EP0473521A1 - Method and device for feeding a powder or granular material into a continuous casting mold - Google Patents

Method and device for feeding a powder or granular material into a continuous casting mold Download PDF

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Publication number
EP0473521A1
EP0473521A1 EP91470022A EP91470022A EP0473521A1 EP 0473521 A1 EP0473521 A1 EP 0473521A1 EP 91470022 A EP91470022 A EP 91470022A EP 91470022 A EP91470022 A EP 91470022A EP 0473521 A1 EP0473521 A1 EP 0473521A1
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EP
European Patent Office
Prior art keywords
valve
hopper
powder
opening
detector
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.)
Granted
Application number
EP91470022A
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German (de)
French (fr)
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EP0473521B1 (en
Inventor
Ghislain Hubert
Patrick Ominetti
André Klein
Raymond Pilloy
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.)
Sollac SA
Techmetal Promotion SA
Original Assignee
Sollac SA
Techmetal Promotion SA
Lorraine de Laminage Continu SA SOLLAC
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Application filed by Sollac SA, Techmetal Promotion SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Priority to AT91470022T priority Critical patent/ATE100005T1/en
Publication of EP0473521A1 publication Critical patent/EP0473521A1/en
Application granted granted Critical
Publication of EP0473521B1 publication Critical patent/EP0473521B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like

Definitions

  • the present invention relates to the continuous casting of metals and in particular steel.
  • the invention relates to the supply and the deposition on the surface of the liquid metal in a continuous casting mold, of a layer of a powdery or granulated material, this material having in particular the function of thermally insulating the metal bath in fusion, to avoid reoxidation of the metal and to provide lubrication of the walls of the mold.
  • this material will hereinafter be called “powder”, it being understood that its particle size and the shape of the grains can vary widely.
  • This powder is liquefied on contact with the liquid metal and infiltrates between the metal and the walls of the mold, thus playing the role of lubricant.
  • This device makes it possible to ensure an automatic supply of powder, because when the thickness of the latter tends to decrease, the powder flows in the conduit by gravity until the upper level of the layer reaches the level of the discharge port of the conduit, thereby interrupting the flow.
  • this takes advantage of the ability of the powder to spread substantially uniformly over the entire section of the ingot mold while taking advantage of the characteristics of the pin materials which are deposited in heaps at the outlet of the conduit. power supply.
  • This system makes it possible to know the average powder consumption, for example for a casting, by measuring the quantity of powder introduced into the feed hopper.
  • instant consumption or over short periods, cannot be determined.
  • the invention aims to solve this problem, and therefore to know the instantaneous consumption of powder, to enable this consumption to be linked with instantaneous casting conditions such as extraction speed, casting temperature, nature of the powder, frequency and amplitude of the mold's oscillations, and the parameters specific to each casting such as format of the cast product, nature of the metal, etc.
  • the invention relates to a supply device, for depositing on the surface of a liquid metal contained in a continuous casting mold, a layer of a powdery or granulated material, comprising a supply conduit of which a permanently open lower discharge end is situated above said surface of the metal at a height equal to or slightly greater than a target thickness of the layer of said material, and means for permanent supply of said material in said conduit.
  • this device is characterized in that it comprises an upper main hopper provided with a drain pipe, the lower end of which penetrates, without being rigidly connected to it, in a lower secondary hopper opening into the conduit of supply, a shut-off valve and a material flow detector, placed on the drainage pipe, means for controlling the valve according to the indications provided by the flow detector, means for weighing the upper hopper, and calculation means for determining the material flow as a function of the time between two successive closings or openings of said valve, and of the quantity of material flowing from the upper hopper into the lower hopper.
  • the invention also relates to a method of feeding and depositing, on the surface of a liquid metal contained in a continuous casting mold, and during casting, a layer of a powdery or granulated material.
  • the lower end of the supply duct is positioned above the surface of the metal at a height equal to or slightly greater than a set thickness of the layer of said material, it is filled the upper hopper with said material, and, in order to continuously measure the consumption of said material during the casting of said metal, the valve is controlled to close each time the flow detector indicates a zero flow, the time t is recorded at each closure or opening, and, after each valve closure, the weighing of the upper hopper and the measured value is recorded, and the material consumption is deduced therefrom during each time interval between two successive closings or openings of the valve.
  • the valve is ordered to open after a predetermined period, starting from its closing. It is then possible to determine the consumption of material throughout the casting, at constant predetermined time intervals, or variable as a function of the progress of the casting.
  • a detector for the presence of the material in the lower hopper is used, located at a predetermined distance below the end of the drain piping, and the valve is opened when this detector indicates an absence. of material, i.e. the lower hopper has emptied to the level of the presence detector.
  • a continuous casting mold 1 supplied with liquid metal 2, conventionally by means of supply, not shown.
  • a layer of covering powder 3 which melts on contact with the metal, forming a liquid film 4 of slag which gradually flows towards the walls of the mold and infiltrates between them and the metal, where it acts as a lubricant.
  • the powder supply is ensured by a supply conduit 10 which opens by its lower end 11 open continuously, above the surface of the metal at a height equal to or slightly greater than a set thickness of the powder layer and slag.
  • This conduit being permanently supplied with powder, the latter pours into the mold until the layer thus formed comes to close the orifice 11, thus interrupting the arrival of powder.
  • the invention aims to allow the almost instantaneous measurement, relative to the duration of a pour, of the consumption of powder.
  • the device comprises a main hopper 13 provided with load cells 14.
  • This main hopper carries at its lower part a drain pipe 15 on which is placed a flow detector 16 and, under the latter, a valve 17.
  • the lower end of the pipe 15 penetrates, without being rigidly fixed thereto, into a secondary hopper 18 of lower capacity, the outlet orifice of which is connected to the supply conduit 10.
  • the load cells 14, the flow detector 16, and the valve 17 are connected to a control and command cabinet 19, itself connected by the link 20 to a process computer of the installation, not shown, and to means of visualization or graphical representation 21.
  • the main hopper 13 being filled with powder 22 and the valve 17 being open, the powder flows into the secondary hopper 18 then is directed by the supply conduit 10 into the ingot mold, where it spreads over the surface of the metal 2 until the powder layer 3 arrives substantially at the orifice 11 at the end of the conduit 10 and blocks the flow, as explained above.
  • the powder then fills the conduit 10 then the intermediate hopper 18 until the level of the powder in this hopper reaches the lower end of the tubing 15 blocking, in a similar manner to that which occurs in the mold. flow in this piping.
  • the device can then operate in two different ways, corresponding respectively to the two variants mentioned above.
  • the opening of the valve 17 is controlled after a predetermined period from its closing.
  • the level of powder therein drops, allowing the powder contained in the conduit 10 and the hopper to flow.
  • the level of powder falling in this hopper 18 releases the lower orifice piping 15, the part located under the valve 17 is empty.
  • the internal volume of the pipe part 15 located under the valve 17 is preferably determined to be as small as possible, there is no there is more interaction between the main hopper and the secondary hopper; the weighing of the main hopper is then carried out by means of load cells 14, and the value of the measurement recorded.
  • the opening of the valve 17 is controlled, the powder flows again into the piping 15 and fills the secondary hopper 18 up to again blocking the flow, the process then repeating in a similar manner.
  • the flow rate or the consumption of powder can then be easily calculated from the time between two successive closings or openings of the valve and from the difference between two corresponding successive weighings, this calculation being carried out by the control apparatus. and regulation and / or the process computer of the casting installation, and the results presented by the display device 21 for example in the form of a consumption curve as a function of time.
  • valve closing time may not be validated until just before the next opening.
  • the closing time will preferably be short, in order to have the shortest possible reaction time on the process, being indeed understood that the consumption at a given instant can only be evaluated at the end of the device operating cycle, that is to say practically only when the opening of the valve 17 is controlled to complete the secondary hopper.
  • the device further comprises a detector 23 of the presence of powder, placed on the secondary hopper or on the supply duct, and also connected to the control cabinet 19. In this case the opening of the valve 17 is controlled when the presence detector 23 signals an absence of powder.
  • the device then operates in the following manner, starting from the phase shown in the drawing.
  • the powder level in the secondary hopper drops until reaching the presence detector 23, which then sends to the control cabinet 19 a signal of absence of powder, which in turn causes the opening of the valve 17.
  • the powder then fills the secondary hopper 18 up to the level of the lower end of the pipe 15, blocking the flow in this pipe.
  • the flow detector 16 then reacts and controls the closing of the valve.
  • the quantity of powder consumed in each cycle is substantially constant, since corresponding to the volume of the hopper 18 and of the pipes, between the presence detector 23 and the valve 17, to the quantity close to the powder consumed between the moment of absence detection by the detector 23 and the end of filling of the secondary hopper.
  • the time between two successive openings or closings of the valve varies according to the consumption in the mold.
  • the presence detector 23 will be placed far enough upstream of the end 11 of the conduit 10, to avoid, in the event of significant consumption, a break in the supply of powder to the ingot mold, which could be due to a possible delay. in the powder flow between the absence detection and the arrival of powder in this conduit.
  • the presence detector 23 could also be placed directly on the hopper 18 without the principle of operation of the device being modified.
  • the secondary hopper 18 can also be constituted by the upper end of the supply duct, which will then be sufficiently flared to allow penetration of the lower end of the piping 15.

Abstract

The device comprises a main hopper 13 provided with balances 14 and equipped with a draining duct 15 on which are mounted a valve 17 and a flow detector 16. The lower end of the duct penetrates into a secondary hopper 18 connected to a pipe 10 for feeding powder to the mould 1. <??>The powder 22 flows from the main hopper 13 into the secondary hopper 18 and is then directed via the pipe 10 into the mould where it spreads over the surface of the cast metal 2. When the level of powder in the secondary hopper reaches the lower end of the duct 15, the flow therein is cancelled and the detector 16 commands the closure of the valve. Its reopening is commanded after a certain period of time or when the powder-presence detector 23 indicates the absence of powder. It is thus possible, by measuring the time between two successive closures or openings of the valves and by weighing the upper hopper, to be continuously informed of the powder consumption. <IMAGE>

Description

La présente invention concerne la coulée continue des métaux et en particulier de l'acier.The present invention relates to the continuous casting of metals and in particular steel.

Plus précisément l'invention concerne l'alimentation et le dépôt à la surface du métal liquide en lingotière de coulée continue, d'une couche d'un matériau poudreux ou granulé, ce matériau ayant notamment pour fonction d'isoler thermiquement le bain de métal en fusion, d'éviter la réoxydation du métal et d'assurer la lubrification des parois de la lingotière. Par commodité, ce matériau sera appelé par la suite "poudre" étant bien entendu que sa granulométrie, et la forme des grains peuvent largement varier. Cette poudre est liquéfiée au contact du métal liquide et s'infiltre entre le métal et les parois de la lingotière, jouant ainsi le rôle de lubrifiant. Il en résulte une consommation continue de poudre lors de la coulée, qu'il est nécessaire de compenser par un apport, lequel varie en fonction des caractéristiques de la poudre, et de celles de l'installation de coulée et du métal coulé. De plus la consommation de poudre peut varier en cours de coulée en fonction des différents paramètres du process, et notamment de la température du métal coulé.More precisely, the invention relates to the supply and the deposition on the surface of the liquid metal in a continuous casting mold, of a layer of a powdery or granulated material, this material having in particular the function of thermally insulating the metal bath in fusion, to avoid reoxidation of the metal and to provide lubrication of the walls of the mold. For convenience, this material will hereinafter be called "powder", it being understood that its particle size and the shape of the grains can vary widely. This powder is liquefied on contact with the liquid metal and infiltrates between the metal and the walls of the mold, thus playing the role of lubricant. This results in a continuous consumption of powder during casting, which it is necessary to compensate with an addition, which varies according to the characteristics of the powder, and of those of the casting installation and of the metal cast. In addition, the powder consumption can vary during casting depending on the various process parameters, and in particular the temperature of the cast metal.

Pour assurer un niveau constant de poudre et donc la régularité de l'épaisseur de la couche de celle-ci, il est connu d'en effectuer l'alimentation par gravité par un conduit issu d'une trémie contenant ledit matériau et placée au-dessus de la lingotière, ce conduit débouchant dans la lingotière au-dessus de la surface du métal coulé, à une distance de celle-ci correspondant à l'épaisseur souhaitée de poudre, à l'état solide ou fondu. Un tel dispositif est notamment décrit dans le document FR-A-2522551, dont l'enseignement est inclus ici par référence.To ensure a constant level of powder and therefore the regularity of the thickness of the layer thereof, it is known to supply it by gravity through a conduit coming from a hopper containing said material and placed above it. above the ingot mold, this conduit opening into the ingot mold above the surface of the cast metal, at a distance therefrom corresponding to the desired thickness of powder, in the solid or molten state. Such a device is notably described in document FR-A-2522551, the teaching of which is included here by reference.

Ce dispositif permet d'assurer une alimentation automatique de poudre, du fait que, lorsque l'épaisseur de celle-ci tend à diminuer, la poudre s'écoule dans le conduit par gravité jusqu'à ce que le niveau supérieur de la couche atteigne le niveau de l'orifice de décharge du conduit, interrompant ainsi le débit. On tire ainsi parti, pour automatiser l'alimentation en poudre, de la faculté de la poudre à se répandre sensiblement uniformément sur toute la section de la lingotière tout en profitant des caractéristiques des matériaux en poins qui se déposent en tas à la sortie du conduit d'alimentation.This device makes it possible to ensure an automatic supply of powder, because when the thickness of the latter tends to decrease, the powder flows in the conduit by gravity until the upper level of the layer reaches the level of the discharge port of the conduit, thereby interrupting the flow. In order to automate the feeding of powder, this takes advantage of the ability of the powder to spread substantially uniformly over the entire section of the ingot mold while taking advantage of the characteristics of the pin materials which are deposited in heaps at the outlet of the conduit. power supply.

Ce système permet de connaître la consommation moyenne de poudre, par exemple pour une coulée, en mesurant la quantité de poudre introduite dans la trémie d'alimentation. Par contre la consommation instantanée, ou sur de faibles périodes, ne peut être déterminée.This system makes it possible to know the average powder consumption, for example for a casting, by measuring the quantity of powder introduced into the feed hopper. However, instant consumption, or over short periods, cannot be determined.

L'invention a pour but de résoudre ce problème, et donc de connaître la consommation instantanée de poudre, pour permettre de relier cette consommation avec les conditions instantanées de coulée telles que vitesse d'extraction, température de coulée, nature de la poudre, fréquence et amplitude des oscillations de la lingotière, et les paramètres spécifiques à chaque coulée tels que format du produit coulé, nature du métal, etc...The invention aims to solve this problem, and therefore to know the instantaneous consumption of powder, to enable this consumption to be linked with instantaneous casting conditions such as extraction speed, casting temperature, nature of the powder, frequency and amplitude of the mold's oscillations, and the parameters specific to each casting such as format of the cast product, nature of the metal, etc.

Avec ces objectifs en vue, l'invention a pour objet un dispositif d'alimentation, pour le dépôt sur la surface d'un métal liquide contenu dans une lingotière de coulée continue, d'une couche d'un matériau poudreux ou granulé, comprenant un conduit d'alimentation dont une extrémité inférieure de décharge ouverte en permanence est située au-dessus de ladite surface du métal à une hauteur égale ou légèrement supérieure à une épaisseur de consigne de la couche dudit matériau, et des moyens d'alimentation permanente dudit matériau dans ledit conduit.With these objectives in view, the invention relates to a supply device, for depositing on the surface of a liquid metal contained in a continuous casting mold, a layer of a powdery or granulated material, comprising a supply conduit of which a permanently open lower discharge end is situated above said surface of the metal at a height equal to or slightly greater than a target thickness of the layer of said material, and means for permanent supply of said material in said conduit.

Selon l'invention, ce dispositif est caractérisé en ce qu'il comporte une trémie principale supérieure pourvue d'une tuyauterie de vidange dont l'extrémité inférieure pénètre, sans y être rigidement liée, dans une trémie secondaire inférieure débouchant dans le conduit d'alimentation, une vanne d'obturation et un détecteur de débit du matériau, placés sur la tuyauterie de vidange, des moyens de commande de la vanne en fonction des indications fournies par le détecteur de débit, des moyens de pesée de la trémie supérieure, et des moyens de calcul pour déterminer le débit du matériau en fonction du temps entre deux fermetures ou ouvertures successives de ladite vanne, et de la quantité de matériau s'écoulant de la trémie supérieure dans la trémie inférieure.According to the invention, this device is characterized in that it comprises an upper main hopper provided with a drain pipe, the lower end of which penetrates, without being rigidly connected to it, in a lower secondary hopper opening into the conduit of supply, a shut-off valve and a material flow detector, placed on the drainage pipe, means for controlling the valve according to the indications provided by the flow detector, means for weighing the upper hopper, and calculation means for determining the material flow as a function of the time between two successive closings or openings of said valve, and of the quantity of material flowing from the upper hopper into the lower hopper.

L'invention a aussi pour objet un procédé d'alimentation et de dépôt, sur la surface d'un métal liquide contenu dans une lingotière de coulée continue, et au cours de la coulée, d'une couche d'un matériau poudreux ou granulé selon lequel on utilise le dispositif décrit ci-dessus, on positionne l'extrémité inférieure du conduit d'alimentation au-dessus de la surface du métal à une hauteur égale ou légèrement supérieure à une épaisseur de consigne de la couche dudit matériau, on emplit la trémie supérieure avec ledit matériau, et, dans le but de mesurer en permanence la consommation dudit matériau lors de la coulée dudit métal, on commande la fermeture de la vanne à chaque fois que le détecteur de débit indique un débit nul, on enregistre le temps t à chaque fermeture ou ouverture, et, après chaque fermeture de la vanne, on effectue la pesée de la trémie supérieure et on enregistre la valeur mesurée, et on en déduit la consommation de matériau pendant chaque intervalle de temps entre deux fermetures ou ouvertures successives de la vanne.The invention also relates to a method of feeding and depositing, on the surface of a liquid metal contained in a continuous casting mold, and during casting, a layer of a powdery or granulated material. according to which the device described above is used, the lower end of the supply duct is positioned above the surface of the metal at a height equal to or slightly greater than a set thickness of the layer of said material, it is filled the upper hopper with said material, and, in order to continuously measure the consumption of said material during the casting of said metal, the valve is controlled to close each time the flow detector indicates a zero flow, the time t is recorded at each closure or opening, and, after each valve closure, the weighing of the upper hopper and the measured value is recorded, and the material consumption is deduced therefrom during each time interval between two successive closings or openings of the valve.

Selon une première variante, on commande l'ouverture de la vanne au bout d'une période prédéterminée, à compter de sa fermeture. On peut alors déterminer la consommation de matériau tout au long de la coulée, à intervalles de temps prédéterminés constants,ou variables en fonction de l'évolution de la coulée.According to a first variant, the valve is ordered to open after a predetermined period, starting from its closing. It is then possible to determine the consumption of material throughout the casting, at constant predetermined time intervals, or variable as a function of the progress of the casting.

Selon une seconde variante, on utilise un détecteur de présence du matériau dans la trémie inférieure, situé à une distance prédéterminée en dessous de l'extrémité de la tuyauterie de vidange, et on commande l'ouverture de la vanne lorsque ce détecteur indique une absence de matériau, c'est-à-dire que la trémie inférieure s'est vidée jusqu'au niveau du détecteur de présence. On pourra alors représenter la consommation comme la suite de périodes de durées variables correspondant au temps nécessaire pour consommer une quantité sensiblement constante de matériau.According to a second variant, a detector for the presence of the material in the lower hopper is used, located at a predetermined distance below the end of the drain piping, and the valve is opened when this detector indicates an absence. of material, i.e. the lower hopper has emptied to the level of the presence detector. We can then represent consumption as the series of periods of variable duration corresponding to the time necessary to consume a substantially constant amount of material.

D'autres caractéristiques et avantages apparaîtront dans la description qui a être faite à titre d'exemple de deux variantes d'un dispositif d'alimentation en poudre de couverture d'une installation de coulée continue, et de leur procédé de mise en oeuvre, conformément à l'invention.Other characteristics and advantages will appear in the description which has been given by way of example of two variants of a device for supplying powder to cover a continuous casting installation, and of their method of implementation, according to the invention.

On se reportera au dessin annexé dont l'unique figure est une vue schématique du dispositif.Reference is made to the appended drawing, the sole figure of which is a schematic view of the device.

Sur cette figure est représentée une lingotière de coulée continue 1 alimentée en métal liquide 2, de manière classique par des moyens d'alimentation non représentés. Au-dessus du métal se trouve une couche de poudre de couverture 3 qui fond au contact du métal en formant un film liquide 4 de laitier qui s'écoule progressivement vers les parois de la lingotière et s'infiltre entre-celles-ci et le métal, où il joue le rôle de lubrifiant.In this figure is shown a continuous casting mold 1 supplied with liquid metal 2, conventionally by means of supply, not shown. Above the metal is a layer of covering powder 3 which melts on contact with the metal, forming a liquid film 4 of slag which gradually flows towards the walls of the mold and infiltrates between them and the metal, where it acts as a lubricant.

Il y a ainsi lors de la coulée une consommation continue de poudre, qui doit être remplacée en permanence pour assurer une épaisseur sensiblement constante de la couche de poudre 3.There is thus a continuous consumption of powder during casting, which must be permanently replaced to ensure a substantially constant thickness of the powder layer 3.

L'alimentation en poudre est assurée par un conduit d'alimentation 10 qui débouche par son extrémité inférieure 11 ouverte en permanence, au-dessus de la surface du métal à une hauteur égale ou légèrement supérieure à une épaisseur de consigne de la couche de poudre et de laitier. Ce conduit étant approvisionné en permanence en poudre, celle-ci se déverse dans la lingotière jusqu'à ce que la couche ainsi formée vienne obturer l'orifice 11, interrompant ainsi l'arrivée de poudre. Ce principe d'alimentation et de régulation de l'épaisseur de la couche de poudre est décrit en détail dans le document FR-A-2522551 déjà cité, auquel on pourra se reporter pour plus d'informations.The powder supply is ensured by a supply conduit 10 which opens by its lower end 11 open continuously, above the surface of the metal at a height equal to or slightly greater than a set thickness of the powder layer and slag. This conduit being permanently supplied with powder, the latter pours into the mold until the layer thus formed comes to close the orifice 11, thus interrupting the arrival of powder. This principle of feeding and regulating the thickness of the powder layer is described in detail in the document FR-A-2522551 already cited, to which reference may be made for more information.

Ainsi que cela a déjà été indiqué, l'invention vise à permettre la mesure quasiment instantanée, par rapport à la durée d'une coulée, de la consommation de poudre. A cette fin le dispositif comporte une trémie principale 13 pourvue de pesons 14. Cette trémie principale porte à sa partie inférieure une tuyauterie de vidange 15 sur laquelle est placée un détecteur de débit 16 et, sous ce dernier, une vanne 17.As has already been indicated, the invention aims to allow the almost instantaneous measurement, relative to the duration of a pour, of the consumption of powder. To this end, the device comprises a main hopper 13 provided with load cells 14. This main hopper carries at its lower part a drain pipe 15 on which is placed a flow detector 16 and, under the latter, a valve 17.

L'extrémité inférieure de la tuyauterie 15 pénètre, sans y être rigidement fixée, dans une trémie secondaire 18 de plus faible capacité, dont l'orifice de sortie est relié au conduit d'alimentation 10.The lower end of the pipe 15 penetrates, without being rigidly fixed thereto, into a secondary hopper 18 of lower capacity, the outlet orifice of which is connected to the supply conduit 10.

Les pesons 14, le détecteur de débit 16, et la vanne 17 sont reliés à une armoire de contrôle et de commande 19, elle-même reliée par la liaison 20 à un calculateur de process de l'installation, non représenté, et à des moyens de visualisation ou de réprésentation graphique 21.The load cells 14, the flow detector 16, and the valve 17 are connected to a control and command cabinet 19, itself connected by the link 20 to a process computer of the installation, not shown, and to means of visualization or graphical representation 21.

On va maintenant décrire le fonctionnement de ce dispositif au cours d'une coulée.We will now describe the operation of this device during a casting.

La trémie principale 13 étant remplie de poudre 22 et la vanne 17 étant ouverte, la poudre s'écoule dans la trémie secondaire 18 puis est dirigée par le conduit d'alimentation 10 dans la lingotière, où elle se répand sur la surface du métal 2 jusqu'à ce que la couche de poudre 3 arrive sensiblement au niveau de l'orifice 11 d'extrémité du conduit 10 et bloque l'écoulement, comme expliqué précédemment.The main hopper 13 being filled with powder 22 and the valve 17 being open, the powder flows into the secondary hopper 18 then is directed by the supply conduit 10 into the ingot mold, where it spreads over the surface of the metal 2 until the powder layer 3 arrives substantially at the orifice 11 at the end of the conduit 10 and blocks the flow, as explained above.

La poudre remplit alors le conduit 10 puis la trémie intermédiaire 18 jusqu'à ce que le niveau de la poudre dans cette trémie atteigne l'extrémité inférieure de la tuyauterie 15 bloquant, de manière similaire à ce qui se produit dans la lingotière, l'écoulement dans cette tuyauterie. Le détecteur de débit 16, réagissant alors à ce débit nul, envoie un signal à l'armoire de contrôle 19 qui commande la fermeture de la vanne 17. C'est cet état qui est représenté sur le dessin annexé.The powder then fills the conduit 10 then the intermediate hopper 18 until the level of the powder in this hopper reaches the lower end of the tubing 15 blocking, in a similar manner to that which occurs in the mold. flow in this piping. The flow detector 16, then reacting to this flow null, sends a signal to the control cabinet 19 which controls the closing of the valve 17. It is this state which is shown in the attached drawing.

Le dispositif peut ensuite fonctionner de deux manières différentes, correspondant respectivement aux deux variantes précédemment évoquées.The device can then operate in two different ways, corresponding respectively to the two variants mentioned above.

Selon la première variante, l'ouverture de la vanne 17 est commandée au bout d'une période prédéterminée à compter de sa fermeture.According to the first variant, the opening of the valve 17 is controlled after a predetermined period from its closing.

Dans ce cas le fonctionnement se poursuit ainsi :In this case the operation continues as follows:

Du fait de la consommation de poudre en lingotière le niveau de poudre dans celle-ci baisse, autorisant l'écoulement de la poudre contenue dans le conduit 10 et la trémie 18. Le niveau de poudre baissant dans cette trémie 18 libère l'orifice inférieur de la tuyauterie 15 dont la partie située sous la vanne 17 se vide. Au bout d'un certain temps, dépendant de la consommation en lingotière, mais généralement assez court, notamment du fait que le volume interne de la partie de tuyauterie 15 située sous la vanne 17 est préférentiellement déterminé pour être le plus faible possible, il n'y a plus d'interaction entre la trémie principale et la trémie secondaire ; la pesée de la trémie principale est alors effectuée au moyen des pesons 14, et la valeur de la mesure enregistrée.Due to the consumption of powder in the ingot mold, the level of powder therein drops, allowing the powder contained in the conduit 10 and the hopper to flow. The level of powder falling in this hopper 18 releases the lower orifice piping 15, the part located under the valve 17 is empty. After a certain time, depending on consumption in the mold, but generally quite short, in particular because the internal volume of the pipe part 15 located under the valve 17 is preferably determined to be as small as possible, there is no there is more interaction between the main hopper and the secondary hopper; the weighing of the main hopper is then carried out by means of load cells 14, and the value of the measurement recorded.

Après un laps de temps prédéterminé en fonction de la consommation de poudre estimée et de la précision des mesures souhaitées, l'ouverture de la vanne 17 est commandée, la poudre s'écoule à nouveau dans la tuyauterie 15 et remplit la trémie secondaire 18 jusqu'à nouveau blocage de l'écoulement, le processus se répétant ensuite de manière similaire.After a predetermined period of time according to the estimated powder consumption and the precision of the desired measurements, the opening of the valve 17 is controlled, the powder flows again into the piping 15 and fills the secondary hopper 18 up to again blocking the flow, the process then repeating in a similar manner.

On comprendra aisément que le débit ou la consommation de poudre pourra alors être facilement calculé à partir de la durée entre deux fermetures ou ouvertures successives de la vanne et de la différence entre deux pesées successives correspondantes, ce calcul étant effectué par l'appareillage de commande et de régulation et/ou le calculateur de process de l'installation de coulée, et les résultats présentés par le dispositif de visualisation 21 par exemple sous forme d'une courbe de consommation en fonction du temps.It will be readily understood that the flow rate or the consumption of powder can then be easily calculated from the time between two successive closings or openings of the valve and from the difference between two corresponding successive weighings, this calculation being carried out by the control apparatus. and regulation and / or the process computer of the casting installation, and the results presented by the display device 21 for example in the form of a consumption curve as a function of time.

On notera que pour éviter de fixer un délai entre le moment de fermeture de la vanne et la pesée, cette dernière pourra n'être validée que juste avant l'ouverture suivante.Note that to avoid setting a delay between the valve closing time and weighing, the latter may not be validated until just before the next opening.

Plus le laps de temps entre la fermeture et l'ouverture de la vanne sera court, plus la consommatin déterminée sera réellement "instantanée". Toutefois si ce laps de temps est très court, la différence des pesées risque d'être faible et la précision des pesées moindre. De plus cette durée devra être suffisamment courte pour éviter, compte tenu de la capacité de la trémie secondaire, que celle-ci et le conduit d'alimentation ne viennent à se vider totalement.The shorter the time between closing and opening of the valve, the more "determined" the actual consumption will be. However, if this period of time is very short, the difference in the weighings may be small and the accuracy of the weighings less. In addition, this duration must be short enough to avoid, taking into account the capacity of the secondary hopper, that the latter and the supply duct do not completely empty.

On notera encore que, si l'on veut faire intervenir les mesures de consommation de proudre dans la conduite du process de coulée, la durée de fermeture sera préférentiellement brève, pour avoir un temps de réaction sur le process le plus court possible, étant bien entendu que la consommation à un instant donné ne peut être évaluée qu'à la fin du cycle de fonctionnement du dispositif, c'est-à-dire pratiquement seulement lorsque l'ouverture de la vanne 17 est commandée pour compléter la trémie secondaire.It will also be noted that, if the consumption of prowder is to be taken into account in the conduct of the casting process, the closing time will preferably be short, in order to have the shortest possible reaction time on the process, being indeed understood that the consumption at a given instant can only be evaluated at the end of the device operating cycle, that is to say practically only when the opening of the valve 17 is controlled to complete the secondary hopper.

Dans la seconde variante, le dispositif comporte en plus un détecteur 23 de présence de poudre, placé sur la trémie secondaire ou sur le conduit d'alimentation, et également relié à l'armoire de contrôle 19. Dans ce cas l'ouverture de la vanne 17 est commandée lorsque le détecteur de présence 23 signale une absence de poudre.In the second variant, the device further comprises a detector 23 of the presence of powder, placed on the secondary hopper or on the supply duct, and also connected to the control cabinet 19. In this case the opening of the valve 17 is controlled when the presence detector 23 signals an absence of powder.

Le dispositif fonctionne alors de la manière suivante, à partir de la phase représentée sur le dessin.The device then operates in the following manner, starting from the phase shown in the drawing.

Par consommation dans la lingotière, le niveau de poudre dans la trémie secondaire baisse jusqu'à arriver à hauteur du détecteur de présence 23, qui envoie alors à l'armoire de contrôle 19 un signal d'absence de poudre, qui provoque à son tour l'ouverture de la vanne 17. La poudre remplit alors la trémie secondaire 18 jusqu'au niveau de l'extrémité inférieure de la tuyauterie 15, bloquant le débit dans cette tuyauterie. Le détecteur de débit 16 réagit alors et commande la fermeture de la vanne.By consumption in the ingot mold, the powder level in the secondary hopper drops until reaching the presence detector 23, which then sends to the control cabinet 19 a signal of absence of powder, which in turn causes the opening of the valve 17. The powder then fills the secondary hopper 18 up to the level of the lower end of the pipe 15, blocking the flow in this pipe. The flow detector 16 then reacts and controls the closing of the valve.

Autrement dit dans ce type de fonctionnement, la quantité de poudre consommée à chaque cycle est sensiblement constante, puisque correspondant au volume de la trémie 18 et des tuyauteries, entre le détecteur de présence 23 et la vanne 17, à la quantité près de poudre consommée entre le moment de la détection d'absence par le détecteur 23 et la fin du remplissage de la trémie secondaire. Par contre la durée entre deux ouvertures ou fermetures successives de la vanne, varie en fonction de la consommation en lingotière.In other words in this type of operation, the quantity of powder consumed in each cycle is substantially constant, since corresponding to the volume of the hopper 18 and of the pipes, between the presence detector 23 and the valve 17, to the quantity close to the powder consumed between the moment of absence detection by the detector 23 and the end of filling of the secondary hopper. On the other hand, the time between two successive openings or closings of the valve varies according to the consumption in the mold.

Par ailleurs, le détecteur de présence 23 sera placé suffisamment loin en amont de l'extrémité 11 du conduit 10, pour éviter en cas de consommation importante, une rupture d'alimentation de poudre dans la lingotière, qui pourrait être due à un éventuel retard dans l'écoulement de poudre entre la détection d'absence et l'arrivée de poudre dans ce conduit.Furthermore, the presence detector 23 will be placed far enough upstream of the end 11 of the conduit 10, to avoid, in the event of significant consumption, a break in the supply of powder to the ingot mold, which could be due to a possible delay. in the powder flow between the absence detection and the arrival of powder in this conduit.

On remarquera que, en cas de faible consommation et pour des capacités de trémie secondaire équivalente, dans la première variante la durée de chaque cycle pourra être courte et l'on aura très rapidement une valeur de la consommation, alors que dans la seconde variante la durée du cycle sera longue. On choisira donc préférentiellement dans ce cas une trémie secondaire de faible capacité pour réduire ce temps.It will be noted that, in the event of low consumption and for equivalent secondary hopper capacities, in the first variant the duration of each cycle may be short and a consumption value will very quickly be obtained, whereas in the second variant the cycle time will be long. In this case, therefore, a secondary hopper of low capacity will preferably be chosen to reduce this time.

On notera encore que dans les deux cas, une défaillance du système de contrôle ou de commande de la vanne 17 pourra être paliée sans autre préjudice pour la coulée, quant au maintien de la couche de poudre souhaitée en lingotière, que le manque de mesure de consommation, en commandant par exemple manuellement l'ouverture de la vanne 17 et en maintenant cette vanne ouverte. En effet la régulation de niveau de poudre dans la trémie secondaire 18 étant automatiquement réalisée de manière similaire à la régulation de niveau de poudre en lingotière, l'alimentation en poudre se poursuivra en continu, sans risque de débordement de la trémie secondaire.It will also be noted that in both cases, a failure of the control or command system of the valve 17 can be remedied without any other prejudice for the casting, as for maintaining the desired layer of powder in the mold, than the lack of measurement of consumption, for example by manually controlling the opening of the valve 17 and keeping this valve open. In fact, the regulation of the powder level in the secondary hopper 18 is automatically carried out in a similar manner to the regulation of the powder level in the ingot mold, the powder supply will continue continuously, without risk of overflow of the secondary hopper.

Dans la seconde variante, le détecteur de présence 23 pourrait également être placé directement sur la trémie 18 sans que le principe de fonctionnement du dispositif n'en soit modifié.In the second variant, the presence detector 23 could also be placed directly on the hopper 18 without the principle of operation of the device being modified.

La trémie secondaire 18 peut également être constituée par l'extrémité supérieure du conduit d'alimentation, qui sera alors suffisamment évasée pour y permettre la pénétration de l'extrémité inférieure de la tuyauterie 15.The secondary hopper 18 can also be constituted by the upper end of the supply duct, which will then be sufficiently flared to allow penetration of the lower end of the piping 15.

Claims (8)

1) Dispositif d'alimentation pour le dépôt sur la surface d'un métal liquide (2) contenu dans une lingotière (1) de coulée continue, d'une couche (3) d'un matériau poudreux ou granulé, comprenant un conduit d'alimentation (10) dont une extrémité inférieure (11) de décharge ouverte en permanence est située au-dessus de ladite surface du métal à une hauteur égale ou légèrement supérieure à une épaisseur de consigne de la couche dudit matériau, et des moyens d'alimentation permanente dudit matériau dans ledit conduit, caractérisé en ce qu'il comporte une trémie principale supérieure (13) pourvue d'une tuyauterie de vidange (15) dont l'extrémité inférieure pénètre sans y être rigidement liée dans une trémie secondaire inférieure (18), débouchant dans le conduit d'alimentation, une vanne d'obturation (17) et un détecteur de débit (16) du matériau, placés sur la tuyauterie de vidange, des moyens (19) de commande de la vanne en fonction des indications fournies par le détecteur de débit, des moyens de pesée (14) de la trémie supérieure, des moyens de calcul pour déterminer le débit du matériau en fonction du temps entre deux fermetures ou ouvertures successives de ladite vanne, et de la quantité de matériau s'écoulant de la trémie supérieure dans la trémie inférieure. 1) Feeding device for depositing on the surface of a liquid metal (2) contained in a mold (1) for continuous casting, a layer (3) of a powdery or granulated material, comprising a conduit d feed (10) of which a lower end (11) of permanently open discharge is situated above said surface of the metal at a height equal to or slightly greater than a target thickness of the layer of said material, and means for permanent supply of said material into said conduit, characterized in that it comprises an upper main hopper (13) provided with a drain pipe (15) whose lower end penetrates without being rigidly connected to it in a lower secondary hopper (18 ), opening into the supply duct, a shut-off valve (17) and a material flow detector (16), placed on the drain pipe, means (19) for controlling the valve according to the indications supplied by the flow detector, weighing means (14) of the upper hopper, calculation means for determining the flow of the material as a function of the time between two successive closings or openings of said valve, and of the quantity of material s '' flowing from the upper hopper into the lower hopper. 2) Dispositif selon la revendication 1, caractérisé en ce que la fermeture de la vanne (17) est commandée lorsque le détecteur de débit (16) indique un débit nul. 2) Device according to claim 1, characterized in that the closing of the valve (17) is controlled when the flow detector (16) indicates a zero flow. 3) Dispositif selon la revendication 1, caractérisé en ce qu'il comporte des moyens pour commander l'ouverture de la vanne au bout d'une période prédéterminée à compter de sa fermeture. 3) Device according to claim 1, characterized in that it comprises means for controlling the opening of the valve after a predetermined period from its closure. 4) Dispositif selon la revendication 1, caractérisé en ce qu'il comporte un détecteur (23) de présence du matériau placé sur la trémie inférieure ou sur le conduit d'alimentation à une distance prédéterminée en dessous de l'extrémité inférieure de la tuyauterie de vidange, et des moyens pour commander l'ouverture de la vanne lorsque ledit détecteur de présence indique une absence du matériau. 4) Device according to claim 1, characterized in that it comprises a detector (23) of presence of the material placed on the lower hopper or on the supply conduit at a predetermined distance below the lower end of the piping drain, and means for controlling the opening of the valve when said presence detector indicates an absence of the material. 5) Dispositif, selon la revendication 1, caractérisé en ce que la trémie inférieure est constituée par l'extrémité supérieure du conduit d'alimentation. 5) Device according to claim 1, characterized in that the lower hopper is constituted by the upper end of the supply duct. 6) Procédé d'alimentation et de dépôt, sur la surface d'un métal liquide contenu dans une lingotière de coulée continue, et au cours de la coulée, d'une couche d'un matériau poudreux ou granulé, caractérisé en ce qu'on utilise le dispositif selon la revendication 1, on positionne l'extrémité inférieur du conduit d'alimentation au-dessus de la surface du métal à une hauteur égale ou légèrement supérieure à une épaisseur de consigne de la couche dudit matériau, on emplit la trémie supérieure avec ledit matériau, et, dans le but de mesurer en permanence la consommation dudit matériau lors de la coulée dudit métal, on commande la fermeture de la vanne à chaque fois que le détecteur de débit indique un débit nul, on enregistre le temps t à chaque fermeture ou ouverture, et après chaque fermeture de la vanne, on effectue la pesée de la trémie supérieure et on enregistre la valeur mesurée, et on en déduit la consommation de matériau pendant chaque intervalle de temps entre deux fermetures successives de la vanne. 6) Method of feeding and depositing, on the surface of a liquid metal contained in a continuous casting mold, and during casting, a layer of a powdery or granulated material, characterized in that we use the device according to claim 1, the lower end of the supply duct is positioned above the surface of the metal at a height equal to or slightly greater than a target thickness of the layer of said material, the upper hopper is filled with said material, and , with the aim of permanently measuring the consumption of said material during the casting of said metal, the valve is closed when each flow detector indicates a zero flow, the time t is recorded at each closing or opening, and after each closure of the valve, the upper hopper is weighed and the measured value is recorded, and the material consumption is deduced therefrom during each time interval between two successive closings of the valve. 7) Procédé selon la revendication 6, utilisant le dispositif selon la revendication 3, caractérisé en ce qu'on commande l'ouverture de la vanne au bout d'une période déterminée, à compter de sa fermeture. 7) Method according to claim 6, using the device according to claim 3, characterized in that one controls the opening of the valve after a determined period, from its closing. 8) Procédé selon la revendication 6, utilisant le dispositif selon la revendication 4, caractérisé en ce qu'on commmande l'ouverture de la vanne lorsque le détecteur de présence indique l'absence de matériau. 8) Method according to claim 6, using the device according to claim 4, characterized in that the opening of the valve is controlled when the presence detector indicates the absence of material.
EP91470022A 1990-08-27 1991-08-16 Method and device for feeding a powder or granular material into a continuous casting mold Expired - Lifetime EP0473521B1 (en)

Priority Applications (1)

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AT91470022T ATE100005T1 (en) 1990-08-27 1991-08-16 METHOD AND APPARATUS FOR FEEDING POWDERY OR GRANULAR MATERIAL INTO A CONTINUOUS CASTING MOLD.

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FR9010756A FR2666035A1 (en) 1990-08-27 1990-08-27 METHOD AND DEVICE FOR SUPPLYING A POWDERED OR GRANULATED MATERIAL IN A CONTINUOUS CASTING LINGOTIERE.
FR9010756 1990-08-27

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CN107470591A (en) * 2017-08-07 2017-12-15 攀钢集团研究院有限公司 For molding the adding apparatus and its Adding Way of auxiliary material

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KR100466175B1 (en) * 2000-12-26 2005-01-13 주식회사 포스코 Automatic feeder of mold flux in continuous caster
KR100775090B1 (en) * 2006-08-07 2007-11-08 주식회사 포스코 Apparatus for suppling mold flux
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CN105057615A (en) * 2015-07-30 2015-11-18 江苏永钢集团有限公司 Crystallizer mold flux adding device
CN105057615B (en) * 2015-07-30 2017-04-12 江苏永钢集团有限公司 Crystallizer mold flux adding device
CN107470591A (en) * 2017-08-07 2017-12-15 攀钢集团研究院有限公司 For molding the adding apparatus and its Adding Way of auxiliary material

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AU8273991A (en) 1992-03-05
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FR2666035B1 (en) 1994-12-16
BR9103667A (en) 1992-05-19
US5158129A (en) 1992-10-27
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AU646685B2 (en) 1994-03-03
ES2050045T3 (en) 1994-05-01
ZA916737B (en) 1993-04-28
DK0473521T3 (en) 1994-05-16
EP0473521B1 (en) 1994-01-12

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