EP0406208B1 - Vorrichtung zum Vorheizen einer Giessdüse für geschmolzenes Metall und mit dieser Vorrichtung ausgerüstete Metallgiesseinrichtung - Google Patents

Vorrichtung zum Vorheizen einer Giessdüse für geschmolzenes Metall und mit dieser Vorrichtung ausgerüstete Metallgiesseinrichtung Download PDF

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Publication number
EP0406208B1
EP0406208B1 EP90870094A EP90870094A EP0406208B1 EP 0406208 B1 EP0406208 B1 EP 0406208B1 EP 90870094 A EP90870094 A EP 90870094A EP 90870094 A EP90870094 A EP 90870094A EP 0406208 B1 EP0406208 B1 EP 0406208B1
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EP
European Patent Office
Prior art keywords
burner
stopper rod
nozzle
chamber
tube
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
EP90870094A
Other languages
English (en)
French (fr)
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EP0406208A1 (de
Inventor
Paul Naveau
Stéphan Wilmotte
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.)
Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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Publication of EP0406208A1 publication Critical patent/EP0406208A1/de
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Publication of EP0406208B1 publication Critical patent/EP0406208B1/de
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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • 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
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
    • B22D41/01—Heating means
    • B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
    • 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

Definitions

  • the present invention relates to a device for preheating a nozzle for casting a molten metal, in particular steel, according to the preamble of claim 1, which is based on WO-A-88-06068.
  • a conventional installation for casting a metal essentially consists of a container containing the metal to be poured, and a mold in which the metal is poured and where it solidifies to the desired shape.
  • the container is generally a ladle and the mold an ingot mold in which ingots intended for rolling are produced.
  • the installation generally comprises an additional container, the distribution basket, arranged between the casting ladle and the ingot mold, which here has no bottom.
  • Each of these containers namely the ladle and the distribution basket in the case of continuous casting, is provided at its bottom with a pouring opening allowing the flow of molten steel to the next container or to the mold.
  • a pouring orifice is materialized by a refractory brick, called pouring brick or bottom nozzle, housed in the refractory lining of the bottom of the container and pierced with a calibrated channel which constitutes the taphole.
  • a refractory brick called pouring brick or bottom nozzle
  • the bottom nozzle is extended, towards the outside of the container, by a tube whose internal section is appropriate to that of the tap hole.
  • This tube which is intended to immerse in the steel contained in the next container or in the ingot mold is often called a submerged nozzle or an external nozzle.
  • the inlet of the bottom nozzle is usually profiled in a seat on which is applied a pad, also profiled, intended to close the tap hole.
  • This pad or stopper is also made of refractory material.
  • Such a device in fact comprises a distributor plate, or dome, of refractory material, placed in the axis of the taphole, between the bottom nozzle and the external nozzle. This dome obstructs the propagation of the flame from the burner to the bottom nozzle and consequently prevents adequate heating of this bottom nozzle as well as of the upper surface of the dome.
  • the object of the present invention is to provide a device which makes it possible, in a simple and reliable manner, to remedy the aforementioned drawbacks.
  • the preheating device according to the invention has virtually no bulk, and it is easy to position and orient with precision; it can also be used with the various types of existing casting devices, in particular with those which have been mentioned above.
  • a device for preheating a nozzle for casting a molten metal said nozzle being, at least in part, disposed in the refractory lining of the bottom of a metallurgical container, said device comprising a tube made of refractory material placed inside said metallurgical container, is characterized in that it comprises at least one burner, in that said burner is housed in said tube of refractory material and in that it is oriented towards the section d entry of said nozzle.
  • a so-called premix burner is advantageously used, that is to say a burner in which the mixing of the fuel and the oxidant takes place inside the burner.
  • said refractory tube is a stopper for closing said pouring nozzle and said burner is arranged in a chamber formed inside said stopper, and the lower end of the stopper rod is pierced with at least one channel communicating with said chamber.
  • the chamber extends in the longitudinal direction of the stopper rod, coaxial thereto, and the burner occupies an upper part of the chamber, the latter thus having a free volume in the region of the lower end of the distaff.
  • the burner can be provided, in the region of its outlet end, with centering and / or sealing means; these means are preferably constituted by a ring, placed at the outlet end of the burner, which ensures on the one hand the centering of the burner in said interior chamber and on the other hand the sealed separation between said free volume and the rest of the room where the burner is located.
  • said channel pierced in the lower end of the stopper has a section coaxial with the stopper and having a diameter less than that of said interior chamber.
  • lateral outlet channels are preferably provided at the lower end of the stopper rod, which surround said coaxial channel and which open into it at suitable angles.
  • the angle of inclination of these lateral channels with respect to the coaxial channel is advantageously less than 90 ° and preferably less than 60 °.
  • a sleeve is provided around the lower end of the refractory tube, respectively of the stopper rod, in order to avoid any disturbance of the flame by external influences.
  • Fig. 1 shows a preheating device representative of the prior art of preheating a pouring nozzle.
  • a fragment of a bottom 1 of a basket for distributing continuous steel In this bottom fragment 1 is housed a bottom nozzle 2, which is extended downwards by an external nozzle 3.
  • the bottom nozzle 2 has, at the entrance of the taphole 4, a rounded seat 5 on which comes apply the profiled lower end, or nose 6, of a stopper 7 of refractory material.
  • a burner 8 is arranged under the external nozzle 3, in alignment with the latter; the flame 9 of this burner can propagate over the entire length of the external nozzle 3 and of the bottom nozzle 2, and reach the profiled nose 6 of the stopper rod 7.
  • a steel cooling device is placed between the bottom 1 and the outer nozzle 3.
  • This device comprises a dome 11 made of refractory material, intended to form a hollow jet of steel in the device 10. This dome 11 would prevent the flame of a lower burner from propagating to the bottom nozzle 2 and to the nose 6 of the stopper 7.
  • the preheating device comprises a hollow stopper rod 12, made of refractory material, inside which is placed a burner 13 directed from top to bottom, that is to say towards the seat 5 and the tap hole 4 of the bottom nozzle 2.
  • the flame 14 can then reach the upper surface of the dome 11, as well as the nozzle 3, which ensures a fluid flow of the steel towards the device 10.
  • Fig. 3 shows in more detail a preheating device according to the invention.
  • the cooling device 10 and the external nozzle 3 which are not part of the invention and which are moreover shown in FIG. 2.
  • This assembly is recalled by the dome 11, which is placed at the outlet of the tap hole 4 of the bottom nozzle 2.
  • the stopper 12 of refractory material is hollow; it has an axial chamber 15, in which is disposed a premix burner 13.
  • the axial chamber 15 extends beyond the head 16 of the burner in the direction of the lower end of the stopper; it thus forms a free volume 17, which communicates with the outside via an axial channel 18, of diameter substantially smaller than that of this free volume 17.
  • the channel 18 opens axially in the nose of the stopper; inclined lateral channels 19 are also provided, which open on the one hand into the axial channel 18 and on the other hand into the profiled part 6 of the stopper rod 12.
  • the burner is supplied with fuel and with oxidant, from preferably gas, by two pipes 21, 22 of small diameter.
  • the entire burner, with its supply lines, is preferably made of stainless steel.
  • the head 16 of the burner 13 is centered in the axial chamber 15 by means of a ring 20, which also provides a sealed separation between the free volume 17 and the upper or upstream part of the chamber 15.
  • the lower end of the stopper 12 can be surrounded by a sleeve 23, for example of frustoconical shape, which rests on the bottom 1 around the bottom nozzle 2.
  • the combustible and oxidizing gases pass through the pipes 21, 22 at high speed and thus ensure the cooling of these pipes and of the head 16 of the burner.
  • the gas mixture arrives at high speed in the free volume 17 then, through the axial channel 18 and the lateral channels 19, the flame 14 leaves the lower end of the stopper 12 in the direction of the bottom nozzle 2.
  • the axial flame penetrates into the tap hole 4 and propagates to the dome, the upper surface of which it heats.
  • the side flames heat the seat 5 of the bottom nozzle 2.
  • the lateral channels 19 are inclined on the axial channel 18 at an angle of less than 90 °, and preferably less than 60 °. This angle is chosen, according to the profile of the seat 5 and the rounded 6, so that the lateral channels 19 are directed towards the seat 5 during the preheating period of the nozzle and that they are not obstructed by the steel when the stopper rod is applied to the seat 5.
  • the sleeve 23 is preferably made of low density ceramic fiber. It makes it possible to avoid the blowing of the flame 14 by the eddies of gas or air which can occur in the distributor basket. It also ensures the maintenance of a high temperature around the seat 5 by reducing the heat losses. The height of the sleeve 23 must be sufficient to guarantee the desired protection.
  • the efficiency of preheating can also be influenced by the relative position of the burner 16 and the nose 6 of the stopper rod relative to the seat 5 of the nozzle to be preheated.
  • This position can be defined by the height H of the burner 16 and / or h of the nose 6 above the bottom 1 of the basket; this height depends in particular on the geometry of the nozzle 2 (diameter, radius of curvature of the seat).
  • the height H should be understood to be preferably between 300 mm and 600 mm, and that the height h should preferably be less than 50 mm.
  • a bottom nozzle in graphite alumina and a distribution dome, arranged as shown in Fig.3.
  • the purpose of the excess gas was to increase the stability of the flame and to avoid decarburization of the graphite alumina nozzle.
  • the height h was 20 mm and the height H was 470 mm; the sleeve was 300 mm high.
  • the dome and the nozzle had a temperature of the order of 1200 ° C., clearly sufficient to start casting the steel without the risk of freezing.
  • the device of the invention allows a relatively long area to be heated with the same efficiency going from the seat 5 to the dome 11. It provides high heating power, while guaranteeing good resistance to the temperature of the burner head. There is no problem of space or installation.
  • the invention is of course not limited to the embodiment which has just been described and illustrated. It also includes various modifications that a person skilled in the art could make to it, for example by using a refractory tube which is not the stopper stopper stopper. Furthermore, the device of the invention can be used for the preheating of conventional type casting nozzles having no metal distribution dome. Finally, the use of the device of the invention is not limited to continuous casting.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (10)

  1. Einrichtung zum Vorwärmen eines Ausgußes (2) zum Gießen schmelzflüssigen Metalls, wobei dieser Ausguß. zumindest teilweise im Bodenfutter (1) eines metallurgischen Behälters angeordnet ist, welche Einrichtung aus einem innerhalb dieses metallurgischen Behälters angeordneten Rohr (12) aus feuerfestem Material besteht, dadurch gekennzeichnet, daß sie mindestens einen Brenner (13) enthält, daß dieser Brenner (13) in diesem Rohr (12) aus feuerfestem Material angeordnet ist und daß er auf den Einlaßabschnitt dieses Ausgußes hin ausgerichtet ist.
  2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß dieses Rohr aus feuerfestem Material eine Stopfenstange (12) zum Schließen dieses Ausgußes ist, daß dieser Brenner (13) in einer innerhalb dieser Stopfenstange gebildeten Kammer (15) angeordnet ist und daß das untere Ende dieser Stopfenstange (12) von mindestens einem mit jener Kammer (15) in Verbindung stehenden Kanal (18) durchsetzt ist.
  3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß sich die Kammer (15) in Längsrichtung der Stopfenstange und koaxial damit erstreckt und daß der Brenner (13) den oberen Teil der Kammer (15) einnimmt, so daß diese somit im Bereich des unteren Endes der Stopfenstange (12) ein freies Volumen (17) aufweist.
  4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß einerseits der Brenner (13) und andererseits der das untere Ende der Stopfenstange durchsetzende Kanal (18) in das freie Volumen (17) münden.
  5. Einrichtung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß der Brenner (13) im Bereich seines Auslaßendes mit Mitteln (20) zum Zentrieren und/oder Abdichten in jener Kammer (15) versehen ist.
  6. Einrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß dieser Kanal (18) ein mit der Stopfenstange (12) koaxiales Segment mit einem kleineren Durchmesser als der der Kammer (15) einschließt.
  7. Einrichtung nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß am unteren Ende der Stopfenstange (12) mehrere seitliche Auslaßkanäle (19) vorgesehen sind, welche jenen axialen Kanal umgeben und daraus unter geeigneten Winkeln austreten.
  8. Einrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß um das untere Ende des Rohrs aus feuerfestem Material bzw. der Stopfenstange eine Muffe (23) vorgesehen ist.
  9. Einrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Abstand H zwischen dem Boden (1) des metallurgischen Behälters und dem Auslaß des Brenners (13) zwischen 300 mm und 600 mm liegt.
  10. Einrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Abstand h zwischen dem Boden (1) des metallurgischen Behälters und dem unteren Ende des Rohrs aus feuerfestem Material bzw. der Stopfenstange (12) weniger als 50 mm beträgt.
EP90870094A 1989-06-27 1990-06-19 Vorrichtung zum Vorheizen einer Giessdüse für geschmolzenes Metall und mit dieser Vorrichtung ausgerüstete Metallgiesseinrichtung Expired - Lifetime EP0406208B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8900702A BE1004282A6 (fr) 1989-06-27 1989-06-27 Dispositif de prechauffage d'une busette de coulee d'un metal en fusion et installation de coulee d'un metal equipee de ce dispositif.
BE8900702 1989-06-27

Publications (2)

Publication Number Publication Date
EP0406208A1 EP0406208A1 (de) 1991-01-02
EP0406208B1 true EP0406208B1 (de) 1994-08-10

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EP90870094A Expired - Lifetime EP0406208B1 (de) 1989-06-27 1990-06-19 Vorrichtung zum Vorheizen einer Giessdüse für geschmolzenes Metall und mit dieser Vorrichtung ausgerüstete Metallgiesseinrichtung

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EP (1) EP0406208B1 (de)
AT (1) ATE109700T1 (de)
BE (1) BE1004282A6 (de)
DE (1) DE69011436T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004612A6 (fr) * 1991-01-16 1992-12-22 Centre Rech Metallurgique Dispositif de prechauffage d'une busette de coulee d'un metal en fusion.
FR2689208B1 (fr) * 1992-03-25 1994-05-27 Olifan Vibracim Sa Dispositif d'isolation thermique.
CN103934445A (zh) * 2014-04-09 2014-07-23 张家港联峰钢铁研究所有限公司 一种浸入式水口冷却装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2475777A (en) * 1945-09-24 1949-07-12 Brown Edward Heater for nozzle holes in steel ladles
DE3437810A1 (de) * 1984-10-16 1986-04-24 Kortec AG, Zug Verschlusseinrichtung fuer eine abstichoeffnung im boden eines metallurgischen gefaesses
FR2611151B1 (fr) * 1987-02-20 1991-06-14 Daussan & Co Dispositif de prechauffage et/ou d'obturation et de debouchage d'un orifice de coulee et procede pour sa mise en oeuvre

Also Published As

Publication number Publication date
BE1004282A6 (fr) 1992-10-27
DE69011436D1 (de) 1994-09-15
ATE109700T1 (de) 1994-08-15
EP0406208A1 (de) 1991-01-02
DE69011436T2 (de) 1995-05-24

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