EP0340711B1 - Process and installation for adding alloying products to a molten metal stream - Google Patents

Process and installation for adding alloying products to a molten metal stream Download PDF

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Publication number
EP0340711B1
EP0340711B1 EP89107892A EP89107892A EP0340711B1 EP 0340711 B1 EP0340711 B1 EP 0340711B1 EP 89107892 A EP89107892 A EP 89107892A EP 89107892 A EP89107892 A EP 89107892A EP 0340711 B1 EP0340711 B1 EP 0340711B1
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EP
European Patent Office
Prior art keywords
converter
jet
alloying
molten metal
casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89107892A
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German (de)
French (fr)
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EP0340711A2 (en
EP0340711A3 (en
Inventor
Wolfram Dr. Ing. Florin
Horst Dipl.-Ing. Kalthoff
Dieter Dr. Ing. Pflipsen
Rolf Dipl.-Ing. Höffken
Klaus Jürgen Müller
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Thyssen Stahl AG
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Thyssen Stahl AG
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Priority to AT89107892T priority Critical patent/ATE92112T1/en
Publication of EP0340711A2 publication Critical patent/EP0340711A2/en
Publication of EP0340711A3 publication Critical patent/EP0340711A3/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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • C21C7/0043—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material into the falling stream of molten metal
    • 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
    • C21C5/4653—Tapholes; Opening or plugging thereof

Definitions

  • the invention relates to a method and an associated device for adding alloying agents into a molten metal, in particular molten steel when tapping a converter into a ladle, in which the alloying agents are brought together in the form of a jet with the pouring pouring stream of the melt by the alloying agent jet using an am Vessel jacket of the converter arranged addition device is guided so that the two jets meet, the alloying agent jet forms an angle with the vertical plane formed by the pouring jet.
  • the associated device consists of an addition tube for the alloying means arranged on the vessel jacket of the converter, the outlet opening thereof arranged in the region of the tap opening of the converter pointing in the direction of the pouring jet, and means for supplying alloying means to the addition tube.
  • a device for adding alloy materials in which a chute directed towards the pouring jet is provided for conveying the alloy materials.
  • the chute can be extended from a rest position into a working position under a cover, it being possible to adjust the chute between the starting position B and the end position C.
  • a disadvantage is the fact that the alloys have different speeds due to different lengths of fall in the chute and different inclinations of the chute in the different positions. These different speeds make it difficult for the operator to merge the alloying agent flow with the flowing metal melt stream in any position. Further disadvantages consist in the fact that the known device requires more space and that subsequent installation may not be possible due to the local conditions in a steel mill. Because of the longer transport routes for the alloying agents, there is an increase in the transport time and thus a higher energy expenditure for operating the device and higher maintenance and repair costs. In addition, the device requires a higher investment.
  • the present invention has set itself the task To avoid disadvantages of the known devices and to propose a method and a device which allow the alloying agent jet to hit the molten metal casting jet with great certainty and in this way a more intensive dissolution and distribution of the alloying agents in the weld pool can be set.
  • the invention solves this problem procedurally with the features specified in claim 1 and device-wise with the features of claim 3.
  • the alloying agent jet can be continuously readjusted until it meets the molten metal casting jet. In this way it is ensured that if the two beams, e.g. if the position of the molten metal casting jet changes due to the changing inclination of the converter when the molten metal is poured out of the converter, the jets are brought together again.
  • the two jets can also not coincide if the position of the molten metal casting jet changes due to changing position and size of the tap opening of the converter due to wear or if the position of the alloying agent jet changes due to a different composition of the alloying agent, among other things. due to different grain sizes, friction values and specific weights of the alloying agents.
  • the addition tube is arranged pivotably on the vessel jacket of the converter, preferably on a support ring.
  • a housing designed as a funnel is provided on the support ring, for receiving the alloying means brought in with a conveying trough and for passing it on to the subsequent addition pipe. If a support ring is not or not available at the corresponding point on the converter, a bracket can be attached to the converter jacket.
  • Preferred embodiments of the invention are the subject of subclaim 2 regarding the method and the subject of subclaims 5 to 10 regarding the device.
  • the method according to the invention and the device according to the invention consist in the fact that a subsequent installation of the device is easily possible and only low investment costs have to be used for this. Furthermore, the device is characterized by short transport routes and high operational reliability; the energy expenditure for operating the system and the maintenance and repair costs are low.
  • FIGS. 1 to 4 show a converter 1 for the production of steel, the converter being shown in the working position in FIGS. 1 and 4 and the casting position in FIGS. 2 and 3.
  • a funnel-shaped Housing 4 On a support ring 2 above the support pin 1a in the area of the converter hat 3 is a funnel-shaped Housing 4 arranged for receiving the alloying agent.
  • the housing 4 has a side loading opening 5 and a lower outlet opening 6. At this outlet opening 6 there is an addition pipe 7 with its inlet opening 8.
  • the outlet opening 9 of the addition pipe 7 points in the direction of the steel pouring jet 11, which emerges from the tap opening 10 in the casting position of the converter 1; As FIGS. 2 and 3 show, the alloy medium jet 12 hits the steel pouring jet 11 before it enters the ladle 13.
  • the addition tube 7 is pivotally fastened in the region of its inlet opening 8 via a joint device on the support ring 2.
  • an electro-mechanical, water-cooled adjusting device 14 is arranged on the support ring 2. As shown in detail in FIG. 5, the adjusting device 14 is articulated via a fastening piece 17 to a fastening support 18 which is fastened on the support ring 2.
  • a scissor jack 19 is arranged on the lifting rod 16, the upper arm 21 of which is articulated via a bearing plate 22 to the tip of the addition tube 7 and the lower arm 20 of which is connected to the supporting ring 2 via a further bearing plate 23.
  • Figure 6 shows that by extending the lifting rod 16, the arms 20 and 21 of the scissor lift 19 are spread, so that the addition tube 7 can be continuously adjusted in this way.
  • a U-shaped pipe guide 31 prevents the addition tube 7 from tilting when the converter 1 is pivoted.
  • FIG. 7 shows the design of the articulation device in the area of the inlet opening 8 of the addition tube 7. It consists of a bracket 32 which is fastened on the support ring 2 and an associated holder 33 on the addition tube 7.
  • the bracket 32 and the holder 33 are connected via a Threaded bolt 34 with lock nuts 37, which is arranged in bores of the two parts, not shown, connected to one another.
  • Crowned disks 35 arranged on the threaded bolt 34 and a plate spring assembly 36 ensure the resiliently articulated design of the joint device.
  • the power supply and control cables and the cooling water lines for the adjusting device 14 run in a manner not shown Way in the support ring 2 and through one of the support pins 1a of the converter 1 to the supply sources or to a converter tapping stand 24 on the work platform 25.
  • a vibrating conveyor trough 26 for conveying the alloying agents into the funnel-shaped housing 4 is arranged on the working platform 25; the vibrating conveyor trough 26 can be moved on rails 27.
  • a pneumatically acting piston-cylinder unit 28 serves to move the feed trough 26 back and forth; the cylinder of the assembly 28 is connected to the chassis of the conveyor trough 26 and the piston rod 29 to an external fixed bearing.
  • the electro-mechanical adjusting device 14 is actuated by an operator from the tapping stand 24. Furthermore, a converter position detection known per se is arranged in the tapping stand 24, with which, according to the converter position and the casting time, the vibrating conveyor trough 26 is activated via a drive 26a and the pneumatic piston-cylinder unit 28 for moving the conveyor trough back and forth 26 is controlled.
  • the device according to the invention for introducing alloy substances is operated as follows: After the blowing process, the converter 1 is rotated from the working position according to FIGS. 1 and 4 into the casting position, as shown in FIGS. 2 and 3.
  • the vibrating conveyor trough 26 is advanced so far in accordance with the converter position detection that the front section of the conveyor trough 26 projects into the lateral loading opening 5 of the funnel-shaped housing 4. From bunkers (not shown), the alloying agents now enter the housing 4 via the vibrating conveyor trough 26 that has been put into operation, and through the subsequent addition pipe 7 into the steel pouring jet 11.
  • the falling height of the molten steel in converter 1 is compensated for by further pivoting of the converter; however, this changes the position of the steel pouring jet 11. So that the alloys continue to hit the pouring jet 11, the operator actuates the adjusting device 14 from the tapping stand 24, as a result of which the addition tube 7 is correspondingly continuously adjusted. This ensures that the exiting Alloy medium jet 12 hits the steel pouring jet 11.
  • the adjustment of the addition tube 7 by actuating the adjusting device 14 is also carried out if the position of the steel pouring jet 11 changes with increasing age of the tap opening 10 or if the position of the alloying agent jet 12 changes as a result of the changing composition of the alloying agent.
  • the vibrating conveyor trough 26 is controlled via the converter position detection in such a way that the conveyor trough 26 is moved out of the loading opening 5 of the funnel-shaped housing 4 before the converter 1 swings back into the vertical position.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

The invention relates to a process for adding alloying products to molten metal, in particular molten steel during the tapping of a converter into a casting ladle, wherein the alloying products are introduced in the form of a jet into the casting jet of molten metal flowing out, the jet of alloying product enclosing an angle with the vertical plane formed by the molten metal casting jet. The invention is characterised in that, with a changing position of the molten metal casting jet due to a changing casting inclination of the converter or due to a changing size and position of the tapping hole of the converter as a result of wear thereof and/or with a changing position of the alloying product jet due to a changing composition of the alloying product, the direction of the alloying product jet is continuously adjusted for combining the two jets. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine zugehörige Vorrichtung zur Zugabe von Legierungsmitteln in eine Metallschmelze, insbesondere Stahlschmelze beim Abstich eines Konverters in eine Gießpfanne, bei dem die Legierungsmittel in Form eines Strahles mit dem ausfließenden Gießstrahl der Schmelze zusammengebracht werden, indem der Legierungsmittelstrahl mittels einer am Gefäßmantel des Konverters angeordneten Zugabevorrichtung so geführt wird, daß die beiden Strahlen sich treffen, wobei der Legierungsmittelstrahl mit der durch den Gießstrahl gebildeten vertikalen Ebene einen Winkel einschließt. Die zugehörige Vorrichtung besteht aus einem am Gefäßmantel des Konverters angeordneten Zugaberohr für die Legierungsmittel, dessen im Bereich der Abstichöffnung des Konverters angeordnete Austrittsöffnung in Richtung Gießstrahl weist sowie aus Mitteln zum Zuführen von Legierungsmitteln zum Zugaberohr.The invention relates to a method and an associated device for adding alloying agents into a molten metal, in particular molten steel when tapping a converter into a ladle, in which the alloying agents are brought together in the form of a jet with the pouring pouring stream of the melt by the alloying agent jet using an am Vessel jacket of the converter arranged addition device is guided so that the two jets meet, the alloying agent jet forms an angle with the vertical plane formed by the pouring jet. The associated device consists of an addition tube for the alloying means arranged on the vessel jacket of the converter, the outlet opening thereof arranged in the region of the tap opening of the converter pointing in the direction of the pouring jet, and means for supplying alloying means to the addition tube.

Eine derartige Vorrichtung ist aus der deutschen Patentschrift 25 47 686 bekannt. Bei dieser Vorrichtung, bei der das Zugaberohr auf dem Gefäßmantel des Konverters fest angeordnet ist, ist nachteilig, daß Lageänderungen des aus der Abstichöffnung des Konverters austretenden Stahlgießstrahles nicht nachvollzogen werden können. Ein Teil der zugegebenen Desoxidations- und Legierungsmittel trifft den Gießstrahl nicht und löst sich entweder gar nicht oder zu einem nicht gewünschten Zeitpunkt in der Schmelze auf. Hierdurch entstehen unerwünschte Konzentrationsunterschiede, Desoxidationsverzögerungen und Legierungsmittelverluste.Such a device is known from German Patent 25 47 686. In this device, in which the addition pipe is fixedly arranged on the vessel jacket of the converter, it is disadvantageous that changes in the position of the steel pouring jet emerging from the tap opening of the converter cannot be traced. Some of the added deoxidizing and alloying agents do not hit the pouring jet and either do not dissolve at all or dissolve in the melt at an undesired point in time. This creates undesirable differences in concentration, delays in deoxidation and loss of alloying agents.

In der deutschen Offenlegungsschrift 15 83 962 ist ein Verfahren und eine zugehörige Vorrichtung beschrieben worden, bei dem die Legierungsmittel mittels einer Spritzvorrichtung in den Metallschmelzengießstrahl eingebracht werden. Die Spritzvorrichtung ist am Mantel des Konverters fest angebracht und die Zuführung der Legierungsmittel und der erforderlichen Druckluft erfolgt durch flexible Schläuche. Eine solche Vorrichtung ist den erhöhten Belastungen beim Abstich von flüssigem Stahl vielfach nicht gewachsen. Ferner zeigt die Erfahrung, daß zur Förderung mit einer Spritzvorrichtung ein sehr gleichmäßiger Kornaufbau erfoderlich ist. Ein solcher liegt bei Legierungsmitteln im allgemeinen aber nicht vor. Nachteilig ist ferner, daß beim senkrechten Aufeinandertreffen von Gießstrahl und Legierungsmittelstrom Schwierigkeiten bei der Dosierung und Mischung entstehen, und zwar dadurch, daß je nach der Geschwindigkeit, mit der das Legierungsmaterial die Spritzpistole verläßt, ein Abprallen vom Gießstrahl auftreten kann mit zwangsläufig großen Materialverlusten.A method and an associated device have been described in German Offenlegungsschrift 15 83 962, in which the alloying agents are introduced into the molten metal casting jet by means of a spray device. The sprayer is firmly attached to the jacket of the converter and the supply of the alloying agent and the required compressed air is carried out through flexible hoses. Such a device is often not up to the increased stresses when tapping liquid steel. Experience has also shown that a very uniform grain structure is required for conveying with a spraying device. Such is generally not the case with alloying agents. A further disadvantage is that difficulties arise in metering and mixing when the pouring jet and the alloying agent flow meet each other, specifically because, depending on the speed at which the alloy material leaves the spray gun, the pouring jet can ricochet with inevitably large material losses.

Aus der deutschen Patentschrift 27 06 096 ist eine Einrichtung zur Zugabe von Legierungsstoffen bekannt, bei der eine zum Gießstrahl gerichtete Schurre für das Fördern der Legierungsstoffe vorgesehen ist. Die Schurre ist unter einer Abdeckung von einer Ruhestellung in eine Arbeitsstellung ausfahrbar, wobei eine Verstellung der Schurre zwischen der Anfangsposition B und der Endposition C möglich ist.From the German patent specification 27 06 096 a device for adding alloy materials is known, in which a chute directed towards the pouring jet is provided for conveying the alloy materials. The chute can be extended from a rest position into a working position under a cover, it being possible to adjust the chute between the starting position B and the end position C.

Ein Nachteil ist darin zu sehen, daß die Legierungsstoffe aufgrund unterschiedlich langer Fallstrecken in der Schurre und unterschiedlicher Neigungen der Schurre in den verschiedenen Positionen unterschiedliche Geschwindigkeiten aufweisen. Diese unterschiedlichen Geschwindigkeiten erschweren es dem Bedienungsmann, den Legierungsmittelstrom mit dem ausfließenden Metallschmelzenstrom in jeder Lage zusammenzuführen. Weitere Nachteile bestehen darin, daß die bekannte Vorrichtung einen größeren Platzbedarf hat und ein nachträglicher Einbau aufgrund der örtlichen Gegebenheiten in einem Stahlwerk häufig nicht möglich sein dürfte. Aufgrund größerer Transportwege für die Legierungsmittel ergibt sich eine Erhöhung der Transportzeit und damit ein höherer Energieaufwand zum Betreiben der Vorrichtung und höhere Instandhaltungs- und Reparaturkosten. Außerdem bedingt die Vorrichtung einen höheren Investitionsaufwand.A disadvantage is the fact that the alloys have different speeds due to different lengths of fall in the chute and different inclinations of the chute in the different positions. These different speeds make it difficult for the operator to merge the alloying agent flow with the flowing metal melt stream in any position. Further disadvantages consist in the fact that the known device requires more space and that subsequent installation may not be possible due to the local conditions in a steel mill. Because of the longer transport routes for the alloying agents, there is an increase in the transport time and thus a higher energy expenditure for operating the device and higher maintenance and repair costs. In addition, the device requires a higher investment.

Die vorliegende Erfindung hat sich die Aufgabe gestellt, die Nachteile der bekannten Vorrichtungen zu vermeiden und ein Verfahren und eine Vorrichtung vorzuschlagen, die es ermöglichen, daß der Legierungsmittelstrahl den Metallschmelzengießstrahl mit großer Sicherheit trifft und auf diese Weise eine intensivere Auflösung und Verteilung der Legierungsmittel im Schmelzbad eingestellt werden kann.The present invention has set itself the task To avoid disadvantages of the known devices and to propose a method and a device which allow the alloying agent jet to hit the molten metal casting jet with great certainty and in this way a more intensive dissolution and distribution of the alloying agents in the weld pool can be set.

Die Erfindung löst diese Aufgabe verfahrensmäßig mit den im Patentanspruch 1 angegebenen Merkmalen und vorrichtungsgemäß mit den Merkmalen von Patentanspruch 3.The invention solves this problem procedurally with the features specified in claim 1 and device-wise with the features of claim 3.

Beim erfindungsgemäßen Verfahren ist wesentlich, daß bei einer Auseinanderwanderung der beiden Strahlen der Legierungsmittelstrahl bis zum Zusammentreffen mit dem Metallschmelzengießstrahl kontinuierlich nachgestellt werden kann. Auf diese Weise wird sichergestellt, daß bei Nichtzusammentreffen der beiden Strahlen, z.B. bei sich ändernder Lage des Metallschmelzengießstrahles infolge sich ändernder Neigung des Konverters beim Ausgießen der Metallschmelze aus dem Konverter, die Strahlen wieder zusammengeführt werden. Ein Nichtzusammentreffen der beiden Strahlen kann auch eintreten, wenn sich die Lage des Metallschmelzengießstrahles ändert infolge sich ändernder Lage und Größe der Abstichöffnung des Konverters durch Verschleiß oder wenn sich die Lage des Legierungsmittelstrahles ändert aufgrund einer anderen Zusammensetzung des Legierungsmittels, hervorgerufen u.a. durch unterschiedliche Körnungen, Reibungswerte und spezifische Gewichte der Legierungsmittel.It is essential in the process according to the invention that when the two jets drift apart, the alloying agent jet can be continuously readjusted until it meets the molten metal casting jet. In this way it is ensured that if the two beams, e.g. if the position of the molten metal casting jet changes due to the changing inclination of the converter when the molten metal is poured out of the converter, the jets are brought together again. The two jets can also not coincide if the position of the molten metal casting jet changes due to changing position and size of the tap opening of the converter due to wear or if the position of the alloying agent jet changes due to a different composition of the alloying agent, among other things. due to different grain sizes, friction values and specific weights of the alloying agents.

Bei der erfindungsgemäßen Vorrichtung ist wesentlich, daß das Zugaberohr auf dem Gefäßmantel des Konverters, vorzugsweise auf einem Tragring, verschwenkbar angeordnet ist. Nach Anspruch 4 ist ein als Trichter ausgebildetes Gehäuse auf dem Tragring vorgesehen, zur Aufnahme der mit einer Förderrinne herangebrachten Legierungsmittel und zur Weitergabe an das sich anschließende Zugaberohr. Falls ein Tragring nicht oder nicht an der entsprechenden Stelle des Konverters vorhanden ist, kann eine Konsole am Konvertermantel befestigt werden.In the device according to the invention it is essential that the addition tube is arranged pivotably on the vessel jacket of the converter, preferably on a support ring. According to claim 4, a housing designed as a funnel is provided on the support ring, for receiving the alloying means brought in with a conveying trough and for passing it on to the subsequent addition pipe. If a support ring is not or not available at the corresponding point on the converter, a bracket can be attached to the converter jacket.

Bevorzugte Ausführungsformen der Erfindung sind Gegenstand von Unteranspruch 2 bezüglich des Verfahrens und Gegenstand der Unteransprüche 5 bis 10 bezüglich der Vorrichtung.Preferred embodiments of the invention are the subject of subclaim 2 regarding the method and the subject of subclaims 5 to 10 regarding the device.

Weitere Vorteile des erfindungsgemäßen Verfahrens und der erfindungsgemäßen Vorrichtung bestehen darin, daß ein nachträglicher Einbau der Vorrichtung gut möglich ist und dafür nur geringe Investitionskosten aufgewendet werden müssen. Ferner zeichnet sich die Vorrichtung durch kurze Transportwege und hohe Betriebssicherheit aus; der Energieaufwand zum Betreiben der Anlage und die Instandhaltungs- und Reparaturkosten sind gering.Further advantages of the method according to the invention and the device according to the invention consist in the fact that a subsequent installation of the device is easily possible and only low investment costs have to be used for this. Furthermore, the device is characterized by short transport routes and high operational reliability; the energy expenditure for operating the system and the maintenance and repair costs are low.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung erläutert. Es zeigt:

Figur 1:
Die Ansicht eines Konverters zur Herstellung von Stahl in der senkrechten Arbeitsposition.
Figur 2:
Eine seitliche Ansicht des Konverters in Gießposition mit zugehöriger Gießpfanne in Richtung des Pfeiles A gemäß Figur 1.
Figur 3:
Eine Vorderansicht des Konverters in Gießposition in Richtung des Pfeiles B gemäß Figur 2.
Figur 4:
Eine Aufsicht auf den senkrecht stehenden Konverter in Richtung des Pfeiles C gemäß Figur 1.
Figur 5:
Ein Ausschnitt in vergrößertem Maßstab bei D gemäß Figur 1.
Figur 6:
Ein Ausschnitt in vergrößertem Maßstab bei D gemäß Figur 1.
Figur 7:
Ein Ausschnitt in vergrößertem Maßstab bei D gemäß Figur 1.
An embodiment of the invention is explained below with reference to the drawing. It shows:
Figure 1:
The view of a converter for the production of steel in the vertical working position.
Figure 2:
A side view of the converter in the casting position with the associated ladle in the direction of arrow A according to Figure 1.
Figure 3:
A front view of the converter in the casting position in the direction of arrow B according to Figure 2.
Figure 4:
A top view of the vertical converter in the direction of arrow C according to FIG. 1.
Figure 5:
A section on an enlarged scale at D according to FIG. 1.
Figure 6:
A section on an enlarged scale at D according to FIG. 1.
Figure 7:
A section on an enlarged scale at D according to FIG. 1.

Die Figuren 1 bis 4 zeigen einen Konverter 1 zur Herstellung von Stahl, wobei in den Figuren 1 und 4 der Konverter in der Arbeitsposition und in den Figuren 2 und 3 in der Gießposition dargestellt ist. Auf einem Tragring 2 oberhalb der Tragzapfen 1a im Bereich des Konverterhutes 3 ist ein trichterförmiges Gehäuse 4 zur Aufnahme der Legierungsmittel angeordnet. Das Gehäuse 4 weist eine seitliche Beschickungsöffnung 5 und eine untere Austrittsöffnung 6 auf. An diese Austrittsöffnung 6 schließt sich ein Zugaberohr 7 mit seiner Eintrittsöffnung 8 an.1 to 4 show a converter 1 for the production of steel, the converter being shown in the working position in FIGS. 1 and 4 and the casting position in FIGS. 2 and 3. On a support ring 2 above the support pin 1a in the area of the converter hat 3 is a funnel-shaped Housing 4 arranged for receiving the alloying agent. The housing 4 has a side loading opening 5 and a lower outlet opening 6. At this outlet opening 6 there is an addition pipe 7 with its inlet opening 8.

Die Austrittsöffnung 9 des Zugaberohres 7 weist in Richtung des Stahlgießstrahles 11, der in Gießstellung des Konverters 1 aus der Abstichöffnung 10 austritt; wie die Figuren 2 und 3 zeigen, trifft der Legierungsmittelstrahl 12 den Stahlgießstrahl 11 vor dem Eintritt in die Gießpfanne 13.
Das Zugaberohr 7 ist im Bereich seiner Eintrittsöffnung 8 über eine Gelenkvorrichtung am Tragring 2 schwenkbar befestigt. Zur kontinuierlichen Verstellung des Zugaberohres 7 ist auf dem Tragring 2 ein elektro-mechanisches, wassergekühltes Verstellgerät 14 angeordnet.
Wie im einzelnen Figur 5 zeigt, ist das Verstellgerät 14 über ein Befestigungsstück 17 an einem Befestigungssupport 18 angelenkt, welches auf dem Tragring 2 befestigt ist. An der Hubstange 16 ist ein Scherenheber 19 angeordnet, dessen oberer Arm 21 über eine Lagerscheibe 22 mit der Spitze des Zugaberohres 7 und dessen unterer Arm 20 über eine weitere Lagerscheibe 23 mit dem Tragring 2 gelenkig verbunden sind. Figur 6 zeigt, daß durch Ausfahren der Hubstange 16 die Arme 20 und 21 des Scherenhebers 19 gespreizt werden, so daß auf diese Weise das Zugaberohr 7 kontinuierlich verstellt werden kann. Eine U-förmige Rohrführung 31 verhindert das Kippen des Zugaberohres 7 beim Schwenken des Konverters 1.The outlet opening 9 of the addition pipe 7 points in the direction of the steel pouring jet 11, which emerges from the tap opening 10 in the casting position of the converter 1; As FIGS. 2 and 3 show, the alloy medium jet 12 hits the steel pouring jet 11 before it enters the ladle 13.
The addition tube 7 is pivotally fastened in the region of its inlet opening 8 via a joint device on the support ring 2. For the continuous adjustment of the addition tube 7, an electro-mechanical, water-cooled adjusting device 14 is arranged on the support ring 2.
As shown in detail in FIG. 5, the adjusting device 14 is articulated via a fastening piece 17 to a fastening support 18 which is fastened on the support ring 2. A scissor jack 19 is arranged on the lifting rod 16, the upper arm 21 of which is articulated via a bearing plate 22 to the tip of the addition tube 7 and the lower arm 20 of which is connected to the supporting ring 2 via a further bearing plate 23. Figure 6 shows that by extending the lifting rod 16, the arms 20 and 21 of the scissor lift 19 are spread, so that the addition tube 7 can be continuously adjusted in this way. A U-shaped pipe guide 31 prevents the addition tube 7 from tilting when the converter 1 is pivoted.

Figur 7 zeigt die Ausbildung der Gelenkvorrichtung im Bereich der Eintrittsöffnung 8 des Zugaberohres 7. Sie besteht aus einer Konsole 32, die auf dem Tragring 2 befestigt ist und aus einer zugehörigen Halterung 33 am Zugaberohr 7. Die Konsole 32 und die Halterung 33 sind über einen Gewindebolzen 34 mit Gegenmuttern 37, der in nicht dargestellen Bohrungen der beiden Teile angeordnet ist, miteinander verbunden. Auf dem Gewindebolzen 34 angeordnete, ballig ausgebildete Scheiben 35 und ein Tellerfederpaket 36 sorgen für die federnd gelenkige Ausbildung der Gelenkvorrichtung.FIG. 7 shows the design of the articulation device in the area of the inlet opening 8 of the addition tube 7. It consists of a bracket 32 which is fastened on the support ring 2 and an associated holder 33 on the addition tube 7. The bracket 32 and the holder 33 are connected via a Threaded bolt 34 with lock nuts 37, which is arranged in bores of the two parts, not shown, connected to one another. Crowned disks 35 arranged on the threaded bolt 34 and a plate spring assembly 36 ensure the resiliently articulated design of the joint device.

Die Stromversorgungs- und Steuerungskabel und die Kühlwasserleitungen für das Verstellgerät 14 verlaufen in nicht dargestellter Weise im Tragring 2 und durch einen der Tragzapfen 1a des Konverters 1 zu den Versorgungsquellen bzw. zu einem Konverter-Abstichstand 24 auf der Arbeitsplattform 25.
Wie in den Figuren 1, 3 und 4 dargestellt, ist auf der Arbeitsplattform 25 eine Schwingförderrinne 26 zur Beförderung der Legierungsmittel in das trichterförmige Gehäuse 4 angeordnet; die Schwingförderrinne 26 ist auf Schienen 27 verfahrbar. Zum Vor- und Zurückfahren der Förderrinne 26 dient ein pneumatisch wirkendes Kolben-Zylinder-Aggregat 28; der Zylinder des Aggregates 28 ist dabei mit dem Fahrgestell der Förderrinne 26 und die Kolbenstange 29, mit einem außen liegenden Festlager, verbunden.
Vom Abstichstand 24 aus wird das elektro-mechanische Verstellgerät 14 durch einen Bedienungsmann betätigt. Ferner ist im Abstichstand 24 eine an sich bekannte Konverter-Lage-Erfassung angeordnet, mit welcher entsprechend der Konverterlage und der Gießdauer die Schwingförderrinne 26 über einen Antrieb 26a in Betrieb gesetzt und das pneumatische Kolben-Zylinder-Aggregat 28 zum Vor- und Zurückfahren der Förderrinne 26 gesteuert wird. Die erfindungsgemäße Vorrichtung zum Einbringen von Legierungsstoffen wird wie folgt betätigt:
Nach Beendigung des Blasprozesses wird der Konverter 1 aus der Arbeitsposition gemäß den Figuren 1 und 4 in die Gießposition gedreht, wie die Figuren 2 und 3 zeigen. Bei Erreichen der Gießposition wird die Schwingförderrinne 26 entsprechend der Konverter-Lage-Erfassung soweit vorgefahren, daß der vordere Abschnitt der Förderrinne 26 in die seitliche Beschickungsöffnung 5 des trichterförmigen Gehäuses 4 hineinragt.
Aus nicht dargestellten Bunkern gelangen jetzt die Legierungsmittel über die in Betrieb gesetzte Schwingförderrinne 26 in das Gehäuse 4 und durch das sich anschließende Zugaberohr 7 in den Stahlgießstrahl 11.The power supply and control cables and the cooling water lines for the adjusting device 14 run in a manner not shown Way in the support ring 2 and through one of the support pins 1a of the converter 1 to the supply sources or to a converter tapping stand 24 on the work platform 25.
As shown in FIGS. 1, 3 and 4, a vibrating conveyor trough 26 for conveying the alloying agents into the funnel-shaped housing 4 is arranged on the working platform 25; the vibrating conveyor trough 26 can be moved on rails 27. A pneumatically acting piston-cylinder unit 28 serves to move the feed trough 26 back and forth; the cylinder of the assembly 28 is connected to the chassis of the conveyor trough 26 and the piston rod 29 to an external fixed bearing.
The electro-mechanical adjusting device 14 is actuated by an operator from the tapping stand 24. Furthermore, a converter position detection known per se is arranged in the tapping stand 24, with which, according to the converter position and the casting time, the vibrating conveyor trough 26 is activated via a drive 26a and the pneumatic piston-cylinder unit 28 for moving the conveyor trough back and forth 26 is controlled. The device according to the invention for introducing alloy substances is operated as follows:
After the blowing process, the converter 1 is rotated from the working position according to FIGS. 1 and 4 into the casting position, as shown in FIGS. 2 and 3. When the casting position is reached, the vibrating conveyor trough 26 is advanced so far in accordance with the converter position detection that the front section of the conveyor trough 26 projects into the lateral loading opening 5 of the funnel-shaped housing 4.
From bunkers (not shown), the alloying agents now enter the housing 4 via the vibrating conveyor trough 26 that has been put into operation, and through the subsequent addition pipe 7 into the steel pouring jet 11.

Die sinkende Höhe der Stahlschmelze im Konverter 1 wird durch weiteres Verschwenken des Konverters ausgeglichen; hierdurch ändert sich jedoch die Lage des Stahlgießstrahles 11. Damit die Legierungsstoffe weiterhin den Gießstrahl 11 treffen, betätigt der Bedienungsmann vom Abstichstand 24 aus das Verstellgerät 14, wodurch das Zugaberohr 7 entsprechend kontinuierlich nachgestellt wird. Hierdurch ist sichergestellt, daß der austretende Legierungsmittelstrahl 12 den Stahlgießstrahl 11 trifft.The falling height of the molten steel in converter 1 is compensated for by further pivoting of the converter; however, this changes the position of the steel pouring jet 11. So that the alloys continue to hit the pouring jet 11, the operator actuates the adjusting device 14 from the tapping stand 24, as a result of which the addition tube 7 is correspondingly continuously adjusted. This ensures that the exiting Alloy medium jet 12 hits the steel pouring jet 11.

Die Verstellung des Zugaberohres 7 durch Betätigung des Verstellgerätes 14 wird auch durchgeführt, wenn sich die Lage des Stahlgießstrahles 11 mit zunehmendem Alter der Abstichöffnung 10 verändert oder wenn die Lage des Legierungsmittelstrahles 12 sich ändert infolge sich ändernder Zusammensetzung des Legierungsmittels.The adjustment of the addition tube 7 by actuating the adjusting device 14 is also carried out if the position of the steel pouring jet 11 changes with increasing age of the tap opening 10 or if the position of the alloying agent jet 12 changes as a result of the changing composition of the alloying agent.

Nach Abstichende wird die Schwingförderrinne 26 über die Konverter-Lage-Erfassung so gesteuert, daß vor Beginn des Zurückschwenkens des Konverters 1 in die senkrechte Position die Förderrinne 26 aus der Beschickungsöffnung 5 des trichterförmigen Gehäuses 4 herausgefahren wird.After tapping, the vibrating conveyor trough 26 is controlled via the converter position detection in such a way that the conveyor trough 26 is moved out of the loading opening 5 of the funnel-shaped housing 4 before the converter 1 swings back into the vertical position.

Claims (10)

  1. A process for the addition of alloying agents to a metal melt, more particularly a steel melt, during the tapping of a converter into a casting ladle, wherein the alloying agent in the form of a jet is brought together with the emerging jet of cast molten metal, the jet of alloying agent being so guided by means of an supply device disposed on the jacket of the converter that the two jets meet one another, the jet of alloying agent enclosing an angle with the vertical plane formed by the cast jet of molten metal, characterized in that if the two jets move apart, the jet of alloying agent is continuously readjusted until it meets the cast jet of molten metal.
  2. A process according to claim 1, characterized in that the position of the converter is continuously determined and the start and end of the adding of the alloying agent is controlled in dependence on the position of the converter and the duration of casting.
  3. An apparatus for adding alloying agents to a metal melt, more particularly a steel melt, during the tapping of a converter into a casting ladle, wherein the alloying agent in the form of a jet is moved into the emerging cast jet of molten metal, the apparatus comprising an supply tube which is disposed on the jacket of the converter and whose outlet opening, disposed in the zone of the tapping opening of the converter, points in the direction of the cast jet of molten metal, means also being provided for feeding alloying agents to the supply tube, characterized in that the supply tube (7) is pivotably disposed on the jacket of the converter (1).
  4. An apparatus according to claim 3, characterized in that disposed on a supporting ring (2) above the supporting pins (1a) of the converter (1) is a casing (4) which is constructed in the form of a funnel and has a charging opening (5) for the alloying agent, supplied via a conveying trough (26), and an outlet opening (6) for the emergence of the alloying agent into the supply tube (7), which is also disposed on the supporting ring (2) and whose inlet opening (8) is connected to the outlet opening (6) of the casing (4).
  5. An apparatus according to claim 4, characterized in that in the zone of its inlet opening (8) the supply tube (7) is attached via a link device (32, 33, 34, 35, 36) to the supporting ring (2), and in the zone of the outlet opening (9) of the supply tube (7) a continuously operable adjusting apparatus (14) is disposed on the supporting ring (2) and hinged to the supply tube (7) via a lifting rod (16).
  6. An apparatus according to claims 4 and 5, characterized in that the adjusting apparatus (14) is water-cooled and constructed to be adjusted electro-mechanically.
  7. An apparatus according to one of claims 3 to 6, characterized in that the casing (15) of the adjusting apparatus (14) is resiliently connected to the supporting ring (2), and articulated to the lifting rod (16) of the adjusting apparatus (14) is a two-armed scissor-type jack, one arm (20) being hinged to the supporting ring (2) and the other arm (21) being hinged to the supply tube (7).
  8. An apparatus according to one of claims 3 to 7, characterized in that in the casting position of the converter (1) the charging opening (5) of the funnel-like casing (4) is positioned at the level of the movable conveying trough (26), and the charging opening (5) is constructed for the entry and exit of the front portion of the conveying trough (26).
  9. An apparatus according to one of claims 3 to 8, characterized in that the movable conveying trough (26) takes the form of a vibrator trough which can be moved by means of a pneumatic piston-and-cylinder unit (28).
  10. An apparatus according to one of claims 3 to 9, characterized by an apparatus which determines the position of the converter and during casting controls the conveying trough (26) and the piston-and-cylinder unit (28) in accordance with the casting position of the converter (1).
EP89107892A 1988-05-03 1989-05-01 Process and installation for adding alloying products to a molten metal stream Expired - Lifetime EP0340711B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89107892T ATE92112T1 (en) 1988-05-03 1989-05-01 METHOD AND APPARATUS FOR ADDING ALLOYING AGENTS INTO A METAL CASTING BEAM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3814907 1988-05-03
DE3814907A DE3814907A1 (en) 1988-05-03 1988-05-03 METHOD AND DEVICE FOR ADDING ALLOY AGENTS INTO A METAL CASTING JET

Publications (3)

Publication Number Publication Date
EP0340711A2 EP0340711A2 (en) 1989-11-08
EP0340711A3 EP0340711A3 (en) 1990-03-21
EP0340711B1 true EP0340711B1 (en) 1993-07-28

Family

ID=6353427

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Application Number Title Priority Date Filing Date
EP89107892A Expired - Lifetime EP0340711B1 (en) 1988-05-03 1989-05-01 Process and installation for adding alloying products to a molten metal stream

Country Status (4)

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EP (1) EP0340711B1 (en)
AT (1) ATE92112T1 (en)
DE (2) DE3814907A1 (en)
ES (1) ES2043937T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO165686C (en) * 1988-08-04 1991-03-20 Elkem As DEVICE FOR SUPPLYING INOCULATOR TO A OESE.
DE19535014C2 (en) * 1995-09-21 1999-03-04 Stein Ind Anlagen Inh Christel Process for introducing granular solids into molten metals
GB0007073D0 (en) * 2000-03-24 2000-05-17 Qual Chem Limited Iron and steelmaking
US6471742B2 (en) * 2001-01-22 2002-10-29 Oscar G. Dam Method for producing an improved charging stock for use in metallurgical processes
AT504079B1 (en) * 2006-09-13 2008-09-15 Siemens Vai Metals Tech Gmbh METHOD FOR EXTRACTING MELT FROM A TILTABLE METALLURGICAL VESSEL AND APPARATUS FOR CARRYING OUT THE METHOD
KR102300458B1 (en) * 2016-04-25 2021-09-09 닛폰세이테츠 가부시키가이샤 Molten iron desulfurization method and desulfurization device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE435596C (en) * 1925-03-14 1926-10-15 Gustav Hilger Distribution device for loading ovens
US3511490A (en) * 1967-02-24 1970-05-12 Brown Fintube Co Apparatus for introducing addition agent into molten steel
DE2632707C3 (en) * 1976-07-21 1983-04-07 Ernst Dipl.-Ing. 4006 Erkrath Beiersdorf Charging system on electric arc furnaces for adding alloying agents and aggregates
AT345491B (en) * 1976-12-10 1978-09-25 Voest Ag DEVICE FOR ADDING ADDITIVES INTO A CAST METAL JET

Also Published As

Publication number Publication date
DE3814907A1 (en) 1989-11-09
ATE92112T1 (en) 1993-08-15
EP0340711A2 (en) 1989-11-08
DE3814907C2 (en) 1990-04-12
DE58905013D1 (en) 1993-09-02
ES2043937T3 (en) 1994-01-01
EP0340711A3 (en) 1990-03-21

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