EP0340207B1 - Blowing lance - Google Patents

Blowing lance Download PDF

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Publication number
EP0340207B1
EP0340207B1 EP89890114A EP89890114A EP0340207B1 EP 0340207 B1 EP0340207 B1 EP 0340207B1 EP 89890114 A EP89890114 A EP 89890114A EP 89890114 A EP89890114 A EP 89890114A EP 0340207 B1 EP0340207 B1 EP 0340207B1
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EP
European Patent Office
Prior art keywords
channel
coolant
flow
lance
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.)
Expired - Lifetime
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EP89890114A
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German (de)
French (fr)
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EP0340207A1 (en
Inventor
Manfred Eysn
Ernest Dr. Dipl.-Ing. Fuhrmann
Hans Dipl.-Ing. Grabner
Ernst Höllwarth
Hellmuth Smejkal
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Primetals Technologies Austria GmbH
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Voest Alpine Industrienlagenbau GmbH
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C2005/4626—Means for cooling, e.g. by gases, fluids or liquids

Definitions

  • the invention relates to a blowing lance for the treatment of metallurgical melts, with a lance head, in which a plurality of expansion nozzles are provided which are directed towards a bath surface of the melt and penetrate an end plate of the lance head and which emanate from at least one lance channel, the at least one lance channel from an inflow channel.
  • a return channel for a cooling medium is peripherally surrounded and the inlet and return channels are separated from one another by a flow guide piece arranged above the end plate, which flow guide piece is penetrated by at least one connecting channel for the cooling medium connecting the inlet channel and the return channel, and in addition to that at least one connecting channel, at least one coolant secondary channel is provided, which derives a partial flow of the coolant flowing into the connecting channel and this partial flow via an orifice directed directly against the center of the end plate to the connection channel.
  • a blowing lance of the type mentioned at the outset is known from SU-A-1002366.
  • the partial flow in this blowing lance has essentially the same flow direction as the coolant flow surrounding the partial flow peripherally.
  • a flow guide piece between the inlet and the return channel is provided to improve the cooling, which is designed so that a constant flow cross-section with increasing narrowing between the adjacent expansion nozzles in the horizontal plane by proportional increase in the flow cross-section in vertical plane is given. This is to ensure a uniformly high flow rate of the coolant on the end plate.
  • the invention aims to avoid these disadvantages and difficulties and has the task of creating a blowing lance, in which sufficient cooling of the central region of the forehead plate is ensured so that the forehead plate no longer represents a weak point and increases the life of the blowing lance significantly is.
  • blowing lance are the subject of dependent claims 2 to 5.
  • a particularly preferred embodiment is characterized in that the coolant secondary channel or channels is radially asymmetrical to the center of the Cross-section of the lance head is (are).
  • the asymmetrical supply of a partial coolant flow causes an even more intensive swirling of the flow prevailing on the end plate, so that areas with a significantly reduced coolant flow rate, as occur in known symmetrical flow conditions, are avoided.
  • An embodiment that is easy to manufacture is characterized in that the at least one coolant secondary channel is arranged within the connecting channel.
  • a particularly strong flow can be achieved in the central region of the end plate in that the at least one secondary coolant channel has a closed cross section and an inner cross section that decreases in size from its beginning to its end.
  • a structurally simple embodiment is characterized in that the at least one coolant secondary channel has a cross section open on one side.
  • FIG. 1 showing a longitudinal section through a blowing lance according to a first embodiment.
  • FIG. 2 is a section along the line II-II of FIG. 1.
  • FIGS. 3 and 4 further embodiments are shown in a representation analogous to FIG. 1.
  • a blowing lance 1 for inflating oxygen on a surface of e.g. melt located in a converter has a water-cooled outer jacket 2, which is formed by three concentrically arranged tubes 3, 4, 5.
  • a central lance channel 6 is formed through the inner tube 3, through which oxygen is supplied to the lance head 7.
  • the lance channel 6 is closed at its lower end by a base part 8. Gas passage openings 9, whose axes 10 are arranged to diverge from one another, lead through this base part 8 to the outside and, as will be explained below, are passed through the end plate 11 delimiting the lance head 7 on the melt side.
  • the end plate 11 is welded to the outer casing tube 5 and has inwardly directed pipe sockets 12 which connect to the gas passage openings 9 of the base part 8 in alignment.
  • a flow guide piece 15 is welded between the bottom part 8 and the end plate 11, which has a central passage 16 and with this together with the bottom part 8 and the end plate 11 one of the inlet 17 and the return channel 18, the formed by the tubes 3, 4 or by the tubes 4, 5, forms connecting connecting channel 19.
  • the cooling medium is fed through the inlet channel 17 to the connecting channel 19, in which it is deflected through the central passage 16 against the end plate 11. Then it flows along the end plate 11 radially outwards in the direction of the return channel 18.
  • the pipe sockets 12 of the end plate 11 project through the flow guide piece 15 with lateral play, so that cooling of these pipe sockets 12 is also ensured.
  • the central tube 3 is formed by two tube parts 3 'and 3', the lower, welded to the bottom part 8 tube part 3 'protrudes into the upwardly projecting tube part 3' and seals 22 are provided between these tube parts.
  • coolant secondary channels 23 are provided, each of which is formed by a tube 24 which is closed on all sides.
  • Each coolant secondary channel 23 starts from the inlet channel 17 and serves to branch off a partial flow of the incoming coolant.
  • Each partial flow is with the help of the coolant secondary channels 23 in one of the Direction of flow in the connecting channel 19 deviates from the direction of flow.
  • the mouth 25 of each coolant secondary channel 23 is directed directly against the center 26 of the end plate 11, which forms a protrusion in the interior of the blowing lance.
  • the flow axis 27 of the outlet cross section of the mouth 25 of each coolant secondary channel 23 is at an angle to the flow axis 28 of the flow prevailing in the connecting channel 19 at the mouth 25 of the coolant secondary channel 23.
  • the coolant secondary channels 23 have the effect that the radially symmetrical flow prevailing in the connecting channel 19 without coolant secondary channels 23 is swirled and a radially asymmetrical flow is created which ensures a coolant flow at a sufficiently high speed in the center of the end plate and the center 26 of the end plate 11 which is particularly endangered is sufficient cools.
  • a coolant secondary channel 23 is formed by a channel 29 which is U-shaped in cross section and extends in a straight line, the mouth of which is also directed against the center 26 of the end plate 11.
  • the embodiment shown in FIG. 4 has a coolant secondary channel 23 which, like the coolant secondary channel 23 shown in FIG. 1, is formed from a tube piece 30 which is closed on all sides.
  • This piece of pipe like the variant shown in Fig. 1, has a shape from its beginning to its end, i.e. in the direction of flow, reducing internal cross-section, whereby a flow which is particularly effective with regard to its flow velocity is directed against the center 26 of the end plate 11.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Nozzles (AREA)
  • Heat Treatment Of Articles (AREA)

Description

Die Erfindung betrifft eine Blaslanze zur Behandlung von metallurgischen Schmelzen, mit einem Lanzenkopf, in dem mehrere zu einer Badoberfläche der Schmelze gerichtete und eine Stirnplatte des Lanzenkopfes durchsetzende Expansionsdüsen vorgesehen sind, die von mindestens einem Lanzenkanal ausgehen, wobei der mindestens eine Lanzenkanal von einem Zulauf- und einem Rücklaufkanal für ein Kühlmedium peripher umgeben ist und der Zulauf- und Rücklaufkanal voneinander von einem oberhalb der Stirnplatte angeordneten Strömungslenkstück getrennt sind, welches Strömungslenkstück von mindestens einem den Zulauf- mit dem Rücklaufkanal verbindenden Verbindungskanal für das Kühlmedium durchsetzt ist, und wobei zusätzlich zu dem mindestens einen Verbindungskanal mindestens ein Kühlmittelsekundärkanal vorgesehen ist, der einen Teilstrom des dem Verbindungskanal zulaufenden Kühlmittels ableitet und diesen Teilstrom über eine direkt gegen das Zentrum der Stirnplatte gerichtete Mündung dem Verbindungskanal zuleitet.The invention relates to a blowing lance for the treatment of metallurgical melts, with a lance head, in which a plurality of expansion nozzles are provided which are directed towards a bath surface of the melt and penetrate an end plate of the lance head and which emanate from at least one lance channel, the at least one lance channel from an inflow channel. and a return channel for a cooling medium is peripherally surrounded and the inlet and return channels are separated from one another by a flow guide piece arranged above the end plate, which flow guide piece is penetrated by at least one connecting channel for the cooling medium connecting the inlet channel and the return channel, and in addition to that at least one connecting channel, at least one coolant secondary channel is provided, which derives a partial flow of the coolant flowing into the connecting channel and this partial flow via an orifice directed directly against the center of the end plate to the connection channel.

Aus der SU-A-1002366 ist eine Blaslanze der eingangs genannten Art bekannt. Der Teilstrom weist bei dieser Blaslanze im wesentlichen dieselbe Strömungsrichtung auf, wie die den Teilstrom peripher umgebende Kühlmittelströmung.A blowing lance of the type mentioned at the outset is known from SU-A-1002366. The partial flow in this blowing lance has essentially the same flow direction as the coolant flow surrounding the partial flow peripherally.

Bei wassergekühlten Blaslanzen mit mehreren Expansionsdüsen am Lanzenkopf, die sich für verschiedene metallurgische Verfahren, wie z.B. das LD-, LDAC-Verfahren, in der Praxis gut bewährt haben, ist die Stirnplatte erheblichen thermischen Belastungen, die von der Stahlschmelze herrühren, ausgesetzt. Es kann bei unzureichender Kühlung der Stirnplatte zu einem vorzeitigen Verschleiß durch Abtragen von Material kommen, wodurch Leckagen an der Stirnplatte entstehen können.In the case of water-cooled blowing lances with several expansion nozzles on the lance head, which have proven themselves in practice for various metallurgical processes, such as the LD, LDAC process, the end plate is exposed to considerable thermal loads resulting from the molten steel. If the faceplate is not adequately cooled, premature wear and tear can result from the removal of which can cause leaks on the faceplate.

Gemäß der DE-C - 27 12 745 ist zur Verbesserung der Kühlung ein Strömungslenkstück zwischen dem Zulauf- und dem Rücklaufkanal vorgesehen, das so ausgebildet ist, daß ein gleichbleibender Durchflußquerschnitt bei zunehmender Verengung zwischen den benachbarten Expansionsdüsen in horizontaler Ebene durch proportionale Vergrößerung des Durchflußquerschnittes in vertikaler Ebene gegeben ist. Hierdurch soll eine gleichmäßig hohe Strömungsgeschwindigkeit des Kühlmittels an der Stirnplatte sichergestellt werden.According to DE-C - 27 12 745, a flow guide piece between the inlet and the return channel is provided to improve the cooling, which is designed so that a constant flow cross-section with increasing narrowing between the adjacent expansion nozzles in the horizontal plane by proportional increase in the flow cross-section in vertical plane is given. This is to ensure a uniformly high flow rate of the coolant on the end plate.

Eine problematische Stelle bei dieser bekannten Blaslanze ist jedoch nach wie vor das Zentrum der Stirnplatte, bei welchem nur eine relativ geringe Kühlmittelströmungsgeschwindigkeit herrscht. Es kann daher im Zentrum der Stirn platte zu Dampfblasenbildungen kommen, wodurch wiederum Leckagen entstehen können.A problematic point with this known blowing lance is however still the center of the end plate, at which there is only a relatively low coolant flow rate. It can therefore occur in the center of the end plate to form steam bubbles, which in turn can cause leaks.

Die Erfindung bezweckt die Vermeidung dieser nachteile und Schwierigkeiten und stellt sich die Aufgabe, eine Blaslanze zu schaffen, bei der auch eine hinreichende Kühlung des Zentralbereiches der Stirn platte sichergestellt ist, so daß die Stirn platte keine Schwachstelle mehr darstellt und die Lebensdauer der Blaslanze wesentlich erhöht ist.The invention aims to avoid these disadvantages and difficulties and has the task of creating a blowing lance, in which sufficient cooling of the central region of the forehead plate is ensured so that the forehead plate no longer represents a weak point and increases the life of the blowing lance significantly is.

Diese Aufgabe wird erfindungsgemäß entsprechend Anspruch 1 dadurch gelöst, daß die Strömungsachse des Austrittsquerschnittes der Mündung des Kühlmittelsekundärkanales im Winkel zur Strömungsachse der im Verbindungskanal an der Mündung herrschenden Strömung des Kühlmittels steht, wodurch sich besonders günstige Strömungsverhältnisse einstellen.This object is achieved according to the invention in that the flow axis of the outlet cross section of the mouth of the coolant secondary channel is at an angle to the flow axis of the coolant flow prevailing in the connecting channel at the mouth, which results in particularly favorable flow conditions.

Bevorzugte Ausfuhrungsformen der Blaslanze sind gegenstand der abhängigen Ansprüche 2 bis 5.Preferred embodiments of the blowing lance are the subject of dependent claims 2 to 5.

Eine besonders bevorzugte Ausführungsform ist dadurch gekennzeichnet, daß der bzw. die Kühlmittelsekundärkanal bzw. -kanäle radialasymmetrisch zum Zentrum des Querschnittes des Lanzenkopfes gerichtet ist (sind).A particularly preferred embodiment is characterized in that the coolant secondary channel or channels is radially asymmetrical to the center of the Cross-section of the lance head is (are).

Die asymmetrische Zuleitung eines Kühlmittelteilstromes bewirkt eine noch intensivere Verwirbelung der an der Stirnplatte herrschenden Strömung, so daß Bereiche mit wesentlich reduzierter Kühlmittelströmungsgeschwindigkeit, wie sie sich bei bekannten symmetrischen Strömungsverhältnissen einstellen, vermieden werden.The asymmetrical supply of a partial coolant flow causes an even more intensive swirling of the flow prevailing on the end plate, so that areas with a significantly reduced coolant flow rate, as occur in known symmetrical flow conditions, are avoided.

Eine leicht herzustellende Ausführungsform ist dadurch gekennzeichnet, daß der mindestens eine Kühlmittelsekundärkanal innerhalb des Verbindungskanales angeordnet ist.An embodiment that is easy to manufacture is characterized in that the at least one coolant secondary channel is arranged within the connecting channel.

Eine besonders starke Strömung läßt sich im Zentralbereich der Stirnplatte dadurch erzielen, daß der mindestens eine Kühlmittelsekundärkanal einen geschlossenen Querschnitt sowie einen sich von seinem Anfang bis zu seinem Ende verkleinernden Innenquerschnitt aufweist.A particularly strong flow can be achieved in the central region of the end plate in that the at least one secondary coolant channel has a closed cross section and an inner cross section that decreases in size from its beginning to its end.

Eine konstruktiv einfache Ausführungsform ist dadurch gekennzeichnet, daß der mindestens eine Kühlmittelsekundärkanal einen nach einer Seite offenen Querschnitt aufweist.A structurally simple embodiment is characterized in that the at least one coolant secondary channel has a cross section open on one side.

Die Erfindung ist nachfolgend anhand der Zeichnung an mehreren Ausführungsbeispielen näher erläutert, wobei Fig. 1 einen Längsschnitt durch eine Blaslanze nach einer ersten Ausführungsform zeigt. Fig. 2 ist ein Schnitt gemäß der Linie II-II der Fig. 1. In den Fig. 3 und 4 sind weitere Ausführungsformen in zu Fig. 1 analoger Darstellung gezeigt.The invention is explained in more detail below with reference to the drawing using several exemplary embodiments, FIG. 1 showing a longitudinal section through a blowing lance according to a first embodiment. FIG. 2 is a section along the line II-II of FIG. 1. In FIGS. 3 and 4, further embodiments are shown in a representation analogous to FIG. 1.

Eine Blaslanze 1 zum Sauerstoffaufblasen auf eine Oberfläche einer z.B. in einem Konverter befindlichen Schmelze weist einen wassergekühlten Außenmantel 2 auf, der von drei konzentrisch angeordneten Rohren 3, 4, 5 gebildet ist. Durch das Innenrohr 3 wird ein zentraler Lanzenkanal 6 gebildet, durch den Sauerstoff zum Lanzenkopf 7 zugeführt wird. Der Lanzenkanal 6 ist an seinem unteren Ende durch einen Bodenteil 8 verschlossen. Durch diesen Bodenteil 8 führen Gasdurchtrittsöffnungen 9, deren Achsen 10 zueinander divergierend angeordnet sind, nach außen und sind, wie nachfolgend noch erläutert, durch die den Lanzenkopf 7 schmelzenseitig begrenzende Stirnplatte 11 hindurchgeführt.A blowing lance 1 for inflating oxygen on a surface of e.g. melt located in a converter has a water-cooled outer jacket 2, which is formed by three concentrically arranged tubes 3, 4, 5. A central lance channel 6 is formed through the inner tube 3, through which oxygen is supplied to the lance head 7. The lance channel 6 is closed at its lower end by a base part 8. Gas passage openings 9, whose axes 10 are arranged to diverge from one another, lead through this base part 8 to the outside and, as will be explained below, are passed through the end plate 11 delimiting the lance head 7 on the melt side.

Die Stirnplatte 11 ist am Außenmantelrohr 5 angeschweißt und weist nach innen gerichtete Rohrstutzen 12 auf, die an die Gasdurchtrittsöffnungen 9 des Bodenteiles 8 fluchtend anschließen. Die Gasdurchtrittsöffnungen 9 bilden zusammen mit dem sich nach außen im Querschnitt erweiternden Innenraum 13 der Rohrstutzen 12 die Expansionsdüsen 14.The end plate 11 is welded to the outer casing tube 5 and has inwardly directed pipe sockets 12 which connect to the gas passage openings 9 of the base part 8 in alignment. The gas passage openings 9, together with the interior 13 of the pipe socket 12, which widens outwards in cross section, form the expansion nozzles 14.

Wie aus Fig. 2 ersichtlich ist, sind vier solche Expansionsdüsen 14 vorgesehen. Ihre Anordnung ist radial symmetrisch getroffen.As can be seen from FIG. 2, four such expansion nozzles 14 are provided. Their arrangement is made radially symmetrical.

An das mittlere Rohr 4 ist endseitig ein zwischen dem Bodenteil 8 und der Stirnplatte 11 liegendes Strömungslenkstück 15 angeschweißt, welches einen zentralen Durchlaß 16 aufweist und mit diesem gemeinsam mit dem Bodenteil 8 und der Stirnplatte 11 einen den Zulauf- 17 und den Rücklaufkanal 18, die von den Rohren 3, 4 bzw. von den Rohren 4, 5 gebildet werden, verbindenden Verbindungskanal 19 bildet. Das Kühlmedium wird durch den Zulaufkanal 17 dem Verbindungskanal 19 zugeführt, in diesem unter Durchtritt durch den zentralen Durchlaß 16 gegen die Stirnplatte 11 umgelenkt. Danach strömt es entlang der Stirnplatte 11 radial nach außen in Richtung zum Rücklaufkanal 18. Die Rohrstutzen 12 der Stirnplatte 11 ragen mit seitlichem Spiel durch das Strömungslenkstück 15, so daß auch eine Kühlung dieser Rohrstutzen 12 sichergestellt ist.At the end of the middle tube 4 a flow guide piece 15 is welded between the bottom part 8 and the end plate 11, which has a central passage 16 and with this together with the bottom part 8 and the end plate 11 one of the inlet 17 and the return channel 18, the formed by the tubes 3, 4 or by the tubes 4, 5, forms connecting connecting channel 19. The cooling medium is fed through the inlet channel 17 to the connecting channel 19, in which it is deflected through the central passage 16 against the end plate 11. Then it flows along the end plate 11 radially outwards in the direction of the return channel 18. The pipe sockets 12 of the end plate 11 project through the flow guide piece 15 with lateral play, so that cooling of these pipe sockets 12 is also ensured.

Zwischen den Rohren 3, 4, 5 sind jeweils Distanzstücke 20, 21 eingesetzt, um die gegenseitige Lage der Rohre und damit den Strömungsquerschnitt des Zulauf- 17 und Rücklaufkanales 18 sicherzustellen. Zum Ausgleich von Längsdehnungen ist das zentrale Rohr 3 von zwei Rohrteilen 3′ und 3˝ gebildet, wobei der untere, an den Bodenteil 8 angeschweißte Rohrteil 3˝ in den nach oben ragenden Rohrteil 3′ hineinragt und zwischen diesen Rohrteilen Dichtungen 22 vorgesehen sind.Spacers 20, 21 are inserted between the tubes 3, 4, 5 in order to ensure the mutual position of the tubes and thus the flow cross section of the inlet 17 and return channels 18. To compensate for longitudinal expansion, the central tube 3 is formed by two tube parts 3 'and 3', the lower, welded to the bottom part 8 tube part 3 'protrudes into the upwardly projecting tube part 3' and seals 22 are provided between these tube parts.

Gemäß der in Fig. 1 dargestellten Ausführungsform sind zwei radial asymmetrisch angeordnete, d.h. in nur einer Hälfte des Querschnittes liegende (vgl. Fig. 2) Kühlmittelsekundärkanäle 23 vorgesehen, die jeweils von einem allseits geschlossenen Rohr 24 gebildet sind. Jeder Kühlmittelsekundärkanal 23 geht vom Zulaufkanal 17 aus und dient zur Abzweigung eines Teilstromes des zulaufenden Kühlmittels. Jeder Teilstrom wird mit Hilfe der Kühlmittelsekundärkanäle 23 in eine von der Strömungsrichtung im Verbindungskanal 19 abweichende Strömungsrichtung geleitet. Die Mündung 25 jedes Kühlmittelsekundärkanales 23 ist direkt gegen das eine im Blaslanzeninnere ragende Erhebung bildende Zentrum 26 der Stirnplatte 11 gerichtet.According to the embodiment shown in FIG. 1, two radially asymmetrically arranged, ie lying in only one half of the cross section (see FIG. 2) coolant secondary channels 23 are provided, each of which is formed by a tube 24 which is closed on all sides. Each coolant secondary channel 23 starts from the inlet channel 17 and serves to branch off a partial flow of the incoming coolant. Each partial flow is with the help of the coolant secondary channels 23 in one of the Direction of flow in the connecting channel 19 deviates from the direction of flow. The mouth 25 of each coolant secondary channel 23 is directed directly against the center 26 of the end plate 11, which forms a protrusion in the interior of the blowing lance.

Die Strömungsachse 27 des Austrittsquerschnittes der Mündung 25 jedes Kühlmittelsekundärkanales 23 steht im Winkel zur Strömungsachse 28 der im Verbindungskanal 19 an der Mündung 25 des Kühlmittelsekundärkanales 23 herrschenden Strömung. Die Kühlmittelsekundärkanäle 23 bewirken, daß die im Verbindungskanal 19 ohne Kühlmittelsekundärkanäle 23 herrschende radial symmetrische Strömung verwirbelt wird und eine radial asymmetrische Strömung entsteht, die im Zentrum der Stirnplatte eine Kühlmittelströmung mit hinreichend großer Geschwindigkeit sicherstellt und das im besonderen Maß gefährdete Zentrum 26 der Stirnplatte 11 ausreichend kühlt.The flow axis 27 of the outlet cross section of the mouth 25 of each coolant secondary channel 23 is at an angle to the flow axis 28 of the flow prevailing in the connecting channel 19 at the mouth 25 of the coolant secondary channel 23. The coolant secondary channels 23 have the effect that the radially symmetrical flow prevailing in the connecting channel 19 without coolant secondary channels 23 is swirled and a radially asymmetrical flow is created which ensures a coolant flow at a sufficiently high speed in the center of the end plate and the center 26 of the end plate 11 which is particularly endangered is sufficient cools.

Gemäß der in Fig. 3 dargestellten Ausführungsform ist ein Kühlmittelsekundärkanal 23 von einer im Querschnitt U-förmigen, geradlinig verlaufenden Rinne 29 gebildet, deren Mündung ebenfalls gegen das Zentrum 26 der Stirnplatte 11 gerichtet ist.According to the embodiment shown in FIG. 3, a coolant secondary channel 23 is formed by a channel 29 which is U-shaped in cross section and extends in a straight line, the mouth of which is also directed against the center 26 of the end plate 11.

Die in Fig. 4 dargestellte Ausführungsform weist einen Kühlmittelsekundärkanal 23 auf, der ähnlich wie der in Fig. 1 dargestellte Kühlmittelsekundärkanal 23 aus einem allseits geschlossenen Rohrstück 30 gebildet ist. Dieses Rohrstück weist ebenso wie die in Fig. 1 dargestellte Variante einen sich von seinem Anfang bis zu seinem Ende, d.h. in Strömungsrichtung, verkleinernden Innenquerschnitt auf, wodurch ein hinsichtlich seiner Strömungsgeschwindigkeit besonders effektiver Teilstrom gegen das Zentrum 26 der Stirnplatte 11 gerichtet wird.The embodiment shown in FIG. 4 has a coolant secondary channel 23 which, like the coolant secondary channel 23 shown in FIG. 1, is formed from a tube piece 30 which is closed on all sides. This piece of pipe, like the variant shown in Fig. 1, has a shape from its beginning to its end, i.e. in the direction of flow, reducing internal cross-section, whereby a flow which is particularly effective with regard to its flow velocity is directed against the center 26 of the end plate 11.

Claims (5)

1. Blowing lance (1) for treating metallurgical melts, having a lance head (7), in which a plurality of expansion tuyeres (14) directed toward a bath surface of the melt and penetrating a front plate (11) of the lance head (7) is provided, which expansion tuyeres depart from at least one lance channel (6), the at least one lance channel (6) being peripherally surrounded by a supply channel (17) and a return channel (18) for a coolant and the supply channel (17) and the return channel (18) being separated from each other by a flow deflection piece (15) arranged above the front plate (11), which flow deflection piece (15) is penetrated by at least one connecting channel (19) for the coolant connecting the supply channel (17) with the return channel (18), and wherein, in addition to the at least one connecting channel (19), at least one coolant secondary channel (23) is provided, which diverts a partial stream of the coolant flowing to the connecting channel (19) and supplies said partial stream to the connecting channel (19) via a mouth (25) directed directly toward the centre (26) of the front plate (11), under the proviso that the flow axis (27) of the outlet cross section of the mouth (25) of the coolant secondary channel (23) is disposed at an angle to the flow axis (28) of the coolant flow prevailing in said connecting channel (19) at the mouth (25) (Figs. 1 to 4).
2. Blowing lance according to claim 1, characterised in that the coolant secondary channel(s) (23) is (are) directed in a radially asymmetrical manner to the centre (26) of the cross section of the lance head (7) (Figs. 1 to 4).
3. Blowing lance according to claim 1 or 2, characterised in that the at least one coolant secondary channel (23) is arranged within the connecting channel (19) (Figs. 1 to 4).
4. Blowing lance according to one or more of claims 1 to 3, characterised in that the at least one coolant secondary channel (23) has a closed cross section as well as an internal cross section decreasing from its beginning to its end (Figs. 1, 4).
5. Blowing lance according to one or more of claims 1 to 4, characterised in that the at least one coolant secondary channel (23) has a cross section open toward one side (Fig. 3).
EP89890114A 1988-04-25 1989-04-20 Blowing lance Expired - Lifetime EP0340207B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0104488A AT389710B (en) 1988-04-25 1988-04-25 BLOWING
AT1044/88 1988-04-25

Publications (2)

Publication Number Publication Date
EP0340207A1 EP0340207A1 (en) 1989-11-02
EP0340207B1 true EP0340207B1 (en) 1992-05-20

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EP89890114A Expired - Lifetime EP0340207B1 (en) 1988-04-25 1989-04-20 Blowing lance

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US (1) US4951928A (en)
EP (1) EP0340207B1 (en)
JP (1) JPH01312023A (en)
KR (1) KR970003638B1 (en)
CN (1) CN1012738B (en)
AT (1) AT389710B (en)
CA (1) CA1306607C (en)
DE (1) DE58901450D1 (en)
ES (1) ES2033142T3 (en)
GR (1) GR3005171T3 (en)
RU (1) RU1813101C (en)

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WO1996015278A1 (en) * 1994-11-15 1996-05-23 A.H. Tallman Bronze Company Limited Liquid cooled nozzle for a basic oxygen furnace lance
BE1009743A3 (en) * 1995-06-23 1997-07-01 Thomas Jacques Tuyere blowing oxygen steel.
EP0947587A1 (en) 1998-03-09 1999-10-06 Volkwin Köster Blow lance and process for its cooling
US6217824B1 (en) 1999-05-20 2001-04-17 Berry Metal Company Combined forged and cast lance tip assembly
AUPQ535500A0 (en) * 2000-01-31 2000-02-17 Technological Resources Pty Limited Apparatus for injecting gas into a vessel
BE1013686A3 (en) * 2000-09-15 2002-06-04 Thomas Jacques Blowing nose spear.
AUPR624801A0 (en) 2001-07-10 2001-08-02 Technological Resources Pty Limited A gas injection lance
DE102006010287A1 (en) * 2006-03-02 2007-09-13 Saar-Metallwerke Gmbh Oxygen lance head for steel production, comprises an oxygen collecting chamber, circularly blowing nozzles arranged near to the chamber, a cool water guidance channel connected to the blowing nozzles, and a cool water supplying channel
WO2007123986A2 (en) * 2006-04-21 2007-11-01 Berry Metal Company Metal making lance tip assembly
EP1908526A1 (en) * 2006-10-04 2008-04-09 Siemens S.A.S. Nozzle for a diphasic mixture
US7568681B2 (en) * 2006-12-15 2009-08-04 Technology Resources Pty. Limited Apparatus for injecting gas into a vessel
KR101159663B1 (en) * 2010-03-30 2012-06-25 현대제철 주식회사 Nozzle device for electric furnace
CN101993968B (en) * 2010-12-09 2012-07-18 中冶南方工程技术有限公司 Converter molten steel temperature control method
BE1023582B1 (en) 2016-04-15 2017-05-09 Soudobeam Sa NOSE OF BLOWING LANCE
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BE1023609B1 (en) 2016-04-15 2017-05-16 Soudobeam Sa Blowing spear nose
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USD822987S1 (en) 2017-02-24 2018-07-17 Yeti Coolers, Llc Bag
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Also Published As

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RU1813101C (en) 1993-04-30
US4951928A (en) 1990-08-28
KR890016188A (en) 1989-11-28
DE58901450D1 (en) 1992-06-25
ES2033142T3 (en) 1993-03-01
CA1306607C (en) 1992-08-25
KR970003638B1 (en) 1997-03-20
CN1012738B (en) 1991-06-05
EP0340207A1 (en) 1989-11-02
GR3005171T3 (en) 1993-05-24
JPH01312023A (en) 1989-12-15
ATA104488A (en) 1989-06-15
AT389710B (en) 1990-01-25
CN1037545A (en) 1989-11-29

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