EP0379647B1 - Refractory nozzle and induction coil therefor - Google Patents
Refractory nozzle and induction coil therefor Download PDFInfo
- Publication number
- EP0379647B1 EP0379647B1 EP89119300A EP89119300A EP0379647B1 EP 0379647 B1 EP0379647 B1 EP 0379647B1 EP 89119300 A EP89119300 A EP 89119300A EP 89119300 A EP89119300 A EP 89119300A EP 0379647 B1 EP0379647 B1 EP 0379647B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- refractory
- electrically conductive
- metal melt
- primary coil
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D39/00—Equipment for supplying molten metal in rations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/60—Pouring-nozzles with heating or cooling means
-
- 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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/367—Coil arrangements for melting furnaces
Definitions
- the invention relates to a refractory connection which, with an inner wall, encloses a flow channel between a vessel intended for receiving molten metal and an extraction device for the molten metal, in particular a fireproof spout for molten steel, the inner wall being wholly or partly made at at least the liquidus temperature the molten metal is electrically conductive ceramic material which can be inductively heated by means of a primary coil which can be operated by a current source, or has such a material.
- a refractory casting sleeve for a metallurgical vessel which is from an induction coil is surrounded, the axis of which coincides with the axis of the flow channel.
- the coil can be connected to a current source with a frequency between 3 and 50 KHz in order to heat the surface temperature of the casting sleeve essentially to the temperature of the molten metal by means of induction.
- the pouring sleeve can be made of zirconium oxide or another suitable refractory material.
- a vacuum or inert gas furnace for high temperatures with heating coil and frequency generator or converter is known, in which the material to be heated is arranged in a gapite coil serving as heating inductor and radiator and one made of carbon or graphite existing insulation layer surrounds the graphite coil.
- the coil surrounds at a radial distance a rod-shaped body which is inserted into the furnace and is to be heated and is carried by means of spacers.
- the object of the invention is to provide a refractory connection of the type mentioned, in which the freezing of the molten metal and the smearing due to undesirable deposits in the flow channel can be reliably avoided with low energy losses.
- the primary coil is part of the inner wall or embedded in a surrounding thermally insulating material.
- the required electrical conductivity of the ceramic material should expediently begin at least at the temperature to which the inner wall is already heated by the molten metal flowing through the connection, and above that at least to the liquidus temperature of the molten metal.
- the solution according to the invention also eliminates, for example, the disadvantages of a device known from EP-B-0 155 575 for regulating the flow of a molten metal during continuous casting, in which an electromagnetic coil is arranged concentrically around the pouring tube in order to prevent electrical stress the coil an electromagnetic constriction of the pouring stream and thus to achieve a reduced flow cross-section.
- a certain inductive heating of the molten metal can also occur in the area of action of the coil, which is arranged only a short distance around the pouring tube, but freezing of the molten metal and undesired deposition of, for example, clay on the inner surface of the pouring wall cannot be avoided there.
- an induction coil in the inner wall or in an insulation surrounding it, e.g. designed as a spout refractory connection, the inner wall of the connection is even inductively heated to the required temperature in an economical manner, or at such a temperature at which the side effects mentioned are avoided.
- connection does not consist of the electrically conductive ceramic material over its entire length, but only over a longitudinal section of its inner wall, and if this longitudinal section has the primary coil acting as an induction coil.
- this longitudinal section may also be expedient to have two or more such longitudinal sections spaced apart from one another in the direction of flow, so that the metal melt is repeatedly brought up to the required temperature at its flow through the connection, at which the metal melt freezes and a deposit of e.g. Alumina is prevented.
- an electrically conductive, inductively heatable ceramic material in the context of the invention, in a manner known per se, there is in particular one which is or has ZrO2.
- Such materials are particularly suitable for embedding the induction coil and have excellent erosion and corrosion resistance against flowing molten metal.
- the ZrO2 is stabilized by means of Y2O3, CaO and / or MgO.
- the primary coil itself can also consist of ceramic material, which is particularly advantageous if cooling for energy reasons is to be dispensed with.
- the performance of the primary coil can be regulated, the heating temperature of the molten metal can be changed in order to avoid freezing and / or to prevent or remove deposits from the molten metal.
- the frequency range should expediently be in the order of 3 to 10 MHz.
- the invention also relates to a novel induction coil having at least one primary coil for heating the electrically conductive, ceramic material of a refractory connection of the type previously discussed. It is distinguished according to the invention in that its primary coil consists of electrically conductive ceramic material. This achieves the advantage of the induction device to be able to operate permanently in an economical manner. Cooling, as is the case with metal coils, is not necessary.
- Such an induction coil can be used according to a further proposal of the invention for inductively heating the electrically conductive material of the said refractory connections between a vessel intended for holding molten metal and a withdrawal device, such as refractory spouts of the type described above.
- the primary coil is integrated into the inner wall or its thermal insulation.
- the connection designed as a spout for a continuous casting installation according to FIG. 1 has an inner wall 1 which encloses a flow channel 3. At a distance, the inner wall 1, in this case over its entire length L, is surrounded by a primary coil 4. The primary coil 4 is in turn surrounded by a metal shield 5 against stray radiation, which can be cooled. The space 7 delimited by the shield 5 and the outer surface 6 of the inner wall 1 is filled with a thermally insulating material, for example a ZrO 2 granulate.
- the primary coil 4 can be connected to a frequency-dependent current source with controllable power.
- the inner surface 2 of the inner wall 1 delimiting the flow channel 3 can be heated up to the required extent in a controlled manner or can be kept at the desired temperature after the wall has been heated by the molten metal flowing through it, in order to avoid freezing of the molten metal.
- the inner surface 2 can have a layer or casing that is electrically insulating from the molten steel.
- the primary coil 4 also extends over the entire length L of the spout inner wall 1, in contrast to FIG. 1, however, it is embedded in the stronger spout inner wall 1 itself instead of in the insulating material.
- the possibly cooled metal shield 5 lies here directly on the outer surface 6 of the inner wall 1.
- the inner surface 2 can also have a layer or casing that is electrically insulating from the molten steel.
- the primary coil 4 can be arranged such that its inducing magnetic field is directed parallel or perpendicular to the axis of the connection.
- the primary coil 4 itself can consist of electrically conductive ceramic material, so that cooling of the primary coil 4 is unnecessary.
- An arrangement equipped with such a primary coil 4 can also be used for other heating purposes.
Abstract
Description
Die Erfindung bezieht sich auf eine feuerfeste Verbindung, welche mit einer Innenwandung einen Druchflußkanal zwischen einem für die Aufnahme von Metallschmelze bestimmten Gefäß und einer Abszugsvorrichtung für die Metallschmelze umschließt, insbesondere feuerfesten Ausguß für Stahlschmelze, wobei die Innenwandung ganz oder teilweise aus bei mindestens Liquidus-Temperatur der Metallschmelze elektrisch leitfähigem, mittels einer von einer Stromquelle betreibbaren Primärspule induktiv aufheizbaren keramischen Material besteht bzw. ein solches Material aufweist.The invention relates to a refractory connection which, with an inner wall, encloses a flow channel between a vessel intended for receiving molten metal and an extraction device for the molten metal, in particular a fireproof spout for molten steel, the inner wall being wholly or partly made at at least the liquidus temperature the molten metal is electrically conductive ceramic material which can be inductively heated by means of a primary coil which can be operated by a current source, or has such a material.
Bei derartigen Verbindungen besteht insbesondere dann, wenn es um das Stranggießen von Metallschmelze, z.B. Stahlschmelze, in Kokillen für dünne Brammen geht, wegen der verhältnismäßig geringen Strömungsquerschnitte das Problem des Einfrierens der Metallschmelze und des Zuschmierens aufgrund unerwünschter Ablagerungen, wie Tonerdeablagerungen, aus der Metallschmelze.Such connections exist particularly when it comes to the continuous casting of molten metal, e.g. Steel melt, in molds for thin slabs, because of the relatively small flow cross sections, the problem of freezing of the metal melt and smearing due to undesirable deposits, such as alumina deposits, from the metal melt.
Aus der FR-A-1 525 154 ist eine feuerfeste Gießhülse für ein metallurgisches Gefäß bekannt, welches von einer Induktionsspule umgeben ist, deren Achse mit der Achse des Durchflußkanals zusammenfällt. Die Spule ist an eine Stromquelle mit einer Frequenz zwischen 3 und 50 KHz anschließbar, um die Oberflächentemperatur der Gießhülse mittels Induktion im wesentlichen auf die Temperatur der Metallschmelze zu erhitzen. Die Gießhülse kann aus Zirkonoxid oder einem anderen geeigneten Feuerfestmaterial bestehen.From FR-A-1 525 154 a refractory casting sleeve for a metallurgical vessel is known, which is from an induction coil is surrounded, the axis of which coincides with the axis of the flow channel. The coil can be connected to a current source with a frequency between 3 and 50 KHz in order to heat the surface temperature of the casting sleeve essentially to the temperature of the molten metal by means of induction. The pouring sleeve can be made of zirconium oxide or another suitable refractory material.
Aus der DE-A-2 234 127 ist ein Vakuum- oder Schutzgasofen für hohe Temperaturen mit Heizspule und Frequenzgenerator oder -Umformer bekannt, bei welchem der zu erhitzende Stoff in einer gleichzeitig als Heizinduktor und Strahler dienenden Gaphitspule angeordnet ist und eine aus Kohlenstoff oder Graphit bestehende Isolationsschicht die Graphitspule umgibt. Die Spule umgibt dabei in radialem Abstand einen den in den Ofen eingeführten, mittels Abstandshalter getragenen zu erhitzenden stabförmigen Körper.From DE-A-2 234 127 a vacuum or inert gas furnace for high temperatures with heating coil and frequency generator or converter is known, in which the material to be heated is arranged in a gapite coil serving as heating inductor and radiator and one made of carbon or graphite existing insulation layer surrounds the graphite coil. The coil surrounds at a radial distance a rod-shaped body which is inserted into the furnace and is to be heated and is carried by means of spacers.
Aufgabe der Erfindung ist es, eine feuerfeste Verbindung der eingangs genannten Art zu schaffen, bei welchem bei geringen Energieverlusten das Einfrieren der Metallschmelze und das Zuschmieren aufgrund von unerwünschten Ablagerungen in dem Durchflußkanal zuverlässig vermieden werden kann.The object of the invention is to provide a refractory connection of the type mentioned, in which the freezing of the molten metal and the smearing due to undesirable deposits in the flow channel can be reliably avoided with low energy losses.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Primärspule Bestandteil der Innenwandung bzw. in einem diese umgebenden thermisch isolierenden Material eingebettet ist.This object is achieved in that the primary coil is part of the inner wall or embedded in a surrounding thermally insulating material.
Aufgrund dieser Maßnahme wird unerwünschte Abstrahlung von Energie nach außen wirksam begrenzt, eine gleichmäßige Erwärmung der Innenwandung sichergestellt und ggf. bei Einsatz von thermisch isolierendem Material eine zu rasche Abkühlung der Verbindung verhindert. Die erforderliche elektrische Leitfähigkeit des keramischen Materials sollte zweckmäßigerweise mindestens bereits bei der Temperatur einsetzen, auf welche die Innenwandung von der durch die Verbindung hindurchströmenden Metallschmelze selbst bereits aufgeheizt wird, und darüber wenigstens bis zur Liquidus-Temperatur der Metallschmelze anhalten.Because of this measure, undesired radiation of energy to the outside is effectively limited, uniform heating of the inner wall is ensured and, if necessary, the connection is cooled too quickly when thermally insulating material is used. The required electrical conductivity of the ceramic material should expediently begin at least at the temperature to which the inner wall is already heated by the molten metal flowing through the connection, and above that at least to the liquidus temperature of the molten metal.
Mit der erfindungsgemäßen Lösung werden bspw. auch diejenigen Nachteile, die eine aus der EP-B-0 155 575 bekannten Vorrichtung zur Regelung des Durchflusses einer Metallschmelze beim Stranggießen behoben, bei welcher eine elektromagnetische Spule konzentrisch um das Gießrohr angeordnet ist, um bei elektrischer Beaufschlagung der Spule eine elektromagnetische Einschnürung de Gießstrahles und damit einen reduzierten Durchflußquerschnitt zu erreichen. Bei dieser bekannten Vorrichtung kann zwar auch eine gewisse induktive Erwärmung der Metallschmelze im Wirkungsbereich der nur mit geringem Abstand um das Gießrohr angeordneten Spule eintreten, ein Einfrieren der Metallschmelze und eine unerwünschte Ablagerung von z.B. Tonerde auf der Innenfläche der Ausgußwandung ist dort jedoch nicht zu vermeiden.The solution according to the invention also eliminates, for example, the disadvantages of a device known from EP-B-0 155 575 for regulating the flow of a molten metal during continuous casting, in which an electromagnetic coil is arranged concentrically around the pouring tube in order to prevent electrical stress the coil an electromagnetic constriction of the pouring stream and thus to achieve a reduced flow cross-section. In this known device, a certain inductive heating of the molten metal can also occur in the area of action of the coil, which is arranged only a short distance around the pouring tube, but freezing of the molten metal and undesired deposition of, for example, clay on the inner surface of the pouring wall cannot be avoided there.
Durch die erfindungsgemäße Anwendung einer Induktionsspule in der Innenwandung bzw. in einer diese umgebenden Isolation einer z.B. als Ausguß ausgebildeten feuerfesten Verbindung, wird die Innenwandung der Verbindung auf wirtschaftliche Weise selbst induktiv auf die erforderliche Temperatur aufgeheizt bzw. auf einer solchen gehalten, bei welcher die genannten Begleiterscheinungen vermieden sind.The inventive use of an induction coil in the inner wall or in an insulation surrounding it, e.g. designed as a spout refractory connection, the inner wall of the connection is even inductively heated to the required temperature in an economical manner, or at such a temperature at which the side effects mentioned are avoided.
Unter bestimmten Voraussetzungen reicht es aus, wenn die Verbindung nicht über ihre gesamte Länge, sondern nur über einen Längsabschnitt ihrer Innenwandung aus dem elektrisch leitfähigen keramischen Material besteht oder dieses aufweist und dieser Längsabschnitt die als Induktionsspule wirkende Primärspule aufweist. Bei besonders langen Verbindungen kann es dabei auch zweckmäßig sein, im Abstand voneinander zwei oder mehrere derartiger Längsabschnitte in Strömungsrichtung folgen zu lassen, so daß die Metallschmelze bei ihrem Durchfluß durch die Verbindung immer wieder auf die erforderliche Temperatur gebracht wird, bei welcher ein Einfrieren der Metallschmelze und eine Ablagerung von z.B. Tonerde verhindert wird.Under certain conditions, it is sufficient if the connection does not consist of the electrically conductive ceramic material over its entire length, but only over a longitudinal section of its inner wall, and if this longitudinal section has the primary coil acting as an induction coil. In the case of particularly long connections, it may also be expedient to have two or more such longitudinal sections spaced apart from one another in the direction of flow, so that the metal melt is repeatedly brought up to the required temperature at its flow through the connection, at which the metal melt freezes and a deposit of e.g. Alumina is prevented.
Als elektrisch leitfähiges, induktiv aufheizbares keramisches Material bietet sich im Rahmen der Erfindung in an sich bekannter Weise insbesondere ein solches an, welches ZrO₂ ist oder aufweist. Derartige Materialien eignen sich besonders für die Einbettung der Induktionsspule und weisen einen ausgezeichneten Erosions- und Korrosionswiderstand gegen strömende Metallschmelze auf.As an electrically conductive, inductively heatable ceramic material, in the context of the invention, in a manner known per se, there is in particular one which is or has ZrO₂. Such materials are particularly suitable for embedding the induction coil and have excellent erosion and corrosion resistance against flowing molten metal.
Für eine wirksame thermische Kopplung der elektromagnetischen Primärspule und dem elektrisch leitfähigen, induktiv aufheizbaren keramischen Material ist es von Vorteil, wenn das ZrO₂ mittels Y₂O₃, CaO und/oder MgO stabilisiert ist.For an effective thermal coupling of the electromagnetic primary coil and the electrically conductive, inductively heatable ceramic material, it is advantageous if the ZrO₂ is stabilized by means of Y₂O₃, CaO and / or MgO.
Bei einer besonderen Ausgestaltung der Erfindung kann auch die Primärspule selbst aus keramischem Material bestehen, was insbesondere dann von Vorteil ist, wenn auf eine Kühlung aus Energiegründen verzichtet werden soll.In a special embodiment of the invention, the primary coil itself can also consist of ceramic material, which is particularly advantageous if cooling for energy reasons is to be dispensed with.
Wenn die Primärspule gemäß einer weiteren Ausgestaltung der Erfindung hinsichtlich ihrer Leistung regelbar ist, kann die Aufheiztemperatur der Metallschmelze zur Vermeidung des Einfrierens und/oder zur Verhinderung bzw. Beseitigung von Ablagerungen aus der Metallschmelze verändert werden.If, according to a further embodiment of the invention, the performance of the primary coil can be regulated, the heating temperature of the molten metal can be changed in order to avoid freezing and / or to prevent or remove deposits from the molten metal.
Für den hier vorliegenden Einsatzzweck sollte der Frequenzbereich zweckmäßigerweise in einer Größenordnung von 3 bis 10 MHz liegen.For the intended use here, the frequency range should expediently be in the order of 3 to 10 MHz.
Die Erfindung bezieht sich auch auf eine neuartige, mindestens eine Primärspule aufweisende Induktionsspule zum Aufheizen des elektrisch leitfähigen, keramischen Materials einer feuerfesten Verbindung der zuvor erörterten Art. Sie zeichnet sich erfindungsgemäß dadurch aus, daß ihre Primärspule aus elektrisch leitfähigem keramischen Material besteht. Hierdurch wird der Vorteil erzielt, die Induktionseinrichtung auf wirtschaftliche Weise dauerhaft betreiben zu können. Eine Kühlung, wie dies bei metallenen Spulen der Fall ist, ist nicht erforderlich.The invention also relates to a novel induction coil having at least one primary coil for heating the electrically conductive, ceramic material of a refractory connection of the type previously discussed. It is distinguished according to the invention in that its primary coil consists of electrically conductive ceramic material. This achieves the advantage of the induction device to be able to operate permanently in an economical manner. Cooling, as is the case with metal coils, is not necessary.
Eine solche Induktionsspule kann man nach einem weiteren Vorschlag der Erfindung zum induktiven Aufheizen des elektrisch leitfähigen Materials der genannten feuerfesten Verbindungen zwischen einem für die Aufnahme von Metallschmelze bestimmten Gefäß und einer Abzugsvorrichtung, wie feuerfesten Ausgüssen der oben geschilderten Art, anwenden. In solchen Fällen ist die Primärspule in die Innenwandung oder deren thermische Isolation integriert.Such an induction coil can be used according to a further proposal of the invention for inductively heating the electrically conductive material of the said refractory connections between a vessel intended for holding molten metal and a withdrawal device, such as refractory spouts of the type described above. In such cases, the primary coil is integrated into the inner wall or its thermal insulation.
Es zeigen:
- Fig. 1
- schematisch eine die Erfindung aufweisende feuerfeste als Ausguß ausgebildete Verbindung im Vertikalschnitt, und
- Fig. 2
- eine Schnittdarstellung entsprechend Fig. 1 für eine andere Ausführungsform einer erfindungsgemäßen als Ausguß ausgebildeten Verbindung.
- Fig. 1
- schematically shows a fire-resistant connection designed as a spout in vertical section, and
- Fig. 2
- a sectional view corresponding to FIG. 1 for another embodiment of a connection designed as a spout.
Die als Ausguß ausgebildete Verbindung für eine Stranggießanlage gemäß Fig. 1 hat eine Innenwandung 1, welche einen Durchflußkanal 3 umschließt. Im Abstand ist die Innenwandung 1, in diesem Falle über ihre gesamte Länge L, von einer Primärspule 4 umgeben. Die Primärspule 4 ihrerseits ist von einer metallenen Abschirmung 5 gegen Streustrahlung umgeben, welche gekühlt sein kann. Der von der Abschirmung 5 und der Außenfläche 6 der Innenwandung 1 begrenzte Raum 7 ist von einem thermisch isolierenden Material, bspw. einem ZrO₂-Granulat, ausgefüllt. Die Primärspule 4 ist an eine frequenzabhängige Stromquelle mit regelbarer Leistung anschließbar. Auf diese Weise läßt sich die den Durchflußkanal 3 begrenzende Innenfläche 2 der Innenwandung 1 in dem erforderlichen Maße geregelt aufheizen bzw. auf der gewünschten Temperatur nach einer Aufheizung der Wandung durch die hindurchströmende Metallschmelze halten, um ein Einfrieren der Metallschmelze zu vermeiden. Die Innenfläche 2 kann eine gegenüber der Stahlschmelze elektrisch isolierende Schicht bzw. Umhüllung aufweisen.The connection designed as a spout for a continuous casting installation according to FIG. 1 has an inner wall 1 which encloses a
Bei der Ausführungsform gemäß Fig. 2 erstreckt sich die Primärspule 4 ebenfalls über die gesamte Länge L der Ausgußinnenwandung 1, im Gegensatz zu Fig. 1 ist sie jedoch, statt in das isolierende Material, in die stärker ausgebildete Ausgußinnenwandung 1 selbst eingebettet. Die ggf. gekühlte metallene Abschirmung 5 liegt hier unmittelbar an der Außenfläche 6 der Innenwandung 1 an. Auch bei der Ausführungsform gemäß Fig. 2 kann die Innenfläche 2 eine gegenüber der Stahlschmelze elektrisch isolierende Schicht bzw. Umhüllung aufweisen.In the embodiment according to FIG. 2, the
Die Primärspule 4 kann so angeordnet sein, daß ihr induzierendes Magnetfeld parallel bzw. senkrecht zur Achse der Verbindung gerichtet ist.The
In beiden dargestellten Ausführungsbeispielen kann die Primärspule 4 selbst aus elektrisch leitfähigem keramischen Material bestehen, so daß eine Kühlung der Primärspule 4 entbehrlich ist. Eine mit einer solchen Primärspule 4 ausgestattete Anordnung ist auch für andere Aufheizzwecke einsetzbar.In both of the illustrated exemplary embodiments, the
- 11
- InnenwandungInner wall
- 22nd
- InnenflächeInner surface
- 33rd
- DurchflußkanalFlow channel
- 44th
- PrimärspulePrimary coil
- 55
- Abschirmungshielding
- 66
- AußenflächeOutside surface
- 77
- Raumroom
- LL
- LängenabschnittLength section
Claims (11)
- Refractory connection which with an inner wall (1) surrounds a flow passage (3) between a vessel intended for the accommodation of metal melt and a withdrawing device for the metal melt, particularly a refractory nozzle for steel melt, whereby the inner wall (1) consists wholly or partially of ceramic material, which is electrically conductive at the liquidus temperature of the metal melt and is inductively heatable by means of a primary coil (4) energised by a current source, or includes such a material, characterised in that the primary coil (4) is a component of the inner wall (1) or is embedded in a thermally insulating material surrounding it.
- Refractory connection as claimed in claim 1, characterised in that only a longitudinal section (L) of the inner wall (1) consists of the inductively heatable material or includes it and this longitudinal section (L) includes the primary coil (4).
- Refractory connection as claimed in claim 1 or 2, characterised in that the electrically conductive ceramic material is or includes ZrO₂.
- Refractory connection as claimed in claim 3, characterised in that the ZrO₂ is stabilised by means of Cao or MgO or, in particular Y₂O₃-8
- Refractory connection as claimed in one of claims 1 to 4, characterised in that the primary coil (4) consists
- Refractory connection as claimed in one of claims 1 to 5, characterised in that the power output of the primary coil (4) may be controlled by means of a frequency-dependent current source.
- Refractory connection as claimed in one of claims 1 to 6, characterised in that the frequency of the current source is of the order of 3 to 10 MHz.
- Inductive coil for heating the electrically conductive ceramic material of a refractory connection as claimed in one of claims 1 to 7, characterised in that its primary coil (4) consists of electrically conductive ceramic material.
- Use of an inductive coil as claimed in claim 8 for inductively heating the electrically conductive material of refractory connections between a vessel containing a metal melt and a withdrawing device for the metal melt, such as refractory nozzles, as claimed in one of claims 1 to 7.
- Use as claimed in claim 9 for inductively heating the electrically conductive material of the refractory connections and an electrically conductive fluid, particularly a metal melt, flowing through it.
- Use as claimed in claim 10 for moving, particularly transporting, and/or for mixing the fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89119300T ATE94791T1 (en) | 1988-12-19 | 1989-10-18 | REFRACTORY CONNECTION AND INDUCTION COIL THEREOF. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3842690 | 1988-12-19 | ||
| DE3842690A DE3842690C2 (en) | 1988-12-19 | 1988-12-19 | Refractory connection and induction coil therefor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0379647A2 EP0379647A2 (en) | 1990-08-01 |
| EP0379647A3 EP0379647A3 (en) | 1991-03-13 |
| EP0379647B1 true EP0379647B1 (en) | 1993-09-22 |
Family
ID=6369512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89119300A Expired - Lifetime EP0379647B1 (en) | 1988-12-19 | 1989-10-18 | Refractory nozzle and induction coil therefor |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US5052597A (en) |
| EP (1) | EP0379647B1 (en) |
| JP (1) | JP2884246B2 (en) |
| KR (1) | KR900009184A (en) |
| CN (1) | CN1043648A (en) |
| AT (1) | ATE94791T1 (en) |
| BR (1) | BR8906446A (en) |
| CA (1) | CA2005657C (en) |
| DE (2) | DE3842690C2 (en) |
| ZA (1) | ZA898396B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19620403C1 (en) * | 1996-05-21 | 1997-09-18 | Didier Werke Ag | Refractory composite body with layers based on same material |
| DE10150032A1 (en) * | 2001-07-13 | 2003-01-30 | Heraeus Electro Nite Int | Fireproof spout |
| US7028868B2 (en) | 2001-07-13 | 2006-04-18 | Heraeus Electro-Nite International N.V. | Refractory nozzle |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE467241B (en) * | 1990-06-01 | 1992-06-22 | Sandvik Ab | PROCEDURE FOR WEIGHTING OF METAL CONTENT IN A BOILER IN A PLANT BEFORE CASTING |
| SE470009B (en) * | 1991-03-04 | 1993-10-25 | Stiftelsen Metallurg Forsk | Method and apparatus for gas flushing metal melts in a container |
| DE4108153A1 (en) * | 1991-03-14 | 1992-09-17 | Didier Werke Ag | Refractory molded part and its use |
| DE4125916A1 (en) * | 1991-08-05 | 1993-02-11 | Didier Werke Ag | METHOD FOR INDUCTINGLY HEATING CERAMIC MOLDED PARTS |
| US5339329A (en) * | 1993-01-25 | 1994-08-16 | Armco Steel Company, L.P. | Induction heated meniscus coating vessel |
| FR2701225B1 (en) * | 1993-02-08 | 1995-04-21 | Seva | Method for manufacturing a liquid metal transfer heating element, heating element, its application and its use. |
| DE9320208U1 (en) * | 1993-12-31 | 1994-03-31 | Kalthoff Luftfilter Und Filter | Multi-layer filter material |
| DE4428297A1 (en) * | 1994-08-10 | 1996-02-15 | Didier Werke Ag | Refractory nozzle for pouring molten metal from a vessel |
| DE19607560C2 (en) * | 1995-03-04 | 2001-05-17 | Preussenelektra Kraftwerke Ag | Device for conveying high temperature melts |
| DE19526970C2 (en) * | 1995-07-25 | 2000-11-16 | Didier Werke Ag | Process for induction heating of a refractory molded part |
| US5902509A (en) * | 1995-07-25 | 1999-05-11 | Dider-Werke Ag | Method and apparatus for inductively heating a refractory shaped member |
| AU715986B2 (en) * | 1996-06-07 | 2000-02-10 | Mannesmann Aktiengesellschaft | Casting nozzle for thin strip casting plants |
| DE19651533C2 (en) * | 1996-12-11 | 1999-01-14 | Didier Werke Ag | Process for the prevention of deposits in metallurgical vessels |
| KR100478646B1 (en) * | 1996-12-26 | 2005-06-08 | 디지털 비디오 시스템스 인코퍼레이션 | Sector Address Error Detector |
| US6425504B1 (en) | 1999-06-29 | 2002-07-30 | Iowa State University Research Foundation, Inc. | One-piece, composite crucible with integral withdrawal/discharge section |
| US6358466B1 (en) * | 2000-04-17 | 2002-03-19 | Iowa State University Research Foundation, Inc. | Thermal sprayed composite melt containment tubular component and method of making same |
| US6555801B1 (en) | 2002-01-23 | 2003-04-29 | Melrose, Inc. | Induction heating coil, device and method of use |
| US7021084B2 (en) * | 2002-12-09 | 2006-04-04 | Certainteed Corporation | Insulation shielding for glass fiber making equipment |
| US7624597B2 (en) * | 2002-12-09 | 2009-12-01 | Certainteed Corporation | Insulation shielding for glass fiber making equipment |
| AU2003301029A1 (en) * | 2002-12-16 | 2004-07-22 | Herman D. Branover | Systems and methods of electromagnetic influence on electroconducting continuum |
| BRPI0720413A2 (en) * | 2006-12-19 | 2013-12-31 | Novelis Inc | METAL TRANSFER MACHINE AND METHODS OF PROVIDING HEAT TO A MELTED METAL DRAINING THROUGH A METAL TRANSFER MACHINE AND HEATING A SECTION OF A MELTED TRANSFER CHANNEL |
| CN106334788A (en) * | 2009-10-08 | 2017-01-18 | 瓦格斯塔夫公司 | Control pin and nozzle system for heated metal casting and distribution nozzle structure |
| CN103398588B (en) * | 2013-07-26 | 2015-02-04 | 朱兴发 | Underflow-type flow-controllable electric-heating graphite nozzle device of electromagnetic induction slag smelter |
| CN106475552B (en) * | 2015-08-31 | 2018-06-26 | 鞍钢股份有限公司 | A kind of submersed nozzle and application method for eliminating wadding stream |
| EP3381587B1 (en) * | 2015-11-27 | 2020-02-05 | Posco | Nozzle, casting device, and casting method |
| CN107520437A (en) * | 2016-06-21 | 2017-12-29 | 宝山钢铁股份有限公司 | A kind of temperature compensation means and its method of ladle long nozzle low overheat |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2673228A (en) * | 1950-09-15 | 1954-03-23 | Norton Co | Induction furnace with high-temperature resistor |
| US2779073A (en) * | 1952-10-27 | 1957-01-29 | Jr Harry B Osborn | Receptacle for molten metal |
| FR1525154A (en) * | 1966-03-11 | 1968-05-17 | Improvements to casting nozzles for continuous casting of metal or carbon steel in liquid state | |
| US3435992A (en) * | 1966-03-11 | 1969-04-01 | Tisdale Co Inc | Pouring nozzle for continuous casting liquid metal or ordinary steel |
| JPS5564857A (en) * | 1978-11-07 | 1980-05-15 | Nippon Rutsubo Kk | Preheating method for steeping nozzle for continuous casting |
| JPS5820355A (en) * | 1981-07-29 | 1983-02-05 | Hitachi Ltd | Producing device for fine wire |
| DE3369452D1 (en) * | 1982-05-28 | 1987-02-26 | Western Electric Co | Modified zirconia induction furnace |
| FR2532866B1 (en) * | 1982-09-13 | 1985-06-07 | Pont A Mousson | INDUCTION HEATED CASTING CHANNEL |
| CH665369A5 (en) * | 1984-03-07 | 1988-05-13 | Concast Standard Ag | METHOD FOR CONTROLLING THE FLOW OF A METAL MELT IN CONTINUOUS CASTING, AND A DEVICE FOR IMPLEMENTING THE METHOD. |
| FR2609914B1 (en) * | 1987-01-26 | 1990-04-13 | Aubert & Duval Acieries | LIQUID METAL CASTING COMPOSITE NOZZLE, PARTICULARLY FOR METAL ATOMIZING APPARATUS |
| EP0328316B1 (en) * | 1988-02-06 | 1993-04-21 | Shinagawa Shirorenga Kabushiki Kaisha | Zirconia refractory heating element |
| US4946082A (en) * | 1989-07-10 | 1990-08-07 | General Electric Company | Transfer tube with in situ heater |
-
1988
- 1988-12-19 DE DE3842690A patent/DE3842690C2/en not_active Expired - Fee Related
-
1989
- 1989-10-18 AT AT89119300T patent/ATE94791T1/en not_active IP Right Cessation
- 1989-10-18 DE DE89119300T patent/DE58905694D1/en not_active Expired - Fee Related
- 1989-10-18 EP EP89119300A patent/EP0379647B1/en not_active Expired - Lifetime
- 1989-11-03 ZA ZA898396A patent/ZA898396B/en unknown
- 1989-12-06 JP JP1315516A patent/JP2884246B2/en not_active Expired - Lifetime
- 1989-12-12 KR KR1019890018363A patent/KR900009184A/en not_active Application Discontinuation
- 1989-12-14 US US07/450,921 patent/US5052597A/en not_active Expired - Fee Related
- 1989-12-14 BR BR898906446A patent/BR8906446A/en unknown
- 1989-12-15 CN CN89109294A patent/CN1043648A/en active Pending
- 1989-12-15 CA CA002005657A patent/CA2005657C/en not_active Expired - Fee Related
-
1990
- 1990-08-03 US US07/562,382 patent/US5054664A/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19620403C1 (en) * | 1996-05-21 | 1997-09-18 | Didier Werke Ag | Refractory composite body with layers based on same material |
| DE10150032A1 (en) * | 2001-07-13 | 2003-01-30 | Heraeus Electro Nite Int | Fireproof spout |
| DE10150032C2 (en) * | 2001-07-13 | 2003-11-20 | Heraeus Electro Nite Int | Fireproof spout |
| US7028868B2 (en) | 2001-07-13 | 2006-04-18 | Heraeus Electro-Nite International N.V. | Refractory nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE94791T1 (en) | 1993-10-15 |
| CA2005657A1 (en) | 1990-06-19 |
| US5052597A (en) | 1991-10-01 |
| DE58905694D1 (en) | 1993-10-28 |
| US5054664A (en) | 1991-10-08 |
| EP0379647A3 (en) | 1991-03-13 |
| CA2005657C (en) | 1999-06-15 |
| EP0379647A2 (en) | 1990-08-01 |
| CN1043648A (en) | 1990-07-11 |
| BR8906446A (en) | 1990-08-21 |
| DE3842690C2 (en) | 1998-04-30 |
| KR900009184A (en) | 1990-07-02 |
| JP2884246B2 (en) | 1999-04-19 |
| DE3842690A1 (en) | 1990-06-21 |
| JPH02274368A (en) | 1990-11-08 |
| ZA898396B (en) | 1990-07-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0379647B1 (en) | Refractory nozzle and induction coil therefor | |
| DE3709905C2 (en) | ||
| EP0152849A2 (en) | Casting ladle or tundish | |
| DE3427268C2 (en) | Device for determining the presence of metallic melt in a flow channel of a metallurgical furnace or a ladle | |
| DE102006004637B4 (en) | Inductively heatable skull crucible, melting plant and process for the continuous production of a molten glass | |
| EP0761347A1 (en) | Process for operating an inductor and inductor for carrying out this process | |
| DE19515230C2 (en) | Process for the inductive heating of a refractory molded part and a corresponding molded part | |
| WO1998005452A1 (en) | Method, device and fireproof nozzle for the injection and/or casting of liquid metals. | |
| WO1995010929A1 (en) | Bottom electrode for a metallurgical vessel | |
| EP0959997A2 (en) | Method, device and closure member for casting on liquid casts | |
| DD201835A5 (en) | ELECTRODE FOR LIGHT BOW OUTS | |
| DE19651534A1 (en) | Method, device and refractory pouring spout for pouring and / or pouring liquid metals | |
| DE3446260A1 (en) | Electric smelting furnace, especially induction furnace | |
| DE1558202A1 (en) | Method and device for shaping reactive material | |
| EP0077498A2 (en) | Submersible induction pump, in particular for aluminium | |
| CH639577A5 (en) | SLIDER PLATE FOR SLIDING LATCHES ON CONTAINERS CONTAINING METAL MELT AND METHOD FOR THE PRODUCTION OF SUCH SLIDING PLATES. | |
| EP0180891B1 (en) | Ring-shaped linear induction immerged pump for pumping liquid metal | |
| DE3105129A1 (en) | EQUIPMENT OF TAPE HOLE OF A MELTING FURNACE FOR NON-METAL MATERIALS | |
| DE3041741C2 (en) | Induction channel furnace | |
| AT225434B (en) | Induction furnace coil for vacuum furnaces | |
| DE1565207A1 (en) | Electrode for electric arc furnaces | |
| DE2750455C3 (en) | Pouring cap for metallurgical vessels, in particular for melting or tub holding furnaces | |
| WO2020148438A1 (en) | Device for inductively heating metal workpieces | |
| DE2122340C3 (en) | Lining for induction coils | |
| DE10041418C1 (en) | Outlet arrangement used for a vessel, e.g. an electric arc furnace for receiving a molten metal has a monolithic outlet body made from a refractory material coupled to the electromagnetic alternating field of an inductor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19891103 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
| 17Q | First examination report despatched |
Effective date: 19920409 |
|
| ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO ROMA S.P.A. |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
| REF | Corresponds to: |
Ref document number: 94791 Country of ref document: AT Date of ref document: 19931015 Kind code of ref document: T |
|
| ET | Fr: translation filed | ||
| REF | Corresponds to: |
Ref document number: 58905694 Country of ref document: DE Date of ref document: 19931028 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19930930 |
|
| EPTA | Lu: last paid annual fee | ||
| REG | Reference to a national code |
Ref country code: GR Ref legal event code: FG4A Free format text: 3009327 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19940102 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 19941001 Year of fee payment: 6 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19941031 Year of fee payment: 6 |
|
| EAL | Se: european patent in force in sweden |
Ref document number: 89119300.5 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19951018 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GR Payment date: 19951025 Year of fee payment: 7 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19960501 |
|
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19960501 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 19961030 Year of fee payment: 8 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19970430 |
|
| REG | Reference to a national code |
Ref country code: GR Ref legal event code: MM2A Free format text: 3009327 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20010925 Year of fee payment: 13 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20011017 Year of fee payment: 13 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20011023 Year of fee payment: 13 Ref country code: CH Payment date: 20011023 Year of fee payment: 13 Ref country code: BE Payment date: 20011023 Year of fee payment: 13 Ref country code: AT Payment date: 20011023 Year of fee payment: 13 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20011219 Year of fee payment: 13 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20021018 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20021018 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20021019 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20021031 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20021031 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20021031 |
|
| BERE | Be: lapsed |
Owner name: *DIDIER-WERKE A.G. Effective date: 20021031 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030501 |
|
| EUG | Se: european patent has lapsed | ||
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20021018 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030630 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20051018 |