EP0422406B1 - Anode pour un four à arc à courant continu - Google Patents

Anode pour un four à arc à courant continu Download PDF

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Publication number
EP0422406B1
EP0422406B1 EP90117707A EP90117707A EP0422406B1 EP 0422406 B1 EP0422406 B1 EP 0422406B1 EP 90117707 A EP90117707 A EP 90117707A EP 90117707 A EP90117707 A EP 90117707A EP 0422406 B1 EP0422406 B1 EP 0422406B1
Authority
EP
European Patent Office
Prior art keywords
anode according
bricks
furnace
copper ring
layer made
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
EP90117707A
Other languages
German (de)
English (en)
Other versions
EP0422406A2 (fr
EP0422406A3 (en
Inventor
Dane Meredith
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.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
Deutsche Voest Alpine Industrieanlagenbau 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 Voest Alpine Industrienlagenbau GmbH, Deutsche Voest Alpine Industrieanlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Priority to AT90117707T priority Critical patent/ATE100662T1/de
Publication of EP0422406A2 publication Critical patent/EP0422406A2/fr
Publication of EP0422406A3 publication Critical patent/EP0422406A3/de
Application granted granted Critical
Publication of EP0422406B1 publication Critical patent/EP0422406B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/06—Electrodes

Definitions

  • the invention relates to an anode according to the preamble of claim 1.
  • GB-A-2 072 470 describes a ladle furnace with arc heating, in which an anode is designed as a quasi-annular current conductor in the form of individual contacts around the ladle. These individual contacts are only connected to a part of the electrically conductive ff-lining that only extends into a small edge area of the container bottom. Due to the small wall and floor areas, which are provided with an electrically conductive lining, there are also only small current-carrying cross sections. Depending on the construction and the material used, the maximum possible arc current is limited by the permissible current density in the refractory material.
  • WO-A-89/11774 discloses a low-wear electrode for direct current arc furnaces, which is said to have an asymmetrical configuration of the electrode over the circumference.
  • EP 0 258 101 A1 discloses the use of a steel stick projecting into the melt as the bottom electrode.
  • the effect of the arc pointing only downward occurs even more, so that the arc cone becomes even more pointed and cold zones also occur adjacent to the furnace wall.
  • This electrode also requires water cooling, which is located below the molten metal. This is problematic for security reasons.
  • a DC arc furnace is known from US Pat. No. 4,853,941, in which between a bottom electrode and the melt a uniform layer of refractory, electrically conductive stones is arranged.
  • the stones are made of magnesite-graphite material that has undergone heat treatment to increase its electrical conductivity. Since the electrically conductive lining and the electrode are only arranged in the bottom area, cold zones on the furnace wall cannot be avoided either. In addition, the cooling conditions are unfavorable, so that the electrode is water-cooled.
  • a copper ring is preferably used as the current conductor, which is fastened to the inside of the steel jacket in the lower wall area of the furnace. This gives a large-area contact between the electrically conductive lining and the current conductor. This training also enables effective air cooling of the conductor.
  • cathode 1 In the middle of the furnace there is a vertically extending and adjustable in this direction cathode 1. Between this and the surface of a molten metal 2, an electric current flows in the form of an arc. This generates enough heat to melt and keep molten metal that has been put into the furnace.
  • the furnace has a steel jacket made of a lower part 3 and a cylindrical upper part 4.
  • Lower part 3 and upper part 4 are mechanically by flanges 5 and 6 via an electrical insulating intermediate layer 7 bonded together.
  • the lining of the furnace contains a layer of electrically conductive, wear and fire-resistant stones 8, which is in contact with the molten metal 2.
  • the unevenness of the surface of this layer facing the molten metal resulting from the shape of the stones 8 is compensated for by an electrically conductive ramming compound 9.
  • the layer of stones 8 extends over most of the bottom area of the furnace.
  • the outer layer of the lining consists of stones 10 made of electrically insulating, refractory material in the floor area. Between the insulating layer of stones 10 in the floor area and the electrically conductive layer of stones 8 there is a layer of stones 11 which have a higher electrical conductivity than stones 8 but do not have their high wear and fire resistance.
  • Graphite stones are preferably used as stones 11. The thickness of the layer of stones 11 increases towards the outer edge. This layer is shown continuously in the figure; however, it can also be omitted in the middle floor area.
  • the graphite stones should be arranged so that their pressing direction coincides with the radial direction of the furnace, whereby the electrical resistance of the layer they form is minimized in the radial direction.
  • a copper ring 12 is plated out of the stones 11 or connected to it in some other way.
  • the copper ring 12 can be continuous or can be divided into several segments in its circumferential direction. Copper conductors 13 are guided through the lower part 3 and connected to the copper ring 12 for carrying current.
  • the lining is formed by a continuous layer of the refractory, electrically insulating stones 10.
  • the bottom and the lower wall area of the furnace are provided with means for guiding a cooling medium, preferably air.
  • the cooling medium is brought under the center of the base and brought radially outwards in a cavity delimited by a base plate 14 under the base and by a deflection to the wall area at the height of the copper ring 12.
  • Cooling fins 15 projecting radially outward from the lower part 3 and projecting into the cavity serve to increase the cooling effect and to guide the cooling medium.
  • the copper ring 12 For a furnace with a capacity of 60 t and a diameter of approx. 5.2 m and a maximum current of 85 000 A, the copper ring 12 has, for example, a height of 400-700 mm and a thickness of 20-60 mm.
  • the copper ring can also be attached to the steel skeleton instead of the steel jacket.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)

Claims (13)

  1. Anode de four à arc à courant continu, dont au moins une partie de la zone du four qui reçoit les produits de fusion est pourvue, sur sa face interne, d'une maçonnerie (8, 9, 11), conductrice du courant électrique et réfractaire, qui est en contact électrique avec un conducteur (12) se trouvant sur la face externe, le conducteur électrique (12), conformé en forme de cylindre, étant enroulé autour de la maçonnerie (8, 9, 11) réalisée en plusieurs couches, caractérisée en ce que la face interne de la maçonnerie est constituée par une couche de pierres (8) conductrices du courant électrique, résistantes à l'usure et réfractaires, et par une couche de pierres (11) avec une conductibilité électrique plus élevée et une résistance moindre à l'usure et au feu, et en ce que l'épaisseur de la couche de pierres (11) à conductibitité plus élevée augmente suivant une direction radiale en direction du conducteur électrique (12).
  2. Anode selon la revendication 1 caractérisée en ce que le conducteur électrique est un anneau en cuivre (12), fixé sur la face interne de la chemise en acier (3), dans la zone inférieure de la paroi du four.
  3. Anode selon la revendication 1, caractérisée en ce que le conducteur électrique est un anneau en cuivre (12) qui est fixé sur une structure en acier qui soutient le four.
  4. Anode selon l'une des revendications 2 ou 3, caractérisée en ce que l'anneau en cuivre (12) est conformé de manière continue.
  5. Anode selon l'une des revendications 2 ou 3, caractérisée en ce que l'anneau en cuivre (12) est divisé en au moins deux segments suivant la direction de la circonférence.
  6. Anode selon l'une des revendications 2 ou 3, caractérisée en ce que l'anneau en cuivre (12) est relié à un ou plusieurs conducteurs (13) en cuivre répartis sur sa circonférence extérieure.
  7. Anode selon la revendication 1, caractérisée en ce que sur sa face interne, la maçonnerie comprend la couche en pierres (8) conductrices du courant électrique, résistantes à l'usure et réfractaires et en ce que, entre celle-ci et le conducteur électrique (12) la maçonnerie comporte la couche en pierres (11) à conductibilité électrique plus élevée et de résistance moindre à l'usure et au feu.
  8. Anode selon la revendication 7, caractérisée en ce que les pierres (11) à conductibilité électrique plus élevée sont des pierres en graphite.
  9. Anode selon la revendication 1, caractérisée en ce que l'épaisseur de la couche de pierres (11) à conductibilité plus élevée, au droit du passage vers le conducteur électrique de forme cylindrique (12), correspond à la hauteur dudit conducteur.
  10. Anode selon la revendication 7, caractérisée en ce que la maçonnerie comprend, sous les couches de pierres (8, 11) conductrices du courant électrique, une couche de pierres (10) réfractaires et isolantes électriquement.
  11. Anode selon l'une des revendications 2 ou 3, caractérisée en ce qu'il est prévu un dispositif (14, 15) pour amener un moyen de refroidissement vers le côté externe de l'anneau en cuivre (12).
  12. Anode selon la revendication 11, caractérisée en ce que le dispositif (14) pour la circulation du moyen de refroidissement est situé à la partie inférieure du four.
  13. Anode selon la revendication 11, caractérisée en ce que des nervures (15) faisant saillie vers l'extérieur, reliées avec l'anneau en cuivre (12) pour la conductivité de la chaleur, sont prévues pour le refroidissement et pour l'arrivée du moyen de refroidissement.
EP90117707A 1989-10-12 1990-09-14 Anode pour un four à arc à courant continu Expired - Lifetime EP0422406B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90117707T ATE100662T1 (de) 1989-10-12 1990-09-14 Anode fuer einen gleichstromlichtbogenofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/420,290 US5052018A (en) 1989-10-12 1989-10-12 Anode for a direct current arc furnace
US420290 1989-10-12

Publications (3)

Publication Number Publication Date
EP0422406A2 EP0422406A2 (fr) 1991-04-17
EP0422406A3 EP0422406A3 (en) 1991-06-26
EP0422406B1 true EP0422406B1 (fr) 1994-01-19

Family

ID=23665876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90117707A Expired - Lifetime EP0422406B1 (fr) 1989-10-12 1990-09-14 Anode pour un four à arc à courant continu

Country Status (8)

Country Link
US (1) US5052018A (fr)
EP (1) EP0422406B1 (fr)
AT (1) ATE100662T1 (fr)
CA (1) CA2027479C (fr)
DE (1) DE59004311D1 (fr)
ES (1) ES2048384T3 (fr)
TR (1) TR25858A (fr)
ZA (1) ZA907468B (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4022720A1 (de) * 1990-07-17 1992-01-23 Flohe Gmbh & Co Untergefaess eines gleichstromlichtbogenofens
DE59002344D1 (de) * 1990-09-03 1993-09-16 Asea Brown Boveri Gleichstrom-lichtbogenofen.
US5199043A (en) * 1991-08-09 1993-03-30 Deutsche Voest-Alpine Industrieanlagenbau Gmbh Lining for a direct-current electric arc furnace
DE4126627C2 (de) * 1991-08-12 1994-11-24 Voest Alpine Ind Anlagen Anode für einen Gleichstrom-Lichtbogenofen
DE4129756C2 (de) * 1991-09-04 1995-06-29 Mannesmann Ag Metallurgisches Gefäß für eine Gleichstromlichtbogeneinrichtung
DE4130397A1 (de) * 1991-09-12 1993-03-18 Kortec Ag Gleichstromofen mit einer herdelektrode, herdelektrode und elektrodenblock sowie betriebsverfahren fuer diesen ofen
US5867523A (en) * 1996-05-28 1999-02-02 Hatch Associates Ltd. Electric furnace with conductive hearth
US6331068B1 (en) 1999-02-18 2001-12-18 Lacks Industries, Inc. Flexible lamp mounting
DE19925554A1 (de) * 1999-06-04 2000-12-07 Sms Demag Ag Bodenelektrode für metallurgische Schmelzgefäße
DE19925599A1 (de) * 1999-06-04 2000-12-07 Sms Demag Ag Verfahren und Vorrichtung zum Betrieb von Lichtbogenschmelzöfen und/oder Widerstandsschmelzöfen
CN110608617B (zh) * 2019-10-22 2024-05-14 中冶赛迪工程技术股份有限公司 一种直流电弧炉的底电极

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR888149A (fr) * 1942-07-17 1943-12-03 Alais & Froges & Camarque Cie Four à arc universel
SE415394B (sv) * 1978-12-29 1980-09-29 Asea Ab Bottenkontakt vid likstromsljusbagsugn
SE423275B (sv) * 1979-06-26 1982-04-26 Asea Ab Bottenkontakt vid likstromsljusbagsugn
SE435548B (sv) * 1980-03-10 1984-10-01 Asea Ab Anordning vid skenkar eller skenkugnar for likstrom med minst en ljusbagselektrod
FR2527756B1 (fr) * 1982-06-01 1987-05-22 Siderurgie Fse Inst Rech Procede de fusion metallurgique et four a arc pour sa mise en oeuvre
DE3413745C2 (de) * 1983-04-21 1994-03-03 Asea Ab Gleichstromlichtbogenofen
SE449132B (sv) * 1984-01-25 1987-04-06 Asea Ab Likstromsljusbagsugn eller skenk for vermning
SE450857B (sv) * 1985-02-21 1987-08-03 Asea Ab Forfarande for uppbyggnad av ljusbagslikstromsugnar eller -skenkar
FR2602320B1 (fr) * 1986-08-01 1989-12-29 Clecim Sa Procede de fusion de ferraille et four electrique pour la mise en oeuvre du procede
DE3817381A1 (de) * 1988-05-18 1989-11-30 Mannesmann Ag Verschleissarme elektrode in gleichstromlichtbogenofen

Also Published As

Publication number Publication date
DE59004311D1 (de) 1994-03-03
CA2027479C (fr) 1994-08-16
CA2027479A1 (fr) 1991-04-13
TR25858A (tr) 1993-09-01
ZA907468B (en) 1991-06-26
US5052018A (en) 1991-09-24
ATE100662T1 (de) 1994-02-15
EP0422406A2 (fr) 1991-04-17
ES2048384T3 (es) 1994-03-16
EP0422406A3 (en) 1991-06-26

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