WO1998022223A1 - Electrode a effet de couronne pour un systeme filtrant destine a separer les impuretes contenues dans un flux gazeux, systeme filtrant contenant ce type d'electrode et son mode de fonctionnement - Google Patents

Electrode a effet de couronne pour un systeme filtrant destine a separer les impuretes contenues dans un flux gazeux, systeme filtrant contenant ce type d'electrode et son mode de fonctionnement Download PDF

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Publication number
WO1998022223A1
WO1998022223A1 PCT/CH1997/000438 CH9700438W WO9822223A1 WO 1998022223 A1 WO1998022223 A1 WO 1998022223A1 CH 9700438 W CH9700438 W CH 9700438W WO 9822223 A1 WO9822223 A1 WO 9822223A1
Authority
WO
WIPO (PCT)
Prior art keywords
curvature
corona
electrodes
corona electrode
plate
Prior art date
Application number
PCT/CH1997/000438
Other languages
German (de)
English (en)
Inventor
Walter Egli
Ulrich Kogelschatz
Original Assignee
Abb Research Ltd.
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 Abb Research Ltd. filed Critical Abb Research Ltd.
Priority to AU48607/97A priority Critical patent/AU4860797A/en
Publication of WO1998022223A1 publication Critical patent/WO1998022223A1/fr

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Classifications

    • 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
    • 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
    • B03C3/66—Applications of electricity supply techniques
    • 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
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/10—Ionising electrode has multiple serrated ends or parts

Definitions

  • Corona electrode for a filter arrangement for separating contaminants from a gas stream, filter arrangement with corresponding corona electrodes and method for their operation
  • the invention relates to a corona electrode for a filter arrangement for separating contaminants from a gas stream, a filter arrangement with corresponding corona electrodes and a method for operating the same.
  • a filter arrangement of the structure described is e.g. B. known from the brochure S. Matts: 'Fläkt Electrostatic Precipitators' from ABB Asea Brown Boveri.
  • the corona electrodes are designed there as straight wire helices.
  • the risk of back spraying thus limits the field strength to which the dust layer may be exposed and thus the current density through the dust layer and thus ultimately the separation performance of the filter arrangement.
  • the electric field in the filter lane should be as high as possible.
  • the average field strength is primarily limited by the fact that, in the case of high-resistance dusts at the corona electrodes, where the field strength is greatest, there are no corona discharges between the voltage pulses become. Corona formation should only occur during the voltage pulses if possible.
  • a high density of corona electrodes leads to a more homogeneous field, but too many charge carriers are generated during the voltage pulses, which, as already mentioned, favors the back-spraying.
  • Bends only serve to mechanically reinforce the electrode by means of angled reinforcement strips, that is to say not by weld seams connected to it.
  • the corona electrodes are each designed as a flat rectangular plate which, for stiffening, has round flanges at its edges or obtuse-angled and then acute-angled profile strips which each extend over their entire height and form a narrow convex zone of curvature.
  • the flanges or profile strips each have press-made, vertically spaced, laterally projecting wart-like projections of approximately hemispherical shape and a larger curvature, on which the corona formation is to occur above all.
  • the invention is intended to remedy this.
  • the invention as characterized in the claims, creates a corona electrode with which it is possible to maintain a homogeneous electric field in the filter lane and at the same time to produce charge carriers on the limit the desired extent.
  • This option is used as advantageously as possible in the filter arrangement according to the invention, in particular if it is operated in accordance with the method according to the invention.
  • the advantages achieved by the invention are primarily that the high average field strength in the filter lane exerts large forces on the particles to be separated and the particles are transported at high speed against the separation electrodes, so that a high transport and separation performance is maintained. Thanks to the homogeneity of the field and the absence of strong local elevations, the average field strength can be approached relatively close to the limit, which leads to breakdowns in the dust layer or in the gas space.
  • the formation of corona and thus the production of charge carriers can be largely independent of that by specifically arranging zones of curvature, in which corona formation occurs preferably only and exclusively during the voltage pulses
  • Formation of the electric field in the filter lane can be set to desired values. Overall, a very high performance of the filter arrangement can be achieved by pushing back factors which favor the back spraying. Due to the continuous formation of the curvature zones over the entire height of the corona electrodes, all flow trajectories are also completely captured by the cleaning mechanism.
  • the invention is explained in more detail below with reference to figures which merely represent exemplary embodiments. Show it
  • FIG. 1 shows a longitudinal section through the flow direction of the gases through part of a filter lane of a filter arrangement according to the invention with corona electrodes according to the invention according to a first embodiment
  • FIG. 2a shows the electrical potential between a corona electrode according to the first embodiment and a deposition electrode when a DC voltage is applied
  • Fig. 3 shows a longitudinal section through part of a filter passage of a second inventive
  • FIG. 4 shows a longitudinal section through part of a filter lane of a filter arrangement according to the invention with corona electrodes according to a second embodiment according to the invention and 5 shows a longitudinal section through part of a filter lane of a filter arrangement according to the invention with corona electrodes according to a third embodiment according to the invention.
  • the filter arrangement according to the invention has a plurality of separation electrodes 1, which are at a distance of, for. B. 40 cm are arranged side by side and z. B. consist of three 5 m high stacked steel plates. Two adjacent separating electrodes 1 form between them a filter lane 2, through which a gas stream loaded with ash or other dust-like or droplet-like impurities is passed in the direction of the arrow. Successive corona electrodes 3 are arranged in the center of the filter alley 2. The same extend over the entire filter lane 2. Their height is therefore 15 m in the example described, although they can of course be composed of several sections like the separating electrodes 1.
  • a DC voltage is applied by means of a high-voltage generator 4, which, for. B. can be 60 kV.
  • This DC voltage is at a repetition rate, which, for. B. between 10 and 100 Hz and preferably not above 20 Hz, of short, z. B. superimposed about 10 to 100 ⁇ s voltage pulses, which have a peak value of, for example, 26 kV, so that the voltage reaches peak values of 86 kV overall.
  • the DC voltage is chosen so that it is high electric field generated in the filter lane, but does not lead to corona formation on the corona electrodes.
  • the corona electrodes 3 always form the negative pole.
  • the corona electrodes 3 are as flat rectangular plates 5 made of preferably 0.4-1.5 mm thick steel or
  • each corona electrode 3 is provided with a zone of curvature 6, in the area of which
  • Surface is strongly convexly curved. It is preferably produced by flanging the sheet and has the shape of a cylinder sector. Your radius of curvature is z. B. between 2 and 5 mm, preferably it is not larger than 4 mm.
  • the curvature zones 6 each extend over the entire height of the filter lane 2, so that each
  • curvature zones 6 form the parts which protrude furthest to the side and have an approximately uniform curvature over their length.
  • the corona electrodes 3 are preferably between 10 and 40 cm long and follow one another at intervals of 20 to 50 cm.
  • the plate-shaped design of the corona electrodes 3 forms an electric field in the filter alley 2, which is extremely homogeneous, particularly in the vicinity of the deposition electrode 1. This can be seen very well from FIG. 2a, where isolines are drawn in at a distance of 2 kV of that electrical potential, which forms while the DC voltage of 60 kV is present.
  • the field strength in the area adjoining the deposition electrode 1 is approximately 2.4 kV / cm. No corona discharges occur at the curvature zones 6 when the DC voltage is present.
  • the production of charge carriers can largely be influenced by several parameters independent of the generation of the electric field.
  • the density of the curvature zones 6 in the flow direction of the gas is decisive for this. It can be set as desired by the distance between successive corona electrodes 3 and the length thereof in the flow direction.
  • the strength of the corona discharges and the lower limit voltage for their occurrence can also be set by appropriately selecting the radius of curvature in the curvature zones 6 - in the present case the radius of the cylindrical flanges.
  • the supply in particular the adjustment of the length, height and repetition frequency of the voltage pulses, also offers the possibility of influencing the production of charge carriers.
  • the structure and supply of the filter arrangement must be so are coordinated so that the desired functionality - with corona formation only during the voltage impulses and favorable charge carrier density - is achieved.
  • the arrangement of the corona electrodes 3 according to FIG. 1 is almost ideal in terms of the homogeneity of the electric field.
  • corona electrodes 3 of the same design are inclined with respect to the flow direction, i. H. fixed about a central axis rotated parallel to the edges of the plate 5, alternately in the opposite direction. This reduces the effective electrical aisle width.
  • the inclination of the corona electrodes 3 is therefore particularly suitable for the entrance area or for use in the area of waste heat boilers, where due to space charge
  • Corona suppression requires higher field strengths to trigger corona discharges. In addition, the robustness against malfunctions and assembly tolerances is higher.
  • the design of the filter arrangement according to FIG. 4 has similar properties. She is with
  • Corona electrodes 3 each having a rectangular central plate 5a, which is aligned parallel to the deposition electrodes 1 and front and rear at an obtuse angle on opposite sides of shorter shorter plates 5b, which are also rectangular. At their free edges, the edge plates 5b have curvature zones 6 designed as flanges. 5 has corona electrodes 3 according to a third embodiment, in which two edge plates 5b connect symmetrically to the front and rear of the middle plate 5a, which project in a V-shape on opposite sides at an obtuse angle from the middle plate 5a . At their free edges, all edge plates 5b have curvature zones 6 designed as flanges. Due to the higher number of curvature zones, this design tends to result in a higher production of load carriers.

Landscapes

  • Electrostatic Separation (AREA)

Abstract

Pour uniformiser le champ électrique dans une voie filtrante (2) limitée par deux électrodes de séparation (1) d'un système filtrant destiné à séparer les impuretés sous forme de poussières ou de gouttelettes contenues dans un flux gazeux, on utilise des électrodes à effet de couronne (3) conçues sous forme de plaques - p.ex. avec une plaque centrale (5a) prolongée en amont et en aval par des plaques de bordure (5b) en saillie dans des sens opposés en formant un angle obtu - et dont les bords antérieurs et postérieurs possèdent respectivement une zone incurvée (6) continue produite par un bord rabattu, avec un rayon de courbure compris entre 2 et 5 mm. Ces zones incurvées qui possèdent sur leur longueur une courbure sensiblement uniforme, constituent les parties les plus saillantes latéralement. La distance moyenne des zones incurvées (6) consécutives et la formation de ces dernières permettent de commander la production de porteurs de charge pour le nettoyage électrostatique tout en empêchant une surproduction qui favorise une rétropulvérisation. Une effluve se produit exclusivement pendant les impulsions de tension et uniquement au niveau des zones incurvées (6).
PCT/CH1997/000438 1996-11-21 1997-11-18 Electrode a effet de couronne pour un systeme filtrant destine a separer les impuretes contenues dans un flux gazeux, systeme filtrant contenant ce type d'electrode et son mode de fonctionnement WO1998022223A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU48607/97A AU4860797A (en) 1996-11-21 1997-11-18 Corona electrodes for a filter structure for separating impurities from a flow of gas, filter structure with corresponding corona electrodes and method of operation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19648182.1 1996-11-21
DE1996148182 DE19648182A1 (de) 1996-11-21 1996-11-21 Koronaelektrode für eine Filteranordnung zum Abscheiden von Verunreinigungen aus einem Gasstrom, Filteranordnung mit entsprechenden Koronaelektroden sowie Verfahren zu ihrem Betrieb

Publications (1)

Publication Number Publication Date
WO1998022223A1 true WO1998022223A1 (fr) 1998-05-28

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PCT/CH1997/000438 WO1998022223A1 (fr) 1996-11-21 1997-11-18 Electrode a effet de couronne pour un systeme filtrant destine a separer les impuretes contenues dans un flux gazeux, systeme filtrant contenant ce type d'electrode et son mode de fonctionnement

Country Status (3)

Country Link
AU (1) AU4860797A (fr)
DE (1) DE19648182A1 (fr)
WO (1) WO1998022223A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1829614A1 (fr) * 2006-03-02 2007-09-05 Technische Universiteit Delft Procédé pour enlever le fumeron, poussières fines et particules des gaz d'échappement, appareil collecteur de particules pour l'utilisation dans ce procédé et utilisation de cet appareil pour générer d'un champ électrique statique
UA114067C2 (xx) * 2016-12-08 2017-04-10 Спосіб інактивації мікроорганізмів у повітрі та електричний стерилізатор

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200566A (en) * 1961-07-12 1965-08-17 Svenska Flaektfabriken Ab Emission electrode for electrostatic precipitators
JPS57197052A (en) * 1981-05-27 1982-12-03 Hitachi Plant Eng & Constr Co Ltd Discharge electrode for electric dust collecting apparatus
JPH0418945A (ja) * 1990-04-28 1992-01-23 Toshiba Corp 電気集塵器
JPH08117638A (ja) * 1994-10-24 1996-05-14 Giichi Terasawa 空気清浄器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI41381B (fr) * 1960-05-12 1969-07-31 Svenska Flaektfabriken Ab
DE3409155A1 (de) * 1984-03-13 1985-09-19 Siemens AG, 1000 Berlin und 8000 München Einrichtung zur spannungsversorgung eines elektrofilters
DE8913974U1 (fr) * 1989-11-27 1990-04-05 Szentendrei Epitoeipari Szoevetkezet, Szentendre, Hu

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200566A (en) * 1961-07-12 1965-08-17 Svenska Flaektfabriken Ab Emission electrode for electrostatic precipitators
JPS57197052A (en) * 1981-05-27 1982-12-03 Hitachi Plant Eng & Constr Co Ltd Discharge electrode for electric dust collecting apparatus
JPH0418945A (ja) * 1990-04-28 1992-01-23 Toshiba Corp 電気集塵器
JPH08117638A (ja) * 1994-10-24 1996-05-14 Giichi Terasawa 空気清浄器

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 046 (C - 153) 23 February 1983 (1983-02-23) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 176 (C - 0934) 27 April 1992 (1992-04-27) *
PATENT ABSTRACTS OF JAPAN vol. 096, no. 009 30 September 1996 (1996-09-30) *

Also Published As

Publication number Publication date
DE19648182A1 (de) 1998-05-28
AU4860797A (en) 1998-06-10

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