EP0103515B1 - Nozzle for hot guniting - Google Patents

Nozzle for hot guniting Download PDF

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Publication number
EP0103515B1
EP0103515B1 EP83401750A EP83401750A EP0103515B1 EP 0103515 B1 EP0103515 B1 EP 0103515B1 EP 83401750 A EP83401750 A EP 83401750A EP 83401750 A EP83401750 A EP 83401750A EP 0103515 B1 EP0103515 B1 EP 0103515B1
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EP
European Patent Office
Prior art keywords
nozzle
tubes
carrier gas
level
refractory powder
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.)
Expired
Application number
EP83401750A
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German (de)
French (fr)
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EP0103515A1 (en
Inventor
Claude Guenard
Hugues Zanetta
Jean-Claude Grosjean
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Institut de Recherches de la Siderurgie Francaise IRSID
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Institut de Recherches de la Siderurgie Francaise IRSID
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Priority to AT83401750T priority Critical patent/ATE26884T1/en
Publication of EP0103515A1 publication Critical patent/EP0103515A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
    • B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
    • B05B7/205—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
    • F27D1/1647—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen
    • F27D1/1652—Flame guniting; Use of a fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
    • F27D1/1647—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen
    • F27D1/1652—Flame guniting; Use of a fuel
    • F27D2001/1663—Fluid fuel, e.g. gas

Definitions

  • the invention relates to a gunning lance tip for projecting a refractory powder through a flame, the lance being connected to a supply of oxidizing gas, combustible gas and refractory powder, one of the gases being the carrier gas. the powder in the nozzle.
  • a gunning lance of this type is known in particular from the document FR 2 419 484. More generally, the guniting techniques have been the subject of numerous studies and patents: reference may be made, for example, to the documents FR 2 168 916 and FR 2 066 355.
  • GB-A-933839 describes a head of this type constituted by a metal block drilled longitudinally several times so as to make a plurality of longitudinal passages therein. Half of them are reserved for the powder, the other half for the combustible gas stream, the passages reserved for the powder more precisely serving as accommodation for attached tubes, which channel the powder to them.
  • the object of the invention is to propose a gunning lance which, while retaining the greatest technical simplicity, nevertheless allows the powder to reach high temperatures, without however having the drawbacks of the solutions mentioned above.
  • the internal cylinder being provided with a front closure at the nose of the nozzle, while it has orifices making the interstitial passage space communicate with its hollow interior volume, this volume being itself even intended to be connected to the non-carrier gas supply.
  • the powder particles are also found to be more homogeneous in pressure and velocities. As a long flame is obtained, the contact time of the particles and the flame is sufficient to ensure a high temperature of the powder.
  • the rejected product is homogeneous and of low porosity. The yield is high.
  • the invention allows the use of a fully pneumatic distribution system, better suited than mechanical distributor systems.
  • the tubes of the same ring are arranged contiguously, at least at the nose of the nozzle.
  • the tube crowns are arranged substantially contiguous with one another and with respect to the cylindrical walls, at least at the level of the nose of the end piece, the ratio of the outlet surfaces thus obtained for the various conduits (tubes on the one hand, interstices on the other hand) allowing a good combination of flow rates and pressures.
  • the endpiece is adaptable to the end of a gunning lance of the type comprising a central duct connected to the supply of non-carrier gas and surrounded by an annular duct connected to the carrier gas supply and refractory powder.
  • the end piece comprises at least thirty tubes.
  • the nozzle 1 subject to the gunning lance 2, comprises a barrel 3 tube holder maintained on the front end of the lance 2 by means of a stainless steel retaining ring 4 brazed at 5 and 6 to the barrel 3 and the cylindrical outline of the lance 2.
  • the stainless steel barrel 3 comprises a central bore 7 of relatively large diameter and two bore crowns 8a and 8b into which 35 copper tubes are inserted distributed over two crowns of tubes 9a and 9b of 150 m long and 3 , 8 mm inside diameter fixed at one of their ends by solder 10.
  • the tubes 9a and 9b form at their other end the nose 11 of the end piece 1: they are contiguous to each other at this level, and are sandwiched between the ends of two substantially cylindrical walls, internal 12 and external 13 respectively.
  • the external wall 13 of copper surrounds the crown of tubes 9b and is brazed on the barrel 3. Although it can be described as substantially cylindrical, it has, in the embodiment shown, in fact a low taper of the order of 3% adapted to the convergence of the tubes 9. The wall 13 can project slightly beyond the nose 11 of the nozzle 1.
  • the internal wall 12 has the shape of a generally hollow cylinder, leveling the nose 11 of the end piece 1, closed on this side by a front wall 14 providing a cavity receiving an insulating refractory 15.
  • the cylindrical wall 12 passes through the central bore 7 of the barrel in which it is centered by centering ribs 16. It has a shoulder 17 in the vicinity of the nose of the lance 2.
  • the lance 2 comprises a central duct 18 connected to a supply of gas which does not carry refractory powder, for example the oxidizer (here oxygen).
  • the central conduit 18 is separated by an annular wall 19 of an annular conduit 20 connected to a supply of refractory powder and carrier gas, for example Is combustible gas.
  • the shoulder 17 has a conical contour 21 which forms an annular passage with an equally conical contour 22 of the barrel 3 leading the refractory powder conveyed by its carrier gas from the outlet of the annulus 20 to the inlets of the tubes 9.
  • a joint in copper 23 ensures the seal between said annular passage and the interstitial space between the tubes 9 and the walls 12 and 13.
  • the cylindrical wall 12 extends towards the inside of the duct 18 of the lance 2 and comes to bear on a surface 25 of an adapter tube 26 to which it is brazed at 27.
  • Eight orifices 28 pass the oxygen arriving through the central duct 18, into the interstitial passage space 24 from which it opens at the level of the nose 11 of the nozzle.
  • a thin brass ring 29 (for example 1/2 mm of splicer) can be interposed between the two tube crowns 9a and 9b, over a short length (15 mm for example).
  • the operation of the device is clear: by injecting into the lance on the one hand gaseous oxygen and on the other hand the refractory powder carried by the combustible gas, the powder and the flame are fractionated, which allows maximum heating of the powder without involving the temperature of the wall.
  • the tip of the invention is therefore particularly well suited to the projection of products with high refractoriness whose use is necessary in steel works.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Finger-Pressure Massage (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

This guniting nozzle end piece for projecting a refractory powder through a flame, the nozzle being connected to a combustive gas, fuel gas and refractory powder feed, one of the gases being the gas carrying the powder in the end-piece, is characterized in that, generally cylindrical in shape, it comprises a plurality of individual tubes (9) disposed in at least one ring (9a,9b) of tubes coaxial with the end-piece (1), opening on the one side at the level of the nose (11) of the end-piece and connected on the other side to the refractory powder and carrier gas feed (20), the plurality of tubes (9) being disposed between two coaxial substantially cylindrical walls respectively internal (12) and external (13), the gaps (24) between the tubes and between the tubes and the cylindrical walls forming a passage space opening on the one side at the level of the nose (11) of the end-piece and further connected to the non carrier gas feed (18).

Description

L'invention concerne un embout de lance de gunitage pour projeter une poudre réfractaire au travers d'une flamme la lance étant reliée à une alimentation en gaz comburant, en gaz combustible et en poudre réfractaire, l'un des gaz étant le gaz porteur de la poudre dans l'embout.The invention relates to a gunning lance tip for projecting a refractory powder through a flame, the lance being connected to a supply of oxidizing gas, combustible gas and refractory powder, one of the gases being the carrier gas. the powder in the nozzle.

Une lance de gunitage de ce type est connue notamment par le document FR 2 419 484. Plus généralement les techniques de gunitage ont fait l'objet de nombreux études et brevets: on pourra se reporter par exemple aux documents FR 2 168 916 et FR 2 066 355.A gunning lance of this type is known in particular from the document FR 2 419 484. More generally, the guniting techniques have been the subject of numerous studies and patents: reference may be made, for example, to the documents FR 2 168 916 and FR 2 066 355.

On sait que l'un des problèmes majeurs liés à ces techniques est celui d'obtenir une élévation maximale de la tempéreture de la poudre réfractaire avant que cette dernière atteigne la paroi à réparer, afin d'obtenir une couche de produit dense et homogène. Faute d'obtenir une température suffisamment élevée, on est obligé de se limiter à l'utilisation de produits peu réfractaires qui ne conviennent pas à toutes les applications.It is known that one of the major problems associated with these techniques is that of obtaining a maximum rise in the temperature of the refractory powder before the latter reaches the wall to be repaired, in order to obtain a layer of dense and homogeneous product. If a sufficiently high temperature is not obtained, it is necessary to limit oneself to the use of products which are not very refractory and which are not suitable for all applications.

Le préchauffage de la surface à réparer n'apporte pas une solution efficace au problème.Preheating the surface to be repaired does not provide an effective solution to the problem.

L'incorporation à la poudre réfractaire d'un élément combustible tel que le carbone s'est avérée peu favorable en raison de l'augmentation de la porosité du produit projeté due à la combustion incomplète du carbone. Le mélange à la poudre d'un métal brûlant dans l'oxygène avec dégagement de chaleur conduit à une technique coûteuse (par exemple dans ce cas du magnésium) quelquefois incompatible (par exemple, l'aluminium incompatible avec MgO) voire indésirable (par exemple dans le cas du fer qui abaisse la réfractarité) enfin dangereuse (en raison des risques de combustion du métal dans l'oxygène de transport).The incorporation into the refractory powder of a combustible element such as carbon has proved to be unfavorable due to the increase in the porosity of the sprayed product due to the incomplete combustion of the carbon. The mixing with the powder of a metal burning in oxygen with release of heat leads to an expensive technique (for example in this case of magnesium) sometimes incompatible (for example, aluminum incompatible with MgO) or even undesirable (for example in the case of iron which lowers the refractoriness) finally dangerous (due to the risks of combustion of the metal in the transport oxygen).

La lance décrite dans le document FR 2419 784 dans laquelle l'oxygène d'un conduit central se mélange, à la sortie de la lance avec du gaz naturel véhiculant la poudre réfractaire à travers un conduit annulaire présente l'avantage de la simplicité. Cependant, la rendement de la lance reste peu élevé (brûleur de forts puissance pour une température de poudre faible).The lance described in document FR 2419 784 in which the oxygen of a central duct mixes, at the outlet of the lance with natural gas conveying the refractory powder through an annular duct has the advantage of simplicity. However, the output of the lance remains low (high power burner for a low powder temperature).

Dans d'autres secteurs techniques tels celui du soudage ou de la métallisation par rechargement à chaud, on peut trouver des documents décrivant des têtes de brûleurs conçues dans le but de favoriser une division conjointe du courant de poudre et du courant de gaz combustible, par exemple, le GB-A-933839 décrit une tête de ce type constituée par un bloc métallique foré longitudinalement à plusieurs reprises de manière à y réaliser une pluralité de passages longitudinaux. La moitié d'entre eux est réservée à la poudre, l'autre moitié au courant gazeux combustible, les passages réservés à la poudre servant plus exactement de logement à des tubes rapportés, qui eux canalisent la poudre.In other technical sectors such as welding or metallization by hot reloading, one can find documents describing burner heads designed with the aim of promoting a joint division of the powder stream and the combustible gas stream, by example, GB-A-933839 describes a head of this type constituted by a metal block drilled longitudinally several times so as to make a plurality of longitudinal passages therein. Half of them are reserved for the powder, the other half for the combustible gas stream, the passages reserved for the powder more precisely serving as accommodation for attached tubes, which channel the powder to them.

Une telle réalisation est relativement complexe. Ces forages sont des opérations coûteuses en main d'oeuvre, mais également par la matière première qui est enlevée. En outre, les espacements entre passages, imposés par la nécessité de conserver suffisamment de matière entre eux, ne sont pas favorables à l'intimité du mélange gaz-poudre recherchée à l'extrémité de sortie du brûleur pour atteindre les niveaux voulus de température de la poudre.Such an achievement is relatively complex. These boreholes are labor-intensive operations, but also by the raw material which is removed. In addition, the spacings between passages, imposed by the need to keep enough material between them, are not favorable for the intimacy of the gas-powder mixture sought at the outlet end of the burner to reach the desired temperature levels of the powder.

L'invention a pour but de proposer une lance de gunitage qui, tout en conservant la plus grande simplicité au niveau technique, permette cependant à la poudre d'atteindre des températures élevées, sans présenter toutefois les inconvénients des solutions ci-dessus mentionnées.The object of the invention is to propose a gunning lance which, while retaining the greatest technical simplicity, nevertheless allows the powder to reach high temperatures, without however having the drawbacks of the solutions mentioned above.

Ce but est atteint selon l'invention par un embout adaptable à l'extrémité d'une lance de gunitage pour projeter une poudre réfractaire au travers d'une flamme, la lance étant reliée à une alimentation en gaz comburant, en gaz combustible et en poudre réfractaire, l'un des gaz étant le gaz porteur de la poudre dans l'embout, cet embout, de forme généralement cylindrique, comportant une pluralité de tubes individuels disposés en au moins une couronne de tubes coaxiale à l'embout, débouchant d'un côté au niveau du nez de l'embout, et destinés à être reliés de l'autre côté à l'alimentation en poudre réfractaire et gaz porteur, ladite pluralité de tubes étant disposée entre deux parois sensiblement cylindriques de deux cylindres coaxiaux respectivement interne et externe, les interstices entre les tubes entre eux et entre les parois sensiblement cylindriques formant un espace de passage débouchant d'un côté au niveau du nez de l'embout et destiné à être relié par ailleurs à l'alimentation en gaz non porteur, le cylindre interne étant muni d'une fermeture frontale au niveau du nez de l'embout, tandis qu'il comporte des orifices faisant communiquer l'espace de passage intersticiel avec son volume intérieur creux, ce volume étant lui-même destiné à être relié à l'alimentation en gaz non porteur.This object is achieved according to the invention by a nozzle adaptable at the end of a gunning lance to project a refractory powder through a flame, the lance being connected to a supply of oxidizing gas, combustible gas and refractory powder, one of the gases being the gas carrying the powder in the nozzle, this nozzle, generally cylindrical in shape, comprising a plurality of individual tubes arranged in at least one ring of tubes coaxial with the nozzle, opening out 'one side at the nose of the nozzle, and intended to be connected on the other side to the supply of refractory powder and carrier gas, said plurality of tubes being disposed between two substantially cylindrical walls of two coaxial cylinders respectively internal and external, the interstices between the tubes between them and between the substantially cylindrical walls forming a passage space opening out on one side at the level of the nose of the nozzle and intended to be connected moreover to the supply. in non-carrier gas, the internal cylinder being provided with a front closure at the nose of the nozzle, while it has orifices making the interstitial passage space communicate with its hollow interior volume, this volume being itself even intended to be connected to the non-carrier gas supply.

Il a été observé que le fractionnement de la poudre et de la flamme donne une flamme plus chaude, mieux répartie, c'est-à-dire conduisant à une bonne homogénéité de température au-delà des dards. Les particules de poudre se trouvent être également plus homogènes en pression et vitesses. Comme on obtient une flamme longue, le temps de contact des particules et de la flamme est suffisant pour assurer une température élevée de la poudre. Le produit rejeté est homogène et de faible porosité. Le rendement est élevé.It has been observed that the fractionation of the powder and of the flame gives a warmer, better distributed flame, that is to say leading to a good temperature uniformity beyond the darts. The powder particles are also found to be more homogeneous in pressure and velocities. As a long flame is obtained, the contact time of the particles and the flame is sufficient to ensure a high temperature of the powder. The rejected product is homogeneous and of low porosity. The yield is high.

L'extrême simplicité de construction du dispositif selon l'invention permet une adaptation très souple au besoin; ainsi, il suffit pour augmenter la puissance, d'ajouter une ou plusieurs couronnes de tubes.The extreme simplicity of construction of the device according to the invention allows very flexible adaptation if necessary; thus, it is enough to increase the power, to add one or more crowns of tubes.

Par ailleurs, l'invention autorise l'utilisation d'un système de distribution entièrement pneumatique, mieux adapté que les systèmes à distributeur mécanique. Avantageusement, les tubes d'une même couronne sont disposés de façon contiguë, au moins au niveau du nez de l'embout.Furthermore, the invention allows the use of a fully pneumatic distribution system, better suited than mechanical distributor systems. Advantageously, the tubes of the same ring are arranged contiguously, at least at the nose of the nozzle.

Avantageusement, les couronnes de tubes sont disposées de façon sensiblement contiguë entre elles et vis-à-vis des parois cylindriques, au moins au niveau du nez de l'embout, le rapport des surfaces de sortie ainsi obtenues pour les différents conduits (tubes d'une part, interstices d'autre part) permettant une bonne combinaison des débits et des pressions.Advantageously, the tube crowns are arranged substantially contiguous with one another and with respect to the cylindrical walls, at least at the level of the nose of the end piece, the ratio of the outlet surfaces thus obtained for the various conduits (tubes on the one hand, interstices on the other hand) allowing a good combination of flow rates and pressures.

Selon une caractéristique très intéressante de l'invention, l'embout est adaptable à l'extrémité d'une lance de gunitage du type comportant un conduit central relié à l'alimentation en gaz non porteur et entouré d'un conduit annulaire relié à l'alimentation en gaz porteur et une poudre réfractaire.According to a very advantageous characteristic of the invention, the endpiece is adaptable to the end of a gunning lance of the type comprising a central duct connected to the supply of non-carrier gas and surrounded by an annular duct connected to the carrier gas supply and refractory powder.

Selon un mode de réalisation de l'invention, l'embout comporte au moins trente tubes.According to one embodiment of the invention, the end piece comprises at least thirty tubes.

D'autres avantages et caractéristiques de l'invention ressortiront de la description suivante d'un mode préféré de réalisation, en se référant au dessin annexé sur lequel:

  • - la figure 1 représente en coupe longitudinale un embout conforme à l'invention adapté sur l'extrémité d'une lance de gunitage traditionnelle;
  • - la figure 2 est une vue de gauche du nez de l'embout de la figure 1.
Other advantages and characteristics of the invention will emerge from the following description of a preferred embodiment, with reference to the attached drawing in which:
  • - Figure 1 shows in longitudinal section a nozzle according to the invention adapted on the end of a traditional gunning lance;
  • - Figure 2 is a left view of the nose of the tip of Figure 1.

L'embout 1, assujetti à la lance de gunitage 2, comporte un barillet 3 porte-tubes maintenu sur l'extrémité frontale de la lance 2 au moyen d'une bague de maintien en acier inoxydable 4 brasée en 5 et 6 au barillet 3 et au contour cylindrique de la lance 2.The nozzle 1, subject to the gunning lance 2, comprises a barrel 3 tube holder maintained on the front end of the lance 2 by means of a stainless steel retaining ring 4 brazed at 5 and 6 to the barrel 3 and the cylindrical outline of the lance 2.

Le barillet d'acier inoxydable 3 comporte un alésage central 7 de relativement grand diamètre et deux couronnes d'alésage 8a et 8b dans lesquels s'insèrent 35 tubes de cuivre répartis sur deux couronnes de tubes 9a et 9b de 150 m de long et 3,8 mm de diamètre intérieur fixés à une de leurs extrémités par des brasures 10.The stainless steel barrel 3 comprises a central bore 7 of relatively large diameter and two bore crowns 8a and 8b into which 35 copper tubes are inserted distributed over two crowns of tubes 9a and 9b of 150 m long and 3 , 8 mm inside diameter fixed at one of their ends by solder 10.

Les tubes 9a et 9b forment à leur autre extrémité le nez 11 de l'embout 1: ils sont contigus les uns aux autres à ce niveau, et sont enserrés entre les extrémités de deux parois sensiblement cylindriques respectivement interne 12 et externe 13.The tubes 9a and 9b form at their other end the nose 11 of the end piece 1: they are contiguous to each other at this level, and are sandwiched between the ends of two substantially cylindrical walls, internal 12 and external 13 respectively.

La paroi externe 13 en cuivre ceinture la couronne de tubes 9b et est brasée sur le barillet 3. Quoique pouvant être qualifiée de sensiblement cylindrique, elle a, dans le mode de réalisation représenté, en fait une faible conicité de l'ordre de 3% adaptée à la convergence des tubes 9. La paroi 13 peut faire saillie légèrement au-delà du nez 11 de l'embout 1.The external wall 13 of copper surrounds the crown of tubes 9b and is brazed on the barrel 3. Although it can be described as substantially cylindrical, it has, in the embodiment shown, in fact a low taper of the order of 3% adapted to the convergence of the tubes 9. The wall 13 can project slightly beyond the nose 11 of the nozzle 1.

La paroi interne 12 a la forme d'un cylindre généralement creux, arasant le nez 11 de l'embout 1, fermé de ce côté par une paroi frontale 14 ménageant une cavité recevant un réfractaire isolant 15.The internal wall 12 has the shape of a generally hollow cylinder, leveling the nose 11 of the end piece 1, closed on this side by a front wall 14 providing a cavity receiving an insulating refractory 15.

La paroi cylindrique 12 traverse l'alésage central 7 du barillet dans lequel elle est centrée par des nervures de centrage 16. Elle comporte un épaulement 17 au voisinage du nez de la lance 2.The cylindrical wall 12 passes through the central bore 7 of the barrel in which it is centered by centering ribs 16. It has a shoulder 17 in the vicinity of the nose of the lance 2.

La lance 2 comporte un conduit central 18 relié à une alimentation en gaz non porteur de poudre réfractaire, par exemple le comburant (ici de l'oxygène). Le conduit central 18 est séparé par une paroi annulaire 19 d'un conduit annulaire 20 relié à une alimentation en poudre réfractaire et en gaz porteur, par exemple Is gaz combustible.The lance 2 comprises a central duct 18 connected to a supply of gas which does not carry refractory powder, for example the oxidizer (here oxygen). The central conduit 18 is separated by an annular wall 19 of an annular conduit 20 connected to a supply of refractory powder and carrier gas, for example Is combustible gas.

L'épaulement 17 a un contour conique 21 qui ménage avec un contour également conique 22 du barillet 3 un passage annulaire conduisant la poudre réfractoire véhiculée par son gaz porteur depuis la sortie du conduit annulsire 20 jusqu'aux entrées des tubes 9. Un joint en cuivre 23 assurs l'étanchéité entre ledit passage annulaire et l'espace interstitiel entre les tubes 9 et les parois 12 et 13.The shoulder 17 has a conical contour 21 which forms an annular passage with an equally conical contour 22 of the barrel 3 leading the refractory powder conveyed by its carrier gas from the outlet of the annulus 20 to the inlets of the tubes 9. A joint in copper 23 ensures the seal between said annular passage and the interstitial space between the tubes 9 and the walls 12 and 13.

La paroi cylindrique 12 se prolonge vers l'intérieur du conduit 18 de la lance 2 et vient porter sur une portée 25 d'un tube d'adaptation 26 auquel elle est brasée en 27.The cylindrical wall 12 extends towards the inside of the duct 18 of the lance 2 and comes to bear on a surface 25 of an adapter tube 26 to which it is brazed at 27.

Huit orifices 28 font passer l'oxygène arrivant par le conduit central 18, dans l'espace de passage interstitiel 24 duquel il débouche au niveau du nez 11 de l'embout.Eight orifices 28 pass the oxygen arriving through the central duct 18, into the interstitial passage space 24 from which it opens at the level of the nose 11 of the nozzle.

Une mince bague de laiton 29 (par exemple 1/2 mm d'épsisseur) peut être interposée entre les deux couronnes de tubes 9a et 9b, sur une petite longueur (15 mm par exemple).A thin brass ring 29 (for example 1/2 mm of splicer) can be interposed between the two tube crowns 9a and 9b, over a short length (15 mm for example).

Le fonctionnement du dispositif est clair: en injectant dans la lance d'une part l'oxygène gazeux et d'autre part la poudre réfractaire portée par le gaz combustible, la poudre et la flamme sont fractionnées, ce qui autorise un échauffement maximal de la poudre sans mettre en jeu la température de la paroi.The operation of the device is clear: by injecting into the lance on the one hand gaseous oxygen and on the other hand the refractory powder carried by the combustible gas, the powder and the flame are fractionated, which allows maximum heating of the powder without involving the temperature of the wall.

L'embout de l'invention est donc particulièrement bien adapté à la projection de produits à haute réfractarité dont l'utilisation est nécessaire en aciérie.The tip of the invention is therefore particularly well suited to the projection of products with high refractoriness whose use is necessary in steel works.

Claims (9)

1. Nozzle adaptable to the end of a gunite spraying pipe for spraying a refractory powder across a flame, said pipe being connected to a supply of oxydant gas, combustible gas and refractory powder, one of said gases being the carrier gas for the powder in the pipe, nozzle, said nozzle (1) of a substantially cylindrical shape, comprising a plurality of individual tubes (9) disposed in at least one ring (9a, 9b) of tubes coaxial to the nozzle (1), opening out on one side at the level of the mouth (11) of the nozzle (1), and adapted to be connected on the other side to the supply of refractory powder and carrier gas (20), said plurality of tubes (9) being disposed between two substantially cylindrical walls of two coaxial cylinders, one on the inside (12) and one on the outside (13), the gaps (24) between the tubes (9) themselves and between the tubes and the substantially cylindrical walls forming a space of passage which opens out on one side at the level of the mouth (11) of the nozzle (1) and is adapted to be connected otherwise to the supply of non-carrier gas (18), the inside cylinder (12) being equipped with a front seal (14, 15) at the level of the mouth (11) of the nozzle (1) , whereas it comprises openings (28) for communication between the space of passage (24) between the tubes and its hollow inside volume, aaid volume being itself adapted to be connected to the supply of non-carrier gas (18).
2. Nozzle according to claim 1, charactarized in that the tubes (9) in one ring are in contiguous arrangement, at least at the level of the mouth (11) of the nozzle.
3. Nozzle according to either of claims 1 and 2, characterized in that the ring(s) (9a, 9b) of tubes are in substantially contiguous arrangement with respect to each other and with respect to the cylindrical walls (12, 13), at least at the level of the mouth (11) of the nozzle.
4. Nozzle according to claim 3, characterized in that a thin supporting ring (29) is inserted between two substantially contiguous rings (9a, 9b), at least at the level of the mouth (11) of the nozzle.
5. Nozzle according to any of the above claims, characterized in that the tubes (9) are made of copper.
6. Nozzle according to any of the above claims, characterized in that it comprises at least thirty tubes (9) distributed over two rings (9a, 9b).
7. A construction formed by an nozzle according to any of the above claims and a gunite spraying pipe, characterized in that the gunite spraying pipe (2) comprises a central conduit (18) connected to the supply of non-carrier gas and surrounded by an annular conduit (20) connected to the supply of carrier gas and refractory powder.
8. The use of the nozzle according to any of claims 1 to 6 or of the construction according to claim 7 for spraying a refractory powder across a flame, having the combustible gas as the carrier gas.
9. The use of the nozzle according to any of claims 1 to 6 or of the construction according to claim 7 for spraying a refractory powder across a flame, having oxygen as the oxydant gas.
EP83401750A 1982-09-13 1983-09-06 Nozzle for hot guniting Expired EP0103515B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401750T ATE26884T1 (en) 1982-09-13 1983-09-06 NOZZLE FOR FLAME SPRAYING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8215461A FR2533020A1 (en) 1982-09-13 1982-09-13 HOT TUNNEL NOZZLE
FR8215461 1982-09-13

Publications (2)

Publication Number Publication Date
EP0103515A1 EP0103515A1 (en) 1984-03-21
EP0103515B1 true EP0103515B1 (en) 1987-04-29

Family

ID=9277405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401750A Expired EP0103515B1 (en) 1982-09-13 1983-09-06 Nozzle for hot guniting

Country Status (10)

Country Link
US (1) US4562961A (en)
EP (1) EP0103515B1 (en)
JP (1) JPS5966368A (en)
AT (1) ATE26884T1 (en)
AU (1) AU564811B2 (en)
CA (1) CA1200689A (en)
DE (1) DE3371246D1 (en)
ES (1) ES8405507A1 (en)
FR (1) FR2533020A1 (en)
ZA (1) ZA836319B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2170122B (en) * 1985-01-26 1988-11-30 Glaverbel Process of forming a refractory mass and lance for spraying particulate exothermically oxidisable material
KR960004799B1 (en) * 1986-12-22 1996-04-13 가와사끼 세이데쓰 가부시끼가이샤 Method and apparatus for spray coating or refractory material to refractory construction
US5262206A (en) * 1988-09-20 1993-11-16 Plasma Technik Ag Method for making an abradable material by thermal spraying
US5019686A (en) * 1988-09-20 1991-05-28 Alloy Metals, Inc. High-velocity flame spray apparatus and method of forming materials
US5206059A (en) * 1988-09-20 1993-04-27 Plasma-Technik Ag Method of forming metal-matrix composites and composite materials
US5135166A (en) * 1991-05-08 1992-08-04 Plasma-Technik Ag High-velocity thermal spray apparatus
US5520334A (en) * 1993-01-21 1996-05-28 White; Randall R. Air and fuel mixing chamber for a tuneable high velocity thermal spray gun
US5405085A (en) * 1993-01-21 1995-04-11 White; Randall R. Tuneable high velocity thermal spray gun
US5445325A (en) * 1993-01-21 1995-08-29 White; Randall R. Tuneable high velocity thermal spray gun
US5486676A (en) * 1994-11-14 1996-01-23 General Electric Company Coaxial single point powder feed nozzle
US5692678A (en) * 1995-05-01 1997-12-02 Kawasaki Steel Corporation Flame spraying burner
US6579085B1 (en) 2000-05-05 2003-06-17 The Boc Group, Inc. Burner and combustion method for the production of flame jet sheets in industrial furnaces
US7854397B2 (en) * 2005-01-21 2010-12-21 Specialty Minerals (Michigan) Inc. Long throw shotcrete nozzle
CN103075887A (en) * 2013-01-24 2013-05-01 张立生 Supersonic speed high-temperature ceramic repair welding gun

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1758473A (en) * 1924-06-30 1930-05-13 Schoop Max Ulrich Coating articles, particularly with metals
US1721381A (en) * 1928-02-02 1929-07-16 Gen Electric Gas burner
US2544259A (en) * 1944-11-25 1951-03-06 Duccini Gaetano Metallizing spray gun
US3111267A (en) * 1957-04-18 1963-11-19 Metco Inc Apparatus for applying heat-fusible coatings on solid objects
NL274228A (en) * 1961-02-01
US3118758A (en) * 1961-03-27 1964-01-21 Union Carbide Canada Ltd Post-mixed oxy-fuel oxide reduction
GB933839A (en) * 1961-06-12 1963-08-14 Pollock & Peel Ltd Improvements in nozzles and a method of making the same
DE1265630B (en) * 1962-02-08 1968-04-04 Metallgesellschaft Ag Flame spray gun, especially for oxide ceramic powders
US3814327A (en) * 1971-04-06 1974-06-04 Gen Electric Nozzle for chemical reaction processes
LU80997A1 (en) * 1978-03-09 1979-06-18 Centre Rech Metallurgique PROCESS FOR THE PROTECTION OF REFRACTORY WALLS OF METALLURGIC CONTAINERS
DE7908047U1 (en) * 1979-02-16 1982-04-08 Castolin S.A., 1025 St. Sulpice, Vaud BURNER NOZZLE FOR FLAME SPRAYER

Also Published As

Publication number Publication date
AU1853383A (en) 1984-03-22
AU564811B2 (en) 1987-08-27
EP0103515A1 (en) 1984-03-21
FR2533020B1 (en) 1985-04-19
ZA836319B (en) 1984-04-25
CA1200689A (en) 1986-02-18
US4562961A (en) 1986-01-07
ATE26884T1 (en) 1987-05-15
DE3371246D1 (en) 1987-06-04
FR2533020A1 (en) 1984-03-16
ES525581A0 (en) 1984-06-01
JPS5966368A (en) 1984-04-14
ES8405507A1 (en) 1984-06-01

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