WO2019101389A1 - Buse d'entrée immergée - Google Patents

Buse d'entrée immergée Download PDF

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Publication number
WO2019101389A1
WO2019101389A1 PCT/EP2018/075048 EP2018075048W WO2019101389A1 WO 2019101389 A1 WO2019101389 A1 WO 2019101389A1 EP 2018075048 W EP2018075048 W EP 2018075048W WO 2019101389 A1 WO2019101389 A1 WO 2019101389A1
Authority
WO
WIPO (PCT)
Prior art keywords
passageway
outlet ports
longitudinal axis
tubular body
protrusion
Prior art date
Application number
PCT/EP2018/075048
Other languages
English (en)
Inventor
Gerald Nitzl
Hans-Jürgen Haslinger
Original Assignee
Refractory Intellectual Property Gmbh & Co. Kg
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 Refractory Intellectual Property Gmbh & Co. Kg filed Critical Refractory Intellectual Property Gmbh & Co. Kg
Publication of WO2019101389A1 publication Critical patent/WO2019101389A1/fr

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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
    • B22D41/50—Pouring-nozzles
    • B22D41/507—Pouring-nozzles giving a rotating motion to the issuing molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl

Definitions

  • the present invention relates to a submerged entry nozzle, particularly to a submerged entry nozzle through which molten steel can be poured from a tundish into a mould.
  • submerged entry nozzles are generally comprised of a substantially tubular body extending from a first end to a second end of said tubular body.
  • submerged entry nozzles For conducting molten metal through said tubular body, submerged entry nozzles comprise a passageway, i.e. a bore, extending through said tubular body along a longitudinal axis from said first end towards said second end.
  • the nozzle For conducting molten metal from a tundish into said passageway, the nozzle comprises at least one inlet port, opening into said passageway at said first end of said tubular body.
  • Said at least one inlet port is capable of receiving molten metal from a tundish and conducting the same into said passageway.
  • the molten metal is conducted from said inlet port through said passageway to a plurality of outlet ports, opening into said passageway in a region adj acent to said second end of said tubular body.
  • Said plurality of outlet ports is capable of conducting molten steel, delivered from said passageway, through the outlet ports to the outside of said tubular body and into a mould of the continuous casting machine.
  • the nozzle In its use position in the continuous casting machine, the nozzle is arranged generally vertically, with the central longitudinal axis of the passageway extending vertically and with the first end of the tubular body positioned upside and the second end of the tubular body positioned downside.
  • molten metal can be conducted through the nozzle from said inlet port into the passageway, through said passageway, and through the outlet ports into the mould by force of gravity.
  • a submerged entry nozzle of this type is disclosed, for example, in EP 1 671 721 B l .
  • EP 2 769 786 B l discloses a submerged entry nozzle, comprising outlet ports having a geometry to provide the metal melt, flowing out of the outlet ports, with a certain twist.
  • a nozzle providing the outflowing metal melt with a certain twist, allows to reduce or to even eliminate the need for an electromagnetic stirrer.
  • the inventors of the present invention found out that the stirring of the metal melt, flowing out of the nozzle, and hence the homogeneity of the melt and its solidification, can be improved when the swirling motion is increased, i.e. when the metal swirls with a higher velocity.
  • a submerged entry nozzle through which molten steel can be poured from a tundish into a mould, said nozzle comprising: a substantially tubular body, extending from a first end to a second end of said tubular body;
  • At least one inlet port opening into said passageway at said first end;
  • each of said outlet ports is slit-shaped and extending helically around said longitudinal axis;
  • passageway terminates in the axial direction of said longitudinal axis towards said second end with a distance to said second end in said region adjacent to said second end at a bottom, wherein said bottom comprises a protrusion, protruding into said passageway.
  • the submerged entry nozzle of the present invention comprises outlet ports being slit-shaped and extending helically around said central longitudinal axis. By means of such outlet ports, a swirling motion is induced to the molten metal, issuing from the nozzle, i. e. flowing out of the outlet ports of the nozzle.
  • the passageway of the nozzle terminates - in the axial direction of its longitudinal axis towards said second end - with a distance to said second end in said region adjacent to said second end at a bottom, wherein said bottom comprises a protrusion, protruding into the passageway.
  • said protrusion may comprise a surface area, facing towards said outlet ports.
  • the velocity of the stream of molten metal towards said outlet ports is increased when the molten metal flows over such surface area.
  • the inventors found out that with an increased velocity of the molten metal, flowing in the passageway towards the outlet ports, the velocity of the stream of molten metal, flowing through the outlet ports and finally flowing out of the outlet ports into the mould of the continuous casting machine, may be increased. Accordingly, with such a protrusion, the velocity of the molten metal, issued from the nozzle and, hence, the velocity of the swirling motion, induced to the molten metal, can be increased.
  • said protrusion at the bottom of the passageway may have any shape of a protrusion, for example the shape of a pyramid, a cone or a truncated cone.
  • the protrusion is dome-shaped. According to the invention, it was found out that with such a dome-shaped protrusion, the stream of molten metal can be divided and directed towards the outlet ports with an increased velocity and at the same time without the appearance of any turbulences in the stream of molten metal.
  • the protrusion preferably tapers in a direction from the second end towards first end of the tubular body, i.e. in a direction from the bottom of the passageway into the passageway.
  • the protrusion comprises at least one groove in the surface area thereof, particularly preferred in the surface area thereof facing towards the outlet ports.
  • the protrusion comprises at least one groove in the surface area thereof extending helically around the longitudinal axis.
  • the protrusion comprises at least two grooves in the surface area thereof extending helically around the longitudinal axis, particularly preferred two to five and even more preferred three to five grooves in the surface area thereof extending helically around the longitudinal axis.
  • the helically extending grooves have the same direction of rotation as the outlet ports. The inventors found out that which such helically grooves in the surface area of the protrusion, the stream of molten metal can be directed towards the outlet ports in such that the velocity of the molten metal leaving the outlet ports can be increased.
  • said grooves may have any shape.
  • the grooves have a semicircular cross-section or a cross- section in the form of a circular segment.
  • the protrusion may seal the passageway in a direction along the central longitudinal axis of the passageway towards the said second end of the tubular body.
  • the protrusion obstructs the passageway totally or partly towards the second end of the tubular body.
  • the passageway may totally be sealed by the protrusion.
  • the base of the protrusion obstructs at least 80 % of the cross-sectional area of the passageway.
  • the protrusion tapers in a direction from said second end towards said first end and terminates in a peak (i.e. a top) laying on said longitudinal axis of the passageway.
  • the protrusion tapers from its base towards a peak, wherein said peak of the protrusion is laying on said longitudinal axis of the passageway.
  • the flow of molten metal can be divided symmetrically by the protrusion, i. e. in several identical streams with the same flow pattern.
  • the protrusion is disposed symmetrically about the longitudinal axis of the passageway.
  • the protrusion is rotationally symmetrical to the
  • the angle between said surface area of the protrusion, facing towards the outlet ports, and said longitudinal axis has an influence on the velocity of the stream of molten metal conducted towards the outlet ports. Insofar, if this angle is too small, the molten metal is not conducted towards the outlet ports. On the other hand, if this angle is too high, the velocity of the stream of molten metal, flowing through the passageway, can be decreased.
  • the angle between said surface areas of the protrusion, facing towards the outlet ports, and said longitudinal axis of the passageway is between 20 and 60 degrees, more preferably between 30 and 50 degrees and most preferably between 30 and 45 degrees. This embodiment not necessarily requires that the angle between all surface areas of the protrusion and the longitudinal axis of the passageway is within this range but at least preferable the angle between the surface area of the protrusion, facing towards the outlet ports, and said
  • the protrusion may comprise surface areas, not facing towards the outlet ports, and wherein the angle between such surface areas and the longitudinal axis is not in the above range.
  • the angle between the surface areas of the protrusion in region of the peak (i.e. in the top region) of the protrusion and the longitudinal axis not necessarily have to include an angle in the above range.
  • only the angle between the surface area of the protrusion at the edge of the protrusion, i.e. the side walls of the protrusion, and the longitudinal axis might be in the above-identified range.
  • At least 70 %, and even more preferably 90% of the surface area of the protrusion, in relation to the entire surface area of the protrusion, is a surface area, the angle between such surface area and the central longitudinal axis of the passageway is in the above range.
  • each of said outlet ports opens into said passageway through an orifice with each of said orifices running along said longitudinal axis for a first distance, and wherein said protrusion runs along said central
  • the orifices of the outlet ports and the protrusion run side by side (in relation to the central longitudinal axis) to each other over a length of at least 50 %, more preferably at least 70 % and even more preferably 100 % of the length of the orifices.
  • Said longitudinal axis of the passageway is the central longitudinal axis thereof.
  • the passageway has a circular cross-section and even more preferable has the shape of a cylinder, i.e. a cylinder with a circular cross section orthogonal (i.e. rectangular) to the longitudinal axis of the passageway.
  • the tubular body is preferably made of a refractory material, preferably of a ceramic refractory material or a carbon-bonded refractory material.
  • the refractory material of the tubular body can be any known refractory material used for submerged entry nozzles, especially any such ceramic refractory material or carbon-bonded refractory material.
  • such material can be at least one of the following materials: carbon-bonded magnesia, carbon-bonded alumina, carbon-bonded spinel (i.e. magnesia- alumina-spinel) or carbon-bonded zirconia.
  • the at least one inlet port opening into the passageway at the first end of the tubular body, preferably lays in the longitudinal axis of the passageway.
  • the outer contour of the tubular body has the shape of a cylinder at least in the region of the outlet ports.
  • the inventors found out that with such cylindrical shape of the tubular body in the region of the outlet ports, the swirling motion of the molten, issued to the mould, can be further increased.
  • said part of the tubular body, having the outer contour of a cylinder has an axis, being coaxial with said longitudinal axis of the passageway.
  • the outer contour of the tubular body is rotationally symmetrical in view of said central longitudinal axis of said part of the tubular body, having the outer contour of a cylinder.
  • the outlet ports allow discharging molten metal out of the tubular body radially to said central longitudinal axis and at the same time axially to said central longitudinal axis of the passageway in a direction towards said second end.
  • said outlet ports of the nozzle are arranged such that they allow discharging of molten metal out of the tubular body into the mould not only in a radial direction (in view of the longitudinal axis), but as well in a direction which runs parallel to the direction of the longitudinal axis.
  • the outlet ports extend through the lateral wall of the tubular body and the end wall of the tubular body, delimiting the tubular body at said second end, at the same time. Accordingly, the orifices of each outlet port, opening to the outside of the tubular body, not only lay at the lateral wall of the tubular body but also extend into the end wall of the tubular body, delimiting the tubular body at its second end.
  • the outlet ports may have the shape as disclosed in figures 1 -6 of EP 2 769 786 B l .
  • the end wall of the tubular body delimiting the tubular body at the second end thereof, may be even (i.e. flat), dome-like (i.e. convex when seen from the outside of the tubular body) or concave when seen from the outside of the tubular body.
  • the inventors further found out that the velocity of the stream of molten metal, issued from the outlet ports to the mould, can be further increased when the outlet ports taper in a direction from the passageway towards the outside of the tubular body, i.e. in a direction from the orifice of the respective outlet port, opening into the passageway, towards the orifice of the respective outlet port, opening to the outside of the tubular body.
  • the outlet ports in such case act like a jet that increases the velocity of a fluid.
  • it is provided a cross sectional area of said outlet ports, reducing in the direction from said passageway to the outside of the tubular body.
  • the cross-sectional area of each outlet port tapers in the direction from the passageway towards the outside of the tubular body.
  • the outlet ports are disposed symmetrically about the longitudinal axis of the passageway. Especially, it is preferred that the outlet ports are disposed evenly (uniformly) about the longitudinal axis, i.e. spaced at equal distance from one another about the longitudinal axis. In such case, a very symmetrical and homogenous swirling motion can be induced to the molten metal.
  • outlet ports should be provided to induce a swirling motion to the molten metal issued from the nozzle.
  • at least three, especially three to five outlet ports are provided.
  • four outlet ports are provided which preferably are disposed symmetrically about the central longitudinal axis of the passageway.
  • the outlet ports are slit-shaped, i.e. having a larger expansion in a first direction than in a second direction, running orthogonal (i.e. rectangular) to said first direction.
  • the outlet ports Preferably, have a rectangular cross-section.
  • the orifice of each of said outlet ports has a length (i.e. the larger expansion of the slit) to width (i.e. the smaller expansion of the slit) ratio in the range from 2 : 1 to 8 : 1 , and even more preferably in the range from 3 : 1 to 7 : 1 .
  • the outlet ports are extending helically around said longitudinal axis, i.e.
  • each of the outlet ports extends spiral-shaped about said longitudinal axis of the passageway.
  • the gradient angle of the outlet ports i.e. the angle of the outlet ports in relation to a plane, extending orthogonally (i.e. rectangular) to the longitudinal axis of the passageway, should be within a certain range to induce a swirling motion to the molten metal. If the gradient angle of the outlet ports is too small, the velocity of the molten metal can be decelerated too much. On the other hand, if the gradient angle of the outlet ports is too high, the velocity of the molten metal is high but the swirling motion, induced to the molten metal, may be too small. Accordingly, the gradient angle of the outlet ports preferably is in the range from 20 to 80 degrees, more preferably in the range from 30 to 70 degrees and particularly preferred in the range from 30 to 60 degrees.
  • Fig. 1 is a perspective view of a submerged entry nozzle in
  • FIG. 2 is a perspective view of the nozzle according to Fig. 1 in the region adjacent to the second end thereof;
  • Fig. 3 is a perspective view of the nozzle according to Fig. 1 , wherein the inner contour of the nozzle in said region is illustrated by dashed lines;
  • Fig. 4 is a perspective cutaway view of the nozzle according to Fig. 1 in the region adjacent to the second end thereof;
  • Fig. 5 is another perspective cutaway view of the nozzle according to Fig. 1 in the region adjacent to the second end thereof;
  • Fig. 6 is a cross-sectional view of the nozzle according to Fig. 1 , taken along the longitudinal axis thereof;
  • Fig. 7 is a cross-sectional view of the nozzle according to Fig. 1 , taken along the longitudinal axis thereof, in the region adjacent to the second end thereof;
  • Fig. 8 is a cross-sectional view of the nozzle according to Fig. 1 , taken along the longitudinal axis thereof, in the region adjacent to the second end thereof, wherein the inner contour of the nozzle in said region is illustrated by dashed lines.
  • the nozzle 1 according to the illustrated embodiment comprises a substantially tubular body 2, extending from a first end 3 towards a second end 4 thereof.
  • the nozzle 1 is illustrated in its use position, i. e. with the first end 3 of the tubular body 2 positioned upside and the second end 4 of the tubular body 2 positioned downside.
  • the tubular body 2 is made of a carbon bonded refractory material.
  • the submerged entry nozzle 1 further comprises a passageway 5 , extending through said tubular body 2, along a longitudinal axis A from said first end 3 towards said second end 4.
  • Said passageway 5 has the shape of a cylinder, i. e. a cylinder with a circular cross section orthogonal to the longitudinal axis A, wherein said passageway 5 is rotationally symmetrical about said longitudinal axis A. In the use position of the nozzle 1 according to the Figures, said longitudinal axis A is extending vertically.
  • one inlet port 6 opens into said passageway 5.
  • Each of said outlet ports 8 is slit shaped and extends helically around said longitudinal axis A.
  • said passageway 5 terminates with a distance to said second end 4 at a bottom 9.
  • Said bottom 9 comprises a protrusion 10, protruding into said passageway 5.
  • Said protrusion 5 is dome-shaped and, accordingly, tapers in a direction from said second end 4 towards said first end 3 and terminates in a peak 1 1 , laying on said longitudinal axis A.
  • Said protrusion 10 is disposed rotationally symmetrical about said longitudinal axis A.
  • the side walls 12 of the protrusion 10 provide a surface area of the protrusion 10, facing towards said outlet ports 8, whereas the top region of the protrusion 10, adjacent to the peak 1 1 , is facing upwards towards said inlet port 6 and provides a surface area 13 of the protrusion 10 which is not facing towards the outlet ports 8.
  • the angle a between said surface area 12 and said longitudinal axis A is between about 30 and 45 ° .
  • the four outlet ports 8 are disposed symmetrically about said
  • the four outlet ports 8 are spaced at equal distance from one another about said longitudinal axis A.
  • the four outlet ports 8 extend through the lateral wall 14 of said tubular body 2 and the end wall 15 of said tubular body 2, delimiting the tubular body 2 at its second end 4.
  • the gradient angle of each of said outlet ports 8 is about 45°.
  • the tubular body 2 has a cylindrical outer contour with said outer contour being rotationally symmetrical about said longitudinal axis A.
  • the tubular body 2 features such cylindrical contour in a region 16, starting at said second end 4 and terminating at a distance of about 70 % of the length of said tubular body 2 towards said first end 3.
  • the outer contour of the tubular body 2 continues in a coned portion 17, tapering slightly outwardly.
  • the outer contour of the tubular body 2 further continues in a portion 18 with a cylindrical outer contour, forming a region adjacent to said first end 3.
  • the entire outer contour of the tubular body 2 is rotationally
  • each of said outlet ports 8 tapers in a direction from said passageway 5 towards the outside of the tubular body 2.
  • Each of said outlet ports 8 opens into said passageway 5 through an orifice 19, with each of said orifices 19 running along said longitudinal axis A for a first distance 20, and wherein said protrusion 10 runs along said longitudinal axis A for a second distance 21 , and wherein said second distance 21 overlaps with said first distance 20 for about 80 % of the length of said first distance 20.
  • the submerged entry nozzle 1 When using the submerged entry nozzle 1 , the submerged entry nozzle 1 is arranged such at a tundish of a continuous casting machine that the outlet of the tundish opens into the inlet port 6 of the nozzle 1 .
  • the region 7 of the tubular body 2 of the nozzle 1 is arranged in a mould.
  • molten metal can be poured from the tundish through the inlet port 6 into said passageway 5 , through said passageway 5 to the protrusion 10, is divided by the protrusion 10 and directed towards the orifices 19 of the outlet ports 8, and finally conducted through the outlet ports 8 to the outside of the tubular body 2 and into the mould.
  • the velocity of the stream of molten metal is increased when it flows over the surface area 12, facing towards the outlet ports 8 or the orifices 19 thereof, respectively.
  • the velocity of the stream of molten metal, running through the outlet ports 8, is further increased due to the cross-sectional area of the outlet ports 8 , tapering from said passageway 5 towards the outside of the tubular body 2.
  • the stream of molten metal, charged through the outlet ports 8 into the mould, has a high velocity, and thus a high swirling motion is induced to the molten metal, issuing from the nozzle 1 .

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

Abstract

La présente invention concerne une buse d'entrée immergée, en particulier une buse d'entrée immergée par l'intermédiaire de laquelle de l'acier fondu peut être versé à partir d'un panier de coulée dans un moule.
PCT/EP2018/075048 2017-11-22 2018-09-17 Buse d'entrée immergée WO2019101389A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17203004.1A EP3488949A1 (fr) 2017-11-22 2017-11-22 Buse d'entrée submergée
EP17203004.1 2017-11-22

Publications (1)

Publication Number Publication Date
WO2019101389A1 true WO2019101389A1 (fr) 2019-05-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/075048 WO2019101389A1 (fr) 2017-11-22 2018-09-17 Buse d'entrée immergée

Country Status (2)

Country Link
EP (1) EP3488949A1 (fr)
WO (1) WO2019101389A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024022873A1 (fr) 2022-07-28 2024-02-01 Tata Steel Ijmuiden B.V. Buse d'entrée immergée
EP4098367A4 (fr) * 2020-01-22 2024-04-24 Minxing Ke Dispositif de commande de forme dans lequel est évacué un liquide

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3900855A1 (fr) 2020-04-21 2021-10-27 Refractory Intellectual Property GmbH & Co. KG Insert rotatif et buse submergée
CN113846202B (zh) * 2021-10-26 2022-07-19 西安建筑科技大学 一种气基竖炉还原气喷嘴及气基竖炉

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5227078A (en) * 1992-05-20 1993-07-13 Reynolds Metals Company Flow-vectored downspout assembly and method for using same
CN2770832Y (zh) * 2004-12-24 2006-04-12 中钢集团洛阳耐火材料研究院 薄板坯连铸用浸入式水口
JP2008000810A (ja) * 2006-06-26 2008-01-10 Kobe Steel Ltd 堰型湯溜り付浸漬ノズルを用いた高炭素鋼の連続鋳造方法
EP1671721B1 (fr) 2003-08-22 2009-07-15 Krosakiharima Corporation Buse d'immersion pour coulee continue d'acier et procede de coulee continue d'acier utilisant la buse
EP2769786B1 (fr) 2013-02-25 2017-04-19 Refractory Intellectual Property GmbH & Co. KG Buse d'entrée submergée

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5227078A (en) * 1992-05-20 1993-07-13 Reynolds Metals Company Flow-vectored downspout assembly and method for using same
EP1671721B1 (fr) 2003-08-22 2009-07-15 Krosakiharima Corporation Buse d'immersion pour coulee continue d'acier et procede de coulee continue d'acier utilisant la buse
CN2770832Y (zh) * 2004-12-24 2006-04-12 中钢集团洛阳耐火材料研究院 薄板坯连铸用浸入式水口
JP2008000810A (ja) * 2006-06-26 2008-01-10 Kobe Steel Ltd 堰型湯溜り付浸漬ノズルを用いた高炭素鋼の連続鋳造方法
EP2769786B1 (fr) 2013-02-25 2017-04-19 Refractory Intellectual Property GmbH & Co. KG Buse d'entrée submergée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4098367A4 (fr) * 2020-01-22 2024-04-24 Minxing Ke Dispositif de commande de forme dans lequel est évacué un liquide
WO2024022873A1 (fr) 2022-07-28 2024-02-01 Tata Steel Ijmuiden B.V. Buse d'entrée immergée

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