EP1315841B1 - Verfahren zur metallurgischen behandlung von flüssigem stahl mit sauerstoff in einem aufblaskonverter - Google Patents

Verfahren zur metallurgischen behandlung von flüssigem stahl mit sauerstoff in einem aufblaskonverter Download PDF

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Publication number
EP1315841B1
EP1315841B1 EP00972070A EP00972070A EP1315841B1 EP 1315841 B1 EP1315841 B1 EP 1315841B1 EP 00972070 A EP00972070 A EP 00972070A EP 00972070 A EP00972070 A EP 00972070A EP 1315841 B1 EP1315841 B1 EP 1315841B1
Authority
EP
European Patent Office
Prior art keywords
lance
oxygen
blowing lance
oxygen blowing
temperature probe
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
EP00972070A
Other languages
English (en)
French (fr)
Other versions
EP1315841A1 (de
EP1315841A4 (de
Inventor
Bernd Feldhaus
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.)
Berry Metal Co
Original Assignee
Berry Metal Co
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 Berry Metal Co filed Critical Berry Metal Co
Publication of EP1315841A1 publication Critical patent/EP1315841A1/de
Publication of EP1315841A4 publication Critical patent/EP1315841A4/de
Application granted granted Critical
Publication of EP1315841B1 publication Critical patent/EP1315841B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • C21C7/068—Decarburising
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • 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
    • C21C5/4673—Measuring and sampling devices

Definitions

  • oxygen is blown onto the top of the molten steel under the control of a blowing lance.
  • the oxygen lance is subjected to a high thermal load during this top blowing, particularly on its front end. It is therefore typical to cool the lance down intensively.
  • the most effective way to cool an oxygen blowing lance is to thoroughly flush the head of the lance with a large volume of cool water under high pressure.
  • the head of the lance is made of a material with good thermal conductivity, such as copper.
  • the invention concerns a water cooled oxygen blowing lance made up of a shafted lance body and lance head, for implementation of this process more specifically, with an oxygen supply that runs through the lance body and flows to blowing nozzles distributed in the lance head and with outlet and inlet passageways for water running through the lance body to the cooling chambers in the lance head.
  • the invention is based on the task of creating an oxygen blowing lance that to a great extent is protected from the release of water.
  • the problem is solved in that the temperature in the lance head of the blowing lance, which is transferred from the molten steel to the lance head is monitored using at least one of the temperature probes which are integrated into the lance head and regulated by cooling off with water and/or with an oxygen supply and/or the addition of aggregates and/or the distance of the lance head from the molten metal bath.
  • the abrasion on the front end of the lance head as a function of the tool life and the temperature curve as a function of the tool life can be primarily considered as correction sizes.
  • the rate and the time of the addition influence temperature regulation.
  • scrap for cooling briquettes, ores, lime and other similar things are considered as aggregates.
  • the temperature of the melting bath surface radiating directly onto the front end of the lance head is detected through the temperature in the lance head. Using this measurement of the temperature the metallurgical process of the refinement can be controlled. At the same time the head of the blowing lance can be protected from the release of water through the various individual steps or through a combination of measures.
  • the above task is solved by integrating at least one temperature probe in the lance head behind its front end and between the cooling chambers, the signal lines of which are ducted through the lance body.
  • the temperature of the local area in the lance head can be determined, and from experience used as an indicator of the danger of rupturing.
  • the temperature of the local area in the lance head can be determined, and from experience used as an indicator of the danger of rupturing.
  • the oxygen piping is situated in the middle of the lance head and surrounded with inlet and outlet channels for the cooling water through the formation of coaxial ring channels, where the outermost ring channel is the outlet channel and the center ring channel is the inlet channel.
  • the temperature probe can be put in a bore hole of a nose saddle of the lance head using a disconnectable adapter which is secured inside the lance head.
  • a disconnectable adapter which is secured inside the lance head.
  • the protective pipe should overlap and seal the adapter like a telescopic sleeve.
  • one of the set ups of the invention provides for there being coaxial fittings at the cooling chambers of the lance heads for continuing coaxial inlet and outlet cool water channels. These fittings may then be welded on to the continuing coaxial inlet and outlet channels.
  • the oxygen blowing lance shown in Figure 1 is made up of a shafted lance body 1 and a lance head 2 which is welded onto the body.
  • the lowest part of the lance head 2 is made from copper.
  • Another reason for making the decision to use copper as the material for the lance head 2 is the good thermal conductivity of copper which makes it possible to effectively cool the lance head 2 with cooling water during blowing.
  • the lance head 2 comprises a nozzle body 2a, made of copper, with a crown of a total of six evenly spaced nozzles 3 and 4 in a circle and simply directed outwards, cooling chambers 5, 6, 7, 8, 9 and 10 as well as a central, axial strut 11.
  • Coaxial, tubular fittings 2b, 2c, and 2d, are connected to the outermost cooling chambers which together with the nozzle body 2a form an interchangeable modular unit.
  • the lance body 1 consists of three coaxial tubes 12, 13 and 14 made from steel. Together with the incoming/feed connection piece 12a the inside tube 12 forms a central supply line 15 for the oxygen to be supplied to the blowing nozzles 3 and 4.
  • a close sliding fit for 12a is provided in the upper area between the inside pipe 12 on the inside and the middle and outside tubes 13 and 14 which together form a single unit, on the outside. This close sliding fit at 12a serves for adjustment of the relative linear expansions between the tubes 12, 13 and 14 and the assembly of the lance body 2.
  • Conduits 16 and 17 are developed between the inside tube 12 and the outside tube 14 as well as tube 13 that lies in between them. Of these conduits, the inside conduit 16 is the supply conduit and the outside conduit 17 forms the outlet conduit for the cooling water that is to be forced through the channels under high pressure. The cooling water is brought in and let out via laterally placed fittings 18 and 19.
  • thermoelectric couple 21 In the central strut 11 of the nozzle body 2a there is a bore hole 20 into which an engaging and disengaging, rod-shaped thermoelectric couple is plugged in as the temperature probe 21.
  • the temperature probe 21 is centered by an adapter 22 and held with its end in contact with the floor of the bore hole 20, which is recessed just a few millimeters opposite the front end 11a of the nozzle body.
  • the adapter 22 is fastened with screws to the inside of the nozzle body.
  • the temperature probe 21 is movable and stored in the adapter 22 and forced towards the floor of the bore hole 20 by a spring 23 that is supported on a regulating screw 25 screwed into the adapter 22.
  • the lower end 27a of the protective pipe and the upper end 22a of the adapter 22 form a sealed, telescopic sleeve which makes it easier to switch out the lance head 2 and allows for various linear expansions of the approximately 20 meter long pipes 27 and 12.
  • the protective pipe 27 is kept centered at several axially distributed places on the inside walling of the inside tube 12 using springed, radial supporting elements 29 which allow for relative axial motion of the protective pipe 27 compared with the tube 12.
  • the protective pipe 27 is attached directly to the tube 12 only at the top with radial struts 30 and scaled free from tube 12 and open to the atmosphere.
  • the regulating screw 25 is first screwed into the adapter 22 with the rod-shaped temperature probe 21.
  • the adapter 22 is already preassembled on the inside of the nozzle body 2a so that the temperature probe 21 sits securely in the bore hole 20 after the regulating screw 25 is screwed in.
  • the nozzle body 2a is then connected with its fitting 2d to the inside tube 12 on the point of separation 31 and welded on. In this way the middle and the outside tubes 13 and 14 are pushed back on to the inside tube 12 and the middle tube 13 respectively.
  • the special advantages of the invention are that the temperature is monitored at the places of an oxygen blowing lance which are critical with regard to a release of water, that is the front end 11a of the nozzle body that lies opposite the sensor focal point. In this way counteractive steps can be taken with as little delay as possible when there is the threat of a rupture, whether it be due to the mechanical wear and tear of the remaining wall thickness of the cooling chamber, or due to weakening of the chamber walls because of high thermal peaks when there is insufficient cooling during dismantling. Because of the practically immediate determination of the actual temperature it is also possible to consider the march of temperature over time when choosing what measures to take, using which a rupture can be counteracted.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Claims (13)

  1. Eine Sauerstoffblaslanze, die Folgendes beinhaltet:
    einen Lanzenkörper, der einen Sauerstoffkanal und einen Kühlwassereinlass- und -auslasskanal umfasst, die den Sauerstoffkanal umgeben;
    einen Lanzenkopf, der mit dem Lanzenkörper verbunden ist und einen Düsenkörper beinhaltet, wobei der Düsenkörper eine zentrale Strebe, die ein Bohrloch aufweist, eine Vielzahl von Düsen, die um die zentrale Strebe angeordnet sind, und eine Vielzahl von Kühlkammem, die um die zentrale Strebe angeordnet sind, umfasst, wobei die Vielzahl von Düsen in Fluidverbindung mit dem Sauerstoffkanal zum Ablassen von Sauerstoff aus dem Sauerstoffkanal auf ein Metallbad in einem Konverterbehälter steht, und wobei die Vielzahl von Kühlkammern in Fluidverbindung mit den Kühlwassereinlass- und -auslasskanälen steht;
    eine Temperatursonde, die in dem Bohrloch empfangen wird, um die Temperatur des Lanzenkopfs zu überwachen; und
    Signalleitungen, die mit der Temperatursonde verbunden sind, um Signale von der Temperatursonde zu übermitteln, wobei die Betätigung der Blaslanze in Reaktion auf die Signale reguliert wird.
  2. Sauerstoffblaslanze gemäß Anspruch 1, die ferner ein Schutzrohr beinhaltet, das die Signalleitungen umgibt.
  3. Sauerstoffblaslanze gemäß Anspruch 2, wobei das Schutzrohr innerhalb des Sauerstoffkanals angeordnet ist.
  4. Sauerstoffblaslanze gemäß Anspruch 3, die ferner radial angeordnete Stützmittel beinhaltet, um das Schutzrohr von dem Sauerstoffkanal mit Abstand anzuordnen.
  5. Sauerstoffblaslanze gemäß Anspruch 4, wobei die Stützmittel elastisch sind.
  6. Sauerstoffblaslanze gemäß Anspruch 1, wobei das Bohrloch einen Boden aufweist, und wobei die Sauerstoffblaslanze ferner Mittel zum Zwingen der Temperatursonde in Richtung des Bohrlochbodens beinhaltet.
  7. Sauerstoffblaslanze gemäß Anspruch 6, wobei die Zwingmittel elastische Mittel beinhalten.
  8. Sauerstoffblaslanze gemäß Anspruch 7, wobei das elastische Mittel eine Feder ist.
  9. Sauerstoffblaslanze gemäß Anspruch 7, wobei die Zwingmittel ferner eine Schraube beinhalten, um die durch das elastische Mittel auf die Temperatursonde ausgeübte Kraft zu regulieren.
  10. Sauerstoffblaslanze gemäß Anspruch 9, die ferner einen an dem Düsenkörper befestigten Adapter beinhaltet, wobei das elastische Mittel in dem Adapter empfangen wird, und wobei die Schraube mit dem Adapter gewindet verbunden ist.
  11. Sauerstoffblaslanze gemäß Anspruch 10, die ferner Mittel zum lösbaren Befestigen des Adapters an dem Düsenkörper beinhaltet.
  12. Sauerstoffblaslanze gemäß Anspruch 10, die ferner ein Schutzrohr beinhaltet, das die Signalleitungen umgibt.
  13. Sauerstoffblaslanze gemäß Anspruch 12, wobei das Schutzrohr und der Adapter eine versiegelte, teleskopische Hülse bilden.
EP00972070A 1999-10-06 2000-10-06 Verfahren zur metallurgischen behandlung von flüssigem stahl mit sauerstoff in einem aufblaskonverter Expired - Lifetime EP1315841B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19948187 1999-10-06
DE19948187A DE19948187C2 (de) 1999-10-06 1999-10-06 Verfahren zur metallurgischen Behandlung einer Stahlschmelze in einem Konverter mit auf die Stahlschmelze aufgeblasenem Sauerstoff und Sauerstoffaufblaslanze
PCT/US2000/028077 WO2002031212A1 (en) 1999-10-06 2000-10-06 Process for the metallurgical treatment of molten steel in a converter with oxygen top blown

Publications (3)

Publication Number Publication Date
EP1315841A1 EP1315841A1 (de) 2003-06-04
EP1315841A4 EP1315841A4 (de) 2004-06-30
EP1315841B1 true EP1315841B1 (de) 2005-04-27

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ID=7924730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00972070A Expired - Lifetime EP1315841B1 (de) 1999-10-06 2000-10-06 Verfahren zur metallurgischen behandlung von flüssigem stahl mit sauerstoff in einem aufblaskonverter

Country Status (6)

Country Link
EP (1) EP1315841B1 (de)
AT (1) ATE294244T1 (de)
AU (1) AU2001210785A1 (de)
CA (1) CA2388397A1 (de)
DE (2) DE19948187C2 (de)
WO (1) WO2002031212A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10253463A1 (de) * 2002-11-16 2004-06-03 Gecon Engineering Gmbh Verfahren und Vorrichtung zur Kühlung von Blaslanzen
US7402274B2 (en) * 2005-12-07 2008-07-22 Berry Metal Company Metal making lance slag detection system
DE102010001669A1 (de) * 2010-02-08 2011-08-11 Siemens Aktiengesellschaft, 80333 Vorrichtung zur Erfassung mindestens einer Messgröße an einem Ofen, sowie Ofen
UA113614C2 (xx) * 2013-02-14 2017-02-27 Спосіб експлуатації кисневої продувальної фурми в металургійній ємності і вимірювальна система для визначення використовуваних при цьому сигналів вимірювань
CA2947673C (en) * 2014-03-14 2020-06-23 Berry Metal Company Metal making lance with spring-loaded thermocouple or camera in lance tip
ES2900126T3 (es) * 2018-08-17 2022-03-15 Berry Metal Co Método y aparato para controlar la operación y la posición de un conjunto de lanza y tobera en un baño de metal fundido en un recipiente

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1433461B2 (de) * 1964-12-30 1972-02-10 Fried. Krupp Gmbh, 4300 Essen Verfahren und vorrichtung zur ueberwachung und steuerung des reaktionsablaufes beim sauerstoffaufblasverfahren
US3574598A (en) * 1967-08-18 1971-04-13 Bethlehem Steel Corp Method for controlling basic oxygen steelmaking
US4106756A (en) * 1976-11-01 1978-08-15 Pullman Berry Company Oxygen lance and sensing adapter arrangement
US4474361A (en) * 1980-07-30 1984-10-02 Nippon Steel Corporation Oxygen-blown steelmaking furnace
US4732607A (en) * 1985-11-26 1988-03-22 Sumitomo Metal Industries, Ltd. Method of controlling the stirring strength and flow rate of a jet of gas blown through a lance onto a molten metal surface
DE3543836A1 (de) * 1985-12-12 1987-06-19 Clemens Karl Heinz Zwillingsblaslanzenanlage fuer metallurgische behandlungen mit integrierter messlanzenanlage
JPS62278217A (ja) * 1986-05-27 1987-12-03 Nippon Steel Corp スラグレベル制御用熱伝対埋設ランス
JPH03197612A (ja) * 1989-12-25 1991-08-29 Kawasaki Steel Corp 溶融金属の精錬方法

Also Published As

Publication number Publication date
ATE294244T1 (de) 2005-05-15
DE19948187C2 (de) 2001-08-09
EP1315841A1 (de) 2003-06-04
DE60019815D1 (de) 2005-06-02
DE19948187A1 (de) 2001-05-10
AU2001210785A1 (en) 2002-04-22
WO2002031212A1 (en) 2002-04-18
CA2388397A1 (en) 2002-04-18
EP1315841A4 (de) 2004-06-30

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