EP3419778B1 - Ensemble de rangées de buses et champ de buses destinés à être montés dans des fentes situées entre deux rouleaux de corset de guidage - Google Patents

Ensemble de rangées de buses et champ de buses destinés à être montés dans des fentes situées entre deux rouleaux de corset de guidage Download PDF

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Publication number
EP3419778B1
EP3419778B1 EP17706475.5A EP17706475A EP3419778B1 EP 3419778 B1 EP3419778 B1 EP 3419778B1 EP 17706475 A EP17706475 A EP 17706475A EP 3419778 B1 EP3419778 B1 EP 3419778B1
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EP
European Patent Office
Prior art keywords
nozzle
nozzles
roller gap
row arrangement
substance
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.)
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Application number
EP17706475.5A
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German (de)
English (en)
Other versions
EP3419778A1 (fr
Inventor
Axel Weyer
Jürgen Friedrich
Dirk Letzel
Stephan Six
Andreas Naujock
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.)
SMS Group GmbH
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SMS Group GmbH
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting

Definitions

  • the invention relates to a nozzle row arrangement for installation in a roller gap between two adjacent in a casting direction strand guide rollers in a strand guide in a continuous casting.
  • the continuous casting plant is used for pouring liquid metal into a cast strand, which is guided within the strand guide between strand guide rollers.
  • the nozzle array consists of a plurality of nozzles for applying coolant to the casting strand.
  • the invention further relates to a nozzle array which is a plurality of nozzle array arrays disposed in a plurality of roll nips in the strand guide.
  • coolant nozzles In the prior art series arrangements of coolant nozzles are well known, such. B. from the German patent application DE 10 2009 005 679 A1 , There it is mentioned that the nozzles can be either 1-fluid nozzles or 2-fluid nozzles per roller gap. As the labels indicate, in the 1-material nozzles only a single coolant is applied to the casting strand, while the 2-material nozzles are designed to mix two coolants, typically air and water, previously mixed in a mixing chamber were sprayed onto the cast strand.
  • German Auslegeschrift 26 36 666 discloses nozzles for coolant in a series arrangement, wherein the nozzles are arranged there symmetrically to a plant center or strand central axis of the strand guide.
  • a continuous casting plant typically comprises a mold and a strand guide arranged downstream of the mold in the casting direction, with a plurality of strand guide rolls. After liquid metal, in particular liquid steel was filled into the mold, it is at the edges of the mold by means of a Cooled primary cooling, so that there forms a cast strand with initially still liquid core but already solidified stable strand shell within the mold. After the cast strand leaves the mold with a viable shell, it is guided within the downstream strand guide and cooled until it is finally completely solidified.
  • the guide within the strand guide takes place between opposite strand guide rollers, wherein the casting strand is typically bent from the vertical to the horizontal.
  • the cooling of the casting strand in the strand guide takes place with the said nozzle row arrangements between the roller gaps.
  • 2-fluid nozzles are used only in certain cases, namely in particular where the ejected from the nozzle coolant flow in a wide control range, hereinafter also called control ratio, must be adjustable. This requirement may arise in particular if the continuous casting plant is designed for a large product range, ie for the casting of casting strands of quite different widths or different steel grades with greatly varying casting speeds.
  • 1-fluid nozzles in contrast to 2-fluid nozzles in their control ratio significantly more limited, and therefore they are not suitable for installation in continuous casters, which are designed for a wide range of products, at least alone.
  • the invention has the object of developing a known nozzle array and a known nozzle array for installation in roller gaps between strand guide rollers to the effect that on the one hand to improve the quality of the cast strand, but on the other hand are more cost-effective.
  • the nozzle array arrangements according to the invention are characterized in that the further nozzles as Multi-substance nozzles are formed whose control ratio is greater than the control ratio of the at least one 1-substance nozzle.
  • a multi-substance nozzle preferably means a 2-material nozzle, which typically with a gaseous material M2, z. As air or nitrogen, and in addition with a liquid M1, z. B. be operated with water.
  • control ratio also called control range
  • control range of a nozzle indicates how far the volume flow of the coolant can be lowered in relation to a nozzle-specific nominal or maximum value specified by the manufacturer, without the spray pattern or jet cone suffering substantially or even collapsing.
  • the claimed nozzle row arrangement provides that in a central region of the roller gap only 1-fluid nozzles are installed, while right and left of the central region, d. H. in the edge regions of the casting strand multi-component nozzles are installed. Due to the sprayed from the multi-component nozzle coolant mixture of, for example, a gaseous and a liquid coolant, the control range of the multi-fluid nozzles is typically significantly larger than the control range of the 1-fluid nozzles. However, the purchase and operation of the multi-component nozzles are significantly more expensive than the operation of the 1-fluid nozzles, because the provision of the gaseous coolant, for. B. compressed air is many times more expensive than the provision of water as a coolant.
  • the multi-component nozzles which are expensive in their operation are arranged only in the edge region of the cast strand and not in its middle region, the operating costs are significantly lower compared to a nozzle row arrangement equipped with multi-component nozzles.
  • the quality of a cast strand and in particular its surface is not limited by the fact that in the central area only in the purchase as well as in maintenance inexpensive 1-fluid nozzles are used.
  • the claimed nozzle row arrangement is preferably used in continuous casting plants with the following specifics: Plant forms: Vertical bending, bow and vertical slab plants Slab widths: 1000 - 4000 mm Slab thicknesses: 40 - 700 mm casting speeds: 0.1-10 m / min Strand guide Length: 1 - 50 m Nozzle distance to the slab: 50-1000 mm Spray angle Width: 30 - 160 degrees Spray angle Depth: 1 - 120 degrees Single Media: Water, air, nitrogen Mixture Media: Water / air; Water / nitrogen water impingement: 1 - 100 l / (m 2 ⁇ s) Heat transfer coefficient: 300 - 60,000 W / (m 2 ⁇ K); Heat-Temperature-Coefficient HTC
  • the nozzle row arrangement according to the invention can be used for cooling the upper side or the lower side of a cast strand.
  • the above object of the invention is further achieved by a nozzle field for installation in roller gaps between a plurality of strand guide rollers arranged adjacent in the casting direction according to claim 5.
  • the advantages of this solution correspond to the advantages mentioned above with respect to the nozzle row arrangement.
  • the entire spray width decreases from outside to inside in the casting direction.
  • Such a configuration of the rows of nozzles in the nozzle fields is therefore possible and useful, because generally the required cooling capacity decreases in the casting direction with increasing through solidification.
  • both acquisition and operating costs can be advantageously saved.
  • the number of nozzles does not have to be reduced from each roller gap to the subsequent roller gap immediately adjacent in the casting direction. Rather, several successive in the casting direction roller gaps can be the same Having a number of nozzles, and only - the plurality of roller columns - downstream roller gaps then have a reduced number of nozzles.
  • the terms first and second roll nip are not necessarily to be understood as adjacent roll nips.
  • FIG. 1 shows a classic continuous casting plant 200, which consists essentially of a continuous casting mold 250 and a strand guide 210 downstream of the continuous casting mold.
  • a bath level 252 forms within the mold.
  • the liquid metal is cooled in the mold 250 by means of a primary cooling (not shown) so that a cast strand 300 is formed there.
  • the cast strand is initially fluid in its interior; However, it forms on its outside a solidified solid strand shell 310.
  • the guided tour takes place in FIG. 1 from top to bottom, ie here in the casting direction R.
  • the cast strand 300 is supplied with coolant (secondary cooling). This is done with the aid of nozzles which are arranged in the form of nozzle row arrangements 100 in the roller gaps 212 between two strand guide rollers 214 which are adjacent in the casting direction R. As a result of the application of coolant, the cast strand 300 solidifies continuously during its guidance through the strand guide 210, until it finally completely solidifies.
  • coolant secondary cooling
  • FIG. 2 shows a cross section through a roller gap 212. It can be seen the cast strand 300 in teilerstarrtem state, ie with a solidified strand shell 310 and a still liquid core 320. Above the cast strand, the nozzle array 100 can be seen. Specifically, in the example shown here, the nozzle row arrangement comprises four 1-substance nozzles 110 which are each operated only with a liquid cooling medium M1, typically water. All four 1-fluid nozzles are preferably designed for the same maximum HTC value, ie for the same maximum cooling capacity. In simple terms, this means that all 1-substance nozzles apply the same amount of liquid per unit of time to the cast strand 300 to be cooled.
  • a liquid cooling medium M1 typically water
  • the strand guide is configured to guide the casting strand 300 with format widths between a minimum format width and a maximum format width.
  • the arrangement of the 1-substance nozzles is limited to the center region G.
  • For the width of the central region G according to the present invention applies: 100 mm ⁇ width of center area G ⁇ minimum width of width of strand guide.
  • the center region G extends symmetrically with respect to a plant center G0 of the strand guide 210 in the roll gap 212.
  • the 1-substance nozzles 110 are also arranged within the center region G symmetrically to the plant center G0 in the roll gap 212.
  • each a 2-material nozzle 120 arranged as a multi-component nozzle within the nozzle row assembly 100 is here for example each a 2-material nozzle 120 arranged as a multi-component nozzle within the nozzle row assembly 100.
  • the 2-material nozzle is operated with two coolants M1, M2.
  • the first coolant M1 is typically liquid, eg water.
  • the second coolant M2 is typically gaseous, eg air.
  • their control range is much larger. This is particularly advantageous because it allows a finer or demand-oriented adjustment of the cooling capacity in the edge regions of the cast strand.
  • FIG. 2 can be clearly seen, give the 2-fluid nozzles 120 only a significantly smaller amount of liquid coolant per unit time on the cast strand.
  • the overall cooling capacity of the 2-substance nozzles in the edge regions is, as a rule, deliberately set much lower than that of the 1-material nozzles 110 in the central region G to be provided cooling capacity. This is because, as stated, the edge portions of the cast strand 300 must be "kept warm” to avoid cracking. Therefore, the 2-material nozzles provided for the edge region may also be designed for a smaller maximum HTC value than the remaining nozzles of the nozzle row.
  • FIG. 3 illustrates the different control ratios of 1-fluid and 2-fluid nozzles. If both nozzles are designed for the same maximum cooling capacity (Heat-Temperature-Coefficient HTC), the 2-material nozzle advantageously enables, unlike the 1-material nozzle, the setting of significantly lower cooling capacities than the 1-material nozzle. Jet. Based on these Feature recommend 2-fluid nozzle for use in continuous casting, which are designed for a wide range of different grades of steel.
  • HTC Heat-Temperature-Coefficient
  • a specific cooling output specified by the manufacturer corresponding approximately to a predetermined maximum volume flow of liquid coolant
  • a control ratio of, for example, 1: 6 are specified. This means that the volume flow of, for example, a maximum of 6 L / min should be lowered to 1 L / min, without the spray cone and the spray pattern of the nozzle would suffer significantly.
  • the present invention shows that it is sufficient if these expensive 2-fluid nozzles are used in their operation only in the edge regions and not over the entire width of the roller gap.
  • FIG. 4 shows a nozzle array according to the invention, which consists of a plurality of nozzle array arrangements.
  • the nozzle field 400 comprises a first nozzle row arrangement 100-1 in a first roll gap 212 and a second nozzle row arrangement 100-2 in a second roll gap, which in FIG FIG. 4 downstream of the first roller gap in the casting direction R.
  • FIG. 4 shows nozzle array 5 rows of nozzles, wherein, by way of example, the first, second and third nozzle row arrangement according to the present Invention are formed. In concrete terms, this is shown by the fact that these first three nozzle row arrangements have only 1-material nozzles within the center region G and 2-material nozzles 120 in their edge regions.
  • the total spray width B of all the nozzles 110, 120, 120 'per roll gap 212 in the casting direction R can also become increasingly smaller. As the total spray width becomes smaller, the number of nozzles per roller gap decreases from outside to inside, as in FIG. 4 can be seen.
  • the decrease in the number of nozzles per roller gap for example, finally goes so far that in the fourth roller gap only three 1-fluid nozzles and in a fifth roller gap finally only a 1-fluid nozzle in the central region G are arranged / is ,
  • the nozzle row arrangements in the fourth and fifth roll gaps no longer correspond to the nozzle row arrangement according to the present invention, because right and left outside of the central area G, no 2-substance nozzles are arranged any more.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Nozzles (AREA)

Claims (7)

  1. Agencement de buses montées en série (100) pour son incorporation dans une emprise de rouleaux (212) entre deux rouleaux de guidage de barre (214) adjacents dans une direction de coulée (R) dans un guidage de barre (210) d'une installation de coulée continue (200), présentant :
    au moins une buse destinée à une seule matière (110) comprenant un premier rapport de régulation, disposée dans une zone médiane (G) de l'emprise de rouleaux (212), respectivement au moins une buse supplémentaire (120) disposée - lorsqu'on regarde dans la direction de coulée - à droite et à gauche de la zone médiane dans l'emprise de rouleaux; dans lequel ladite au moins une buse destinée à une seule matière ainsi que les buses supplémentaires sont réalisées pour l'application d'agents de refroidissement (M1, M2) sur une barre de coulée (300) est guidée par les rouleaux de guidage de barre (214) ; caractérisé en ce que les buses supplémentaires (120) sont réalisés sous la forme de buses destinées à plusieurs matières comprenant respectivement un deuxième rapport de régulation ; et en ce que le premier rapport de régulation est inférieur au deuxième rapport de régulation.
  2. Agencement de buses montées en série (100) selon la revendication 1, caractérisé en ce que le guidage de barre (210) est réalisé à des fins de guidage de barres de coulée (300) possédant des largeurs de formats entre une largeur de format minimale et une largeur de format maximale ; et en ce qui concerne la largeur de la zone médiane, est valable ce qui suit : 100 mm < largeur de la zone médiane (G) < largeur de format minimale du guidage de barre.
  3. Agencement de buses montées en série (100) selon l'une quelconque des revendications précédentes, caractérisé en ce que la zone médiane (G) s'étend en position symétrique par rapport à un milieu d'installation (G0) du guidage de barre (210) dans l'emprise de rouleaux; et ladite au moins une buse destinée à une seule matière (110) et les buses (120) destinées à plusieurs matières sont disposées en position symétrique par rapport au milieu de l'installation (G0) dans l'emprise de rouleaux (212).
  4. Agencement de buses montées en série (100) selon la revendication 1, caractérisé en ce que, lorsque respectivement deux buses destinées à plusieurs matières (120) ou plus sont disposées à droite et à gauche de la zone médiane (G) - en dehors des deux buses les plus externes (120') destinées à plusieurs matières qui recouvrent avec leur zone de pulvérisation également le bord droit et le bord gauche de la barre de coulée respective - toutes les autres buses (120) destinées à plusieurs matières sont dimensionnées pour la même valeur HTC (Heat-Temperature-Coefficient) maximale, au même titre que ladite au moins une buse destinée à une seule matière (110) dans la zone médiane (G).
  5. Champ de buses (300) pour son incorporation dans l'emprise de rouleaux (212) entre une multitude de rouleaux de guidage de barre (214) disposés en position adjacente dans la direction de coulée (R) dans un guidage de barre (210) d'une installation de coulée continue (200) ; dans lequel le champ de buses (300) présente :
    un premier agencement de buses montées en série (100-1) dans une première emprise de rouleaux, et un deuxième agencement de buses montées en série (100-2) dans une deuxième emprise de rouleaux qui est disposée à la suite de la première emprise de rouleaux dans la direction de coulée ; dans lequel ledit au moins un premier agencement de buses montées en série (100-1) est réalisé conformément à l'une quelconque des revendications précédentes.
  6. Champ de buses (300) selon la revendication 5, caractérisé en ce que, la largeur de pulvérisation totale (B) de l'ensemble des buses, par emprise de rouleaux, diminue dans la direction de coulée (R).
  7. Champ de buses (300) selon la revendication 6, caractérisé en ce que le nombre des buses, par emprise de rouleaux, diminue depuis l'extérieur vers l'intérieur dans la direction de coulée.
EP17706475.5A 2016-02-24 2017-02-21 Ensemble de rangées de buses et champ de buses destinés à être montés dans des fentes situées entre deux rouleaux de corset de guidage Active EP3419778B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016202880 2016-02-24
DE102016215977.1A DE102016215977A1 (de) 2016-02-24 2016-08-25 Düsenreihenanordnung und Düsenfeld zum Einbau in Rollenspalte zwischen zwei Strangführungsrollen
PCT/EP2017/053961 WO2017144481A1 (fr) 2016-02-24 2017-02-21 Ensemble de rangées de buses et champ de buses destinés à être montés dans des fentes situées entre deux rouleaux de corset de guidage

Publications (2)

Publication Number Publication Date
EP3419778A1 EP3419778A1 (fr) 2019-01-02
EP3419778B1 true EP3419778B1 (fr) 2019-08-07

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EP17706475.5A Active EP3419778B1 (fr) 2016-02-24 2017-02-21 Ensemble de rangées de buses et champ de buses destinés à être montés dans des fentes situées entre deux rouleaux de corset de guidage

Country Status (3)

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EP (1) EP3419778B1 (fr)
DE (1) DE102016215977A1 (fr)
WO (1) WO2017144481A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107983926A (zh) * 2017-12-29 2018-05-04 南京钢铁股份有限公司 一种方坯连铸机二冷喷嘴及其布置方法
DE102019207789A1 (de) 2019-05-28 2020-12-03 Sms Group Gmbh Verfahren und Vorrichtung zum Stranggießen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2636666C2 (de) 1976-08-14 1978-06-29 Demag Ag, 4100 Duisburg Spritzdüsen-Anordnung für Metall-, insbesondere für StahlstranggieBanlagen für extrem breite Stahlbrammen
DE102008004911A1 (de) * 2008-01-18 2009-07-23 Sms Demag Ag Verfahren zur Regelung der Sekundärkühlung von Stranggießanlagen
DE102009010251A1 (de) * 2008-10-01 2010-04-08 Sms Siemag Aktiengesellschaft Vorrichtung und Verfahren zur Sekundärkühlung in einer Stranggießanlage
DE102009005679A1 (de) 2009-01-22 2010-07-29 Sms Siemag Aktiengesellschaft Stranggießanlage mit Spritzdüsenanordnung
DE102009034847A1 (de) * 2009-07-27 2011-02-03 Sms Siemag Ag Vorrichtung und Verfahren zur geregelten Sekundärkühlung einer Stranggießanlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Publication number Publication date
EP3419778A1 (fr) 2019-01-02
WO2017144481A1 (fr) 2017-08-31
DE102016215977A1 (de) 2017-08-24

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