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EP0181853B1 - Gas flushing plug for metallurgical furnaces and vessels - Google Patents

Gas flushing plug for metallurgical furnaces and vessels Download PDF

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Publication number
EP0181853B1
EP0181853B1 EP85890169A EP85890169A EP0181853B1 EP 0181853 B1 EP0181853 B1 EP 0181853B1 EP 85890169 A EP85890169 A EP 85890169A EP 85890169 A EP85890169 A EP 85890169A EP 0181853 B1 EP0181853 B1 EP 0181853B1
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EP
European Patent Office
Prior art keywords
gas
stone
vessels
gas supply
supply pipe
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
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EP85890169A
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German (de)
French (fr)
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EP0181853A1 (en
Inventor
Heinrich Illemann
Gustav-Mario Dipl. Ing. Heinricher
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Radex Austria AG fur Feuerfeste E
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RADEX AUSTRIA AG fur FEUERFESTE ERZEUGNISSE
Radex Austria AG fur Feuerfeste Erzeugnisse
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002Treatment with gases
    • B22D1/005Injection assemblies therefor

Definitions

  • the invention relates to a gas purging plug for metallurgical furnaces and vessels.
  • gas purging stones which are generally referred to as gas purging stones, are increasingly being used for blowing various gases into metallurgical furnaces and vessels through their linings for the treatment of metals or metal melts.
  • gas purging plugs are mostly arranged in the floor, particularly in converters for fresh iron, in pig iron pans, pouring ladles and tundish when continuously casting steel, but can be found in all these units and also in other metallurgical furnaces and vessels, e.g. Arc furnaces or vessels for the treatment of non-ferrous metals, such as aluminum melting furnaces, can also be installed in the lining of the side walls.
  • Gas purging stones are either stones with normal increased porosity, i.e. stones with an increased number of randomly distributed pores, or stones with a so-called directional porosity, these are stones in which a number of pores are in a desired direction throughout the whole Stone stretches, used. Stones with directed porosity have the advantage that, if desired, fine-grained solid substances can also be suspended in carrier gases through the directed pores.
  • gas purging stones of the type commonly used are of the type commonly used, their durability is less than that of the refractory lining in their vicinity in the relevant furnace or vessel, and then downtimes for this furnace or this vessel result from the premature wear of the gas purging stones. Attempts have therefore already been made in various ways to improve the durability of gas detection stones, which are usually arranged in a perforated stone.
  • a gas purging plug encased in sheet metal is known on its side walls and on its bottom surface, the purging stone floor, through the interior of which metal plates extend and at its end remote from the interior of the furnace or vessel, which forms the paving stone floor, and a gas supply pipe for the passage of gas through the gas purging plug into the metal melt to be treated, a spiral pipe for supplying the purging gas is connected to this gas supply pipe, the gas supply pipe and the spiral pipe being embedded in a refractory sintered material (FR-OS 2451 945).
  • the spiral tube is intended to serve to melt metal that has entered the interior of the gas purging stone as a result of wear or cracks and / or as a result of an at least partial destruction of the sheet metal jacket at the hot end of the gas purging stone into it or between it and the perforated stone is to solidify and thereby prevent further flow out of the metallurgical furnace or vessel.
  • a known gas purging plug has the particular disadvantage that it cannot be replaced and interruptions in the operation of the furnace or vessel are therefore necessary, since, despite the measures mentioned, this brick is subject to more rapid wear than the lining in its immediate vicinity.
  • a gas purging plug arranged in a refractory perforated brick in which the gas supply pipe is not connected directly to the gas purging plug, but instead is molded and molded into a refractory body, namely into the perforated brick itself or a refractory, block-like body arranged under the purging plug the gas purging line connected line coil, which may be spiral, is connected (DE-OS 3110204).
  • a breakthrough of metal cannot be prevented with this construction with certainty.
  • gas purging plugs which rest on a safety block at their end remote from the interior of the furnace or vessel, which forms the purging stone floor, and have a pipe system for the gas supply, which is formed by a double, partly vertical pipe coil and embedded in the safety block is (European patent application 105868).
  • a pipe system for the gas supply which is formed by a double, partly vertical pipe coil and embedded in the safety block is (European patent application 105868).
  • the invention now aims to provide a gas purging plug for metallurgical furnaces and vessels, which is connected at its cold stone end remote from the furnace interior or vessel interior to a gas supply pipe and with the aid of which simple measures are possible to reduce the risk of a breakthrough Prevent metal melt through the gas supply pipe in an effective manner.
  • the invention relates to a refractory gas purging plug for metallurgical furnaces and vessels, which is connected at its cold stone end remote from the furnace interior or vessel interior to a gas supply pipe and is characterized in that a fully formed metal core with a helical shape extends centrally in the gas supply pipe and extends in the longitudinal direction thereof surrounding coil of metal is arranged.
  • the gas supply pipe at least in its part adjoining the cold stone end, can be surrounded concentrically by a protective pipe which is filled with a refractory mass.
  • the invention is explained in more detail with reference to the drawing, in which a gas purge provided with a sheet metal jacket is shown schematically in partial section stone is shown with a gas supply pipe and a surrounding protective pipe.
  • the gas purging plug designated 1 in the drawing can have any shape, for example the shape of a cuboid or a conical shape as shown, and can be arranged, for example, in a perforated brick (not shown).
  • the refractory material from which the stone 1 is constructed is also irrelevant to the present invention and can be selected in accordance with the intended use of the stone.
  • the sink 1 shown In addition to normal, that is to say randomly distributed, undirected pores 2, the sink 1 shown also has directed pores 3 which extend in its longitudinal direction and pass from the cold stone end to the stone end facing the interior of the furnace or the interior of the vessel, the hot stone end.
  • the gas purging stone 1 is encased on its side surfaces by a sheet metal jacket 5 and has a sheet metal base 6 on its cold stone end 4 lying away from the inside of the furnace or inside of the vessel.
  • a gap-shaped intermediate space 7, which can be referred to as a gas supply gap, can be present between the cold stone end 4 and the sheet metal base 6, in order to ensure a uniform distribution of the gas flow supplied over the stone cross-section.
  • the cold stone end 4 or the sheet metal base 6, if present, is connected to a gas feed pipe 8, through which the desired flushing gas or flushing medium is supplied to the gas flushing stone 1.
  • This coil 10, which suitably consists of steel wire and is wound around the metal core, is attached to the metal core 9 in a suitable manner, for. B. by welding (at 11) or by sheer resilient embracing, and lies on the inner wall of the gas supply pipe 8.
  • the purging medium flows through the space remaining between the metal core 9 and the inner wall of the gas supply pipe 8 to the gas purging plug 1.
  • the metal core 9 is in turn attached to the gas supply pipe 8 (at 12), for example by welding or with the aid of screws or bolts, which come from outside go through the wall of the gas supply pipe 8 inside.
  • the metal core 9 together with the helix 10 represents an effective breakthrough protection, because it is understandable that liquid metal, which may have broken through the gas purging plug 1 into the gas supply pipe 8, in this pipe through the metal core 9 and to the inner wall of this pipe adjacent helix 10 is forced to flow around the metal core several times, whereby it is cooled and soon solidified.
  • the gas supply pipe 8 can be concentrically surrounded, at least in its part adjoining the cold stone end 4, by a protective pipe 13 which is filled with a refractory mass 14, in particular a casting compound.
  • This protective tube 13 with the refractory mass 14 prevents further spread of a possible breakthrough of liquid metal through the wall of the gas supply tube 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Description

Die Erfindung betrifft einen Gasspülstein für metallurgische Öfen und Gefässe.The invention relates to a gas purging plug for metallurgical furnaces and vessels.

In neuerer Zeit werden in steigendem Umfang feuerfeste, gasdurchlässige Formkörper, die allgemein als Gasspülsteine bezeichnet werden, zum Einblasen verschiedener Gase in metallurgische Öfen und Gefässe durch deren Auskleidung hindurch zur Behandlung von Metallen bzw. Metallschmelzen verwendet. Diese Gasspülsteine werden insbesondere in Konvertern zum Frischen von Roheisen, in Roheisenpfannen, Giesspfannen und Zwischengefässen (Tundish) beim Stranggiessen von Stahl meist im Boden angeordnet, können jedoch in allen diesen Aggregaten und ebenso in anderen metallurgischen Öfen und Gefässen, z.B. Lichtbogenöfen oder Gefässen zur Behandlung von Nichteisenmetallen, wie Aluminiumschmelz- öfen, auch in die Auskleidung der Seitenwände eingebaut werden.Recently, refractory, gas-permeable moldings, which are generally referred to as gas purging stones, are increasingly being used for blowing various gases into metallurgical furnaces and vessels through their linings for the treatment of metals or metal melts. These gas purging plugs are mostly arranged in the floor, particularly in converters for fresh iron, in pig iron pans, pouring ladles and tundish when continuously casting steel, but can be found in all these units and also in other metallurgical furnaces and vessels, e.g. Arc furnaces or vessels for the treatment of non-ferrous metals, such as aluminum melting furnaces, can also be installed in the lining of the side walls.

Als Gasspülsteine werden entweder Steine mit normaler erhöhter Porosität, das heisst Steine mit einer erhöhten Anzahl von willkürlich verteilten Poren, oder aber Steine mit einer sogenannten gerichteten Porosität, das sind Steine, in welchen sich eine Anzahl von Poren in einer gewünschten Richtung durchgehend durch den ganzen Stein erstreckt, verwendet. Steine mit gerichteter Porosität haben den Vorteil, dass durch die gerichteten Poren gewünschtenfalls auch feinkörnige feste Stoffe in Trägergasen suspendiert werden können.Gas purging stones are either stones with normal increased porosity, i.e. stones with an increased number of randomly distributed pores, or stones with a so-called directional porosity, these are stones in which a number of pores are in a desired direction throughout the whole Stone stretches, used. Stones with directed porosity have the advantage that, if desired, fine-grained solid substances can also be suspended in carrier gases through the directed pores.

Ein häufiger Nachteil von Gasspülsteinen der üblicherweiseverwendeten Art besteht darin, dass ihre Haltbarkeit geringer ist als die der feuerfesten Auskleidung in ihrer Umgebung in dem betreffenden Ofen bzw. Gefäss und sich dann durch den vorzeitigen Verschleiss der Gasspülsteine Stillstandszeiten für diesen Ofen bzw. dieses Gefäss ergeben. Es ist daher bereits auf verschiedene Weise versucht worden, die Haltbarkeit von Gasspüfsteinen, die gewöhnlich in einem Lochstein angeordnet sind, zu verbessern. So ist beispielsweise ein an seinen Seitenwänden und auf seiner Bodenfläche, dem Spülsteinboden, mit Blech ummantelter Gasspülstein bekannt, durch dessen Inneres sich Metallplatten erstrecken und bei dem an seinem vom Ofeninneren bzw. Gefässinneren abliegenden Ende, das den Spülsteinboden bildet und ein Gaszuführungsrohr für das Durchleiten von Gas durch den Gasspülstein in die zu behandelnde Metallschmelze aufweist, an dieses Gaszuführungsrohr ein spiralförmiges Rohr zur Zuführung des Spülgases angeschlossen ist, wobei das Gaszuführungsrohr und das spiralförmige Rohr in einem feuerfesten Sintermaterial eingebettet sind (FR-OS 2451 945). Das spiralförmige Rohr soll bei dieser Konstruktion dazu dienen, Metallschmelze, die infolge des Verschteisses oder von Rissen des Gasspülsteines in dessen Inneres eingedrungen ist und/oder infolge einer zumindest teilweise Zerstörung des Blechmantels am heissen Ende des Gasspülsteines in diesen oder zwischen diesen und den Lochstein gelangt ist, zum Erstarren zu bringen und dadurch an einem weiteren Ausfliessen aus dem metallurgischen Ofen oder Gefäss zu hindern. Ein solcher bekannter Gasspülstein hat aber vor allem den Nachteil, dass er nicht auswechselbar ist und dadurch Unterbrechungen des Betriebes des Ofens oder Gefässes erforderlich werden, da dieser Stein trotz der angeführten Massnahmen einem rascheren Verschleiss unterliegt als die Auskleidung in seiner nächsten Umgebung. Ferner ist ein in einem feuerfesten Lochstein angeordneter Gasspülstein bekannt, bei dem das Gaszuführungsrohr nicht direkt an den Gasspülstein angeschlossen ist, sondern mit einer in einen feuerfesten Körper, nämlich in den Lochstein selbst oder einen unter dem Spülstein angeordneten feuerfesten, blockartigen Körper, eingeformten und an den Gasspülstein angeschlossenen Leitungsschlange, die spiralförmig ausgebildet sein kann, verbunden ist (DE-OS 3110204). Ein Durchbruch von Metall kann jedoch mit dieser Konstruktion nicht mit Sicherheit verhindert weden. Eine erhebliche Verbesserung wird mit Gasspülsteinen erreicht, die an ihrem vom Ofeninneren bzw. Gefässinneren abliegenden Ende, das den Spülsteinboden bildet, auf einem Sicherungsblock aufruhen und für die Gaszuführung ein Rohrsystem aufweisen, das von einer doppelten, teilweise vertikal verlaufenden Rohrschlange gebildet und im Sicherungsblock eingebettet ist (europäische Patentanmeldung 105868). Durch diese Teilung des Gaszuführungsrohres wird eine in das Rohr gegebenenfalls eindringendes flüssige Metallmenge, z.B. Stahlmenge, und damit deren Wärmeinhalt geteilt und ferner die Oberfläche zur rascheren Erstarrung der eingedrungenen Schmelze vergrössert; zusätzlich wird eine Erstarrung von eingedrungener Metallschmelze noch dadurch bewirkt, dass das Gaszuführungsrohr auch gegen die Richtung des ferrostatischen Druckes geführt ist.A common disadvantage of gas purging stones of the type commonly used is that their durability is less than that of the refractory lining in their vicinity in the relevant furnace or vessel, and then downtimes for this furnace or this vessel result from the premature wear of the gas purging stones. Attempts have therefore already been made in various ways to improve the durability of gas detection stones, which are usually arranged in a perforated stone. For example, a gas purging plug encased in sheet metal is known on its side walls and on its bottom surface, the purging stone floor, through the interior of which metal plates extend and at its end remote from the interior of the furnace or vessel, which forms the paving stone floor, and a gas supply pipe for the passage of gas through the gas purging plug into the metal melt to be treated, a spiral pipe for supplying the purging gas is connected to this gas supply pipe, the gas supply pipe and the spiral pipe being embedded in a refractory sintered material (FR-OS 2451 945). In this construction, the spiral tube is intended to serve to melt metal that has entered the interior of the gas purging stone as a result of wear or cracks and / or as a result of an at least partial destruction of the sheet metal jacket at the hot end of the gas purging stone into it or between it and the perforated stone is to solidify and thereby prevent further flow out of the metallurgical furnace or vessel. However, such a known gas purging plug has the particular disadvantage that it cannot be replaced and interruptions in the operation of the furnace or vessel are therefore necessary, since, despite the measures mentioned, this brick is subject to more rapid wear than the lining in its immediate vicinity. Furthermore, a gas purging plug arranged in a refractory perforated brick is known, in which the gas supply pipe is not connected directly to the gas purging plug, but instead is molded and molded into a refractory body, namely into the perforated brick itself or a refractory, block-like body arranged under the purging plug the gas purging line connected line coil, which may be spiral, is connected (DE-OS 3110204). A breakthrough of metal cannot be prevented with this construction with certainty. A significant improvement is achieved with gas purging plugs, which rest on a safety block at their end remote from the interior of the furnace or vessel, which forms the purging stone floor, and have a pipe system for the gas supply, which is formed by a double, partly vertical pipe coil and embedded in the safety block is (European patent application 105868). Through this division of the gas supply pipe, an amount of liquid metal, e.g. Amount of steel, and thus its heat content divided and further increases the surface area for faster solidification of the penetrated melt; in addition, solidification of the molten metal which has penetrated is brought about by the fact that the gas supply pipe is also guided against the direction of the ferrostatic pressure.

Die Erfindung zielt nun darauf ab, einen Gasspülstein für metallurgische Öfen und Gefässe zu schaffen, der an seinem vom Ofeninneren bzw. Gefässinneren abliegenden, kalten Steinende mit einem Gaszuführungsrohr verbunden ist und bei dem es mit Hilfe einfacher Massnahmen möglich ist, die Gefahr eines Durchbruches von Metallschmelze durch das Gaszuführungsrohr auf wirksame Weise zu verhindern. Demnach betrifft die Erfindung einen feuerfesten Gasspülstein für metallurgische Öfen und Gefässe, der an seinem vom Ofeninneren bzw. Gefässinneren abliegenden kalten Steinende mit einem Gaszuführungsrohr verbunden und dadurch gekennzeichnet ist, dass im Gaszuführungsrohr zentrisch sich in dessen Längsrichtung erstreckend ein voll ausgebildeter Metallkern mit einer ihn schraubenlinienförmig umgebenden Wendel aus Metall angeordnet ist. Zur weiteren Erhöhung der Sicherheit kann das Gaszuführungsrohr zumindest in seinem an das kalte Steinende anschliessenden Teil konzentrisch von einem Schutzrohr umgeben sein, das mit einer feuerfesten Masse gefüllt ist.The invention now aims to provide a gas purging plug for metallurgical furnaces and vessels, which is connected at its cold stone end remote from the furnace interior or vessel interior to a gas supply pipe and with the aid of which simple measures are possible to reduce the risk of a breakthrough Prevent metal melt through the gas supply pipe in an effective manner. Accordingly, the invention relates to a refractory gas purging plug for metallurgical furnaces and vessels, which is connected at its cold stone end remote from the furnace interior or vessel interior to a gas supply pipe and is characterized in that a fully formed metal core with a helical shape extends centrally in the gas supply pipe and extends in the longitudinal direction thereof surrounding coil of metal is arranged. To further increase safety, the gas supply pipe, at least in its part adjoining the cold stone end, can be surrounded concentrically by a protective pipe which is filled with a refractory mass.

Die Erfindung wird an Hand der Zeichnung näher erläutert, in der schematisch im Teilschnitt ein mit einer Blechummantelung versehener Gasspülstein mit einem Gaszuführungsrohr und einem dieses umgebenden Schutzrohr dargestellt ist. Der in der Zeichnung mit 1 bezeichnete Gasspülstein kann eine beliebige Form, z.B. wie gezeigt die Form eines Quaders oder eine konische Form, aufweisen und beispielsweise in einem (nicht dargestellten) Lochstein angeordnet sein. Auch das feuerfeste Material, aus dem der Stein 1 aufgebaut ist, ist für die vorliegende Erfindung ohne Belang und kann entsprechend dem vorgesehenen Verwendungszweck des Steines gewählt werden. Der dargestellte Spülstein 1 hat neben normalen, also willkürlich verteilten, ungerichteten Poren 2 noch gerichtete Poren 3, die sich in seiner Längsrichtung erstrecken und vom kalten Steinende bis zu dem dem Ofeninneren bzw. Gefässinneren zugewandten Steinende, dem heissen Steinende, durchgehen. Der Gasspülstein 1 ist an seinen Seitenflächen von einem Blechmantel 5 umhüllt und weist an seinem vom Ofeninneren bzw. Gefässinneren abliegenden, kalten Steinende 4 einen Blechboden 6 auf. Der Blechmantel 5, der sich über die gesamte Seitenlänge des Gasspülsteines 1 erstrecken oder aber nur die Seitenflächen des in der Zeichnung wiedergegebenen kalten Steinendteils bedecken kann, und der Blechboden 6 bewirken, dass das gesamte zugeführte Spülgas in den Gasspülstein 1 eindringt und ein Abströmen dieses Gases nach aussen verhindert wird. Zwischen dem kalten Steinende 4 und dem Blechboden 6 kann ein spaltförmiger Zwischenraum 7, der als Gaszuführungsspalt bezeichnet werden kann, vorhanden sein, um eine gleichmässige Verteilung des zugeführten Gasstromes über den Steinquerschnitt zu gewährleisten.The invention is explained in more detail with reference to the drawing, in which a gas purge provided with a sheet metal jacket is shown schematically in partial section stone is shown with a gas supply pipe and a surrounding protective pipe. The gas purging plug designated 1 in the drawing can have any shape, for example the shape of a cuboid or a conical shape as shown, and can be arranged, for example, in a perforated brick (not shown). The refractory material from which the stone 1 is constructed is also irrelevant to the present invention and can be selected in accordance with the intended use of the stone. In addition to normal, that is to say randomly distributed, undirected pores 2, the sink 1 shown also has directed pores 3 which extend in its longitudinal direction and pass from the cold stone end to the stone end facing the interior of the furnace or the interior of the vessel, the hot stone end. The gas purging stone 1 is encased on its side surfaces by a sheet metal jacket 5 and has a sheet metal base 6 on its cold stone end 4 lying away from the inside of the furnace or inside of the vessel. The sheet metal jacket 5, which extends over the entire side length of the gas purging plug 1 or can only cover the side faces of the cold stone end part shown in the drawing, and the sheet metal base 6 cause the entire supplied purging gas to penetrate the gas purging plug 1 and an outflow of this gas to the outside is prevented. A gap-shaped intermediate space 7, which can be referred to as a gas supply gap, can be present between the cold stone end 4 and the sheet metal base 6, in order to ensure a uniform distribution of the gas flow supplied over the stone cross-section.

Das kalte Steinende 4 bzw. der gegebenenfalls vorhandene Blechboden 6 ist mit einem Gaszuführungsrohr 8 verbunden, durch welches das gewünschte Spülgas oder Spülmedium dem Gasspülstein 1 zugeführt wird. Im Inneren dieses Gaszuführungsrohres 8 und zentrisch sich in dessen Längsrichtung erstreckend ist ein voll ausgebildeter Metallkern 9, in der Regel ein Stahlkern, vorzugsweise ein Rundstahl, mit einer ihn schraubenlinienförmig umgebenden Wendel 10 aus Metall, gewöhnlich ebenfalls aus Stahl, angeordnet. Diese Wendel 10, die zweckmässig aus Stahldraht besteht und um den Metallkern gewickelt ist, ist an dem Metallkern 9 auf geeignete Weise befestigt, z. B. durch Schweissung (bei 11 ) oder durch blosses federndes Umfassen, und liegt an der Innenwand des Gaszuführungsrohres 8 an. Das Spülmedium strömt durch den zwischen dem Metallkern 9 und der Innenwand des Gaszuführungsrohres 8 verbleibenden Zwischenraum zum Gasspülstein 1. Der Metallkern 9 seinerseits ist am Gaszuführungsrohr 8 befestigt (bei 12), beispielsweise durch Anschweissen oder mit Hilfe von Schrauben oder Bolzen, die von aussen her durch die Wand des Gaszuführungsrohres 8 in dessen Inneres gehen.The cold stone end 4 or the sheet metal base 6, if present, is connected to a gas feed pipe 8, through which the desired flushing gas or flushing medium is supplied to the gas flushing stone 1. A fully formed metal core 9, usually a steel core, preferably a round steel, with a helical coil 10 made of metal, usually also made of steel, is arranged inside this gas supply pipe 8 and extending centrally in the longitudinal direction thereof. This coil 10, which suitably consists of steel wire and is wound around the metal core, is attached to the metal core 9 in a suitable manner, for. B. by welding (at 11) or by sheer resilient embracing, and lies on the inner wall of the gas supply pipe 8. The purging medium flows through the space remaining between the metal core 9 and the inner wall of the gas supply pipe 8 to the gas purging plug 1. The metal core 9 is in turn attached to the gas supply pipe 8 (at 12), for example by welding or with the aid of screws or bolts, which come from outside go through the wall of the gas supply pipe 8 inside.

Der Metallkern 9 stellt zusammen mit der Wendel 10 eine wirksame Durchbruchssicherung dar, denn es ist verständlich, dass flüssiges Metall, das gegebenenfalls durch den Gasspülstein 1 in das Gaszuführungsrohr 8 durchgebrochen ist, in diesem Rohr durch den Metallkern 9 und die an die Innenwand dieses Rohres anliegende Wendel 10 gezwungen wird, mehrmals um den Metallkern herumzufliessen, wodurch es abgekühlt und in Kürze zum Erstarren gebracht wird.The metal core 9 together with the helix 10 represents an effective breakthrough protection, because it is understandable that liquid metal, which may have broken through the gas purging plug 1 into the gas supply pipe 8, in this pipe through the metal core 9 and to the inner wall of this pipe adjacent helix 10 is forced to flow around the metal core several times, whereby it is cooled and soon solidified.

Gewünschtenfalls kann das Gaszuführungsrohr 8 zumindest in seinem an das kalte Steinende 4 anschliessenden Teil konzentrisch von einem Schutzrohr 13 umgeben sein, das mit einer feuerfesten Masse 14, insbesondere einer Giessmasse, gefüllt ist. Dieses Schutzrohr 13 mit der feuerfesten Masse 14 verhindert eine weitere Ausbreitung eines eventuellen Durchbruches von flüssigem Metall durch die Wandung des Gaszuführungsrohres 8.If desired, the gas supply pipe 8 can be concentrically surrounded, at least in its part adjoining the cold stone end 4, by a protective pipe 13 which is filled with a refractory mass 14, in particular a casting compound. This protective tube 13 with the refractory mass 14 prevents further spread of a possible breakthrough of liquid metal through the wall of the gas supply tube 8.

Claims (2)

1. A gas purge plug for metallurgical furnaces and vessels which at its cold end that is remote from the interior of the furnace or vessel is connected to a gas feed pipe, characterized in that a solid metal core (9) is centrally disposed in the interior of and extends along the gas feed pipe (8) and is surrounded by a helical coil (10) of metal.
2. A gas purge plug according to claim 1, characterized in that at least that portion of the gas feed pipe (8) which adjoins the cold end (4) of the plug is concentrically surrounded by a protecting tube (13), which is filled with a refractory composition (14).
EP85890169A 1984-09-18 1985-07-30 Gas flushing plug for metallurgical furnaces and vessels Expired EP0181853B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2962/84 1984-09-18
AT0296284A AT383617B (en) 1984-09-18 1984-09-18 GAS PURGE FOR METALLURGICAL OVENS AND VESSELS

Publications (2)

Publication Number Publication Date
EP0181853A1 EP0181853A1 (en) 1986-05-21
EP0181853B1 true EP0181853B1 (en) 1988-01-27

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EP85890169A Expired EP0181853B1 (en) 1984-09-18 1985-07-30 Gas flushing plug for metallurgical furnaces and vessels

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US (1) US4657226A (en)
EP (1) EP0181853B1 (en)
JP (1) JPS6173811A (en)
AT (1) AT383617B (en)
CA (1) CA1257091A (en)
DE (1) DE3561516D1 (en)
ES (1) ES296151Y (en)

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DE3833503A1 (en) * 1988-10-01 1990-04-05 Didier Werke Ag GASSPUELSTEIN
DE3833506A1 (en) * 1988-10-01 1990-04-05 Didier Werke Ag DEVICE FOR INJECTING A REPAIR SIZE ONTO A HOLE STONE
DE3833502A1 (en) * 1988-10-01 1990-04-05 Didier Werke Ag GASSPUELSTEIN
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US5104097A (en) * 1990-09-14 1992-04-14 Martin & Pagenstecher Gmbha Gas stir plugs with slots and method of making the same
US5249778A (en) * 1992-04-14 1993-10-05 Dolomitwerke Gmbh Gas stir plug device with visual wear indicator
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JP2011194457A (en) * 2010-03-23 2011-10-06 Kurosaki Harima Corp Installation structure of plug for gas blowing
CN103470869B (en) * 2013-09-04 2015-06-17 贵州师范大学 Steel-shell combined-flow steel pipe and production method thereof
CN107385153B (en) * 2017-09-05 2022-09-20 武汉科技大学 Method for manufacturing air brick capable of stirring motion state of metal melt in metallurgical furnace into spiral flow

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Also Published As

Publication number Publication date
ATA296284A (en) 1986-12-15
EP0181853A1 (en) 1986-05-21
ES296151U (en) 1987-10-16
DE3561516D1 (en) 1988-03-03
JPS6173811A (en) 1986-04-16
AT383617B (en) 1987-07-27
US4657226A (en) 1987-04-14
ES296151Y (en) 1988-04-16
CA1257091A (en) 1989-07-11

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