EP0304688A1 - Immersion lance - Google Patents

Immersion lance Download PDF

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Publication number
EP0304688A1
EP0304688A1 EP88112609A EP88112609A EP0304688A1 EP 0304688 A1 EP0304688 A1 EP 0304688A1 EP 88112609 A EP88112609 A EP 88112609A EP 88112609 A EP88112609 A EP 88112609A EP 0304688 A1 EP0304688 A1 EP 0304688A1
Authority
EP
European Patent Office
Prior art keywords
steel
pipe
ceramic
immersion lance
tube
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.)
Withdrawn
Application number
EP88112609A
Other languages
German (de)
French (fr)
Inventor
Erich Struzik
Gerd Venn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plibrico Co GmbH
Original Assignee
Plibrico Co GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Plibrico Co GmbH filed Critical Plibrico Co GmbH
Publication of EP0304688A1 publication Critical patent/EP0304688A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C21C5/4613—Refractory coated lances; Immersion lances

Definitions

  • the invention relates to a refractory ceramic immersion lance in the form of a tube, in which at least one continuous channel is provided in the axial direction, the reaction, inert or carrier gases flow.
  • Immersion lances are used to blow gases, possibly with solid powdered treatment substances such as lime, for cleaning or reaction under the surface of molten metal.
  • solid powdered treatment substances such as lime
  • the lances When the lances are immersed into the molten metal through the liquid slag layer floating on the bath surface, the molten metal must withstand the high temperatures in it above 1400 ° C. Therefore, fire-resistant ceramics are usually used, but they only have a limited lifespan because they are attacked by liquid metal and liquid slag corrosively and erosively.
  • the invention has for its object to increase the life of diving lances.
  • a layer made of ceramic fiber fleece is arranged on the contact surface between the two at the immersion lance consisting of a steel tube and surrounded by a refractory ceramic jacket tube. Through this ceramic The lance is shrunk with a non-woven layer. The difference in thermal expansion between the steel and ceramic tube is absorbed by the nonwoven layer, which acts as a sliding layer. This prevents the formation of cracks in the ceramic jacket tube if the immersion lance is subjected to high temperature changes when immersed in the metal melt or when it is pulled out.
  • a further pipe made of steel is to be arranged coaxially in the steel pipe at a distance therefrom and a pourable or sprayable ceramic mass between the steel pipes in addition to the ceramic nonwoven layer between the casing pipe and the outer steel pipe.
  • a layer 3 of ceramic fiber fleece is arranged on the contact surface between the steel tube 1 and the jacket tube 2 of ceramic material surrounding it concentrically.
  • a further steel pipe 4 is additionally arranged coaxially in the steel pipe 1 at a distance from this.
  • the space between the two steel pipes 1.4 is filled with pourable or sprayable refractory compound.
  • a pressure compensation spring 6 can be arranged on the head of the immersion lance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The immersion lance consists of a steel pipe which is surrounded by a refractory ceramic shell pipe. The invention is characterised in that a layer (3) of ceramic fibre nonwoven is located at the contact surface between the steel pipe (1) and the shell pipe (2). In the steel pipe (1) a further pipe (4) of steel can be arranged at a distance from the former, and a castable or sprayable ceramic mass (5) can be coaxially arranged between the steel pipes (1) and (4). <IMAGE>

Description

Die Erfindung betrifft eine feuerfeste keramische Tauchlanze in Form eines Rohres, in welchem in axialer Richtung mindestens ein durchgehender Kanal vorgesehen ist, den Reaktions-, Innert- oder Trägergase strömen.The invention relates to a refractory ceramic immersion lance in the form of a tube, in which at least one continuous channel is provided in the axial direction, the reaction, inert or carrier gases flow.

Tauchlanzen werden benutzt, um Gase, ggf. mit festen pulverförmigen Behandlungsstoffen, wie Kalk, zur Reinigung oder Reaktion unter die Oberfläche von Metallschmelzen zu blasen. Beim Eintauchen der Lanzen durch die auf der Badoberfläche schwimmende flüssige Schlackeschicht in die Metallschmelze hinein muß diese den darin herrschenden hohen Temperaturen über 1400 °C standhalten. Daher verwendet man üblicherweise feuerfeste Keramik, die allerdings auch nur begrenzte Lebensdauer hat, weil sie von flüssigem Metall und flüssiger Schlacke korrosiv und erosiv angegriffen wird.Immersion lances are used to blow gases, possibly with solid powdered treatment substances such as lime, for cleaning or reaction under the surface of molten metal. When the lances are immersed into the molten metal through the liquid slag layer floating on the bath surface, the molten metal must withstand the high temperatures in it above 1400 ° C. Therefore, fire-resistant ceramics are usually used, but they only have a limited lifespan because they are attacked by liquid metal and liquid slag corrosively and erosively.

Der Erfindung liegt die Aufgabe zugrunde, die Lebensdauer von Tauchlanzen zu erhöhen.The invention has for its object to increase the life of diving lances.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß bei der aus einem Stahlrohr bestehenden Tauchlanze, das von einem feuerfesten keramischen Mantelrohr umgeben ist, an der Kontaktfläche zwischen beiden eine Lage aus keramischem Faservlies angeordnet ist. Durch diese keramische Faservlieslage wird die Lanze schwindungsarm. Die unterschiedliche Wärmeausdehnung zwischen Stahl- und Keramikrohr wird durch die Faservlieslage, die quasi als Gleitlage wirkt, aufgefangen. Verhindert so die Bildung von Rissen im keramischen Mantelrohr, wenn die Tauchlanze beim Eintauchen in die Metallschmelze bzw. Herausziehen hohen Temperaturwechselbeanspruchungen unterworfen wird.This object is achieved in that a layer made of ceramic fiber fleece is arranged on the contact surface between the two at the immersion lance consisting of a steel tube and surrounded by a refractory ceramic jacket tube. Through this ceramic The lance is shrunk with a non-woven layer. The difference in thermal expansion between the steel and ceramic tube is absorbed by the nonwoven layer, which acts as a sliding layer. This prevents the formation of cracks in the ceramic jacket tube if the immersion lance is subjected to high temperature changes when immersed in the metal melt or when it is pulled out.

Gemäß einer vorteilhaften Ausgestaltung der erfindungsgemäßen Tauchlanze soll in dem Stahlrohr mit Abstand zu diesem koaxial ein weiteres Rohr aus Stahl und zwischen den Stahlrohren eine gieß- oder spritzfähige keramische Masse zusätzlich zu der keramischen Faservlieslage zwischen Mantelrohr und äußerem Stahlrohr angeordnet sein. Durch diese Maßnahme werden das Widerstandsmoment, die Bruchsicherheit und Biegefestigkeit sowie Rißbeständigkeit der Tauchlanze erhöht und damit letztlich die Lebendauer der Lanze erhöht.According to an advantageous embodiment of the immersion lance according to the invention, a further pipe made of steel is to be arranged coaxially in the steel pipe at a distance therefrom and a pourable or sprayable ceramic mass between the steel pipes in addition to the ceramic nonwoven layer between the casing pipe and the outer steel pipe. This measure increases the section modulus, the resistance to breakage and bending strength as well as the crack resistance of the immersion lance and thus ultimately increases the longevity of the lance.

In der Zeichnung sind Ausführungsbeispiele der erfindungsgemäßen Tauchlanze dargestellt. Im einzelnen zeigen

  • Fig. 1 im Längsschnitt ein Ausführungsbeispiel,
  • Fig. 2 den zugehörigen Querschnitt,
  • Fig. 3 im Längsschnitt ein weiteres Ausführungsbeispiel,
  • Fig. 4 einen Querschnitt längs der Linie A-A aus Fig. 3,
Exemplary embodiments of the immersion lance according to the invention are shown in the drawing. Show in detail
  • 1 shows an embodiment in longitudinal section,
  • 2 shows the associated cross section,
  • 3 shows a further embodiment in longitudinal section,
  • 4 shows a cross section along the line AA from FIG. 3,

Gleiche Teile sind in den verschiedenen Figuren mit denselben Bezugszeichen versehen.Identical parts are provided with the same reference symbols in the different figures.

Bei der Ausführung der Tauchlanze gemäß Fig. 1 und 2 ist an der Kontaktfläche zwischen dem Stahlrohr 1 und dem dieses konzentrisch umgebenden Mantelrohr 2 aus keramischem Material eine Lage 3 aus keramischem Faservlies angeordnet.1 and 2, a layer 3 of ceramic fiber fleece is arranged on the contact surface between the steel tube 1 and the jacket tube 2 of ceramic material surrounding it concentrically.

Bei der anderen Ausführung gemäß Fig. 3 und 4 ist zusätzlich in dem Stahlrohr 1 mit Abstand zu diesem koaxial ein weiteres Stahlrohr 4 angeordnet. Den Zwischenraum zwischen beiden Stahlrohren 1,4 füllt man mit gieß- oder spritzfähiger Feuerfestmasse aus.In the other embodiment according to FIGS. 3 and 4, a further steel pipe 4 is additionally arranged coaxially in the steel pipe 1 at a distance from this. The space between the two steel pipes 1.4 is filled with pourable or sprayable refractory compound.

Am Kopf der Tauchlanze kann eine Druckausgleichsfeder 6 angeordnet sein.A pressure compensation spring 6 can be arranged on the head of the immersion lance.

Claims (2)

1. Tauchlanze bestehend aus einem Stahlrohr, das von einem feuerfesten keramischen Mantelrohr umgeben ist, dadurch gekennzeichnet, daß an der Kontaktfläche zwischen Stahlrohr (1) und Mantelrohr (2) eine Lage (3) aus keramischen Faservlies angeordnet ist.1. Immersion lance consisting of a steel tube, which is surrounded by a refractory ceramic jacket tube, characterized in that a layer (3) made of ceramic fiber fleece is arranged on the contact surface between the steel tube (1) and jacket tube (2). 2. Tauchlanze nach Anspruch 1, dadurch gekennzeichnet, daß in dem Stahlrohr (1) mit Abstand zu diesem koaxial ein weiteres Rohr (4) aus Stahl und zwischen den Stahlrohren (1) und (4) eine gieß- oder spritzfähige feuerfeste keramische Masse (5) angeordnet sind.2. Immersion lance according to claim 1, characterized in that in the steel tube (1) at a distance from this coaxial another tube (4) made of steel and between the steel tubes (1) and (4) a pourable or sprayable refractory ceramic mass ( 5) are arranged.
EP88112609A 1987-08-28 1988-08-03 Immersion lance Withdrawn EP0304688A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873728724 DE3728724A1 (en) 1987-08-28 1987-08-28 DIVE LANCE
DE3728724 1987-08-28

Publications (1)

Publication Number Publication Date
EP0304688A1 true EP0304688A1 (en) 1989-03-01

Family

ID=6334679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112609A Withdrawn EP0304688A1 (en) 1987-08-28 1988-08-03 Immersion lance

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EP (1) EP0304688A1 (en)
DE (1) DE3728724A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009060827A1 (en) 2009-12-29 2011-06-30 SMS Siemag Aktiengesellschaft, 40237 Lance head for a lance with a ceramic nozzle insert
CN109457079A (en) * 2019-01-11 2019-03-12 何斌 A kind of pneumatic steelmaking oxygen rifle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819714A1 (en) * 1978-05-05 1979-11-08 Purmetall Ges Fuer Stahlveredl Immersion lance for treating molten metals, esp. steel - where lance is made using two tubes of different shape, preventing vibration and increasing lance life
SU735640A1 (en) * 1977-11-04 1980-05-25 Череповецкий Ордена Ленина Металлургический Завод Им. 50-Летия Ссср Tuyere for deep blasting of metal
GB2114721A (en) * 1982-01-22 1983-08-24 Gordon William Taylor Injection lances for molten metal
FR2537698A1 (en) * 1982-12-08 1984-06-15 Lafarge Refractaires Device for protecting a metal tube subjected to severe thermal conditions.
DD238813A5 (en) * 1981-03-24 1986-09-03 Vasipari Kutato Es Fejlesztoe Vallalat,Hu BLASLANT FOR THE TREATMENT OF METAL MELTS IN HUETTENWERKSANLAGEN

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU735640A1 (en) * 1977-11-04 1980-05-25 Череповецкий Ордена Ленина Металлургический Завод Им. 50-Летия Ссср Tuyere for deep blasting of metal
DE2819714A1 (en) * 1978-05-05 1979-11-08 Purmetall Ges Fuer Stahlveredl Immersion lance for treating molten metals, esp. steel - where lance is made using two tubes of different shape, preventing vibration and increasing lance life
DD238813A5 (en) * 1981-03-24 1986-09-03 Vasipari Kutato Es Fejlesztoe Vallalat,Hu BLASLANT FOR THE TREATMENT OF METAL MELTS IN HUETTENWERKSANLAGEN
GB2114721A (en) * 1982-01-22 1983-08-24 Gordon William Taylor Injection lances for molten metal
FR2537698A1 (en) * 1982-12-08 1984-06-15 Lafarge Refractaires Device for protecting a metal tube subjected to severe thermal conditions.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED, Sektion Chemical, Woche D13, 6. März 1981, Zusammenfassungsnr. M24, Derwent Publications Ltd., London, GB; & SU - A - 735 640 (CHERP METALLURG WKS) 26.5.1980 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009060827A1 (en) 2009-12-29 2011-06-30 SMS Siemag Aktiengesellschaft, 40237 Lance head for a lance with a ceramic nozzle insert
EP2341155A1 (en) 2009-12-29 2011-07-06 SMS Siemag AG Lance head for a blowing lance comprising a ceramic nozzle insert
CN109457079A (en) * 2019-01-11 2019-03-12 何斌 A kind of pneumatic steelmaking oxygen rifle

Also Published As

Publication number Publication date
DE3728724A1 (en) 1989-03-09

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