EP0022739A1 - Process and apparatus for measuring the slag level in a metallurgical vessel and for assessing its physical condition - Google Patents

Process and apparatus for measuring the slag level in a metallurgical vessel and for assessing its physical condition Download PDF

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EP0022739A1
EP0022739A1 EP80630021A EP80630021A EP0022739A1 EP 0022739 A1 EP0022739 A1 EP 0022739A1 EP 80630021 A EP80630021 A EP 80630021A EP 80630021 A EP80630021 A EP 80630021A EP 0022739 A1 EP0022739 A1 EP 0022739A1
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crucible
level
slag
pressure
carcass
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German (de)
French (fr)
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EP0022739B1 (en
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Jean Baumert
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Arcelor Luxembourg SA
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Arbed SA
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4673—Measuring and sampling devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

A method of and an apparatus for determining the level of slag above a metallurgical melt, especially a steel melt, and for determining a physical characteristic or property of the slag, such as its viscosity or consistency, utilizes a plurality of nozzles opening into the bath-containing vessel at different levels above the melt and supplied with inert gas. The difference in hydrostatic pressures at the nozzles can be ascertained by measurement of the pressures upstream thereof and the measured values are converted into indications of slag level and consistency.

Description

La présente invention concerne un procédé et un dispositif pour la mesure du niveau et pour l'appréciation de l'état physique de la scorie dans un récipient métallurgique, notamment dans un convertisseur d'aciérie.The present invention relates to a method and a device for measuring the level and for assessing the physical state of the slag in a metallurgical vessel, in particular in a steelworks converter.

La connaissance du niveau de la scorie dans un convertisseur d' aciérie est importante, tant du point de vue métallurgique, comme paramètre du degré d'avancement de l'affinage, que du point de vue de la sécurité, en vue de prévenir un débordement.Knowledge of the level of slag in a steel mill converter is important, both from a metallurgical point of view, as a parameter of the degree of refining progress, and from a safety point of view, in order to prevent overflow. .

Ainsi le déposant a développé un système de mesure du niveau de la scorie qui permet en même temps une évaluation de la consistance de celle-ci, ce qui constitue une information importante, surtout pour l'affinage de fontes phosphoreuses où une scorie d'une consistance mousseuse était jugée désirable.Thus the applicant has developed a system for measuring the level of the slag which allows at the same time an evaluation of the consistency thereof, which constitutes important information, especially for the refining of phosphorous cast irons where a slag of a frothy consistency was considered desirable.

Ce système de mesure que le déposant a décrit dans le brevet luxembourgeois no. 71.261, comporte un conduit acoustique ther- mostatisé qui est disposé au-dessus du convertisseur et qui capte le bruit émis par la lance de soufflage d'oxygène. Après filtrage des fréquences dont l'origine est étrangère aux paramètres qui intéressent pour la mesure proprement dite, on retient un signal dont l'interprétation permet de conclure au degré du bruit absorbé par la scorie et par là au degré du caractère mousseux présent ainsi qu'à son niveau dans le creuset.This measurement system that the applicant described in the Luxembourg patent no. 71.261, has a thermostatic acoustic conduit which is placed above the converter and which picks up the noise emitted by the oxygen blowing lance. After filtering the frequencies whose origin is foreign to the parameters of interest for the measurement proper, we retain a signal whose interpretation allows us to conclude that degree of the noise absorbed by the slag and thereby the degree of the sparkling character present as well as its level in the crucible.

Le développement de procédés d'affinage plus élaborés, comme celui décrit dans la demande de brevet luxembourgeois no. 81.207 du 30 avril 1979, qui comporte en plus du soufflage d'oxygène sur la surface du bain un barbotage du bain au moyen de gaz inerte introduit par le fond du creuset, résulte en la formation d'une scorie de consistance essentiellement non-mousseuse, ce qui apporte des avantages considérables, notamment en ce qui concerne le taux de post-combustion du CO au-dessus du bain. Par suite de l'absence d'une scorie mousseuse le système de mesure décrit plus haut n'est plus apte à fournir des résultats facilement interprétables pour déterminer le niveau de la scorie dans le creuset.The development of more sophisticated ripening processes, such as that described in the Luxembourg patent application no. 81.207 of April 30, 1979, which in addition to blowing oxygen on the surface of the bath, bubbling the bath by means of inert gas introduced through the bottom of the crucible, results in the formation of a slag of essentially non-foaming consistency , which brings considerable advantages, in particular with regard to the post-combustion rate of CO above the bath. Due to the absence of a frothy slag, the measurement system described above is no longer able to provide easily interpretable results for determining the level of slag in the crucible.

La présence d'une scorie plus dense, due à l'effet du barbotage de gaz inerte introduit par le fond du creuset, exige par conséquent l'élaboration d'un système de mesure basé sur des paramètres de mesure autres que le degré d'absorption du bruit émis par la lance de soufflage.The presence of a denser slag, due to the effect of the bubbling of inert gas introduced by the bottom of the crucible, therefore requires the development of a measurement system based on measurement parameters other than the degree of absorption of the noise emitted by the blowing lance.

Le but de l'invention consistait donc à proposer un système de mesure du niveau de la scorie et de son état physique, ce système de mesure étant largement indépendant du degré de moussage de la scorie et ses performances étant du moins équivalentes à celles des systèmes connus.The object of the invention therefore consisted in proposing a system for measuring the level of the slag and its physical state, this measurement system being largely independent of the degree of foaming of the slag and its performance being at least equivalent to that of the systems. known.

Ce but est pleinement atteint par le procédé de mesure suivant l'invention qui est caractérisé en ce que l'on prévoit à différents niveaux au-dessus du niveau de remplissage du creuset au moins deux prises de la pression hydrostatique, balayées par des jets de gaz inerte à débit réglable, que l'on ajuste les pressions des dites prises à des valeurs égales entre elles, que l'on capte ensuite les pressions existant aux dites prises et que l'on détermine le niveau de la scorie dans le creuset en interprétant les déviations des pressions mesurées par rapport à leurs valeurs initiales.This object is fully achieved by the measuring method according to the invention which is characterized in that at different levels above the filling level of the crucible there are at least two hydrostatic pressure intakes, swept by jets of inert gas with adjustable flow rate, that the pressures of said intakes are adjusted to equal values with each other, that the pressures existing at said intakes are then captured and that the level of slag is determined in the crucible by interpreting the deviations of the measured pressures compared to their initial values.

Le balayage des prises au moyen du gaz inerte, qui est de préférence de l'azote, assure que l'embouchure à la face intérieure du réfractaire dans lequel sont logées les prises de pression, soit toujours dégagée et le moins possible affectée par d'éventuelles éclaboussures.The scanning of the intakes by means of the inert gas, which is preferably nitrogen, ensures that the mouth on the inner face of the refractory in which the pressure intakes are housed, is always free and as little as possible affected by possible splashes.

L'idée qui est à la base de l'invention consiste donc à mesurer et à interpréter les différences de la pression hydrostatique déterminées à plusieurs niveaux bien définis au-dessus du niveau du bain dans le creuset.The idea which is the basis of the invention therefore consists in measuring and interpreting the differences in hydrostatic pressure determined at several well defined levels above the level of the bath in the crucible.

Le principe de fonctionnement du procédé est le suivant: On considère p.ex. 3 prises de pression, dont 2 (Al et A2) se trouvent à un même niveau et la 3e (B) est placé à un niveau plus élevé, la différence des niveaux étant égale à H. Les trois prises sont balayées par des débits d'azote tels que les pressions PA1' PA2 et PB soient égales si les prises débouchent librement dans la cavité du creuset, en d'autres termes, en l'absence de scorie. Cette situation se présente entre les phases d'élaboration et on en profite pour aligner les trois pressions à la même valeur avant le début de soufflage.The operating principle of the process is as follows: Consider, for example, 3 pressure taps, of which 2 (A l and A 2 ) are at the same level and the 3rd (B) is placed at a higher level, the difference in levels being equal to H. The three intakes are swept by nitrogen flow rates such that the pressures P A1 ' PA2 and P B are equal if the intakes freely open into the crucible cavity, in other words, in the absence of slag. This situation occurs between the development phases and we take advantage of this to align the three pressures to the same value before the start of blowing.

La prise A1 est choisie comme prise de référence. Son débit d'azote ajusté détermine la valeur de départ de la pression PA1. On annule ensuite les différences PAl - PA2 resp. PA1 PB.The socket A 1 is chosen as the reference socket. Its adjusted nitrogen flow determines the starting value of the pressure P A1 . We then cancel the differences PAl - PA2 resp. P A1 P B.

A partir du moment où le niveau de la scorie monte au-dessus du niveau A, les valeurs des pressions PA1 et PA2 augmentent à leur tour d'un montant x h, où α est le poids spécifique instantané de la scorie et h est la hauteur dont la niveau de la scorie dépasse le niveau A.From the moment the level of the slag rises above the level A, the values of the pressures P A1 and PA2 increase in their turn by an amount xh, where α is the instantaneous specific weight of the slag and h is the height whose slag level exceeds level A.

Si la scorie monte au-delà du niveau B, la pression PB s'écarte à son tour de sa valeur initiale.If the slag rises above level B, the pressure P B differs te in turn of its initial value.

En principe la différence des indications PA1 ou PA2 et PB étant égale à α H, permet de calculera, puisque H est connu.In principle, the difference in the indications P A1 or P A2 and P B being equal to α H, allows calculation, since H is known.

La différence entre l'indication momentanée de PA et sa valeur initiale permet de calculer le niveau absolu de la scorie à partir du moment où celle-ci est supérieure.à B.The difference between the momentary indication of P A and its initial value makes it possible to calculate the absolute level of the slag from the moment it is greater than B.

Dans le but de disposer d'un moyen de contrôle et d'une sécurité supplémentaire on a donc prévu au même niveau A deux prises, qui, en principe, fournissent à tout moment des résultats identiques.En d'autres termes, elles permettent une appréciation relative de leur comportement. Si après quelques campagnes on constate que le comportement des 2 prises est satisfaisant, c.à.d. fiable et reproductible, on peut supprimer l'une des prises au niveau A, ainsi que l'appareillage y associé.In order to have additional control and security, two sockets are therefore provided at the same level, which, in principle, provide identical results at all times. In other words, they allow relative appreciation of their behavior. If after a few campaigns it is found that the behavior of the 2 catches is satisfactory, i.e. reliable and reproducible, you can remove one of the sockets at level A, as well as the associated equipment.

Le dispositif nécessaire à la mise en oeuvre du procédé suivant l'invention comprend au moins deux capteurs individuels, qui sont encastrés à deux niveaux différents dans la paroi verticale d'un creuset. Chaque capteur comprend un tube rigide de prise de pression logé dans le réfractaire du creuset lequel tube est rattaché à un tube souple qui traverse la carcasse du creuset et établit la communication avec un instrument conventionnel de mesure de la pression.The device necessary for implementing the method according to the invention comprises at least two individual sensors, which are embedded at two different levels in the vertical wall of a crucible. Each sensor comprises a rigid pressure tapping tube housed in the crucible refractory which tube is attached to a flexible tube which crosses the crucible carcass and establishes communication with a conventional pressure measurement instrument.

Suivant l'invention il suffit de munir la carcasse du creuset, ainsi que le réfractaire de perforations suffisantes pour livrer un passage aux tubes rigides resp. souples et de prévoir dans le garnissage, entre la carcasse et le réfractaire, une chambre que traverse le tube souple et de plier ce dernier en U à l'intérieur de ladite chambre.According to the invention, it suffices to provide the carcass of the crucible, as well as the refractory with sufficient perforations to deliver passage to the rigid tubes resp. flexible and to provide in the lining, between the carcass and the refractory, a chamber through which the flexible tube and to bend the latter in a U inside said chamber.

De ce fait la possibilité d'un déplacement relatif entre le réfractaire et la carcasse est donnée sans danger de cisaillement du tube de prise de pression.Therefore the possibility of a relative displacement between the refractory and the carcass is given without danger of shears pressure tapping tube.

D'autres avantages et caractéristiques ressortiront de la description des dessins. Dans ces dessins la fig. 1 représente de manière non-limitative le schéma d'une forme d'exécution préférée d'un capteur de pression suivant l'invention, tandis que la fig. 2 montre un schéma de principe d'une forme d'exécution possible de l'ensemble de mesure.Other advantages and characteristics will emerge from the description of the drawings. In these drawings fig. 1 shows in a nonlimiting manner the diagram of a preferred embodiment of a pressure sensor according to the invention, while FIG. 2 shows a block diagram of a possible embodiment of the measuring assembly.

En fig. 1 on distingue la brique de prise de pression (1), qui peut avoir la taille des briques réfractaires voisines normales et qui contient la prise de pression. Cette prise est constituée par un tube en un matériau réfractaire (11), de préférence céramique, qui conserve sa forme, c.à.d. sa section de passage pour le gaz de balayage, aux températures élevées.In fig. 1 we distinguish the pressure tap brick (1), which can be the size of normal neighboring refractory bricks and which contains the pressure tap. This socket is constituted by a tube made of a refractory material (11), preferably ceramic, which retains its shape, i.e. its passage section for the purging gas, at high temperatures.

Le tube (11) est logé dans un tube métallique (12) le protégeant à l'égard des efforts mécaniques surgissant surtout lors de la cuisson du convertisseur et en début de campagne jusqu'au moment où la cuisson peut être considérée comme terminée. La combinaison des deux tubes, qui s'usent parallèlement avec le réfractaire, doit assurer une perte de charge -due au gaz de balayage- stable et reproductible durant toute la campagne du creuset.The tube (11) is housed in a metal tube (12) protecting it with regard to mechanical forces arising especially during the cooking of the converter and at the start of the campaign until the cooking can be considered as finished. The combination of the two tubes, which wear in parallel with the refractory, must ensure a pressure drop - due to the sweeping gas - stable and reproducible during the whole crucible campaign.

A l'extrémité "froide" de la prise de pression est fixé un tube souple (13) p.ex. en cuivre qui est plié en U, afin de rattraper un déplacement relatif éventuel entre le réfractaire et la carcasse (5) du creuset.At the "cold" end of the pressure tap is fixed a flexible tube (13) eg of copper which is bent in a U, in order to make up for any relative displacement between the refractory and the carcass (5) of the crucible .

Du côté du garnissage permanent (30) la brique de prise de pression est logée dans un matelas en fibres réfractaires qui a pour but d'atténuer les efforts de cisaillement auxquels elle risque d'être exposée au niveau de la face séparant les deux couches de réfractaires.On the side of the permanent lining (30), the pressure tapping brick is housed in a mattress of refractory fibers which aims to attenuate the shear forces to which it risks being exposed at the level of the face separating the two layers of refractory.

La brique de prise de pression (1) y compris les tubes (11), (12) et (13) sont des éléments d'usure qui sont remplacés lors de chaque maçonnage du creuset. Le travail à exécuter lors de chaque remplacement est d'enlever le bouchon (21), d'insérer le tube (13), de remettre le bouchon (21), de serrer le bourrage (22) afin de rendre la prise étanche vis-à-vis de la carcasse.The pressure tap brick (1) including the tubes (11), (12) and (13) are wear elements which are replaced each time the crucible is built. The work to be carried out during each replacement is to remove the plug (21), to insert the tube (13), to replace the plug (21), to tighten the packing (22) in order to make the plug watertight vis- opposite the carcass.

La transmission de la pression vers l'instrument de mesure se fait par un tube (41) d'un diamètre suffisamment grand pour qu'il n'y ait pas de perte de charge appréciable due à l'écoulement du fluide de balayage, en l'occurrence de l' azote.The pressure is transmitted to the measuring instrument by a tube (41) with a sufficiently large diameter so that there is no appreciable pressure drop due to the flow of the sweeping fluid, in particular the occurrence of nitrogen.

En fig. 2 on distingue les 3 prises de pression Al, A2 et B. Ces prises sont utilement disposées en-dessous du tourillon du creuset. Les prises Al et A2 se trouvent au même niveau au-dessus de la ligne de remplissage du creuset, tandis que la prise B est placée à une certaine distance au-dessus des prises Al et A2, la différence entre les niveaux des prises étant égale à H.In fig. 2 a distinction is made between the 3 pressure taps A1, A2 and B. These taps are usefully arranged below the crucible journal. The plugs A1 and A2 are at the same level above the filling line of the crucible, while the plug B is placed at a certain distance above the plugs Al and A2, the difference between the levels of the plugs being equal to H.

Les trois prises sont balayées par des débits d'azote tels que les pressions PA1 PA2 et P sont égales si les prises débouchent librement dans la cavité du creuset, ce qui est le cas en l'absence de scorie. On ajuste donc les trois pressions à la même valeur avant le début de soufflage et/ou entre les phases de soufflage.The three intakes are swept by nitrogen flow rates such that the pressures P A1 PA2 and P are equal if the intakes freely open into the crucible cavity, which is the case in the absence of slag. The three pressures are therefore adjusted to the same value before the start of blowing and / or between the blowing phases.

La prise (A.) est choisie comme prise de référence. Le débit d'azote (N2) est ajusté manuellement à l'aide d'un détendeur (D). Ce débit détermine la valeur de départ de la pression (PA1). Deux régulateurs (R) annulent les différences PA1-PA2 resp. PAl - P B par action sur les vannes (VA2) et (VB). Cet alignement accompli -opération qui prend quelques secondes- les entrées des régulateurs (R) sont court-circuitées ce qui a pour effet de figer les vannes de réglage dans leur dernière position p.ex. par l'intermédiaire de régulateurs de position. En casde vannes de réglage commandées par un moteur électrique, il suffit de couper la sortie des régulateurs (R) afin de bloquer les vannes dans leur dernière position.The outlet (A.) Is selected as reference point. The nitrogen flow (N2) is adjusted manually using a pressure reducer (D). This flow rate determines the starting value of the pressure (P A1 ). Two regulators (R) cancel the differences P A1 -PA2 re s p. P Al - P B by action on the valves (VA2) and (V B ). This alignment accomplished - operation which takes a few seconds - the regulator inputs (R) are short-circuited which has the effect of freezing the control valves in their last position eg by means of regulators position. In the case of control valves controlled by an electric motor, it is sufficient to cut off the output of the regulators (R) in order to block the valves in their last position.

On distingue également les manomètres ou convertisseurs de pression (QA1, QA2 et QB) qui, combinés aux tuyères à détente critique (TA1, TA2 et TB) remplacent avantageusement les débitmètres onéreux.There are also pressure gauges or pressure converters (QA1, QA2 and QB) which, combined with critical expansion nozzles (TA1, TA2 and TB) advantageously replace expensive flowmeters.

L'acquisition des données A peut être centralisée en un calculateur qui se charge de la transformation des résultats de mesure en informations significatives pour le personnel de l'aciérie ou en un ordinateur qui assume la conduite de l'élaboration de l'acier.The acquisition of A data can be centralized in a computer which is responsible for the transformation of the measurement results into meaningful information for the staff of the steelworks or in a computer which assumes the control of the steel making.

Claims (11)

1. Procédé pour la mesure du niveau et pour l'appréciation de l'état physique de la scorie dans un récipient métallurgique, notamment dans un convertisseur d'aciérie, caractérisé en ce que l'on prévoit à différents niveaux au-dessus du niveau de remplissage du creuset au moins deux prises de la pression hydrostatique, balayées par des jets de gaz inerte à débit réglable, que l'on ajuste les pressions des dites prises à des valeurs égales entre elles, que l'on capte ensuite les pressions existant aux dites prises et que l'on détermine le niveau de la scorie dans le creuset en interprétant les déviations des pressions mesurées par rapport à leurs valeurs initiales.1. Method for measuring the level and for assessing the physical state of the slag in a metallurgical vessel, in particular in a steelworks converter, characterized in that provision is made at different levels above the level filling the crucible with at least two hydrostatic pressure intakes, swept by jets of inert gas with adjustable flow rate, that the pressures of said intakes are adjusted to equal values with each other, that the existing pressures are then captured to the said taps and that the level of the slag in the crucible is determined by interpreting the deviations of the pressures measured with respect to their initial values. 2. Procédé suivant la revendication 1, caractérisé en ce que l'on utilise de l'azote comme gaz inerte.2. Method according to claim 1, characterized in that nitrogen is used as inert gas. 3. Procédé suivant les revendications 1-2, caractérisé en ce que l'on prévoit trois prises de pression hydrostatique dont deux sont situées à un même niveau, tandis que la troisième est située à un niveau plus élevé de la paroi verticale du creuset.3. Method according to claims 1-2, characterized in that three hydrostatic pressure taps are provided, two of which are located at the same level, while the third is located at a higher level of the vertical wall of the crucible. 4. Procédé suivant les revendications 1-3, caractérisé en ce que l'on utilise l'une des deux prises de pression hydrostatique qui sont situées à un même niveau de la paroi verticale du creuset comme prise de référence vis-à-vis de la prise de pression hydrostatique située à un niveau plus élevé et que l'on utilise l'autre des deux prises comme prise de contrôle de la fiabilité de la mesure.4. Method according to claims 1-3, characterized in that one of the two hydrostatic pressure taps which are located at the same level of the vertical wall of the crucible is used as reference tap with respect to the hydrostatic pressure tap located at a higher level and that the other of the two taps is used as a check on the reliability of the measurement. 5. Dispositif pour la mise en oeuvre du procédé suivant les revendications 1-4, caractérisé en ce qu'il comprend au moins deux capteurs individuels, qui sont encastrés à deux niveaux différents dans la paroi verticale d'un creuset, chaque capteur comprenant un tube rigide de prise de pression qui est rattaché à un tube souple traversant la carcasse du creuset et établissant la communication avec un instrument conventionnel de mesure de la pression.5. Device for implementing the method according to claims 1-4, characterized in that it comprises at least two individual sensors, which are embedded at two different levels in the vertical wall of a crucible, each sensor comprising a rigid pressure test tube which is attached to a flexible tube crossing the carcass of the crucible and establishing communication with a conventional pressure measurement instrument. 6. Dispositif suivant la revendication 5, caractérisé en ce que l'on prévoit dans le réfractaire et dans la carcasse du creuset des perforations suffisantes pour livrer un passage aux tubes rigides resp. souples et que l'on prévoit dans le garnissage, entre la carcasse et le réfractaire, une chambre que traverse librement le tube souple qui est plié en U à l' intérieur de ladite chambre.6. Device according to claim 5, characterized in that there is provided in the refractory and in the carcass of the crucible sufficient perforations to deliver a passage to the rigid tubes resp. flexible and that is provided in the lining, between the carcass and the refractory, a chamber which freely crosses the flexible tube which is bent in a U inside said chamber. 7. Dispositif suivant les revendications 5-6, caractérisé en ce que le tube rigide est constitué d'un tube extérieur en métal réfractaire et d'un tube concentrique intérieur en un matériau réfractaire.7. Device according to claims 5-6, characterized in that the rigid tube consists of an outer tube of refractory metal and an inner concentric tube of a refractory material. 8. Dispositif suivant les revendications 5-7, caractérisé en ce que à l'extérieur de la carcasse du creuset le tube souple passe par un bouchon perforé muni d'un bourrage et aboutit dans une chambre fixe, qui est reliée au moyen d'une conduite rigide à un instrument conventionnel de mesure de la pression.8. Device according to claims 5-7, characterized in that outside the carcass of the crucible the flexible tube passes through a perforated plug provided with a stuffing and ends in a fixed chamber, which is connected by means of a rigid pipe to a conventional pressure measuring instrument. 9. Dispositif suivant la revendication 8, caractérisé en ce que la conduite rigide présente un diamètre suffisamment élevé pour minimiser les pertes de charge dues à l'écoulement du fluide de balayage.9. Device according to claim 8, characterized in that the rigid pipe has a sufficiently large diameter to minimize the pressure losses due to the flow of the sweeping fluid. 10. Dispositif suivant les revendications 5-9, caractérisé en ce que les prises de pression hydrostatique sont disposées en-dessous du tourillon du creuset.10. Device according to claims 5-9, characterized in that the hydrostatic pressure taps are arranged below the trunnion of the crucible. 11. Dispositif suivant les revendications 5-10, caractérisé en ce que les instruments de mesure sont reliés à un processeur électronique qui se charge de l'interprétation des signaux de mesure et qui les convertit en signaux de commande.11. Device according to claims 5-10, characterized in that the measuring instruments are connected to an electronic processor which is responsible for interpreting the measurement signals and which converts them into control signals.
EP80630021A 1979-07-16 1980-07-02 Process and apparatus for measuring the slag level in a metallurgical vessel and for assessing its physical condition Expired EP0022739B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80630021T ATE756T1 (en) 1979-07-16 1980-07-02 METHOD AND DEVICE FOR MEASURING THE LEVEL OF SLAG IN A METALLURGICAL VESSEL AND EVALUATION OF ITS PHYSICAL CONDITION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU81512 1979-07-16
LU81512A LU81512A1 (en) 1979-07-16 1979-07-16 METHOD AND DEVICE FOR MEASURING THE LEVEL OF SLAG IN A METALLURGICAL CONTAINER AND FOR ASSESSING ITS PHYSICAL STATE

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EP0022739A1 true EP0022739A1 (en) 1981-01-21
EP0022739B1 EP0022739B1 (en) 1982-03-17

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EP80630021A Expired EP0022739B1 (en) 1979-07-16 1980-07-02 Process and apparatus for measuring the slag level in a metallurgical vessel and for assessing its physical condition

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US (1) US4359211A (en)
EP (1) EP0022739B1 (en)
JP (1) JPS5616614A (en)
AT (1) ATE756T1 (en)
AU (1) AU6041580A (en)
BR (1) BR8004359A (en)
CA (1) CA1159923A (en)
DE (1) DE3060230D1 (en)
ES (1) ES8103179A1 (en)
LU (1) LU81512A1 (en)
PT (1) PT71535A (en)
ZA (1) ZA804241B (en)

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US5289716A (en) * 1992-08-21 1994-03-01 The United States Of America As Represented By The United States Department Of Energy Monitoring and analyzing waste glass compositions
US5650117A (en) * 1995-09-27 1997-07-22 Vesuvius Crucible Company Slag detecting apparatus and method
US6130637A (en) * 1998-08-18 2000-10-10 Usx Corporation Measuring the thickness of hot slag in steelmaking
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Also Published As

Publication number Publication date
ZA804241B (en) 1981-07-29
AU6041580A (en) 1981-01-22
ES493399A0 (en) 1981-02-16
ATE756T1 (en) 1982-04-15
ES8103179A1 (en) 1981-02-16
PT71535A (en) 1980-08-01
US4359211A (en) 1982-11-16
BR8004359A (en) 1981-01-27
EP0022739B1 (en) 1982-03-17
JPS5616614A (en) 1981-02-17
LU81512A1 (en) 1981-02-03
DE3060230D1 (en) 1982-04-15
CA1159923A (en) 1984-01-03

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