EP0234388A2 - Lance for blowing oxygen - Google Patents

Lance for blowing oxygen Download PDF

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Publication number
EP0234388A2
EP0234388A2 EP87101776A EP87101776A EP0234388A2 EP 0234388 A2 EP0234388 A2 EP 0234388A2 EP 87101776 A EP87101776 A EP 87101776A EP 87101776 A EP87101776 A EP 87101776A EP 0234388 A2 EP0234388 A2 EP 0234388A2
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EP
European Patent Office
Prior art keywords
mouth
nozzle
chamber
lance
jet
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Granted
Application number
EP87101776A
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German (de)
French (fr)
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EP0234388A3 (en
EP0234388B1 (en
Inventor
André Bock
Romain Henrion
Jean Liesch
Carlo Heintz
Henri Klein
Jean-François Liesch
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Arcelor Luxembourg SA
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Arbed SA
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Priority to AT87101776T priority Critical patent/ATE71151T1/en
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Publication of EP0234388A3 publication Critical patent/EP0234388A3/en
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Publication of EP0234388B1 publication Critical patent/EP0234388B1/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

Definitions

  • the invention relates to a blowing lance for refining metals of ferroalloys respectively by blowing oxygen from above.
  • An oxygen blowing lance normally comprises at least one vertical nozzle intended to supply an oxygen jet for the refining proper. It can also comprise at least one lateral nozzle, intended to provide an oxygen jet, softer than the vertical jet, for burning the carbon monoxide formed during the refining and creating an excess of thermal energy (see eg the patent LU 78 906) as well as possibly a nozzle guiding solid materials suspended in a carrier gas (see for example the patent LU 84 433).
  • the vertical jet strikes the surface of the bath and must have a sufficient impulse to pass through the slag layer or to push it back, in order to reach the metal; it is also necessary for the jet to cause mixing of the slag with the bath, to accelerate the metallurgical reactions between these two liquid phases.
  • the object of the present invention is to design a lance capable of supplying an airship gas jet, in which the mobile mechanical means are reduced to a minimum to avoid the problems stated above.
  • an oxygen jet is blown through a vertical nozzle, this jet will have a vertical direction and will behave in a conventional manner, well known by steelmakers. However, if oxygen, or any other gas, is blown at the same time through a lateral nozzle, an overpressure zone is created in the chamber which extends from the mouth of the lateral nozzle. at the outlet of the head and which causes a deflection of the jet leaving the orifice of the head. It is understood that the lateral nozzles will be provided with gas flow control valves, in order to create inside the chamber conditions necessary to form the jet, both from the point of view of its impulse and from the point of view. view of its direction, or more precisely its angle of deviation from the vertical.
  • a major advantage achievable using the invention lies in the fact that it makes it possible to deflect the jet of oxygen and to move the point of impact on the surface of the bath, at will and at variable speed, without interrupting the blowing. This results in virtual enlargement of the impact zone and more pronounced mixing of the metal with the slag on the surface of the bath. Besides the favorable effects on the refining process, the displacement of the point of impact also causes a widening of the afterburning zone - see on this subject the patent LU 81 207-.
  • Another advantage offered by the invention resides in a more extensive distribution of the heat which reigns at the point of impact, so that on one side the temperature of the bath can rise and the other side the zone of intense heat, where there is the risk of nitriding, can be moved and thereby diluted.
  • the vertical nozzle 4 guides a jet of refining oxygen 3, of which the physical properties are determined by the pressure of the oxygen source, the flow control valve and the profile and dimensioning of the oxygen conduits from the source to the chamber 6 located in the extension of the nozzle 3.
  • This chamber 6, which connects the nozzle 4 to the mouth 7 of the lance, has a length of around 30 cm; it would only have a negligible influence on the dynamics of the oxygen jet 3 (slight increase in speed, function of the mouth section 7) if there were, in the vicinity of the place 9 where the nozzle 4 flares into chamber 6, the mouth 5 of several lateral conduits 10.
  • Chamber 6 has substantially the shape of a pear, truncated on the upper and lower sides.
  • the section of the mouth 7 is comparable to that of the place 9 where the chamber is connected to the nozzle 4.
  • the profile of the flaring near the nozzle 4 is not very critical but must be pronounced enough to achieve over a distance from a few tens of cm a progressive deviation of the jet to the desired deviation A.
  • Approaching the mouth 7, the angle taken by the interior profile of the chamber with the longitudinal axis BB ⁇ of the nozzle 4 tends towards the desired deflection angle A.
  • the interior profile of the chamber 6 is produced taking into account the distance from the mouth 7 - surface of the bath as well as the dimensions of the converter or, more precisely, the horizontal section of the converter at the normal height of the level of the bath.
  • the chamber 6 can be of revolution where present opposite each mouth 5 of the grooves in which the deflected jet 3 is housed. These grooves can have a depth such that they surround a third of the section of the jet 3 and possibly have a spiral arrangement around the axis BB ⁇ .
  • the lance body is the seat, not only of a reaction force which passes through the axis BB ⁇ , but also of a torque.
  • the operation of the device is as follows: At the start only the nozzle 4 is connected to the oxygen source, the various valves 11 are closed; a hard, vertical jet of primary oxygen hits the surface of the bath. As soon as a deflection of the jet is desired, one of the valves 11 is actuated and a gas jet enters the chamber 6, and creates a hatched overpressure zone 8. This overpressure zone causes a deflection of the jet 3 which bears, while keeping its shape, against the wall of the chamber which is opposite the mouth 5 which creates the suppression zone 8.
  • One possible embodiment provides for controlling the different valves 11 according to the progress of the refining process using a computer.
  • Fig.2 shows schematically the different points of impact achievable on the surface of the metal bath, thanks to a lance head comprising a vertical nozzle whose jet can be deflected by eight lateral conduits 10 as described above.
  • Point J0 is achieved by keeping the eight valves 11 closed. By opening one after the other one of the valves 11, it is possible to move the jet to achieve for example the point of impact J10, then J20 etc.
  • the lance head makes it possible to direct the jet towards each of the impact points represented, in the direction of the arrows and it is imagined that it is possible to pre-establish programs for scanning the surface, according to empirical diagrams, or proceed according to a given situation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Nozzles (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Arc Welding In General (AREA)

Abstract

A nozzle for refining metals or ferroalloys by oxygen blasting from above the melt is presented. The nozzle terminates at a nozzle head and includes at least one central blast pipe for directing a jet of oxygen having supersonic speed. A chamber is interposed between the mouth of the blast pipe and the mouth of the nozzle head. This chamber widens progressively from the mouth of the blast pipe, and narrows toward the mouth of the nozzle head. At least one opening from at least one lateral duct opens to the chamber in the vicinity of the blast pipe mouth. Each lateral duct is connected to a source of gas, and includes an inidividual flow control valve. Preferably, at least three lateral ducts are arranged symmetrically around the blast pipe mouth.

Description

L'invention concerne une lance de soufflage pour l'affinage de mé­taux respectivement de ferroalliages par soufflage d'oxygène par le haut.The invention relates to a blowing lance for refining metals of ferroalloys respectively by blowing oxygen from above.

Une lance de soufflage d'oxygène comprend normalement au moins une tuyère verticale destinée à fournir un jet d'oxygène pour l'affinage proprement dit. Elle peut en plus comprendre au moins une tuyère la­térale, destinée à fournir un jet d'oxygène, plus mou que le jet vertical, pour brûler le monoxyde de carbone formé au cours de l'af­finage et créer un surplus d'énergie thermique (voir p.ex. le brevet LU 78 906) ainsi qu'éventuellement une tuyère guidant des matières solides suspendues dans un gaz porteur (voir p. ex. le brevet LU 84 433).An oxygen blowing lance normally comprises at least one vertical nozzle intended to supply an oxygen jet for the refining proper. It can also comprise at least one lateral nozzle, intended to provide an oxygen jet, softer than the vertical jet, for burning the carbon monoxide formed during the refining and creating an excess of thermal energy (see eg the patent LU 78 906) as well as possibly a nozzle guiding solid materials suspended in a carrier gas (see for example the patent LU 84 433).

Le jet vertical frappe la surface du bain et doit présenter une im­pulsion suffisante pour traverser la couche de scorie ou pour la re­fouler, en vue d'atteindre le métal; il est également nécessaire que le jet provoque un brassage de la scorie avec le bain, pour accélé­rer les réactions métallurgiques entre ces deux phases liquides.The vertical jet strikes the surface of the bath and must have a sufficient impulse to pass through the slag layer or to push it back, in order to reach the metal; it is also necessary for the jet to cause mixing of the slag with the bath, to accelerate the metallurgical reactions between these two liquid phases.

Il est bien entendu que le point d'impact du jet sur la surface du bain est fixe et se situe plus ou moins au centre de cette surface. On sait depuis longtemps qu'il serait avantageux de pouvoir déplacer ce point d'impact d'une manière contrôlée, et ceci afin de mieux distribuer la chaleur intense qui règne au point d'impact et d'intensifier l'effet de brassage. Ainsi on a proposé des lances dont l'axe principal est incliné et où la lance entière peut osciller autour de la verticale. On a également conçu des têtes de lance dont l'embouchure présente des moyens mécaniques capables de dévier le jet d'oxygène, les dits moyens étant eux-mêmes mobiles et télécommandés.It is understood that the point of impact of the jet on the surface of the bath is fixed and is located more or less in the center of this surface. We have known for a long time that it would be advantageous to be able to move this point of impact in a controlled manner, and this in order to better distribute the intense heat which reigns at the point of impact and to intensify the stirring effect. So we proposed spears whose main axis is inclined and where the entire lance can oscillate around the vertical. Lance heads have also been designed, the mouth of which has mechanical means capable of deflecting the oxygen jet, the said means being themselves mobile and remote-controlled.

Le désavantage commun à toutes ces solutions proposées, réside dans la nécessité de faire fonctionner des moyens mécaniques qui sont tous exposés à une chaleur intense, à des poussières en grandes quantités et à l'action de l'oxygène, si bien que l'on rencontre dans la presque totalité des aciéries des lances de soufflage con­ventionnelles à jet principal unidirectionnel.The disadvantage common to all these proposed solutions lies in the need to operate mechanical means which are all exposed to intense heat, dust in large quantities and the action of oxygen, so that one found in almost all steelworks with conventional unidirectional main jet blowing lances.

Le but de la présente invention est de concevoir une lance capable de fournir un jet de gaz dirigeable, dans laquelle les moyens méca­niques mobiles sont réduits à un minimum pour éviter les problèmes énoncés plus haut.The object of the present invention is to design a lance capable of supplying an airship gas jet, in which the mobile mechanical means are reduced to a minimum to avoid the problems stated above.

Ce but est atteint grâce à la lance telle qu'elle est caractérisée dans la revendication 1. Des variations d'exécution préférentielles sont décrites dans les sous-revendications.This object is achieved thanks to the lance as it is characterized in claim 1. Preferential variations of execution are described in the sub-claims.

Si l'on souffle à travers une tuyère verticale un jet d'oxygène, ce jet aura une direction verticale et se comportera de manière conven­tionnelle, bien connue par les aciéristes. Or, si l'on souffle en même temps de l'oxygène, ou n'importe quel autre gaz, par un tuyère latérale, il est créé dans la chambre une zone de surpression qui s'étend depuis l'embouchure de la tuyère latérale à la sortie de la tête et qui provoque une déviation du jet sortant de l'orifice de la tête. Il est bien entendu que l'on munira les tuyères latérales de vannes de réglage du débit de gaz, afin de créer à l'intérieur de la chambre des conditions nécessaires pour former le jet, tant du point de vue de son impulsion que du point de vue de sa direction, ou plus précisément de son angle de déviation par rapport à la verticale.If an oxygen jet is blown through a vertical nozzle, this jet will have a vertical direction and will behave in a conventional manner, well known by steelmakers. However, if oxygen, or any other gas, is blown at the same time through a lateral nozzle, an overpressure zone is created in the chamber which extends from the mouth of the lateral nozzle. at the outlet of the head and which causes a deflection of the jet leaving the orifice of the head. It is understood that the lateral nozzles will be provided with gas flow control valves, in order to create inside the chamber conditions necessary to form the jet, both from the point of view of its impulse and from the point of view. view of its direction, or more precisely its angle of deviation from the vertical.

Un avantage majeur réalisable à l'aide de l'invention réside dans le fait qu'elle permet de dévier le jet d'oxygène et de déplacer le point d'impact sur la surface du bain, à volonté et à vitesse varia­ble, sans interruption du soufflage. Il en résulte en élargissement virtuel de la zone d'impact et un brassage plus prononcé du métal avec la scorie en surface du bain. A côté des effets favorables sur le processus d'affinage, le déplacement du point d'impact pro­voque également un élargissement de la zone de postcombustion - voir à ce sujet le brevet LU 81 207-. Un autre avantage offert par l'in­vention réside dans une distribution plus poussée de la chaleur qui règne au point d'impact, si bien que d'un côté la température du bain peut monter et que l'autre côté la zone de chaleur intense, où il existe le risque de la nitruration, peut être déplacée et par ce fait diluée.A major advantage achievable using the invention lies in the fact that it makes it possible to deflect the jet of oxygen and to move the point of impact on the surface of the bath, at will and at variable speed, without interrupting the blowing. This results in virtual enlargement of the impact zone and more pronounced mixing of the metal with the slag on the surface of the bath. Besides the favorable effects on the refining process, the displacement of the point of impact also causes a widening of the afterburning zone - see on this subject the patent LU 81 207-. Another advantage offered by the invention resides in a more extensive distribution of the heat which reigns at the point of impact, so that on one side the temperature of the bath can rise and the other side the zone of intense heat, where there is the risk of nitriding, can be moved and thereby diluted.

D'autres avantages et caractéristiques apparaîtront par la descrip­tion des dessins qui représentent de manière non-limitative une forme d'éxecution possible de la lance suivant l'invention et où

  • - la fig.1 est une coupe longitudinale schématique à travers une tête de la lance selon l'invention, tandis que
  • - la fig.2 est un schéma représentant la variabilité de l'emplace­ment du point d'impact du jet, suivant une forme d'exécution de la tête de lance.
Other advantages and characteristics will appear from the description of the drawings which non-limitatively represent a possible form of execution of the lance according to the invention and where
  • - Fig.1 is a schematic longitudinal section through a head of the lance according to the invention, while
  • - Fig.2 is a diagram representing the variability of the location of the point of impact of the jet, according to an embodiment of the lance head.

On distingue en fig.1 une partie (sans tuyères secondaires etc.) d'une tête de lance 1 avec des moyens de refroidissement par circu­lation d'eau 2. La tuyère verticale 4 guide un jet d'oxygène d'affi­nage 3, dont les propriétés physiques sont déterminées par la pres­sion de la source d'oxygène, la vanne de réglage du débit et le pro­fil et le dimensionnement des conduits d'oxygène depuis la source jusqu'à la chambre 6 située dans le prolongement de la tuyère 3. Cette chambre 6, qui relie la tuyère 4 à l'embouchure 7 de la lance, a une longueur de quelque 30 cm; elle n'aurait qu'une influence né­gligeable sur la dynamique du jet d'oxygène 3 (légère augmentation de vitesse, fonction de la section d'embouchure 7) s'il n'y avait, au voisinage de l'endroit 9 où la tuyère 4 s'évase dans la chambre 6, l'embouchure 5 de plusieurs conduits latéraux 10. Pour ne pas surcharger la figure, on n'a répresenté qu'un seul conduit latéral, mais dans la variante décrite, il y a huit embouchures 5, disposées symétriquement autour de l'embouchure 9 de la tuyère 4. Ces conduits guident un gaz, qui est de préférence de l'oxygène ou de l'air, de façon que sa direction d'écoulement près de l'embouchure 5 soit pratiquement transversale à celle du jet principal d'oxygène 3. Le débit de gaz, traversant les différents conduits 10 est réglé par l'intermédiaire de vannes 11, qui peuvent être du type on-off.We distinguish in fig.1 a part (without secondary nozzles etc.) of a lance head 1 with cooling means by water circulation 2. The vertical nozzle 4 guides a jet of refining oxygen 3, of which the physical properties are determined by the pressure of the oxygen source, the flow control valve and the profile and dimensioning of the oxygen conduits from the source to the chamber 6 located in the extension of the nozzle 3. This chamber 6, which connects the nozzle 4 to the mouth 7 of the lance, has a length of around 30 cm; it would only have a negligible influence on the dynamics of the oxygen jet 3 (slight increase in speed, function of the mouth section 7) if there were, in the vicinity of the place 9 where the nozzle 4 flares into chamber 6, the mouth 5 of several lateral conduits 10. In order not to overload the figure, only one lateral conduit has been shown, but in the variant described, there are eight mouths 5, arranged symmetrically around the mouth 9 of the nozzle 4. These conduits guide a gas, which is preferably oxygen or air, so that its direction of flow near the mouth 5 is practically transverse to that of the main oxygen jet 3. The gas flow rate, passing through the various conduits 10, is regulated by means of valves 11, which may be of the on-off type.

La chambre 6 présente sensiblement la forme d'une poire, tronquée des côtés supérieur et inférieur. La section de l'embouchure 7 est comparable à celle de l'endroit 9 où la chambre est raccordée à la tuyère 4. Le profil de l'évasement près de la tuyère 4 est peu critique mais doit être assez prononcé pour réaliser sur une distance de quelques dizaines de cm une déviation progressive du jet jusqu'à la déviation A désirée. A l'approche de l'embouchure 7, l'angle que prend le profil intérieur de la chambre avec l'axe longitudinal BBʹ de la tuyère 4 tend vers l'angle de déviation A désiré. Il s'ensuit que le profil intérieur de la chambre 6 est réalisé en tenant compte de la distance embouchure 7 - surface du bain ainsi que des dimensions du convertisseur ou, plus précisément, de la section horizontale du convertisseur à la hauteur normale du niveau du bain. La chambre 6 peut être de révolution où présenter vis à vis de chaque embouchure 5 des rainures dans lesquelles le jet 3 dévié vient se loger. Ces rainures peuvent avoir une profondeur telle qu'elles entourent un tiers de la section du jet 3 et présen­ter éventuellement une disposition en spirale autour de l'axe BBʹ. Dans cette dernière forme d'exécution le corps de lance est le siège, non seulement d'une force de réaction qui passe par l'axe BBʹ, mais également d'un couple de rotation.Chamber 6 has substantially the shape of a pear, truncated on the upper and lower sides. The section of the mouth 7 is comparable to that of the place 9 where the chamber is connected to the nozzle 4. The profile of the flaring near the nozzle 4 is not very critical but must be pronounced enough to achieve over a distance from a few tens of cm a progressive deviation of the jet to the desired deviation A. Approaching the mouth 7, the angle taken by the interior profile of the chamber with the longitudinal axis BBʹ of the nozzle 4 tends towards the desired deflection angle A. It follows that the interior profile of the chamber 6 is produced taking into account the distance from the mouth 7 - surface of the bath as well as the dimensions of the converter or, more precisely, the horizontal section of the converter at the normal height of the level of the bath. The chamber 6 can be of revolution where present opposite each mouth 5 of the grooves in which the deflected jet 3 is housed. These grooves can have a depth such that they surround a third of the section of the jet 3 and possibly have a spiral arrangement around the axis BBʹ. In this latter embodiment, the lance body is the seat, not only of a reaction force which passes through the axis BBʹ, but also of a torque.

Le fonctionnement du dispositif est le suivant: Au départ uniquement la tuyère 4 est reliée à la source d'oxygène, les différentes vannes 11 sont fermées; un jet dur et vertical d'oxygène primaire frappe la surface du bain. Dès qu'une déflection du jet est désirée, une des vannes 11 est actionnée et un jet de gaz pénètre dans la chambre 6, et créé une zone de surpression 8, hachurée. Cette zone de surpression provoque une déviation du jet 3 qui s'appuie, tout en gardant sa forme, contre la paroi de la chambre qui est opposée à l'embouchure 5 qui crée la zone de supression 8. Par suite de phé­nomènes d'aspiration par le jet d'oxygène primaire, la quantité de gaz nécessaire pour créer la poche 8 est substantielle; par contre, dès que le jet de gaz 3 est dévié, il ne faut plus qu'une quantité de gaz minime pour conserver la zone de surpression et maintenir le jet dévié.The operation of the device is as follows: At the start only the nozzle 4 is connected to the oxygen source, the various valves 11 are closed; a hard, vertical jet of primary oxygen hits the surface of the bath. As soon as a deflection of the jet is desired, one of the valves 11 is actuated and a gas jet enters the chamber 6, and creates a hatched overpressure zone 8. This overpressure zone causes a deflection of the jet 3 which bears, while keeping its shape, against the wall of the chamber which is opposite the mouth 5 which creates the suppression zone 8. As a result of aspiration phenomena by the primary oxygen jet, the quantity of gas necessary to create the bag 8 is substantial; on the other hand, as soon as the gas jet 3 is deflected, only a minimal amount of gas is required to maintain the overpressure zone and maintain the deflected jet.

Une forme d'exécution possible prévoit de commander à l'aide d'un ordinateur les différentes vannes 11 en fonction du déroulement du processus d'affinage. En ouvrant, en fonction de la distribution de la température dans le convertisseur (profil de température à la surface du bain et profil de température au-dessus du bain condi­tionné par la combustion du monoxyde de carbone) une à une les dif­férentes vannes 11, on peut promener le point d'impact suivant un trajet plus ou moins circulaire sur la surface du bain. On peut également ouvrir et refermer une après l'autre des vannes 11 à une fréquence préétablie, ce qui aura comme effet de réaliser tantôt un point d'impact central et tantôt un point d'impact qui se déplace sur des segments de cercle autour du centre du bain.One possible embodiment provides for controlling the different valves 11 according to the progress of the refining process using a computer. By opening, depending on the temperature distribution in the converter (temperature profile on the surface of the bath and temperature profile above the bath conditioned by the combustion of carbon monoxide) one by one the different valves 11, we can move the point of impact along a more or less circular path on the surface of the bath. It is also possible to open and close valves 11 one after the other at a preset frequency, which will have the effect of sometimes producing a central impact point and sometimes an impact point which moves on circular segments around the center of the bath.

La fig.2 montre de manière schématique les différents points d'im­pact réalisables sur la surface du bain métallique, grâce à une tête de lance comportant une tuyère verticale dont le jet peut être dévié par huit conduits latéraux 10 tel que décrit plus haut. Le point J₀ est réalisé en gardant les huit vannes 11 fermées. En ouvrant une après l'autre une des vannes 11, il est possible de déplacer le jet pour réaliser par exemple le point d'impact J₁₀, puis J₂₀ etc. Fig.2 shows schematically the different points of impact achievable on the surface of the metal bath, thanks to a lance head comprising a vertical nozzle whose jet can be deflected by eight lateral conduits 10 as described above. Point J₀ is achieved by keeping the eight valves 11 closed. By opening one after the other one of the valves 11, it is possible to move the jet to achieve for example the point of impact J₁₀, then J₂₀ etc.

Ainsi la tête de lance suivant l'invention permet de diriger le jet vers chacun des points d'impact représentés, dans le sens des flèches et on imagine que l'on peut préétablir des programmes de ba­layage de la surface, suivant des schémas empiriques, ou procéder suivant une situation donnée. On peut p.ex. constater qu'il s'est formé un loup dans le convertisseur dans une zone déterminée; en procédant à un balayage intense à l'oxygène dans cette zone, on peut faire fondre le loup.Thus the lance head according to the invention makes it possible to direct the jet towards each of the impact points represented, in the direction of the arrows and it is imagined that it is possible to pre-establish programs for scanning the surface, according to empirical diagrams, or proceed according to a given situation. We can eg observe that a wolf has formed in the converter in a specific area; by carrying out an intense oxygen scan in this area, the wolf can melt.

Claims (6)

1. Lance pour l'affinage de métaux ou de ferro-alliages par souff­lage d'oxygène par le haut, dont la tête (1) présente l'embou­chure d'au moins une tuyère (4) guidant un jet d'oxygène (3) destiné à l'affinage ayant une vitesse supersonique, caractérisée en ce qu'une chambre (6) est intercalée entre l'embouchure (9) de la dite tuyère (4) et l'embouchure (7) de la tête de lance, la chambre (6) s'évasant progressivement depuis l'embouchure (9) de la dite tuyère (4) pour se rétrécir vers l'embouchure (7) de la tête de lance, en ce qu'au moins une embouchure (5) d'au moins un conduit latéral (10) aboutit dans la chambre (6), au voisinage de l'embouchure (9) de la dite tuyère (4) et en ce que chacun des conduits latéraux (10) est relié à une source de gaz et comporte une vanne individuelle (11) de régulation de débit.1. Lance for refining metals or ferro-alloys by blowing oxygen from above, the head (1) of which has the mouth of at least one nozzle (4) guiding an oxygen jet (3 ) intended for refining having a supersonic speed, characterized in that a chamber (6) is interposed between the mouth (9) of said nozzle (4) and the mouth (7) of the lance head, the chamber (6) widening gradually from the mouth (9) of said nozzle (4) in order to narrow towards the mouth (7) of the lance head, in that at least one mouth (5) at least one lateral conduit (10) ends in the chamber (6), in the vicinity of the mouth (9) of said nozzle (4) and in that each of the lateral conduits (10) is connected to a source gas and comprises an individual valve (11) for regulating flow. 2. Lance suivant la revendication 1, caractérisée en ce qu'au moins trois conduits latéraux (10) sont disposés symétriquement autour de l'embouchure (9) de la dite tuyère (4).2. Lance according to claim 1, characterized in that at least three lateral conduits (10) are arranged symmetrically around the mouth (9) of said nozzle (4). 3. Lance suivant les revendications 1 ou 2, caractérisée en ce que la chambre (6) est de révolution et présente sensiblement la forme d'une poire tronquée du côté supérieur et inférieur.3. Lance according to claims 1 or 2, characterized in that the chamber (6) is of revolution and has substantially the shape of a truncated pear on the upper and lower side. 4. Lance suivant les revendications 1 ou 2, caractérisée en ce que la paroi intérieure de la chambre (6) est munie de rainures.4. Lance according to claims 1 or 2, characterized in that the inner wall of the chamber (6) is provided with grooves. 5. Lance suivant une des revendications 1 à 3, caractérisée en ce que le profil intérieur de la chambre (6) est dimensionné de manière à ce que l'angle du profil, à la sortie de la tête, correspond à l'angle (A) de déviation du jet, tel que désiré.5. Lance according to one of claims 1 to 3, characterized in that the interior profile of the chamber (6) is dimensioned so that the angle of the profile, at the outlet of the head, corresponds to the angle ( A) deflection of the jet, as desired. 6. Lance suivant une des revendications 1 à 4, caractérisée en ce que l'embouchure (9) de la dite tuyère (4) et l'embouchure (7) de la tête de lance ont des dimensions comparables.6. Lance according to one of claims 1 to 4, characterized in that the mouth (9) of said nozzle (4) and the mouth (7) of the lance head have comparable dimensions.
EP87101776A 1986-02-25 1987-02-09 Lance for blowing oxygen Expired - Lifetime EP0234388B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87101776T ATE71151T1 (en) 1986-02-25 1987-02-09 OXYGEN BLOWING LANCE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU86321 1986-02-25
LU86321A LU86321A1 (en) 1986-02-25 1986-02-25 OXYGEN BLOWING LANCE

Publications (3)

Publication Number Publication Date
EP0234388A2 true EP0234388A2 (en) 1987-09-02
EP0234388A3 EP0234388A3 (en) 1989-04-19
EP0234388B1 EP0234388B1 (en) 1992-01-02

Family

ID=19730646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101776A Expired - Lifetime EP0234388B1 (en) 1986-02-25 1987-02-09 Lance for blowing oxygen

Country Status (10)

Country Link
US (1) US4730813A (en)
EP (1) EP0234388B1 (en)
JP (1) JPH0811807B2 (en)
AT (1) ATE71151T1 (en)
AU (1) AU580470B2 (en)
BR (1) BR8700868A (en)
CA (1) CA1323756C (en)
DE (1) DE3775574D1 (en)
ES (1) ES2028800T3 (en)
LU (1) LU86321A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0364721A1 (en) * 1988-09-28 1990-04-25 Arbed S.A. Refining lance
EP0490101A1 (en) * 1990-12-10 1992-06-17 Arbed S.A. Blast pipe
AU704661B2 (en) * 1995-06-07 1999-04-29 Schneider Electric Sa A device for assembly and electrical connection of modular apparatuses such as circuit breakers or similar

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0209365D0 (en) * 2002-04-24 2002-06-05 Boc Group Plc Injection of solids into liquids
GB0213376D0 (en) * 2002-06-11 2002-07-24 Boc Group Plc Refining ferroalloys
JP5412756B2 (en) * 2008-07-22 2014-02-12 Ｊｆｅスチール株式会社 Converter operation method

Citations (5)

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FR1237740A (en) * 1959-05-22 1960-08-05 Siderurgie Fse Inst Rech Adjustable insufflation lance for fine particles in suspension
FR1346214A (en) * 1963-02-02 1963-12-13 Demag Ag Lance for blowing oxygen especially in steel refining furnaces or converters
DE2420246B1 (en) * 1974-04-26 1975-06-05 Stahlwerke Peine-Salzgitter Ag, 3150 Peine Oxygen blast converter control - with fluidic control modules for amplitude/pattern of each jet from multi nozzle lance
EP0018935A1 (en) * 1979-04-30 1980-11-12 Arbed S.A. Process for refining a metal bath containing solid cooling substances
EP0109916A1 (en) * 1982-10-22 1984-05-30 MecanARBED Dommeldange S.à r.l. Apparatus for delivering gaseous and solid materials to a bath of molten metal by way of refining

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US1873996A (en) * 1932-03-23 1932-08-30 Patrick P Cunningham Tuyere
US3207597A (en) * 1961-10-19 1965-09-21 Yawata Iron & Steel Co Method of adding a liquid fuel to the air blast in a shaft furnace or specifically in a blast furnace
CA960856A (en) * 1970-11-16 1975-01-14 Edward T.C. Johnstone Method and apparatus for feeding particulate materials to furnaces and the like
SU517638A1 (en) * 1975-02-10 1976-06-15 Новолипецкий Ордена Ленина Металлургический Завод Blast Furnace Tuyere
SU817056A1 (en) * 1979-06-05 1981-03-30 Днепропетровский Ордена Трудовогокрасного Знамени Металлургическийинститут Tuyere of blast furnace
SU1011699A1 (en) * 1980-05-13 1983-04-15 Череповецкий Ордена Ленина И Ордена Трудового Красного Знамени Металлургический Завод Им.50-Летия Ссср Nozzle for blowing tuyere of steel smelting unit
SU908812A1 (en) * 1980-07-28 1982-02-28 Донецкий научно-исследовательский институт черной металлургии Blasting tuyere for blast furnace
LU82846A1 (en) * 1980-10-13 1982-05-10 Arbed OXYGEN BLOWING LANCE
LU83814A1 (en) * 1981-12-04 1983-09-01 Arbed METHOD AND DEVICE FOR REFINING A METAL BATH CONTAINING SOLID COOLING MATERIALS
JPS58185707A (en) * 1982-04-23 1983-10-29 Sumitomo Metal Ind Ltd Refining method of steel
DE3509795C1 (en) * 1985-03-19 1986-06-05 Klöckner CRA Technologie GmbH, 4100 Duisburg Water-cooled blowing lance for blowing oxygen onto a molten metal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1237740A (en) * 1959-05-22 1960-08-05 Siderurgie Fse Inst Rech Adjustable insufflation lance for fine particles in suspension
FR1346214A (en) * 1963-02-02 1963-12-13 Demag Ag Lance for blowing oxygen especially in steel refining furnaces or converters
DE2420246B1 (en) * 1974-04-26 1975-06-05 Stahlwerke Peine-Salzgitter Ag, 3150 Peine Oxygen blast converter control - with fluidic control modules for amplitude/pattern of each jet from multi nozzle lance
EP0018935A1 (en) * 1979-04-30 1980-11-12 Arbed S.A. Process for refining a metal bath containing solid cooling substances
EP0109916A1 (en) * 1982-10-22 1984-05-30 MecanARBED Dommeldange S.à r.l. Apparatus for delivering gaseous and solid materials to a bath of molten metal by way of refining

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0364721A1 (en) * 1988-09-28 1990-04-25 Arbed S.A. Refining lance
EP0490101A1 (en) * 1990-12-10 1992-06-17 Arbed S.A. Blast pipe
AU644486B2 (en) * 1990-12-10 1993-12-09 Arbed S.A. Top blowing refining lance
AU704661B2 (en) * 1995-06-07 1999-04-29 Schneider Electric Sa A device for assembly and electrical connection of modular apparatuses such as circuit breakers or similar

Also Published As

Publication number Publication date
AU6925187A (en) 1987-08-27
CA1323756C (en) 1993-11-02
EP0234388A3 (en) 1989-04-19
US4730813A (en) 1988-03-15
BR8700868A (en) 1987-12-22
DE3775574D1 (en) 1992-02-13
JPH0811807B2 (en) 1996-02-07
ATE71151T1 (en) 1992-01-15
EP0234388B1 (en) 1992-01-02
AU580470B2 (en) 1989-01-12
ES2028800T3 (en) 1992-07-16
JPS62205213A (en) 1987-09-09
LU86321A1 (en) 1987-09-10

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