EP0336109A1 - Tuyere for refining lances - Google Patents

Tuyere for refining lances Download PDF

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Publication number
EP0336109A1
EP0336109A1 EP89103569A EP89103569A EP0336109A1 EP 0336109 A1 EP0336109 A1 EP 0336109A1 EP 89103569 A EP89103569 A EP 89103569A EP 89103569 A EP89103569 A EP 89103569A EP 0336109 A1 EP0336109 A1 EP 0336109A1
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EP
European Patent Office
Prior art keywords
nozzle according
lance
mouth
sharp edges
oxygen
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Granted
Application number
EP89103569A
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German (de)
French (fr)
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EP0336109B1 (en
Inventor
Romain Henrion
Henri Klein
François Knaff
Robert Mousel
Michel Decker
Carlo Heintz
Carlo Lux
Patrick Derungs
Henri Hoerold
André Bock
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Paul Wurth SA
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Arbed SA
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Priority to AT89103569T priority Critical patent/ATE79412T1/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
    • C21C5/48—Bottoms or tuyéres of converters
    • 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
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/305—Afterburning

Definitions

  • the present invention relates to a nozzle for a refining lance and in particular a nozzle for supplying post-combustion oxygen to the space situated above a metal bath in the process of refining.
  • Refining lances which have, apart from the vertical nozzles supplying the supersonic oxygen for refining, several auxiliary nozzles, inclined between 25 ° and 60 ° (see for example the patents LU 78 906 and LU 83 814) by relative to the vertical axis, delivering oxygen jets used for post-combustion. Since these oxygen jets are subsonic, the auxiliary nozzles are supplied by an independent oxygen circuit which allows flow regulation. It is also known (see patent LU 82 846) to provide the conduits of the nozzles which guide the afterburner oxygen, with means for increasing the degree of turbulence of the jet.
  • These means may consist of sheets placed in the conduits of the secondary nozzles so as to form spirals; in another embodiment, the walls of the conduits are provided with grooves which can be either circular and arranged in a plane perpendicular to the axis of the conduit, or spiral.
  • the angles of inclination of the afterburning oxygen jets are imposed by those of the nozzles; once determined by empirical tests or methods (taking into account the inclinations of the primary oxygen jets, their arrangement, the dimensions of the converter, the height of the lance head above the bath, etc.), these angles remain constant.
  • These nozzles do not allow to sweep the space above the bath with jets of oxygen, nor send the post-combustion oxygen into the converter at an angle depending on the refining phase in progress.
  • Patent LU 86 329 describes a supersonic nozzle supplying post-combustion oxygen under variable inclination to the space above a metal bath. It has a wall along which the gas flows in a straight line before reaching a sharp edge, constituting a part of the mouth. It is at the height of the summit of this pointed edge that the jet relaxes and is deflected.
  • the deflection angle varies as a function of the gas pressure at the edge, i.e. the higher the gas pressure, the greater the deflection angle; on the other hand the deflection effect by the edge is practically zero when the gas has a subsonic speed there.
  • the object of the present invention is to propose a nozzle which makes it possible to create a practically homogeneous layer of oxygen above the metal bath of the converter.
  • a pressure sensor (not shown) measures the actual pressure P at the inlet of one of the nozzles. This pressure P is compared to a set pressure Po and in the event of a difference a regulation loop acts on the degree of opening of the valve.
  • the pressure Po is determined by routine tests so as to have a deflection such that the space around the mouth is uniformly supplied with oxygen.
  • a nozzle 3 When a nozzle 3 is fed under a pressure which increases from zero pressure, the gas jet exits at an increasing speed. From a limit pressure, depending on the construction details of the nozzle, the speed of the gas at the outlet becomes sonic. Additional increases in the supply pressure no longer act on the speed of the gas at the outlet which remains sonic, but increase its internal pressure.
  • the jet relaxes while being the seat of a multitude of shock waves which are at the basis of an increase in jet speed and its bilateral deflection.
  • the deflection angle varies depending on the gas pressure at the mouth, i.e.
  • the afterburner nozzles have an inclination of a few tens of degrees relative to the vertical axis and that, at the limit, they are arranged in a circle surrounding the refining nozzles, on the in front of the spear.
  • the oxygen layer instead of being horizontal as in the case of fig. 1, will be inclined towards the surface of the metal bath by sketching a shape comparable to that of an open three-quarter umbrella.
  • all the carbon monoxide leaving the bath must pass through the bound layer of oxygen before reaching the chimney.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Jellies, Jams, And Syrups (AREA)
  • Nozzles (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Tuyere for a refining lance arranged set back from the lance head and supplying afterburning oxygen to the space situated above a bath of metal which is being refined. The tuyere (21) has a mouthpiece which has parallel sharp ridges (33) arranged in planes passing substantially through the axis of the lance (20), which are connected by slightly rounded ridges. Upstream of the mouthpiece of the tuyere (21) a convergent part (32) is provided. <IMAGE>

Description

La présente invention concerne une tuyère pour lance d'affinage et en particulier une tuyère pour fournir de l'oxygène de postcombus­tion à l'espace situé au-dessus d'un bain métallique en voie d'affi­nage.The present invention relates to a nozzle for a refining lance and in particular a nozzle for supplying post-combustion oxygen to the space situated above a metal bath in the process of refining.

On connaît des lances d'affinage qui possèdent, en dehors des tuy­ères verticales fournissant l'oxygène supersonique d'affinage, plusieurs tuyères auxilières, inclinées entre 25° et 60° (voir par exemple les brevets LU 78 906 et LU 83 814) par rapport à l'axe vertical, débitant des jets d'oxygène servant à la postcombustion. Etant donné que ces jets d'oxygène sont subsoniques, les tuyères auxiliaires sont alimentées par un circuit d'oxygène indépendant qui permet une régulation en débit. Il est également connu (voir le brevet LU 82 846) de munir les conduits des tuyères qui guident l'oxygène de postcombustion, de moyens pour augmenter le degré de turbulence du jet. Ces moyens peuvent consister en des tôles dis­posées dans les conduits des tuyères secondaires de manière à former des spirales; dans une autre forme d'exécution, on munit les parois des conduits de rainures qui peuvent être soit circulaires et dis­posées dans un plan perpendiculaire à l'axe du conduit, soit spira­lées. Les angles d'inclinaison des jets d'oxygène de postcombustion sont imposés par ceux des tuyères; une fois déterminés par des essais ou des méthodes empiriques (tenant compte des inclinaisons des jets d'oxygène primaire, de leur disposition, des dimensions du convertisseur, de la hauteur de la tête de lance au-dessus du bain, etc.), ces angles restent constants. Ces tuyères ne permettent ni de balayer l'espace au-dessus du bain avec des jets d'oxygène, ni d'envoyer l'oxygène de postcombustion dans le convertisseur sous un angle fonction de la phase d'affinage en cours.Refining lances are known which have, apart from the vertical nozzles supplying the supersonic oxygen for refining, several auxiliary nozzles, inclined between 25 ° and 60 ° (see for example the patents LU 78 906 and LU 83 814) by relative to the vertical axis, delivering oxygen jets used for post-combustion. Since these oxygen jets are subsonic, the auxiliary nozzles are supplied by an independent oxygen circuit which allows flow regulation. It is also known (see patent LU 82 846) to provide the conduits of the nozzles which guide the afterburner oxygen, with means for increasing the degree of turbulence of the jet. These means may consist of sheets placed in the conduits of the secondary nozzles so as to form spirals; in another embodiment, the walls of the conduits are provided with grooves which can be either circular and arranged in a plane perpendicular to the axis of the conduit, or spiral. The angles of inclination of the afterburning oxygen jets are imposed by those of the nozzles; once determined by empirical tests or methods (taking into account the inclinations of the primary oxygen jets, their arrangement, the dimensions of the converter, the height of the lance head above the bath, etc.), these angles remain constant. These nozzles do not allow to sweep the space above the bath with jets of oxygen, nor send the post-combustion oxygen into the converter at an angle depending on the refining phase in progress.

Le brevet LU 86 329 décrit une tuyère supersonique fournissant l'oxygène de postcombustion sous inclinaison variable à l'espace au-­dessus d'un bain métallique. Elle comporte une paroi le long de laquelle le gaz s'écoule en ligne droite avant d'aboutir à une arête aiguë, constituant une partie de l'embouchure. C'est à la hauteur du sommet de cette arête pointue que le jet se détend et est dévié. L'angle de déflection varie en fonction de la pression du gaz au niveau de l'arête c.à d. plus la pression du gaz y est élevée, plus l'angle de déflection est important; par contre l'effet de déflec­tion par l'arête est pratiquement nul lorsque le gaz y possède une vitesse subsonique. En variant la pression du gaz alimentant la tuyère entre des limites préétablies, on arrive à balayer un angle qui se rapproche de quelque 30°; les turbulences qui en résultent dans le convertisseur favorisent la création d'une zone étendue, alimentée en permanence par de l'oxygène. Bien que cette tuyère possède un taux de postcombustion supérieur à celui des tuyères classiques, elle reste perfectible. En effet suite à des contraintes constructives -place disponible dans la tête de lance- il n'est pas possible de disposer ces tuyères sur tout le pourtour de la tête de lance, mais seulement en quelques endroits discrets, de sorte que l'espace n'est alimenté que de façon incomplète.Patent LU 86 329 describes a supersonic nozzle supplying post-combustion oxygen under variable inclination to the space above a metal bath. It has a wall along which the gas flows in a straight line before reaching a sharp edge, constituting a part of the mouth. It is at the height of the summit of this pointed edge that the jet relaxes and is deflected. The deflection angle varies as a function of the gas pressure at the edge, i.e. the higher the gas pressure, the greater the deflection angle; on the other hand the deflection effect by the edge is practically zero when the gas has a subsonic speed there. By varying the pressure of the gas supplying the nozzle between pre-established limits, we manage to sweep an angle which approximates some 30 °; the resulting turbulence in the converter promotes the creation of a large area, permanently supplied with oxygen. Although this nozzle has a higher afterburner rate than conventional nozzles, it remains perfectible. In fact, following constructive constraints - space available in the lance head - it is not possible to have these nozzles around the entire periphery of the lance head, but only in a few discrete places, so that the space n 'is only partially supplied.

La présente invention a comme but de proposer une tuyère qui permet de créer une couche pratiquement homogène d'oxygène au-dessus du bain métallique du convertisseur.The object of the present invention is to propose a nozzle which makes it possible to create a practically homogeneous layer of oxygen above the metal bath of the converter.

Ce but est atteint par la tuyère selon l'invention telle qu'elle est caractérisée dans les revendications indépendantes. Des variantes préférentielles sont décrites dans les revendications dépendantes.This object is achieved by the nozzle according to the invention as characterized in the independent claims. Preferential variants are described in the dependent claims.

L'invention sera expliquée plus en détail à l'aide de dessins qui en montrent des formes d'exécution possibles:

  • - la fig. 1 présente de manière schématique une lance d'affinage munie des tuyères selon l'invention,
  • - la fig. 2 une variante d'une lance d'affinage selon l'invention,
  • - la fig. 3 une coupe à travers la fig. 2 selon la ligne III-III et
  • - la fig. 4 une coupe à travers deux tuyères voisines exécutées selon une autre variante.
The invention will be explained in more detail using drawings which show possible embodiments:
  • - fig. 1 schematically presents a refining lance provided with the nozzles according to the invention,
  • - fig. 2 a variant of a refining lance according to the invention,
  • - fig. 3 a section through fig. 2 along line III-III and
  • - fig. 4 a section through two adjacent nozzles executed according to another variant.

On distingue en fig. 1 le corps de la lance 1 ainsi que trois jets d'oxygène d'affinage 2 sortant de la tête de lance. En retrait de la tête de lance, à une distance de quelques dizaines de centimètres, se trouvent les embouchures 3 de plusieurs tuyères disposées tout autour du corps de lance et fournissant l'oxygène de postcombustion. Ces tuyères possèdent en amont de leur embouchure un col (faculta­tif) précédé par un convergent. Les côtés verticaux de l'embouchure possèdent des arêtes vives sinon aigües alors que les côtés disposés horizontalement sont de préférence arrondis. Toutes ces tuyères peuvent être alimentées en parallèle à partir d'une source d'oxygène et d'une vanne unique réductrice de la pression (non représentée). Il faudra veiller à dimensionner les conduits d'amenée de manière à éviter des différences de pression (pertes de charge différen­tielles) entre les tuyères et également entre différents endroits d'une embouchure. Un capteur de pression (non représenté) mesure la pression réelle P à l'entrée d'une des tuyères. Cette pression P est comparée à une pression de consigne Po et en cas de différence une boucle de régulation agit sur le degré d'ouverture de la vanne.We can see in fig. 1 the body of the lance 1 and three refining oxygen jets 2 leaving the lance head. Set back from the lance head, at a distance of a few tens of centimeters, are the mouths 3 of several nozzles arranged all around the lance body and supplying post-combustion oxygen. These nozzles have upstream of their mouth a neck (optional) preceded by a convergent. The vertical sides of the mouth have sharp edges if not sharp while the horizontally arranged sides are preferably rounded. All these nozzles can be supplied in parallel from an oxygen source and a single pressure reducing valve (not shown). Care should be taken to size the supply pipes so as to avoid pressure differences (differential pressure losses) between the nozzles and also between different places of a mouth. A pressure sensor (not shown) measures the actual pressure P at the inlet of one of the nozzles. This pressure P is compared to a set pressure Po and in the event of a difference a regulation loop acts on the degree of opening of the valve.

La pression Po est déterminée par des essais de routine de manière à avoir une déflection telle que l'espace avoisant de l'embouchure, soit approvisionné uniformément en oxygène. Lorsqu'on alimente une tuyère 3 sous une pression qui va en s'élevant depuis une pression nulle, le jet gazeux sort à une vitesse qui augmente. A partir d'une pression limite, fonction des détails constructifs de la tuyère, la vitesse du gaz à la sortie devient sonique. Des augmentations supplémentaires de la pression d'alimentation n'agissent plus sur la vitesse du gaz à la sortie qui reste sonique, mais élèvent sa pression interne. A la hauteur de l'embouchure, le jet se détend tout en étant le siège d'une multitude d'ondes de choc qui sont à la base d'une augmentation de vitesse du jet et de sa déviation bilatérale. L'angle de déflection varie en fonction de la pression du gaz au niveau de l'embouchure, c.à d. plus la pression du gaz y est élevée, plus la déviation - et la quantité de gaz déviée - est importante; par voie de conséquence le rapport des quantités de gaz qui sortent en ligne droite de la tuyère et de celles qui sont déviées des deux côtés latéraux des tuyères diminue. Il apparaît qu'il y a une plage de pression à l'intérieur de laquelle on obtient l'approvisionnement le plus uniforme de l'espace en regard d'une tuyère. Il existe évidemment aussi une déviation du jet autour des côtés supérieur et inférieur de l'embouchure; comme ces côtés sont de faible largeur et légèrement arrondis, l'effet est peu prononcé. Au vu de la vitesse élevée sous laquelle les jets d'oxygène sortent des tuyères en direction du revêtement réfractaire, on pourrait s'attendre à une usure rapide de celui-ci. Or rien de tel n'a été observé; il semble que le jet n'atteint pas le réfractaire par suite d'un freinage dû à une interaction de la détente du jet avec les ondes de choc; les turbulences qui en résultent sont favorables à une combustion du monoxyde de carbone.The pressure Po is determined by routine tests so as to have a deflection such that the space around the mouth is uniformly supplied with oxygen. When a nozzle 3 is fed under a pressure which increases from zero pressure, the gas jet exits at an increasing speed. From a limit pressure, depending on the construction details of the nozzle, the speed of the gas at the outlet becomes sonic. Additional increases in the supply pressure no longer act on the speed of the gas at the outlet which remains sonic, but increase its internal pressure. At the height of the mouth, the jet relaxes while being the seat of a multitude of shock waves which are at the basis of an increase in jet speed and its bilateral deflection. The deflection angle varies depending on the gas pressure at the mouth, i.e. the higher the gas pressure, the greater the deviation - and the amount of gas deflected -; as a consequence the ratio of the quantities of gases which exit in a straight line from the nozzle and those which are diverted from the two lateral sides of the nozzles decreases. It appears that there is a pressure range within which the most uniform supply of space is obtained opposite a nozzle. There is obviously also a deflection of the jet around the upper and lower sides of the mouth; as these sides are narrow and slightly rounded, the effect is not very pronounced. In view of the high speed at which the oxygen jets exit the nozzles in the direction of the refractory lining, one would expect rapid wear thereof. Nothing of the kind has been observed; it seems that the jet does not reach the refractory as a result of braking due to an interaction of the relaxation of the jet with the shock waves; the resulting turbulence is favorable for combustion of carbon monoxide.

Par suite de contraintes constructives, il n'est dans beaucoup de cas pas faisable de disposer les tuyères de postcombustion tel que montré en fig. 1. Il est cependant possible de modifier une tête de lance 20 standard (voir fig. 2) avec trous de postcombustion ronds 21 - prévue pour un soufflage subsonique - pour qu'elle crée une couche d'oxygène telle que préconisée par l'invention. A cet effet on introduit de l'extérieur dans les trous des pièces d'insertion 31 qui réalisent une région convergente et un col et modifient l'embou­chure de manière à avoir des arêtes vives 33 verticales et paral­lèles. Ces arêtes, distantes par exemple d'un centimètre, sont reliées en haut et en bas par des parties courbes épousant le profil des trous d'origine. Bien que la section du trou de soufflage soit fortement diminuée par le montage des pièces 31, la quantité de gaz soufflée dans l'espace est néanmoins augmentée, étant donné que le soufflage se fait à vitesse supersonique.Due to constructive constraints, it is in many cases not feasible to have the afterburner nozzles as shown in FIG. 1. It is however possible to modify a standard lance head 20 (see fig. 2) with round afterburner holes 21 - intended for subsonic blowing - so that it creates an oxygen layer as recommended by the invention . To this end, inserts 31 are introduced from the outside into the holes, which produce a converging region and a neck and modify the mouth so as to have sharp edges 33 vertical and parallel. These edges, separated for example by one centimeter, are connected at the top and bottom by curved parts matching the profile of the original holes. Although the cross-section of the blowing hole is greatly reduced by the mounting of the parts 31, the quantity of gas blown into the space is nevertheless increased, since the blowing takes place at supersonic speed.

Il va sans dire que lorsqu'on alimente des tuyères classiques de postcombustion sous une pression telle que le jet d'oxygène devient supersonique à la sortie, il y a également déviation autour des embouchures, mais celle-ci n'est pas préférentielle; le jet ne fait que diverger autour de l'axe de soufflage - avec angle de divergence proportionnel à la pression - sans fournir avec les jets avoisinants une couche gazeuse liée, voire homogène.It goes without saying that when supplying conventional nozzles of post-combustion under pressure such that the oxygen jet becomes supersonic at the outlet, there is also a deflection around the mouths, but this is not preferred; the jet only diverts around the blowing axis - with an angle of divergence proportional to the pressure - without providing with the neighboring jets a bound, even homogeneous, gas layer.

Notons qu'il n'est pas trop gênant que les tuyères de postcombustion possèdent une inclinaison de quelques dizaines de degrés par rapport à l'axe vertical et qu'à la limite elles soient disposées en cercle entourant les tuyères d'affinage, sur le devant de la lance. La couche d'oxygène, au lieu d'être horizontale comme dans le cas de la fig.1, sera inclinée vers la surface du bain métallique en ébauchant une allure comparable à celle d'un parapluie aux trois-quarts ouvert. Dans la disposition des tuyères décrite en rapport avec la fig.1, tout le monoxyde de carbone sortant du bain doit traverser la couche liée d'oxygène avant d'atteindre la cheminée. Dans cette variante, comme les jets visent le bain, une partie du CO sortant du bain à l'extérieur de la surface délimitée par la couche inclinée d'oxygène, ne sera pas brûlée; cependant cette quantité ne repré­sente qu'une faible partie de la quantité totale. L'essentiel est que la combustion se fait dans ce cas à plus faible distance du bain, d'où meilleur rendement thermique.Note that it is not too annoying that the afterburner nozzles have an inclination of a few tens of degrees relative to the vertical axis and that, at the limit, they are arranged in a circle surrounding the refining nozzles, on the in front of the spear. The oxygen layer, instead of being horizontal as in the case of fig. 1, will be inclined towards the surface of the metal bath by sketching a shape comparable to that of an open three-quarter umbrella. In the arrangement of the nozzles described in connection with fig. 1, all the carbon monoxide leaving the bath must pass through the bound layer of oxygen before reaching the chimney. In this variant, as the jets target the bath, part of the CO leaving the bath outside the surface delimited by the inclined layer of oxygen, will not be burned; however, this quantity represents only a small part of the total quantity. The main thing is that combustion takes place in this case at a shorter distance from the bath, hence better thermal efficiency.

Lorsque les tuyères de postcombustion ne sont pas distribuées uni­formément sur le pourtour de la tête de lance, mais groupées deux par deux, il est conseillé de modifier l'axe de soufflage des tuyères de sorte à obtenir une meilleure distribution de l'oxygène dans l'espace entre deux paires de tuyères. En fig. 4 une telle paire de tuyères 43 a été représentée. Les pièces d'insertion 41 présentent uniquement une partie convergente, sans col et modifient l'axe de soufflage 42 de la tuyère en direction des paires de tuyères avoisinantes. En supplément à cet artifice, il y a possibi­lité de reporter les arêtes du côté de l'embouchure avoisinant les autres paires de tuyères, vers l'intérieur du corps (voir ref; 44) de manière à provoquer de ces côtés une déviation du jet avant sa sortie de la tête de lance.When the afterburner nozzles are not distributed uniformly around the edge of the lance head, but grouped two by two, it is advisable to modify the blowing axis of the nozzles so as to obtain a better distribution of the oxygen in the space between two pairs of nozzles. In fig. 4 such a pair of nozzles 43 has been shown. The inserts 41 have only a converging part, without a neck and modify the blowing axis 42 of the nozzle in the direction of the neighboring pairs of nozzles. In addition to this device, it is possible to transfer the edges on the side of the mouth adjacent to the other pairs of nozzles, towards the inside of the body (see ref; 44) so as to cause these sides to deflect the jet. before coming out of the spear head.

Claims (10)

1. Tuyère pour lance d'affinage et en particulier tuyère pour fournir l'oxygène de postcombustion à l'espace situé au-dessus d'un bain métallique en voie d'affinage, située dans le prolonge­ment d'un conduit d'amenée de gaz la reliant par l'intermédiaire d'une vanne réductrice de pression à une source d'oxygène, possédant une embouchure et en amont de cette embouchure une partie convergente et éventuellement un col, caractérisée en ce que cette embouchure présente deux arêtes vives allongées, parallèles, disposées dans des plans passant sensiblement par l'axe de la lance et reliées en haut et en bas par des arêtes qui sont de préférence légèrement arrondies.1. Nozzle for refining lance and in particular nozzle for supplying post-combustion oxygen to the space situated above a metal bath in the process of refining, situated in the extension of a supply duct of gas connecting it via a pressure reducing valve to a source of oxygen, having a mouth and upstream of this mouth a converging part and possibly a neck, characterized in that this mouth has two elongated sharp edges, parallel, arranged in planes passing substantially through the axis of the lance and connected at the top and bottom by edges which are preferably slightly rounded. 2. Tuyère selon la revendication 1, caractérisée en ce que le rapport des longueurs entre les arêtes vives allongées et celles les reliant en haut et en bas, est au moins égal à trois.2. Nozzle according to claim 1, characterized in that the ratio of the lengths between the elongated sharp edges and those connecting them up and down, is at least equal to three. 3. Tuyère selon la revendication 1, caractérisée en ce que les deux arêtes vives sont au plus distantes de 15 mm.3. Nozzle according to claim 1, characterized in that the two sharp edges are at most 15 mm apart. 4. Tuyère selon la revendication 1, caractérisée en ce que les arêtes vives forment un angle de 90°.4. Nozzle according to claim 1, characterized in that the sharp edges form an angle of 90 °. 5. Tuyère selon la revendication 1, caractérisée en ce qu'une des arêtes vives est aiguë, l'autre obtue.5. Nozzle according to claim 1, characterized in that one of the sharp edges is sharp, the other obtuse. 6. Tuyère selon la revendication 1, caractérisée en ce qu'une des arêges vives est disposée en retrait par rapport à l'autre arête.6. Nozzle according to claim 1, characterized in that one of the sharp edges is set back relative to the other edge. 7. Tuyère selon une des revendications 1 à 6, caractérisée en ce que le pression du gaz au niveau de l'embouchure est au moins égale à 200.000 Pascal.7. Nozzle according to one of claims 1 to 6, characterized in that the gas pressure at the mouth is at least equal to 200,000 Pascal. 8. Tuyère selon une des revendications 1 à 7, caractérisée en ce les deux arêtes vives allongées sont parallèles à l'axe de la lance.8. Nozzle according to one of claims 1 to 7, characterized in that the two elongated sharp edges are parallel to the axis of the lance. 9. Tuyère selon une des revendications 1 à 7, caractérisée en ce que son axe est incliné jusqu'à 50° par rapport à l'axe de la lance.9. Nozzle according to one of claims 1 to 7, characterized in that its axis is inclined up to 50 ° relative to the axis of the lance. 10. Tuyère selon une des revendications 1 à 9, caractérisée en ce qu'un col est disposé entre le convergent et l'embouchure.10. Nozzle according to one of claims 1 to 9, characterized in that a neck is disposed between the convergent and the mouth.
EP89103569A 1988-03-11 1989-03-01 Tuyere for refining lances Expired - Lifetime EP0336109B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89103569T ATE79412T1 (en) 1988-03-11 1989-03-01 NOZZLE FOR FRESH LANES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87156A LU87156A1 (en) 1988-03-11 1988-03-11 NOZZLE FOR REFINING LANCE
LU87156 1988-03-11

Publications (2)

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EP0336109A1 true EP0336109A1 (en) 1989-10-11
EP0336109B1 EP0336109B1 (en) 1992-08-12

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US (1) US4971297A (en)
EP (1) EP0336109B1 (en)
JP (1) JP2641287B2 (en)
AT (1) ATE79412T1 (en)
AU (1) AU611777B2 (en)
BR (1) BR8901017A (en)
CA (1) CA1330874C (en)
DE (1) DE68902411T2 (en)
ES (1) ES2034433T3 (en)
LU (1) LU87156A1 (en)

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* 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
US5681526A (en) * 1996-04-23 1997-10-28 Usx Corporation Method and apparatus for post-combustion of gases during the refining of molten metal
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
WO2022074430A1 (en) * 2020-10-06 2022-04-14 Arcelormittal Post combustion lance

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488044A (en) * 1967-05-01 1970-01-06 Nat Steel Corp Apparatus for refining metal
LU78906A1 (en) * 1978-01-19 1979-09-06 Arbed METHOD AND DEVICE FOR REFINING A METAL BATH
GB2085562A (en) * 1980-10-13 1982-04-28 Arbed Oxygen lance for iron refining
EP0081448B1 (en) * 1981-12-04 1986-09-10 Arbed S.A. Process and apparatus for refining a metal bath containing solid cooling materials
EP0234389A2 (en) * 1986-02-28 1987-09-02 Arbed S.A. Tuyere for refining lances

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015481A (en) * 1959-12-11 1962-01-02 Archie H Clingensmith Tuyere assembly
US3627294A (en) * 1970-03-25 1971-12-14 Atlantic Richfield Co Protection sleeve for dip tubes
CA941159A (en) * 1971-01-27 1974-02-05 Boris S. Yarovsky Chaikin Oxygen tuyere of a steel-melting mill
US3972517A (en) * 1974-08-05 1976-08-03 Fedor Vladimirovich Kraizinger Tuyere for introducing reactants into a bath of molten metal
NL8104474A (en) * 1981-10-01 1983-05-02 Estel Hoogovens Bv LIQUID COOLED LANCE FOR BLOWING OXYGEN ON A STEEL BATH.
CA1293121C (en) * 1985-08-20 1991-12-17 Nobuyoshi Takashiba Lance for blow-refinement in converter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488044A (en) * 1967-05-01 1970-01-06 Nat Steel Corp Apparatus for refining metal
LU78906A1 (en) * 1978-01-19 1979-09-06 Arbed METHOD AND DEVICE FOR REFINING A METAL BATH
GB2085562A (en) * 1980-10-13 1982-04-28 Arbed Oxygen lance for iron refining
EP0081448B1 (en) * 1981-12-04 1986-09-10 Arbed S.A. Process and apparatus for refining a metal bath containing solid cooling materials
EP0234389A2 (en) * 1986-02-28 1987-09-02 Arbed S.A. Tuyere for refining lances

Also Published As

Publication number Publication date
EP0336109B1 (en) 1992-08-12
DE68902411D1 (en) 1992-09-17
ES2034433T3 (en) 1993-04-01
BR8901017A (en) 1989-10-24
DE68902411T2 (en) 1992-12-10
JP2641287B2 (en) 1997-08-13
ATE79412T1 (en) 1992-08-15
JPH01275713A (en) 1989-11-06
CA1330874C (en) 1994-07-26
LU87156A1 (en) 1989-10-26
AU611777B2 (en) 1991-06-20
AU3116089A (en) 1989-09-14
US4971297A (en) 1990-11-20

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