EP0077513B1 - Procédé pour empêcher l'usure d'une électrode conductrice de courant pour fours métallurgiques et électrode - Google Patents

Procédé pour empêcher l'usure d'une électrode conductrice de courant pour fours métallurgiques et électrode Download PDF

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Publication number
EP0077513B1
EP0077513B1 EP82109375A EP82109375A EP0077513B1 EP 0077513 B1 EP0077513 B1 EP 0077513B1 EP 82109375 A EP82109375 A EP 82109375A EP 82109375 A EP82109375 A EP 82109375A EP 0077513 B1 EP0077513 B1 EP 0077513B1
Authority
EP
European Patent Office
Prior art keywords
electrode
upper portion
electrode according
nipple
metal pipes
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
Application number
EP82109375A
Other languages
German (de)
English (en)
Other versions
EP0077513A1 (fr
Inventor
Emil Elsner
Josef Messmer
Dietfried Reiber
Peter Kaiser
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.)
C Conradty Nuernberg GmbH and Co KG
Original Assignee
Von Roll AG
C Conradty Nuernberg GmbH and Co KG
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 Von Roll AG, C Conradty Nuernberg GmbH and Co KG filed Critical Von Roll AG
Priority to AT82109375T priority Critical patent/ATE16070T1/de
Publication of EP0077513A1 publication Critical patent/EP0077513A1/fr
Application granted granted Critical
Publication of EP0077513B1 publication Critical patent/EP0077513B1/fr
Expired 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
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc
    • 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
    • H05B7/12—Arrangements for cooling, sealing or protecting electrodes

Definitions

  • the invention relates to a method for preventing the erosion on peripheral surfaces of a current-conducting electrode for metallurgical furnaces, which is composed of a permanent top part and an edible tip and is cooled in the top part, and a current-conducting electrode for carrying out the method.
  • the consumption of graphite electrodes is made up as follows: Of the total consumption, about 50% is the erosion of the electrode tip, about 45% of the side electrode erosion and about 5% is lost due to electrode breakage.
  • Electrodes are known in which the upper part does not consist of graphite but of a metal, for example a copper tube, which is cooled by a cooling medium, cf. e.g. B. DE-A-1 565 751 or EP-A-12 573.
  • An edible graphite tip is attached to this upper part by means of a threaded nipple made of graphite or metal.
  • the metal parts of the upper part made of metal have the disadvantage that they are subject to higher heat losses and the risk of burning when in contact with conductive parts, for. B. steel scrap.
  • the permanent upper part is made of graphite or carbon and is cooled below the burn-off temperature by a cooling medium guided inside the same.
  • an electrode is used in which the permanent upper part with two or more metal tubes extending in the longitudinal direction over the entire length of the upper part, for. B. of copper, is provided, in which the cooling medium circulates.
  • the current-conducting electrode shown in FIG. 1 is composed of three electrode parts I, II, III, of which parts 1, II form the permanent upper part and part 111 forms the consumable tip of the electrode.
  • the electrode is covered by a cover plate 1 which projects over the cross section of the electrode in order to prevent it from slipping through the electrode holder.
  • a support bracket 3 is also attached to the cover plate 1.
  • the electrode parts I, 11, 111 are screwed tightly by means of threaded nipples 4, 5 arranged in the center of the electrode cross section.
  • the threaded nipple 4 can also be made of graphite or copper, while the threaded nipple 5, as will be shown, is expediently made of copper.
  • a tongue and groove connection can be used.
  • the electrode does not have to be composed of the three parts I, 11, 111 shown in FIG. 1.
  • the upper part can either consist of only a single electrode part or of more than two electrode parts.
  • the inventive design of the electrode is explained in more detail with reference to FIGS. 2 and 3.
  • the nipple 4 is no longer completely drawn here since it remains unchanged compared to known designs.
  • a number of copper tubes 6, one of which is shown in FIG. 2, extend through the electrode parts I, II of the permanent upper part.
  • the copper tubes 6 are provided with an external thread at their ends the nuts 7 are screwed onto the upper end with a flange and nuts 9 are screwed onto the lower end.
  • an intermediate plate 10 is arranged, through which the copper tubes 6 extend and which is held by the nuts 9.
  • a recess 11 is provided at each pipe mouth, into which two conical rings 12, 13 made of soft copper are inserted and which are pressed together by the nut 9, so that a good conductive contact between the copper pipe 6 and the intermediate plate 10 is produced. Only a conical ring could also be used, but then the recess 11 would also have to be conical.
  • the copper tubes 6 with their nuts 7, 9 represent tie rods with which the electrode parts I, II are firmly clamped.
  • the permanent upper part is considerably reinforced by the copper pipes 6 on the one hand and by the pretensioning of the nuts 7, 9 on the other hand.
  • the nipple 5 is firmly screwed onto the intermediate plate 10 by means of screws 14.
  • the nipple 5 has a cylindrical portion 15 adjoining the intermediate plate 10, to which the conical thread portion 16 adjoins.
  • the intermediate plate 10 and the cylindrical portion 15 of the nipple 5 are centered by the projection and recess 17 and surrounded by a graphite ring 18. So that there is a perfect contact between the end of the copper tube 6 and the nipple section 15, a sealing ring 19, for. B. made of silver.
  • the intermediate plate 10 and the nipple 5 are suitably made of copper.
  • the consumable tip III of the electrode is firmly screwed onto the conical nipple portion 16.
  • An axial bore 20 is provided in the center of the electrode, through which gases can be fed to the arc region.
  • a cooling medium for. B. water, with which the permanent upper part is cooled to such an extent that no erosion occurs on the peripheral surface. This is the case when e.g. B. in graphite electrodes the temperature is below 600 ° C.
  • the tubes are, as can be seen from Fig. 3, in series, i. H. connected in series.
  • six copper tubes 6 are arranged, which are designated a-b-c-d-e-f in accordance with the sequence of their flow.
  • Arrow 21 shows the entry of the cooling medium into tube a.
  • Channels 22 (FIG. 2) connected to the copper tubes 6 are drilled in the nipple 5 and establish the connection to the adjacent copper tubes 6.
  • the coolant flows from the tube a through the nipple 5 and reaches the tube b through appropriate channels.
  • the pipes are connected to one another by means of pipe elbows 23, which are provided with flanges 24, onto which nuts 7 are screwed by means of screws 25.
  • the flange of nut 7 is so large that flange 24 of pipe elbows 23 is screwed on can be.
  • the cooling medium flows via the pipe bend bc into the pipe c, then via channels cd in the nipple 5 into the pipe d, from there via the pipe bend de into the pipe e, and from there via the channels ef into the pipe f and from there in the sequence indicated by arrow 26.
  • the advantage of connecting the copper tubes 6 in series is that only one inlet and one outlet are required for the cooling medium. However, it would also be possible to connect the copper tubes 6 partly in series and partly in parallel or completely in parallel.
  • the previously used electrode holder can be used, so that no structural changes are necessary. A smooth flow of electricity is ensured; as usual, this passes from the jaws of the electrode holder 2 to the graphite in the electrode part 1.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Contacts (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Resistance Heating (AREA)

Claims (12)

1. Procédé pour empêcher l'usure des surfaces périphériques d'une électrode conductrice de courant pour fours métallurgiques qui se compose d'une partie supérieure (f, II) permanente et d'une pointe (III) consommable et qui est refroidie dans sa partie supérieure, caractérisé en ce que la partie supérieure permanente est réalisée en graphite ou en charbon et est refroidie au-dessous de la température d'usure par un milieu réfrigérant qui circule à l'intérieur de cette partie.
2. Procédé selon la revendication 1, caractérisé en ce que le milieu réfrigérant, par exemple l'eau, est soumis à une circulation forcée.
3. Electrode pour l'application du procédé selon la revendication 1, caractérisée en ce qu'elle comporte une partie supérieure (I, II) permanente et une pointe (III) consommable, la partie supérieure (I, II) permanente étant en graphite ou en charbon et comportant deux ou plus de deux tubes (6) en métal, par exemple en cuivre, qui s'étendent dans le sens longitudinal sur toute la longueur de la partie supérieure et dans lesquels le milieu réfrigérant circule.
4. Electrode selon la revendication 3, caractérisée en ce que la partie supérieure (I, II) comporte à son extrémité supérieure une plaque de couverture (1) et, à son extrémité inférieure, une plaque intermédiaire (10), les tubes en métal (6) traversant ces plaques et serrant et renforçant la partie supérieure par l'intermédiaire de dispositifs de serrage, par exemple d'écrous à brides (7) et d'écrous (9) montés sur les extrémités des tubes.
5. Electrode selon la revendication 4, caractérisée en ce qu'à la plaque intermédiaire (10) un raccord fileté (5) permettant le vissage de la pointe (III) consommable est fixé par exemple par des boulons filetés (14) dans lesquels sont ménagés des conduits (22)'qui se raccordent aux extrémités des tubes métalliques (6) qui débouchent dans la plaque intermédiaire (10).
6. Electrode selon la revendication 5, caractérisée en ce qu'entre le raccord fileté (5) et les extrémités des tubes métalliques (6) elle comporte des joints (19) constitués par des métaux bons conducteurs.
7. Electrode selon la revendication 4, caractérisée en ce qu'entre la plaque intermédiaire (10) et les extrémités des tubes métalliques (6) elle comporte des bagues de joint (12, 13), par exemple des éléments de serrage annulaires, en métal bon conducteur.
8. Electrode selon l'une des revendications 6 ou 7, caractérisée en ce que les bagues de joint (12, 13) et le joint (19) sont en cuivre mou ou en argent.
9. Electrode selon la revendication 4, caractérisée en ce que la plaque intermédiaire (10) et le raccord fileté (5) sont constitués par un matériau bon conducteur, par exemple par du cuivre.
10. Electrode selon la revendication 4, caractérisée en ce que les dispositifs de serrage (7, 9) des tubes métalliques (6) servent à serrer une partie supérieure (I, II) constituée par deux ou plus de deux pièces partielles.
11. Electrode selon la revendication 3, caractérisée en ce que les tubes métalliques (6) sont montés en série et reliés par des conduits de liaison (22, 23) ménagés dans la plaque de couverture (1) et le raccord fileté (5).
12. Electrode selon la revendication 11, caractérisée en ce que les conduits de liaison du côté supérieur de la plaque de couverture (1) sont des tubes coudés (23).
EP82109375A 1981-10-15 1982-10-09 Procédé pour empêcher l'usure d'une électrode conductrice de courant pour fours métallurgiques et électrode Expired EP0077513B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82109375T ATE16070T1 (de) 1981-10-15 1982-10-09 Verfahren zur verhinderung des abbrands an einer stromleitenden elektrode fuer metallurgische oefen und elektrode.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH660581 1981-10-15
CH6605/81 1981-10-15

Publications (2)

Publication Number Publication Date
EP0077513A1 EP0077513A1 (fr) 1983-04-27
EP0077513B1 true EP0077513B1 (fr) 1985-10-09

Family

ID=4312194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109375A Expired EP0077513B1 (fr) 1981-10-15 1982-10-09 Procédé pour empêcher l'usure d'une électrode conductrice de courant pour fours métallurgiques et électrode

Country Status (11)

Country Link
US (1) US4498185A (fr)
EP (1) EP0077513B1 (fr)
JP (1) JPS5875791A (fr)
AT (1) ATE16070T1 (fr)
BR (1) BR8206010A (fr)
CA (1) CA1204807A (fr)
DD (1) DD203805A5 (fr)
DE (1) DE3266857D1 (fr)
DK (1) DK456482A (fr)
ES (1) ES8401140A1 (fr)
ZA (1) ZA826996B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4513425A (en) * 1983-07-15 1985-04-23 Great Lakes Carbon Corporation Composite electrode for arc furnace
US4490824A (en) * 1983-07-15 1984-12-25 Great Lakes Carbon Corporation Composite electrode for arc furnace
US4853942A (en) * 1986-08-05 1989-08-01 Hylsa, S.A. De C.V. Graphite electrode with internal cooling for electric arc furnaces
FI123373B (fi) * 2008-06-06 2013-03-15 Outotec Oyj Tiivistyslaite

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE313852C (fr) *
DE218054C (fr) *
SE337435B (fr) * 1965-07-13 1971-08-09 J Oestberg
US3392227A (en) * 1965-07-13 1968-07-09 Jan Erik Ostberg Electrode for arc furnaces
DE2725537A1 (de) * 1977-06-06 1978-12-14 Korf Stahl Elektrode fuer lichtbogenoefen
DE2845367C2 (de) * 1978-10-18 1981-01-22 Korf & Fuchs Syst Tech FlUssigkeitsgekühlte Halterung für die Spitze einer Elektrode eines Lichtbogenschmelzofens
US4287381A (en) * 1978-12-19 1981-09-01 British Steel Corporation Electric arc furnace electrodes

Also Published As

Publication number Publication date
DE3266857D1 (en) 1985-11-14
CA1204807A (fr) 1986-05-20
ES516265A0 (es) 1983-12-01
DD203805A5 (de) 1983-11-02
JPS5875791A (ja) 1983-05-07
ZA826996B (en) 1983-07-27
DK456482A (da) 1983-04-16
US4498185A (en) 1985-02-05
BR8206010A (pt) 1983-09-13
EP0077513A1 (fr) 1983-04-27
ES8401140A1 (es) 1983-12-01
ATE16070T1 (de) 1985-10-15

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