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EP3941654B1 - Refroidissement d'un produit laminé plan sans arrêt retardé de la coulée - Google Patents

Refroidissement d'un produit laminé plan sans arrêt retardé de la coulée Download PDF

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Publication number
EP3941654B1
EP3941654B1 EP20711872.0A EP20711872A EP3941654B1 EP 3941654 B1 EP3941654 B1 EP 3941654B1 EP 20711872 A EP20711872 A EP 20711872A EP 3941654 B1 EP3941654 B1 EP 3941654B1
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EP
European Patent Office
Prior art keywords
outlet
outlet tube
cooling
tubes
section
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.)
Active
Application number
EP20711872.0A
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German (de)
English (en)
Other versions
EP3941654A1 (fr
EP3941654C0 (fr
Inventor
Klaus Weinzierl
Erich Opitz
Lukas PICHLER
Florian POESCHL
Alois Seilinger
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.)
Primetals Technologies Austria GmbH
Original Assignee
Primetals Technologies Austria GmbH
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
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Publication of EP3941654A1 publication Critical patent/EP3941654A1/fr
Application granted granted Critical
Publication of EP3941654B1 publication Critical patent/EP3941654B1/fr
Publication of EP3941654C0 publication Critical patent/EP3941654C0/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work

Definitions

  • a metallic flat rolled stock is cooled after rolling.
  • the flat rolled stock can consist of steel or aluminum, for example. It can be a strip or a heavy plate, as required.
  • Exact temperature control in the cooling section is usual in order to set the desired material properties and keep them constant with less dispersion.
  • several cooling beams are installed along the cooling section for this purpose, by means of which a liquid coolant, usually water, is applied to the flat rolled stock at least from above, often from above and below, to cool the hot rolled stock.
  • the chilled beams of the DE 199 34 557 A1 occurs, as in the EN 10 2010 049 020 1 is correctly designed, when the coolant supply is switched off, the cooling beam is sucked dry via the outlet tubes according to the principle of a suction lifter. During this period, the coolant escapes from the outlet tubes in an uncontrolled manner and thus leads to uncontrolled cooling of the flat rolled stock and the associated adverse effects.
  • outlet tubes are straight tubes that extend into the cooling beam from below and reach a significant height so that they end in the upper area of the cooling beam.
  • this solution also results in a significant amount of coolant running after the cooling beam is switched off. This solution only leads to good results with intensive cooling that involves working with high pressures.
  • the object of the present invention is to create possibilities by means of which the run-on of coolant can be limited to an unavoidable minimum using simple measures.
  • the vertical length of the initial sections should be kept small and, on the other hand, a maintenance-friendly solution should be created that works without problems in continuous operation.
  • a device of the type mentioned at the outset is designed in that the outlet tubes - in particular in the region of their inlet openings - each have a flow resistance which is detachably connected to the respective outlet tube.
  • the flow resistance can be adjusted later if necessary.
  • the flow resistances can also be replaced if they have become calcified or otherwise clogged after a long period of use.
  • the invention is based on the fact that immediately after the supply of coolant to the cooling beam is switched off, a state of equilibrium exists, but this state of equilibrium is unstable. If this state of equilibrium is disturbed even slightly - and such disturbances always occur in practice - the liquid coolant flows out of some of the outlet tubes, while air is sucked in through the other outlet tubes. The amounts of liquid coolant moving in the outlet tubes as a result are initially accelerated. The acceleration increases until the air sucked in through the other outlet tubes reaches the apex of the respective outlet tube. After that, the moving amounts of liquid coolant are accelerated further. The extent of the acceleration decreases, however. The acceleration reaches the value zero when the air sucked in in the initial section reaches the same height as the outlet opening of the respective outlet tube. This level represents another state of equilibrium, but one that is stable in contrast to the first-mentioned state of equilibrium.
  • h denotes the height by which the vertex of the respective outlet tube is above the outlet opening of the respective outlet tube
  • the inlet openings of the outlet tubes are above the level mentioned, approximately 1.5 h or 2 h below the outlet opening of the respective outlet tube, air can enter the cooling beam. This leads to increased coolant run-on. If, on the other hand, the inlet openings of the outlet tubes are at least at or below the level mentioned, approximately 1.5 h or 2 h below the outlet opening of the respective outlet tube, the vibrations are limited to the quantities of coolant in the outlet tubes. Only these very small quantities can still run-on.
  • the outlet tubes are placed on the top of the chilled beam. This allows the condition that the outlet openings are located above the chilled beam to be met in a particularly simple manner and in particular with a relatively low overall height of the chilled beam including outlet pipes.
  • the initial sections of the outlet tubes extend at least partially into the chilled beam. This allows the overall height of the chilled beam including the outlet tubes to be kept as low as possible.
  • the initial sections run vertically. This results in a particularly simple construction.
  • the middle sections are curved and each extend over a curvature angle of 150° to 180°. This makes it easy to maintain a laminar, almost vortex-free flow despite the reversal of the direction of the coolant's movement in the outlet tubes.
  • the length of the end section is 0. This allows the overall height of the chilled beam including the outlet tubes to be kept as low as possible.
  • the respective flow resistance reduces the available cross-section of the respective outlet tube compared to the cross-section of the respective outlet tube in the remaining area by 20% to 80%, in particular by 40% to 60%.
  • the flow resistance therefore has a significant effect.
  • the respective flow resistance is connected to the respective outlet tube via a screw connection, in particular screwed into the respective outlet tube. This makes subsequent adjustment of the flow resistance particularly easy.
  • outlet tubes - especially in their middle sections - have vent holes. However, this is usually not necessary.
  • a flat rolled stock 1 is to be cooled in a cooling section.
  • the flat rolled stock 1 consists of metal, whereby the term "metal" in the sense of the present invention also includes common, widely used alloys.
  • the flat rolled stock 1 can consist of steel or aluminum.
  • the flat rolled stock 1 can be a strip or a heavy plate, for example.
  • the cooling section can be arranged, for example, on the outlet side of a multi-stand finishing train.
  • the flat rolled stock 1 is conveyed through the cooling section in a transport direction x.
  • the cooling section has a conveyor section on which the flat rolled stock 1 is conveyed. For reasons of clarity, only one of the transport rollers 2 of the conveyor section is shown and even then only in FIG 2 .
  • At least one cooling beam 3 is provided for cooling the flat rolling stock 1.
  • the cooling beam 3 is arranged above the conveyor line.
  • a liquid coolant 5 is supplied to the cooling beam 3 via a supply line 4, with which the flat rolling stock 1 is to be cooled.
  • cooling beams can also be arranged below the cooling line, by means of which the liquid coolant 5 is applied to the flat rolling stock 1 from below.
  • these cooling beams are not the subject of the present invention as far as the mechanical and structural design of the cooling beams 3 is concerned. The following explanations on the mechanical and structural design of the cooling beams 3 therefore always refer to the cooling beam 3 above the conveyor line.
  • the cooling beam 3 extends essentially transversely to the transport direction x, i.e. in a transverse direction y.
  • the width b of the cooling beam 3 in the transverse direction y is usually between 1 m and 2 m. However, it can also be higher or lower.
  • the liquid coolant 5 is usually water or at least consists essentially of water (at least 98%).
  • the pressure at which the coolant 5 is fed to the cooling beam 3 is usually between 0 bar and 2 bar, usually around 0.8 bar.
  • the cooling beam 3 in this case is a laminar cooling beam.
  • the cooling beam 3 has a plurality of outlet tubes 6.
  • the outlet tubes 6 each have an inlet opening 7 and an outlet opening 8.
  • the outlet openings 8 are located above the cooling beam 3, ie above the highest point of the cooling beam 3.
  • a height distance h0 of the outlet openings 8 from the top of the chilled beam 3 should be at least 5 cm.
  • the outlet tubes 6 usually form two rows, with the two rows extending in the transverse direction y. In some cases, however, there is only a single row or more than two rows. If there are several rows, the rows are spaced apart from each other in the transport direction x. Within each row there are always several outlet tubes 6. In many cases there are at least 10, sometimes even 20 outlet tubes 6 and more. A distance a between the outlet tubes 6 (measured from the center of the outlet opening 8 to the center of the outlet opening 8 of the next outlet tube 6) is usually between approx. 4 cm and 5 cm. An inner diameter d of the outlet tubes 6 - see in particular FIG 5 - is usually between approx. 10 mm and approx. 20 mm.
  • the outlet tubes 6 are generally of the same design. The following is therefore based on FIG 4 only one of the outlet tubes 6 is explained in more detail. For the other outlet tubes 6, analogous explanations apply due to the similar design.
  • the outlet tube 6 is designed such that the liquid coolant 5 enters the respective outlet tube 6 from the cooling beam 3 via the inlet opening 7 of the outlet tube 6.
  • entry occurs directly from below.
  • the coolant 5 flows upwards in an initial section 9.
  • the initial section 9 can in particular run vertically.
  • the initial section 9 is followed by a middle section 10.
  • the liquid coolant 5 is diverted so that it flows - completely or at least essentially - downwards.
  • the middle section 10 can be curved with a uniform radius of curvature r. wherein the angle of curvature ⁇ covered by the central portion 10 is generally at least 150° and at most 180°.
  • the middle section 10 is followed by an end section 11.
  • the end section 11 extends to the outlet opening 8.
  • the liquid coolant 5 flows downwards, ideally vertically downwards.
  • the coolant 5 then exits downwards from the outlet tube 6 and falls from above onto the flat rolling stock 1.
  • the end section 11 can be longer or shorter. The shorter the end section 11 can be, the better. In extreme cases, the length of the end section 11 can be 0, so that the end section 11 is ultimately eliminated. As a result, this means that the outlet opening 8 can be directly connected to the middle section 10. This is not critical because the coolant 5 already flows from top to bottom in the area of the middle section 10 facing away from the start section 9.
  • the middle section 10 contains an apex 12 at which the coolant 5 flowing through the outlet tube 6 reaches a highest point.
  • the coolant 5 flows horizontally.
  • the apex 12 can, for example, correspond to the lowest point of the inner cross section of the outlet tube 6 at this point, the highest point of the inner cross section of the outlet tube 6 at this point or a point in between - in particular in the middle.
  • Both the inlet opening 7 and the outlet opening 8 are located below the vertex 12.
  • a height distance h1 of the inlet opening 7 from the vertex 12 is greater than a height distance h2 of the outlet opening 8 from the vertex 12.
  • the height distance h1 is at least twice as large as the height distance h2, for example 2.5 times as large. Preferably, it is at least three times as large.
  • the outlet tubes 6 are not only designed in the same way, but are also arranged uniformly.
  • the wording "arranged uniformly" in this context means that the vertices 12 are at a uniform height, that the height distances h1 are the same and that the height distances h2 are the same.
  • the inlet openings 7 are therefore also at a uniform height.
  • the vertices 12 can be approx. 15 cm above the upper edge of the cooling beam 3, the outlet openings 8 approx. 7.5 cm above the upper edge of the cooling beam 3 and the inlet openings 7 approx. 15 cm below the upper edge of the cooling beam 3.
  • the numerical values mentioned are purely examples. If the numerical values mentioned are realized, the ratio of the height distances h1, h2 to each other is still 4:1.
  • the outlet tubes 6 are as shown in the FIGS 1 to 3 placed on the top of the cooling beam 3.
  • the wording "placed on the top” is intended to mean that the outlet tubes 6 enter the cooling beam 3 from above. However, this does not mean that the outlet tubes 6 end at the top of the cooling beam 3. This is possible, but is preferred as shown in FIG 3 however, that the initial sections 9 of the outlet tubes 6 at least partially protrude into the cooling beam 3. Specifically, the outlet tubes 6 should protrude as far as possible into the cooling beam 3. This is especially true because this allows the ratio of the height distances h1, h2 to one another to be maximized without increasing the overall height of the cooling beam 3 including the outlet tubes 6.
  • the outlet tubes 6 have the same shape as shown in FIG 5 each have a flow resistance 13.
  • the flow resistance 13 acts individually for the respective outlet tube 6. It reduces the available cross-section of the respective outlet tube 6.
  • the available cross-section of the respective outlet tube 6 in the area of the flow resistance 13 can be between 20% and 80% of the cross-section of the respective outlet tube 6 in the remaining area.
  • the cross-section remaining in the area of the flow resistance 13 is between 40% and 60% of the cross-section in the remaining area of the respective outlet tube 6.
  • the flow resistance 13 can be as shown in FIG 5 in particular in the area of the inlet openings 7 of the outlet tubes 6.
  • the respective flow resistance 13 is detachably connected to the respective outlet tube 6.
  • the respective flow resistance 13 can be arranged as shown in FIG 5 be connected to the respective outlet tube 6 via a screw connection 14, in particular be screwed into the respective outlet tube 6.
  • the outlet tubes 6 are usually closed - with the exception of the respective inlet opening 7 and the respective outlet opening 8. However, it is possible that the outlet tubes 6 are closed as shown in FIG 6 - preferably in their middle sections 10 - have vent holes 15.
  • the vent holes 15, if present, are arranged on the top of the middle sections 10 and preferably near the respective apex 12. As a rule, however, the vent holes 15 are not required.
  • a control valve 16 is arranged in the supply line 4.
  • the amount of liquid coolant 5 supplied to the cooling beam 3 can be adjusted by means of the control valve 16.
  • the control valve 16 is connected to the supply line 4 as shown in FIG 1 an actuating device 17. By means of the actuating device 17, the control valve 16 can be completely open position to the fully closed position and vice versa.
  • the present invention has many advantages. In particular, it is achieved that after the supply of coolant 5 to the cooling beam 3 is shut off, only the amount of coolant 5 that is already in the outlet tubes 6 can flow out of the outlet tubes 6. In practice, this amount is usually a maximum of 1 l and is therefore a full order of magnitude (ie a factor of 10) smaller than in the prior art. Furthermore, no air from the environment can get into the cooling beam 3. The amount of coolant 5 supplied to the cooling beam 3 can be adjusted very precisely.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Metal Rolling (AREA)

Claims (9)

  1. Dispositif de refroidissement d'un produit laminé plan (1) en métal avec un réfrigérant liquide (5),
    - dans lequel le produit laminé plan (1) est transporté sur une voie de transport dans un sens de transport (x)
    - dans lequel le dispositif présente au moins une poutre de refroidissement (3) disposée au-dessus de la voie de transport, à laquelle le réfrigérant liquide (5) est amené par une conduite d'alimentation (4),
    - dans lequel la poutre de refroidissement (3) s'étend essentiellement transversalement au sens de transport (x) et présente une pluralité de petits tubes de sortie (6),
    - dans lequel les petits tubes de sortie (6) présentent à chaque fois une ouverture d'entrée (7) et une ouverture de sortie (8),
    - dans lequel le réfrigérant liquide (5) pénètre à partir de la poutre de refroidissement (3) dans le petit tube de sortie respectif (6) par l'ouverture d'entrée respective (7) et sort du petit tube de sortie respectif (6) par l'ouverture de sortie respective (8),
    - dans lequel le petit tube de sortie respectif (6), vu dans le sens d'écoulement du réfrigérant liquide (5), présente une section initiale (9) partant de l'ouverture d'entrée (7) et se dirigeant vers le haut, une section centrale (10) s'y raccordant et une section finale (11) s'y raccordant, se dirigeant vers le bas et s'étendant jusqu'à l'ouverture de sortie (8), de sorte que la section centrale (10) comporte un point culminant (12) au niveau duquel le réfrigérant (5) s'écoulant à travers le petit tube de sortie respectif (6) atteint un point le plus haut,
    - dans lequel les ouvertures de sortie (8) se trouvent au-dessus de la poutre de refroidissement (3) et un écart de hauteurs (h1) de l'ouverture d'entrée (7) depuis le point culminant (12) est au moins deux fois aussi grand, plus particulièrement au moins trois fois aussi grand, qu'un écart de hauteurs (h2) de l'ouverture de sortie (8) depuis le point culminant (12),
    caractérisé en ce que les petits tubes de sortie (6) - plus particulièrement dans la zone de leurs ouvertures d'entrée (7) - présentent à chaque fois une résistance à l'écoulement (13) qui est liée d'une manière amovible au petit tube de sortie respectif (6) .
  2. Dispositif selon la revendication 1, caractérisé en ce que les petits tubes de sortie (6) sont placés sur le côté supérieur de la poutre de refroidissement (3).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les sections initiales (9) des petits tubes de sortie (6) dépassent à l'intérieur au moins partiellement dans la poutre de refroidissement (3).
  4. Dispositif selon la revendication 1, 2 ou 3, caractérisé en ce que les sections initiales (9) passent verticalement.
  5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les sections centrales (10) sont recourbées et s'étendent à chaque fois sur un angle de courbure (α) de 150° à 180°.
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la longueur de la section finale (11) est 0.
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la résistance à l'écoulement (13) réduit la section transversale disponible du petit tube de sortie respectif (6) par rapport à la section transversale du petit tube de sortie respectif (6) dans la zone restante de 20 % à 80 %, plus particulièrement de 40 % à 60 %.
  8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la résistance à l'écoulement respective (13) est liée au petit tube de sortie respectif (6) par un assemblage par boulons (14), plus particulièrement est vissée dans le petit tube de sortie respectif (6).
  9. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les petits tubes de sortie (6) présentent des alésages d'aération (15) - plus particulièrement dans leurs sections centrales (10).
EP20711872.0A 2019-03-18 2020-03-13 Refroidissement d'un produit laminé plan sans arrêt retardé de la coulée Active EP3941654B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019106730.8A DE102019106730A1 (de) 2019-03-18 2019-03-18 Kühlung von flachem Walzgut ohne Nachlaufen des Headers
PCT/EP2020/056872 WO2020187749A1 (fr) 2019-03-18 2020-03-13 Refroidissement d'un produit laminé plan sans arrêt retardé de la coulée

Publications (3)

Publication Number Publication Date
EP3941654A1 EP3941654A1 (fr) 2022-01-26
EP3941654B1 true EP3941654B1 (fr) 2024-07-24
EP3941654C0 EP3941654C0 (fr) 2024-07-24

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ID=68886117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20711872.0A Active EP3941654B1 (fr) 2019-03-18 2020-03-13 Refroidissement d'un produit laminé plan sans arrêt retardé de la coulée

Country Status (5)

Country Link
US (1) US11548044B2 (fr)
EP (1) EP3941654B1 (fr)
CN (1) CN113543902A (fr)
DE (1) DE102019106730A1 (fr)
WO (1) WO2020187749A1 (fr)

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US20220088658A1 (en) 2022-03-24
US11548044B2 (en) 2023-01-10
CN113543902A (zh) 2021-10-22
EP3941654A1 (fr) 2022-01-26
EP3941654C0 (fr) 2024-07-24
DE102019106730A1 (de) 2020-01-02

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