US20220161320A1 - Device for Preventing Ingress of Floating Matter on Free Surfaces of Ladle and Tundish During Continuous Casting Process - Google Patents

Device for Preventing Ingress of Floating Matter on Free Surfaces of Ladle and Tundish During Continuous Casting Process Download PDF

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Publication number
US20220161320A1
US20220161320A1 US17/434,851 US202017434851A US2022161320A1 US 20220161320 A1 US20220161320 A1 US 20220161320A1 US 202017434851 A US202017434851 A US 202017434851A US 2022161320 A1 US2022161320 A1 US 2022161320A1
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United States
Prior art keywords
plate
discharge port
ladle
tundish
radius
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Abandoned
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US17/434,851
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English (en)
Inventor
Il Seouk Park
Jong Hyeon Son
Jong Hui LEE
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Industry Academic Cooperation Foundation of KNU
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Industry Academic Cooperation Foundation of KNU
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Assigned to KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION reassignment KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEE, JONG HUI, PARK, IL SEOUK, SON, JONG HYEON
Publication of US20220161320A1 publication Critical patent/US20220161320A1/en
Abandoned legal-status Critical Current

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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
    • B22D11/103—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

Definitions

  • the following description relates to a device for preventing ingress of floating matters on free surfaces of a ladle and a tundish during a continuous casting process.
  • Dimples are often found on a free surface when liquid in a container is drained or suctioned through a narrow port.
  • a swirling flow is caused by the Coriolis effect or external disturbance in the container, the dimple develops rapidly in a vertical direction, and reaches a discharge port or pump inlet.
  • Such dimple penetration is called an air-core phenomenon.
  • the air-core phenomenon during a liquid draining process results in serious problems for many industrial devices.
  • the air-core phenomenon generated by a swirling flow in a liquid propellant tank causes fluctuations in a fuel supply rate. Since an effective drainage area occupied by a fluid in a liquid phase is narrowed due to an air core, the fuel supply rate may be significantly reduced by the air-core phenomenon.
  • an air core may be created by a swirling flow initiated by the operation of a pump. Air entrained in the pump may cause cavitation on pump blades, a reduction in pump efficiency, vibration, and noise.
  • a slag floating on a molten metal may be entrained as a slab due to the air-core phenomenon, which results in significant quality defects in steel products. Therefore, many studies have been made to prevent such an air-core phenomenon.
  • Korean Patent Application Publication No. 10-2011-0028023 discloses a device for preventing a vortex of a molten steel in a tundish.
  • An aspect provides a device for preventing ingress of floating matters on free surfaces of a ladle and a tundish during a continuous casting process.
  • a device for preventing ingress of floating matters on free surfaces of a ladle and a tundish the ladle and the tundish each having a discharge port, during a continuous casting process the device configured for installation at the discharge ports of the ladle and the tundish, and including a disc-shaped plate, and a support part installed at the plate and configured to support the plate on a surface around each of the discharge ports of the ladle and the tundish.
  • Each of a ratio of a width of the plate to a radius of the discharge port of the ladle and a ratio of the width of the plate to a radius of the discharge port of the tundish may have a value equal to or greater than 1.
  • Each of the ratio of the width of the plate to the radius of the discharge port of the ladle and the ratio of the width of the plate to the radius of the discharge port of the tundish may have a value equal to or greater than 2.
  • Each of the ratio of the width of the plate to the radius of the discharge port of the ladle and the ratio of the width of the plate to the radius of the discharge port of the tundish may have a value less than or equal to 8.
  • Each of the ratio of the width of the plate to the radius of the discharge port of the ladle and the ratio of the width of the plate to the radius of the discharge port of the tundish may have a value less than or equal to 4.
  • a ratio of a distance between surfaces around the plate and the discharge port to the radius of the discharge port of the ladle or a ratio of the distance between the surfaces around the plate and the discharge port to the radius of the discharge port of the tundish may have a value equal to or greater than 2.
  • the ratio of the distance between the surfaces around the plate and the discharge port to the radius of the discharge port of the ladle or the ratio of the distance between the surfaces around the plate and the discharge port to the radius of the discharge port of the tundish may have a value less than or equal to 4.
  • the support part may include a plurality of protruding elements protruding from the plate.
  • the plurality of protruding elements may be arranged to be spaced apart from each other in a circumferential direction with respect to a central portion of the plate.
  • the device according to an aspect may prevent ingress of float matter on free surfaces of a ladle and a tundish during a continuous casting process.
  • FIG. 1 is a diagram illustrating a continuous casting process system including a device for preventing ingress of floating matters according to an example embodiment.
  • FIG. 2 is a perspective diagram illustrating a device for preventing ingress of floating matters according to an example embodiment.
  • FIG. 3 is a conceptual diagram illustrating a state in which a device for preventing ingress of floating matters according to an example embodiment is installed.
  • FIG. 4 is a diagram illustrating experimental equipment used to prove a technical effect of a device for preventing ingress of floating matters according to an example embodiment.
  • FIG. 5 is a graph illustrating a comparison of draining times and water heights according to changes in a height of a device for preventing ingress of floating matters from a bottom surface of a tank, derived using the experimental equipment of FIG. 4 .
  • FIG. 6 is a graph illustrating a comparison of draining times and water heights according to changes in a width of a device for preventing ingress of floating matters from a bottom surface of a tank, derived using the experimental equipment of FIG. 4 .
  • FIGS. 7A to 7C are graphs illustrating elapsed times of a water-air interface during drainage derived using the experimental equipment of FIG. 4 , wherein FIG. 7A is a graph when there is no device for preventing ingress of floating matters, FIG. 7B is a graph when there is a device for preventing ingress of floating matters, the device having a width of 15 mm and a height of 10 mm, and FIG. 7C is a graph when there is a device for preventing ingress of floating matters, the device having a width of 30 mm and a height of 20 mm.
  • first, second, A, B, (a), (b), and the like may be used herein to describe components of the example embodiments. These terms are only used to distinguish one component from another component, and essential, order, or sequence of corresponding components are not limited by these terms. It will be understood that when one component is referred to as being “connected to”, “coupled to”, or “linked to” another component, one component may be “connected to”, “coupled to”, or “linked to” another component via a further component although one component may be directly connected to or directly linked to another component.
  • a component included in any one example embodiment and another component including a function in common with that of the component will be described using the same designation in other example embodiments. Unless otherwise indicated, a description of one example embodiment may be applied to other example embodiments, and a detailed description will be omitted in an overlapping range.
  • FIG. 1 is a diagram illustrating a continuous casting process system including a device for preventing ingress of floating matters according to an example embodiment.
  • a continuous casting process system 10 may include a ladle 110 , a tundish 120 , a casting mold 130 , and a device 140 that suppresses a swirling flow generated in the ladle 110 and the tundish 120 to prevent ingress (or entrainment) of floating matters on a free surface of the ladle 110 and a free surface of the tundish 120 into the casting mold 130 .
  • a first shroud 114 may be installed between the ladle 110 and the tundish 120
  • a second shroud 124 may be installed between the tundish 120 and the casting mold 130 .
  • a first valve 116 that opens and closes a flow of a fluid on a flow path from the ladle 110 to the tundish 120 may be installed on the first shroud 114 .
  • a second valve 126 that opens and closes a flow of a fluid on a flow path from the tundish 120 to the casting mold 130 may be installed on the second shroud 124 .
  • Devices for preventing ingress of floating matters 140 may be installed on a bottom surface of the ladle 110 and a bottom surface of the tundish 120 so as to be respectively adjacent to a discharge port 112 of the ladle 110 and a discharge port 122 of the tundish 120 .
  • Taylor vortex plays an important role in concentrating an axial momentum initiated by draining a fluid to a central portion of each of the ladle 110 and the tundish 120 , and the strong axial momentum of the ladle 110 and the tundish 120 helps the growth of the Taylor vortex.
  • the devices for preventing ingress of floating matters 140 that are respectively positioned adjacent (or directly) to the discharge ports 112 and 122 help to effectively block an interaction between the Taylor vortex and the axial momentum.
  • FIG. 2 is a perspective diagram illustrating a device for preventing ingress of floating matters according to an example embodiment
  • FIG. 3 is a conceptual diagram illustrating a state in which the device for preventing ingress of floating matters according to an example embodiment is installed.
  • the device for preventing ingress of floating matters 140 may include a plate 142 and a support part 144 .
  • the plate 142 may have a shape suitable for effectively retarding the generation of an air core.
  • the plate 142 may have a disk shape such as a circle, an ellipse or several polygons.
  • the support part 144 is configured to support the plate 142 on a bottom surface 51 of the ladle 110 , in particular, the surface 51 around the discharge port 112 of the ladle 110 .
  • the support part 144 is configured to support the plate 142 on a bottom surface of a tundish, in particular, a surface around a discharge port of the tundish.
  • the support part 144 may include a plurality of protruding elements 1441 .
  • the plurality of protruding elements 1441 may protrude from a lower surface of the plate 142 .
  • the plurality of protruding elements 1441 may have a cylindrical shape.
  • the plurality of protruding elements 1441 may be arranged to be spaced apart from each other in a circumferential direction with respect to a central portion of the plate 142 .
  • the plurality of protruding elements 1441 may be arranged in a matrix form on the lower surface of the plate 142 .
  • a descending pattern of a fluid may depend on a width 2 R of the plate 142 .
  • the descending pattern of the fluid may depend on a ratio of the width 2 R of the plate 142 to a width 2 r of the discharge port 112 .
  • the descending pattern of the fluid may not depend on a distance h between the plate 142 and the surface S 1 .
  • a height of the plate 142 from the surface S 1 may not affect the descending pattern of the fluid.
  • FIG. 4 is a diagram illustrating experimental equipment used to prove a technical effect of a device for preventing ingress of floating matters according to an example embodiment.
  • FIG. 4 the experimental equipment used for a liquid drainage experiment is illustrated in order to prove the technical effect of the device for preventing ingress of floating matters according to an example embodiment.
  • Air and water in a set ratio were contained inside a tank T.
  • a discharge port was formed at the bottom of the tank T.
  • a width of the discharge port was set to 10 mm, that is, a radius of the discharge port was set to 5 mm.
  • a width of the tank T was set to 90 mm
  • a height of the water contained in the tank T was set to 250 mm from the bottom
  • a height of an air layer was set to 100 mm from a free surface of the water.
  • the free surface was implemented by removing an upper cover of the tank T.
  • a motor M was connected to a shaft S connected to the tank T with a belt B, and the motor M was driven to rotate the tank T.
  • a CCD camera C acquired an image of the water contained in the tank T at a rate of 20 frames per second. A level of a liquid over time was measured by a computer P based on the image received from the CCD camera C.
  • the device for preventing ingress of floating matters was placed adjacent to the discharge port of the tank as a prototype.
  • FIG. 5 is a graph illustrating a comparison of draining times and water heights according to changes in a height of a device for preventing ingress of floating matters from a bottom surface of a tank, derived using the experimental equipment of FIG. 4 .
  • a graph illustrates a comparison according to the presence or absence of the device for preventing ingress of floating matters and a comparison according to a height of the device for preventing ingress of floating matters having a consistent width.
  • Rot means the rotation of a tank
  • SUPp means the device for preventing ingress of floating matters. Therefore, “No Rot” means that there is no rotation of the tank, and “No Supp” means that there is no device for preventing ingress of floating matters.
  • the time required for the water from the tank to be completely drained was about 21 seconds.
  • FIG. 6 is a graph illustrating a comparison of draining times and water heights according to changes in a width of a device for preventing ingress of floating matters from a bottom surface of a tank, derived using the experimental equipment of FIG. 4 .
  • a graph illustrates a comparison according to the width of the device for preventing ingress of floating matters spaced apart from the bottom surface of the tank at a consistent height.
  • width means a maximum length in a horizontal direction of the device for preventing ingress of floating matters. Therefore, when the device for preventing ingress of floating matters has a circular disk shape, “width” may also be interpreted as “diameter”.
  • the device has a width of 5 mm, that is, the width of the device for preventing ingress of floating matters is relatively small compared to a radius of 5 mm of a discharge port, a water level descended at a significantly rapid rate for first about 4 seconds.
  • the width of the device for preventing ingress of floating matters increased relative to the radius of the discharge port of the tank, a sudden change in the water level during the initial drainage disappeared, and an initial descent rate of the water level significantly decreased.
  • FIGS. 7A to 7C are graphs illustrating elapsed times of a water-air interface during drainage derived using the experimental equipment of FIG. 4 , wherein FIG. 7A is a graph when there is no device for preventing ingress of floating matters, FIG. 7B is a graph when there is a device for preventing ingress of floating matters, the device having a width of 15 mm and a height of 10 mm, and FIG. 7C is a graph when there is a device for preventing ingress of floating matters, the device having a width of 30 mm and a height of 20 mm.
  • FIGS. 7A to 7C in the case of FIG. 7A , it was confirmed that a dimple generated by the rotation of a tank was rapidly suctioned into a discharge port at about 3 seconds. During draining time, an air core remained. An air phase partially occupies a cross section of the discharge port, and thus a drain flow rate of water started to decrease after the generation of the air core.
  • the width of the device for preventing ingress of floating matters is in an appropriate range, it is possible to effectively retard the generation of the air core, and it can be confirmed that it is advantageous in terms of the draining rate and complete draining time of a fluid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US17/434,851 2019-03-04 2020-03-02 Device for Preventing Ingress of Floating Matter on Free Surfaces of Ladle and Tundish During Continuous Casting Process Abandoned US20220161320A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020190024783A KR102184274B1 (ko) 2019-03-04 2019-03-04 연속 주조 공정 중 래들 및 턴디쉬의 자유 표면의 부유물 혼입 방지 장치
KR10-2019-0024783 2019-03-04
PCT/KR2020/002941 WO2020180063A1 (ko) 2019-03-04 2020-03-02 연속 주조 공정 중 래들 및 턴디쉬의 자유 표면의 부유물 혼입 방지 장치

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US (1) US20220161320A1 (ko)
KR (1) KR102184274B1 (ko)
CN (1) CN114096361A (ko)
WO (1) WO2020180063A1 (ko)

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KR102595686B1 (ko) 2023-06-22 2023-10-27 김기훈 턴디쉬 커버 지금 제거장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5375816A (en) * 1993-11-16 1994-12-27 Wci Steel Corporation Slag detecting device and method
US5382003A (en) * 1992-12-08 1995-01-17 Sankaranarayanan; Ramani Flow control device for the suppression of vortices
JP2000301297A (ja) * 1999-04-20 2000-10-31 Akechi Ceramics Co Ltd タンディッシュ

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917501Y2 (ja) * 1980-04-23 1984-05-22 日本鋼管株式会社 金属用容器出湯孔のスラグ巻込み防止装置
JPS632539A (ja) * 1986-06-23 1988-01-07 Nippon Kokan Kk <Nkk> 溶湯流出口を備えた溶湯容器
JPH07124719A (ja) * 1993-11-08 1995-05-16 Nippon Steel Corp 表層均質鋳片鋳造用の浸漬ノズル
KR100286660B1 (ko) * 1996-12-23 2001-05-02 이구택 래들 또는 턴디쉬내의 와류발생 억제장치
KR200267443Y1 (ko) * 1997-12-16 2002-06-26 이구택 제강공정에서의용강중슬래그혼입저감구조
DE19959540A1 (de) * 1999-12-09 2001-06-13 Sms Demag Ag Verfahren und Vorrichtung zum Einleiten einer Schmelze aus einem Verteiler über ein Tauchrohr in eine Stranggießkokille
KR101277171B1 (ko) * 2008-04-02 2013-06-19 주식회사 포스코 연속주조용 쉬라우드 노즐
KR101104232B1 (ko) 2009-09-11 2012-01-10 학교법인 동의학원 턴디쉬 내 용강의 와류 억제장치
WO2011055484A1 (ja) * 2009-11-06 2011-05-12 住友金属工業株式会社 溶融金属の連続鋳造方法
KR101175444B1 (ko) * 2010-04-29 2012-08-20 현대제철 주식회사 래들의 바닥 구조체
CN101844223B (zh) * 2010-06-22 2011-10-12 重庆大学 防止连铸中间包产生旋流的旋流抑制器
CN102398004A (zh) * 2011-11-29 2012-04-04 中冶南方工程技术有限公司 防止旋涡产生的滑动水口装置
CN102554207A (zh) * 2012-01-17 2012-07-11 中冶南方工程技术有限公司 一种防止旋涡产生的滑动水口装置
JP6520592B2 (ja) * 2015-09-11 2019-05-29 日本製鉄株式会社 金属の連続鋳造装置、及び、金属の連続鋳造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382003A (en) * 1992-12-08 1995-01-17 Sankaranarayanan; Ramani Flow control device for the suppression of vortices
US5375816A (en) * 1993-11-16 1994-12-27 Wci Steel Corporation Slag detecting device and method
JP2000301297A (ja) * 1999-04-20 2000-10-31 Akechi Ceramics Co Ltd タンディッシュ

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WO2020180063A1 (ko) 2020-09-10
KR102184274B1 (ko) 2020-11-30
CN114096361A (zh) 2022-02-25
KR20200106353A (ko) 2020-09-14

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