EP0343103B1 - Method and apparatus for cooling an object - Google Patents

Method and apparatus for cooling an object Download PDF

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Publication number
EP0343103B1
EP0343103B1 EP89810325A EP89810325A EP0343103B1 EP 0343103 B1 EP0343103 B1 EP 0343103B1 EP 89810325 A EP89810325 A EP 89810325A EP 89810325 A EP89810325 A EP 89810325A EP 0343103 B1 EP0343103 B1 EP 0343103B1
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EP
European Patent Office
Prior art keywords
nozzle
gas
cooling
process according
liquid
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.)
Expired - Lifetime
Application number
EP89810325A
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German (de)
French (fr)
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EP0343103A1 (en
Inventor
Miroslaw Plata
Kurt Buxmann
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
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Publication date
Application filed by Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to AT89810325T priority Critical patent/ATE82171T1/en
Publication of EP0343103A1 publication Critical patent/EP0343103A1/en
Application granted granted Critical
Publication of EP0343103B1 publication Critical patent/EP0343103B1/en
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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
    • 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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0861—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with one single jet constituted by a liquid or a mixture containing a liquid and several gas jets
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching

Definitions

  • the invention relates to a method for cooling an object by spraying a gas / liquid mixture in the form of a mist onto the surface of the object by means of at least one nozzle.
  • Atomized air / water mixtures have the advantage of a lower explosion risk compared to the pure application of water when cooling continuous cast ingots, since the water mist hitting the surface can be adjusted in such a way that it practically completely evaporates.
  • Venturi nozzles of this type have the disadvantage that the amount of air required to form the water mist is extraordinarily large.
  • the cooling intensity on the surface exposed to the water mist is very different locally, since the surface area lying in the nozzle axis is cooled much more strongly than edge areas.
  • the inventor has set himself the goal of creating a method of the type mentioned at the outset with which the cooling effect can be improved while reducing the gas flow rate.
  • this is achieved in that a liquid jet is sprayed through the nozzle opening to form a spray with droplet size ⁇ 100 ⁇ m and after exiting the nozzle is acted upon by gas jets at an angle between 0 and 90 ° to the nozzle axis to accelerate and direct the droplets.
  • the procedure according to the invention enables the gas flow rate to be reduced by a multiple compared to a jet mixing process based on the Venturi nozzle.
  • the atomization of the liquid jet according to the invention and the acceleration of the droplets after the nozzle opening result in a uniform distribution of the cooling intensity over the surface of the liquid mist on the surface of the object to be cooled.
  • the intensity of the gas jets is regulated independently of one another. This makes it possible to change the direction of the conically atomized liquid jet formed after the nozzle opening over a wide range. With a given arrangement of nozzles, this enables the cooling of the object to be cooled to be fine-tuned.
  • Coolant Any coolant can be used as the cooling liquid, water being preferred in most cases.
  • Air can be used as the gas, but other gases such as nitrogen or argon can also be used.
  • the method is particularly suitable for cooling conventionally or electromagnetically cast strands as well as rolled and pressed products made of metal, in particular aluminum.
  • the method is also suitable for cooling hot surfaces with complete evaporation of the coolant, the cooling intensities preferably being between 500 and 3000 W / m2 ° K.
  • a device suitable for carrying out the method according to the invention is characterized by a liquid-carrying nozzle and gas guide channels arranged in the region of the nozzle opening at an angle between 0 and 90 ° to the nozzle axis.
  • two gas guide channels arranged symmetrically and concentrically to the nozzle axis are provided, which can be acted upon independently of one another by gas of different pressure.
  • gas jet arrangements with three or more gas guide channels are also possible, which are preferably also arranged symmetrically and concentrically to the nozzle axis.
  • a device R for cooling an object consists of a part 1 which has a water-carrying nozzle 3 with a nozzle opening 4 and which is penetrated by two diametrically opposite bores 5a, b for gas guidance.
  • the supply lines for water and air are shown schematically.
  • the part 1 is fitted into a counterpart 2 with the formation of cavities 6a, b in the form of ring segments and adjoining gas guide channels 7a, b.
  • the gas guide channels 7a, b form an angle ⁇ of, for example, 45 ° with the nozzle axis x.
  • the direction of the conical water jet 9 can be changed over a wide range.

Abstract

In the method, a gas/liquid mixture is sprayed in the form of a mist onto the surface of the object to be cooled. A jet of liquid is atomised by the nozzle orifice to form a spray mist with a particle size < 100 mu m and, after its emergence from the nozzle, is acted upon by gas jets at an angle ( alpha ) of between 0 and 90 DEG to the nozzle axis (x) for the purpose of acceleration and direction. The intensity of the gas jets can be controlled independently of one another. The method is suitable for cooling conventionally or electromagnetically cast strands and for rolled and pressed products made of metal, especially aluminium. <??>An apparatus suitable for carrying out the method essentially comprises a part (1) which contains the nozzle (3) guiding the liquid and holes (5a, b) for guiding the gas and, to form gas-guiding channels (7a, b), is fitted into a mating part (2). <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Kühlen eines Gegenstandes durch Aufsprühen eines Gas/Flüssigkeit-Gemisches in der Form eines Nebels auf die Oberfläche des Gegenstandes mittels wenigstens einer Düse.The invention relates to a method for cooling an object by spraying a gas / liquid mixture in the form of a mist onto the surface of the object by means of at least one nozzle.

Verdüste Luft/Wasser-Gemische haben im Vergleich zur reinen Wasserbeaufschlagung bei der Kühlung von Stranggussbarren den Vorteil einer geringeren Explosionsgefahr, da der auf die Oberfläche auftreffende Wassernebel derart eingestellt werden kann, dass er praktisch vollständig verdampft.Atomized air / water mixtures have the advantage of a lower explosion risk compared to the pure application of water when cooling continuous cast ingots, since the water mist hitting the surface can be adjusted in such a way that it practically completely evaporates.

Bekannte Düsensysteme beruhen auf dem Prinzip des Venturirohrs, wo die Bildung des Luft/Wasser-Gemisches bereits innerhalb der Düse erfolgt. Derartige Venturidüsen haben den Nachteil, dass die benötigte Luftmenge zur Bildung des Wassernebels ausserordentlich gross ist. Hinzu kommt, dass die Kühlintensität an der mit dem Wassernebel beaufschlagten Fläche lokal sehr unterschiedlich ist, da der in der Düsenachse liegende Flächenbereich gegenüber Randbereichen viel stärker gekühlt wird.Known nozzle systems are based on the principle of the Venturi tube, where the air / water mixture is already formed inside the nozzle. Venturi nozzles of this type have the disadvantage that the amount of air required to form the water mist is extraordinarily large. In addition, the cooling intensity on the surface exposed to the water mist is very different locally, since the surface area lying in the nozzle axis is cooled much more strongly than edge areas.

Angesichts dieser Gegebenheiten hat sich der Erfinder das Ziel gesetzt, ein Verfahren der eingangs erwähnten Art zu schaffen, mit welchem die Kühlwirkung unter gleichzeitiger Verminderung der Gasdurchflussmenge verbessert werden kann.In view of these circumstances, the inventor has set himself the goal of creating a method of the type mentioned at the outset with which the cooling effect can be improved while reducing the gas flow rate.

Erfindungsgemäss wird die dadurch gelöst, bei dass ein Flüssigkeitsstrahl durch die Düsenöffnung zu einem Sprühnebel mit Tröpfchengrösse<100µm verdüst und nach dem Austritt aus der Düse zur Beschleunigung und Richtungslenkung der Tröpfchen mit Gasstrahlen in einem Winkel zwischen 0 und 90° zur Düsenachse beaufschlagt wird.According to the invention this is achieved in that a liquid jet is sprayed through the nozzle opening to form a spray with droplet size <100 μm and after exiting the nozzle is acted upon by gas jets at an angle between 0 and 90 ° to the nozzle axis to accelerate and direct the droplets.

Durch die erfindungsgemässe Verfahrensweise kann die Gasdurchflussmenge gegenüber einem Strahlmischverfahren auf der Grundlage der Venturidüse um ein mehrfaches gesenkt werden. Ueberraschenderweise hat sich zudem gezeigt, dass sich durch das erfindungsgemässe Verdüsen des Flüssigkeitsstrahls und die Beschleunigung der Tröpfchen nach der Düsenöffnung eine über die Auftreffläche des Flüssigkeitsnebels auf der Oberfläche des zu kühlenden Gegenstandes gleichmässige Verteilung der Kühlintensität ergibt.The procedure according to the invention enables the gas flow rate to be reduced by a multiple compared to a jet mixing process based on the Venturi nozzle. Surprisingly, it has also been found that the atomization of the liquid jet according to the invention and the acceleration of the droplets after the nozzle opening result in a uniform distribution of the cooling intensity over the surface of the liquid mist on the surface of the object to be cooled.

Bei einer bevorzugten Durchführung des Verfahrens wird die Intensität der Gasstrahlen unabhängig voneinander geregelt. Dadurch wird es möglich, die Richtung des nach der Düsenöffnung gebildeten, kegelförmig verdüsten Flüssigkeitsstrahls in weiten Bereichen zu verändern. Dies ermöglicht bei einer gegebenen Anordnung von Düsen eine Feineinstellung der Kühlung am zu kühlenden Gegenstand.In a preferred implementation of the method, the intensity of the gas jets is regulated independently of one another. This makes it possible to change the direction of the conically atomized liquid jet formed after the nozzle opening over a wide range. With a given arrangement of nozzles, this enables the cooling of the object to be cooled to be fine-tuned.

Als Kühlflüssigkeit kann ein beliebiges Kühlmittel verwendet werden, wobei in den meisten Fällen Wasser bevorzugt wird.Any coolant can be used as the cooling liquid, water being preferred in most cases.

Als Gas bietet sich die Verwendung von Luft an, jedoch können auch andere Gase wie Stickstoff oder Argon eingesetzt werden.Air can be used as the gas, but other gases such as nitrogen or argon can also be used.

Das Verfahren eignet sich insbesondere zum Kühlen von konventionell oder elektromagnetisch gegossenen Strängen sowie Walz- und Pressprodukten aus Metall, insbesondere Aluminium.The method is particularly suitable for cooling conventionally or electromagnetically cast strands as well as rolled and pressed products made of metal, in particular aluminum.

Bei Pressprofilen mit Querschnittsdimensionen unterschiedlicher Dicke ist eine Anpassung der Kühlintensität zur Vermeidung von nachträglichen Richtoperationen besonders wünschenswert. Mit einer vorgängig berechneten Anordnung mehrerer Düsen und der anschliessenden Feinregulierung der Kühlintensität durch unterschiedlich starke Einstellung der Gasstrahlen kann eine verzugsfreie Herstellung von Pressprofilen erzielt werden.In the case of press profiles with cross-sectional dimensions of different thicknesses, an adjustment of the cooling intensity to avoid subsequent straightening operations is particularly desirable. With a previously calculated arrangement of several nozzles and the subsequent fine adjustment of the cooling intensity by setting the Gas jets can achieve a distortion-free production of pressed profiles.

Das Verfahren eignet sich auch zum Kühlen heisser Oberflächen mit vollständiger Verdampfung des Kühlmittels, wobei die Kühlintensitäten bevorzugt zwischen 500 und 3000 W/m²°K liegen.The method is also suitable for cooling hot surfaces with complete evaporation of the coolant, the cooling intensities preferably being between 500 and 3000 W / m² ° K.

Eine weitere Anwendungsmöglichkeit des erfindungsgemässen Verfahrens wird darin gesehen, dass der zu kühlende Gegenstand (z.B. Pressprofile, Walzbänder, umlaufende Walzzylinder) an einem feststehenden Düsensystem vorbeigeführt wird, wobei die Kühlwirkung mit vollständiger Verdampfung des Kühlmittels erfolgt und die Wärmeübergangszahl des zu kühlenden Gegenstandes einer vorgegebenen Sollkurve folgt.
Eine zur Durchführung des erfindungsgemässen Verfahrens geeignete Vorrichtung ist gekennzeichnet durch eine flüssigkeitsführende Düse und im Bereich der Düsenöffnung in einem Winkel zwischen 0 und 90° zur Düsenachse angeordnete Gasführungskanäle.Another possible application of the method according to the invention is seen in the fact that the object to be cooled (e.g. press profiles, rolling belts, rotating rolling cylinders) is guided past a fixed nozzle system, the cooling effect taking place with complete evaporation of the coolant and the heat transfer coefficient of the object to be cooled according to a predetermined desired curve follows.
A device suitable for carrying out the method according to the invention is characterized by a liquid-carrying nozzle and gas guide channels arranged in the region of the nozzle opening at an angle between 0 and 90 ° to the nozzle axis.

Im einfachsten Fall sind zwei symmetrisch und konzentrisch zur Düsenachse angeordnete Gasführungskanäle vorgesehen, die unabhängig voneinander mit Gas unterschiedlichen Druckes beaufschlagt werden können. Selbstverständlich sind auch andere Gasstrahlanordnungen mit drei oder mehr Gasführungskanälen möglich, die vorzugsweise ebenfalls symmetrisch und konzentrisch zur Düsenachse angeordnet sind.In the simplest case, two gas guide channels arranged symmetrically and concentrically to the nozzle axis are provided, which can be acted upon independently of one another by gas of different pressure. Of course, other gas jet arrangements with three or more gas guide channels are also possible, which are preferably also arranged symmetrically and concentrically to the nozzle axis.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Betrachtung eines bevorzugten Ausführungsbeispiels sowie anhand der Zeichnung; diese zeigt in

  • Fig.1 einen schematisierten Querschnitt durch eine geeignete Vorrichtung zur Durchfuhrung der erfindungsgemässen Verfahrens ;
  • Fig.2 eine Draufsicht auf die Vorrichtung von Fig.1.
Further advantages, features and details of the invention result from the following consideration of a preferred exemplary embodiment and from the drawing; this shows in
  • 1 shows a schematic cross section through a suitable device for carrying out the method according to the invention;
  • 2 shows a plan view of the device from FIG.

Eine Vorrichtung R zum Kühlen eines Gegenstandes besteht aus einem eine wasserführende Düse 3 mit Düsenöffnung 4 aufweisenden Teil 1, welches mit zwei einander diametral gegenüberliegenden Bohrungen 5a,b zur Gasführung durchsetzt ist. In der Zeichnung sind die Zuführungsleitungen für Wasser und Luft schematisch angegeben. Das Teil 1 ist unter Bildung von ringsegmentförmigen Hohlräumen 6a,b und daran anschliessenden Gasführungskanälen 7a,b in ein Gegenstück 2 eingepasst. Die Gasführungskanäle 7a,b schliessen mit der Düsenachse x einen Winkel α von beispielsweise 45° ein.A device R for cooling an object consists of a part 1 which has a water-carrying nozzle 3 with a nozzle opening 4 and which is penetrated by two diametrically opposite bores 5a, b for gas guidance. In the drawing, the supply lines for water and air are shown schematically. The part 1 is fitted into a counterpart 2 with the formation of cavities 6a, b in the form of ring segments and adjoining gas guide channels 7a, b. The gas guide channels 7a, b form an angle α of, for example, 45 ° with the nozzle axis x.

Durch unterschiedliche Druckbeaufschlagung der Bohrungen 5a,b kann die Richtung des kegelförmig verdüsten Wasserstrahls 9 in einem weiten Bereich verändert werden.Through different pressurization of the bores 5a, b, the direction of the conical water jet 9 can be changed over a wide range.

Claims (7)

  1. Process for cooling an object by spraying a gas/liquid mixture in the form of a mist onto the surface of the object by means of at least one nozzle, characterised in that a liquid jet is atomised through the nozzle opening to form a spray mist with droplet size < 100 µm and after leaving the nozzle is contacted by gas jets at an angle (α) between 0 and 90° to the nozzle axis (x) to accelerate and steer the direction of the droplets.
  2. Process according to claim 1, characterised in that the intensity of each gas jet is controlled independently of the other.
  3. Process according to one of claims 1 and 2, characterised in that air is used as the gas.
  4. Process according to one of claims 1 to 3, characterised in that water is used as the liquid.
  5. Use of the process according to claim 1 for cooling strands cast conventionally or electromagnetically as well as rolled and pressed products made from metal, in particular aluminium.
  6. Use of the process according to claim 1 for cooling hot surfaces with complete evaporation of the coolant, preferably at cooling intensities of 500-3,000 W/m²°K.
  7. Use of the process according to claim 1 for cooling objects which are guided past a fixed nozzle system, wherein the cooling effect takes place with complete evaporation of the coolant and the heat transfer coefficient of the object to be cooled follows a given theoretical curve.
EP89810325A 1988-05-19 1989-05-01 Method and apparatus for cooling an object Expired - Lifetime EP0343103B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89810325T ATE82171T1 (en) 1988-05-19 1989-05-01 METHOD AND DEVICE FOR COOLING AN OBJECT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH191088 1988-05-19
CH1910/88 1988-05-19

Publications (2)

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EP0343103A1 EP0343103A1 (en) 1989-11-23
EP0343103B1 true EP0343103B1 (en) 1992-11-11

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EP89810325A Expired - Lifetime EP0343103B1 (en) 1988-05-19 1989-05-01 Method and apparatus for cooling an object

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US (1) US4934445A (en)
EP (1) EP0343103B1 (en)
JP (1) JP2647198B2 (en)
AT (1) ATE82171T1 (en)
AU (1) AU619293B2 (en)
CA (1) CA1316969C (en)
DE (1) DE58902656D1 (en)
IS (1) IS1566B (en)
NO (1) NO174614C (en)

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WO2017133867A1 (en) 2016-02-05 2017-08-10 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Continuous flow cooling device and method for cooling a metal strip
DE102018115879A1 (en) 2018-06-29 2020-01-23 Uwe Richter Method and device for contour-like tempering of shell-shaped molds

Also Published As

Publication number Publication date
IS3467A7 (en) 1989-11-20
ATE82171T1 (en) 1992-11-15
JPH0225671A (en) 1990-01-29
US4934445A (en) 1990-06-19
NO891950D0 (en) 1989-05-16
CA1316969C (en) 1993-04-27
EP0343103A1 (en) 1989-11-23
NO891950L (en) 1989-11-20
NO174614B (en) 1994-02-28
AU619293B2 (en) 1992-01-23
DE58902656D1 (en) 1992-12-17
AU3502989A (en) 1989-11-23
JP2647198B2 (en) 1997-08-27
NO174614C (en) 1994-06-08
IS1566B (en) 1994-12-13

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