EP0224657B1 - Gas-flushing installation for melt containers - Google Patents

Gas-flushing installation for melt containers Download PDF

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Publication number
EP0224657B1
EP0224657B1 EP86111871A EP86111871A EP0224657B1 EP 0224657 B1 EP0224657 B1 EP 0224657B1 EP 86111871 A EP86111871 A EP 86111871A EP 86111871 A EP86111871 A EP 86111871A EP 0224657 B1 EP0224657 B1 EP 0224657B1
Authority
EP
European Patent Office
Prior art keywords
gas
gas flushing
scavenging
scavenging block
block
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
EP86111871A
Other languages
German (de)
French (fr)
Other versions
EP0224657A1 (en
Inventor
Manfred Winkelmann
Hans Rothfuss
Udo Muschner
Karl Heinz Schmitt
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.)
Didier Werke AG
Original Assignee
Didier Werke 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 Didier Werke AG filed Critical Didier Werke AG
Priority to AT86111871T priority Critical patent/ATE44771T1/en
Publication of EP0224657A1 publication Critical patent/EP0224657A1/en
Application granted granted Critical
Publication of EP0224657B1 publication Critical patent/EP0224657B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the invention relates to a gas purging device for melt containers, in particular in induction furnaces, with a gas purging cone, the smaller top surface of which faces the melt and the larger base surface of which stands up.
  • GB-A-2 150 868 is also to be mentioned as prior art, in which a gas purging device of the type mentioned above is described.
  • a gas purging device of the type mentioned above is described.
  • an inert material due to the penetration of melt when the upper plug wears out is arranged under an upper gas purging plug and a lower gas purging plug is arranged beneath it.
  • the gas purging process is interrupted and both plugs are replaced.
  • the object of the invention is to propose a gas purging device with a purging option secured during the operating phase, the gas purging cone, which is primarily exposed to wear, being easily replaceable and the lower gas purging cone being reusable.
  • the above object is achieved with a gas purging device, a second, lower gas purging cone standing under the said first, upper gas purging cone, the top surface of which is smaller than the bottom surface of the first gas purging cone, and that the first, upper gas purging cone with its, the top surface of the second Gasixiekels projecting ring zone of the bottom surface stands on a stone in which the second gas purging cone is stored.
  • the upper gas purging cone is easily replaceable in this arrangement. It does not burden the lower gas purging cone.
  • Favorable purging conditions are present during operation, since the cross section of the upper gas purging cone does not taper immediately as seen from the top surface of the lower gas purging cone, but initially widens.
  • the gas purging device according to the invention can be used, for example, in the aluminum industry, in gray cast iron production, in steel ladles, pig iron transport vessels, continuous casting distributors or converters.
  • a first, upper gas purging cone 3 without a sheet metal jacket is inserted into the floor lining 1 of a melt container 2. Its head surface 3 'protrudes into the melt container 2.
  • a recess 5 is provided on its bottom surface 3 ", which is enclosed by an annular zone 5 of the bottom surface 3".
  • a square stone 6 sits in the floor lining 1, into which a second, lower gas purging cone 7 is walled by means of a gas-tight mortar 8.
  • the ring zone 5 sits on the stone 6 in the vicinity of the top surface 7 '.
  • the head surface 7 ' protrudes into the recess 4 without resting on the gas purge cone 3.
  • a pressure distribution chamber 9 lies between the head surface 7 'and the gas purge cone 3.
  • the head surfaces 7' can be of different sizes.
  • the gas flushing cone 7 sits with its lower region in a sheet metal jacket 10, which holds a base plate 11.
  • a gas distribution chamber 12 is formed on the bottom surface 7 ", from which capillaries 13 lead to the top surface 7 '.
  • the bottom surface 7" and the bottom surface 3 " can be of different sizes.
  • the stone 6 is attached to the gas flushing cone 7 on this. Eyelets 16 are provided for transport. This creates an easy-to-use unit consisting of the carrier 15, the stone 6 and the gas flushing cone 7.
  • a gas source with a flow meter, which indicates wear of the porous gas flushing cone 3, is connected to the gas supply line 14.
  • a secure gas flow is ensured by the arrangement described. If the gas purging cone 3 is to be replaced due to wear, the unit 15, 6, 7 is removed for this purpose and a fresh gas purging cone 3 is inserted. The gas purging cone 7 is practically not subject to wear.
  • the gas purging cone 3 can also be fastened with its ring zone 5 onto the stone 6 by means of a gas-tight mortar layer before the assembly is inserted into the floor brick 1.
  • the gas purge cone 3 Since the gas purge cone 3 is used without a sheet metal jacket, there is no need to fear electrical flashovers in an induction oven.
  • the gas purge cone 3 has an exclusively ceramic material contact with the melt.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Details (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Noodles (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

A gas scavenging apparatus for a metallurgical vessel containing molten metal includes a frusto-conical refractory inner scavenging block inserted in the refractory lining of the vessel and having a smaller end surface facing the molten metal and a larger base end directed away from the molten metal. A frusto-conical refractory outer scavenging block is embedded within a mounting brick positioned outwardly of the inner scavenging block. The outer scavenging block has a smaller end surface smaller than and facing the larger base end of the inner scavenging block and a larger base end directed away from the inner scavenging block. The larger base end of the inner scavenging block has an annular end surface extending generally radially outwardly away from the smaller end surface of the outer scavenging block and resting on the mounting brick. Scavenging gas is passed through the outer scavenging block and then through the inner scavenging block to the molten metal. The inner scavenging block does not load the outer scavenging block. The inner scavenging block may be replaced when necessary due to erosion by the molten metal, but the outer scavenging block does not require replacement.

Description

Die Erfindung betrifft eine Gasspüleinrichtung für Schmelzenbehälter, insbesondere bei Induktionsöfen, mit einem Gasspülkegel, dessen kleinere Kopffläche der Schmelze zugewandt ist und dessen größere Bodenfläche aufsteht.The invention relates to a gas purging device for melt containers, in particular in induction furnaces, with a gas purging cone, the smaller top surface of which faces the melt and the larger base surface of which stands up.

Eine derartige Gasspüleinrichtung ist in der Zeitschrift « Gießerei 72 », 1985, Nr. 6, Seiten 133 bis 138 beschrieben. Dort steht der Gasspülkegel auf einer groben Stampfmasse auf. Soll der Gasspülkegel ausgetauscht werden, dann muß auch die Stampfmasse ersetzt werden.Such a gas purging device is described in the magazine "Foundry 72", 1985, No. 6, pages 133 to 138. There the gas purge cone stands on a coarse ramming mass. If the gas flushing cone is to be replaced, the ramming compound must also be replaced.

In der DE-OS 32 50 097 ist beim Gasspülstein Füllmaterial vorgesehen, das einen Schmelzpunkt unterhalb der Temperatur der Schmelze aufweist. Tritt Schmelze an das Füllmaterial, bildet sich ein Verschluß, der einen Schmelzendurchbruch verhindert. Dadurch ist allerdings auch der Gasspülvorgang unterbrochen.In DE-OS 32 50 097 filler material is provided for the gas purging plug, which has a melting point below the temperature of the melt. If melt occurs on the filling material, a closure is formed which prevents melt breakthrough. However, this also interrupts the gas purging process.

Weiterhin ist als Stand der Technik die GB-A- 2 150 868 zu nennen, in der eine Gasspüleinrichtung der oben genannten Art beschrieben ist. Hierbei sind unter einem oberen Gasspülstopfen ein durch Eindringen von Schmelze bei Verschleiß des oberen Stopfens sintemdes Material und unter diesem ein unterer Gasspülstopfen angeordnet. Im Verschleißfall ist der Gasspülvorgang unterbrochen und beide Stopfen werden ausgetauscht.GB-A-2 150 868 is also to be mentioned as prior art, in which a gas purging device of the type mentioned above is described. In this case, an inert material due to the penetration of melt when the upper plug wears out is arranged under an upper gas purging plug and a lower gas purging plug is arranged beneath it. In the event of wear, the gas purging process is interrupted and both plugs are replaced.

Aufgabe der Erfindung ist es, eine Gasspüleinrichtung mit während der Betriebsphase gesicherter Spülmöglichkeit vorzuschlagen, wobei der dem Verschleiß in erster Linie ausgesetzte Gasspülkegel leicht ersetzbar und der untere Gasspülkegel wiederverwendbar ist.The object of the invention is to propose a gas purging device with a purging option secured during the operating phase, the gas purging cone, which is primarily exposed to wear, being easily replaceable and the lower gas purging cone being reusable.

Erfindungsgemäß ist obige Aufgabe mit einer Gasspüleinrichtung gelöst, wobei unter dem genannten, ersten, oberen Gasspülkegel ein zweiter, unterer Gasspülkegel steht, dessen Kopffläche kleiner als die Bodenfläche des ersten Gasspülkegels ist, und daß der erste, obere Gasspülkegel mit seiner, die Kopffläche des zweiten Gasspülkegels überragenden Ringzone der Bodenfläche auf einem Stein aufsteht, in dem der zweite Gasspülkegel gelagert ist.According to the invention, the above object is achieved with a gas purging device, a second, lower gas purging cone standing under the said first, upper gas purging cone, the top surface of which is smaller than the bottom surface of the first gas purging cone, and that the first, upper gas purging cone with its, the top surface of the second Gasspülkels projecting ring zone of the bottom surface stands on a stone in which the second gas purging cone is stored.

Der obere Gasspülkegel ist bei dieser Anordnung leicht austauschbar. Er belastet den unteren Gasspülkegel nicht. Im Betrieb sind günstige Spülverhältnisse gegeben, da der Querschnitt des oberen Gasspülkegels sich nicht von der Kopffläche des unteren Gasspülkegels gesehen unmittelbar verjüngt, sondern zunächst erweitert.The upper gas purging cone is easily replaceable in this arrangement. It does not burden the lower gas purging cone. Favorable purging conditions are present during operation, since the cross section of the upper gas purging cone does not taper immediately as seen from the top surface of the lower gas purging cone, but initially widens.

Die erfindungsgemäße Gasspüleinrichtung ist beispielsweise in der Aluminiumindustrie, bei der Graugußfertigung, bei Stahlgießpfannen, Roheisentransportgefäßen, Stranggußverteilern oder Konvertern einsetzbar.The gas purging device according to the invention can be used, for example, in the aluminum industry, in gray cast iron production, in steel ladles, pig iron transport vessels, continuous casting distributors or converters.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen und der folgenden Beschreibung eines Ausführungsbeispiels. Die Zeichnung zeigt eine Gasspüleinrichtung im Schnitt.Advantageous refinements of the invention result from the subclaims and the following description of an exemplary embodiment. The drawing shows a gas purging device in section.

In die Bodenausmauerung 1 eines Schmelzenbehälters 2 ist ein erster, oberer Gasspülkegel 3 ohne Blechmantel eingesetzt. Seine Kopffläche 3' ragt in den Schmelzenbehälter 2. An seiner Bodenfläche 3" ist eine Vertiefung 5 vorgesehen, die von einer Ringzone 5 der Bodenfläche 3" umschlossen ist.A first, upper gas purging cone 3 without a sheet metal jacket is inserted into the floor lining 1 of a melt container 2. Its head surface 3 'protrudes into the melt container 2. A recess 5 is provided on its bottom surface 3 ", which is enclosed by an annular zone 5 of the bottom surface 3".

Unter dem Gasspülkegel 3 sitzt in der Bodenausmauerung 1 ein quadratischer Stein 6, in den ein zweiter, unterer Gasspülkegel 7 mittels eines gasdichten Mörtels 8 eingemauert ist. Die Ringzone 5 sitzt in der Umgebung der Kopffläche 7' auf dem Stein 6 auf. Die Kopffläche 7' ragt in die Vertiefung 4, ohne am Gasspülkegel 3 anzuliegen. Zwischen der Kopffläche 7' und dem Gasspülkegel 3 liegt eine Druckverteilkammer 9. Die Kopfflächen 7' können unterschiedlich groß sein.Under the gas purging cone 3, a square stone 6 sits in the floor lining 1, into which a second, lower gas purging cone 7 is walled by means of a gas-tight mortar 8. The ring zone 5 sits on the stone 6 in the vicinity of the top surface 7 '. The head surface 7 'protrudes into the recess 4 without resting on the gas purge cone 3. A pressure distribution chamber 9 lies between the head surface 7 'and the gas purge cone 3. The head surfaces 7' can be of different sizes.

Der Gasspülkegel 7 sitzt mit seinem unteren Bereich in einem Blechmantel 10, der eine Bodenplatte 11 hält. An der Bodenfläche 7" ist eine Gasverteilkammer 12 gebildet, von der aus Kapillare 13 zur Kopffläche 7' führen. Die Bodenfläche 7" und die Bodenfläche 3" können verschieden groß sein.The gas flushing cone 7 sits with its lower region in a sheet metal jacket 10, which holds a base plate 11. A gas distribution chamber 12 is formed on the bottom surface 7 ", from which capillaries 13 lead to the top surface 7 '. The bottom surface 7" and the bottom surface 3 "can be of different sizes.

In die Gasverteilkammer 12 mündet eine Gaszuleitung 15, die in einem Träger 15 verlegt ist. An diesem ist der Stein 6 mit dem Gasspülkegel 7 befestigt. Zum Transport sind ösen 16 vorgesehen. Es ist dadurch eine einfach hantierbare Baueinheit, bestehend aus dem Träger 15, dem Stein 6 und dem Gasspülkegel 7 geschaffen.A gas feed line 15, which is laid in a carrier 15, opens into the gas distribution chamber 12. The stone 6 is attached to the gas flushing cone 7 on this. Eyelets 16 are provided for transport. This creates an easy-to-use unit consisting of the carrier 15, the stone 6 and the gas flushing cone 7.

An die Gaszuleitung 14 ist eine Gasquelle mit einem Durchflußmengenmesser angeschlossen, der einen Verschleiß des porösen Gasspülkegels 3 anzeigt.A gas source with a flow meter, which indicates wear of the porous gas flushing cone 3, is connected to the gas supply line 14.

Durch die beschriebene Anordnung ist eine gesicherte Gasführung gewährleistet. Soll der Gasspülkegel 3 wegen Verschleiß ausgetauscht werden, dann wird hierfür die Baueinheit 15, 6, 7 abgenommen und ein frischer Gasspülkegel 3 eingesetzt. Der Gasspülkegel 7 ist praktisch keinem Verschleiß unterworfen. Der Gasspülkegel 3 kann auch vor dem Einsetzen der Baueinheit in die Bodenausmauerung 1 mit seiner Ringzone 5 auf den Stein 6 mittels einer gasdichten Mörtelschicht befestigt werden.A secure gas flow is ensured by the arrangement described. If the gas purging cone 3 is to be replaced due to wear, the unit 15, 6, 7 is removed for this purpose and a fresh gas purging cone 3 is inserted. The gas purging cone 7 is practically not subject to wear. The gas purging cone 3 can also be fastened with its ring zone 5 onto the stone 6 by means of a gas-tight mortar layer before the assembly is inserted into the floor brick 1.

Da der Gasspülkegel 3 ohne Blechmantel eingesetzt ist, sind - bei einem Induktionsofen - elektrische Überschläge nicht zu befürchten. Der Gasspülkegel 3 hat einen ausschließlich keramischen Materialkontakt mit der Schmelze.Since the gas purge cone 3 is used without a sheet metal jacket, there is no need to fear electrical flashovers in an induction oven. The gas purge cone 3 has an exclusively ceramic material contact with the melt.

Claims (5)

1. Gas flushing plug for a melt container, particularly for induction furnaces, with a gas flushing plug whose smaller top surface is directed towards the melt and which rests on its larger bottom surface, wherein the beneath the said first, upper gas flushing plug (3) there is a second, lower gas flushing plug (7) whose upper surface (7') is smaller than the bottom surface (3") of the first gas flushing plug (3) and that the first, upper gas flushing plug (3) rests with an annular region (5) bf the bottom surface (3'1 which projects beyond the upper surface (7') of the second gas flushing plug (7) on a brick (6) in which the second gas flushing plug (7) is mounted.
2. Gas flushing device as claimed in claim 1, characterised in that there is an empty pressure distribution chamber (9) between the upper surface (7') of the second gas flushing plug (7) and the bottom surface (3") of the first gas flushing plug (3).
3. Gas flushing device as claimed in claim 1 or 2, characterised in that on its bottom surface (3") the gas flushing plug (3) has a central recess (4) into which the upper surface (7') of the second gas flushing plug (7) projects.
4. Gas flushing device as claimed in one of the preceding claims, characterised in that the second gas flushing plug (7) is fixed in the brick (6) by means of a gas-tight mortar (8).
5. Gas flushing device as claimed in one of the preceding claims, characterised in that the first gas flushing plug (3) comprises a porous material and the second gas flushing plug (7) has capillary passages (13).
EP86111871A 1985-12-04 1986-08-27 Gas-flushing installation for melt containers Expired EP0224657B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111871T ATE44771T1 (en) 1985-12-04 1986-08-27 GAS FLUSHING DEVICE FOR MELTING CONTAINERS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3542781 1985-12-04
DE3542781 1985-12-04

Publications (2)

Publication Number Publication Date
EP0224657A1 EP0224657A1 (en) 1987-06-10
EP0224657B1 true EP0224657B1 (en) 1989-07-19

Family

ID=6287536

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111871A Expired EP0224657B1 (en) 1985-12-04 1986-08-27 Gas-flushing installation for melt containers

Country Status (10)

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US (1) US4695043A (en)
EP (1) EP0224657B1 (en)
JP (1) JPH0730383B2 (en)
CN (1) CN1025051C (en)
AT (1) ATE44771T1 (en)
BR (1) BR8605843A (en)
CA (1) CA1297144C (en)
DE (1) DE3664485D1 (en)
NO (1) NO164847C (en)
ZA (1) ZA868077B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4840354A (en) * 1988-06-22 1989-06-20 Labate M D Stirring brick with shaped gas volume control openings
DE3830871C1 (en) * 1988-09-10 1989-11-02 Radex-Heraklith Industriebeteiligungs Ag, Wien, At
FR2644566B1 (en) * 1989-03-15 1991-06-21 Air Liquide ELECTRIC ARC FURNACE AND SCRAP MELTING METHOD
DE4012952C2 (en) * 1990-04-24 1995-03-23 Didier Werke Ag Gas purging device on a metallurgical vessel
US5200135A (en) * 1991-07-22 1993-04-06 Vargas Gutierrez Gregorio Method to improve the service life of gas injection devices used to introduce a gas into molten metal
US6116079A (en) * 1999-01-05 2000-09-12 Asarco Incorporated Liquid copper hydrogen sample probe
US6250955B1 (en) * 1999-12-17 2001-06-26 David Archuleta Pigtailed scotchcast assembly

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE635868A (en) * 1962-08-07
US3610602A (en) * 1969-10-14 1971-10-05 United States Steel Corp Gas-permeable refractory plug and method
US3834685A (en) * 1973-09-24 1974-09-10 Allegheny Ludlum Ind Inc Apparatus for injecting fluids into molten metals
SE392479B (en) * 1974-03-20 1977-03-28 Asea Ab FORMA AT METALLURGIC CONVERTERS AND MELTING OVEN
JPS54100904U (en) * 1977-12-26 1979-07-16
DE3003884C2 (en) * 1980-02-02 1983-02-10 Didier-Werke Ag, 6200 Wiesbaden Method for installing and replacing a gas-permeable refractory insert in the wall of a container containing a melt for introducing gases into the container and arrangement for carrying out this method
WO1983003427A1 (en) * 1982-03-29 1983-03-29 Miyawaki, Yoshiharu Bottom blowing gas nozzle in molten metal refining furnace and method of melting steel using the same nozzle
GB8329038D0 (en) * 1983-10-31 1983-11-30 Morgan Refractories Ltd Porous plug assemblies

Also Published As

Publication number Publication date
NO164847C (en) 1990-11-21
US4695043A (en) 1987-09-22
ZA868077B (en) 1987-06-24
CN1025051C (en) 1994-06-15
CA1297144C (en) 1992-03-10
ATE44771T1 (en) 1989-08-15
EP0224657A1 (en) 1987-06-10
NO164847B (en) 1990-08-13
CN86106459A (en) 1988-04-06
NO864855L (en) 1987-06-05
JPH0730383B2 (en) 1995-04-05
JPS62136517A (en) 1987-06-19
NO864855D0 (en) 1986-12-03
DE3664485D1 (en) 1989-08-24
BR8605843A (en) 1987-08-25

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