EP0377794B1 - Electrofiltre en plastique et/ou en métal, en particulier en plomb - Google Patents

Electrofiltre en plastique et/ou en métal, en particulier en plomb Download PDF

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Publication number
EP0377794B1
EP0377794B1 EP89119212A EP89119212A EP0377794B1 EP 0377794 B1 EP0377794 B1 EP 0377794B1 EP 89119212 A EP89119212 A EP 89119212A EP 89119212 A EP89119212 A EP 89119212A EP 0377794 B1 EP0377794 B1 EP 0377794B1
Authority
EP
European Patent Office
Prior art keywords
tubes
electrofilter
support beams
profiles
walls
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
EP89119212A
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German (de)
English (en)
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EP0377794A1 (fr
Inventor
Peter Heyen
Karl-Heinz Dipl.-Ing. Naumann
Horst Dipl.-Ing. Renneberg
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.)
BG APPARATEBAU GOSLAR GMBH & CO. KG
Original Assignee
Bg Apparatebau Goslar & Co KG GmbH
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 Bg Apparatebau Goslar & Co KG GmbH filed Critical Bg Apparatebau Goslar & Co KG GmbH
Priority to FI895798A priority Critical patent/FI895798A0/fi
Publication of EP0377794A1 publication Critical patent/EP0377794A1/fr
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Publication of EP0377794B1 publication Critical patent/EP0377794B1/fr
Anticipated expiration legal-status Critical
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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
    • B03C3/86—Electrode-carrying means
    • 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
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/06—Plant or installations having external electricity supply dry type characterised by presence of stationary tube 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
    • B03C3/40—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
    • B03C3/40—Electrode constructions
    • B03C3/60—Use of special materials other than liquids

Definitions

  • the invention relates to an electrostatic filter made of plastic and / or metal, in particular lead, as a tube filter with axially parallel tubes with a polygonal cross section and with axially extending spray electrodes in each tube, the walls of the tubes acting as precipitation electrodes and the walls of adjacent tubes lying directly next to one another each aligned and a series of parallel and evenly spaced support beams is provided, which extend over the entire width of the electrostatic filter and support the walls (see US-A-2 853 150).
  • An electrostatic filter is generally understood to mean a device with the aid of which it is possible to separate solid and liquid suspended particles from the carrier gas with the aid of an artificial electrical charge. The charged suspended particles migrate to the precipitation electrode and are then mechanically removed from the filter. Electrostatic precipitators are also known as electrical separators.
  • Such electrostatic precipitators generally consist of spray electrodes which are electrically charged and of walls in the vicinity of the spray electrodes which act as precipitation electrodes.
  • These spray electrodes can be wire-shaped, for example.
  • open alleys are known as the simplest form, i.e. two plates parallel to each other, between which the spray electrodes run at equal intervals in the middle parallel to each other. Due to the inhomogeneous fields, the filter effect is only very unsatisfactory, especially in the area between the wire-shaped spray electrodes.
  • each wall serves as a limitation for two adjacent tubes, which leads to a considerable saving in material and space.
  • filters made of steel or lead which are used, for example, in the wet cleaning of SO2 gases in the sulfuric acid industry. This applies in particular to downstream wet gas cleaning in ore processing with sulfur-containing metal ores, such as pyrrites.
  • lead filters or filters made of solid steel with a lead coating are very heavy, so that care should therefore be taken to use as little material as possible.
  • Material-saving solutions result, for example, from DF 26 41 114 B2, DE-AS 10 01 240 or CA-PS 1 159 773, which each describe honeycomb filters with tubes with a hexagonal cross section - these filters have the advantage of greater homogeneity of the electric field compared to square alley filters, but each wall can still be used for two adjacent tubes.
  • honeycomb filters with hexagonal tubes in cross-section have therefore proven their worth and are well established, but only in plastic in a construction in which there is no need for a suspension, because the plates forming the tube walls are connected to one another over the entire length of the nodal points that arise.
  • hexagonal tubes have a disadvantage that is particularly noticeable in electrostatic filters made of heavy materials. These, especially those made of lead, require plates that are no longer self-supporting. It should be borne in mind that the resulting tubes are sometimes orders of magnitude more reach than 5 m in length. It would therefore be advantageous if the panels that form the walls could be hung in stable supports. With a honeycomb filter, however, it is not possible to provide continuous, stable supports, since the plates are pivoted by 120 ° from corner to corner and zigzag, so to speak.
  • the object of the invention is therefore to propose a generic electrostatic filter which shows the best possible filtering action and can nevertheless be equipped with continuous supports.
  • Such an electrostatic filter is an alley filter.
  • a row of parallel plates can be hung on continuous supports. Nevertheless, a better degree of filtering is achieved compared to the square-lane filter, since the tubes each have an octagonal cross-section.
  • the side surfaces and corners are therefore spaced considerably more evenly from the axially extending spray electrodes, so that no angles and corners can form in which unpurified particle streams can flow.
  • the tubes are regular octagons in cross section. This ensures the greatest possible homogeneity.
  • the walls, which are common to neighboring tubes can be somewhat longer than the others, whereby the proportion of common walls increases above the 50% mark, but the uniformity of the electric field decreases somewhat.
  • a particularly stable construction results if transverse beams are provided perpendicular to the row of the support beams, to which profiles are fastened, which form the walls of the tubes which do not run parallel to the support beams.
  • the beams are also provided with flange projections facing the tubes, which follow the profile of the pipe wall on the face. These flange projections also shut off those shafts in the electrostatic precipitator that lie between the octagonal cross sections of the different tubes. This prevents particularly easily and safely that unpurified gases can get through these shafts.
  • the profiles in cross section form a Y mirrored at its base with a vertical base.
  • the cross-section thus consists of a line, from the two end points of which two arms point symmetrically obliquely outwards. If such profiles are used in an alley, an octagon is formed between two adjacent profiles that are used spaced apart.
  • the arms of the Y also enclose an angle of 135 ° with the foot, a regular octagon as a cross-section of the tubes can be achieved automatically if the distances are correctly dimensioned.
  • a structurally particularly interesting alternative or preferred embodiment arises when vertically running profiles are attached to the walls of the tubes running parallel to the support beams, which form an angle with two legs, both legs being attached to the wall, while the apex to the neighboring one Wall protrudes.
  • a corresponding profile is then arranged symmetrically on the adjacent wall and a wall plate arranged transversely to the walls parallel to the carrier is inserted between the vertices of two mutually opposite profiles.
  • the angular profile can be welded from the outset directly to the continuous longitudinal plates at the uniform distances provided by the intended dimensions of the electrostatic filter. After setting up can then from above between the two vertices the wall plate forming the transverse side are inserted, for which purpose a corresponding groove or other protrusions are provided in the region of the vertex outside.
  • the angle of the profile is 90 °, as a result of which the resulting octagon is formed regularly.
  • the plate can be made in one piece with the crossbeam. Then you can insert the crossbar together with the plate between the two vertices from above during assembly.
  • This construction is structural and particularly simple to assemble and therefore relatively inexpensive and also particularly stable, since the individual parts are intertwined.
  • a particular advantage of the octagon filter compared to the honeycomb filter is that it is easy to install and easy to repair. All internals for the octagon filter can easily be put together on site like a puzzle.
  • an alley is defective in a hexagonal honeycomb filter, the entire alley of this filter must be closed and thus fails. If there are several defective lanes, this means that the entire filter or at least a large part of the filter must be replaced completely as a closed package.
  • the octagon filter according to the invention only the part affected in each case has to be replaced in the event of a repair; this is particularly the case with the preferred embodiments with the crossbars attached profiles noticeable. In the filter concerned, only the corresponding crossbar with the plates attached to it must be pulled out and replaced. The rest of the filter does not need to be touched.
  • Non-uniform electrostatic filters are shown in both figures, but rather three lanes in each drawing: a conventional first lane 11 consisting of only two parallel plates, an improved so-called square lane 12 made of tubes with a square cross-section and a third lane 13 according to the invention made of tubes with octagonal cross section.
  • the electrostatic filter would particularly preferably only be constructed from tubes with an octagonal cross section.
  • Spray electrodes 21 can be seen, of which only one or two are shown in each lane for the sake of clarity.
  • the walls of the respective alleys or tubes act as precipitation electrodes 22.
  • Electrical fields 23 form between the spray electrodes 21 and the precipitation electrodes 22, the line course of which is indicated.
  • electrostatic filters in particular made of lead, has support beams, of which the support beams 31, 32, 33, 34 can be seen in the example of FIGS. 1 and 2. They are parallel and evenly spaced from each other and run across the entire width of the electrostatic filter. The figures here only show a section. These support beams 31 to 34 carry most of the walls, namely plates 36, 37, 38 and 39. These plates are made of lead or steel with a lead jacket. Since the aggressive and corrosive components of the gas or fluid to be filtered are to be deposited on them, they must be resistant to these components. The high weight of the plates 36 to 39 necessitates a corresponding stability of the support beams 31 to 34. This stability is difficult to achieve in the case of support beams running in a zigzag pattern or respectively pivoted through 120 °.
  • the support beams 31 to 34 each belong to the different embodiments of the filter.
  • the plates 36 to 39 are also used when the entire electrostatic filter consists of tubes 8 with an octagonal cross section.
  • the spray electrodes 21 are the only one in the alley 11 between the two plates 36 and 37 (cf. FIG. 2), in the square alley 12 additional cross elements 41a, 41b and 41c are used between the two supports 32 and 33.
  • These cross elements 41 each have a cross beam 42 which is supported on the support beams 32 and 33 and extends perpendicular to them.
  • Plate-shaped profiles 43 hang on the crossbeams 42.
  • These plate-shaped profiles 43 together with the plates 37 and 38 each form the tubes 4a, 4b and 4c with a square cross-section.
  • the plate-shaped profiles 43 consist of the material of the plates 36 to 39 and are correspondingly heavy.
  • the crossbars 42 must therefore also be stable. The weight of these crossbeams 42 with the plate-shaped profiles 43 hanging on them must be absorbed and carried by the support beams 32 and 33.
  • the third alley 13 with the tubes 8a, 8b and 8c with the octagonal cross section is formed between the plates 38 and 39 on the support beams 33 and 34.
  • the transverse elements 81a, 81b and 81c are located between these support beams 33 and 34.
  • These cross elements each have a cross bar 82, which is supported on the support beams 33 and 34 and are fastened to the profiles 83.
  • These profiles 83 also consist of the material of the plates 38 and 39. However, they are not in the form of a clean plate, but instead they consist of a special profile, which is particularly evident from FIGS. 3 and 4.
  • FIG. 4 shows the cross section of these profiles. They consist of a Y with a vertical base mirrored at its base 85.
  • the Y each has a foot 86a or mirrored 86b and two arms 87a and 87b or 87c and 87d. There is an angle of 90 ° between the arms and therefore an angle of 135 ° between each arm and one foot.
  • the foot 86a of the Y forms a straight line with its mirror image 86b.
  • Arms 87 are all the same length; the middle part consisting of the foot 86a and its mirror image 86b has the same length between the branching points of the arms.
  • 83 flange projections 84 are attached to the front ends of the profile. These correspond to the profile on the end face and increase the strength and stability of the transverse elements 81.
  • the transverse beam 82 adjoins the flange projections.
  • the entire cross element 81 is supported and supported with its cross beam 82 on the two support beams 33 and 34.
  • Two mutually adjacent transverse elements 81 are arranged at such a distance that a tube 8 with an octagonal cross section is formed between them, taking into account the plates 38 and 39.
  • the eight sides of the octagon are formed clockwise by the arm 87a, the foot 86 and the arm 87c of the second cross element 81d, the plate 39 on the support beam 34, the arm 87d, the foot 86 and the arm 87b of the first cross element 81a and the Plate 38 on the beam 33. All these eight pages are of equal length.
  • the wall sides 80a, 80b, 80c, 80d, 80e, 80f, 80g and 80h are created.
  • 5 to 7 show another embodiment for an electrostatic filter according to the invention.
  • 5 shows the essential elements in an oblique plan view a tube 8d with sections of adjacent tubes.
  • the support beam 33 and the support beam 34 are indicated schematically.
  • the plates 38 and 39 which form the longitudinal walls and pass through several tubes 8d etc., hang on this support beam.
  • Between the support beams 33 and 34 are transverse beams 82, the upper edge of which is flush with the upper edge of the support beams 33 and 34 and which each bridge the entire distance between the two adjacent support beams.
  • Wall plates 95 are formed in one piece with the crossbars 82. These are thus perpendicular to the plates 38 and 39.
  • FIG. 7 shows the shape of the crossbars 82 with the wall plates 95 more clearly.
  • profiles 91 and 94 are welded to the plates 38 and 39, which form an angle 92 with two legs 93.
  • the ends of the legs that go vertically are welded to the plates 38 and 39.
  • the angle 92 is approximately 90 °.
  • the legs 93 thus enclose an angle of 45 ° with the plates 38 and 39.
  • the two profiles 91 and 94 are welded and arranged opposite one another and symmetrically projecting from one another by the two plates 38 and 39.
  • the wall plates 95 which are fastened to the crossbeams 82, can then be suspended exactly between the vertices at the angles 92 of the profiles 91 and 94.
  • vertically continuous grooves 96 are provided on the outer sides of the profiles 91 and 94, respectively.
  • the wall plate 95 can be inserted into this from above.
  • the crossbars 82 are then supported on the top of the profiles 91 and 94 and protrude above them.
  • For stabilization entanglement elements 97 can also be provided there.
  • the tube 8d is formed with an octagonal cross section.
  • the eight sides are formed in each case by sections of the plates 38 and 39, by the wall plates 95 which hang from two adjacent cross beams 82 or are formed in one piece therewith and each by four legs 93 of four different profiles 91 and 94; two each, which are assigned to a crossbar 82.
  • the legs which are not required in each case for delimiting the octagonal tube 8d are used for delimiting different neighboring tubes in each case.

Claims (9)

  1. Electrofiltre en plastique et/ou métal, en particulier en plomb, ayant la forme d'un filtre tubulaire comportant des tubes (8) avec des axes parallèles entre eux et possédant une section droite polygonale, ainsi que des électrodes d'émission (21) orientées axialement dans chaque tube, électrofiltre dans lequel les parois des tubes agissent comme des électrodes de dépôt et les parois directement juxtaposées de tubes voisins sont chaque fois alignées, et dans lequel est prévue une rangée de poutres/supports orientées parallèlement et uniformément espacées, qui s'étendent sur toute la largeur de l'électrofiltre et portent les parois, caractérisé en ce que les parois (80) forment des tubes (8) ayant une section droite octogonale.
  2. Electrofiltre selon la revendication 1, caractérisé en ce que la section droite des tubes (8) est un octogone régulier.
  3. Electrofiltre selon la revendication 1 ou 2, caractérisé en ce que, perpendiculairement à la rangée de poutres/supports (31, 32, 33, 34), on a prévu des poutres transversales (82) auxquelles sont fixés des profilés (83) qui forment les parois (80) des tubes (8a) qui ne sont pas orientées parallèlement aux poutres/supports (31, 32, 33, 34).
  4. Electrofiltre selon la revendication 3, caractérisé en ce que les poutres transversales (82) sont pourvues de saillies semblables à des ailerons (84) dirigés vers les tubes (8) et qui suivent la forme d'extrémité des profilés-parois de tubes (83).
  5. Electrofiltre selon la revendication 3 ou 4, caractérisé en ce que les profilés (83) forment, en section droite, deux Y symétriques à pied vertical (86) qui se joignent par les bases (85) de leurs pieds.
  6. Electrofiltre selon la revendication 5, caractérisé en ce que les branches (87) de l'Y renferment chacune un angle de 135° avec le pied (86).
  7. Electrofiltre selon une des revendications précédentes, caractérisé en ce que des profilés (91) orientés verticalement sont fixés aux parois (80) des tubes (8) orientées parallèlement aux poutres/supports (31, 32, 33, 34), profilés (91) qui forment un angle (92) délimité par deux côtés (93) fixés à la paroi (80), tandis que le sommet est dirigé vers la paroi voisine, qu'un profilé (94) correspondant est disposé symétriquement sur la paroi voisine et qu'une plaque-cloison (95) est insérée, perpendiculairement aux parois (80) parallèles aux poutres/supports, entre les sommets de deux profilés (91, 94) situés l'un en face de l'autre.
  8. Electrofiltre selon la revendication 7, caractérisé en ce que l'angle (92) enfermé par les deux côtés (93) est d'environ 90°.
  9. Electrofiltre selon les revendications 3 et 7 ou 8, caractérisé en ce que les poutres transversales (82) s'étendent sur toute la distance entre deux poutres-supports (31, 32, 33, 34) parallèles voisines et font donc saillie par-dessus les profilés (91, 94), tandis que les plaques-cloisons (95) sont fixées aux poutres transversales (82).
EP89119212A 1989-01-11 1989-10-17 Electrofiltre en plastique et/ou en métal, en particulier en plomb Expired - Lifetime EP0377794B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI895798A FI895798A0 (fi) 1989-01-11 1989-12-04 Elektriskt filter av plast och/eller metall, speciellt av bly.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3900552 1989-01-11
DE3900552A DE3900552A1 (de) 1989-01-11 1989-01-11 Elektrofilter aus kunststoff und/oder metall, insbesondere aus blei

Publications (2)

Publication Number Publication Date
EP0377794A1 EP0377794A1 (fr) 1990-07-18
EP0377794B1 true EP0377794B1 (fr) 1993-10-06

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Application Number Title Priority Date Filing Date
EP89119212A Expired - Lifetime EP0377794B1 (fr) 1989-01-11 1989-10-17 Electrofiltre en plastique et/ou en métal, en particulier en plomb

Country Status (4)

Country Link
US (1) US5030254A (fr)
EP (1) EP0377794B1 (fr)
CA (1) CA2007256A1 (fr)
DE (2) DE3900552A1 (fr)

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DE4041909C2 (de) * 1990-12-27 1994-09-29 Petersen Hugo Verfahrenstech Elektroabscheider
DE4141934C1 (fr) * 1991-12-19 1993-02-18 Metallgesellschaft Ag, 6000 Frankfurt, De
US5733360A (en) * 1996-04-05 1998-03-31 Environmental Elements Corp. Corona discharge reactor and method of chemically activating constituents thereby
US6176977B1 (en) 1998-11-05 2001-01-23 Sharper Image Corporation Electro-kinetic air transporter-conditioner
US20030206837A1 (en) 1998-11-05 2003-11-06 Taylor Charles E. Electro-kinetic air transporter and conditioner device with enhanced maintenance features and enhanced anti-microorganism capability
US7695690B2 (en) 1998-11-05 2010-04-13 Tessera, Inc. Air treatment apparatus having multiple downstream electrodes
US20050210902A1 (en) 2004-02-18 2005-09-29 Sharper Image Corporation Electro-kinetic air transporter and/or conditioner devices with features for cleaning emitter electrodes
US7724492B2 (en) 2003-09-05 2010-05-25 Tessera, Inc. Emitter electrode having a strip shape
US7906080B1 (en) 2003-09-05 2011-03-15 Sharper Image Acquisition Llc Air treatment apparatus having a liquid holder and a bipolar ionization device
US7767169B2 (en) 2003-12-11 2010-08-03 Sharper Image Acquisition Llc Electro-kinetic air transporter-conditioner system and method to oxidize volatile organic compounds
US20060018809A1 (en) 2004-07-23 2006-01-26 Sharper Image Corporation Air conditioner device with removable driver electrodes
US7833322B2 (en) 2006-02-28 2010-11-16 Sharper Image Acquisition Llc Air treatment apparatus having a voltage control device responsive to current sensing
CN101745465B (zh) * 2008-12-19 2015-03-04 巴布科克和威尔科克斯能量产生集团公司 静电滤尘器的放电电极及其增强方法

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DE315931C (fr) *
DE677102C (de) * 1936-07-18 1940-08-01 Heinrich Zschocke Elektrischer Gasreiniger mit waagerechter oder schraeger Gasfuehrung
FR940869A (fr) * 1943-06-02 1948-12-27 Appareil pour la précipitation électrique de poussières et de brouillards
DE1001240B (de) * 1950-10-21 1957-01-24 Apra Precipitator Corp Elektrischer Entstauber fuer Gase, insbesondere Rauchgase
GB714589A (en) * 1951-04-13 1954-09-01 Dieter Otto Heinrich Improvements relating to electrostatic precipitators
US2853150A (en) * 1955-06-03 1958-09-23 Research Corp Collecting electrode structure
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DE2641114C3 (de) * 1976-09-13 1981-05-14 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zur Herstellung eines Kunststoff-Elektrofilters in Wabenform
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DE3415984A1 (de) * 1984-04-28 1985-11-07 Hugo Petersen Gesellschaft für verfahrenstechnischen Anlagenbau mbH & Co KG, 6200 Wiesbaden Elektrofilter

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Publication number Publication date
DE3900552A1 (de) 1990-07-12
EP0377794A1 (fr) 1990-07-18
DE58905840D1 (de) 1993-11-11
US5030254A (en) 1991-07-09
CA2007256A1 (fr) 1990-07-11

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