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EP0379647B1 - Busette réfractaire et sa bobine à induction - Google Patents

Busette réfractaire et sa bobine à induction Download PDF

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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
Application number
EP89119300A
Other languages
German (de)
English (en)
Other versions
EP0379647A3 (fr
EP0379647A2 (fr
Inventor
Raimund Brückner
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 AT89119300T priority Critical patent/ATE94791T1/de
Publication of EP0379647A2 publication Critical patent/EP0379647A2/fr
Publication of EP0379647A3 publication Critical patent/EP0379647A3/fr
Application granted granted Critical
Publication of EP0379647B1 publication Critical patent/EP0379647B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • General Induction Heating (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Laminated Bodies (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Gasification And Melting Of Waste (AREA)

Claims (11)

  1. Elément de liaison réfractaire qui, par une paroi intérieure (1), entoure un conduit d'écoulement (3) entre un récipient destiné à recevoir un bain de métal en fusion et un dispositif d'écoulement pour le métal fondu, en particulier busette réfractaire pour des bains d'acier fondu, la paroi intérieure (1) étant, en totalité ou en partie, réalisée en un matériau céramique qui est électriquement conducteur à au moins la température de liquidus du bain de métal fondu et peut être chauffé par induction au moyen d'une bobine primaire (4) alimentée par une source de courant ou comportant un matériau de ce type, caractérisée par le fait que la bobine primaire (4) fait partie de la paroi intérieure (1) ou est noyée dans un matériau thermiquement isolant qui entoure celle-ci.
  2. Elément de liaison réfractaire selon la revendication 1, caractérisée par le fait que seule une partie de la longueur (L) de la paroi intérieure (1) est réalisée en matériau pouvant être chauffé par induction ou présente ce matériau et cette partie de longueur (L) comporte la bobine primaire (4).
  3. Elément de liaison réfractaire selon la revendication 1 ou 2, caractérisée par le fait que le matériau céramique électriquement conducteur est ou contient du ZrO₂.
  4. Elément de liaison réfractaire selon la revendication 3, caractérisée par le fait que le ZrO₂ est stabilisé à l'aide de CaO ou MgO ou en particulier de Y₂O₃.
  5. Elément de liaison réfractaire selon l'une des revendications 1 à 4, caractérisée par le fait que la bobine primaire (4) est en matériau céramique électriquement conducteur.
  6. Elément de liaison réfractaire selon l'une des revendications 1 à 5, caractérisée par le fait que la puissance délivrée par la bobine primaire (4) peut être réglée au moyen d'une source de courant dépendante de la fréquence.
  7. Elément de liaison réfractaire selon l'une des revendications 1 à 6, caractérisée par le fait que la fréquence de la source de courant est de l'ordre de 3 à 10 MHz.
  8. Bobine d'induction pour le chauffage du matériau céramique électriquement conducteur d'un élément de liaison réfractaire selon l'une des revendications 1 à 7, caractérisée par le fait que sa bobine primaire (4) est en matériau céramique électriquement conducteur.
  9. Utilisation d'une bobine d'induction selon la revendication 8, pour chauffer par induction le matériau électriquement conducteur d'éléments de liaison réfractaires entre un récipient contenant un bain de métal fondu et un dispositif de prélèvement du bain de métal fondu, tels que des busettes réfractaires, conformément à l'une des revendications 1 à 7.
  10. Utilisation selon la revendication 9, pour chauffer par induction le matériau électriquement conducteur des élément de liaison réfractaires et un fluide électriquement conducteur, en particulier un bain de métal fondu, s'écoulant à travers celle-ci.
  11. Utilisation selon la revendication 10 pour déplacer, en particulier transporter et/ou mélanger le fluide.
EP89119300A 1988-12-19 1989-10-18 Busette réfractaire et sa bobine à induction Expired - Lifetime EP0379647B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89119300T ATE94791T1 (de) 1988-12-19 1989-10-18 Feuerfeste verbindung sowie induktionsspule hierfuer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842690 1988-12-19
DE3842690A DE3842690C2 (de) 1988-12-19 1988-12-19 Feuerfeste Verbindung sowie Induktionsspule hierfür

Publications (3)

Publication Number Publication Date
EP0379647A2 EP0379647A2 (fr) 1990-08-01
EP0379647A3 EP0379647A3 (fr) 1991-03-13
EP0379647B1 true EP0379647B1 (fr) 1993-09-22

Family

ID=6369512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89119300A Expired - Lifetime EP0379647B1 (fr) 1988-12-19 1989-10-18 Busette réfractaire et sa bobine à induction

Country Status (10)

Country Link
US (2) US5052597A (fr)
EP (1) EP0379647B1 (fr)
JP (1) JP2884246B2 (fr)
KR (1) KR900009184A (fr)
CN (1) CN1043648A (fr)
AT (1) ATE94791T1 (fr)
BR (1) BR8906446A (fr)
CA (1) CA2005657C (fr)
DE (2) DE3842690C2 (fr)
ZA (1) ZA898396B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19620403C1 (de) * 1996-05-21 1997-09-18 Didier Werke Ag Keramischer Verbundkörper und Verfahren zu seiner Herstellung
DE10150032A1 (de) * 2001-07-13 2003-01-30 Heraeus Electro Nite Int Feuerfester Ausguss
US7028868B2 (en) 2001-07-13 2006-04-18 Heraeus Electro-Nite International N.V. Refractory nozzle

Families Citing this family (26)

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SE467241B (sv) * 1990-06-01 1992-06-22 Sandvik Ab Foerfarande foer vaegning av metallinnehaall i ett kaerl i en anlaeggning foer gjutning
SE470009B (sv) * 1991-03-04 1993-10-25 Stiftelsen Metallurg Forsk Förfarande och anordning för gasspolning av metallsmälta i en behållare
DE4108153A1 (de) * 1991-03-14 1992-09-17 Didier Werke Ag Feuerfestes formteil und dessen verwendung
DE4125916A1 (de) * 1991-08-05 1993-02-11 Didier Werke Ag Verfahren zum induktiven aufheizen von keramischen formteilen
US5339329A (en) * 1993-01-25 1994-08-16 Armco Steel Company, L.P. Induction heated meniscus coating vessel
FR2701225B1 (fr) * 1993-02-08 1995-04-21 Seva Procédé de fabrication d'un organe chauffant de transfert de métal liquide, organe chauffant, son application et son utilisation.
DE9320208U1 (de) * 1993-12-31 1994-03-31 Kalthoff Luftfilter und Filtermedien GmbH, 59379 Selm Mehrschichtiges Filtermaterial
DE4428297A1 (de) * 1994-08-10 1996-02-15 Didier Werke Ag Feuerfeste Düse und Verfahren zum Vergießen einer Metallschmelze aus einem Gefäß
DE19607560C2 (de) * 1995-03-04 2001-05-17 Preussenelektra Kraftwerke Ag Vorrichtung zum Fördern von Hochtemperaturschmelzen
US5902509A (en) * 1995-07-25 1999-05-11 Dider-Werke Ag Method and apparatus for inductively heating a refractory shaped member
DE19526970C2 (de) * 1995-07-25 2000-11-16 Didier Werke Ag Verfahren zum induktiven Aufheizen eines feuerfesten Formteils
RU2153950C1 (ru) * 1996-06-07 2000-08-10 Маннесманн Аг Литейное сопло для установки непрерывной разливки тонкой ленты
DE19651533C2 (de) * 1996-12-11 1999-01-14 Didier Werke Ag Verfahren zur Verhinderung von Ansätzen in metallurgischen Gefäßen
KR100478646B1 (ko) * 1996-12-26 2005-06-08 디지털 비디오 시스템스 인코퍼레이션 섹터어드레스에러감지기
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
EP1578551A2 (fr) * 2002-12-16 2005-09-28 Irving I. Dardik Systemes et procedes d'influence electromagnetique sur un continuum electroconducteur
CA2673272A1 (fr) * 2006-12-19 2008-06-26 Novelis Inc. Methode et appareil de convoyage de metal fondu et de rechauffage dudit metal
EP2486156A4 (fr) * 2009-10-08 2014-07-23 Wagstaff Inc Quenouille de régulation et système de busette de coulée pour le chauffage des configurations des busettes de coulée distribuant du métal en fusion
CN103398588B (zh) * 2013-07-26 2015-02-04 朱兴发 电磁感应矿渣熔炉底流式流量可控的电热石墨水口装置
CN106475552B (zh) * 2015-08-31 2018-06-26 鞍钢股份有限公司 一种消除絮流的浸入式水口及使用方法
WO2017090819A1 (fr) * 2015-11-27 2017-06-01 주식회사 포스코 Busette de coulée, dispositif de coulée et procédé de coulée
CN107520437A (zh) * 2016-06-21 2017-12-29 宝山钢铁股份有限公司 一种钢包长水口低过热度的温度补偿装置及其方法

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US2779073A (en) * 1952-10-27 1957-01-29 Jr Harry B Osborn Receptacle for molten metal
FR1525154A (fr) * 1966-03-11 1968-05-17 Perfectionnements aux busettes de coulée pour la coulée continue de métal ou d'acier ordinaire à l'état liquide
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JPS5564857A (en) * 1978-11-07 1980-05-15 Nippon Rutsubo Kk Preheating method for steeping nozzle for continuous casting
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DE3369452D1 (en) * 1982-05-28 1987-02-26 Western Electric Co Modified zirconia induction furnace
FR2532866B1 (fr) * 1982-09-13 1985-06-07 Pont A Mousson Chenal de coulee chauffe par induction
CH665369A5 (de) * 1984-03-07 1988-05-13 Concast Standard Ag Verfahren zur regelung des durchflusses einer metallschmelze beim stranggiessen, und eine vorrichtung zur durchfuehrung des verfahrens.
FR2609914B1 (fr) * 1987-01-26 1990-04-13 Aubert & Duval Acieries Busette composite de coulee de metal liquide, notamment pour appareil d'atomisation du metal
EP0328316B1 (fr) * 1988-02-06 1993-04-21 Shinagawa Shirorenga Kabushiki Kaisha Elément de chauffage en oxyde de zirconium
US4946082A (en) * 1989-07-10 1990-08-07 General Electric Company Transfer tube with in situ heater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19620403C1 (de) * 1996-05-21 1997-09-18 Didier Werke Ag Keramischer Verbundkörper und Verfahren zu seiner Herstellung
DE10150032A1 (de) * 2001-07-13 2003-01-30 Heraeus Electro Nite Int Feuerfester Ausguss
DE10150032C2 (de) * 2001-07-13 2003-11-20 Heraeus Electro Nite Int Feuerfester Ausguss
US7028868B2 (en) 2001-07-13 2006-04-18 Heraeus Electro-Nite International N.V. Refractory nozzle

Also Published As

Publication number Publication date
CA2005657C (fr) 1999-06-15
JP2884246B2 (ja) 1999-04-19
ATE94791T1 (de) 1993-10-15
JPH02274368A (ja) 1990-11-08
EP0379647A3 (fr) 1991-03-13
ZA898396B (en) 1990-07-25
EP0379647A2 (fr) 1990-08-01
CA2005657A1 (fr) 1990-06-19
BR8906446A (pt) 1990-08-21
DE3842690C2 (de) 1998-04-30
US5054664A (en) 1991-10-08
CN1043648A (zh) 1990-07-11
US5052597A (en) 1991-10-01
DE58905694D1 (de) 1993-10-28
KR900009184A (ko) 1990-07-02
DE3842690A1 (de) 1990-06-21

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