EP0038319B1 - Method of and arrangement for recovering the heat of a continuously cast strand - Google Patents

Method of and arrangement for recovering the heat of a continuously cast strand Download PDF

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Publication number
EP0038319B1
EP0038319B1 EP81890060A EP81890060A EP0038319B1 EP 0038319 B1 EP0038319 B1 EP 0038319B1 EP 81890060 A EP81890060 A EP 81890060A EP 81890060 A EP81890060 A EP 81890060A EP 0038319 B1 EP0038319 B1 EP 0038319B1
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Prior art keywords
cooling chamber
coolant
flow
heat
medium
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EP81890060A
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German (de)
French (fr)
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EP0038319A1 (en
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Aktiengesellschaft Voest-Alpine
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Voestalpine AG
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Voestalpine AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • 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
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal

Definitions

  • the invention relates to a method for extracting heat from a cast strand cast in a continuous casting process, which is passed through a cooling chamber and brought into direct contact with a coolant which partially evaporates.
  • the coolant vapor generated inside the cooling chamber has previously been removed (DE-PS 2 117 621) by means of a fan through a chimney from the continuous casting plant and the hall surrounding this plant.
  • the continuous caster is kept free of steam, but a great mechanical effort is required for steam extraction, which also requires energy consumption.
  • the discharge of the steam into the open is a negative environmental impact.
  • the steam that is released into the open is lost as a coolant, so that the coolant must be continuously replenished.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to provide a method and a device for carrying out the method, which make it possible to gain and use at least a part of the sensible heat of the cast strand, whereby the coolant vapor is extracted superfluous and a leakage of coolant vapor into the hall is avoided.
  • This object is achieved in that the coolant vapor is brought into heat exchange with a closed surface condenser arranged inside the cooling chamber and a flow medium of the surface condenser is brought into further heat exchange with a heat converter arranged outside the cooling chamber.
  • the flow medium is advantageously conducted in a closed circuit independently of the coolant.
  • the coolant is conducted in a closed circuit, the condensate being used again in part to cool the strand surface and in part as a flow medium for the surface condenser, and the flow medium emerging from the heat converter is also used partly for cooling the strand surface and partly as Flow medium used for the condenser.
  • a device for carrying out the method in a continuous caster, in particular in a continuous slab caster, with a closed cooling chamber in which the secondary cooling zone for the cast strand with spray nozzles directed against the cast strand are provided for the coolant is characterized in that at least one of a closed surface condenser through which a flow medium is provided, which is connected to at least one heat converter arranged outside the cooling chamber.
  • the surface condenser is preferably connected to the heat converter to form a closed circuit.
  • a plurality of surface condensers are connected in series within the cooling chamber.
  • a plurality of surface condensers are connected in parallel within the cooling chamber.
  • the surface condensers are arranged on the ceiling of the cooling chamber and the side walls of the cooling chamber are covered with an insulating or sealing film, a surface condenser as the cooling chamber-covered plate through which the flow medium flows, with deflection bars provided on the inside, and another surface condenser as Pipe coil lying directly below the plate are formed.
  • the surface condensers are connected in parallel with the heat converter to the coolant flow in the secondary cooling zone within the cooling chamber.
  • FIG. 1 shows a section through a cooling chamber of a slab caster
  • FIG. 2 a detail of this section on an enlarged scale according to one embodiment
  • 3 shows the flow diagram for the flow medium according to a second embodiment.
  • FIG. 1 designates a water-cooled mold with a slab cross-section, which is arranged at the level of the casting platform designated 2.
  • Below the mold are the strand shell of the cast strand 3 supporting strand guide rollers 4, which are rotatably mounted in a frame, not shown.
  • the steel strand 3 deflected into the horizontal in a quarter-circle arc is surrounded by a cooling chamber 5 which is closed on all sides, it emerges from the cooling chamber through an opening 6 and then arrives at a subsequent horizontal strand guide zone (not shown).
  • Feed lines 7 for a coolant project into the cooling chamber and are sprayed against the steel strand surfaces by means of nozzles 8 arranged between the rollers 4.
  • the ceiling 9 of the cooling chamber is designed as a closed surface condenser, namely as a hollow plate with deflection webs 10 provided in its interior, as a result of which meandering coolant channels 11 which are arranged distributed over the plate are formed.
  • a meandering pipe coil 12 is provided below this plate.
  • the coolant channels 11 and the coil 12 are connected to one another via their supply lines 13, 14 and a three-way valve 15.
  • the drain lines 16 and 17 of the plate 9 and the coil 12 are connected to each other by means of two three-way valves 18 and 19.
  • a branch line 20 leads from the three-way valve 19 to the coolant supply line 14 of the pipe coil 12.
  • the flow medium which has flowed through the plate or the pipe coil is fed to a heat converter 21, which can also be designed as a boiler.
  • the flow medium enters the cooling chamber 5 via a return line 22.
  • the bottom of the cooling chamber 5 has a scale channel 23, from the end of which a line 24 leads the secondary cooling water to a schematically illustrated water treatment system 25. From this water treatment plant, the secondary cooling water is fed to the feed lines 7 by means of a pump 26 via the line 27.
  • the sheet metal walls 28 of the cooling chamber 5 are lined on the inside with an insulating and sealing film 29.
  • the film fastenings 30 shown schematically in FIG. 2 are mounted on the sheet metal walls 28.
  • the cooling chamber 5 is surrounded on the outside by support beams 31.
  • the function of the device is as follows: The for cooling the strand part located within the cooling chamber 5, i. H. Coolant provided for the secondary cooling zone is sprayed via lines 7 and spray nozzles 8 onto the strand surface, where it partially evaporates. A part of the coolant is supplied via the supply lines 13, 14 as the flow medium of the plate 9 and the coil 12.
  • the plate 9 and the coil 12 can be connected either in parallel or in series, depending on the position of the three-way cocks.
  • the parallel connection is symbolized in Fig. 3 with fully drawn arrows, the series connection with arrows drawn in dashed lines.
  • the coolant vapor generated within the cooling chamber 5 is condensed on the pipe coil 12 through which the flow medium flows and on the plate 9 also through which the flow medium flows, and drips off. If the plate and the flow coil are connected in series, the highest possible temperature of the flow medium can be achieved, however, with a parallel connection, a larger amount of the flow medium can be achieved with a lower temperature than the series connection.
  • the condensation heat given off to the flow medium is given off in the heat converter 21 arranged outside the cooling chamber to a heating medium, for example useful water for building heating etc.
  • the flow medium then reaches the cooling chamber 5 via the return line 22; it could also be fed directly to the water treatment system 25.
  • the flow medium flowing through the plate 9 or the coil 12 is guided in a closed circuit independently of the coolant used for the secondary cooling.
  • the line 22 'emerging from the heat converter 21 is therefore connected with the interposition of a feed pump 32 to the three-way valve 15 connecting the lines 13, 14.
  • the method according to the invention has other advantages, such as. B. saves the complex mechanics for steam extraction, resulting in cost and energy savings. There are also no shafts for steam extraction in the area of the steel structure of the hall, which simplifies hall construction.
  • the secondary cooling water can be circulated;
  • the loss of coolant is extremely low or can be prevented at all, so that there is the possibility of using a treated (decalcified) cooling water.
  • Untreated cooling water leads to heavy limescale deposits in the spray nozzles and on the system components. This disadvantage can thus be eliminated.
  • Another advantage is the fact that the cooling chamber can be made much simpler, since there is no longer any negative pressure inside the cooling chamber and the tightness of the cooling chamber is taken over by a film.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Continuous Casting (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Gewinnung der Wärme von einem im Stranggießverfahren gegossenen Gußstrang, der durch eine Kühlkammer geführt und in direkten Kontakt mit einem Kühlmittel gebracht wird, welches teilweise verdampft.The invention relates to a method for extracting heat from a cast strand cast in a continuous casting process, which is passed through a cooling chamber and brought into direct contact with a coolant which partially evaporates.

Der innerhalb der Kühlkammer entstehende Kühlmitteldampf wurde bisher (DE-PS 2 117 621) mittels eines Ventilators durch einen Kamin aus der Stranggießanlage und der diese Anlage umgebenden Halle abgeführt. Dadurch wird zwar die Stranggießanlage von Dampf frei gehalten, jedoch benötigt man für die Dampfabsaugung einen großen mechanischen Aufwand, der auch einen Energieverbrauch bedingt. Abgesehen davon stellt das Ableiten des Dampfes ins Freie eine negative Umweltbeeinflussung dar. Dazu kommt noch, daß der ins Freie gelangende Dampf als Kühlmittel verloren ist, so daß das Kühlmittel laufend ergänzt werden muß.The coolant vapor generated inside the cooling chamber has previously been removed (DE-PS 2 117 621) by means of a fan through a chimney from the continuous casting plant and the hall surrounding this plant. As a result, the continuous caster is kept free of steam, but a great mechanical effort is required for steam extraction, which also requires energy consumption. Apart from this, the discharge of the steam into the open is a negative environmental impact. In addition, the steam that is released into the open is lost as a coolant, so that the coolant must be continuously replenished.

Es ist weiters zur Vermeidung des Einhüllens einer Stranggießanlage in eine Dampfwolke aus der CH-PS 333085 bekannt, an der Nachkühlstrecke eine Abdeckung vorzusehen, an der sich der kondensierte Dampf niederschlägt und abfließt. Zur Steigerung dieser Wirkung kann gemäß der CH-PS 333 805 der Dampf zusätzlich abgesaugt und einem Kondensator zugeführt werden. Für moderne Stranggießanlagen, insbesondere Brammenstranggießanlagen, mit großer Gießgeschwindigkeit kann mit dieser bekannten Dampfniederschlagung nicht das Auslangen gefunden werden, d. h. die Dampfkondensation ist nicht ausreichend und es würde infolge der großen umzusetzenden Wärmemengen Dampf in die Halle gelangen und die Anlage trotz Abdeckung in eine Dampfwolke hüllen. Eine Absaugung des Dampfes bedingt wiederum einen großen mechanischen Aufwand und einen ständigen Energieverbrauch.In order to avoid enveloping a continuous casting installation in a steam cloud, it is also known from CH-PS 333085 to provide a cover on the after-cooling section, on which the condensed steam condenses and flows off. In order to increase this effect, according to CH-PS 333 805 the steam can also be suctioned off and fed to a condenser. For modern continuous casting plants, in particular slab continuous casting plants, with a high casting speed, this known vapor deposition cannot be sufficient, i. H. the steam condensation is not sufficient and, due to the large amounts of heat to be converted, steam would enter the hall and, despite being covered, would envelop the system in a steam cloud. Sucking off the steam in turn requires great mechanical effort and constant energy consumption.

Die Erfindung bezweckt die Vermeidung dieser Nachteile und Schwierigkeiten und stellt sich die Aufgabe, ein Verfahren sowie eine Einrichtung zur Durchführung des Verfahrens anzugeben, welche es ermöglichen, zumindest einen Teil der fühlbaren Wärme des Gußstranges zu gewinnen und zu nutzen, wobei sich ein Absaugen des Kühlmitteldampfes erübrigt und ein Auswallen von Kühlmitteldampf in die Halle vermieden wird.The invention aims to avoid these disadvantages and difficulties and has as its object to provide a method and a device for carrying out the method, which make it possible to gain and use at least a part of the sensible heat of the cast strand, whereby the coolant vapor is extracted superfluous and a leakage of coolant vapor into the hall is avoided.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Kühlmitteldampf mit einem innerhalb der Kühlkammer angeordneten geschlossenen Oberflächenkondensator in Wärmeaustausch gebracht und ein Durchflußmedium des Oberflächenkondensators mit einem außerhalb der Kühlkammer angeordneten Wärmeumsetzer in weiteren Wärmeaustausch gebracht wird.This object is achieved in that the coolant vapor is brought into heat exchange with a closed surface condenser arranged inside the cooling chamber and a flow medium of the surface condenser is brought into further heat exchange with a heat converter arranged outside the cooling chamber.

Um stets dasselbe aufbereitete Durchflußmedium verwenden zu können, wird vorteilhaft das Durchflußmedium in einem geschlossenen Kreislauf unabhängig vom Kühlmittel geführt.In order to always be able to use the same processed flow medium, the flow medium is advantageously conducted in a closed circuit independently of the coolant.

Vorzugsweise wird das Kühlmittel in einem geschlossenen Kreislauf geführt, wobei das Kondensat zum Teil abermals zur Kühlung der Strangoberfläche und zum Teil als Durchflußmedium für den Oberflächenkondensator verwendet wird, und wird das aus dem Wärmeumsetzer austretende Durchflußmedium ebenfalls zum Teil zur Kühlung der Strangoberfläche und zum Teil als Durchflußmedium für den Kondensator verwendet.Preferably, the coolant is conducted in a closed circuit, the condensate being used again in part to cool the strand surface and in part as a flow medium for the surface condenser, and the flow medium emerging from the heat converter is also used partly for cooling the strand surface and partly as Flow medium used for the condenser.

Eine Einrichtung zur Durchführung des Verfahrens bei einer Stranggießanlage, insbesondere bei einer Brammenstranggießanlage, mit einer geschlossenen Kühlkammer, in der die Sekundärkühlzone für den Gußstrang mit gegen den Gußstrang gerichteten Sprühdüsen für das Kühlmittel vorgesehen sind, ist dadurch gekennzeichnet, daß innerhalb der Kühlkammer mindestens ein von einem Durchflußmedium durchflossener, geschlossener Oberflächenkondensator vorgesehen ist, der mit mindestens einem außerhalb der Kühlkammer angeordneten Wärmeumsetzer verbunden ist.A device for carrying out the method in a continuous caster, in particular in a continuous slab caster, with a closed cooling chamber in which the secondary cooling zone for the cast strand with spray nozzles directed against the cast strand are provided for the coolant, is characterized in that at least one of a closed surface condenser through which a flow medium is provided, which is connected to at least one heat converter arranged outside the cooling chamber.

Vorzugsweise ist der Oberflächenkondensator mit dem Wärmeumsetzer zu einem geschlossenen Kreislauf verbunden.The surface condenser is preferably connected to the heat converter to form a closed circuit.

Um für das Durchflußmedium eine möglichst hohe Temperatur zu erreichen, sind innerhalb der Kühlkammer eine Mehrzahl von Oberflächenkondensatoren in Serie geschaltet.In order to achieve the highest possible temperature for the flow medium, a plurality of surface condensers are connected in series within the cooling chamber.

Soll das Durchflußmedium auf niedrigerer Temperatur gehalten werden, sind innerhalb der Kühlkammer eine Mehrzahl von Oberflächenkondensatoren parallel geschaltet.If the flow medium is to be kept at a lower temperature, a plurality of surface condensers are connected in parallel within the cooling chamber.

Nach einer bevorzugten Ausführungsform sind die Oberflächenkondensatoren an der Decke der Kühlkammer angeordnet und die Seitenwände der Kühlkammer mit einer Isolations- bzw. Dichtfolie bedeckt, wobei zweckmäßig ein Oberflächenkondensator als die Kühlkammer bedeckende, vom Durchflußmedium durchflossene Platte mit im Inneren vorgesehenen Umlenkstegen und ein weiterer Oberflächenkondensator als unmittelbar unterhalb der Platte liegende Rohrschlange ausgebildet sind.According to a preferred embodiment, the surface condensers are arranged on the ceiling of the cooling chamber and the side walls of the cooling chamber are covered with an insulating or sealing film, a surface condenser as the cooling chamber-covered plate through which the flow medium flows, with deflection bars provided on the inside, and another surface condenser as Pipe coil lying directly below the plate are formed.

Es ist weiters von Vorteil, wenn die Oberflächenkondensatoren mit dem Wärmeumsetzer parallel geschaltet sind zu dem Kühlmittelfluß in der Sekundärkühlzone innerhalb der Kühlkammer.It is also advantageous if the surface condensers are connected in parallel with the heat converter to the coolant flow in the secondary cooling zone within the cooling chamber.

Die Erfindung ist nachfolgend anhand zweier in der Zeichnung schematisch dargestellter Ausführungsbeispiele näher erläutert, wobei Fig. 1 einen Schnitt durch eine Kühlkammer einer Brammenstranggießanlage und Fig. 2 ein Detail dieses Schnittes in vergrößertem Maßstab gemäß einer Ausführungsform zeigen. In Fig. 3 ist das Fließschema für das Durchflußmedium nach einer zweiten Ausführungsform dargestellt.The invention is explained in more detail below with reference to two exemplary embodiments shown schematically in the drawing, FIG. 1 showing a section through a cooling chamber of a slab caster and FIG. 2 a detail of this section on an enlarged scale according to one embodiment. 3 shows the flow diagram for the flow medium according to a second embodiment.

Mit 1 ist eine wassergekühlte Kokille mit Brammenquerschnitt bezeichnet, die in Höhe der mit 2 bezeichneten Gießbühne angeordnet ist. Unterhalb der Kokille befinden sich die Strangschale des Gußstranges 3 stützende Strangführungsrollen 4, die in einem nicht dargestellten Gerüst drehbar gelagert sind. Der in einem Viertelkreisbogen in die Horizontale umgelenkte Stahlstrang 3 ist von einer allseits geschlossenen Kühlkammer 5 umgeben, er tritt durch eine Öffnung 6 aus der Kühlkammer aus und gelangt anschließend zu einer nachfolgend angeordneten, nicht dargestellten horizontalen Strangführungszone. In die Kühlkammer ragen Zuführungsleitungen 7 für ein Kühlmittel (vorzugsweise aufbereitetes Kühlwasser), welches mittels zwischen den Rollen 4 angeordneter Düsen 8 gegen die Stahlstrangoberflächen gesprüht wird. Die Decke 9 der Kühlkammer ist als geschlossener Oberflächenkondensator, nämlich als hohle Platte mi in ihrem Inneren vorgesehenen Umlenkstegen 10 ausgebildet, wodurch über die Platte verteilt angeordnete, meanderförmige Kühlmittelkanäle 11 gebildet sind. Unterhalb dieser Platte ist ein weiterer geschlossener Oberflächenkondensator, u. zw. eine meanderförmig verlegte Rohrschlange 12 vorgesehen. Die Kühlmittelkanäle 11 und die Rohrschlange 12 stehen über ihre Zuleitungen 13, 14 und einem Dreiwegehahn 15 miteinander in Verbindung. Die Abflußleitungen 16 bzw. 17 der Platte 9 und der Rohrschlange 12 sind miteinander mittels zweier Dreiwegehähne 18 und 19 verbunden. Von dem Dreiwegehahn 19 führt eine Nebenleitung 20 zur Kühlmittelzuführungsleitung 14 der Rohrschlange 12. Vom Dreiwegehahn 18 wird das Durchflußmedium, welches die Platte bzw. die Rohrschlange durchflossen hat, einem Wärmeumsetzer 21, der auch als Boiler ausgebildet sein kann, zugeführt. Über eine Rücklaufleitung 22 gelangt das Durchflußmedium in die Kühlkammer 5. Der Boden der Kühlkammer 5 weist einen Zunderkanal 23 auf, von dessen Ende eine Leitung 24 das Sekundärkühlwasser zu einer schematisch dargestellten Wasseraufbereitungsanlage 25 führt. Von dieser Wasseraufbereitungsanlage wird das Sekundärkühlwasser mittels einer Pumpe 26 über die Leitung 27 den Zuführungsleitungen 7 zugeleitet.1 designates a water-cooled mold with a slab cross-section, which is arranged at the level of the casting platform designated 2. Below the mold are the strand shell of the cast strand 3 supporting strand guide rollers 4, which are rotatably mounted in a frame, not shown. The steel strand 3 deflected into the horizontal in a quarter-circle arc is surrounded by a cooling chamber 5 which is closed on all sides, it emerges from the cooling chamber through an opening 6 and then arrives at a subsequent horizontal strand guide zone (not shown). Feed lines 7 for a coolant (preferably treated cooling water) project into the cooling chamber and are sprayed against the steel strand surfaces by means of nozzles 8 arranged between the rollers 4. The ceiling 9 of the cooling chamber is designed as a closed surface condenser, namely as a hollow plate with deflection webs 10 provided in its interior, as a result of which meandering coolant channels 11 which are arranged distributed over the plate are formed. Below this plate is another closed surface capacitor, u. between a meandering pipe coil 12 is provided. The coolant channels 11 and the coil 12 are connected to one another via their supply lines 13, 14 and a three-way valve 15. The drain lines 16 and 17 of the plate 9 and the coil 12 are connected to each other by means of two three-way valves 18 and 19. A branch line 20 leads from the three-way valve 19 to the coolant supply line 14 of the pipe coil 12. From the three-way valve 18, the flow medium which has flowed through the plate or the pipe coil is fed to a heat converter 21, which can also be designed as a boiler. The flow medium enters the cooling chamber 5 via a return line 22. The bottom of the cooling chamber 5 has a scale channel 23, from the end of which a line 24 leads the secondary cooling water to a schematically illustrated water treatment system 25. From this water treatment plant, the secondary cooling water is fed to the feed lines 7 by means of a pump 26 via the line 27.

Die Blechwände 28 der Kühlkammer 5 sind innenseitig mit einer Isolier- und Dichtfolie 29 ausgekleidet. Die in Fig. 2 schematisch dargestellten Folienbefestigungen 30 sind an den Blechwänden 28 montiert. Die Kühlkammer 5 ist außenseitig von Stützträgern 31 umgeben.The sheet metal walls 28 of the cooling chamber 5 are lined on the inside with an insulating and sealing film 29. The film fastenings 30 shown schematically in FIG. 2 are mounted on the sheet metal walls 28. The cooling chamber 5 is surrounded on the outside by support beams 31.

Die Funktion der Einrichtung ist folgende: Das zur Kühlung des innerhalb der Kühlkammer 5 befindlichen Strangteiles, d. h. für die Sekundärkühlzone vorgesehene Kühlmittel wird über Leitungen 7 und Sprühdüsen 8 auf die Strangoberfläche aufgesprüht, wo es teilweise verdampft. Ein Teil des Kühlmittels wird über die Zuführungsleitungen 13, 14 als Durchflußmedium der Platte 9 und der Rohrschlange 12 zugeführt. Die Platte 9 und die Rohrschlange 12 können je nach Stellung der Dreiwegehähne entweder parallel oder in Serie geschaltet werden. Die Parallel-Schaltung ist in Fig. 3 mit voll ausgezogenen Pfeilen, die Serien-Schaltung mit strichliert gezeichneten Pfeilen versinnbildlicht.The function of the device is as follows: The for cooling the strand part located within the cooling chamber 5, i. H. Coolant provided for the secondary cooling zone is sprayed via lines 7 and spray nozzles 8 onto the strand surface, where it partially evaporates. A part of the coolant is supplied via the supply lines 13, 14 as the flow medium of the plate 9 and the coil 12. The plate 9 and the coil 12 can be connected either in parallel or in series, depending on the position of the three-way cocks. The parallel connection is symbolized in Fig. 3 with fully drawn arrows, the series connection with arrows drawn in dashed lines.

Der innerhalb der Kühlkammer 5 entstehende Kühlmitteldampf wird an der vom Durchflußmedium durchflossenen Rohrschlange 12 und an der ebenfalls vom Durchflußmedium durchflossenen Platte 9 kondensiert und tropft ab. Sind die Platte und die Rchrschlange in Serie geschaltet, ist eine möglichst hohe Temperatur des Durchflußmediums erreichbar, bei Parallel-Schaltung hingegen läßt sich eine größere Menge des Durchflußmediums mit gegenüber Serienschaltung niedrigerer Temperatur erzielen.The coolant vapor generated within the cooling chamber 5 is condensed on the pipe coil 12 through which the flow medium flows and on the plate 9 also through which the flow medium flows, and drips off. If the plate and the flow coil are connected in series, the highest possible temperature of the flow medium can be achieved, however, with a parallel connection, a larger amount of the flow medium can be achieved with a lower temperature than the series connection.

Die an das Durchflußmedium abgegebene Kondensationswärme wird in dem außerhalb der Kühlkammer angeordneten Wärmeumsetzer 21 an ein Heizmedium, beispielsweise Nutzwasser zur Gebäudeheizung etc., abgegeben. Anschließend gelangt das Durchflußmedium über die Rücklaufleitung 22 in die Kühlkammer 5; es könnte auch direkt der Wasseraufbereitungsanlage 25 zugeführt werden.The condensation heat given off to the flow medium is given off in the heat converter 21 arranged outside the cooling chamber to a heating medium, for example useful water for building heating etc. The flow medium then reaches the cooling chamber 5 via the return line 22; it could also be fed directly to the water treatment system 25.

Bei der in Fig. 3 dargestellten Ausführungsform wird das die Platte 9 bzw. die Rohrschlange 12 durchströmende Durchflußmedium in geschlossenem Kreislauf unabhängig von dem für die Sekundärkühlung verwendeten Kühlmittel geführt. Die aus dem Wärmeumsetzer 21 austretende Leitung 22' ist daher unter Zwischenschaltung einer Förderpumpe 32 an den die Zuleitungen 13, 14 verbindenden Dreiwegehahn 15 angeschlossen.In the embodiment shown in FIG. 3, the flow medium flowing through the plate 9 or the coil 12 is guided in a closed circuit independently of the coolant used for the secondary cooling. The line 22 'emerging from the heat converter 21 is therefore connected with the interposition of a feed pump 32 to the three-way valve 15 connecting the lines 13, 14.

Neben der Energierückgewinnung weist das erfindungsgemäße Verfahren noch weitere Vorteile auf, so z. B. erspart man sich die aufwendige Mechanik für eine Dampfabsaugung, woraus Kosten- und Energieeinsparungen resultieren. Auch sind keine Schächte für die Dampfabsaugung im Bereich der Stahlkonstruktion der Halle unterzubringen, wodurch der Hallenbau vereinfacht wird.In addition to energy recovery, the method according to the invention has other advantages, such as. B. saves the complex mechanics for steam extraction, resulting in cost and energy savings. There are also no shafts for steam extraction in the area of the steel structure of the hall, which simplifies hall construction.

Da aus der Stranggießanlage kein Dampf austritt, wird die durch die Anlage bewirkte Umweltbelastung gering gehalten.Since no steam emerges from the continuous casting plant, the environmental impact caused by the plant is kept low.

Das Sekundärkühlwasser kann im Kreislauf geführt werden; der Kühlmittelverlust ist äußerst gering bzw. kann überhaupt verhindert werden, so daß sich die Möglichkeit der Verwendung eines aufbereiteten (entkalkten) Kühlwassers anbietet. Nicht aufbereitetes Kühlwasser führt zu starken Kalkablagerungen in den Spritzdüsen sowie an den Anlagenbauteilen. Dieser Nachteil kann somit eliminiert werden. Ein weiterer Vorteil ist darin zu sehen, daß die Kühlkammer wesentlich einfacher ausgeführt werden kann, da innerhalb der Kühlkammer kein Unterdruck mehr vorhanden ist und die Dichtheit der Kühlkammer von einer Folie übernommen wird.The secondary cooling water can be circulated; The loss of coolant is extremely low or can be prevented at all, so that there is the possibility of using a treated (decalcified) cooling water. Untreated cooling water leads to heavy limescale deposits in the spray nozzles and on the system components. This disadvantage can thus be eliminated. Another advantage is the fact that the cooling chamber can be made much simpler, since there is no longer any negative pressure inside the cooling chamber and the tightness of the cooling chamber is taken over by a film.

Claims (10)

1. Method of recovering the heat of a cast strand (3) cast by the continuous casting method and which is guided through a cooling chamber (5) and brought into direct contact with a partially evaporating coolant, characterised in that the coolant vapour is brought into heat exchange with a closed surface condenser (9 to 12) arranged within the cooling chamber, and a flow-through medium of the surface condenser is brought into further heat exchange with a heat transformer (21) arranged outside of the cooling chamber.
2. Method according to claim 1, characterised in that the flow-through medium is guided in a closed circuit independently of the coolant.
3. Method according to claim 1, characterised in that the coolant is guided in a closed circuit, the condensate partially again being used to cool the strand surface and partially being used as a flow-through medium for the surface condenser, and that the flow-through medium leaving the heat exchanger also is partially used to cool the strand surface and partially as a flow-through medium for the condenser.
4. Arrangement for carrying out the method according to claims 1 to 3 in a continuous casting plant, in particular in a continuous casting plant for slabs, comprising a closed cooling chamber in which the secondary cooling zone for the cast strand is provided, including spraying nozzles for the coolant that are directed towards the cast strand, characterised in that within the cooling chamber (5) at least one surface condenser (9, 12) through which a flow-through medium flows is provided, which is connected with at least one heat transformer (21) arranged outside of the cooling chamber.
5. Arrangement according to claim 4, characterised in that the surface condenser (9, 12) is connected with the heat transformer (21) into a closed circuit.
6. Arrangement according to claim 4 or 5, characterised in that, within the cooling chamber, a plurality of surface condensers (9, 12) are connected in series.
7. Arrangement according to claim 4 or 5, characterised in that, within the cooling chamber, a plurality of surface condensers (9, 12) are connected in parallel.
8. Arrangement according to claims 4 to 7, characterised in that the surface condensers (9, 12) are arranged on the ceiling of the cooling chamber (5) and the side walls (28) of the cooling chamber are covered with an insulating and/or sealing foil (29).
9. Arrangement according to claims 4 to 7, characterised in that a surface condenser (9) is designed as a plate through which the flow-through medium flows, covering the cooling chamber (5) and provided with deflection rods (10) in its interior, and a further surface condenser (12) is designed as a tube coil located immediately below the plate (9).
10. Arrangement according to claims 4 to 8, characterised in that the surface condensers (9, 12), with the heat transformer (21), are connected in parallel to the coolant flow in the secondary cooling zone within the cooling chamber (5).
EP81890060A 1980-04-15 1981-04-07 Method of and arrangement for recovering the heat of a continuously cast strand Expired EP0038319B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2024/80 1980-04-15
AT0202480A AT365498B (en) 1980-04-15 1980-04-15 METHOD FOR RECOVERING FEATIBLE HEAT FROM A CONTINUOUS CAST STRING AND DEVICE FOR IMPLEMENTING THE METHOD

Publications (2)

Publication Number Publication Date
EP0038319A1 EP0038319A1 (en) 1981-10-21
EP0038319B1 true EP0038319B1 (en) 1983-07-27

Family

ID=3526157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81890060A Expired EP0038319B1 (en) 1980-04-15 1981-04-07 Method of and arrangement for recovering the heat of a continuously cast strand

Country Status (7)

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US (1) US4509582A (en)
EP (1) EP0038319B1 (en)
JP (1) JPS56160861A (en)
AT (1) AT365498B (en)
CA (1) CA1165972A (en)
DE (1) DE3160684D1 (en)
ES (1) ES501307A0 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202958A (en) * 1982-05-20 1983-11-26 Kawasaki Steel Corp Continuous casting method of steel
AT377461B (en) * 1983-07-26 1985-03-25 Voest Alpine Ag JET NOZZLE FOR COOLING IN CONTINUOUS CASTING PLANTS
US4610295A (en) * 1983-11-10 1986-09-09 Aluminum Company Of America Direct chill casting of aluminum-lithium alloys
GB8400426D0 (en) * 1984-01-09 1984-02-08 Alcan Int Ltd Casting metals
JPH0616938B2 (en) * 1986-04-25 1994-03-09 三菱アルミニウム株式会社 Reactive soldering method
FR2607739B1 (en) * 1986-12-03 1989-04-14 Cegedur PROCESS AND DEVICE FOR CASTING IN A PIT, WITHOUT RISK OF EXPLOSION, OF ALUMINUM AND ITS ALLOYS, IN PARTICULAR WITH LITHIUM
DE102009031557A1 (en) * 2009-03-02 2010-09-09 Sms Siemag Ag Energy recovery in hot strip mills by converting the cooling heat of the continuous casting plant and the residual heat of slabs and coils into electrical energy or other use of the captured process heat
EP1452252A1 (en) * 2003-02-28 2004-09-01 Hubert Dipl.-Ing. Sommerhofer Continuous casting method
NL2003671C2 (en) * 2009-10-19 2011-04-20 Level Holding Bv CLIMATE MANAGEMENT DEVICE FOR CASES.
EP4321274A1 (en) * 2022-07-27 2024-02-14 SMS Group GmbH Method and strand guiding device for operating a cooling chamber

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Publication number Priority date Publication date Assignee Title
LU32474A1 (en) * 1952-11-06
GB942248A (en) * 1962-09-25 1963-11-20 Olsson Erik Allan Improvements in or relating to the treatment of continuous castings
JPS5317965B2 (en) * 1972-11-30 1978-06-12
JPS51136512A (en) * 1975-05-22 1976-11-26 Kawasaki Heavy Ind Ltd Steel slab cooling facility
US4050884A (en) * 1976-03-04 1977-09-27 Richard Jablin Slag waste heat boiler
GB1505390A (en) * 1976-12-02 1978-03-30 Davy Loewy Ltd Cooling of metal bodies
SU673823A1 (en) * 1978-01-04 1979-07-15 Государственный Всесоюзный Институт По Проектированию Научно-Исследовательских Работ "Южгипроцемент" Screen bar refrigerator
AT363209B (en) * 1979-10-18 1981-07-27 Voest Alpine Ag METHOD FOR RECOVERING THE FEELABLE WARMTH OF SLAMS FOUND IN THE CONTINUOUS CASTING METHOD, AND SYSTEM FOR CARRYING OUT THIS PROCESS

Also Published As

Publication number Publication date
CA1165972A (en) 1984-04-24
ES8207329A1 (en) 1982-09-01
JPS56160861A (en) 1981-12-10
ES501307A0 (en) 1982-09-01
EP0038319A1 (en) 1981-10-21
ATA202480A (en) 1981-06-15
US4509582A (en) 1985-04-09
AT365498B (en) 1982-01-25
DE3160684D1 (en) 1983-09-01

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