EP0031482B1 - Contact electrode for fusion and heating furnaces with direct current plasma heating - Google Patents

Contact electrode for fusion and heating furnaces with direct current plasma heating Download PDF

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Publication number
EP0031482B1
EP0031482B1 EP80107583A EP80107583A EP0031482B1 EP 0031482 B1 EP0031482 B1 EP 0031482B1 EP 80107583 A EP80107583 A EP 80107583A EP 80107583 A EP80107583 A EP 80107583A EP 0031482 B1 EP0031482 B1 EP 0031482B1
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EP
European Patent Office
Prior art keywords
contact electrode
heating
face
direct current
current plasma
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
EP80107583A
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German (de)
French (fr)
Other versions
EP0031482A1 (en
Inventor
Herbert Pietzsch
Walter Dipl.Jur Lachner
Karlheinz Hofmann
Erich Pötzsch
Fred Dr. Ing. Esser
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.)
Edelstahlwerk 8 Mai 1945 Freital VEB
Original Assignee
Edelstahlwerk 8 Mai 1945 Freital VEB
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Filing date
Publication date
Application filed by Edelstahlwerk 8 Mai 1945 Freital VEB filed Critical Edelstahlwerk 8 Mai 1945 Freital VEB
Priority to AT80107583T priority Critical patent/ATE5360T1/en
Publication of EP0031482A1 publication Critical patent/EP0031482A1/en
Application granted granted Critical
Publication of EP0031482B1 publication Critical patent/EP0031482B1/en
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
    • H05B7/06—Electrodes

Definitions

  • the object is achieved in the contact electrode mentioned at the outset in that the mouth of the flow body made of a corrosion-resistant material has such an extension that uniformly intensive cooling of the end face of the contact electrode is ensured.
  • a steel head as a wearing part is metallically connected to the end face of the contact electrode in a manner known per se.

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

Abstract

1. A contact electrode for melting and heating furnaces with direct current plasma heating, in which a flow member (4) is provided in a bore (3) in the contact electrode (1) for the supply of a cooling medium, the flow member orifice being situated opposite the end face (6) of the contact electrode, characterized in that the orifice of the flow member (4), which is made from a corrosion resistant material, has a widening (5) such as to ensure uniformly intensive cooling of the end face (6) of the contact electrode (1).

Description

Die Erfindung bezieht sich auf eine Kontaktelektrode für Schmelz- und Wärmeöfen mit Gleichstromplasmabeheizung, wobei in einer Bohrung der Kontaktelektrode zur Zuführung eines Kühlmediums ein Strömungskörper vorgesehen ist, dessen Mündung der Stirnfläche der Kontaktelektrode gegenüberliegt. Kontaktelektroden mit einer Kühlung durch Wasser oder andere Medien sind bekannt. Sie weisen häufig schlechte elektrische Kontakt- sowie ungenügende Wärmeübergangs- und Kühlmittelströmungsverhältnisse auf, die zum Anschmelzen bzw. zur Zerstörung der Kontaktelektroden führen. Bei Plasmaschmelzöfen mit hohen Stromstärken ist die Kontaktelektrode besonders starkem thermischen Verschleiß unterworfen, wodurch ihre Haltbarkeit begrenzt wird.The invention relates to a contact electrode for melting and heating furnaces with direct current plasma heating, wherein a flow body is provided in a bore of the contact electrode for supplying a cooling medium, the mouth of which lies opposite the end face of the contact electrode. Contact electrodes with cooling by water or other media are known. They often have poor electrical contact and inadequate heat transfer and coolant flow conditions, which lead to melting or destruction of the contact electrodes. In the case of plasma melting furnaces with high currents, the contact electrode is subject to particularly severe thermal wear, which limits its durability.

Die DE-A-2637632 beschreibt eine Kontaktelektrode für Schmelz- und Wärmeöfen mit Gleichstromplasmabeheizung. Die FR-A-2 054 750 beschreibt eine Kontaktelektrode für Glasschmelz- und Wärmeöfen, wobei in einer Bohrung der beiden Kontaktelektroden zur Zuführung eines Kühlmediums ein Strömungskörper vorgesehen ist, der die Form eines Rohres aufweist.DE-A-2637632 describes a contact electrode for melting and heating furnaces with direct current plasma heating. FR-A-2 054 750 describes a contact electrode for glass melting and heating furnaces, a flow body having the shape of a tube being provided in a bore in the two contact electrodes for supplying a cooling medium.

Das Ziel der Erfindung besteht darin, Kontaktelektroden für Schmelz- und Wärmeöfen mit Gleichstromplasmabeheizung und hohen Stromstärken, vorzugsweise im Bereich von 10 bis 40 kA, mit hoher Lebensdauer, günstigen Wärmeübergangsbedingungen und niedrigem Materialverbrauch zu schaffen.The aim of the invention is to provide contact electrodes for melting and heating furnaces with direct current plasma heating and high current intensities, preferably in the range from 10 to 40 kA, with a long service life, favorable heat transfer conditions and low material consumption.

Erfindungsgemäß wird die Aufgabe bei der eingangs erwähnten Kontaktelektrode dadurch gelöst, daß die Mündung des aus einem korrosionsbeständigen Werkstoff hergestellten Strömungskörpers eine derartige Erweiterung aufweist, daß eine gleichmäßig intensive Kühlung der Stirnfläche der Kontaktelektrode gewährleistet ist.According to the invention the object is achieved in the contact electrode mentioned at the outset in that the mouth of the flow body made of a corrosion-resistant material has such an extension that uniformly intensive cooling of the end face of the contact electrode is ensured.

Ferner wird vorgeschlagen, daß sich unterhalb der Stirnfläche der Kontaktelektrode ein Temperaturgeber befindet. Dadurch werden außergewöhnliche thermische Belastungen signalisiert.It is also proposed that a temperature sensor is located below the end face of the contact electrode. This signals unusual thermal loads.

Ferner wird vorgeschlagen, daß in an sich bekannter Weise ein Stahlkopf als Verschleißteil mit der Stirnfläche der Kontaktelektrode metallisch verbunden ist.It is also proposed that a steel head as a wearing part is metallically connected to the end face of the contact electrode in a manner known per se.

Die Erfindung wird anhand einer Zeichnung näher erläutert. Mit der Kontaktelektrode 1 ist ein als Verschleißteil ausgebildeter Stahlkopf 2 metallisch verbunden. In der Bohrung 3 der Kontaktelektrode 1 befindet sich der Strömungskörper4, der durch die besondere Ausbildung seiner Sitrnfläche die gleichmäßige Kühlung der Stirnfläche 6 der Kontaktelektrode 1 bewirkt. Zum Signalisieren außergewöhnlicher thermischer Belastungen befindet sich unterhalb der Stirnfläche 6 ein Temperaturgeber 7.The invention is explained in more detail with reference to a drawing. A steel head 2 designed as a wearing part is metallically connected to the contact electrode 1. The flow body 4 is located in the bore 3 of the contact electrode 1 and, due to the special design of its surface, causes the end face 6 of the contact electrode 1 to be uniformly cooled. A temperature sensor 7 is located below the end face 6 for signaling unusual thermal loads.

Claims (3)

1. A contact electrode for melting and heating furnaces with direct current plasma heating, in which a flow member (4) is provided in a bore (3) in the contact electrode (1) for the supply of a cooling medium, the flow member orifice being situated opposite the end face (6) of the contact electrode, characterised in that the orifice of the flow member (4), which is made from a corrosion resistant material, has a widening (5) such as to ensure uniformly intensive cooling of the end face (6) of the contact electrode (1).
2. A contact electrode according to claim 1, characterised in that a temperature pick-up (7) is provided beneath the end face (6) of the contact electrode (1
3. A contact electrode according to claim 1, characterised in that a steel head (2) is provided in known manner as a wearing component and is metallically connected to the end face of the contact electrode (1).
EP80107583A 1979-12-19 1980-12-04 Contact electrode for fusion and heating furnaces with direct current plasma heating Expired EP0031482B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107583T ATE5360T1 (en) 1979-12-19 1980-12-04 CONTACT ELECTRODE FOR MELTING AND HEATING FURNACES WITH DIRECT CURRENT PLASMA HEATING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD217836 1979-12-19
DD21783679 1979-12-19

Publications (2)

Publication Number Publication Date
EP0031482A1 EP0031482A1 (en) 1981-07-08
EP0031482B1 true EP0031482B1 (en) 1983-11-16

Family

ID=5521768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107583A Expired EP0031482B1 (en) 1979-12-19 1980-12-04 Contact electrode for fusion and heating furnaces with direct current plasma heating

Country Status (6)

Country Link
EP (1) EP0031482B1 (en)
JP (1) JPS56132794A (en)
AT (1) ATE5360T1 (en)
DE (1) DE3065637D1 (en)
ES (1) ES267964Y (en)
YU (1) YU311480A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0133652B1 (en) * 1983-07-28 1987-01-21 BBC Aktiengesellschaft Brown, Boveri & Cie. Protective device for a bottom electrode of a direct current arc furnace
EP0133931B1 (en) * 1983-07-28 1987-01-07 BBC Brown Boveri AG Cooling arrangement of a bottom electrode of a direct current arc furnace
DE3339514A1 (en) * 1983-10-28 1985-05-09 Mannesmann AG, 4000 Düsseldorf ELECTRODE ARRANGEMENT IN WARM-TYPE VESSELS
GB8802957D0 (en) * 1988-02-09 1988-03-09 Electricity Council Heating apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1565468A (en) * 1967-02-02 1969-05-02
FR2054750A5 (en) * 1969-07-25 1971-05-07 Baccarat Cristalleries Electrode for crystal glass melting furnace
DE2637632A1 (en) * 1976-08-20 1978-02-23 Schelepov Bottom electrode for plasma arc melting furnace - where pressurised gas zone indicates electrode wear, and acts as safety device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53125911A (en) * 1977-04-11 1978-11-02 Inst Elektroswarki Patona Feed apparatus for plasma arc furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1565468A (en) * 1967-02-02 1969-05-02
FR2054750A5 (en) * 1969-07-25 1971-05-07 Baccarat Cristalleries Electrode for crystal glass melting furnace
DE2637632A1 (en) * 1976-08-20 1978-02-23 Schelepov Bottom electrode for plasma arc melting furnace - where pressurised gas zone indicates electrode wear, and acts as safety device

Also Published As

Publication number Publication date
JPS56132794A (en) 1981-10-17
DE3065637D1 (en) 1983-12-22
ATE5360T1 (en) 1983-12-15
EP0031482A1 (en) 1981-07-08
ES267964Y (en) 1984-08-01
ES267964U (en) 1984-01-16
YU311480A (en) 1982-08-31

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