EP0072769B1 - Procédé et dispositif de chauffage par induction de métaux fondus - Google Patents

Procédé et dispositif de chauffage par induction de métaux fondus Download PDF

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Publication number
EP0072769B1
EP0072769B1 EP19820630068 EP82630068A EP0072769B1 EP 0072769 B1 EP0072769 B1 EP 0072769B1 EP 19820630068 EP19820630068 EP 19820630068 EP 82630068 A EP82630068 A EP 82630068A EP 0072769 B1 EP0072769 B1 EP 0072769B1
Authority
EP
European Patent Office
Prior art keywords
legs
heater
opening
tube
heating
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
EP19820630068
Other languages
German (de)
English (en)
Other versions
EP0072769A1 (fr
Inventor
Paul Metz
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.)
METZ, PAUL
Original Assignee
Individual
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
Priority claimed from LU83550A external-priority patent/LU83550A1/de
Priority claimed from LU83763A external-priority patent/LU83763A1/de
Application filed by Individual filed Critical Individual
Priority to AT82630068T priority Critical patent/ATE25314T1/de
Publication of EP0072769A1 publication Critical patent/EP0072769A1/fr
Application granted granted Critical
Publication of EP0072769B1 publication Critical patent/EP0072769B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • H05B6/16—Furnaces having endless cores

Definitions

  • the invention relates to a method and a device for the inductive heating of liquid metals in metallurgical vessels, before casting and in particular before and during continuous casting.
  • the liquid steel to be poured from the melting furnace or fresh vessel, in most cases a converter, into the transport or treatment pan has a temperature of around 1580-1720 ° C, depending on the steel quality.
  • the steel is usually heated in the pan with a view to continuous casting by means of electric arc systems.
  • this procedure has the particular disadvantage that there is a pronounced uncontrolled nitrogen uptake in the hot focal spot.
  • the metal is heated by induction.
  • Pans equipped with inductive heating devices on the floor or on the side wall have been proposed for this purpose.
  • the disadvantage of this procedure lies particularly in the necessary special design of the pans.
  • DE-A-2 906 634 it is known to pump and heat part of a liquid metal located in an oven boiler continuously through at least one U-shaped induction heating element brought into contact with the contents of the vessel by lowering it from above.
  • the immersion depth can be set automatically, e.g. by the electrical values, which depend on the immersion depth, are measured; a signal is generated from these measured values, which acts on a control device adjusting the height of the heating element.
  • US-A-3 251 921 describes a U-tube-shaped heating element which can be lowered from above into a conventional vessel containing the melt and in which the liquid metal is inductively heated by a winding.
  • the heating element can be shielded by a protective shield.
  • the object of the invention is to propose a method and a device which allow the flow of the metal to be easily initiated in tubular induction heating elements.
  • FIG. 1 shows a section through a possible embodiment of the device according to the invention in a non-limiting manner.
  • the device according to the invention consists of one Block 10, which is suspended via a support element 0 on an automatically controlled lifting mechanism, not shown.
  • the block 10 is equipped with a carrier plate 11 which has a toothing into which a corresponding toothed cover plate 2 can snap.
  • the cover plate covers the contents of the vessel and thus reduces heat losses; when lifting it is lifted off the container and removed.
  • the block 10 consists of a steel-coated refractory mass, in which the heating tube 20 is embedded. This comprises a fireproof inner lining 21 and a fireproof outer protection 22, which is dimensioned with regard to the depth of immersion of the tube in the metal M and through the slag layer S.
  • the openings of the tube are protected with thin sheet metal hoods which melt after penetration of the slag layer and expose the openings of the tube.
  • a strong negative pressure is created and maintained within the tube, for which purpose there is a suction arrangement 25 in block 10, which opens into tube 20 and which is connected to a pump unit, not shown.
  • the hood 23a or 23b arranged at one of the openings can be made thicker than that at the other opening or can be provided with a protective layer so that the other hood melts when both legs are simultaneously immersed in the bath. This creates the conditions for a siphon effect and for the metal flow.
  • firstly the said siphon effect and secondly the electromagnetic force of the coil 30 is used.
  • gas lifting effect can be used, in the bottom of the distributor vessel and below the inlet Leg is a gas-permeable element 3 is arranged, through the supply line 4, a neutral gas is passed into the melt and this is stirred at the same time.
  • the known design of the vacuum suction device is not shown in the drawing.
  • the electromagnetic heating coil 30 which encloses one leg of the tube and which is shielded against the radiant heat of the bath by means of the protective shield 24.
  • the power supply line 31 of the coil and its coolant line 32 are embedded in the block 10 and are fastened to the support element 0.
  • the continuous distance measurement between the device and the bath level is ensured by the measuring device 40, the measuring cable of which is also embedded in the block 10 for protection against the heat and is guided along the support element 0 to control the lifting mechanism.
  • the measuring device 40 can be, for example, a known laser source / detector system that continuously determines the respective distance between the block and the bath level. If the distance rises above a predefined setpoint, the control of the hoist is addressed accordingly and the block is lowered until the setpoint is reached again. The latter can be determined empirically, since the heating tube 20 is connected in a fixed manner to the block 10.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Furnace Details (AREA)

Claims (4)

1. Procédé de chauffage par induction de métaux liquides contenus dans des récipients métallurgiques avant la coulée et en particulier avant ou pendant la coulée continue dans lequel on pompe en continu et réchauffe en même temps une partie du métal se trouvant dans un récipient classique par au moins un tube inducteur en forme de U, mis en contact avec le contenu du récipient en abaissant de haut en bas ledit inducteur précédé par ses deux ailes, où pour engendrer la circulation du métal, on applique une dépression, caractérisé en ce que la circulation du métal à travers le tube inducteur est amorcée en obturant, au moyen de couvercles en tôle, les ouvertures des deux ailes du tube inducteur en forme de U, l'une des ouvertures étant fermée au moyen d'un couvercle en tôle fondant plus rapidement que celui de la deuxième ouverture, en créant ensuite dans l'élément chauffant une dépression et en plongeant les deux ailes simultanément dans le bain.
2. Procédé selon la revendication 1, caractérisé en ce qu'on renforce le débit de métal à travers l'élément chauffant par l'application du principe de l'élévateur par bulles gazeuses, en introduisant dans le fond du récipient en dessous de l'aile d'entrée du métal dans l'élément de chauffage, un élément poreux alimenté en gaz neutre.
3. Dispositif pour la mise en oeuvre du procédé selon les revendications 1 ou 2, dans lequel l'élément de chauffage par induction, constitué d'un tube inducteur en forme de U (20), dont les ailes sont dirigées vers le bas et d'une bobine de chauffage (30) qui entoure une des ailes, est disposé dans un bloc (10) qui par l'intermédiaire d'un câble (0) est relié à un élément de levage, une commande de cet élément de levage étant reliée au moyen d'un câble de mesure (41) à un appareil de mesure de distance (40), situé en dessous du bloc (10) et où sont prévus des moyens (25) permettant la création d'une dépression dans le tube chauffant (20), caractérisé en ce que les ouvertures du tube chauffant (20) sont fermées au moyen de couvercles en tôle (23a, 23b), en vue d'amorcer la circulation et en vue de protéger les ouvertures contre l'introduction de scories lors de l'opération de plongée dans le métal, le couvercle en tôle (23a) fixé à une des ouvertures du tube (20) étant réalisé d'une manière telle qu'il fonde plus rapidement que le couvercle de l'autre ouverture.
4. Dispositif selon la revendication 3, caractérisé en ce que le couvercle en tôle (23b) fixé à l'autre ouverture est plus épais que le couvercle fixé à l'une des ouvertures, ou recouvert d'une couche de protection.
EP19820630068 1981-08-13 1982-07-06 Procédé et dispositif de chauffage par induction de métaux fondus Expired EP0072769B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82630068T ATE25314T1 (de) 1981-08-13 1982-07-06 Verfahren und vorrichtung zum induktiven aufheizen von fluessigen metallen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
LU83550A LU83550A1 (de) 1981-08-13 1981-08-13 Verfahren und vorrichtung zum induktiven aufheizen von fluessigen metallen und legierungen
LU83550 1981-08-13
LU83763A LU83763A1 (de) 1981-11-17 1981-11-17 Verfahren und vorrichtung zum induktiven aufheizen von fluessigen metallen
LU83763 1981-11-17

Publications (2)

Publication Number Publication Date
EP0072769A1 EP0072769A1 (fr) 1983-02-23
EP0072769B1 true EP0072769B1 (fr) 1987-01-28

Family

ID=26640282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820630068 Expired EP0072769B1 (fr) 1981-08-13 1982-07-06 Procédé et dispositif de chauffage par induction de métaux fondus

Country Status (2)

Country Link
EP (1) EP0072769B1 (fr)
DE (1) DE3275344D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3634891C1 (de) * 1986-10-14 1988-05-19 Didier Werke Ag Nachheizeinrichtung bei einer Horizontal-Stranggiessanlage
US4834876A (en) * 1988-03-14 1989-05-30 Walker Nicholas G Filtration assembly having integral heating means for maintaining the metallic material being filtered in the molten state

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL27841C (fr) * 1928-11-03
GB656730A (en) * 1948-03-01 1951-08-29 Electric Furnace Co Improvements in or relating to induction furnaces
DE1021519B (de) * 1954-04-06 1957-12-27 Otto Junker G M B H Elektrisch-induktiv wirkender Tauchheizkoerper zur Beheizung von Metallschmelzbaedern
US3251921A (en) * 1963-03-22 1966-05-17 Harry A Hartley Metal heating and circulating apparatus
GB1036995A (en) * 1964-05-04 1966-07-20 Ass Elect Ind Improvements relating to apparatus for heating molten metal
DE2906634A1 (de) * 1979-02-09 1980-08-21 Bbc Brown Boveri & Cie Induktionsofen

Also Published As

Publication number Publication date
EP0072769A1 (fr) 1983-02-23
DE3275344D1 (en) 1987-03-05

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