EP0919634A1 - Lance de soufflage avec gaine réfractaire refroidie par passage d'un gaz - Google Patents

Lance de soufflage avec gaine réfractaire refroidie par passage d'un gaz Download PDF

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Publication number
EP0919634A1
EP0919634A1 EP98122352A EP98122352A EP0919634A1 EP 0919634 A1 EP0919634 A1 EP 0919634A1 EP 98122352 A EP98122352 A EP 98122352A EP 98122352 A EP98122352 A EP 98122352A EP 0919634 A1 EP0919634 A1 EP 0919634A1
Authority
EP
European Patent Office
Prior art keywords
gas
blow lance
gas passage
passage channels
refractory
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Withdrawn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
EP98122352A
Other languages
German (de)
English (en)
Inventor
Frank Stilger
Günter Langner
Michael Specht
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
Priority claimed from DE19807846A external-priority patent/DE19807846A1/de
Application filed by Plibrico Co GmbH filed Critical Plibrico Co GmbH
Publication of EP0919634A1 publication Critical patent/EP0919634A1/fr
Withdrawn legal-status Critical Current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
    • C21C5/4646—Cooling arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • 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 blowing lance for introducing gaseous and / or solid treatment media or additives in molten metal, with an inner support tube and one the support tube circumferentially surrounding refractory casing.
  • blow lances as for example from DE-PS 3744715 are known, are used in blowing technology for blowing of treatment gases or carrier gases with which solids are used in liquid metal melts.
  • the lances commonly used today are divided into rinsing lances, the gasification of inert purge gases such as argon or also use nitrogen to embroider melts, in oxygen lances, which to supply oxygen during the fresh process or Temperature increase of the melt can be used in solid lances, where with granular inert carrier gases or powdered reaction or additives such as lime or Silicon are blown in and finally the so-called Pig iron lances, in which the pig iron by the supply of Calcium or magnesium oxide is desulfurized.
  • inert purge gases such as argon or also use nitrogen to embroider melts
  • oxygen lances which to supply oxygen during the fresh process or Temperature increase of the melt
  • Solid lances where with granular inert carrier gases or powdered reaction or additives such as lime or Silicon are blown in and finally the so-called Pig iron lances, in which the pig iron by the supply of Calcium or magnesium oxide is desulfurized.
  • blowing lances are held above the pan on holding devices attached and the support tube is attached with the appropriate Feed lines connected.
  • the actual injection tube also called the carrier tube
  • a fire-resistant jacket which, for. B. may consist of chamotte, corundum, mullite, andalusite, bauxite, etc.
  • This refractory sheathing is usually connected to the carrier tube with the aid of anchor elements, which, in addition to mechanically clamping the refractory material to the carrier tube, also have the task of dissipating heat from the refractory layer into the carrier tube, in order in this way to utilize the cooling effect of the gases to be injected.
  • the durability of the known blowing lances is nevertheless essentially limited by premature wear of the refractory carrier tube casing in the slag area of the melt. This is due to an increased chemical attack by the aggressive slag, the increased bath temperature in the upper melt area and the increased bath movement in the surface area.
  • the invention has for its object a generic To create blowing lance, in which the leading wear in Slag area is reduced.
  • the inventive design of the blowing lance is first the refractory coating in the slag area is extraordinary effectively cooled so that the thermal and chemical Attack of the slag is initially significantly reduced becomes.
  • An inert gas such as argon is preferably used for this purpose or nitrogen is used.
  • gas passage channels in the refractory casing can be used in the production of gas purging stones Techniques are used so that the refractory material have a directional or non-directional porosity can.
  • a gas supply channel concentrically surrounding the carrier tube provided by a special gas connection is connected to the cooling gas.
  • Gas can also go directly through the carrier tube into the additional Gas channels are blown.
  • the gas escaping in the area of the slag zone ensures not only for excellent cooling of the refractory material, but at the same time forms a concentric blow lance surrounding gas cushion, which is largely direct Prevent contact between slag and refractory material can.
  • the one to be injected The amount of gas can be relatively small, since this is through the gas passage channels escaping gas due to the comparatively high temperature in the slag area expands considerably.
  • Gas passage channels segment-like in one another Areas of the refractory jacket arranged.
  • the Gas passage channels directed and inclined to Longitudinal center axis of the lance, so that when it is inclined upwards Channels a flow bead from the molten metal can be generated, the refractory casing ring surrounds, and direct contact between the slag and the refractory coat prevented.
  • the drawing shows a schematic section through a Blow lance 1, which essentially consists of a carrier tube 2, that of a refractory casing 3 concentric is surrounded.
  • a gas supply channel 4 provided, which surrounds the support tube 2 concentrically and pressurized with compressed gas by means of a gas connecting piece 5 can be.
  • gas passage channels extending radially outwards 7 are provided, which are connected to the gas supply channel 4 and on the outside 8 of the refractory casing 3 open.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
EP98122352A 1997-12-01 1998-11-26 Lance de soufflage avec gaine réfractaire refroidie par passage d'un gaz Withdrawn EP0919634A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19753021 1997-12-01
DE19753021 1997-12-01
DE19807846 1998-02-25
DE19807846A DE19807846A1 (de) 1997-12-01 1998-02-25 Blaslanze

Publications (1)

Publication Number Publication Date
EP0919634A1 true EP0919634A1 (fr) 1999-06-02

Family

ID=26042023

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98122352A Withdrawn EP0919634A1 (fr) 1997-12-01 1998-11-26 Lance de soufflage avec gaine réfractaire refroidie par passage d'un gaz

Country Status (1)

Country Link
EP (1) EP0919634A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010076214A1 (fr) * 2008-12-16 2010-07-08 Siemens Vai Metals Technologies Gmbh & Co Lance à oxygène refroidie par gaz protecteur
CN107014207A (zh) * 2017-05-19 2017-08-04 中国恩菲工程技术有限公司 氧枪砖
CN114350884A (zh) * 2022-01-07 2022-04-15 鞍钢股份有限公司 一种复吹转炉的底吹元件及供气方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2834829A1 (de) * 1977-08-24 1979-03-08 Stein Refractories Injektor-lanze
DE3246937A1 (de) * 1981-12-31 1983-07-07 GR-Stein Refractories Ltd., Sheffield Feuerfeste formteile und verfahren zu ihrer herstellung
DE3628185A1 (de) * 1986-08-20 1988-02-25 Plibrico Co Gmbh Tauchlanze
EP0339174A1 (fr) * 1988-04-28 1989-11-02 RECHERCHES ET DEVELOPPEMENTS DESAAR, société anonyme Lance d'injection ou de soufflage avec chambre de refroidissement
US5443572A (en) * 1993-12-03 1995-08-22 Molten Metal Technology, Inc. Apparatus and method for submerged injection of a feed composition into a molten metal bath

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2834829A1 (de) * 1977-08-24 1979-03-08 Stein Refractories Injektor-lanze
DE3246937A1 (de) * 1981-12-31 1983-07-07 GR-Stein Refractories Ltd., Sheffield Feuerfeste formteile und verfahren zu ihrer herstellung
DE3628185A1 (de) * 1986-08-20 1988-02-25 Plibrico Co Gmbh Tauchlanze
EP0339174A1 (fr) * 1988-04-28 1989-11-02 RECHERCHES ET DEVELOPPEMENTS DESAAR, société anonyme Lance d'injection ou de soufflage avec chambre de refroidissement
US5443572A (en) * 1993-12-03 1995-08-22 Molten Metal Technology, Inc. Apparatus and method for submerged injection of a feed composition into a molten metal bath

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010076214A1 (fr) * 2008-12-16 2010-07-08 Siemens Vai Metals Technologies Gmbh & Co Lance à oxygène refroidie par gaz protecteur
CN107014207A (zh) * 2017-05-19 2017-08-04 中国恩菲工程技术有限公司 氧枪砖
CN114350884A (zh) * 2022-01-07 2022-04-15 鞍钢股份有限公司 一种复吹转炉的底吹元件及供气方法

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