EP0340207A1 - Blowing lance - Google Patents

Blowing lance Download PDF

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Publication number
EP0340207A1
EP0340207A1 EP89890114A EP89890114A EP0340207A1 EP 0340207 A1 EP0340207 A1 EP 0340207A1 EP 89890114 A EP89890114 A EP 89890114A EP 89890114 A EP89890114 A EP 89890114A EP 0340207 A1 EP0340207 A1 EP 0340207A1
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EP
European Patent Office
Prior art keywords
channel
lance
coolant
flow
end plate
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.)
Granted
Application number
EP89890114A
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German (de)
French (fr)
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EP0340207B1 (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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Publication of EP0340207A1 publication Critical patent/EP0340207A1/en
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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. 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 to the return channel.
  • blow lances of this type (DE-C - 27 12 745), which are suitable for various metallurgical processes, such as the LD, LDAC process, which has been tried and tested in practice, exposes the faceplate to considerable thermal loads resulting from the molten steel. If the end plate is not adequately cooled, premature wear and tear can result from the removal of material, which can lead to leakages on the end plate.
  • a flow guide between the inlet and the return channel is provided, which is designed so that a constant flow cross-section with increasing constriction between the adjacent expansion nozzles in the horizontal plane by proportional enlargement of the Flow cross section is given in the vertical plane. This is said to be a uniformly high Flow rate of the coolant can be ensured on the face plate.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to provide a blowing lance in which sufficient cooling of the central region of the end plate is ensured, so that the end plate no longer represents a weak point and the life of the blowing lance is significantly increased.
  • At least one secondary coolant channel is provided which, by branching off a partial flow of the coolant flowing into the connecting channel, leads this partial flow into a flow direction deviating from the direction of flow in the connecting channel and its mouth directly towards the center of the Faceplate is directed.
  • 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 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 internal 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 which is open on one side.
  • An embodiment in which a vortex formation on the end plate is avoided and nevertheless a high coolant flow speed is ensured on the entire end plate and in particular in the center thereof, is characterized in that, starting from the inlet channel, at least one bore through a bottom part of the bottom border of the at least one lance channel penetrates the side up to its center and merges into a bore penetrating the bottom part further vertically and these bores form the coolant secondary channel, advantageously to the vertical bore, a channel extension which is closed on all sides and extends to the center of the end plate is attached.
  • 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, 4 and 5 further embodiments are shown in a representation analogous to FIG. 1.
  • a blowing lance 1 for inflating oxygen onto 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 diverging 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 lying between the base part 8 and the end plate 11 is welded, which has a central passage 16 and 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 flow direction.
  • 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 tube piece like the variant shown in FIG. 1, has an internal cross section which decreases in size from its beginning to its end, ie in the direction of flow, as a result of which a partial flow which is particularly effective with regard to its flow velocity is directed against the center 26 of the end plate 11.
  • collecting plates 31 are inserted at the beginning of the connecting channel 19, to each of which a bore 32, which leads to the center of the base part 8, connects.
  • One or more collecting plates 31 arranged uniformly distributed can be provided.
  • the bores 32 leading into the center are followed by a further bore 34, which lies exactly in the axis 33 of the blowing lance, through which the partial flows of the coolant which are derived via the collecting plates are directed against the center 26 of the end plate 11.
  • This bore 34 is advantageously adjoined by a pipe section 35 arranged in the direction of the axis 33, as a result of which the branched-off coolant flow emerging from the latter can be guided close to the center 26 of the end plate 11 without being influenced by the flow in the connecting channel 19.

Abstract

Eine Blaslanze (1) zur Behandlung von metallurgischen Schmelzen weist einen Lanzenkopf (7) auf, in dem mehrere zu einer Badoberfläche der Schmelze gerichtete und eine Stirnplatte (11) des Lanzenkopfes (7) durchsetzende Expansionsdüsen (14) vorgesehen sind, die von mindestens einem Lanzenkanal (6) ausgehen, wobei der mindestens eine Lanzenkanal (6) von einem Zulauf- (17) und einem Rücklaufkanal (18) für ein Kühlmedium peripher umgeben ist und der Zulauf- (17) und Rücklaufkanal (18) voneinander von einem oberhalb der Stirnplatte (11) angeordneten Strömungslenkstück (15) getrennt sind, welches Strömungslenkstück (15) von mindestens einem den Zulauf(17) mit dem Rücklaufkanal (18) verbindenden Verbindungskanal (19) für das Kühlmedium durchsetzt ist. Um die Lebensdauer der Blaslanze (1) wesentlich zu erhöhen und um insbesondere eine Leckage der Stirnplatte (11) zu vermeiden, ist zusätzlich zu dem mindestens einen Verbindungskanal (19) mindestens ein Kühlmittelsekundärkanal (23) vorgesehen, der unter Abzweigung eines Teilstromes des dem Verbindungskanal (19) zulaufenden Kühlmittels diesen Teilstrom in eine von der Strömungsrichtung im Verbindungskanal (19) abweichende Strömungsrichtung ableitet und dessen Mündung (25) direkt gegen das Zentrum (26) der Stirnplatte (11) gerichtet ist.A blowing lance (1) for the treatment of metallurgical melts has a lance head (7), in which several expansion nozzles (14), which are directed towards a bath surface of the melt and penetrate an end plate (11) of the lance head (7), are provided, of which at least one Lance channel (6) extend, the at least one lance channel (6) being surrounded peripherally by an inlet (17) and a return channel (18) for a cooling medium and the inlet (17) and return channel (18) from one another above the The flow guide piece (15) arranged on the end plate (11) is separated, which flow guide piece (15) is penetrated by at least one connecting channel (19) for the cooling medium connecting the inlet (17) to the return channel (18). In order to significantly increase the service life of the blowing lance (1) and in particular to avoid leakage of the end plate (11), in addition to the at least one connecting channel (19) at least one coolant secondary channel (23) is provided, which branches off a partial flow of the connecting channel (19) incoming coolant derives this partial flow in a flow direction deviating from the flow direction in the connecting channel (19) and its mouth (25) is directed directly against the center (26) of the end plate (11).

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.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 to the return channel.

Bei Blaslanzen dieser Art (DE-C - 27 12 745), 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 blow lances of this type (DE-C - 27 12 745), which are suitable for various metallurgical processes, such as the LD, LDAC process, which has been tried and tested in practice, exposes the faceplate to considerable thermal loads resulting from the molten steel. If the end plate is not adequately cooled, premature wear and tear can result from the removal of material, which can lead to leakages on the end plate.

Man hat daher nach Lösungen gesucht, die Kühlung der thermisch hoch beanspruchten Stirnplatte zu verbessern. So ist beispielsweise gemäß der DE-C - 27 12 745 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.Solutions have therefore been sought to improve the cooling of the thermally highly stressed end plate. For example, according to DE-C - 27 12 745 to improve the cooling, a flow guide between the inlet and the return channel is provided, which is designed so that a constant flow cross-section with increasing constriction between the adjacent expansion nozzles in the horizontal plane by proportional enlargement of the Flow cross section is given in the vertical plane. This is said to be a uniformly high Flow rate of the coolant can be ensured on the face plate.

Eine problematische Stelle ist jedoch nach wie vor das Zentrum der Stirnplatte, bei welchem auch bei dieser bekannten Lösung nur eine relativ geringe Kühlmittelströmungsgeschwindigkeit herrscht. Es kann daher im Zentrum der Stirnplatte zu Dampfblasenbildungen kommen, wodurch wiederum Leckagen entstehen können.However, a problematic point is still the center of the end plate, in which there is only a relatively low coolant flow rate even with this known solution. Vapor bubbles can therefore form in the center of the end plate, 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 Stirnplatte sichergestellt ist, so daß die Stirnplatte keine Schwachstelle mehr darstellt und die Lebensdauer der Blaslanze wesentlich erhöht ist.The invention aims to avoid these disadvantages and difficulties and has as its object to provide a blowing lance in which sufficient cooling of the central region of the end plate is ensured, so that the end plate no longer represents a weak point and the life of the blowing lance is significantly increased.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zusätzlich zu dem mindestens einen Verbindungskanal mindestens ein Kühlmittelsekundärkanal vorgesehen ist, der unter Abzweigung eines Teilstromes des dem Verbindungskanal zulaufenden Kühlmittels diesen Teilstrom in eine von der Strömungsrichtung im Verbindungskanal abweichende Strömungsrichtung ableitet und dessen Mündung direkt gegen das Zentrum der Stirnplatte gerichtet ist.This object is achieved in that, in addition to the at least one connecting channel, at least one secondary coolant channel is provided which, by branching off a partial flow of the coolant flowing into the connecting channel, leads this partial flow into a flow direction deviating from the direction of flow in the connecting channel and its mouth directly towards the center of the Faceplate is directed.

Besonders günstige Strömungsverhältnisse stellen sich ein, wenn die Strömungsachse des Austrittsquerschnittes der Mündung des Kühlmittelsekundärkanales im Winkel zur Strömungsachse der im Verbindungskanal an der Mündung herrschenden Strömung des Kühlmittels steht.Particularly favorable flow conditions occur when 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.

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 intensive 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 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 internal 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 which is open on one side.

Eine Ausführungsform, bei der eine Wirbelbildung an der Stirnplatte vermieden wird und trotzdem eine hohe Kühlmittelströmungsgeschwindigkeit an der gesamten Stirnplatte und insbesondere in deren Zentrum sichergestellt ist, ist dadurch gekennzeichnet, daß vom Zulaufkanal ausgehend mindestens eine Bohrung durch einen den mindestens einen Lanzenkanal unten begrenzenden Bodenteil von der Seite her bis zu dessen Zentrum durchsetzt und in eine den Bodenteil weiter vertikal durchsetzende Bohrung übergeht und diese Bohrungen den Kühlmittelsekundärkanal bilden, wobei vorteilhaft an die vertikale Bohrung eine nahe bis zum Zentrum der Stirnplatte reichende allseits geschlossene Kanalverlängerung angesetzt ist.An embodiment in which a vortex formation on the end plate is avoided and nevertheless a high coolant flow speed is ensured on the entire end plate and in particular in the center thereof, is characterized in that, starting from the inlet channel, at least one bore through a bottom part of the bottom border of the at least one lance channel penetrates the side up to its center and merges into a bore penetrating the bottom part further vertically and these bores form the coolant secondary channel, advantageously to the vertical bore, a channel extension which is closed on all sides and extends to the center of the end plate is attached.

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, 4 und 5 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, 4 and 5, 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 onto 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 diverging 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 pipe 4, a flow guide piece 15 lying between the base part 8 and the end plate 11 is welded, which has a central passage 16 and 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 flow direction. 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 tube piece, like the variant shown in FIG. 1, has an internal cross section which decreases in size from its beginning to its end, ie in the direction of flow, as a result of which a partial flow which is particularly effective with regard to its flow velocity is directed against the center 26 of the end plate 11.

Gemäß der in Fig. 5 dargestellten Variante sind am Beginn des Verbindungskanales 19 Auffangbleche 31 eingesetzt, an die jeweils eine Bohrung 32, die zum Zentrum des Bodenteiles 8 leitet, anschließt. Es können ein oder mehrere gleichmäßig verteilt angeordnete Auffangbleche 31 vorgesehen sein. An die ins Zentrum führenden Bohrungen 32 schließt eine weitere, genau in der Achse 33 der Blaslanze liegende Bohrung 34 an, durch die die über die Auffangbleche abgeleiteten Teilströme des Kühlmittels gegen das Zentrum 26 der Stirnplatte 11 geleitet werden. An diese Bohrung 34 schließt zweckmäßig ein in Richtung der Achse 33 angeordnetes Rohrstück 35 an, wodurch der aus diesem austretende abgezweigte Kühlmittelstrom, ohne von der Strömung im Verbindungskanal 19 beeinflußt zu werden, bis nahe an das Zentrum 26 der Stirnplatte 11 geführt werden kann.According to the variant shown in FIG. 5, collecting plates 31 are inserted at the beginning of the connecting channel 19, to each of which a bore 32, which leads to the center of the base part 8, connects. One or more collecting plates 31 arranged uniformly distributed can be provided. The bores 32 leading into the center are followed by a further bore 34, which lies exactly in the axis 33 of the blowing lance, through which the partial flows of the coolant which are derived via the collecting plates are directed against the center 26 of the end plate 11. This bore 34 is advantageously adjoined by a pipe section 35 arranged in the direction of the axis 33, as a result of which the branched-off coolant flow emerging from the latter can be guided close to the center 26 of the end plate 11 without being influenced by the flow in the connecting channel 19.

Claims (8)

1. Blaslanze (1) zur Behandlung von metallurgischen Schmelzen, mit einem Lanzenkopf (7), in dem mehrere zu einer Badoberfläche der Schmelze gerichtete und eine Stirnplatte (11) des Lanzenkopfes (7) durchsetzende Expansionsdüsen (14) vorgesehen sind, die von mindestens einem Lanzenkanal (6) ausgehen, wobei der mindestens eine Lanzenkanal (6) von einem Zulauf- (17) und einem Rücklaufkanal (18) für ein Kühlmedium peripher umgeben ist und der Zulauf- (17) und Rücklaufkanal (18) voneinander von einem oberhalb der Stirnplatte (11) angeordneten Strömungslenkstück (15) getrennt sind, welches Strömungslenkstück (15) von mindestens einem den Zulauf- (17) mit dem Rücklaufkanal (18) verbindenden Verbindungskanal (19) für das Kühlmedium durchsetzt ist, dadurch gekennzeichnet, daß zusätzlich zu dem mindestens einen Verbindungskanal (19) mindestens ein Kühlmittelsekundärkanal (23) vorgesehen ist, der unter Abzweigung eines Teilstromes des dem Verbindungskanal (19) zulaufenden Kühlmittels diesen Teilstrom in eine von der Strömungsrichtung im Verbindungskanal (19) abweichende Strömungsrichtung ableitet und dessen Mündung (25) direkt gegen das Zentrum (26) der Stirnplatte (11) gerichtet ist.1. blowing lance (1) for the treatment of metallurgical melts, with a lance head (7), in which several directed towards a bath surface of the melt and an end plate (11) of the lance head (7) penetrating expansion nozzles (14) are provided, of at least a lance channel (6), the at least one lance channel (6) being surrounded peripherally by an inlet (17) and a return channel (18) for a cooling medium and the inlet (17) and return channels (18) from one another above The flow guide piece (15) arranged on the end plate (11) are separated, which flow guide piece (15) is penetrated by at least one connecting channel (19) for the cooling medium connecting the inlet (17) to the return channel (18), characterized in that in addition to the at least one connecting channel (19) is provided with at least one coolant secondary channel (23) which branches off a partial flow of the coolant flowing to the connecting channel (19) current in a flow direction deviating from the flow direction in the connecting channel (19) and the mouth (25) of which is directed directly against the center (26) of the end plate (11). 2. Blaslanze nach Anspruch 1, dadurch gekennzeichnet, daß die Strömungsachse (27) des Austrittsquerschnittes der Mündung (25) des Kühlmittelsekundärkanales (23) im Winkel zur Strömungsachse (28) der im Verbindungskanal (19) an der Mündung (25) herrschenden Strömung des Kühlmittels steht (Fig. 1 bis 4).2. Blow lance according to claim 1, characterized in that the flow axis (27) of the outlet cross section of the mouth (25) of the coolant secondary channel (23) at an angle to the flow axis (28) of the prevailing flow of the in the connecting channel (19) at the mouth (25) Coolant is (Fig. 1 to 4). 3. Blaslanze nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der bzw. die Kühlmittelsekundärkanal (23) bzw. -kanäle (23) radialasymmetrisch zum Zentrum (26) des Querschnittes des Lanzenkopfes (7) gerichtet ist (sind) (Fig. 1 bis 4).3. Blow lance according to claim 1 or 2, characterized in that the or the secondary coolant channel (23) or channels (23) is (are) directed radially asymmetrically to the center (26) of the cross section of the lance head (7) (FIGS. 1 to 4). 4. Blaslanze nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der mindestens eine Kühlmittelsekundärkanal (23) innerhalb des Verbindungskanales (19) angeordnet ist (Fig. 1 bis 4).4. Blow lance according to one or more of claims 1 to 3, characterized in that the at least one coolant secondary channel (23) is arranged within the connecting channel (19) (Fig. 1 to 4). 5. Blaslanze nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der mindestens eine Kühlmittelsekundärkanal (23) einen geschlossenen Querschnitt sowie einen sich von seinem Anfang bis zu seinem Ende verkleinernden Innenquerschnitt aufweist (Fig. 1, 4).5. Blow lance according to one or more of claims 1 to 4, characterized in that the at least one coolant secondary channel (23) has a closed cross-section and an internal cross-section which decreases from its beginning to its end (Fig. 1, 4). 6. Blaslanze nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der mindestens eine Kühlmittelsekundärkanal (23) einen nach einer Seite offenen Querschnitt aufweist (Fig. 3).6. Blow lance according to one or more of claims 1 to 4, characterized in that the at least one coolant secondary channel (23) has a cross section open to one side (Fig. 3). 7. Blaslanze nach Anspruch 1, dadurch gekennzeichnet, daß vom Zulaufkanal (17) ausgehend mindestens eine Bohrung (32) durch einen den mindestens einen Lanzenkanal (6) unten begrenzenden Bodenteil (8) von der Seite her bis zu dessen Zentrum durchsetzt und in eine den Bodenteil (8) weiter vertikal durchsetzende Bohrung (34) übergeht und diese Bohrungen (32, 34) den Kühlmittelsekundärkanal (23) bilden (Fig. 5).7. Blow lance according to claim 1, characterized in that starting from the inlet channel (17) at least one bore (32) through one of the at least one lance channel (6) delimiting bottom part (8) passes from the side to the center thereof and into one the bottom part (8) passes vertically through hole (34) and these holes (32, 34) form the coolant secondary channel (23) (Fig. 5). 8. Blaslanze nach Anspruch 7, dadurch gekennzeichnet, daß an die vertikale Bohrung (34) eine nahe bis zum Zentrum (26) der Stirnplatte (11) reichende allseits geschlossene Kanalverlängerung (35) angesetzt ist (Fig. 5).8. Blow lance according to claim 7, characterized in that the vertical bore (34) a close to the center (26) of the end plate (11) reaching all-round closed channel extension (35) is attached (Fig. 5).
EP89890114A 1988-04-25 1989-04-20 Blowing lance Expired - Lifetime EP0340207B1 (en)

Applications Claiming Priority (2)

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

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

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ID=3505366

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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)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996015278A1 (en) * 1994-11-15 1996-05-23 A.H. Tallman Bronze Company Limited Liquid cooled nozzle for a basic oxygen furnace lance
WO1997000973A1 (en) * 1995-06-23 1997-01-09 Jacques Thomas Nozzle with a welded lance head for melt agitation
WO1999046412A1 (en) * 1998-03-09 1999-09-16 Techint Compagnia Tecnica Internazionale S.P.A Blasting lance with a gas/liquid mixing chamber and a method for the expansion cooling thereof
WO2002022892A1 (en) * 2000-09-15 2002-03-21 Jacques Thomas Blowing lance nozzle
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
CN101993968A (en) * 2010-12-09 2011-03-30 中冶南方工程技术有限公司 Converter molten steel temperature control method
RU167353U1 (en) * 2016-05-23 2017-01-10 федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" MELT BLOWING Lance
BE1023685B1 (en) * 2016-05-25 2017-06-14 Soudobeam Sa NOSE OF BLOWING LANCE
WO2017178608A1 (en) 2016-04-15 2017-10-19 Soudobeam Sa Blowing lance nozzle
WO2017178611A1 (en) 2016-04-15 2017-10-19 Soudobeam Sa Blowing lance nozzle
WO2017178606A1 (en) 2016-04-15 2017-10-19 Soudobeam Sa Blowing lance nozzle

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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
AUPR624801A0 (en) * 2001-07-10 2001-08-02 Technological Resources Pty Limited A gas injection lance
EP2010851A4 (en) * 2006-04-21 2009-08-26 Berry Metal Co Metal making lance tip assembly
EP1908526A1 (en) * 2006-10-04 2008-04-09 Siemens S.A.S. Nozzle for a diphasic mixture
AU2007246207B2 (en) * 2006-12-15 2011-11-24 Technological 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
USD822987S1 (en) 2017-02-24 2018-07-17 Yeti Coolers, Llc Bag
CN115989325A (en) * 2020-09-08 2023-04-18 西门子股份公司 Laval nozzle and manufacturing method thereof

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US3743814A (en) * 1970-12-18 1973-07-03 G Oakes Oxygen lance
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996015278A1 (en) * 1994-11-15 1996-05-23 A.H. Tallman Bronze Company Limited Liquid cooled nozzle for a basic oxygen furnace lance
WO1997000973A1 (en) * 1995-06-23 1997-01-09 Jacques Thomas Nozzle with a welded lance head for melt agitation
EA000183B1 (en) * 1995-06-23 1998-12-24 Жак Тома Nozzle with a welded lance head for melt agitation by blowing
WO1999046412A1 (en) * 1998-03-09 1999-09-16 Techint Compagnia Tecnica Internazionale S.P.A Blasting lance with a gas/liquid mixing chamber and a method for the expansion cooling thereof
US6562287B1 (en) 1998-03-09 2003-05-13 Techint Compagnia Tecnica Internazionale S.P.A. Blasting lance with a gas/liquid mixing chamber and a method for the expansion cooling thereof
WO2002022892A1 (en) * 2000-09-15 2002-03-21 Jacques Thomas Blowing lance nozzle
BE1013686A3 (en) * 2000-09-15 2002-06-04 Thomas Jacques Blowing nose spear.
US6849228B2 (en) 2000-09-15 2005-02-01 Jacques Thomas Blowing lance nozzle
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
CN101993968A (en) * 2010-12-09 2011-03-30 中冶南方工程技术有限公司 Converter molten steel temperature control method
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
WO2017178608A1 (en) 2016-04-15 2017-10-19 Soudobeam Sa Blowing lance nozzle
WO2017178611A1 (en) 2016-04-15 2017-10-19 Soudobeam Sa Blowing lance nozzle
WO2017178606A1 (en) 2016-04-15 2017-10-19 Soudobeam Sa Blowing lance nozzle
RU167353U1 (en) * 2016-05-23 2017-01-10 федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский горный университет" MELT BLOWING Lance
BE1023685B1 (en) * 2016-05-25 2017-06-14 Soudobeam Sa NOSE OF BLOWING LANCE

Also Published As

Publication number Publication date
JPH01312023A (en) 1989-12-15
ATA104488A (en) 1989-06-15
AT389710B (en) 1990-01-25
KR970003638B1 (en) 1997-03-20
US4951928A (en) 1990-08-28
CN1012738B (en) 1991-06-05
RU1813101C (en) 1993-04-30
GR3005171T3 (en) 1993-05-24
ES2033142T3 (en) 1993-03-01
CA1306607C (en) 1992-08-25
KR890016188A (en) 1989-11-28
DE58901450D1 (en) 1992-06-25
CN1037545A (en) 1989-11-29
EP0340207B1 (en) 1992-05-20

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