasreiniger
US1903640A (en) * 1931-08-22 1933-04-11 Research Corp Electrical precipitator
US3008541A (en) * 1957-05-23 1961-11-14 Metallgesellschaft Ag Precipitating electrodes for electrofilters
GB963109A (en) * 1962-07-04 1964-07-08 Metallgesellschaft Ag A collecting electrode for an electrostatic precipitator
US3328940A (en) * 1963-12-18 1967-07-04 Metallgesellschaft Ag Electrostatic gas filter electrode
US3417519A (en) * 1965-10-22 1968-12-24 Joseph S. Hitter Sheet panel structure
US3362135A (en) * 1966-01-07 1968-01-09 Metallgesellschaft Ag Electrostatic dust filter
US3755991A (en) * 1970-06-20 1973-09-04 Metallgesellschaft Ag Collector electrode for electrostatic precipitator
US3748831A (en) * 1971-06-03 1973-07-31 Svenska Flaektfabriken Ab Device for electric precipitator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
German Printed Application No. 1,158,043, printed 11 28 63, 1 sheet drawing, 2 pages spec.) 11 28 63, *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007023A (en) * 1974-07-12 1977-02-08 Metallgesellschaft Aktiengesellschaft Electrostatic precipitator with collector-electrode spacers
US4058377A (en) * 1975-08-12 1977-11-15 Metallgesellschaft Aktiengesellschaft Dust collecting electrostatic precipitator
US4263023A (en) * 1979-02-06 1981-04-21 Metallgesellschaft Aktiengesellschaft Multizone electrostatic precipitator
US4516992A (en) * 1983-11-28 1985-05-14 Jonelis Robert E Apparatus and method for straightening electrostatic precipitator collector plates
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
US6951580B1 (en) 2004-04-13 2005-10-04 Nisource Corporate Services Company Method for minimizing bowing of collector plates in an electrostatic precipitator, and a collector plate-clip combination
US20050223892A1 (en) * 2004-04-13 2005-10-13 Nisource Corporate Services Company Method for minimizing bowing of collector plates in an electrostatic precipitator, and a collector plate-clip combination
EP1792659A1 (en) * 2005-11-30 2007-06-06 VTT Industrial Systems Design of an electrostatic precipitator
US20070193449A1 (en) * 2006-02-21 2007-08-23 Alstom Technology Ltd. Method and apparatus for preventing wear in an electrostatic precipitator
US7438742B2 (en) * 2006-02-21 2008-10-21 Alstom Technology Ltd Method and apparatus for preventing wear in an electrostatic precipitator
WO2013126143A1 (en) * 2012-02-22 2013-08-29 Clearsign Combustion Corporation Cooled electrode and burner system including a cooled electrode
CN106861908A (zh) * 2017-03-03 2017-06-20 中冶宝钢技术服务有限公司 烧结机电除尘器维修工艺

Also Published As

Publication number Publication date
AT337313B (de) 1977-06-27
AR199571A1 (es) 1974-09-13
CS180619B2 (en) 1978-01-31
NL7309718A (ja) 1974-01-15
ZA733444B (en) 1974-04-24
ATA442173A (de) 1976-10-15
DE2234368C3 (de) 1979-06-28
FR2192878A1 (ja) 1974-02-15
FR2192878B1 (ja) 1977-09-16
IT998223B (it) 1976-01-20
SE379652B (ja) 1975-10-20
DE2234368B2 (de) 1978-11-02
CA998007A (en) 1976-10-05
LU67693A1 (ja) 1973-08-02
BE802289A (fr) 1974-01-14
NL150691B (nl) 1976-09-15
ES415617A1 (es) 1976-01-16
RO70760A (ro) 1981-06-30
JPS4958469A (ja) 1974-06-06
DE2234368A1 (de) 1974-01-24
JPS5639940B2 (ja) 1981-09-17
BR7305257D0 (pt) 1974-08-15
GB1404389A (en) 1975-08-28

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