EP0422406A2 - 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
EP0422406A2
EP0422406A2 EP90117707A EP90117707A EP0422406A2 EP 0422406 A2 EP0422406 A2 EP 0422406A2 EP 90117707 A EP90117707 A EP 90117707A EP 90117707 A EP90117707 A EP 90117707A EP 0422406 A2 EP0422406 A2 EP 0422406A2
Authority
EP
European Patent Office
Prior art keywords
stones
anode according
furnace
copper ring
layer
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.)
Granted
Application number
EP90117707A
Other languages
German (de)
English (en)
Other versions
EP0422406B1 (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.
  • a direct current arc furnace with ground contact is known in which the arc lining of the furnace contains a ramming mass with electrically conductive metal parts or stones with sheet metal inserts on its contact surface with the melt. This is followed by a first layer of electrically conductive stones, a second layer of insulating stones with sheet metal layers or electrically conductive intermediate stones, and finally a third layer of electrically conductive stones connected to connecting contacts.
  • This feed is dome-shaped or flat, and is only in contact with the melt in the bottom area.
  • 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.
  • the connection is to create a structure that is simple, ensures a uniform temperature distribution in the melting material and also does not cause uneven wear of the refractory lining. Furthermore, the need for water cooling should be avoided.
  • 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 provides a large-area contact between the electrically conductive lining and the current conductor. This training also enables effective air cooling of the conductor.
  • This shows a schematic sectional view of a DC arc furnace.
  • 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 connected to each other.
  • 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. Electrically conductive, wear-resistant and fire-resistant materials for producing the stones 8 are known, for example carbon-magnesite stones.
  • the outer layer of the lining consists of stones 10 made of electrically insulating, refractory material in the floor area.
  • a layer of stones 11 which have a higher electrical conductivity than the 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 bricks should be arranged so that their pressing direction coincides with the radial direction of the furnace, thereby minimizing the electrical resistance of the layer they form in the radial direction.
  • On the inside of the cylindrical section of the lower part 3 is on the layer 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 current conduction.
  • 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 a height of 400-700 mm and a thickness of 20-60 mm, for example.
  • the copper ring can also be attached to the steel skeleton instead of the steel jacket.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
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
US420290 1989-10-12
US07/420,290 US5052018A (en) 1989-10-12 1989-10-12 Anode for a direct current arc furnace

Publications (3)

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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126627A1 (de) * 1991-08-12 1993-02-18 Voest Alpine Ind Anlagen Anode fuer einen gleichstrom-lichtbogenofen
EP0530534A1 (fr) * 1991-08-09 1993-03-10 Deutsche Voest-Alpine Industrieanlagenbau Gmbh Chemise de four pour un four à arc à courant continu
WO1993005626A1 (fr) * 1991-09-12 1993-03-18 Kortec Ag Four a courant continu pourvu d'une electrode de creuset, electrode de creuset et bloc electrode, et procede d'exploitation d'un tel four
EP0530932A3 (en) * 1991-09-04 1994-06-29 Mannesmann Ag Metallurgical container for a dc arc installation
WO2000076275A1 (fr) * 1999-06-04 2000-12-14 Sms Demag Aktiengesellschaft Recipients de fusion dotes d'une electrode de masse refroidie
US6331068B1 (en) 1999-02-18 2001-12-18 Lacks Industries, Inc. Flexible lamp mounting

Families Citing this family (5)

* 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
ES2044352T3 (es) * 1990-09-03 1994-01-01 Asea Brown Boveri Horno de arco electrico de corriente continua.
US5867523A (en) * 1996-05-28 1999-02-02 Hatch Associates Ltd. Electric furnace with conductive hearth
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

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0530534A1 (fr) * 1991-08-09 1993-03-10 Deutsche Voest-Alpine Industrieanlagenbau Gmbh Chemise de four pour un four à arc à courant continu
AU656395B2 (en) * 1991-08-09 1995-02-02 Voest-Alpine Industrieanlagenbau Gmbh Lining for a direct-current electric arc furnace
TR26545A (tr) * 1991-08-09 1995-03-15 Voest Alpine Ind Anlagen Dogru akimli bir elektrik arki firini icin ic kaplama.
DE4126627A1 (de) * 1991-08-12 1993-02-18 Voest Alpine Ind Anlagen Anode fuer einen gleichstrom-lichtbogenofen
EP0540832A1 (fr) * 1991-08-12 1993-05-12 Deutsche Voest-Alpine Industrieanlagenbau Gmbh Anode pour un four à arc à courant continu
TR26655A (tr) * 1991-08-12 1995-03-15 Voest Alpine Ind Anlagen Bir dogru akimli ark firinina mahsus anod
EP0530932A3 (en) * 1991-09-04 1994-06-29 Mannesmann Ag Metallurgical container for a dc arc installation
WO1993005626A1 (fr) * 1991-09-12 1993-03-18 Kortec Ag Four a courant continu pourvu d'une electrode de creuset, electrode de creuset et bloc electrode, et procede d'exploitation d'un tel four
US5371759A (en) * 1991-09-12 1994-12-06 Kortec Ag D.C. furnace with a hearth electrode, hearth electrode and electrode block, as well as process for operating said furnace
US6331068B1 (en) 1999-02-18 2001-12-18 Lacks Industries, Inc. Flexible lamp mounting
WO2000076275A1 (fr) * 1999-06-04 2000-12-14 Sms Demag Aktiengesellschaft Recipients de fusion dotes d'une electrode de masse refroidie
US6728291B1 (en) 1999-06-04 2004-04-27 Sms Demag Ag Melting vessels provided with a cooled bottom electrode

Also Published As

Publication number Publication date
DE59004311D1 (de) 1994-03-03
TR25858A (tr) 1993-09-01
ATE100662T1 (de) 1994-02-15
CA2027479A1 (fr) 1991-04-13
EP0422406B1 (fr) 1994-01-19
ES2048384T3 (es) 1994-03-16
EP0422406A3 (en) 1991-06-26
ZA907468B (en) 1991-06-26
CA2027479C (fr) 1994-08-16
US5052018A (en) 1991-09-24

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