EP0423098A1 - Multi-tube blowing lance - Google Patents

Multi-tube blowing lance Download PDF

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Publication number
EP0423098A1
EP0423098A1 EP90870168A EP90870168A EP0423098A1 EP 0423098 A1 EP0423098 A1 EP 0423098A1 EP 90870168 A EP90870168 A EP 90870168A EP 90870168 A EP90870168 A EP 90870168A EP 0423098 A1 EP0423098 A1 EP 0423098A1
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EP
European Patent Office
Prior art keywords
injection tubes
lance
sheath
several
tube
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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.)
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EP90870168A
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German (de)
French (fr)
Inventor
René Desaar
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Recherches Et Developpements Desaar SA
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Recherches Et Developpements Desaar SA
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Publication of EP0423098A1 publication Critical patent/EP0423098A1/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
    • 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 present invention relates to a lance intended to inject oxygen and / or an inert gas into liquid steel.
  • a known blowing lance consists of a metal tube surrounded by a sheath of refractory material over at least part of its length.
  • the tube In a lance intended to blow oxygen, the tube is made of copper; in a lance intended to blow an inert gas, the tube is made of steel.
  • the first type of lance is used to heat the steel in the ladle in order to reduce the temperature of the liquid steel to the value strictly imposed for casting.
  • a lance of the second type is used to homogenize the steel in the ladle.
  • known lances have only one tube.
  • the present invention relates to a multi-tube lance, and in particular a multi-tube mixed lance, that is to say a lance which can be used both for blowing oxygen and for blowing an inert gas. .
  • the invention provides a remarkable blowing lance in that it comprises a metal supply tube which opens into a dis tributor from which several injection tubes emerge arranged parallel and concentrically with respect to the longitudinal axis of the lance, the injection tubes being embedded in a sheath made of refractory material.
  • the dispenser has two chambers separated from each other: the first chamber communicates on the one hand with the aforementioned supply tube and on the other hand with several first injection tubes, the second chamber communicates with on the one hand with several second injection tubes and on the other hand with a second supply conduit for another gas, the first and second injection tubes being embedded in the sheath of refractory material.
  • the same lance can thus be used either to inject oxygen, for example, by means of the first injection tubes, or to inject inert gas, for example, by means of the second injection tubes.
  • the metal supply tube 11 (preferably stainless steel or copper) is provided at its upper end with a fixing device 12 for connection to the outlet 20 of a source of oxygen supply.
  • the fixing device 12 notably comprises an external thread 13 and a clamping spring 14.
  • the supply tube is attached to a distributor 15 comprising two chambers 16 and 17.
  • the distributor 15 is shown in perspective in FIG. 2.
  • the supply tube 11 opens into the chamber 16. This it also communicates with several injection tubes 18 fixed by means of the connections 19.
  • the injection tubes 18 are arranged parallel to each other around the longitudinal axis AA of the lance (see also FIG. 3).
  • the injection tubes 18 are embedded in the sheath 21 of refractory material. In it is preferably but not necessarily embedded a wire mesh 22 which surrounds all of the injection tubes 18. This mesh serves as reinforcing reinforcement while ensuring a homogeneous continuity of the refractory mass which crosses the meshes of the trellis.
  • the injection tubes 18 are held by tubular guides 28 fixed on the wall of the central tube 23.
  • the second chamber 17 communicates on the one hand with a supply conduit 24 provided with means 25, in this case a screw thread, for connection to a supply source of inert gas, for example argon.
  • the chamber 17 also communicates (see FIGS. 2 and 4) with several second injection tubes 26 fixed by means of the fittings 27.
  • the tubes 26 are embedded in the refractory sheath 21, and are arranged concentrically to the longitudinal axis of the lance (see Figure 5).
  • the injection tubes 18 and 26 open into the underside of the sheath 21.
  • the parts of the distributor 15 which are in contact with oxygen are preferably made of copper or stainless steel.
  • the injection tubes 18 are, for example, 10/8 mm copper tubes; the injection tubes 26 are for example 12/4 mm steel tubes.
  • the lance as described above can be used both for injecting oxygen in order to bring the liquid steel contained in a ladle back to the desired temperature, and for blowing an inert gas in order to homogenize the liquid steel.
  • the arrangement of several injection tubes in communication with each of the chambers 16 and 17 ensures a better dynamic effect within the bath of liquid steel.
  • FIG. 6 illustrates an alternative embodiment in a simple lance, that is to say a lance intended for blowing a single gas.
  • the supply tube 11 opens into a distributor 15 with a single chamber.
  • several injection tubes 18 emerge embedded in a sheath 21 of refractory material.
  • the arrangement of several injection tubes provides an excellent dynamic effect within the bath of liquid steel.
  • the material of which the injection tubes are made and their dimensions are adapted to the nature of the gas which the lance is supposed to convey.

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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

Lance destinée à insuffler de l'oxygène et/ou un gaz inerte dans de l'acier liquide. Un tube d'amenée mé­tallique (11), entouré d'une gaine réfractaire sur au moins une partie de sa longueur, débouche dans un distributeur (15) d'où partent plusieurs tubes d'in­jection (18) disposés parallèlement et concentrique­ment par rapport à l'axe longitudinal (A-A) de la lan­ce, ces tubes d'injection étant noyés dans la gaine (21) en matière réfractaire. De préférence, le distri­buteur (15) comporte deux chambres (16, 17) séparées l'une de l'autre, la première chambre (16) communiquant avec le tube d'amenée (11) pour un premier gaz et avec plu­sieurs premiers tubes d'injection (18), la seconde chambre (17) communiquant avec un second conduit d'amenée (24) pour un autre gaz et avec plusieurs seconds tubes d'injection (26).

Figure imgaf001
A lance intended to inject oxygen and / or an inert gas into liquid steel. A metal supply tube (11), surrounded by a refractory sheath over at least part of its length, opens into a distributor (15) from which several injection tubes (18) emerge arranged parallel and concentrically with respect to to the longitudinal axis (AA) of the lance, these injection tubes being embedded in the sheath (21) of refractory material. Preferably, the distributor (15) has two chambers (16, 17) separated from each other, the first chamber (16) communicating with the supply tube (11) for a first gas and with several first tubes injection (18), the second chamber (17) communicating with a second supply conduit (24) for another gas and with several second injection tubes (26).
Figure imgaf001

Description

La présente invention concerne une lance destinée à insuffler de l'oxygène et/ou un gaz inerte dans de l'acier liquide.The present invention relates to a lance intended to inject oxygen and / or an inert gas into liquid steel.

Une lance de soufflage connue est constituée d'un tube métallique entouré d'une gaine en matériau réfractai­re sur au moins une partie de sa longueur. Dans une lance destinée à souffler de l'oxygène, le tube est en cuivre; dans une lance destinée à souffler un gaz inerte, le tube est en acier. Il n'existe actuelle­ment aucune lance permettant d'être utilisée à la fois pour souffler de l'oxygène et pour souffler un gaz inerte, de sorte que, dans les aciéries, il est actu­ellement nécessaire de disposer des deux types de lance. Le premier type de lance sert en effet à réchauffer l'acier en poche afin de ramener la tempé­rature de l'acier liquide à la valeur strictement imposée pour la coulée. Une lance du second type est utilisée pour homogénéiser l'acier en poche. De plus, en général, les lances connues ne comportent qu'un seul tube.A known blowing lance consists of a metal tube surrounded by a sheath of refractory material over at least part of its length. In a lance intended to blow oxygen, the tube is made of copper; in a lance intended to blow an inert gas, the tube is made of steel. There is currently no lance capable of being used both for blowing oxygen and for blowing an inert gas, so that, in steelworks, it is currently necessary to have both types of lance. The first type of lance is used to heat the steel in the ladle in order to reduce the temperature of the liquid steel to the value strictly imposed for casting. A lance of the second type is used to homogenize the steel in the ladle. In addition, in general, known lances have only one tube.

La présente invention a pour objet une lance multi-­tubes, et notamment une lance mixte multi-tubes, c'est-à-dire une lance pouvant être utilisée aussi bien pour le soufflage d'oxygène que pour le soufflage d'un gaz inerte.The present invention relates to a multi-tube lance, and in particular a multi-tube mixed lance, that is to say a lance which can be used both for blowing oxygen and for blowing an inert gas. .

Pour atteindre cet objectif, l'invention propose une lance de soufflage remarquable en ce qu'elle comprend un tube d'amenée métallique qui débouche dans un dis­ tributeur d'où partent plusieurs tubes d'injection disposés parallèlement et concentriquement par rapport à l'axe longitudinal de la lance, les tubes d'injec­tion étant noyés dans une gaine en matière réfractai­re.To achieve this objective, the invention provides a remarkable blowing lance in that it comprises a metal supply tube which opens into a dis tributor from which several injection tubes emerge arranged parallel and concentrically with respect to the longitudinal axis of the lance, the injection tubes being embedded in a sheath made of refractory material.

De préférence, le distributeur comporte deux chambres séparées l'une de l'autre : la première chambre commu­nique d'une part avec le tube d'amenée précité et d'autre part avec plusieurs premiers tubes d'injec­tion, la seconde chambre communique d'une part avec plusieurs seconds tubes d'injection et d'autre part avec un second conduit d'amenée pour un autre gaz, les premiers et seconds tubes d'injection étant noyés dans la gaine en matière réfractaire. La même lance peut ainsi être utilisée soit pour insuffler de l'oxygène, par exemple, au moyen des premiers tubes d'injection, soit pour insuffler un gaz inerte, par exemple, au moyen des seconds tubes d'injection.Preferably, the dispenser has two chambers separated from each other: the first chamber communicates on the one hand with the aforementioned supply tube and on the other hand with several first injection tubes, the second chamber communicates with on the one hand with several second injection tubes and on the other hand with a second supply conduit for another gas, the first and second injection tubes being embedded in the sheath of refractory material. The same lance can thus be used either to inject oxygen, for example, by means of the first injection tubes, or to inject inert gas, for example, by means of the second injection tubes.

L'invention est exposée plus en détails dans ce qui suit à l'aide des dessins ci-annexés.

  • La figure 1 est une vue en coupe axiale d'une lance mixte selon l'invention.
  • La figure 2 est un écorché en perspective d'une partie de la figure 1.
  • La figure 3 est une coupe transversale suivant la ligne III-III de la figure 1.
  • La figure 4 est une coupe transversale suivant la ligne IV-IV de la figure 1.
  • La figure 5 est une coupe transversale suivant la ligne V-V de la figure 1.
  • La figure 6 est une vue en coupe axiale d'une partie d'une lance simple selon l'invention.
The invention is explained in more detail below with the aid of the attached drawings.
  • Figure 1 is an axial sectional view of a mixed lance according to the invention.
  • Figure 2 is a sectional perspective view of part of Figure 1.
  • Figure 3 is a cross section along line III-III of Figure 1.
  • Figure 4 is a cross section along the line IV-IV of Figure 1.
  • Figure 5 is a cross section along the line VV of Figure 1.
  • Figure 6 is an axial sectional view of part of a simple lance according to the invention.

Se reportant à la figure 1, le tube d'amenée métalli­que 11 (de préférence en acier inoxydable ou en cui­vre) est pourvu à son extrémité supérieure d'un dispo­sitif de fixation 12 pour le raccordement à la sortie 20 d'une source d'alimentation en oxygène. Le dispo­sitif de fixation 12 comprend notamment un filet exté­rieur 13 et un ressort de serrage 14.Referring to Figure 1, the metal supply tube 11 (preferably stainless steel or copper) is provided at its upper end with a fixing device 12 for connection to the outlet 20 of a source of oxygen supply. The fixing device 12 notably comprises an external thread 13 and a clamping spring 14.

A son extrémité inférieure, le tube d'amenée se trouve fixé à un distributeur 15 comprenant deux chambres 16 et 17. Le distributeur 15 est représenté en perspec­tive à la figure 2. Le tube d'amenée 11 débouche dans la chambre 16. Celle-ci communique également avec plusieurs tubes d'injection 18 fixés au moyen des rac­cords 19. Les tubes d'injection 18 sont disposés parallèlement entre eux autour de l'axe longitudinal A-A de la lance (voir également figure 3).At its lower end, the supply tube is attached to a distributor 15 comprising two chambers 16 and 17. The distributor 15 is shown in perspective in FIG. 2. The supply tube 11 opens into the chamber 16. This it also communicates with several injection tubes 18 fixed by means of the connections 19. The injection tubes 18 are arranged parallel to each other around the longitudinal axis AA of the lance (see also FIG. 3).

Les tubes d'injection 18 sont noyés dans la gaine 21 en matière réfractaire. Dans celle-ci est de préfé­rence mais non nécessairement noyé un treillis métal­lique 22 qui entoure l'ensemble des tubes d'injection 18. Ce treillis sert d'armature de renforcement tout en assurant une continuité homogène de la masse ré­fractaire qui traverse les mailles du treillis. Les tubes d'injection 18 sont maintenus par des guides tubulaires 28 fixés sur la paroi du tube central 23.The injection tubes 18 are embedded in the sheath 21 of refractory material. In it is preferably but not necessarily embedded a wire mesh 22 which surrounds all of the injection tubes 18. This mesh serves as reinforcing reinforcement while ensuring a homogeneous continuity of the refractory mass which crosses the meshes of the trellis. The injection tubes 18 are held by tubular guides 28 fixed on the wall of the central tube 23.

Revenant au distributeur 15, la seconde chambre 17 communique d'une part avec un conduit d'amenée 24 pourvu d'un moyen 25, en l'occurrence un filet de vis, pour le raccordement à une source d'alimentation en gaz inerte, par exemple en argon. La chambre 17 com­munique également (voir figures 2 et 4) avec plusieurs seconds tubes d'injection 26 fixés au moyen des rac­cords 27. Tout comme les tubes d'injection 18, les tubes 26 se trouvent noyés dans la gaine réfractaire 21, et sont disposés concentriquement à l'axe longitu­dinal de la lance (voir figure 5). Les tubes d'injec­tion 18 et 26 débouchent dans la face inférieure de la gaine 21. Les parties du distributeur 15 qui sont en contact avec l'oxygène sont de préférence en cuivre ou en acier inoxydable. Les tubes d'injection 18 sont par exemple des tubes de cuivre de 10/8 mm; les tubes d'injection 26 sont par exemple des tubes d'acier de 12/4 mm.Returning to the distributor 15, the second chamber 17 communicates on the one hand with a supply conduit 24 provided with means 25, in this case a screw thread, for connection to a supply source of inert gas, for example argon. The chamber 17 also communicates (see FIGS. 2 and 4) with several second injection tubes 26 fixed by means of the fittings 27. Like the injection tubes 18, the tubes 26 are embedded in the refractory sheath 21, and are arranged concentrically to the longitudinal axis of the lance (see Figure 5). The injection tubes 18 and 26 open into the underside of the sheath 21. The parts of the distributor 15 which are in contact with oxygen are preferably made of copper or stainless steel. The injection tubes 18 are, for example, 10/8 mm copper tubes; the injection tubes 26 are for example 12/4 mm steel tubes.

Grâce à son agencement, la lance telle que décrite ci-­dessus peut servir aussi bien pour insuffler de l'oxy­gène afin de remettre à température voulue, l'acier liquide contenu dans une poche de coulée, que pour insuffler un gaz inerte afin d'homogénéiser l'acier liquide. De plus, la disposition de plusieurs tubes d'injection en communication avec chacune des chambres 16 et 17 (ou éventuellement avec une des chambres seulement) assure un meilleur effet dynamique au sein du bain d'acier liquide.Thanks to its arrangement, the lance as described above can be used both for injecting oxygen in order to bring the liquid steel contained in a ladle back to the desired temperature, and for blowing an inert gas in order to homogenize the liquid steel. In addition, the arrangement of several injection tubes in communication with each of the chambers 16 and 17 (or possibly with only one of the chambers) ensures a better dynamic effect within the bath of liquid steel.

La figure 6 illustre une variante d'exécution dans une lance simple, c'est-à-dire une lance destinée au souf­flage d'un seul gaz. Le tube d'amenée 11 débouche dans un distributeur 15 à une seule chambre. De ce distributeur 15 partent plusieurs tubes d'injection 18 noyés dans une gaine 21 en matière réfractaire. Les tubes d'injection 18, dont le nombre peut être quel­conque, débouchent dans la face inférieure de la gaine 21. La disposition de plusieurs tubes d'injection assure un excellent effet dynamique au sein du bain d'acier liquide. La matière dont sont constitués les tubes d'injection et leurs dimensions sont adaptées à la nature du gaz que la lance est supposée véhiculer.FIG. 6 illustrates an alternative embodiment in a simple lance, that is to say a lance intended for blowing a single gas. The supply tube 11 opens into a distributor 15 with a single chamber. From this distributor 15, several injection tubes 18 emerge embedded in a sheath 21 of refractory material. The injection tubes 18, the number of which may be any, open into the underside of the sheath 21. The arrangement of several injection tubes provides an excellent dynamic effect within the bath of liquid steel. The material of which the injection tubes are made and their dimensions are adapted to the nature of the gas which the lance is supposed to convey.

Les modes de réalisation de l'invention décrits dans ce qui précède sont des exemples donnés à titre illus­tratif et l'invention n'est nullement limitée à ces exemples. Toute modification, toute variante et tout agencement équivalent doivent être considérés comme compris dans le cadre de l'invention.The embodiments of the invention described in the foregoing are examples given by way of illustration and the invention is in no way limited to these examples. Any modification, any variant and any equivalent arrangement must be considered to be within the scope of the invention.

Claims (3)

1. Lance de soufflage destinée à insuffler un gaz dans de l'acier liquide, comprenant un tube d'amenée métal­lique entouré d'une gaine en matière réfractaire sur au moins une partie de sa longueur, ledit tube métal­lique ayant une extrémité pourvue d'un dispositif de fixation pour le raccordement à une source d'alimenta­tion en gaz, caractérisée en ce que ledit tube d'ame­née (11) débouche dans un distributeur (15) d'où par­tent plusieurs tubes d'injection (18) disposés paral­lèlement et concentriquement par rapport à l'axe longitudinal (A-A) de la lance, les tubes d'injection (18) précités étant noyés dans la gaine (21) en matiè­re réfractaire.1. Blowing lance intended to inject gas into liquid steel, comprising a metal supply tube surrounded by a sheath of refractory material over at least part of its length, said metal tube having one end provided with a fixing device for connection to a gas supply source, characterized in that said supply tube (11) opens into a distributor (15) from which several injection tubes (18) arranged in parallel leave, and concentrically with respect to the longitudinal axis (AA) of the lance, the aforementioned injection tubes (18) being embedded in the sheath (21) of refractory material. 2. Lance selon la revendication 1, caractérisée en ce que le distributeur (15) précité comporte deux cham­bres (16, 17) séparées l'une de l'autre, la première chambre (16) communiquant d'une part avec le tube d'amenée (11) précité et d'autre part avec plusieurs premiers tubes d'injection (18), et la seconde chambre (17) communiquant d'une part avec un second conduit d'amenée (24) et d'autre part avec plusieurs seconds tubes d'injection (26), le second conduit d'amenée (24) étant pourvu d'un dispositif de fixation pour le raccordement à une seconde source d'alimentation en gaz et lesdits premiers et seconds tubes d'injection étant noyés dans la gaine (21) en matière réfractaire.2. Lance according to claim 1, characterized in that the aforementioned distributor (15) comprises two chambers (16, 17) separated from each other, the first chamber (16) communicating on the one hand with the tube d feed (11) above and on the other hand with several first injection tubes (18), and the second chamber (17) communicating on the one hand with a second supply conduit (24) and on the other hand with several second injection tubes (26), the second supply conduit (24) being provided with a fixing device for connection to a second gas supply source and said first and second injection tubes being embedded in the sheath (21) of refractory material. 3. Lance selon l'une quelconque des revendications 1 et 2, dans laquelle la gaine réfractaire (21) comprend un treillis métallique (22) noyé dans la masse, ce treillis s'étendant autour des tubes d'injection (18, 26) précités.3. Lance according to any one of claims 1 and 2, in which the refractory sheath (21) comprises a wire mesh (22) embedded in the mass, this mesh extending around the injection tubes (18, 26) cited above.
EP90870168A 1989-10-09 1990-10-04 Multi-tube blowing lance Withdrawn EP0423098A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8901082A BE1003516A3 (en) 1989-10-09 1989-10-09 MULTI-TUBE BLOWING LANCE.
BE8901082 1989-10-09

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EP0423098A1 true EP0423098A1 (en) 1991-04-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5830259A (en) * 1996-06-25 1998-11-03 Ltv Steel Company, Inc. Preventing skull accumulation on a steelmaking lance
US5865876A (en) * 1995-06-07 1999-02-02 Ltv Steel Company, Inc. Multipurpose lance
US5885323A (en) * 1997-04-25 1999-03-23 Ltv Steel Company, Inc. Foamy slag process using multi-circuit lance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5810905A (en) * 1996-10-07 1998-09-22 Cleveland Cliffs Iron Company Process for making pig iron
GB0128878D0 (en) * 2001-12-03 2002-01-23 Boc Group Plc Metallurgical lance and apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1452175A (en) * 1965-07-26 1966-02-25 Ferodo Sa Heat resistant tube, and method of obtaining it
GB2120369A (en) * 1982-05-20 1983-11-30 Ksr Int Ltd An improved metallurgical lance
US4767598A (en) * 1986-09-22 1988-08-30 Aluminum Company Of America Injection apparatus for introduction of a fluid material into a molten metal bath and associated method
EP0332292A1 (en) * 1988-02-24 1989-09-13 Foseco International Limited Rotary device, apparatus and method for treating molten metal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852860A (en) * 1987-08-24 1989-08-01 Bethlehem Steel Corporation Consumable injection lance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1452175A (en) * 1965-07-26 1966-02-25 Ferodo Sa Heat resistant tube, and method of obtaining it
GB2120369A (en) * 1982-05-20 1983-11-30 Ksr Int Ltd An improved metallurgical lance
US4767598A (en) * 1986-09-22 1988-08-30 Aluminum Company Of America Injection apparatus for introduction of a fluid material into a molten metal bath and associated method
EP0332292A1 (en) * 1988-02-24 1989-09-13 Foseco International Limited Rotary device, apparatus and method for treating molten metal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5865876A (en) * 1995-06-07 1999-02-02 Ltv Steel Company, Inc. Multipurpose lance
US5830259A (en) * 1996-06-25 1998-11-03 Ltv Steel Company, Inc. Preventing skull accumulation on a steelmaking lance
US5885323A (en) * 1997-04-25 1999-03-23 Ltv Steel Company, Inc. Foamy slag process using multi-circuit lance

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BE1003516A3 (en) 1992-04-14
US5088696A (en) 1992-02-18

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