WO1999011827A1 - Oxygen injection lance orifice for steel-producing electric furnace - Google Patents
Oxygen injection lance orifice for steel-producing electric furnace Download PDFInfo
- Publication number
- WO1999011827A1 WO1999011827A1 PCT/FR1998/001852 FR9801852W WO9911827A1 WO 1999011827 A1 WO1999011827 A1 WO 1999011827A1 FR 9801852 W FR9801852 W FR 9801852W WO 9911827 A1 WO9911827 A1 WO 9911827A1
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- WIPO (PCT)
- Prior art keywords
- nozzle
- oxygen
- central duct
- injection nozzle
- wall
- 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.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
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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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
- C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to an oxygen injection lance nose for an electric steel production oven.
- an oxygen injection lance is often used to inject oxygen directly into the mass of liquid steel.
- the nose of this lance is placed a short distance from the liquid steel bath and is oriented so that the flow of oxygen injected is substantially vertical, in order to ensure optimum penetration of oxygen into the mass of liquid steel.
- This lance nose is particularly exposed to the aggressions of the liquid steel bath because it is directly attacked by the radiation of the liquid steel as well as by the projections of molten metal.
- a known injection lance nose comprises a central oxygen supply duct and a cooling fluid circuit enveloping the central duct.
- the central conduit is made of copper, and has a bent monobloc end which has a proximal portion defining an oxygen supply chamber and a distal end including a housing for a copper injection nozzle attached by screwing.
- Nozzles of this type are for example described in the documents GB-A-847 848 and WO-A-96 06954. It should be noted that the nozzles described in these documents are fixed permanently, without screwing, by the lance nose .
- the injection nozzle is a consumable part which must be changed regularly. This is the reason why this injection nozzle is sometimes mounted screwed into the bent end.
- This screw connection of the nozzle in the bent end of the central duct must however be perfectly sealed in order to avoid any uncontrolled oxygen leakage which could affect the nozzle supply conditions and consequently the oxygen penetration performance in liquid steel.
- the use of seals is not possible due to the ambient temperature.
- the threading of the distal end of the lance nose usually extends to the outlet, so that the screw connection can seize up as a result of metal splashes coming from the bath of liquid steel.
- the object of the invention is to produce an oxygen injection lance nose which does not have the aforementioned drawbacks.
- the nozzle has a cylindrical body and a threaded tail of smaller diameter, with a conical shoulder between the body and the tail, while the housing of the injection nozzle is a stepped bore comprising successively, of the upstream downstream with reference to a direction of flow of oxygen, a first threaded portion receiving the threaded tail of the injection nozzle, a conical shoulder against which the shoulder of the nozzle is supported, and a second portion of larger diameter than the first portion and receiving the cylindrical body of the nozzle.
- the nozzle thread and the corresponding thread of the housing are located as far back as possible from the liquid steel bath, which minimizes the effects of radiation on the threads and avoids their exposure. with projections of molten metal.
- the conical shoulders of the nozzle and its housing are in tight support in a conical surface, which ensures optimum sealing whatever the dimensional variations of the nozzle and its' housing under the effect of thermal fluctuations.
- the central duct is made of steel. This further improves the sealing of the connection of the nozzle in its housing.
- the mechanical rigidity of the steel makes it possible to have a short thread for screwing the threaded tail of the injection nozzle.
- the cooling circuit has an outer wall having an end which is bent in correspondence with the central duct.
- the cooling circuit thus follows the bent shape of the central duct for optimum cooling.
- the outer wall of the cooling circuit is coated with an electrically insulating coating of refractory material.
- This clothe ⁇ insulating refractory material which may advantageously be made in two half-shells, prevents from forming between the lance and an electrode or any other metallic element in charge of the furnace electric arc which deteriorate the lance.
- the bent shape of the nose lance further provides, without other fastening means, the retention of the clothed ⁇ insulator on the nose lance, which was not possible with the hemispherical shape of the distal end of nose lance known.
- the elbow of the central duct and the outer wall is formed by the juxtaposition of pairs of bevelled tubular sections, joined edge to edge by welding.
- the manufacture of the lance nose is therefore particularly simple.
- the cooling circuit has a perfectly regular passage section, which is favorable for cooling.
- the outer wall has a distal end ' provided with a re-entrant collar connected to the distal end of the central duct.
- the re-entrant flange and forms an end wall closing the refroi circuit ⁇ disse provided between the outer surface of the central duct and the inner surface of the outer wall.
- the re-entrant flange of the external wall covers the end face of the distal end of the central duct.
- the re-entrant collar of the outer wall thus forms a protective screen for the end face of the central duct.
- FIG. 1 is a sectional view of an injection lance nose according to the invention.
- FIG. 2 is a detail view in section of the injection nozzle alone
- Figure 3 is a view similar to Figure 2 illustrating an alternative embodiment of the injection nozzle, with several nozzles.
- FIG. 1 there is shown an oxygen injection lance nose for an electric oven with a liquid steel bath according to the invention.
- This lance nose comprises a central duct 1 for supplying oxygen.
- This central duct is made of steel and has a bent monobloc end which has a proximal portion 2 defining an oxygen supply chamber 3 with axis 4 and a distal end 5 including a housing for an injection nozzle 6 attached by screwing.
- the injection nozzle 6 is made of copper.
- It has a central nozzle 7 of axis 8 forming with the axis 4 an obtuse angle of approximately 140 ° and has a cylindrical body 9 and a threaded tail 10 of smaller diameter.
- a conical shoulder 11 is formed between the body 9 and the tail 10.
- the injection nozzle 6 also has a distal face 12 in which are provided blind manipulation holes 13 into which the lugs of a special tool can be introduced. screwing / unscrewing pins of known type (not shown).
- the housing formed in the distal end 5 of the central duct 1 for the injection nozzle 6 is a stage bore of axis 8 comprising successively, from upstream to downstream by reference to a direction of flow of the oxygen, a first threaded portion 14 receiving the threaded tail 10 of the injection nozzle 6, a conical shoulder 15 against which the shoulder 11 of the nozzle 6 bears, and a second portion 16 of larger diameter than the first portion threaded 14 and receiving the cylindrical body 9 of the nozzle 6.
- the lance nose 1 also comprises a cooling fluid circuit 17 enveloping the central duct 1.
- This cooling circuit has a tubular external wall 18 which extends around the duct central 1, remote from the outer surface thereof, to delimit with this surface a peripheral layer for circulation of the coolant.
- the outer wall 18 is bent in correspondence with the central duct 1 and has a distal end provided with a re-entrant collar 19 connected by welding to the distal end of the central duct 1 to form an end wall closing the liquid circulation layer cooling.
- the re-entrant collar 19 of the external wall 18 covers the end face 5.1 of the distal end 5 of the central duct 1.
- the end face 5.1 of the central duct 1 is thus' protected from radiation and splashes from the liquid steel bath.
- a tubular intermediate partition wall 22 is disposed between the central duct 1 and the outer wall 18 in order to divide the peripheral layer for circulating the coolant into two sub-layers, one for supplying the other for return of liquid, the distal end 22.1 of this wall being slightly set back from the re-entrant collar 19 to allow the circulation of the cooling fluid between the two sub-layers.
- the outer wall 18 of the cooling circuit is further coated with an electrically insulating coating 20 of refractory material.
- This insulating coating of refractory material can be produced in two half-shells. Its presence prevents the formation of an electric arc between the lance and an electrode or any other metallic element charged with the furnace, which would damage the lance.
- the elbow formed by the central duct 1, the outer 18 and intermediate 11 walls, and the covering 20 is produced by the juxtaposition of pairs of bevelled tubular sections, joined edge to edge by welding according to a welding plane. 21 perpendicular to axis 4 and forming an angle of about 50 ° with axis 8.
- FIG. 3 there is shown an alternative embodiment of the injection nozzle.
- This is here designated by the general reference 22 and has an external shape identical to that of the injection nozzle previously described with reference to FIG. 2.
- the nozzle 2 has three injection nozzles 23 with axes 24 parallel to the axis 8 of the stage bore of the distal end 5 of the central duct 1, instead of a single central nozzle as was the case in the embodiment of FIG. 2.
- the use of such a' injection nozzle with multiple nozzles may be advantageous under certain conditions of use, depending on the flow of oxygen injected and the ambient temperature.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Charging Or Discharging (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
Nez de lance d'injection d'oxygène pour four électrique de production d'acier. Oxygen injection lance for electric steel production furnace.
La présente invention concerne un nez de lance d'injection d'oxygène pour four électrique de production d' acier.The present invention relates to an oxygen injection lance nose for an electric steel production oven.
Dans un four électrique de production d'acier, on utilise souvent une lance d'injection d'oxygène permettant d'injecter de l'oxygène directement dans la masse d'acier liquide. Le nez de cette lance est placé à faible distance du bain d'acier liquide et est orienté de façon à ce que le flux d'oxygène injecté soit sensiblement vertical, afin d'assurer une pénétration optimum de l'oxygène dans la masse d'acier liquide. Ce nez de lance est particulièrement exposé aux agressions du bain d'acier liquide car il est directement agressé par le rayonnement de l'acier liquide ainsi que par les projections de métal fondu. Actuellement, un nez de lance d'injection connu comporte un conduit central d'amenée d'oxygène et un circuit de fluide de refroidissement enveloppant le conduit central. Le conduit central est en cuivre, et présente une extrémité coudée monobloc qui possède une portion proximale définissant une chambre d'amenée d'oxygène et une extrémité distale incluant un logement pour une buse d'injection en cuivre rapportée par vissage.In an electric steel production furnace, an oxygen injection lance is often used to inject oxygen directly into the mass of liquid steel. The nose of this lance is placed a short distance from the liquid steel bath and is oriented so that the flow of oxygen injected is substantially vertical, in order to ensure optimum penetration of oxygen into the mass of liquid steel. This lance nose is particularly exposed to the aggressions of the liquid steel bath because it is directly attacked by the radiation of the liquid steel as well as by the projections of molten metal. Currently, a known injection lance nose comprises a central oxygen supply duct and a cooling fluid circuit enveloping the central duct. The central conduit is made of copper, and has a bent monobloc end which has a proximal portion defining an oxygen supply chamber and a distal end including a housing for a copper injection nozzle attached by screwing.
Des buses de ce type sont par exemple décrites dans les documents GB-A-847 848 et WO-A-96 06954. Il convient de noter que les buses décrites dans ces documents sont fixées à demeure, sans vissage, par le nez de lance. Pour une illustration plus large de l'arrière-plan technologique général, on pourra également se reporter aux documents DE-B-11 51 266, US-A-5 217 363, US-A-4 732 370, US-A-5 377 960 et EP-A-0 627 492.Nozzles of this type are for example described in the documents GB-A-847 848 and WO-A-96 06954. It should be noted that the nozzles described in these documents are fixed permanently, without screwing, by the lance nose . For a broader illustration of the general technological background, reference may also be made to documents DE-B-11 51 266, US-A-5 217 363, US-A-4 732 370, US-A-5 377,960 and EP-A-0 627 492.
La buse d'injection est une pièce de consommation qui doit être régulièrement changée. C'est la raison pour laquelle cette buse d'injection est parfois montée vissée dans l'extrémité coudée. Cette liaison par vissage de la buse dans l'extrémité coudée du conduit central doit toutefois être parfaitement étanche afin d'éviter toute fuite d'oxygène incontrôlée qui risquerait d'affecter les conditions d'alimentation de la buse et par voie de conséquence les performances de pénétration de l'oxygène dans l'acier liquide. Or, l'utilisation de joints d'étan- chéité n'est pas envisageable du fait de la température ambiante. De plus, le filetage de l'extrémité distale du nez de lance s'étend habituellement jusqu'à l'orifice de sortie, de sorte que la liaison vissée peut se gripper par suite de projections de métal venant du bain d'acier liquide .The injection nozzle is a consumable part which must be changed regularly. This is the reason why this injection nozzle is sometimes mounted screwed into the bent end. This screw connection of the nozzle in the bent end of the central duct must however be perfectly sealed in order to avoid any uncontrolled oxygen leakage which could affect the nozzle supply conditions and consequently the oxygen penetration performance in liquid steel. However, the use of seals is not possible due to the ambient temperature. In addition, the threading of the distal end of the lance nose usually extends to the outlet, so that the screw connection can seize up as a result of metal splashes coming from the bath of liquid steel.
L'invention a pour but de réaliser un nez de lance d'injection d'oxygène ne présentant pas les inconvé- nients précités.The object of the invention is to produce an oxygen injection lance nose which does not have the aforementioned drawbacks.
Selon l'invention, la buse possède un corps cylindrique et une queue filetée de plus petit diamètre, avec un épaulement conique entre le corps et la queue, tandis que le logement de la buse d'injection est un alésage étage comportant successivement, de l'amont vers l'aval par référence à un sens d'écoulement de l'oxygène, une première portion taraudée recevant la queue filetée de la buse d'injection, un épaulement conique contre lequel prend appui l' épaulement de la buse, et une seconde portion de plus grand diamètre que la première portion et recevant le corps cylindrique de la buse.According to the invention, the nozzle has a cylindrical body and a threaded tail of smaller diameter, with a conical shoulder between the body and the tail, while the housing of the injection nozzle is a stepped bore comprising successively, of the upstream downstream with reference to a direction of flow of oxygen, a first threaded portion receiving the threaded tail of the injection nozzle, a conical shoulder against which the shoulder of the nozzle is supported, and a second portion of larger diameter than the first portion and receiving the cylindrical body of the nozzle.
Avec cet agencement de la buse et de son logement, le filetage de la buse et le taraudage correspondant du logement sont situés le plus en retrait possible du bain d'acier liquide, ce qui minimise les effets du rayonnement sur les filets et évite leur exposition aux projections de métal fondu. De plus, les épaulements coniques de la buse et de son logement sont en appui serré selon une surface conique, ce qui assure une étanchéité optimum quelles que soient les variations dimensionnelles de la buse et de son' logement sous l'effet des fluctuations thermiques.With this arrangement of the nozzle and its housing, the nozzle thread and the corresponding thread of the housing are located as far back as possible from the liquid steel bath, which minimizes the effects of radiation on the threads and avoids their exposure. with projections of molten metal. In addition, the conical shoulders of the nozzle and its housing are in tight support in a conical surface, which ensures optimum sealing whatever the dimensional variations of the nozzle and its' housing under the effect of thermal fluctuations.
Avantageusement, le conduit central est réalisé en acier. On améliore ainsi encore 1 ' étanchéité de la liaison de la buse dans son logement. De plus, la rigidité mécanique de l'acier permet d'avoir un filetage de faible longueur pour le vissage de la queue filetée de la buse d' injection.Advantageously, the central duct is made of steel. This further improves the sealing of the connection of the nozzle in its housing. In addition, the mechanical rigidity of the steel makes it possible to have a short thread for screwing the threaded tail of the injection nozzle.
Selon une caractéristique avantageuse de l'invention, le circuit de refroidissement possède une paroi extérieure présentant une extrémité qui est coudée en correspondance avec le conduit central . Le circuit de refroidissement épouse ainsi la forme coudée du conduit central pour un refroidissement optimum.According to an advantageous characteristic of the invention, the cooling circuit has an outer wall having an end which is bent in correspondence with the central duct. The cooling circuit thus follows the bent shape of the central duct for optimum cooling.
Avantageusement alors, la paroi extérieure du circuit de refroidissement est enrobée d'un revêtement électriquement isolant de matériau réfractaire. Ce revête¬ ment isolante de matériau réfractaire, qui peut avantageusement être réalisé en deux demi-coquilles, évite que ne se forme entre la lance et une électrode ou tout autre élément métallique chargé du four un arc électrique qui détériorerait la lance. La forme coudée du nez de lance assure en outre, sans autre moyen de fixation, la retenue du revête¬ ment isolant sur le nez de lance, ce qui n'était pas possible avec la forme hémisphérique de l'extrémité distale des nez de lance connus.Advantageously then, the outer wall of the cooling circuit is coated with an electrically insulating coating of refractory material. This clothe ¬ insulating refractory material, which may advantageously be made in two half-shells, prevents from forming between the lance and an electrode or any other metallic element in charge of the furnace electric arc which deteriorate the lance. The bent shape of the nose lance further provides, without other fastening means, the retention of the clothed ¬ insulator on the nose lance, which was not possible with the hemispherical shape of the distal end of nose lance known.
Dans un mode de réalisation avantageux, le coude du conduit central et de la paroi extérieure est formé par la juxtaposition de paires de tronçons tubulaires biseautés, raccordés bord à bord par soudure. La fabrication du nez de lance est ainsi particulièrement simple. De plus, le circuit de refroidissement présente une section de passage parfaitement régulière, ce qui est favorable pour le refroidissement .In an advantageous embodiment, the elbow of the central duct and the outer wall is formed by the juxtaposition of pairs of bevelled tubular sections, joined edge to edge by welding. The manufacture of the lance nose is therefore particularly simple. In addition, the cooling circuit has a perfectly regular passage section, which is favorable for cooling.
Selon une caractéristique avantageuse de l'inven- tion, la paroi extérieure possède une extrémité distale' pourvue d'une collerette rentrante raccordée à l'extrémité distale du conduit central. La collerette rentrante forme ainsi une paroi d'extrémité fermant le circuit de refroi¬ dissement ménagé entre la surface extérieure du conduit central et la surface intérieure de la paroi extérieure .According to an advantageous characteristic of the invention, the outer wall has a distal end ' provided with a re-entrant collar connected to the distal end of the central duct. The re-entrant flange and forms an end wall closing the refroi circuit ¬ dissement provided between the outer surface of the central duct and the inner surface of the outer wall.
Avantageusement alors, la collerette rentrante de la paroi extérieure recouvre la face terminale de l'extrémité distale du conduit central . La collerette rentrante de la paroi extérieure forme ainsi un écran de protection de la face terminale du conduit central .Advantageously then, the re-entrant flange of the external wall covers the end face of the distal end of the central duct. The re-entrant collar of the outer wall thus forms a protective screen for the end face of the central duct.
Dans une variante de réalisation, la buse d'injection possède plusieurs tuyères d'injection.In an alternative embodiment, the injection nozzle has several injection nozzles.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit d'un mode de réalisation particulier, donné à titre d'exemple non limitatif.Other characteristics and advantages of the invention will appear on reading the following description of a particular embodiment, given by way of nonlimiting example.
Il sera fait référence aux dessins annexés, parmi lesquels :Reference will be made to the appended drawings, among which:
- la figure 1 est une vue en coupe d'un nez de lance d'injection conforme à l'invention ;- Figure 1 is a sectional view of an injection lance nose according to the invention;
- la figure 2 est une vue de détail en coupe de la buse d'injection seule ;- Figure 2 is a detail view in section of the injection nozzle alone;
- la figure 3 est une vue analogue à la figure 2 illustrant une variante de réalisation de la buse d'injec- tion, avec plusieurs tuyères.- Figure 3 is a view similar to Figure 2 illustrating an alternative embodiment of the injection nozzle, with several nozzles.
A la figure 1, on a représenté un nez de lance d'injection d'oxygène pour four électrique à bain d'acier liquide conforme à l'invention. Ce nez de lance comporte un conduit central 1 d'amenée d'oxygène. Ce conduit central est réalisé en acier et présente une extrémité coudée monobloc qui possède une portion proximale 2 définissant une chambre d'amenée d'oxygène 3 d'axe 4 et une extrémité distale 5 incluant un logement pour une buse d'injection 6 rapportée par vissage. La buse d'injection 6 est réalisée en cuivre.' Elle présente une tuyère centrale 7 d'axe 8 formant avec l'axe 4 un angle obtus d'environ 140° et possède un corps cylindrique 9 et une queue filetée 10 de plus petit diamètre. Un épaulement conique 11 est ménagé entre le corps 9 et la queue 10. La buse d'injection 6 possède en outre une face distale 12 dans laquelle sont ménagés des trous borgnes de manipulation 13 dans lesquels peuvent être introduits les ergots d'un outil spécial de vissage/dévissage à ergots de type connu (non représenté) . Le logement ménagé dans l'extrémité distale 5 du conduit central 1 pour la buse d'injection 6 est un alésage étage d'axe 8 comportant successivement, de l'amont vers l'aval par référence à un sens d'écoulement de l'oxygène, une première portion taraudée 14 recevant la queue filetée 10 de la buse d'injection 6, un épaulement conique 15 contre lequel prend appui l' épaulement 11 de la buse 6, et une seconde portion 16 de plus grand diamètre que la première portion taraudée 14 et recevant le corps cylindrique 9 de la buse 6. Le nez de lance 1 comporte également un circuit de fluide de refroidissement 17 enveloppant le conduit central 1. Ce circuit de refroidissement possède une paroi extérieure tubulaire 18 qui s'étend autour du conduit central 1, à distance de la surface extérieure de celui-ci, pour délimiter avec cette surface une couche périphérique de circulation du liquide de refroidissement . La paroi extérieure 18 est coudée en correspondance avec le conduit central 1 et possède une extrémité distale pourvue d'une collerette rentrante 19 raccordée par soudage à l'extrémité distale du conduit central 1 pour former une paroi de bout fermant la couche de circulation du liquide de refroidissement. Comme cela est visible à la figure 1, la collerette rentrante 19 de la paroi extérieure 18 recouvre la face terminale 5.1 de l'extrémité distale 5 du conduit central 1. La face terminale 5.1 du conduit central 1 est ainsi' protégée du rayonnement et des projections du bain d'acier liquide. Une paroi intermédiaire tubulaire de séparation 22 est disposée entre le conduit central 1 et la paroi extérieure 18 pour diviser la couche périphérique de circulation du liquide de refroidissement en deux sous- couches, l'une d'amenée l'autre de retour de liquide, l'extrémité distale 22.1 de cette paroi étant légèrement en retrait de la collerette rentrante 19 pour permettre la circulation du fluide de refroidissement entre les deux sous-couches.In Figure 1, there is shown an oxygen injection lance nose for an electric oven with a liquid steel bath according to the invention. This lance nose comprises a central duct 1 for supplying oxygen. This central duct is made of steel and has a bent monobloc end which has a proximal portion 2 defining an oxygen supply chamber 3 with axis 4 and a distal end 5 including a housing for an injection nozzle 6 attached by screwing. The injection nozzle 6 is made of copper. ' It has a central nozzle 7 of axis 8 forming with the axis 4 an obtuse angle of approximately 140 ° and has a cylindrical body 9 and a threaded tail 10 of smaller diameter. A conical shoulder 11 is formed between the body 9 and the tail 10. The injection nozzle 6 also has a distal face 12 in which are provided blind manipulation holes 13 into which the lugs of a special tool can be introduced. screwing / unscrewing pins of known type (not shown). The housing formed in the distal end 5 of the central duct 1 for the injection nozzle 6 is a stage bore of axis 8 comprising successively, from upstream to downstream by reference to a direction of flow of the oxygen, a first threaded portion 14 receiving the threaded tail 10 of the injection nozzle 6, a conical shoulder 15 against which the shoulder 11 of the nozzle 6 bears, and a second portion 16 of larger diameter than the first portion threaded 14 and receiving the cylindrical body 9 of the nozzle 6. The lance nose 1 also comprises a cooling fluid circuit 17 enveloping the central duct 1. This cooling circuit has a tubular external wall 18 which extends around the duct central 1, remote from the outer surface thereof, to delimit with this surface a peripheral layer for circulation of the coolant. The outer wall 18 is bent in correspondence with the central duct 1 and has a distal end provided with a re-entrant collar 19 connected by welding to the distal end of the central duct 1 to form an end wall closing the liquid circulation layer cooling. As can be seen in FIG. 1, the re-entrant collar 19 of the external wall 18 covers the end face 5.1 of the distal end 5 of the central duct 1. The end face 5.1 of the central duct 1 is thus' protected from radiation and splashes from the liquid steel bath. A tubular intermediate partition wall 22 is disposed between the central duct 1 and the outer wall 18 in order to divide the peripheral layer for circulating the coolant into two sub-layers, one for supplying the other for return of liquid, the distal end 22.1 of this wall being slightly set back from the re-entrant collar 19 to allow the circulation of the cooling fluid between the two sub-layers.
La paroi extérieure 18 du circuit de refroidissement est de plus enrobée d'un revêtement 20 électriquement isolant en matériau réfractaire. Ce revêtement isolant en matériau réfractaire peut être réalisé en deux demi-coquilles. Sa présence évite que ne se forme entre la lance et une électrode ou tout autre élément métallique chargé du four un arc électrique qui détériorerait la lance .The outer wall 18 of the cooling circuit is further coated with an electrically insulating coating 20 of refractory material. This insulating coating of refractory material can be produced in two half-shells. Its presence prevents the formation of an electric arc between the lance and an electrode or any other metallic element charged with the furnace, which would damage the lance.
Dans l'exemple illustré, le coude formé par le conduit central 1, les parois extérieure 18 et intermédiaire 11, et le revêtement 20 est réalisé par la juxtaposition de paires de tronçons tubulaires biseautés, raccordés bord à bord par soudure selon un plan de soudure 21 perpendiculaire à l'axe 4 et formant un angle d'environ 50° avec l'axe 8.In the example illustrated, the elbow formed by the central duct 1, the outer 18 and intermediate 11 walls, and the covering 20 is produced by the juxtaposition of pairs of bevelled tubular sections, joined edge to edge by welding according to a welding plane. 21 perpendicular to axis 4 and forming an angle of about 50 ° with axis 8.
A la figure 3, on a représenté une variante de réalisation de la buse d'injection. Celle-ci est ici désignée par la référence générale 22 et présente une forme extérieure identique à celle de la buse d'injections précédemment décrite en référence à la figure 2. Intérieurement, la buse 2 possède trois tuyères d'injection 23 d'axes 24 parallèle à l'axe 8 de l'alésage étage de l'extrémité distale 5 du conduit central 1, au lieu d'une tuyère centrale unique comme cela était le cas dans le mode de réalisation de la figure 2. L'utilisation d'une telle' buse d'injection à tuyères multiples pourra être avantageuse dans certaines conditions d'utilisation, en fonction du débit d'oxygène injecté et de la température ambiante. In Figure 3, there is shown an alternative embodiment of the injection nozzle. This is here designated by the general reference 22 and has an external shape identical to that of the injection nozzle previously described with reference to FIG. 2. Internally, the nozzle 2 has three injection nozzles 23 with axes 24 parallel to the axis 8 of the stage bore of the distal end 5 of the central duct 1, instead of a single central nozzle as was the case in the embodiment of FIG. 2. The use of such a' injection nozzle with multiple nozzles may be advantageous under certain conditions of use, depending on the flow of oxygen injected and the ambient temperature.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU90790/98A AU9079098A (en) | 1997-09-01 | 1998-08-26 | Oxygen injection lance orifice for steel-producing electric furnace |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR97/10851 | 1997-09-01 | ||
| FR9710851A FR2767840A1 (en) | 1997-09-01 | 1997-09-01 | NOZZLE FOR OXYGEN INJECTION FOR ELECTRIC STEEL PRODUCTION OVEN |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999011827A1 true WO1999011827A1 (en) | 1999-03-11 |
Family
ID=9510642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1998/001852 Ceased WO1999011827A1 (en) | 1997-09-01 | 1998-08-26 | Oxygen injection lance orifice for steel-producing electric furnace |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU9079098A (en) |
| FR (1) | FR2767840A1 (en) |
| WO (1) | WO1999011827A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20031397A1 (en) * | 2003-07-09 | 2005-01-10 | Danieli Off Mecc | BURNER AND GAS INJECTION DEVICE. |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB847848A (en) * | 1957-08-02 | 1960-09-14 | British Oxygen Co Ltd | Treatment of ferrous material |
| DE1151266B (en) * | 1959-12-29 | 1963-07-11 | Der Dillinger Huettenwerke Ag | Especially for Siemens-Martin-OEfen certain dual and multi-fuel burners for high heat loads |
| US4732370A (en) * | 1986-07-17 | 1988-03-22 | Berry William W | Self contained double O'ring slip joint and quick disconnect lance |
| US5217363A (en) * | 1992-06-03 | 1993-06-08 | Gaz Metropolitan & Co., Ltd. And Partnership | Air-cooled oxygen gas burner assembly |
| EP0627492A1 (en) * | 1993-06-02 | 1994-12-07 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Smelting furnace with gas injector |
| US5377960A (en) * | 1993-03-01 | 1995-01-03 | Berry Metal Company | Oxygen/carbon blowing lance assembly |
| WO1996006954A1 (en) * | 1994-08-29 | 1996-03-07 | American Combustion, Incorporated | Method and apparatus for electric steelmaking |
-
1997
- 1997-09-01 FR FR9710851A patent/FR2767840A1/en active Pending
-
1998
- 1998-08-26 AU AU90790/98A patent/AU9079098A/en not_active Abandoned
- 1998-08-26 WO PCT/FR1998/001852 patent/WO1999011827A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB847848A (en) * | 1957-08-02 | 1960-09-14 | British Oxygen Co Ltd | Treatment of ferrous material |
| DE1151266B (en) * | 1959-12-29 | 1963-07-11 | Der Dillinger Huettenwerke Ag | Especially for Siemens-Martin-OEfen certain dual and multi-fuel burners for high heat loads |
| US4732370A (en) * | 1986-07-17 | 1988-03-22 | Berry William W | Self contained double O'ring slip joint and quick disconnect lance |
| US5217363A (en) * | 1992-06-03 | 1993-06-08 | Gaz Metropolitan & Co., Ltd. And Partnership | Air-cooled oxygen gas burner assembly |
| US5377960A (en) * | 1993-03-01 | 1995-01-03 | Berry Metal Company | Oxygen/carbon blowing lance assembly |
| EP0627492A1 (en) * | 1993-06-02 | 1994-12-07 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Smelting furnace with gas injector |
| WO1996006954A1 (en) * | 1994-08-29 | 1996-03-07 | American Combustion, Incorporated | Method and apparatus for electric steelmaking |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2767840A1 (en) | 1999-03-05 |
| AU9079098A (en) | 1999-03-22 |
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