EP0332569B1 - Lichtbogenheizvorrichtung für Pfannen oder Pfannenöfen - Google Patents

Lichtbogenheizvorrichtung für Pfannen oder Pfannenöfen Download PDF

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Publication number
EP0332569B1
EP0332569B1 EP89730059A EP89730059A EP0332569B1 EP 0332569 B1 EP0332569 B1 EP 0332569B1 EP 89730059 A EP89730059 A EP 89730059A EP 89730059 A EP89730059 A EP 89730059A EP 0332569 B1 EP0332569 B1 EP 0332569B1
Authority
EP
European Patent Office
Prior art keywords
heating device
arc heating
support arm
electrodes
furnace
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
EP89730059A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0332569A1 (de
Inventor
Hugo Dipl.-Ing. Todzy
Karl-Heinz Dipl.-Ing. Mühlenbeck
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0332569A1 publication Critical patent/EP0332569A1/de
Application granted granted Critical
Publication of EP0332569B1 publication Critical patent/EP0332569B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • H05B7/11—Arrangements for conducting current to the electrode terminals

Definitions

  • the invention relates to a three-phase electric arc heating device for pans or ladle furnaces for treating and refining molten iron, in particular steel melts, with three electrodes which can be lowered by the lid, which are held by a holder fastened to a vertically movable guide column by means of a carrying device and are connected to one phase of each via current leads Three-phase network of a furnace transformer are connected.
  • the ladle furnace is an additional unit. This places increased demands on energy consumption, space requirements, the weight and handling of the ladle furnace.
  • the disadvantage of this embodiment is on the one hand the use of three electrode lifting columns and three support arms.
  • Each support arm in turn requires its own hydraulic drive system, each with its own electronic control.
  • the support arms are arranged in parallel on one level.
  • a complex coplanar balancing is required for the carrying arms which are designed to carry current here.
  • a heating device which has a support device (support) which can be moved vertically on a guide column and on which electrodes are arranged in a positionally variable manner at the head end. Except for a schematic drawing, the type of current supply is not apparent from this document.
  • FR-A-1 569 521 shows a widespread form of the support device in which the individual electrodes are arranged on independent support arms and the power tubes are guided on the side pointing away from the furnace vessel. The guidance of these flow tubes is designed depending on the arrangement of the three support arms.
  • a melting furnace which has a support arm for each electrode.
  • the power supply and discharge lines are arranged parallel to these support arms.
  • the object of the invention is to simplify the construction of an arc heating device of the generic type and to reduce the inductances and the reactance asymmetry to a minimum by constructive measures.
  • the three electrodes are attached to a common support arm. This advantageously means that two support arms and the associated guide columns, hydraulic drives and electrical controls can be dispensed with.
  • Another advantage lies in the fact that the only arm that now carries the electrodes can be designed constructively, since neither structural nor electrical influences arise from the previously required neighboring arms. In terms of weight, the electrode support arm device becomes lighter and thus exerts a positive influence on the hall construction of the steelworks with regard to the load capacity.
  • a single electrode support arm is easier to handle because only one column with a support arm can be pivoted freely.
  • the advantage here is that by using only one support arm, the function "carrying” and the function "current carrying” can be solved separately in order to then optimally match them.
  • the cross section of the support arm can be designed arbitrarily and one have box-shaped, tubular or triangular cross-section as well as mixed forms of the above-mentioned cross-sections.
  • Tubes or rails are suitable as current-carrying elements. These can be provided with cooling without hindering other elements.
  • the arrangement of the power supply can be arranged in an isosceles triangular manner in an advantageous manner.
  • the arrangement of the electrodes on the head of the support arm is carried out in such a way that the asymmetry of the reactance is minimized and at the same time is simply held with the smallest possible pitch circle of the electrodes.
  • An advantageous embodiment is the arrangement of two electrodes between the center axis of the furnace and the guide column. This arrangement makes it possible to use three electrode holders of the same design. In addition, the length of the power supply can be equalized without major additional effort.
  • Figure 1 shows the furnace 20 with the furnace center axis 11. Coaxially to the furnace, the guide column 2 is arranged, on which the support arm 1 is attached. At the head of the support arm 1, the electrodes 9 are held by means of brackets 8. Current cables (15-17) lead from the transformer 50, which is arranged in the construction 30 of the steelworks, to the current leads (5-7).
  • FIGS. 2 and 3 show the couplings 12 and 13, which releasably connect the power cables 15-17 to the transformer 50 and to the power tubes 5-7.
  • FIG. 2 shows an arrangement of the electrodes 91-93, in which an electrode 91 in the long center plane 10, which intersects the furnace center axis 11 and the column 2 in the middle and is arranged on the side of the furnace center plane 110 facing the support column 2, and the electrodes 92, 93 are arranged at the end of the head of the support arm 1, the electrodes 91-93 concentrically forming an isosceles triangle, which are arranged with respect to the furnace center axis 11.
  • the electrode 91 is arranged on the longitudinal center plane 10 leading away from the support column 2 from the furnace center plane 110.
  • the electrodes 91-93 are held on the support arm head 1 by the holders 81-83.
  • Figures 4 to 6 each show a cross section through the support arm and the power supply.
  • the support arm is rectangular, round or triangular.
  • the power supply lines are tubular.
  • the tubes are parallel to the support arm and form an isosceles triangle with the center in the area of the center of gravity of the support arm surface.
  • FIG. 7 shows the schematic of the isosceles triangular guidance of the power supply elements, consisting of the power cables 15 - 17 and the power supplies 5 - 7. From the transformer 50 to the electrode tip 9, the path that the current must travel is of the same length. The same path length is achieved in that loops 51 and 61 are provided in the transition from the power supply lines 6 and 7 to the electrodes 92, 93, which have the same length as the power supply part 71 of the power supply line 7.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Discharge Heating (AREA)
EP89730059A 1988-03-11 1989-03-06 Lichtbogenheizvorrichtung für Pfannen oder Pfannenöfen Expired - Lifetime EP0332569B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3808683 1988-03-11
DE3808683A DE3808683C1 (en, 2012) 1988-03-11 1988-03-11

Publications (2)

Publication Number Publication Date
EP0332569A1 EP0332569A1 (de) 1989-09-13
EP0332569B1 true EP0332569B1 (de) 1993-12-01

Family

ID=6349817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730059A Expired - Lifetime EP0332569B1 (de) 1988-03-11 1989-03-06 Lichtbogenheizvorrichtung für Pfannen oder Pfannenöfen

Country Status (4)

Country Link
EP (1) EP0332569B1 (en, 2012)
DE (2) DE3808683C1 (en, 2012)
ES (1) ES2047148T3 (en, 2012)
ZA (1) ZA891817B (en, 2012)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1280159B1 (it) * 1995-04-14 1998-01-05 Danieli Off Mecc Circuito secondario ad impedenza variabile per forno elettrico ad arco
RU2192713C1 (ru) * 2001-02-23 2002-11-10 Фролов Юрий Федорович Устройство для подвода электроэнергии
RU2348879C1 (ru) * 2007-05-08 2009-03-10 Государственное образовательное учреждение высшего профессионального образования Московский государственный вечерний металлургический институт Ферросплавная лазерная печь
CN106990281A (zh) * 2017-03-02 2017-07-28 中国航天空气动力技术研究院 并联三相星型交流电弧加热器电流测量装置及方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE361775C (de) * 1920-01-28 1922-10-19 Frederick Von Schlegell Einrichtung zur selbsttaetigen Regelung elektrischer Lichtboegen, insbesondere fuer elektrische OEfen
DE929864C (de) * 1942-04-03 1955-07-04 Aeg Leitungsfuehrung fuer Drehstrom-Lichtbogenoefen
US2852585A (en) * 1956-05-09 1958-09-16 Unternehmunger Der Eisen Und S Electric arc melting furnace
US3366725A (en) * 1964-12-21 1968-01-30 Watteredge Co Balancing a three-phase power transmission system for an electric arc furnace
US3395238A (en) * 1965-05-17 1968-07-30 Northwestern Steel & Wire Comp Power coupling and electrode arrangement for electric furnace
SE307996B (en, 2012) * 1965-11-30 1969-01-27 Asea Ab
GB1166148A (en) * 1967-06-06 1969-10-08 United Steel Companies Ltd Electric Arc Furnaces
GB1451200A (en) * 1973-12-06 1976-09-29 Inst Elektroswarki Patona Installation for electroslag melting
US3898707A (en) * 1974-01-14 1975-08-12 United States Steel Corp Low balanced reactance delta closure for electric arc furnace transformers
GB1508691A (en) * 1976-02-04 1978-04-26 Inst Elektroswarki Patona Electrode holder for a multielectrode furnace
DE3419681A1 (de) * 1984-05-24 1985-11-28 Mannesmann AG, 4000 Düsseldorf Gleichstrom-lichtbogen-heizvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H.Knapp et al. "Der Pfannenofen mit stromzuführenden Tragarmen",Fachberichte Hüttenpraxis Metallverarbeitung, Vol.24,Nr.10,1986,SEITEN 940-944,946 *

Also Published As

Publication number Publication date
EP0332569A1 (de) 1989-09-13
ZA891817B (en) 1990-02-28
DE58906270D1 (de) 1994-01-13
ES2047148T3 (es) 1994-02-16
DE3808683C1 (en, 2012) 1989-09-07

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