EP0792378A1 - Procede et dispositif pour le soufflage de gaz contenant de l'oxygene, avec ou sans matieres solides, sur une masse de metal en fusion se trouvant dans un recipient metallurgique, notamment dans un recipient rh - Google Patents

Procede et dispositif pour le soufflage de gaz contenant de l'oxygene, avec ou sans matieres solides, sur une masse de metal en fusion se trouvant dans un recipient metallurgique, notamment dans un recipient rh

Info

Publication number
EP0792378A1
EP0792378A1 EP95935838A EP95935838A EP0792378A1 EP 0792378 A1 EP0792378 A1 EP 0792378A1 EP 95935838 A EP95935838 A EP 95935838A EP 95935838 A EP95935838 A EP 95935838A EP 0792378 A1 EP0792378 A1 EP 0792378A1
Authority
EP
European Patent Office
Prior art keywords
oxygen
lance
gas
mouth
shaped
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
EP95935838A
Other languages
German (de)
English (en)
Other versions
EP0792378B1 (fr
Inventor
Horst-Dieter Schoeler
Ulrich Meyer
Anatoly Sizov
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0792378A1 publication Critical patent/EP0792378A1/fr
Application granted granted Critical
Publication of EP0792378B1 publication Critical patent/EP0792378B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C21C7/10—Handling in a vacuum

Definitions

  • the invention relates to a method for inflating oxygen-containing gas with and without solids onto a molten metal located in a metallurgical vessel, a method for generating a burning flame and the corresponding devices according to the preambles of claims 1, 2, 6, 9, 13 and 18. Methods and devices are known with which oxygen is blown onto a molten metal and with which the melt can be heated by adding fuel.
  • top-blow lance is known from EP 0 584 814 A2, the lance mouth of which is lavai-shaped and has bores through which a combustible medium can be injected into the main flow of the lance.
  • the main stream consisting of oxygen or oxygen-containing gas, leaves the lance nozzle at supersonic speed, but under conventional flow conditions.
  • the lance known from this document has a water-cooled jacket. A device for injecting solids is not provided.
  • DE 2026 780 C2 discloses an addition funnel which is inserted in the lid of the vessel and through which solids - here scale as oxidizing agent - can be fed to the melt.
  • DE 29 18 213 C2 discloses a method and a device for the metallurgical treatment of molten metals, in which a multi-phase treatment in a single device is made possible in which, while maintaining the end cap, at least one first device, here an electrode, guided through the cover, is replaced by a second device, here a fresh lance.
  • the invention has set itself the goal of creating a method and a suitable lance as a unitary component, in which, without structural alteration measures using simple constructional means, various different process steps in the treatment of metal melts located in a metallurgical vessel while increasing the introduction rates of the individual media are feasible.
  • the invention achieves this goal through the characteristic features of
  • a multi-function lance in which the methods of inflating oxygen with and without solids and generating a flame are possible independently of one another.
  • the individual supply lines are switched accordingly; when oxygen is inflated with solids, only the solids guide tube is moved deeper into the lance.
  • maximum input rates are possible by influencing the media flow behavior in particular.
  • the gas stream is excited to oscillate in a particularly simple manner, in such a way that the gas volumes in the form of longitudinal waves hit the surface of the liquid melt in a particularly soft form in spite of the large amounts.
  • the method and the device are suitable for the treatment of molten metals under atmospheric pressure as well as under vacuum.
  • the pulse frequency of the oxygen is between 60 and 900 heart, at a pressure of 3 to 11 bar.
  • the pulse frequency of the fuel gas has a comparable size, the pressure being slightly above that of the main gas.
  • Natural gas, coke gas and comparable gases are used as fuel gas.
  • the fuel gas is injected into the oxygen stream in small doses through a variety of nozzles.
  • the individual nozzles Depending on the distance to the critical diameter of the lavai-shaped lance mouth, the individual nozzles have a predetermined angle that takes into account the current gas velocity and the current type of vibration.
  • the individual nozzles are themselves designed as generators, so that the fuel gas is excited to oscillate with simple means immediately before being mixed into the main stream.
  • the fuel gas can be supplied via an annular gap, which is limited by the fuel gas supply pipe and the oxygen guide pipe, or via a separate fuel supply line.
  • the solids supply lance When inflating oxygen and solids at the same time, the solids supply lance is positioned with its mouth behind the critical diameter in the direction of flow.
  • the granular or dusty solids are transported by a conveying gas.
  • This gas-solid mixture is entrained by the flowing oxygen flow at the mouth of the solid material delivery lance.
  • baffle ring which stimulates the main flow to oscillate, downstream in the form of a lavai-shaped lance mouth, and thus to avoid undesired obstructions after the orifice.
  • Figure 2 shows the mouth area of the solid fuel supply and Figure 3 scheme of the fuel nozzle.
  • FIG. 1 shows a lance, which is composed of a water guide tube 21 and an oxygen guide tube 11, which is connected at the foot end to this and is surrounded by a water separating screen 22, which in turn is connected at the foot end to the water guide tube 21.
  • a fuel gas guide tube 31 is provided that surrounds the oxygen guide tube 11 and allows a gap-shaped free space for the supply of fuel gas.
  • a tube is shown as a fuel gas supply line 32, which is felt directly from the foot end to the head end of the lance.
  • the individual media water W, fuel gas B, solid F, feed gas G and oxygen S are supplied to the lance via the individual nozzles, namely gas supply 12, water supply 23, water discharge 24, fuel gas supply 33 and solid supply 42.
  • a displacement tube 41 is arranged in the center of the oxygen guide tube 11 and can be used as a solid feed tube at a predetermined penetration depth into the oxygen guide tube 11.
  • a baffle ring 13 is fastened in the oxygen guide tube 11 at a distance Ig in the flow direction in front of the critical diameter of the lavai-shaped lance mouth.
  • the impact ring 13 has a free passage D_.
  • the impact ring 13 can have a lavai-shaped configuration 15 on its downstream side.
  • the oxygen guide tube 11 has a constriction 14, the critical diameter of the lavai-shaped lance mouth. This critical diameter 14 can be varied by adjusting elements 16.
  • the pipe 41 opens in the flow direction in front of the impact ring 13 at a distance Ip.
  • this tube When using the tube 41 as a solids feed tube, this tube is moved in such a way that it is due to the free space of the baffle plate 13 and the constriction of the critical diameter 14 protrudes and has a distance I «downstream of the constriction 14.
  • nozzles 34 are provided which have an expansion stage 35.
  • the nozzles 34 have an angle ⁇ to a respective plane perpendicular to the lance center axis I, which becomes flatter (smaller) the further the individual nozzle 34 is from the critical diameter 14.
  • the first nozzle 34 is at least at a distance Irj from the critical diameter 14.
  • the individual arrows show the direction of flow of the medium.
  • FIG. 2 shows the mouth area of the solids supply pipe 41 with a star-shaped flare. Due to the special shape, the solid feed pipe 41 has a constant cross section A, the circumferential line of the deformed part Uv being longer than the forming line of an undeformed pipe UR.
  • FIG. 3 shows a nozzle 34 with an extension stage 35 on the output side.
  • the dimensions length of the nozzle L 1, length of generator Lg, diameter of nozzle Dp and diameter of generator DQ are also shown.

Landscapes

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

Abstract

L'invention concerne un procédé pour le soufflage de gaz à teneur en oxygène, avec ou sans matières solides, sur une masse de métal en fusion se trouvant dans un récipient métallurgique, notamment dans un récipient RH, un procédé pour la production d'une flamme de combustion, ainsi que les dispositifs correspondants. L'invention a pour but de fournir un procédé et une lance appropriée permettant, sans modifier les structures et en ayant recours à des moyens de construction simples, d'effectuer différentes étapes du procédé lors du traitement de masses de métal en fusion, en particulier lors du traitement sous vide de l'acier dans un récipient RH, avec augmentation des vitesses d'introduction des différents milieux. L'invention a, en conséquence, pour objet une lance multifonctionnelle, au moyen de laquelle l'ensemble des processus de soufflage d'oxygène, avec ou sans matières solides, et la production d'une flamme de combustion sont possibles, indépendamment l'un de l'autre. Les conduits d'alimentation individuels sont connectés de façon appropriée pour les étapes respectives du procédé. Dans le procédé pour le soufflage de gaz contenant de l'oxygène, le courant gazeux est mis en vibration de façon particulièrement simple.
EP95935838A 1994-11-18 1995-10-27 Procede et dispositif pour le soufflage de gaz contenant de l'oxygene, avec ou sans matieres solides, sur une masse de metal en fusion se trouvant dans un recipient metallurgique, notamment dans un recipient rh Expired - Lifetime EP0792378B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4442362A DE4442362C1 (de) 1994-11-18 1994-11-18 Verfahren und Vorrichtung zum Behandeln von einer in einem metallurgischen Gefäß befindlichen Metallschmelze
DE4442362 1994-11-18
PCT/DE1995/001521 WO1996016190A1 (fr) 1994-11-18 1995-10-27 Procede et dispositif pour le soufflage de gaz contenant de l'oxygene, avec ou sans matieres solides, sur une masse de metal en fusion se trouvant dans un recipient metallurgique, notamment dans un recipient rh

Publications (2)

Publication Number Publication Date
EP0792378A1 true EP0792378A1 (fr) 1997-09-03
EP0792378B1 EP0792378B1 (fr) 1999-09-22

Family

ID=6534382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95935838A Expired - Lifetime EP0792378B1 (fr) 1994-11-18 1995-10-27 Procede et dispositif pour le soufflage de gaz contenant de l'oxygene, avec ou sans matieres solides, sur une masse de metal en fusion se trouvant dans un recipient metallurgique, notamment dans un recipient rh

Country Status (9)

Country Link
US (1) US5931985A (fr)
EP (1) EP0792378B1 (fr)
JP (1) JPH10508907A (fr)
AU (1) AU3800795A (fr)
DE (2) DE4442362C1 (fr)
RU (1) RU2135604C1 (fr)
TW (1) TW314555B (fr)
WO (1) WO1996016190A1 (fr)
ZA (1) ZA959533B (fr)

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DE19680993D2 (de) * 1995-11-17 1999-01-28 Mannesmann Ag Verfahren und Vorrichtung zur Entkohlung von Stahlschmelzen
ZA978026B (en) * 1996-09-17 1998-03-03 Holderbank Financ Glarus Process for working up combustion residues.
KR100270113B1 (ko) * 1996-10-08 2000-10-16 이구택 극저탄소강의 용강 제조장치
DE19755876C2 (de) * 1997-12-04 2000-02-24 Mannesmann Ag Blaslanze zum Behandeln von metallischen Schmelzen und Verfahren zum Einblasen von Gasen
DE19817590C1 (de) * 1998-04-20 1999-03-18 Technometal Ges Fuer Metalltec Variabel einsetzbare Kombilanze
TR200100606T2 (tr) * 1998-08-28 2001-10-22 Voest-Alpine Industrieanlagenbau Gmbh Bir metal eriyiğinin hazırlanması için yöntem ve karşılık gelen çok fonksiyonlu püskürtücü
AT407398B (de) * 1998-08-28 2001-02-26 Voest Alpine Ind Anlagen Verfahren zum herstellen einer metallschmelze
JP3666301B2 (ja) * 1999-05-21 2005-06-29 Ｊｆｅスチール株式会社 真空脱ガス槽用複合ランス及びその使用方法
US6261338B1 (en) * 1999-10-12 2001-07-17 Praxair Technology, Inc. Gas and powder delivery system and method of use
US6866504B2 (en) * 2003-08-01 2005-03-15 Mg Industries Burner with high-efficiency atomization
US7297180B2 (en) * 2005-07-13 2007-11-20 Praxair Technology, Inc. Method for operating a vacuum vessel with a coherent jet
DE102006034014A1 (de) * 2006-02-23 2007-10-31 Egon Evertz Kg (Gmbh & Co.) Flämmbrenner und Verfahren zum Brennflämmen einer metallischen Oberfläche
DE202006008760U1 (de) * 2006-06-02 2007-10-04 Egon Evertz Kg (Gmbh & Co.) Gasbrennerdüse
US7452401B2 (en) * 2006-06-28 2008-11-18 Praxair Technology, Inc. Oxygen injection method
BRPI0720287B1 (pt) * 2006-12-15 2017-05-09 Praxair Technology Inc método de injetar gás inerte no banho localizado dentro de um forno metalúrgico tendo uma atmosfera de forno aquecida.
US20110127701A1 (en) * 2009-11-30 2011-06-02 Grant Michael G K Dynamic control of lance utilizing co-flow fluidic techniques
US8377372B2 (en) 2009-11-30 2013-02-19 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dynamic lances utilizing fluidic techniques
US8323558B2 (en) * 2009-11-30 2012-12-04 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dynamic control of lance utilizing counterflow fluidic techniques
RU2448166C1 (ru) * 2011-04-13 2012-04-20 Игорь Михайлович Шатохин Многофункциональная фурма для металлургического вакууматора
BRPI1102228A2 (pt) * 2011-05-17 2013-06-25 Magnesita Refratarios S A lanca para injecao de topo em vasos metalurgicos e metodo para fabricacao dessa lanca
EP2581462B1 (fr) * 2011-10-10 2016-03-02 Primetals Technologies Germany GmbH Lance de soufflage dotée d'un allumage direct à l'aide d'une lance d'allumage rétractable
JP6347200B2 (ja) * 2014-10-10 2018-06-27 新日鐵住金株式会社 Ｒｈ真空脱ガス設備の上吹きランス装置
BR102015003522A2 (pt) * 2015-02-19 2016-08-23 Lumar Metals Ltda conjunto de lança de sopro para fabricação e refino de metais
RU2601848C1 (ru) * 2015-04-21 2016-11-10 Общество с ограниченной ответственностью научно-техническое предприятие "Аконт" (ООО НТП "Аконт") Устройство для интенсификации плавки в дуговой сталеплавильной печи
RU2660720C2 (ru) * 2016-05-19 2018-07-09 Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН) Способ циркуляционного вакуумирования металлического расплава

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Also Published As

Publication number Publication date
TW314555B (fr) 1997-09-01
ZA959533B (en) 1996-05-27
WO1996016190A1 (fr) 1996-05-30
DE59506914D1 (de) 1999-10-28
DE4442362C1 (de) 1996-04-18
US5931985A (en) 1999-08-03
AU3800795A (en) 1996-06-17
RU2135604C1 (ru) 1999-08-27
EP0792378B1 (fr) 1999-09-22
JPH10508907A (ja) 1998-09-02

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