EP0339174A1 - Lance for injection or blowing-up with a cooling chamber - Google Patents

Lance for injection or blowing-up with a cooling chamber Download PDF

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Publication number
EP0339174A1
EP0339174A1 EP88870073A EP88870073A EP0339174A1 EP 0339174 A1 EP0339174 A1 EP 0339174A1 EP 88870073 A EP88870073 A EP 88870073A EP 88870073 A EP88870073 A EP 88870073A EP 0339174 A1 EP0339174 A1 EP 0339174A1
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EP
European Patent Office
Prior art keywords
tube
lance
nose
injection
tubes
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.)
Withdrawn
Application number
EP88870073A
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German (de)
French (fr)
Inventor
René Desaar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Recherches Et Developpements Desaar SA
Original Assignee
Recherches Et Developpements Desaar SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Recherches Et Developpements Desaar SA filed Critical Recherches Et Developpements Desaar SA
Priority to EP88870073A priority Critical patent/EP0339174A1/en
Priority to CN 89102848 priority patent/CN1037361A/en
Priority to BR8901996A priority patent/BR8901996A/en
Publication of EP0339174A1 publication Critical patent/EP0339174A1/en
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising

Definitions

  • the present invention relates to a lance for injecting a product or blowing a gas into a liquid metal in steelworks and foundries.
  • An injection or blowing lance essentially consists of a metal injection tube reinforced with an intermediate tube surrounded by a protective sheath made of refractory material over at least part of its length.
  • a protective sheath made of refractory material over at least part of its length.
  • the lances are subjected to significant thermal shocks which produce expansions of the metallic parts embedded in the refractory sheath.
  • thermal shocks it is known (patents BE 837384, BE 849582, DE 2659735 and US 4097030, in particular) to provide the lance with a cooling device intended to circulate a cooling agent in a chamber ring formed between the injection tube and the intermediate tube.
  • the object of the invention is to provide a lance with a cooling chamber arranged so as to promote differential thermal expansion between the metal parts and the refractory sheath.
  • an injection or blowing lance comprising an intermediate tube coaxial with the injection tube and a protective sheath made of refractory material extending over at least part of the length of the lance, the injection tube and the intermediate tube delimiting between them a chamber, this lance being characterized by at least one coolant supply tube extending along and outside the intermediate tube, this supply tube being connected at its upper end to a coolant supply device and communicating at its lower end with the lower part of the cham bre so as to circulate a flow of cooling fluid from top to bottom outside the intermediate tube and from bottom to top in said cooling chamber.
  • the refractory sheath is separated from the metal parts of the lance by an element made of non-expandable material, for example a cardboard tube, preventing the attachment of the refractory material on the metal tubes and allowing a free expansion of these metal tubes under the effect. the high temperature of a bath of molten metal when the lance is immersed in it, without causing cracks in the refractory sheath.
  • the refractory sheath may comprise, embedded in its mass, a metal reinforcing reinforcement which extends practically coaxially around the lance body.
  • the reinforcing reinforcement preferably consists of a mesh structure, the dimensions of the meshes being such that the refractory material coating the reinforcement extends continuously through the meshes so that the refractory essentially forms a monolithic mass. .
  • the end of the lance is advantageously protected by a protective nose made of refractory material, optionally removably attached.
  • a protective nose made of refractory material, optionally removably attached.
  • protective noses are known, for example from BE 904670, EP 0099348 and EP 0116818.
  • the nose comprises a connecting tube which extends in alignment with the tube. injection, the inside diameter of said tube being smaller than the inside diameter of the injection tube tion.
  • connection tube carries several tubes communicating with the conduit of said connection tube, these tubes being distributed around the connection tube and extending in general directions transverse to the axis of the tube, these tubes opening to the outer surface of the nose in order to eject lateral fluid jets so as to balance the reaction exerted on the lance by the ejected fluid.
  • the connecting tube can advantageously be surrounded by a cooling chamber.
  • a metal injection tube suspended by its upper end from a lifting ring 11 to which it is fixed by a nut 12.
  • the tube 1 is used for the passage of a product (material or gas) to be injected or injected into a liquid metal.
  • a product material or gas
  • the injection tube 1 is surrounded by a sliding metal tube 2, the lower end of which is housed in a groove formed in a washer 3 which serves as a support and is welded to the tube.
  • the tube 2 here has a cylindrical shape as shown in FIGS. 2 and 3, but it can also have a prismatic shape as will be described below with the aid of FIG. 4.
  • the space between the tubes 1 and 2 forms a cooling chamber 20 ( Figures 2 and 3).
  • the tube 2 is pierced with at least one opening to which is connected a radial connector 21 which communicates with the conduit of a tube 22 descending along and outside the tube 2.
  • a radial connector 21 which communicates with the conduit of a tube 22 descending along and outside the tube 2.
  • four tubes 22 thus descend along the tube 2 and communicate with the chamber 20.
  • these tubes 22 open in a box 23 into which, on the other hand, leads a pipe 24 for the supply of a cooling agent.
  • the flow of cooling fluid which circulates in the tubes 22 is a flow of cold fluid which leaves the distributor box 23 and first descends practically along the interior surface of the refractory sheath 4, producing a most efficient cooling.
  • the cooling fluid rose along the intermediate tube, it had already been able to heat up somewhat and its effect was therefore less energetic than in the lance according to the present invention.
  • this means consists of a steel wire 25 wound helically around the injection tube over part of the length thereof. This wire has the effect of guiding the cooling fluid in the chamber 20 in a rotating movement which develops from bottom to top, thus slowing the circulation of the flow in the cooling chamber and improving the cooling effect.
  • FIG. 4 illustrates for example another embodiment.
  • the cooling chamber 20 is here limited externally by a tube 2 of square polygonal cross section.
  • the section polygonal cross-section can have any number of sides.
  • the means for slowing down the cooling flow in this example, consists of baffle elements 26 arranged in planes transverse to the longitudinal axis of the injection tube 1 and distributed regularly along the injection tube. In the illustrated embodiment, the elements 26 extend over one half of the cross section of the cooling chamber 20, the successive elements occupying alternating positions so as to provide for the cooling fluid a sinuous passage in the axial direction. of the injection tube.
  • baffle elements could also, for example, all extend over the entire cross section of the cooling chamber and be pierced with orifices which, preferably, are not all in the same alignment in the axial direction. These baffle elements form narrowing of the passage section which forces the cooling fluid to slow down in the cooling chamber.
  • the cooling device also has the advantage that when the lance is used for injecting certain pulverulent products into a bath of liquid metal, it prevents these products from reaching a temperature such that they would turn into a pasty material which would cause generally a blockage of the lance ducts.
  • the metal tubes of the lance are protected by a sheath 4 made of refractory material with the interposition of an element 5 made of non-expandable material under the effect of heat.
  • the sheath 4 is maintained by the pressure of a helical spring 13 acting through the inter median of a spacer 14.
  • the refractory sheath is shown in FIG. 1 in monolithic form, but it could also, in accordance with a known technique, be formed of refractory rings superimposed and joined together by seals. In such an embodiment, the joints obviously constitute weak points where deterioration also occurs.
  • the intermediate element 5 is for example made of a cardboard tube but other non-expandable materials can be used.
  • this non-expandable element has the effect of dissociating the refractory sheath from the metallic element of the lance and shielding it from the influence of expansions of the metallic body while allowing it to expand freely under the effect of the high temperature communicated by the molten metal bath when the lance is immersed in it. Thanks to this separation resulting from the presence of the non-expandable intermediate element, the refractory sheath degrades much less deeply and much less quickly than in a lance according to the prior art. This results in a significant reduction in repairs and replacements, which translates into considerable savings in manpower, immobilization time of the lance and consumption of lances.
  • a reinforcing reinforcement 15 can advantageously be embedded in the refractory mass.
  • the patents BE-837384, BE-849582 and DE-2659735 describe a reinforcing reinforcement consisting of a mesh structure produced from galvanized steel wire. The dimensions of the mesh of the frame 15 are such that the refractory material which coats the reinforcement extends continuously through the meshes and on either side of the reinforcement 15.
  • the refractory sheath 4 also forms a protective nose 6 to ensure balancing of the reaction exerted on the lance by the fluid during its ejection.
  • the injection tube 1 is extended by a metal connection tube 7 welded at its end.
  • the lower end 8 of the tube 7 is closed and the tube 7 carries several tubes 9 which communicate with the conduit of the tube 7 and are arranged so as to open into the external lateral wall of the nose.
  • the connection tube 7 carries for example four pipes 9, but their number can be any. These pipes are used to produce several lateral jets of fluid with the most balanced distribution possible around the longitudinal axis of the tube 7, that is to say the longitudinal axis of the lance.
  • This lateral and balanced arrangement of the outlet pipes is known from patents BE 871590 and BE 904670 for example.
  • the connecting tube 7 has a smaller diameter than that of the injection tube 1 so as to create a higher pressure zone which can act as a buffer and makes it possible to avoid the obstruction of the pipes 9 by re-entry of liquid metal when the fluid pressure drops in the injection tube.
  • Such tubing obstructions were not uncommon in the anterior lance noses, which hampered the smooth running of the technical process. This drawback is eliminated thanks to the present invention.
  • the tubes 9 are straight and oblique with respect to the axis of the lance. It is understood, however, that variant embodiments can be used as described in particular in the aforementioned patents BE 871590 and BE 904670. In particular, the tubes can be curved or be arranged to produce horizontal jets.
  • a reinforcing reinforcement 16 as described for example in patents EP 0099348 and US 4492365.
  • This reinforcing reinforcement can be constituted in a similar manner to the reinforcement 15 of the lance sheath 2 and it can extend this frame by extending coaxially around the connecting tube 7, then extending in a plane transverse to the axis of said tube at a certain distance from the end of this tube.
  • the branches identified by the reference notation 17 are anchoring elements welded to the connecting tube.
  • the protective nose like the body of the lance, can comprise a cooling means: for example a chamber surrounding the connection tube 7.
  • the end of the lance can be protected by a nose screwed onto the injection tube so that it can be replaced without having to replace the entire lance.
  • Various types of removable lance noses are known.
  • the lance nose illustrated by way of example in FIG. 5 is similar to that which is shown in FIG. 1.
  • the upper end of the connection tube 7 comes out of the refractory block of the nose and has a thread 18 intended to cooperate with a similar thread arranged in the interior wall of the injection tube 1.
  • This embodiment combines the advantages of the nose shown in FIG. 1 with those of the removable lance nose.
  • a cooling means can also be provided in the removable protective nose.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Nozzles (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Lance comprising an injection pipe (1), an intermediate pipe (2) coaxial with the injection pipe (1) and a protective sheath (4) of refractory material extending over at least a proportion of the length of the injection pipe (1), the injection pipe (1) and the intermediate pipe (2) defining between them a chamber (20), characterised by at least one delivery pipe for coolant fluid (22) extending along and outside the intermediate pipe (2), this delivery pipe (22) being connected at its upper end to a device for feeding coolant fluid (23) and communicating at its lower end (21) with the lower part of the chamber (20) so as to cause a flow of coolant fluid to travel downwards outside the said intermediate pipe (2) and upwards in the cooling chamber (20). <IMAGE>

Description

La présente invention concerne une lance pour l'injec­tion d'un produit ou le soufflage d'un gaz dans un métal liquide dans les aciéries et les fonderies.The present invention relates to a lance for injecting a product or blowing a gas into a liquid metal in steelworks and foundries.

Une lance d'injection ou de soufflage est constituée essentiellement d'un tube d'injection métallique renforcé d'un tube intermédiaire entouré d'une gaine de protection en matériau réfractaire sur au moins une partie de sa longueur. Pendant leur utilisation, lors­qu'elles sont plongées dans le métal liquide à haute température, les lances sont soumises à des chocs thermiques importants qui produisent des dilatations des parties métalliques noyées dans la gaine réfrac­taire. Pour pallier l'effet de ces chocs thermiques, il est connu (brevets BE 837384, BE 849582, DE 2659735 et US 4097030, notamment) de doter la lance d'un dispositif de refroidissement destiné à faire circuler un agent de refroidissement dans une chambre annulaire ménagée entre le tube d'injection et le tube intermé­diaire.An injection or blowing lance essentially consists of a metal injection tube reinforced with an intermediate tube surrounded by a protective sheath made of refractory material over at least part of its length. During their use, when they are immersed in liquid metal at high temperature, the lances are subjected to significant thermal shocks which produce expansions of the metallic parts embedded in the refractory sheath. To overcome the effect of these thermal shocks, it is known (patents BE 837384, BE 849582, DE 2659735 and US 4097030, in particular) to provide the lance with a cooling device intended to circulate a cooling agent in a chamber ring formed between the injection tube and the intermediate tube.

Dans cette lance connue, au moins un tuyau descend dans la chambre annulaire entre le tube d'injection et le tube intermédiaire afin d'amener l'agent de refroi­dissement jusque dans le bas de la chambre annulaire de manière que, libéré dans cette chambre, il circule de bas en haut en longeant à la fois le tube d'injec­tion et le tube intermédiaire. Grace à cette disposi­tion, les tubes métalliques de la lance se trou­vent refroidis de sorte que la lance est ainsi moins rapidement détériorée sous l'effet des chocs thermiques lors de l'immersion dans un bain de métal liquide. Ce type de lance a une durée de vie sensible­ment plus longue que les lances antérieures non pour­vues d'une chambre de refroidissement.In this known lance, at least one pipe descends into the annular chamber between the injection tube and the intermediate tube in order to bring the coolant to the bottom of the annular chamber so that, released in this chamber, it flows from bottom to top along both the injection tube and the intermediate tube. Thanks to this arrangement, the metal tubes of the lance are cooled so that the lance is thus less rapidly deteriorated under the effect of thermal shock when immersed in a bath of liquid metal. This type of lance has a significantly longer lifespan than previous lances not provided with a cooling chamber.

Cependant, les dilatations des parties métalliques étant supérieures à celles du matériau réfractaire, même avec le dispositif de refroidissement connu il se produit dans le matériau réfractaire des fissurations horizontales et verticales qui détériorent la gaine réfractaire. Ces fissurations du matériau réfractaire dégradent la gaine de protection, ce qui impose de la main-d'oeuvre et des manipulations importantes et qui immobilise les lances pendant des périodes plus ou moins longues.However, the expansions of the metal parts being greater than those of the refractory material, even with the known cooling device, horizontal and vertical cracks occur in the refractory material which deteriorate the refractory sheath. These cracks in the refractory material degrade the protective sheath, which requires labor and significant handling and which immobilizes the lances for more or less long periods.

L'invention a pour but de procurer une lance à chambre de refroidissement agencée de manière à favoriser la dilatation thermique différentielle entre les parties métalliques et la gaine réfractaire.The object of the invention is to provide a lance with a cooling chamber arranged so as to promote differential thermal expansion between the metal parts and the refractory sheath.

Cet objectif est atteint selon l'invention par une lance d'injection ou de soufflage comprenant un tube intermédiaire coaxial au tube d'injection et une gaine de protection en matériau réfractaire s'étendant sur au moins une partie de la longueur de la lance, le tube d'injection et le tube intermédiaire délimitant entre eux une chambre, cette lance étant caractérisée par au moins un tube d'amenée de fluide de refroidis­sement s'étendant le long et à l'extérieur du tube intermédiaire, ce tube d'amenée étant connecté à son extrémité supérieure à un dispositif d'alimentation de fluide de refroidissement et communiquant à son extré­mité inférieure avec la partie inférieure de la cham­ bre de manière à faire circuler un flux de fluide de refroidissement de haut en bas à l'extérieur du tube intermédiaire et de bas en haut dans ladite chambre de refroidissement. Celle-ci contient avantageusement un moyen pour y ralentir la circulation du fluide de refroidissement de manière à améliorer l'effet de refroidissement sur le tube d'injection.This objective is achieved according to the invention by an injection or blowing lance comprising an intermediate tube coaxial with the injection tube and a protective sheath made of refractory material extending over at least part of the length of the lance, the injection tube and the intermediate tube delimiting between them a chamber, this lance being characterized by at least one coolant supply tube extending along and outside the intermediate tube, this supply tube being connected at its upper end to a coolant supply device and communicating at its lower end with the lower part of the cham bre so as to circulate a flow of cooling fluid from top to bottom outside the intermediate tube and from bottom to top in said cooling chamber. This advantageously contains a means for slowing the circulation of the cooling fluid therein so as to improve the cooling effect on the injection tube.

La gaine réfractaire est séparée des parties métalli­ques de la lance par un élément en matériau non dila­table, par exemple un tube en carton, empêchant l'ac­crochage du matériau réfractaire sur les tubes métal­liques et permettant une libre dilatation de ces tubes métalliques sous l'effet de la haute température d'un bain de métal fondu lorsque la lance y est plongée, sans occasionner de fissurations dans la gaine réfrac­taire. La gaine réfractaire peut comprendre, noyée dans sa masse, une armature de renforcement métallique qui s'étend pratiquement coaxialement autour du corps de lance. L'armature de renforcement est de préférence constituée d'une structure à mailles, les dimensions des mailles étant telles que le matériau réfractaire enrobant l'armature s'étende de façon continue à tra­vers les mailles de manière que le réfractaire forme essentiellement une masse monolithique.The refractory sheath is separated from the metal parts of the lance by an element made of non-expandable material, for example a cardboard tube, preventing the attachment of the refractory material on the metal tubes and allowing a free expansion of these metal tubes under the effect. the high temperature of a bath of molten metal when the lance is immersed in it, without causing cracks in the refractory sheath. The refractory sheath may comprise, embedded in its mass, a metal reinforcing reinforcement which extends practically coaxially around the lance body. The reinforcing reinforcement preferably consists of a mesh structure, the dimensions of the meshes being such that the refractory material coating the reinforcement extends continuously through the meshes so that the refractory essentially forms a monolithic mass. .

L'extrémité de la lance est avantageusement protégée par un nez de protection en matériau réfractaire, éventuellement fixé de manière amovible. Diverses for­mes de réalisation de nez de protection sont connues, par exemple par BE 904670, EP 0099348 et EP 0116818. Suivant un aspect de l'invention, le nez comprend un tube de raccord qui s'étend dans l'alignement du tube d'injection, le diamètre intérieur dudit tube étant plus petit que le diamètre intérieur du tube d'injec­ tion. Dans un mode d'exécution particulier, le tube de raccord porte plusieurs tubulures communiquant avec le conduit dudit tube de raccord, ces tubulures étant réparties autour du tube de raccord et s'étendant dans des directions générales transversales à l'axe du tube, ces tubulures débouchant à la surface extérieure du nez afin d'éjecter des jets de fluide latéraux de manière à équilibrer la réaction exercée sur la lance par le fluide éjecté. Le tube de raccord peut avanta­geusement être entouré d'une chambre de refroidisse­ment.The end of the lance is advantageously protected by a protective nose made of refractory material, optionally removably attached. Various embodiments of protective noses are known, for example from BE 904670, EP 0099348 and EP 0116818. According to one aspect of the invention, the nose comprises a connecting tube which extends in alignment with the tube. injection, the inside diameter of said tube being smaller than the inside diameter of the injection tube tion. In a particular embodiment, the connection tube carries several tubes communicating with the conduit of said connection tube, these tubes being distributed around the connection tube and extending in general directions transverse to the axis of the tube, these tubes opening to the outer surface of the nose in order to eject lateral fluid jets so as to balance the reaction exerted on the lance by the ejected fluid. The connecting tube can advantageously be surrounded by a cooling chamber.

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

  • - les figures 1A et 1B représentent une lance exem­plaire conforme à l'invention, une partie de la lance étant montrée en coupe axiale et une partie étant montrée en élévation avec arrachement.
  • - la figure 2 est une coupe transversale suivant la ligne II-II de la figure 1.
  • - la figure 3 est une coupe transversale suivant la ligne III-III de la figure 1.
  • - la figure 4 est une vue semblable à celle de la figure 3 mais montrant une variante d'exécution exemplaire.
  • - la figure 5 illustre une variante d'exécution de la lance de la figure 1, avec un nez de protection exécuté sous forme amovible.
The invention is explained in detail in the following with the aid of the attached drawings. In these drawings:
  • - Figures 1A and 1B show an exemplary lance according to the invention, part of the lance being shown in axial section and a part being shown in elevation with cutaway.
  • - Figure 2 is a cross section along the line II-II of Figure 1.
  • - Figure 3 is a cross section along line III-III of Figure 1.
  • - Figure 4 is a view similar to that of Figure 3 but showing an exemplary alternative embodiment.
  • - Figure 5 illustrates an alternative embodiment of the lance of Figure 1, with a protective nose executed in removable form.

Se reportant aux figures 1A et 1B, on voit en 1 un tube d'injection métallique suspendu par son extrémité supérieure à un anneau de levage 11 auquel il est fixé par un écrou 12. Le tube 1 sert au passage d'un pro­duit (matière ou gaz) à injecter ou insuffler dans un métal liquide. Sur une partie de sa longueur, le tube d'injection 1 est entouré d'un tube métallique coulis­sant 2 dont l'extrémité inférieure est logée dans une rainure formée dans une rondelle 3 qui sert d'appui et est soudé sur le tube d'injection 1. Le tube 2 a ici une forme cylindrique ainsi que le montrent les figu­res 2 et 3, mais il peut également avoir une forme prismatique ainsi qu'il sera décrit plus loin à l'aide de la figure 4.Referring to Figures 1A and 1B, we see in 1 a metal injection tube suspended by its upper end from a lifting ring 11 to which it is fixed by a nut 12. The tube 1 is used for the passage of a product (material or gas) to be injected or injected into a liquid metal. Over a part of its length, the injection tube 1 is surrounded by a sliding metal tube 2, the lower end of which is housed in a groove formed in a washer 3 which serves as a support and is welded to the tube. injection 1. The tube 2 here has a cylindrical shape as shown in FIGS. 2 and 3, but it can also have a prismatic shape as will be described below with the aid of FIG. 4.

L'espace entre les tubes 1 et 2 forme une chambre de refroidissement 20 (figures 2 et 3). A sa partie inférieure le tube 2 est percé d'au moins une ouver­ture à laquelle est connectée un raccord radial 21 qui communique avec le conduit d'un tube 22 descendant le long et à l'extérieur du tube 2. Dans le mode d'exécution exemplaire illustré dans les dessins, quatre tubes 22 descendent ainsi le long du tube 2 et communiquent avec la chambre 20. A leur extrémité supérieure, ces tubes 22 s'ouvrent dans un caisson 23 dans lequel débouche d'autre part une conduite 24 pour l'amenée d'un agent de refroidissement.The space between the tubes 1 and 2 forms a cooling chamber 20 (Figures 2 and 3). At its lower part, the tube 2 is pierced with at least one opening to which is connected a radial connector 21 which communicates with the conduit of a tube 22 descending along and outside the tube 2. In the mode of exemplary execution illustrated in the drawings, four tubes 22 thus descend along the tube 2 and communicate with the chamber 20. At their upper end, these tubes 22 open in a box 23 into which, on the other hand, leads a pipe 24 for the supply of a cooling agent.

Lorsque la lance est plongée dans un bain de métal liquide et lorsque la conduite 24 est alimentée en agent de refroidissement, par exemple un gaz neutre, un flux de fluide de refroidissement parcourt les tubes 22 de haut en bas et est amené par les raccords radiaux 21 dans le bas de la chambre de refroidisse­ment 20, puis il remonte dans celle-ci et, arrivé dans le haut de la chambre 20, le flux de refroidissement continue à se propager entre le tube d'injection et l'entretoise 14 pour venir à être évacué au niveau du ressort 13 par exemple.When the lance is immersed in a bath of liquid metal and when the pipe 24 is supplied with coolant, for example a neutral gas, a flow of coolant flows through the tubes 22 from top to bottom and is brought in by the radial connections. 21 at the bottom of the cooling chamber 20, then it rises in the latter and, arrived at the top of the chamber 20, the cooling flow continues to propagate between the injection tube and the spacer 14 to come to be discharged at the spring 13 for example.

De cette manière, le flux de fluide de refroidissement qui circule dans les tubes 22 est un flux de fluide froid qui sort du caisson distributeur 23 et descend d'abord pratiquement le long de la surface intérieure de la gaine réfractaire 4 en produisant un effet de refroidissement des plus efficaces. Dans la lance refroidie antérieure, quand le fluide de refroidisse­ment remontait le long du tube intermédiaire, il avait déjà pu se réchauffer quelque peu et son effet était donc moins énergique que dans la lance selon la pré­sente invention.In this way, the flow of cooling fluid which circulates in the tubes 22 is a flow of cold fluid which leaves the distributor box 23 and first descends practically along the interior surface of the refractory sheath 4, producing a most efficient cooling. In the anterior cooled lance, when the cooling fluid rose along the intermediate tube, it had already been able to heat up somewhat and its effect was therefore less energetic than in the lance according to the present invention.

Pour renforcer l'effet de refroidissement sur le tube d'injection, un moyen est avantageusement prévu dans la chambre 20 pour y ralentir la circulation du fluide de refroidissement. Dans l'exemple de réalisa­tion illustré dans la figure 1, ce moyen est constitué d'un fil d'acier 25 enroulé en hélice autour du tube d'injection sur une partie de la longueur de celui-ci. Ce fil a pour effet de guider le fluide de refroidis­sement dans la chambre 20 en un mouvement tournant qui se développe de bas en haut, ralentissant ainsi la circulation du flux dans la chambre de refroidissement et améliorant l'effet de refroidissement.To enhance the cooling effect on the injection tube, a means is advantageously provided in the chamber 20 to slow the circulation of the cooling fluid there. In the embodiment illustrated in FIG. 1, this means consists of a steel wire 25 wound helically around the injection tube over part of the length thereof. This wire has the effect of guiding the cooling fluid in the chamber 20 in a rotating movement which develops from bottom to top, thus slowing the circulation of the flow in the cooling chamber and improving the cooling effect.

D'autres moyens peuvent également être prévus pour ralentir le fluide de refroidissement et la figure 4 illustre par exemple un autre mode de réalisation. On observera que la chambre de refroidissement 20 est ici limitée extérieurement par un tube 2 de section trans­versale polygonale carrée. Il va de soi que la section transversale polygonale peut avoir un nombre quelcon­que de côtés. Le moyen de ralentissement du flux de refroidissement, dans cet exemple, est constitué d'éléments de chicane 26 disposés dans des plans transversaux à l'axe longitudinal du tube d'injection 1 et répartis régulièrement le long du tube d'injec­tion. Dans le mode de réalisation illustré, les élé­ments 26 s'étendent sur une moitié de la section transversale de la chambre de refroidissement 20, les éléments successifs occupant des positions alternées de manière à ménager pour le fluide de refroidissement un passage sinueux suivant la direction axiale du tube d'injection. Les éléments de chicanes pourraient aussi, par exemple, s'étendre tous sur la totalité de la section transversale de la chambre de refroidisse­ment et être percés d'orifices qui, de préférence, ne seraient pas tous dans le même alignement suivant la direction axiale. Ces éléments de chicanes forment des rétrécissements de la section de passage qui obligent le fluide de refroidissement à ralentir dans la cham­bre de refroidissement.Other means can also be provided to slow down the cooling fluid and FIG. 4 illustrates for example another embodiment. It will be observed that the cooling chamber 20 is here limited externally by a tube 2 of square polygonal cross section. It goes without saying that the section polygonal cross-section can have any number of sides. The means for slowing down the cooling flow, in this example, consists of baffle elements 26 arranged in planes transverse to the longitudinal axis of the injection tube 1 and distributed regularly along the injection tube. In the illustrated embodiment, the elements 26 extend over one half of the cross section of the cooling chamber 20, the successive elements occupying alternating positions so as to provide for the cooling fluid a sinuous passage in the axial direction. of the injection tube. The baffle elements could also, for example, all extend over the entire cross section of the cooling chamber and be pierced with orifices which, preferably, are not all in the same alignment in the axial direction. These baffle elements form narrowing of the passage section which forces the cooling fluid to slow down in the cooling chamber.

Le dispositif de refroidissement a également pour avantage que lorsque la lance est utilisée pour l'injection de certains produits pulvérulents dans un bain de métal liquide, il empêche ces produits d'atteindre une température telle qu'ils se transfor­meraient en une matière pâteuse qui provoquerait géné­ralement un bouchage des conduits de la lance.The cooling device also has the advantage that when the lance is used for injecting certain pulverulent products into a bath of liquid metal, it prevents these products from reaching a temperature such that they would turn into a pasty material which would cause generally a blockage of the lance ducts.

Les tubes métalliques de la lance sont protégés par une gaine 4 en matériau réfractaire avec interposition d'un élément 5 en matériau non dilatable sous l'effet de la chaleur. La gaine 4 est maintenue par la pres­sion d'un ressort hélicoîdal 13 agissant par l'inter­ médiaire d'une entretoise 14. La gaine réfractaire est représentée dans la figure 1 sous forme monolithique, mais elle pourrait également, conformément à une technique connue, être formée de viroles réfractaires superposées et unies entre elles par des joints. Dans un tel mode d'exécution, les joints constituent évi­demment des points faibles où se produisent également des détériorations. L'élément intercalaire 5 est par exemple constitué d'un tube en carton mais d'autres matières non dilatables peuvent être utilisées. La présence de cet élément non dilatable a pour effet de désolidariser la gaine réfractaire de l'élément métal­lique de la lance et de la soustraire à l'influence des dilatations du corps métallique tout en lui per­mettant une libre dilatation sous l'effet de la haute température communiquée par le bain de métal fondu lorsque la lance y est plongée. Grace à cette désoli­darisation résultant de la présence de l'élément intercalaire non dilatable, la gaine réfractaire se dégrade beaucoup moins profondément et bien moins rapidement que dans une lance selon la technique anté­rieure. Il en résulte une diminution appréciable des réparations et remplacements, ce qui se traduit par des économies considérables en main-d'oeuvre, temps d'immobilisation de la lance et consommations de lan­ces.The metal tubes of the lance are protected by a sheath 4 made of refractory material with the interposition of an element 5 made of non-expandable material under the effect of heat. The sheath 4 is maintained by the pressure of a helical spring 13 acting through the inter median of a spacer 14. The refractory sheath is shown in FIG. 1 in monolithic form, but it could also, in accordance with a known technique, be formed of refractory rings superimposed and joined together by seals. In such an embodiment, the joints obviously constitute weak points where deterioration also occurs. The intermediate element 5 is for example made of a cardboard tube but other non-expandable materials can be used. The presence of this non-expandable element has the effect of dissociating the refractory sheath from the metallic element of the lance and shielding it from the influence of expansions of the metallic body while allowing it to expand freely under the effect of the high temperature communicated by the molten metal bath when the lance is immersed in it. Thanks to this separation resulting from the presence of the non-expandable intermediate element, the refractory sheath degrades much less deeply and much less quickly than in a lance according to the prior art. This results in a significant reduction in repairs and replacements, which translates into considerable savings in manpower, immobilization time of the lance and consumption of lances.

Pour parfaire la résistance mécanique du matériau ré­fractaire de la gaine de protection 4, une armature de renforcement 15 peut avantageusement être noyée dans la masse réfractaire. Les brevets BE-837384, BE-849582 et DE-2659735, par exemple, décrivent une armature de renforcement constituée d'une structure à mailles réa­lisée à partir de fil en acier galvanisé. Les dimen­sions des mailles de l'armature 15 sont telles que le matériau réfractaire qui enrobe l'armature s'étende de façon continue à travers les mailles et de part et d'autre de l'armature 15.To improve the mechanical resistance of the refractory material of the protective sheath 4, a reinforcing reinforcement 15 can advantageously be embedded in the refractory mass. The patents BE-837384, BE-849582 and DE-2659735, for example, describe a reinforcing reinforcement consisting of a mesh structure produced from galvanized steel wire. The dimensions of the mesh of the frame 15 are such that the refractory material which coats the reinforcement extends continuously through the meshes and on either side of the reinforcement 15.

Dans la figure 1 la gaine réfractaire 4 forme égale­ment un nez de protection 6 pour assurer un équilibra­ge de la réaction exercée sur la lance par le fluide lors de son éjection. Dans ce mode d'exécution exem­plaire, le tube d'injection 1 se prolonge par un tube de raccord métallique 7 soudé à son extrémité. L'ex­trémité inférieure 8 du tube 7 est fermée et le tube 7 porte plusieurs tubulures 9 qui communiquent avec le conduit du tube 7 et sont disposés de manière à débou­cher dans la paroi latérale extérieure du nez. Le tube de raccord 7 porte par exemple quatre tubulures 9, mais leur nombre peut être quelconque. Ces tubulures servent à produire plusieurs jets latéraux de fluide avec une répartition la plus équilibrée possible au­tour de l'axe longitudinal du tube 7, c'est-à-dire l'axe longitudinal de la lance. Cette disposition latérale et équilibrée des tubulures de sortie est connue par les brevets BE 871590 et BE 904670 par exemple.In FIG. 1, the refractory sheath 4 also forms a protective nose 6 to ensure balancing of the reaction exerted on the lance by the fluid during its ejection. In this exemplary embodiment, the injection tube 1 is extended by a metal connection tube 7 welded at its end. The lower end 8 of the tube 7 is closed and the tube 7 carries several tubes 9 which communicate with the conduit of the tube 7 and are arranged so as to open into the external lateral wall of the nose. The connection tube 7 carries for example four pipes 9, but their number can be any. These pipes are used to produce several lateral jets of fluid with the most balanced distribution possible around the longitudinal axis of the tube 7, that is to say the longitudinal axis of the lance. This lateral and balanced arrangement of the outlet pipes is known from patents BE 871590 and BE 904670 for example.

Suivant un aspect de l'invention, cependant, le tube de raccord 7 a un diamètre plus petit que celui du tube d'injection 1 de manière à créer une zone à plus haute pression qui peut servir de tampon et permet d'éviter l'obstruction des tubulures 9 par rentrée de métal liquide lors des baisses de pression du fluide dans le tube d'injection. De telles obstructions des tubulures n'étaient pas rares dans les nez de lance antérieurs, ce qui entravait le bon déroulement du processus technique. Cet inconvénient est éliminé grâce à l'invention présente.According to one aspect of the invention, however, the connecting tube 7 has a smaller diameter than that of the injection tube 1 so as to create a higher pressure zone which can act as a buffer and makes it possible to avoid the obstruction of the pipes 9 by re-entry of liquid metal when the fluid pressure drops in the injection tube. Such tubing obstructions were not uncommon in the anterior lance noses, which hampered the smooth running of the technical process. This drawback is eliminated thanks to the present invention.

Dans le mode d'exécution exemplaire illustré dans la figure 1, les tubulures 9 sont rectilignes et obliques par rapport à l'axe de la lance. Il est bien entendu cependant que des variantes d'exécution peuvent être utilisées comme décrit notamment dans les brevets BE 871590 et BE 904670 précités. En particulier, les tu­bulures peuvent être courbes ou être agencées pour produire des jets horizontaux.In the exemplary embodiment illustrated in Figure 1, the tubes 9 are straight and oblique with respect to the axis of the lance. It is understood, however, that variant embodiments can be used as described in particular in the aforementioned patents BE 871590 and BE 904670. In particular, the tubes can be curved or be arranged to produce horizontal jets.

Dans la masse réfractaire du nez 6 est avantageusement noyée une armature de renforcement 16 comme décrit par exemple dans les brevets EP 0099348 et US 4492365. Cette armature de renforcement peut être constituée de façon semblable à l'armature 15 de la gaine de lance 2 et elle peut prolonger cette armature en s'étendant coaxialement autour du tube de raccord 7, puis s'éten­dre dans un plan transversal à l'axe dudit tube à une certaine distance de l'extrémité de ce tube. Les bran­ches identifiées par la notation de référence 17 sont des éléments d'ancrage soudés sur le tube de raccord.In the refractory mass of the nose 6 is advantageously embedded a reinforcing reinforcement 16 as described for example in patents EP 0099348 and US 4492365. This reinforcing reinforcement can be constituted in a similar manner to the reinforcement 15 of the lance sheath 2 and it can extend this frame by extending coaxially around the connecting tube 7, then extending in a plane transverse to the axis of said tube at a certain distance from the end of this tube. The branches identified by the reference notation 17 are anchoring elements welded to the connecting tube.

Il va de soi que le nez de lance décrit ci-dessus et illustré dans les dessins ci-annexés n'est qu'un mode d'exécution exemplaire et que d'autres modes d'exécu­tion peuvent être prévus avec la lance selon l'inven­tion. Divers types de nez de lance sont connus et, pour illustrer l'état de la technique, on citera par exemple les brevets EP 0099348 et EP 0116818.It goes without saying that the lance nose described above and illustrated in the attached drawings is only an exemplary embodiment and that other embodiments can be provided with the lance according to the invention. Various types of lance noses are known and, to illustrate the state of the art, mention may be made, for example, of patents EP 0099348 and EP 0116818.

En particulier, le nez de protection, tout comme le corps de la lance, peut comprendre un moyen de refroi­dissement : par exemple une chambre entourant le tube de raccord 7.In particular, the protective nose, like the body of the lance, can comprise a cooling means: for example a chamber surrounding the connection tube 7.

L'extrémité de la lance peut être protégée par un nez vissé sur le tube d'injection de manière à pouvoir être remplacé sans avoir à remplacer toute la lance. Divers types de nez de lance amovibles sont connus. Le nez de lance illustré à titre d'exemple à la figure 5 est semblable à celui qui se trouve montré dans la figure 1. L'extrémité supérieure du tube de raccord 7 sort du bloc réfractaire du nez et présente un filet 18 destiné à coopérer avec un filet semblable aménagé dans la paroi intérieure du tube d'injection 1. Ce mode d'exécution allie les avantages du nez montré dans la figure 1 avec ceux du nez de lance amovible. Comme dit plus haut, un moyen de refroidissement peut également être prévu dans le nez de protection amovi­ble.The end of the lance can be protected by a nose screwed onto the injection tube so that it can be replaced without having to replace the entire lance. Various types of removable lance noses are known. The lance nose illustrated by way of example in FIG. 5 is similar to that which is shown in FIG. 1. The upper end of the connection tube 7 comes out of the refractory block of the nose and has a thread 18 intended to cooperate with a similar thread arranged in the interior wall of the injection tube 1. This embodiment combines the advantages of the nose shown in FIG. 1 with those of the removable lance nose. As said above, a cooling means can also be provided in the removable protective nose.

Le mode de réalisation décrit dans ce qui précède et illustré dans les dessins ci-annexés n'est bien enten­du qu'un exemple d'exécution nullement limitatif et il est clair pour l'homme de l'art que diverses variantes d'exécution peuvent être adoptées sans sortir de la portée des revendications ci-jointes.The embodiment described in the above and illustrated in the accompanying drawings is of course only an example of execution in no way limiting and it is clear to those skilled in the art that various variants of execution can be adopted without departing from the scope of the appended claims.

Claims (21)

1. Lance de soufflage ou d'injection comprenant un tube d'injection (1), un tube intermédiaire (2) coaxial au tube d'injection (1) et une gaine de pro­tection (4) en matériau réfractaire s'étendant sur au moins une partie de la longueur du tube d'injection (1), le tube d'injection (1) et le tube intermédiaire (2) délimitant entre eux une chambre (20), caractéri­sée par au moins un tube d'amenée de fluide de refroi­dissement (22) s'étendant le long et à l'extérieur du tube intermédiaire (2), ce tube d'amenée (22) étant connecté à son extrémité supérieure à un dispositif d'alimentation de fluide de refroidissement (23) et communiquant à son extrémité inférieure (21) avec la partie inférieure de la chambre (20) de manière à fai­re circuler un flux de fluide de refroidissement de haut en bas à l'extérieur dudit tube intermédiaire (2) et de bas un haut dans la chambre de refroidissement (20).1. Blowing or injection lance comprising an injection tube (1), an intermediate tube (2) coaxial with the injection tube (1) and a protective sheath (4) made of refractory material extending over the at least part of the length of the injection tube (1), the injection tube (1) and the intermediate tube (2) delimiting between them a chamber (20), characterized by at least one fluid supply tube cooling tube (22) extending along and outside the intermediate tube (2), this supply tube (22) being connected at its upper end to a coolant supply device (23) and communicating at its lower end (21) with the lower part of the chamber (20) so as to circulate a flow of cooling fluid from top to bottom outside of said intermediate tube (2) and from bottom to top in the cooling chamber (20). 2. Lance selon la revendication 1, caractérisée en ce que la chambre de refroidissement (20) contient un moyen (par exemple 25, 26) pour ralentir la circula­tion du fluide de refroidissement.2. Lance according to claim 1, characterized in that the cooling chamber (20) contains means (for example 25, 26) for slowing the circulation of the cooling fluid. 3. Lance selon la revendication 2, caractérisée en ce que ledit moyen pour ralentir la circulation du fluide de refroidissement consiste en un fil (25) enroulé hé­licoîdalement autour du tube d'injection (1).3. Lance according to claim 2, characterized in that said means for slowing down the circulation of the coolant consists of a wire (25) wound helically around the injection tube (1). 4. Lance selon la revendication 2, caractérisée en ce que ledit moyen pour ralentir la circulation du fluide de refroidissement consiste en éléments de chicane (26) disposés à intervalles le long du tube d'injec­tion (1).4. Lance according to claim 2, characterized in that said means for slowing down the circulation of the cooling fluid consists of baffle elements (26) arranged at intervals along the injection tube (1). 5. Lance selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la gaine en matière réfrac­taire (4) entoure l'ensemble des tubes métalliques (1, 2, 22) avec interposition d'un élément (5) en matière non dilatable sous l'effet de la chaleur.5. Lance according to any one of claims 1 to 4, characterized in that the sheath of refractory material (4) surrounds all of the metal tubes (1, 2, 22) with the interposition of an element (5) in non-expandable material under the effect of heat. 6. Lance selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la gaine réfractaire (4) comprend, noyée dans sa masse, une armature de renfor­cement métallique (15) qui s'étend pratiquement coaxialement autour du tube d'injection (1), l'armatu­re de renforcement (15) étant constituée d'une struc­ture à mailles, les dimensions des mailles étant telles que le matériau réfractaire enrobant l'armature s'étende de façon continue à travers les mailles de manière que le matériau réfractaire forme essentielle­ment une masse monolithique.6. Lance according to any one of claims 1 to 5, characterized in that the refractory sheath (4) comprises, embedded in its mass, a metal reinforcing frame (15) which extends substantially coaxially around the tube injection (1), the reinforcing reinforcement (15) being constituted by a mesh structure, the dimensions of the meshes being such that the refractory material coating the reinforcement extends continuously through the meshes so that the refractory material essentially forms a monolithic mass. 7. Lance selon l'une quelconque des revendications précédentes, caractérisée en ce que son extrémité est protégée par un nez en matériau réfractaire (6) com­prenant un tube (7) s'étendant dans l'alignement du tube d'injection (1), le diamètre intérieur dudit tube (7) étant plus petit que le diamètre intérieur du tube d'injection (1).7. Lance according to any one of the preceding claims, characterized in that its end is protected by a nose made of refractory material (6) comprising a tube (7) extending in alignment with the injection tube (1) , the inside diameter of said tube (7) being smaller than the inside diameter of the injection tube (1). 8. Lance selon la revendication 7, caractérisée en ce que le tube de raccord (7) porte plusieurs tubulures (9) communiquant avec le conduit dudit tube de raccord (7), ces tubulures (9) étant réparties autour du tube de raccord (7) et s'étendant dans des directions géné­rales transversales à l'axe du tube (7), et débouchant à la surface extérieure du nez de manière à éjecter des jets de fluide latéraux.8. Lance according to claim 7, characterized in that the connection tube (7) carries several tubes (9) communicating with the conduit of said connection tube (7), these tubes (9) being distributed around the connection tube ( 7) and extending in general directions transverse to the axis of the tube (7), and opening onto the external surface of the nose so as to eject lateral fluid jets. 9. Lance selon la revendication 8, caractérisée en ce que les tubulures (9) sont rectilignes.9. Lance according to claim 8, characterized in that the tubes (9) are rectilinear. 10. Lance selon la revendication 8, caractérisée en ce que les tubulures (9) sont courbes.10. Lance according to claim 8, characterized in that the tubes (9) are curved. 11. Lance selon la revendication 8, 9 ou 10, caracté­risée en ce que les tubulures (9) débouchent dans la surface extérieure du nez de manière à produire des jets latéraux de fluide dans des directions obliques par rapport à l'axe de la lance.11. Lance according to claim 8, 9 or 10, characterized in that the tubes (9) open into the outer surface of the nose so as to produce lateral jets of fluid in oblique directions relative to the axis of the lance . 12. Lance selon la revendication 7 ou 8, caractérisée en ce que le nez (6) comprend une armature de renfor­cement (16) noyée dans la masse réfractaire.12. Lance according to claim 7 or 8, characterized in that the nose (6) comprises a reinforcing reinforcement (16) embedded in the refractory mass. 13. Lance selon l'une quelconque des revendications 7, à 12, caractérisée en ce que l'extrémité supérieure du tube (7) du nez (6) présente un moyen de fixation (18) pour fixer le nez (6) à l'extrémité de la lance de façon amovible.13. Lance according to any one of claims 7 to 12, characterized in that the upper end of the tube (7) of the nose (6) has a fixing means (18) for fixing the nose (6) to the end of the lance removably. 14. Lance selon l'une quelconque des revendications 7 à 13, caractérisée en ce que ledit tube (7) est entou­ré d'une chambre de refroidissement.14. Lance according to any one of claims 7 to 13, characterized in that said tube (7) is surrounded by a cooling chamber. 15. Nez de protection en matériau réfractaire pour lance de soufflage ou d'injection, caractérisé en ce qu'il comprend un tube (7) s'étendant dans l'aligne­ment du tube d'injection (1), le diamètre intérieur dudit tube (7) étant plus petit que le diamètre inté­rieur du tube d'injection (1), l'extrémité supérieure dudit tube (7) présentant un moyen de fixation (18) pour fixer le nez (6) à l'extrémité d'une lance de soufflage ou d'injection de manière amovible.15. Protective nose made of refractory material for blowing or injection lance, characterized in that it comprises a tube (7) extending in alignment with the injection tube (1), the inside diameter of said tube (7) being smaller than the inside diameter of the injection tube (1), the upper end of said tube (7) having a fixing means (18) for fixing the nose (6) to the end of a blowing or injection lance removably. 16. Nez de lance selon la revendication 15, caractéri­sé en ce que ledit tube (7) du nez (6) porte plusieurs tubulures (9) communiquant avec le conduit de ce tube (7), ces tubulures (9) étant réparties autour du tube de raccord (7) et s'étendant dans des directions géné­rales transversales à l'axe du tube (7), ces tubulures débouchant à la surface extérieure du nez de manière à éjecter des jets de fluide latéraux.16. Lance nose according to claim 15, characterized in that said tube (7) of the nose (6) carries several tubes (9) communicating with the conduit of this tube (7), these tubes (9) being distributed around the connecting tube (7) and extending in general directions transverse to the axis of the tube (7), these tubes opening out to the external surface of the nose so as to eject lateral jets of fluid. 17. Nez de lance selon la revendication 16, caractéri­sé en ce que les tubulures (9) sont rectilignes.17. Lance nose according to claim 16, characterized in that the tubes (9) are rectilinear. 18. Nez de lance selon la revendication 16, caractéri­sé en ce que les tubulures (9) sont courbes.18. Lance nose according to claim 16, characterized in that the tubes (9) are curved. 19. Nez de lance selon la revendication 16, 17 ou 18, caractérisé en ce que les tubulures (9) débouchent dans la surface extérieure du nez de manière à produi­re des jets latéraux de fluide dans des directions obliques par rapport à l'axe de la lance.19. lance nose according to claim 16, 17 or 18, characterized in that the tubes (9) open into the outer surface of the nose so as to produce lateral jets of fluid in oblique directions relative to the axis of spear. 20. Nez de lance selon la revendication 15 ou 16, ca­ractérisé en ce qu'il comprend une armature de renfor­cement (16) noyée dans la masse réfractaire.20. Lance nose according to claim 15 or 16, characterized in that it comprises a reinforcing reinforcement (16) embedded in the refractory mass. 21. Nez de lance selon l'une quelconque des revendica­tions 15 à 20, caractérisé en ce que ledit tube (7) est entouré d'une chambre de refroidissement.21. lance nose according to any one of claims 15 to 20, characterized in that said tube (7) is surrounded by a cooling chamber.
EP88870073A 1988-04-28 1988-04-28 Lance for injection or blowing-up with a cooling chamber Withdrawn EP0339174A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP88870073A EP0339174A1 (en) 1988-04-28 1988-04-28 Lance for injection or blowing-up with a cooling chamber
CN 89102848 CN1037361A (en) 1988-04-28 1989-04-27 Spray or air-jet lance with cooling chamber
BR8901996A BR8901996A (en) 1988-04-28 1989-04-27 INJECTION OR INSUFLATION BOAT AND PROTECTION TIP IN REFRACTORY MATERIAL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88870073A EP0339174A1 (en) 1988-04-28 1988-04-28 Lance for injection or blowing-up with a cooling chamber

Publications (1)

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EP0339174A1 true EP0339174A1 (en) 1989-11-02

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EP88870073A Withdrawn EP0339174A1 (en) 1988-04-28 1988-04-28 Lance for injection or blowing-up with a cooling chamber

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EP (1) EP0339174A1 (en)
CN (1) CN1037361A (en)
BR (1) BR8901996A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919634A1 (en) * 1997-12-01 1999-06-02 Plibrico G.m.b.H. Blow lance with gas cooled refractory casing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113048486A (en) * 2021-03-23 2021-06-29 中国恩菲工程技术有限公司 Industrial waste comprehensive treatment furnace
CN112831626A (en) * 2021-03-30 2021-05-25 马鞍山钢铁股份有限公司 Molten iron pretreatment feeding system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1125234A (en) * 1954-05-28 1956-10-26 Huettenwerk Oberhausen Ag Blow nozzle for metal refining
LU76524A1 (en) * 1976-01-07 1977-06-20 Rene Desaar
LU76254A1 (en) * 1976-11-24 1978-07-10
BE902065A (en) * 1985-03-29 1985-07-16 Vasipari Kutato Fejleszto Blowing lance for treating metal melt baths - includes metal tube comprising several layers with channels for cooling agent
DE3423192A1 (en) * 1984-06-22 1986-01-02 Krupp Polysius Ag, 4720 Beckum Submerged lance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1125234A (en) * 1954-05-28 1956-10-26 Huettenwerk Oberhausen Ag Blow nozzle for metal refining
LU76524A1 (en) * 1976-01-07 1977-06-20 Rene Desaar
LU76254A1 (en) * 1976-11-24 1978-07-10
DE3423192A1 (en) * 1984-06-22 1986-01-02 Krupp Polysius Ag, 4720 Beckum Submerged lance
BE902065A (en) * 1985-03-29 1985-07-16 Vasipari Kutato Fejleszto Blowing lance for treating metal melt baths - includes metal tube comprising several layers with channels for cooling agent

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919634A1 (en) * 1997-12-01 1999-06-02 Plibrico G.m.b.H. Blow lance with gas cooled refractory casing

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CN1037361A (en) 1989-11-22
BR8901996A (en) 1989-12-05

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