EP0196432B1 - Arc furnace - Google Patents

Arc furnace Download PDF

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Publication number
EP0196432B1
EP0196432B1 EP86101929A EP86101929A EP0196432B1 EP 0196432 B1 EP0196432 B1 EP 0196432B1 EP 86101929 A EP86101929 A EP 86101929A EP 86101929 A EP86101929 A EP 86101929A EP 0196432 B1 EP0196432 B1 EP 0196432B1
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EP
European Patent Office
Prior art keywords
furnace
furnace vessel
casing portion
electric arc
lower casing
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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
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EP86101929A
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German (de)
French (fr)
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EP0196432A1 (en
Inventor
Horst Dipl.-Ing. Willaschek
Heinz Dipl.-Ing. Berentsen
Norbert Jäger
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MAN Gutehoffnungshutte GmbH
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MAN Gutehoffnungshutte GmbH
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Priority to AT86101929T priority Critical patent/ATE52846T1/en
Publication of EP0196432A1 publication Critical patent/EP0196432A1/en
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Publication of EP0196432B1 publication Critical patent/EP0196432B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/08—Heating by electric discharge, e.g. arc discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/24—Cooling arrangements

Definitions

  • the invention relates to an electric arc furnace with a vessel shell upper part, which at least partially consists of a lining with water-cooled wall elements, and with a vessel shell lower part with refractory lining, the vessel shell having vertical ribs on its outer, cylindrical surface.
  • Arc furnaces with pouring spouts or floor tapping are nowadays operated with high electrical outputs and short batch times.
  • This method of furnace requires the use of highly wear-resistant brick lining or water-cooled wall elements and water-cooled lids.
  • the lining in the electric arc furnace, especially in the area directly above the slag zone and at the hot spots, is consequently exposed to an increasing load, which results in earlier wear and thus forces the worn parts to be replaced more often.
  • US-A-2 711 311 is concerned with a water cooling system for blast furnaces.
  • Vertical ribs are provided on the outer shell of the furnace, which are connected in one piece to the furnace shell.
  • Weirs in the form of angle plates are provided between the vertical ribs to control the flow of the cooling water.
  • BE-A-556 212 relates to a cooling method for a brick shaft furnace.
  • the furnace has outer metallic cooling fins.
  • EP-A-0 116 696 describes a vessel for an electric furnace, equipped in the upper area with removable cooling units for water and evaporative cooling. Vessel supports connected to the supporting structure of the lower vessel are distributed around the circumference of the vessel.
  • DE-C-312 905 a fitting for a Martinofen is described, which is provided with ribs, the main direction of which can be arranged parallel or overlapping. This is to ensure that the masonry of the furnace gives off its heat to the surface of the fitting which is enlarged by the ribs.
  • the object of the invention is to provide an arc furnace with a vessel shell upper part, which at least partially consists of a lining with water-cooled wall elements, and with a vessel shell lower part with a fireproof lining, the vessel shell having vertical ribs on its outer, cylindrical surface Design that the use of the optimized stone qualities mentioned above is made possible without the disadvantages mentioned.
  • the heat-emitting surface is enlarged, so that heat accumulation in the vessel jacket is prevented.
  • the vertical arrangement of the ribs proves to be particularly advantageous in that a natural, directed air flow with good convection can be achieved and the radial thermal expansion of the vessel jacket is not hindered.
  • the ribs can be welded over their entire surface to the lower part of the vessel jacket, which means a welded connection over the entire end face of the ribs which abut the vessel jacket.
  • it can also be expedient to weld the ribs to the vessel jacket with continuous or interrupted fillet welds.
  • Ribs can be made from sheet metal strips, section steels (e.g. L, T, U sections etc.) or hollow sections. Steel, cast steel, cast iron, non-ferrous metal or composite metal can be used as the material for producing the ribs.
  • the lower part of the vessel jacket can also be produced in such a way that it consists of several jacket segments which are connected by welding T, U or L profiles together.
  • the ribs arranged on the lower part of the vessel jacket can, which has been found to be particularly advantageous, be designed in such a way that their shape forms completely or partially closed vertical cooling channels, which can be extended to below the furnace platform.
  • the annular gap between the tilting platform of the furnace and the furnace vessel jacket so large that the width of the annular gap matches the dimensions of the cooling channels formed by the ribs on the vessel jacket.
  • the air conversion to improve the convection on the arc furnace wall can possibly be further improved if external ventilation is provided by fans.
  • the refractory bricks with high heat transfer according to the claims are, for example, carbon bricks.
  • Fig. 2 to 7 detail horizontal sections of the furnace vessel jacket.
  • the upper part and lower part are separated from the wall elements and the brickwork in the transition area to ensure independent working in the event of temperature stress between the two parts.
  • the upper and lower parts of the vessel jacket are detachably connected to one another by screw connections (not shown).
  • the vertical ribs 7 with which this jacket part is provided all around can be seen on the vessel jacket lower part 3. These ribs 7 serve to enlarge the heat-emitting surface and, in this respect, are intended to avoid heat accumulation in the vessel jacket.
  • the supports of the furnace support frame are designated 4.
  • Stiffening rings 11, which are connected to the furnace support frame 4, are placed around the lower vessel part 3.
  • rib 7 on the right, which is welded to the vessel jacket 3 over the entire surface.
  • rib shapes such as 1, L, T profiles, as well as ribs which are formed from half-tubes.
  • Fig. 4 shows a section of the vessel jacket lower part 3 with ribs 7, the jacket with ribs consisting of one piece. They can be manufactured by forging, casting, pressing or mechanical processing from thick-walled blanks.
  • the lower part of the vessel jacket is made by welding T-section steels together, whereby a ribbed vessel jacket is formed.
  • Closed vertical cooling channels 8 can be produced by welding two L-profiles (FIG. 7, left), two T-profiles (FIG. 7, center) or U-profiles (FIG. 7, right).
  • FIG. 6 shows an embodiment in which the lower part 3 of the vessel jacket consists of loosely inserted jacket plates with ribs 7.
  • the jacket sheets only have contact with the furnace support frame 4 via spacer blocks 9.
  • the vertical gap between the jacket sheets serves for radial thermal expansion.
  • FIG. 1 In the enlarged section of FIG. 1 surrounded by a circle, the area of the annular gap 6 between the tilting platform 5 and the lower part 3 of the vessel jacket is shown.
  • a circumferential baffle 10 under the tilting platform 5 serves to guide the cooling air which is to get from below upwards into the cooling channels 8 formed by the ribs 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Discharge Heating (AREA)

Abstract

1. An electric arc furnace comprising - a furnace vessel upper casing portion which at least partially comprises a lining with water-cooled wall elements, and - a furnace vessel lower casing portion with a refractory lining, wherein the furnace vessel casing has vertical ribs on its outer cylindrical surface, characterised in that - the lining of the furnace vessel lower casing portion (3) comprises refractory bricks with a high degree of heat transmission, and - only the furnace vessel lower casing portion (3) has ribs (7) which are suitable for air cooling in that they form completely or partially closed cooling passages (8) which are extended to below the furnace charging floor (5), - that funnel-shaped guide plates (10) are provided for directing the flow of air, with an annular gap (6) between the tippable furnace charging floor (5) and the furnace vessel (1), and - the ribs (7) are welded to the furnace vessel casing (3) or are produced in one piece therewith.

Description

Die Erfindung betrifft einen Lichtbogenofen mit einem Gefäßmantel-Oberteil, das zumindest teilweise aus einer Auskleidung mit wassergekühlten Wandelementen besteht, und mit einem Gefäßmantel-Unterteil mit feuerfester Auskleidung, wobei der Gefäßmantel auf seiner äußeren, zylindrischen Oberfläche vertikale Rippen aufweist.The invention relates to an electric arc furnace with a vessel shell upper part, which at least partially consists of a lining with water-cooled wall elements, and with a vessel shell lower part with refractory lining, the vessel shell having vertical ribs on its outer, cylindrical surface.

Lichtbogenöfen mit Ausgußschnauze oder Bodenabstich werden heutzutage mit hohen elektrischen Leistungen und kurzen Chargenzeiten gefahren. Diese Ofenfahrweise bedingt den Einsatz von hochverschleißfester Ausmauerung oder wassergekühlten Wandelementen sowie wassergekühlten Deckeln. Die im Lichtbogenofen vorhandene Ausmauerung, insbesondere im Bereich unmittelbar über der Schlackenzone und an den hot spots, ist infolgedessen einer steigenden Belastung ausgesetzt, die einen früheren Verschleiß zur Folge hat und damit zum öfteren Auswechseln der verschlissenen Teile zwingt.Arc furnaces with pouring spouts or floor tapping are nowadays operated with high electrical outputs and short batch times. This method of furnace requires the use of highly wear-resistant brick lining or water-cooled wall elements and water-cooled lids. The lining in the electric arc furnace, especially in the area directly above the slag zone and at the hot spots, is consequently exposed to an increasing load, which results in earlier wear and thus forces the worn parts to be replaced more often.

Um die Haltbarkeit der Ausmauerung in den gefährdeten Bereichen zu verbessern, wurden spezielle Steinqualitäten, wie beispielsweise kohlenstoffhaltige Steine, entwickelt. Mit diesen Steinqualitäten lassen sich infolge des hohen Wärmedurchgangs längere Standzeiten erzielen.To improve the durability of the brickwork in the endangered areas, special stone qualities, such as carbon-containing stones, were developed. With these stone qualities, longer service lives can be achieved due to the high heat transfer.

Der hohe Wärmedurchgang führt nicht nur örtlich, sondern auch großflächig zur Überhitzung der Mantelbleche. Bei Mantelblechen, deren radiale Dehnung behindert ist, wirkt sich diese hohe Temperaturbelastung in der Weise aus, daß Verformungen der Mantelbleche auftreten, die letztlich zur Zerstörung nicht nur der Mantelbleche selbst, sondern auch des Stützgerüstes des Schmelzgefäßes führen können.The high heat transfer not only leads to overheating of the cladding sheets locally, but also over a large area. In the case of cladding sheets whose radial expansion is impeded, this high temperature load has the effect that deformations of the cladding sheets occur, which can ultimately lead to the destruction not only of the cladding sheets themselves, but also of the supporting structure of the melting vessel.

Die US-A-2 711 311 befaßt sich mit einem Wasser-Kühlsystem für Hochöfen. Am Außenmantel des Ofens sind senkrechte Rippen vorgesehen, die einteilig mit dem Ofenmantel verbunden sind. Zwischen den senkrechten Rippen sind Wehre in Form von Winkelblechen vorgesehen, um den Fluß des Kühlwassers zu kontrollieren.US-A-2 711 311 is concerned with a water cooling system for blast furnaces. Vertical ribs are provided on the outer shell of the furnace, which are connected in one piece to the furnace shell. Weirs in the form of angle plates are provided between the vertical ribs to control the flow of the cooling water.

Die BE-A-556 212 betrifft ein Kühlverfahren für einen ausgemauerten Schachtofen. Der Ofen weist äußere metallische Kühlrippen auf.BE-A-556 212 relates to a cooling method for a brick shaft furnace. The furnace has outer metallic cooling fins.

Die EP-A-0 116 696 beschreibt ein Gefäß für einen Elektroofen, im oberen Bereich ausgerüstet mit ausbaubaren Kühleinheiten für Wasser- und Verdampfungskühlung. Am Gefäßumfang verteilt sind mit der Tragkonstruktion des Untergefä- ßes verbundene Gefäßstützen angeordnet.EP-A-0 116 696 describes a vessel for an electric furnace, equipped in the upper area with removable cooling units for water and evaporative cooling. Vessel supports connected to the supporting structure of the lower vessel are distributed around the circumference of the vessel.

Schließlich wird in der DE-C-312 905 eine Armaturplatte für einen Martinofen beschrieben, die mit Rippen versehen ist, deren Hauptrichtung parallel oder sich überschneidend angeordnet sein kann. Damit soll erreicht werden, daß das Mauerwerk des Ofens seine Wärme auf die durch die Rippen vergrößerte Oberfläche der Armatur abgibt.Finally, in DE-C-312 905 a fitting for a Martinofen is described, which is provided with ribs, the main direction of which can be arranged parallel or overlapping. This is to ensure that the masonry of the furnace gives off its heat to the surface of the fitting which is enlarged by the ribs.

Aufgabe der Erfindung ist es, einen Lichtbogenofen mit einem Gefäßmantel-Oberteil, das zumindest teilweise aus einer Auskleidung mit wassergekühlten Wandelementen besteht, und mit einem Gefäßmantel-Unterteil mit feuerfester Auskleidung, wobei der Gefäßmantel auf seiner äußeren, zylindrischen Oberfläche vertikale Rippen aufweist, derart zu gestalten, daß der Einsatz der eingangs genannten optimierten Steinqualitäten ermöglicht wird, ohne daß die aufgezeigten Nachteile auftreten.The object of the invention is to provide an arc furnace with a vessel shell upper part, which at least partially consists of a lining with water-cooled wall elements, and with a vessel shell lower part with a fireproof lining, the vessel shell having vertical ribs on its outer, cylindrical surface Design that the use of the optimized stone qualities mentioned above is made possible without the disadvantages mentioned.

Diese Aufgabe wird in der Weise gelöst, wie es in den Patentansprüchen angegeben ist.This object is achieved in the manner as specified in the patent claims.

Durch die erfindungsgemäße Ausbildung des Gefäßmantel-Unterteils nach Anspruch 1 wird die wärmeabgebende Oberfläche vergrößert, so daß im Gefäßmantel ein Wärmestau verhindert wird. Die vertikale Anordnung der Rippen erweist sich insofern als besonders vorteilhaft, als eine natürliche, gerichtete Luftströmung mit guter Konvektion erzielbar ist und die radiale Wärmedehnung des Gefäßmantels nicht behindert wird.By designing the lower part of the vessel jacket according to the invention, the heat-emitting surface is enlarged, so that heat accumulation in the vessel jacket is prevented. The vertical arrangement of the ribs proves to be particularly advantageous in that a natural, directed air flow with good convection can be achieved and the radial thermal expansion of the vessel jacket is not hindered.

Die Rippen lassen sich ganzflächig an das Gefäßmantel-Unterteil anschweißen, worunter eine Schweißverbindung über die gesamte Stirnfläche der Rippen, die am Gefäßmantel anliegen, zu verstehen ist. Andererseits kann es auch zweckmäßig sein, die Rippen mit durchgehenden oder aber unterbrochenen Kehlnähten an den Gefäßmantel anzuschweißen.The ribs can be welded over their entire surface to the lower part of the vessel jacket, which means a welded connection over the entire end face of the ribs which abut the vessel jacket. On the other hand, it can also be expedient to weld the ribs to the vessel jacket with continuous or interrupted fillet welds.

Als Rippen oder Vorsprünge usw. sind eine ganze Reihe von Ausführungsformen denkbar. Man kann Rippen aus Blechstreifen, Profilstählen (z.B. L-, T-, U-profilen usw.) oder Hohlprofilen herstellen. Als Material zur Herstellung der Rippen läßt sich Stahl, Stahlguß, Grauguß, Nichteisenmetall oder Verbundmetall verwenden.A whole series of embodiments are conceivable as ribs or projections etc. Ribs can be made from sheet metal strips, section steels (e.g. L, T, U sections etc.) or hollow sections. Steel, cast steel, cast iron, non-ferrous metal or composite metal can be used as the material for producing the ribs.

Das Gefäßmantel-Unterteil läßt sich auch so herstellen, daß es aus mehreren Mantelsegmenten besteht, die durch Aneinanderschweißen von T-, U- oder L-Profilen verbunden sind.The lower part of the vessel jacket can also be produced in such a way that it consists of several jacket segments which are connected by welding T, U or L profiles together.

Die am Gefäßmantel-Unterteil angeordneten Rippen können, was sich als besonders vorteilhaft herausgestellt hat, so gestaltet werden, daß durch ihre Formgebung vollständig oder teilweise geschlossene vertikale Kühlkanäle gebildet werden, die bis unter die Ofenbühne verlängert werden können.The ribs arranged on the lower part of the vessel jacket can, which has been found to be particularly advantageous, be designed in such a way that their shape forms completely or partially closed vertical cooling channels, which can be extended to below the furnace platform.

Um die natürliche Luftströmung durch die somit entstandenen Kühlkanäle noch zu verbessern, ist es zweckmäßig, den Ringspalt zwischen Kippbühne des Ofens und dem Ofengefäßmantel so groß zu bemessen, daß die Breite des Ringspaltes mit den Abmessungen der durch die Rippen am Gefäßmantel gebildeten Kühlkanäle übereinstimmt. Der Luftumsatz zur Verbesserung der Konvektion an der Lichtbogenofenwand läßt sich gegebenenfalls noch weiter verbessern, wenn man eine Fremdbelüftung durch Ventilatoren vorsieht.In order to improve the natural air flow through the cooling channels thus created, it is expedient to dimension the annular gap between the tilting platform of the furnace and the furnace vessel jacket so large that the width of the annular gap matches the dimensions of the cooling channels formed by the ribs on the vessel jacket. The air conversion to improve the convection on the arc furnace wall can possibly be further improved if external ventilation is provided by fans.

Die feuerfesten Steine mit hohem Wärmedurchgang nach den Patentansprüchen sind beispielsweise kohlenstoffhaltige Steine.The refractory bricks with high heat transfer according to the claims are, for example, carbon bricks.

Ausführungsbeispiele der Erfindung werden nachstehend anhand der schematischen Zeichnungen näher erläutert.Embodiments of the invention are explained below with reference to the schematic drawings.

Es zeigen Fig. 1 eine Ansicht eines Lichtbogen-Ofengefäßes,1 shows a view of an arc furnace vessel,

Fig. 2 bis 7 ausschnittsweise Horizontalschnitte des Ofengefäßmantels.Fig. 2 to 7 detail horizontal sections of the furnace vessel jacket.

Das Ofengefäß 1 nach Fig. 1 weist ein Gefäßmantel- Oberteil 2 und ein Gefäßmantel-Unterteil 3 auf. Oberteil und Unterteil sind im Übergangsbereich von Wandelementen und Ausmauerung getrennt, um ein unabhängiges Arbeiten bei Temperaturbeanspruchung zwischen beiden Teilen zu gewährleisten. An den Trennstellen sind Gefäßmantel-Ober- und -Unterteil durch (nicht dargestellte) Schraubverbindungen lösbar miteinander verbunden.1 has an upper shell 2 and a lower shell 3. The upper part and lower part are separated from the wall elements and the brickwork in the transition area to ensure independent working in the event of temperature stress between the two parts. At the separation points, the upper and lower parts of the vessel jacket are detachably connected to one another by screw connections (not shown).

Am Gefäßmantel-Unterteil 3 erkennt man die vertikalen Rippen 7, mit denen dieser Mantelteil ringsum versehen ist. Diese Rippen 7 dienen der Vergrößerung der wärmeabgebenden Oberfläche und sollen insofern einen Wärmestau im Gefäßmantel vermeiden.The vertical ribs 7 with which this jacket part is provided all around can be seen on the vessel jacket lower part 3. These ribs 7 serve to enlarge the heat-emitting surface and, in this respect, are intended to avoid heat accumulation in the vessel jacket.

Die Stützen des Ofen-Traggerüstes sind mit 4 bezeichnet. Um das Gefäßmantel-Unterteil 3 sind Aussteifungsringe 11 gelegt, die mit dem Ofen-Traggerüst 4 verbunden sind.The supports of the furnace support frame are designated 4. Stiffening rings 11, which are connected to the furnace support frame 4, are placed around the lower vessel part 3.

Der Ofengefäßmantel-Ausschnitt gemäß Fig. 2 zeigt rechts eine Rippe 7, die ganzflächig an den Gefäßmantel 3 angeschweißt ist. Die linke Rippe 7 ist dagegen mittels Kehlnaht, d.h. nicht ganzflächig, angeschweißt. Es kann sich dabei um eine gänzlich oder teilweise umlaufende Kehlnaht handeln.2 shows a rib 7 on the right, which is welded to the vessel jacket 3 over the entire surface. The left rib 7, however, is by means of fillet weld, i.e. not all over, welded on. It can be a fully or partially circumferential fillet weld.

In Fig. 3 sind unterschiedliche Rippenformen gezeigt, wie 1-, L-, T-Profile, sowie Rippen, die aus Halbrohren gebildet werden.In Fig. 3 different rib shapes are shown, such as 1, L, T profiles, as well as ribs which are formed from half-tubes.

Fig. 4 zeigt einen Ausschnitt des Gefäßmantel-Unterteils 3 mit Rippen 7, wobei Mantel mit Rippen aus einem Stück bestehen. Die Herstellung kann durch Schmieden, Gießen, Pressen oder mechanische Bearbeitung aus dickwandigen Rohlingen erfolgen.Fig. 4 shows a section of the vessel jacket lower part 3 with ribs 7, the jacket with ribs consisting of one piece. They can be manufactured by forging, casting, pressing or mechanical processing from thick-walled blanks.

Nach Fig. 5 ist das Gefäßmantel-Unterteil durch Aneinanderschweißen von T-Profilstählen hergestellt, wodurch ein berippter Gefäßmantel gebildet wird.According to FIG. 5, the lower part of the vessel jacket is made by welding T-section steels together, whereby a ribbed vessel jacket is formed.

Durch Anschweißen von jeweils zwei L-Profilen (Fig. 7, links), zwei T-Profilen (Fig. 7, Mitte) oder U-Profilen (Fig. 7, rechts) lassen sich geschlossene vertikale Kühlkanäle 8 herstellen.Closed vertical cooling channels 8 can be produced by welding two L-profiles (FIG. 7, left), two T-profiles (FIG. 7, center) or U-profiles (FIG. 7, right).

In Fig. 6 ist eine Ausführungsform dargestellt, bei der das Gefäßmantel-Unterteil 3 aus lose eingesetzten Mantelblechen mit Rippen 7 besteht. Die Mantelbleche haben nur über Distanzklötze 9 Kontakt mit dem Ofen-Traggerüst 4. Der Vertikalspalt zwischen den Mantelblechen dient der radialen Wärmedehnung.6 shows an embodiment in which the lower part 3 of the vessel jacket consists of loosely inserted jacket plates with ribs 7. The jacket sheets only have contact with the furnace support frame 4 via spacer blocks 9. The vertical gap between the jacket sheets serves for radial thermal expansion.

In dem von einem Kreis umgebenen vergrößerten Ausschnitt der Fig. 1 ist der Bereich des Ringspaltes 6 zwischen Kippbühne 5 und Gefäßmantel-Unterteil 3 dargestellt. Ein umlaufendes Leitblech 10 unter der Kippbühne 5 dient der Führung der Kühlluft, die von unten aufwärts in die von den Rippen 7 gebildeten Kühlkanäle 8 gelangen soll.In the enlarged section of FIG. 1 surrounded by a circle, the area of the annular gap 6 between the tilting platform 5 and the lower part 3 of the vessel jacket is shown. A circumferential baffle 10 under the tilting platform 5 serves to guide the cooling air which is to get from below upwards into the cooling channels 8 formed by the ribs 7.

Claims (8)

1. An electric arc furnace comprising
- a furnace vessel upper casing portion which at least partially comprises a lining with water- cooled wall elements, and
- a furnace vessel lower casing portion with a refractory lining, wherein the furnace vessel casing has vertical ribs on its outer cylindrical surface,
characterised in that
- the lining of the furnace vessel lower casing portion (3) comprises refractory bricks with a high degree of heat transmission, and
- only the furnace vessel lower casing portion (3) has ribs (7) which are suitable for air cooling in that they form completely or partially closed cooling passages (8) which are extended to below the furnace charging floor (5),
- that funnel-shaped guide plates (10) are provided for directing the flow of air, with an annular gap (6) between the tippable furnace charging floor (5) and the furnace vessel (1), and
- the ribs (7) are welded to the furnace vessel casing (3) or are produced in one piece therewith.
2. An electric arc furnace according to claim 1 characterised in that the furnace vessel lower casing portion (3) is composed of a plurality of casing segments which are connected by welding together T-, U- or L-shaped members.
3. An electric arc furnace according to claim 2 characterised in that the loosely inserted casing segments are supported by way of spacer blocks (9) relative to the carrier frame structure (4) of the furnace vessel (1).
4. An electric arc furnace according to claim 1 characterised in that the width of the annular gap (6) corresponds at least to the width of the cooling passages (8).
5. An electric arc furnace according to one of claims 1 to 4 characterised in that an independent ventilating means is provided for producing the flow of air at the ribbed furnace vessel lower casing portion (3).
6. An electric arc furnace according to claim 1 characterised in that the furnace vessel upper casing portion (2) is separated from the furnace vessel lower casing portion (3) in the transitional region between the wall elements and the refractory lining.
7. An electric arc furnace according to claim 6 characterised in that the furnace vessel upper casing portion (2) is connected to the furnace vessel lower casing portion (3) at the separation points by screws, keys or other releasable connecting means.
8. An electric arc furnace according to one of claims 1 to 7 characterised in that the refractory bricks with a high degree of heat transmission are carbonaceous bricks.
EP86101929A 1985-03-01 1986-02-14 Arc furnace Expired - Lifetime EP0196432B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86101929T ATE52846T1 (en) 1985-03-01 1986-02-14 ARC FURNACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3507182 1985-03-01
DE19853507182 DE3507182A1 (en) 1985-03-01 1985-03-01 MELTING CASE, ESPECIALLY ARC FURNACE

Publications (2)

Publication Number Publication Date
EP0196432A1 EP0196432A1 (en) 1986-10-08
EP0196432B1 true EP0196432B1 (en) 1990-05-16

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EP86101929A Expired - Lifetime EP0196432B1 (en) 1985-03-01 1986-02-14 Arc furnace

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EP (1) EP0196432B1 (en)
JP (2) JPS61223485A (en)
AT (1) ATE52846T1 (en)
DE (2) DE3507182A1 (en)

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DE3820448A1 (en) * 1988-06-16 1989-12-21 Thyssen Edelstahlwerke Ag Cooled wall element for metallurgical furnaces
DE4223109C1 (en) * 1992-07-14 1993-09-16 Reining Heisskuehlung Gmbh & Co Kg, 4330 Muelheim, De
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ATE52846T1 (en) 1990-06-15
JPS63165491U (en) 1988-10-27
DE3507182A1 (en) 1986-09-04
DE3507182C2 (en) 1988-05-05
DE3671286D1 (en) 1990-06-21
JPS61223485A (en) 1986-10-04
EP0196432A1 (en) 1986-10-08

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