EP3613518B1 - Dispositif de retrait sans scorie de l'acier liquide du distributeur ou de la cuve à l'aide du système deflux - Google Patents

Dispositif de retrait sans scorie de l'acier liquide du distributeur ou de la cuve à l'aide du système deflux Download PDF

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Publication number
EP3613518B1
EP3613518B1 EP19187052.6A EP19187052A EP3613518B1 EP 3613518 B1 EP3613518 B1 EP 3613518B1 EP 19187052 A EP19187052 A EP 19187052A EP 3613518 B1 EP3613518 B1 EP 3613518B1
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Prior art keywords
plate
plates
tip
bottom drain
liquid steel
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EP19187052.6A
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German (de)
English (en)
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EP3613518A1 (fr
Inventor
Veronica Stilkerieg
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/118—Refining the metal by circulating the metal under, over or around weirs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • 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
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • F27D3/159—Equipment for removing or retaining slag for retaining slag during the pouring of the metal or retaining metal during the pouring of the slag

Definitions

  • the invention relates to a device consisting of a tundish or a ladle with a bottom outlet provided in its bottom, with the bottom outlet being assigned to the plate-shaped fittings made of refractory material that influence the vortex that occurs when it is opened, for low-slag removal of the liquid steel from the tundish or the ladle, which over a vertical braking part in the form of a plate and having a base corresponding to a recess in the floor, the plate having a sharp edge facing the floor outlet, maintaining a predetermined distance, pointing towards the floor outlet and at a predetermined angle to the stopper or a starter tube located in the floor drain.
  • a more or less strong axial laminar flow occurs, i.e. a whirlpool, which entrains the liquid slag located above the liquid steel into the removed steel and then unsubscribes.
  • the proportion of slag in this whirlpool can reach considerable amounts because the whirlpool almost always penetrates to the surface of the melt. This danger exists above all when the bath level in the ladle or tundish reaches a low level towards the end of the pouring and the eddy formation can therefore reach the surface very quickly.
  • Re 35,597 provides a cross of ramparts in the area of the spout, which results in a kind of vortex brake in the spout. Concreting is also planned here.
  • the EP 1 866 111 B1 describes for the first time a plate-shaped built-in part made of refractory material, which is designed and arranged in such a way that it early divides the vortex that is produced in the area of the bottom outlet. The edge of this plate facing the bottom outlet is sharpened in order to "push" into the whirlpool better.
  • This part of the plate ie the vertically upstanding part, has a shark fin shape. With regard to the angle of attack, it is only mentioned that an additional crushing effect should occur due to the angle to the tamping.
  • the known plate or the so-called vortex breaker works in principle, although if the angle of attack is not correct, additional vortices can arise, which again make it even more difficult to discharge the steel.
  • the vortex brake described works very inadequately, if at all.
  • Such plates are used to break up the resulting eddies.
  • the plate or several plates are assigned to a circular fixing part surrounding the floor outlet, the plates not being connected to the fixing part but to an adapter plate via a base, the mounting base having a shape that allows insertion into an opening in the adapter plate is designed to enable.
  • the plate or plates After inserting this mounting foot, it is glued in the opening.
  • the correct arrangement of the plate or plates is therefore only possible via the circular fixing part, with a perforated stone also being used, which is placed on the drain hole and on which the fixing parts or the ring can be placed.
  • the plates used are rectangular and do not have a specially designed foot.
  • the DE 10 2008 016 621 A1 shows an anti-vortex device with a sharp edge plate.
  • the plate has a shark fin shape and has differently designed feet. They are plate-shaped, cone-shaped or pyramid-shaped and, after being inserted into a correspondingly shaped opening in the bottom of the vessel, are glued to ensure a secure fit.
  • the plates themselves do not have any special design.
  • the DE 20 2005 005 229 U1 corresponds to the discussed documents on the state of the art. Plates protruding at right angles from the foot area of the plate are specified for the base. In addition, this well-known version also has plates with sharp edges and an overall shark fin shape, which is supposed to break the eddy safely. As with all of the described designs, with this vortex crusher the discharge of slag is not guaranteed over the entire period of emptying the container or is dependent on the precise conditions for which the so-called vortex crusher was formed being present.
  • the invention is therefore based on the object of further minimizing the co-discharge of slag, the shape of the plate being special Optimally adapt to the circumstances of the ladle or distributor and enable the use of the vortex-breaking plates even with starter pipes.
  • the braking part which is designed as a plate, has a straight side flank and a side flank which runs obliquely to the longitudinal axis of the plate, the straight side flank running right through to the tip of the sharp edge, while the side flank which runs obliquely and thus widens the plate ending at a distance of 5.5-2.5 mm in front of the tip and then sloping towards the tip.
  • a flow leading to the bottom outlet and a flow leading away from it can be generated with the help of the plate. With the help of such a plate or a vortex breaker, it is first of all ensured that the plate remains stable until almost the end of the removal of the liquid phase through the bottom outlet.
  • a secure seat or hold of the plate in the base of the pan or distributor is ensured by the fact that the base has a rectangular shape and a free height of 50 to 80 mm, which is selected according to the depth of the recess in the base.
  • the plate can thus neither twisted nor turned off be pulled out from the bottom when the liquid steel flows against the plate and is acted upon by the attempted eddy formation.
  • the prior art only speaks of an angle at which the plate is to be arranged. This is imprecise information for the person skilled in the art, so that it is to be regarded as advantageous that the plate according to the invention should have an angle of 10-30 degrees to the bottom outlet. This incline guarantees targeted intervention in the resulting whirlpool, so that there is almost no whirlpool formation or only lateral side currents, which are completely harmless and cannot adversely affect the outflow of liquid steel through the bottom outlet. If the plate is placed almost straight to the bottom outlet, additional vortices are so large that the desired effect cannot be achieved. So the above angle is very important.
  • the plate obtains a particularly favorable position when it is arranged connected to the bottom at the outer edge of the bottom outlet opposite to the eddy direction in front of the bottom outlet. This means that it is positioned at the intended angle of 10 to 30 degrees and then at the same time is not positioned in the middle of the bottom outlet but rather “leaning" on the outer edge in order to prevent the oncoming liquid steel from creating a disadvantageous vortex generate. It is important that the plate is arranged against the direction of the vortex, namely with its sharp edge.
  • starter tubes are lightweight, refractory tubes that are placed on top of the sink/bottom spout to prevent contaminants from entering the first downflow steel. These components usually have a diameter of 10 cm and are about 20 cm high. After reaching the height of the steel bath of approx. 20 cm, the starter tubes dissolve, so that the plates would still have to be used to prevent the vortex, but this cannot be achieved with a plate. The height of the steel bath is still reduced to 7 or less centimetres, ie liquid steel continues to be drawn off even if the starter tubes are no longer available. These starter pipes are thick-walled so that the plates cannot be pushed sufficiently close to the bottom outlet.
  • the formation of vortices can also be reliably prevented if, preferably in the presence of a starter pipe, two plates forming a funnel for the outflowing steel are arranged at an angle of 20 - 45 degrees to the longitudinal axis of the ladle or distributor with the tip pointing towards the bottom outlet.
  • This arrangement of the two plates ensures that the outflowing steel is guided to the bottom outlet, with turbulence possibly occurring in the corner areas of the ladle or the distributor, but these are harmless for guiding the liquid steel. This effectively prevents the two plates from creating harmful vortices even when starter tubes are used, even when the starter tubes have been dissolved by the liquid steel.
  • both plates are arranged with the sharp edge and thus the tip pointing towards the bottom outlet with the same angle of attack. They should also be fixed the same distance from the bottom outlet so that a very smooth funnel is formed which can safely guide the liquid steel towards the bottom outlet without any vortex formation in the first place. It should be mentioned once again that the small vortices that form in the corners cannot influence the outflow of the liquid steel.
  • a fine adjustment is achieved when the tip is aimed at the outer edge of the starter tube.
  • the liquid steel is guided through the funnel towards the bottom outlet and on the other hand, of course, there is a Flow around the plates, which leads back to the bottom outlet, so that the steel can flow out evenly through the bottom outlet.
  • Another way to positively influence the flow in the area of the bottom outlet is to fix both plates with their tips at least to the middle of the starter tube and a distance of less than 30 mm to the bottom.
  • the figures to be explained later make it clear how a targeted and “gentle” guidance of the liquid steel is achieved in this way.
  • the funnel formed by the plates is formed in the longitudinal axis of the ladle or the distributor with the funnel end pointing towards the bottom outlet.
  • the two plates are aligned accordingly and produce a flow in which liquid steel is fed into the bottom outlet without the formation of eddies.
  • the arrangement of the two plates to form a funnel can be changed if there is a major change in the flow rate of the outflowing liquid steel, if the ladle or the inside diameter of the base outlet changes, or if the geometry of the base changes.
  • Such changes in the arrangement of the two plates are possible, for example, if the recess in the floor, which is made up of individual stones, is selected resulting in a different angle of attack. It is only necessary to replace one or two stones in the ground to create the changed angle of attack. Another possibility is to slightly change the shape of the two plates in order to influence the flow of the liquid steel differently.
  • the invention is characterized in particular by the fact that plates which are suitable for use with plugs and also with starter pipes and positively influence the flow within the pan or the distributor are created.
  • she have a shape that specifically prevents the formation of eddies and allows the liquid steel to be guided, which enables the liquid steel to be drawn off from the ladle or from the distributor almost to the overlying layer of ash.
  • the bear remaining in the pan or the distributor is thus as small as possible.
  • this shape of the plate makes it possible to reliably prevent the formation of disadvantageous vortices, even when starting tubes are used, with two identical plates being used, which are set up at a certain angle and thus form a kind of funnel that conveys the liquid Steel directed towards the bottom outlet without giving it the opportunity to create detrimental vortices.
  • FIG 1 shows an arrangement with a ladle 1 in which liquid steel 5 is held. From this ladle 1, the liquid steel is fed into the distributor 2, in order to be fed to the further processing points here in a targeted manner will.
  • This distributor 2 or also a pan 43 reproduced later have several bottom outlets 3 which are initially closed by a plug 14 .
  • this plug 14 is pulled up so that the liquid steel can flow via the bottom outlet 3 in the direction of the casting mold 7 and rollers 8 .
  • a whirlpool 4 is created above the floor 9 , which draws off the liquid ash 55 with the liquid steel 5 via the floor outlet 3 .
  • plate-shaped internals 6 have the shape of a plate 20 and consist of a braking part 10 and a base 11.
  • the front edge is designed as a sharp edge 12.
  • FIG 2 shows a ladle 43 in which liquid steel 5, which is also supplied via the shroud tube 13, is held available, in order to then be supplied for further use via the bottom outlets 3, 3'.
  • Such pans 43 are designed to be slightly tiltable under certain circumstances in order to achieve further discharge of liquid steel 5 when the liquid steel 5 is almost discharged.
  • figure 3 shows a top view or bottom view of a plate 20, where it can be seen that in addition to the tips 35, which are designed to be quite stable, the opposite edge 17 has a narrowing, which enables the liquid steel 5 to be guided more favorably.
  • the plate 20 shown has a rectangular base 11 which, with the foot area, contributes to the stabilization of the area in order to ensure that the plate 20 is positioned securely.
  • figure 4 shows a head-on view of the plate 20, with the base 11 being visible at the bottom, while the inner flank is denoted by 46, which has a concave configuration (27) here. This ensures that the flow of liquid steel 5 is guided calmly but in a targeted manner.
  • a pan 43 is shown from above figure 5 . It is indicated that a bottom outlet 3 at the end of the pan 43, as from figure 2 can be seen, is arranged so that the liquid steel 5 filled in the middle has to flow in the direction of the bottom outlet 3 .
  • the plate 20 arranged near the bottom outlet 3 guides the liquid steel 5 in such a way that there is an inflowing stream of steel 47 and an outflowing steel stream 48, with the majority of course through the bottom outlet 3 to the distributor 2 or to the Mold 7 flows.
  • the plate 20 with its tip 35 is arranged with a certain angle of attack, which is defined in the claim, so that the already mentioned steel flows 47, 48 result.
  • small vortices arise, but they are completely harmless and are denoted by 49. Overall, the flow is calm so that harmful vortices cannot arise.
  • FIG 7 clarifies more clearly how it is expediently with the guidance of the liquid steel 5 in the case of starter tubes 15 .
  • It will be two Plates 20 / 41, 42 are used in such a way that they form a funnel 40 which feeds the incoming liquid steel 5 precisely onto the bottom outlet 3.
  • the edges 12 having the tip 35 are arranged in such a way that they extend beyond the center 22 and are closely spaced to the outer edge 38 of the starter tube 15 .
  • the angle of attack 37 for both plates 41, 42 is defined as described in the claims and ensures that a funnel end 45 results, which ensures that the liquid steel 5 is optimally fed into the bottom outlet 3.
  • the angle of attack 37 described relates to the longitudinal axis 44 of the pan 43.
  • figure 8 shows once again a top view of a pan 43, in which, similarly to FIG figure 7 the position of the two plates 41, 42 is shown. It can be seen that the entire stream 50 moves towards the bottom outlet 3 and is guided by the two plates 41, 42 in such a way that the funnel 40 with the funnel end 45 is created and in the corner areas the stream 50 is diverted to the bottom outlet 3 to.
  • the small vortices that form in the corners 51 are harmless.
  • two plates 41, 42 are provided in order to be able to feed the liquid steel 5 to the bottom outlet 3 in a targeted and smooth flow.
  • the bottom outlet 3 is secured almost the entire time by a so-called starter pipe 15 in such a way that the steel 5 is guided at least once over the upper edge of the starter pipe 15 and downwards through the bottom outlet 3 . All of this happens in a targeted manner and in a calm state, so that harmful vortices cannot even arise.
  • What is essential in this overall design is that the shape of the plates 20/41, 42 ensures that the liquid steel 5 is guided smoothly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Blast Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Claims (9)

  1. Dispositif consistant en un distributeur (2) ou une poêle (43) dans le fond (9) duquel est prévu un écoulement de fond (3) et dont, afin de prélever l'acier liquide avec peu de scories (5) du distributeur (2) ou de la poêle (43), l'écoulement de fond (3) a été pourvu de pièces en matériau réfractaire incorporées en forme de plaque (6) agissant sur le tourbillon (4) qui apparaît à l'ouverture, qui sont réalisées en disposant d'une pièce de frein (10) verticale en forme de plaque (20) et d'un pied (11) correspondant avec une réservation (19) dans le fond (9), dans lequel la plaque (20) présente un bord coupant (12) tourné vers l'écoulement de fond (3) respectant une distance prescrite et orienté vers l'écoulement de fond (3) et est disposée dans un angle prescrit par rapport au bouchon (14) ou à un tuyau de démarrage (15) dans l'écoulement de fond (3),
    caractérisé en ce que
    la pièce de frein (10) réalisée sous forme de plaque (20) présente un axe latéral (32, 34) suivant un parcours droit et un parcours oblique par rapport à l'axe longitudinal de la plaque (33), le flanc suivant un parcours droit (32) étant étiré jusqu'à la pointe (35) du bord coupant (12), tandis que le flanc latéral est réalisé en suivant un parcours oblique (34) en élargissant ainsi la plaque (20) en terminant à une distance de 5,5-2,5 cm avant la pointe (35) et en amenant en biais sur la pointe (35).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    le pied (11) présente une forme rectangulaire et une hauteur libre (26) de 50 à 80 mm, qui est choisie en fonction de la profondeur de la réservation (19) dans le fond (9).
  3. Dispositif selon la revendication 1,
    caractérisé en ce que
    la plaque (20) présente une incidence (37) de 10-30 degrés par rapport à l'écoulement de fond (3).
  4. Dispositif selon la revendication 3,
    caractérisé en ce que
    la plaque (20) est disposée en étant reliée au fond (9) dans le sens contraire à celui du tourbillon (50) par rapport au bord extérieur (38) de l'écoulement de sol (3) avant l'écoulement de fond (3).
  5. Dispositif selon la revendication 1,
    caractérisé en ce que
    en cas de présence d'un tuyau de démarrage (15), deux plaques (20, 41, 42) formant un entonnoir (40) pour l'acier s'écoulant (5) sont disposées dans une incidence (37) de 20 à 45 degrés par rapport à l'axe longitudinal (44) de la poêle (43) avec la pointe (35) orientée vers l'écoulement de fond (3).
  6. Dispositif selon la revendication 5,
    caractérisé en ce que
    les deux plaques (41, 42) sont disposées avec le bord coupant (12) et par conséquent la pointe (35) orientés vers l'écoulement de fond (3) avec la même incidence (37).
  7. Dispositif selon la revendication 6,
    caractérisé en ce que
    la pointe (35) est orientée vers le bord extérieur (21) du tuyau de démarrage (15).
  8. Dispositif selon la revendication 6,
    caractérisé en ce que
    les deux plaques (41, 42) sont fixées au fond (9) avec leur pointe (35) allant au moins jusqu'au milieu (22) du tuyau de démarrage (15) et en conservant une distance inférieure à 30 mm.
  9. Dispositif selon la revendication 6,
    caractérisé en ce que
    la disposition des deux plaques (41, 42) peut être modifiée par rapport à un entonnoir (40) en cas de fort changement de la vitesse d'écoulement de l'acier liquide qui s'écoule (5), en cas de changement de la poêle (43) ou du diamètre intérieur de l'écoulement de fond, ou d'une modification de la géométrie du fond (9).
EP19187052.6A 2018-08-21 2019-07-18 Dispositif de retrait sans scorie de l'acier liquide du distributeur ou de la cuve à l'aide du système deflux Active EP3613518B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018120300.4A DE102018120300A1 (de) 2018-08-21 2018-08-21 Vorrichtung zum schlackearmen Entnehmen des flüssigen Stahls aus Verteiler oder Pfanne mit dem Deflux-System

Publications (2)

Publication Number Publication Date
EP3613518A1 EP3613518A1 (fr) 2020-02-26
EP3613518B1 true EP3613518B1 (fr) 2022-11-23

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Application Number Title Priority Date Filing Date
EP19187052.6A Active EP3613518B1 (fr) 2018-08-21 2019-07-18 Dispositif de retrait sans scorie de l'acier liquide du distributeur ou de la cuve à l'aide du système deflux

Country Status (4)

Country Link
EP (1) EP3613518B1 (fr)
DE (1) DE102018120300A1 (fr)
EA (1) EA038806B1 (fr)
UA (1) UA124895C2 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1866111B1 (fr) * 2005-03-31 2009-08-12 BKTEC Duroplastiche werkstoffe Gmbh Procede de prelevement avec peu de laitier d'acier liquide du distributeur ou de la poche de coulee lors de la production d'acier et brise-tourbillon correspondant

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE755850A (fr) 1969-09-09 1971-02-15 Kloeckner Werke Ag Procede et dispositif de coulee en continu d'aciers calmes a l'aluminium
BE781268A (fr) 1971-04-22 1972-07-17 Kloeckner Werke Ag Procede et dispositif pour la coulee continue
DE3444228C2 (de) 1984-11-30 1986-12-18 Mannesmann AG, 4000 Düsseldorf Verfahren und Vorrichtung zur Erzeugung einer gerichteten Strömung
US5196051A (en) 1991-07-19 1993-03-23 Premier Refractories And Chemicals Inc. Ladle and method for draining liquid metal with improved yield
US5171513A (en) 1992-05-12 1992-12-15 Usx Corporation Refractory article for preventing vortexing in a metallurgical vessel
DE10031361A1 (de) 2000-06-28 2002-01-10 Sms Demag Ag Verfahren und Vorrichtung zum schlackenfreien Abstechen einer Metall-, insbesondere einer Stahl-Schmelze, aus einem senkrecht stehenden metallurgischen Gefäß
DE202005005229U1 (de) * 2005-03-31 2005-08-04 Bktec Gmbh Vorrichtung zum schlackearmen Entnehmen des Flüssigstahls aus dem Verteiler bei der Stahlerzeugung
DE102005025317A1 (de) * 2005-03-31 2006-10-05 Bktec Duroplastische Werkstoffe Gmbh Verfahren zum schlackearmen Entnehmen des Flüssigkstahls aus Verteiler oder Pfanne bei der Stahlerzeugung
DE102008016621A1 (de) * 2008-04-01 2009-10-08 Stilkerieg, Berthold, Dipl.-Ing. Vorrichtung zum schlackenfreien Abstechen einer Stahlschmelze
DE102009009740A1 (de) * 2009-02-19 2010-08-26 Stilkerieg, Berthold, Dipl.-Ing. Vorrichtung zur Strudelvermeidung in metallurgischen Gefäßen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1866111B1 (fr) * 2005-03-31 2009-08-12 BKTEC Duroplastiche werkstoffe Gmbh Procede de prelevement avec peu de laitier d'acier liquide du distributeur ou de la poche de coulee lors de la production d'acier et brise-tourbillon correspondant

Also Published As

Publication number Publication date
UA124895C2 (uk) 2021-12-08
EA201991743A1 (ru) 2020-03-31
EP3613518A1 (fr) 2020-02-26
EA038806B1 (ru) 2021-10-22
DE102018120300A1 (de) 2020-03-26

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