EP1784611A1 - Deslagging door closure for electric arc furnace - Google Patents

Deslagging door closure for electric arc furnace

Info

Publication number
EP1784611A1
EP1784611A1 EP04769116A EP04769116A EP1784611A1 EP 1784611 A1 EP1784611 A1 EP 1784611A1 EP 04769116 A EP04769116 A EP 04769116A EP 04769116 A EP04769116 A EP 04769116A EP 1784611 A1 EP1784611 A1 EP 1784611A1
Authority
EP
European Patent Office
Prior art keywords
door
plug
oven
sealing
tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04769116A
Other languages
German (de)
French (fr)
Inventor
Jean Davene
Romain Viceriat
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.)
Civile Barbe-Davene Ste
Original Assignee
Civile Barbe-Davene Ste
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Civile Barbe-Davene Ste filed Critical Civile Barbe-Davene Ste
Publication of EP1784611A1 publication Critical patent/EP1784611A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/19—Arrangements of devices for discharging
    • 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
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material

Definitions

  • the object of the present invention is a cooled plug capable of rendering the scrubber door of a sealed arc furnace; it brings, among other benefits, energy savings and improvements in oven productivity.
  • the scrubber door of an arc furnace supplied with alternating current as with direct current is an orifice of more than one square meter located in the side wall of the furnace, also called tank top, closed by a sliding door operated pneumatically, hydraulically or electrically.
  • the main disadvantage of this scrubber door is that it is very difficult to have a correct seal and that it is too frequently kept open, in whole or in part, during the normal cycle of production.
  • the air inlets, amplified by the smoke collection system, produce thermal losses of up to 8% of the electrical energy consumption.
  • a secondary disadvantage of the scrubber door is that its design imposes a large door threshold inside the furnace, on which accumulates from 500 kg to 1 ton of scrap during the loading of the baskets and that these scrap, distant from the center of the oven, become all those loaded in the most difficult oven to melt.
  • the scrubber door is also installed in a rather cold area of the furnace and the melting of the scrap that is on the threshold of the slag door is further delayed.
  • - serves as a inspection door to inspect, from the outside, the state of refractory wear and interior walls of the furnace between two casting cycles.
  • the main function of the sludge door is the removal of the slag from the furnace crucible to the slag tank or the soil and the quantities to be discharged as the instantaneous flow rates do not require an opening of this size.
  • the slag can be discharged from the furnace by an orifice of a section close to a square decimetre and, in the case of foaming of this slag, the interior volume of the furnace easily contains the foaming slag as long as its specific gravity remains greater than 0.12 tonnes per cubic meter; for castings of 120 tons of liquid metal there are 12 tons of slag with an available volume of 100 cubic meters in the "upper part of the tank" or a specific mass of 0.12 tons per cubic meter to fill the entire space available; having a slag of lower specific gravity is very exceptional and in this case the reduction of the electrical power instantly limits the foaming of the slag.
  • the invention by effectively closing the hole of the door in the tank top, allows: - to reduce the surface of the opening in the oven tank; the door plug closes an orifice, either square or semicircular, of a fifth to a half square meter arranged in the top of the furnace tank in place of the conventional door;
  • the cap is applied by its upper face and its side faces to the top of the furnace tank whose reinforcements are arranged to match the shape of the cap; the bearing faces are lined with cast iron plate or graphite to ensure proper positioning of the door plug and thus a good seal in the closed position; the lower face of the cap is supported on the refractory lining of the door sill, the upholstery maintained by the operators in height and flatness;
  • the door plug preferably remains supported by its upper face on the corresponding wall of the top of the furnace tank, creating a rectangular and horizontal passage between the underside of the door plug and the slagging threshold for the slag discharge, while limiting the air intakes; to ensure that the closure of the passage through the stopper reaches the lower surface of the water-cooled panels of the top of the furnace tank; the threshold of the door is then reduced to a minimum and there is no more accumulation of scrap difficult to melt.
  • the invention relates to the establishment of a prismatic or frustoconical plug, male in a housing of female form which is identical and arranged in the top of the electric furnace tank.
  • This cap metallic, is cooled with water; this cooling is of similar design to that of water-cooled panels that fill the inside of the top of the furnace tank.
  • the inner face of the oven is optionally reinforced by pins welded therein to have a better grip of the slag, better resistance to shocks scrap and a low sensitivity to electrical priming.
  • a ceramic coating is envisaged as an alternative to the basic design.
  • This cap keeps a certain mobility on its support to be able to be put in place in its housing which is subject to deformations over time and whose position relative to the working floor depends on the inclination of the oven; indeed the oven is usually in a horizontal position but it can be tilted a few degrees, forwards or backwards, during part of the casting cycle, during which time the cap must ensure the sealing of the cleaning door.
  • the mobility of the plug is obtained thanks to an articulated connection with horizontal axis with:
  • the handling mechanism has adjustment means and position control which are links or boxes springs or hydraulic cylinders or any other equivalent mechanical means.
  • the door plug is removed by the handling mechanism that supports the plug and away from its normal working position.
  • the movement is either straight with a carriage that moves in the axis of the door, either rotating with a bracket placed on the fixed floor or the mobile floor of the oven.
  • the carriage easily assures precise positioning of the plug which then moves in a vertical plane.
  • a stem when the axis of rotation is vertical the plug moves in a horizontal plane when the axis of rotation is vertical; when the axis of rotation is inclined the movement takes place in an inclined plane or even curved to allow the immediate release of the threshold of the door by pivoting upwards.
  • the implementation of the cap and its removal are done by following the inclined upper part of its housing in the top of the tank to leave a space under the door plug, space through which the slag of the oven is removed, without have a full opening of the door.
  • the door cap In the closed position the door cap is equipped with two auxiliary means, - one for its holding in position on the top of the tank, a clamage for example, which releases the mechanism of maintaining the door cap of a permanent effort the other to exert a tearing force at its opening, such as a hydraulic cylinder for example, the slag that lines the inside of the oven exerting a possible retention of the door plug in the closed position.
  • two auxiliary means - one for its holding in position on the top of the tank, a clamage for example, which releases the mechanism of maintaining the door cap of a permanent effort the other to exert a tearing force at its opening, such as a hydraulic cylinder for example, the slag that lines the inside of the oven exerting a possible retention of the door plug in the closed position.
  • the door cap may comprise a passage opening of an injection lance or of a temperature measurement or sample taking lance, to the detriment of a less good seal.
  • the underside of the door plug consists of a piece of refractory material insensitive to contact with the metal in the event of inadvertent overflow thereof.
  • Such a door plug brings electrical and fossil energy savings, a better homogeneity of the melting of scrap in the furnace, a reduction of the capacity of collection of fumes and consequently an improvement of the productivity of the furnace.
  • Figure 1 shows a top view and in sectional elevation, the door cap object of this patent.
  • 2 shows, in plan view, a section of the part of the oven corresponding to the sludge door with the door plug in the "closed” position and a handle for handling the door plug.
  • Figure 3 shows elevational view of the same part of the tank with the door plug in the "closed” position.
  • the prismatic door plug 1 as shown in FIGS. 1, 2 and 3, is a metal assembly cooled by water by a steel tube 10 embedded in plates 11 to ensure good contact with the housing arranged in the upper part. 6.
  • the door plug 1 is supported and held in place by means of the uncooled support 2, driven by the support 3, two movements in the axis of the door, one vertical and the other horizontal thanks to the suspension rods 31 and 32 and a lateral movement evacuation of the assembly to a parking position by rotation of the arm 4.
  • the door cap 1 has a prismatic shape which fits the structure 6 of the top furnace tank, filled with cooled panels 61 and the door sill 5 made of refractories 62 which fill the structure 63 of the bottom of tank.
  • the underside of the door plug 1 may be in contact with the scrap charged to be melted.
  • the contact surfaces between the door plug 1 and the top of the tank 6 are contiguous in the planes 12, 13 and 14. These contact planes 12, 13 and 14 have a low coefficient of friction in order to facilitate the installation of the plug 1 in the top of tank 6.
  • the movements of the supports 2 and 3, controlled by the rods 31 and 32 are such that the upper surface of the door plug 1 comes first to rely on the surface 12 and then sliding on this surface is applied on the walls 13 and 14 and on the door sill 5.
  • the clamps 23 secured to the support 2 of the assembly of the door plug 1 hook the reinforcements 65 of the tank 6 to ensure the closed position of the door plug 1 during the production cycles of the electric oven.
  • the control of these damages, opening and closing, is made by 2 hydraulic cylinders 25 installed in the support 2 of the door plug 1.
  • the mechanism 26 makes it possible to pull back the door plug 1 after opening the clamage by means of the 2 hydraulic jacks 24.
  • the door plug 1 is then retracted by the support 3 and the jib 4: the scrubber door is then opened.

Abstract

The invention relates to a door closure device for an electric furnace, which is designed to seal same. The invention comprises a conical or prismatic metallic closure which is cooled with water and which is positioned in a same-shaped housing that is located at the top of the chamber of the electric furnace. The door closure, which is handled using an arm that is fixed to a rotary bar or a carriage, is applied against the four faces of the aforementioned housing and appears inside the furnace. The movements of the door closure can be controlled such that it can follow the upper part of the housing while leaving a space between the door closure and the door sill so as to enable deslagging.

Description

BOUCHON DE PORTE DE DECRASSAGE DE FOUR ELECTRIQUE A ARCS ARCS ELECTRIC OVEN DECRASSING DOOR PLUG
L'invention objet de la présente demande consiste en un bouchon refroidi capable de rendre la porte de décrassage d'un four à arcs étanche ; elle apporte, entre autres avantages, des économies d'énergie et des améliorations de la productivité du four.The object of the present invention is a cooled plug capable of rendering the scrubber door of a sealed arc furnace; it brings, among other benefits, energy savings and improvements in oven productivity.
La porte de décrassage d'un four à arcs alimenté en courant alternatif comme en courant continu est un orifice de plus d'un mètre carré situé dans la paroi latérale du four, aussi appelé haut de cuve, obturé par une porte coulissante actionnée pneumatiquement, hydrauliquement ou électriquement. Le principal inconvénient de cette porte de décrassage est qu'il est très difficile d'avoir une étanchéité correcte et qu'elle est trop fréquemment maintenue ouverte, en totalité ou en partie, au cours du cycle normal de production. Les entrées d'air, amplifiées par le système de captage des fumées, produisent des pertes thermiques pouvant atteindre 8% de la consommation d'énergie électrique.The scrubber door of an arc furnace supplied with alternating current as with direct current is an orifice of more than one square meter located in the side wall of the furnace, also called tank top, closed by a sliding door operated pneumatically, hydraulically or electrically. The main disadvantage of this scrubber door is that it is very difficult to have a correct seal and that it is too frequently kept open, in whole or in part, during the normal cycle of production. The air inlets, amplified by the smoke collection system, produce thermal losses of up to 8% of the electrical energy consumption.
Un inconvénient secondaire de la porte de décrassage est que sa conception impose un seuil de porte important à l'intérieur du four, sur lequel s'accumule de 500 kg à 1 tonne de ferrailles au cours du chargement des paniers et que ces ferrailles, éloignées du centre du four, deviennent de toutes celles chargées au four les plus difficile à fondre. Dans les fours à courant alternatif la porte de décrassage est de plus installée dans une zone plutôt froide du four et la fusion des ferrailles qui sont sur le seuil de la porte de décrassage est d'autant plus retardée.A secondary disadvantage of the scrubber door is that its design imposes a large door threshold inside the furnace, on which accumulates from 500 kg to 1 ton of scrap during the loading of the baskets and that these scrap, distant from the center of the oven, become all those loaded in the most difficult oven to melt. In AC furnaces the scrubber door is also installed in a rather cold area of the furnace and the melting of the scrap that is on the threshold of the slag door is further delayed.
Il est traditionnellement reconnu que la porte de décrassage : - est utile à l'évacuation du laitier du four, comme son nom l'indique,It is traditionally known that the slaughter door: - is useful for the removal of the slag from the oven, as the name suggests,
- est nécessaire à l'injection d'oxygène et de carbone dans le four par des lances, consommables ou non, pour accélérer la fusion des ferrailles et obtenir la décarburàtion du bain d'acier,- is necessary for the injection of oxygen and carbon into the furnace by lances, consumable or not, to accelerate the melting of scrap and obtain the decarburation of the steel bath,
- est utile pour introduire des matières secondaires dans le four par un dispositif du type chargeuse,is useful for introducing secondary materials into the furnace by a device of the loader type,
- sert de porte de visite pour inspecter, de l'extérieur, l'état d'usure des réfractaires et des parois intérieurs du four entre deux cycles de coulée.- serves as a inspection door to inspect, from the outside, the state of refractory wear and interior walls of the furnace between two casting cycles.
En fait, la porte de décrassage a pour fonction principale l'évacuation du laitier du creuset du four vers le cuvier à laitier ou le sol et les quantités à évacuer comme les débits instantanés ne nécessitent pas une ouverture de cette taille. Le laitier peut être évacué du four par un orifice de section voisine d'un décimètre carré et en cas de moussage de ce laitier le volume intérieur du four contient facilement le laitier moussant tant que sa masse spécifique reste supérieure à 0,12 tonne par mètre cube ; pour des coulées de 120 tonnes de métal liquide il y a 12 tonnes de laitier avec un volume disponible de 100 mètres cubes dans la partie « haut de cuve » soit une masse spécifique de 0,12 tonnes par mètre cube pour remplir tout l'espace disponible ; avoir un laitier de masse spécifique inférieure est très exceptionnel et dans ce cas la réduction de la puissance électrique limite instantanément le moussage du laitier.In fact, the main function of the sludge door is the removal of the slag from the furnace crucible to the slag tank or the soil and the quantities to be discharged as the instantaneous flow rates do not require an opening of this size. The slag can be discharged from the furnace by an orifice of a section close to a square decimetre and, in the case of foaming of this slag, the interior volume of the furnace easily contains the foaming slag as long as its specific gravity remains greater than 0.12 tonnes per cubic meter; for castings of 120 tons of liquid metal there are 12 tons of slag with an available volume of 100 cubic meters in the "upper part of the tank" or a specific mass of 0.12 tons per cubic meter to fill the entire space available; having a slag of lower specific gravity is very exceptional and in this case the reduction of the electrical power instantly limits the foaming of the slag.
Les autres fonctions traditionnelles assurées par la porte de décrassage comme l'introduction des lances d'injection d'oxygène et de carbone, l'introduction de matières secondaires par une chargeuse et l'observation des réfractaires peuvent être remplies par d'autres moyens ou d'autres méthodes, dont certaines sont actuellement en service industriel, qu'il n'est pas nécessaire de développer ici.Other traditional functions provided by the sludge door such as the introduction of oxygen and carbon injection lances, the introduction of secondary materials by a loader and the observation of refractories can be fulfilled by other means or other methods, some of which are currently in industrial service, which need not be developed here.
Pour palier aux inconvénients cités ci-dessus entraînés par l'existence de la porte de décrassage l'invention, en venant boucher de façon efficace le trou de la porte dans le haut de cuve, permet : - de réduire la surface de l'ouverture dans la cuve du four ; le bouchon de porte obture un orifice, soit carré soit semi-circulaire, de un cinquième à un demi mètre carré aménagé dans le haut de cuve du four en lieu et place de la porte conventionnelle;To overcome the drawbacks mentioned above caused by the existence of the slaughter door the invention, by effectively closing the hole of the door in the tank top, allows: - to reduce the surface of the opening in the oven tank; the door plug closes an orifice, either square or semicircular, of a fifth to a half square meter arranged in the top of the furnace tank in place of the conventional door;
- d'obturer ce trou de façon étanche ; le bouchon est appliqué par sa face supérieure et ses faces latérales au haut de cuve du four dont les renforts sont aménagés pour épousés la forme du bouchon ; les faces d'appui sont garnies de plaque de fonte ou de graphite pour assurer un bon positionnement du bouchon de porte et ainsi une bonne étanchéité en position fermée ; la face inférieure du bouchon s'appui sur le garnissage réftactaire du seuil de porte, garnissage entretenu par les opérateurs en hauteur et en planéité ;- To seal this hole tightly; the cap is applied by its upper face and its side faces to the top of the furnace tank whose reinforcements are arranged to match the shape of the cap; the bearing faces are lined with cast iron plate or graphite to ensure proper positioning of the door plug and thus a good seal in the closed position; the lower face of the cap is supported on the refractory lining of the door sill, the upholstery maintained by the operators in height and flatness;
- d'ouvrir partiellement le passage dans le haut de cuve entre l'intérieur du four et l'extérieur ; le bouchon de porte reste de préférence appuyé par sa face supérieure sur la paroi correspondante du haut de cuve du four, en créant un passage rectangulaire et horizontal entre la face inférieure du bouchon de porte et le seuil de décrassage pour l'évacuation du laitier, tout en limitant les entrées d'air ; de faire en sorte que l'obturation du passage par le bouchon atteigne l'intrados des panneaux refroidis à l'eau du haut de cuve du four; le seuil de la porte est alors réduit à son minimum et il n'existe plus d'accumulation de ferrailles difficile à fondre.- partially open the passage in the tank top between the inside of the oven and the outside; the door plug preferably remains supported by its upper face on the corresponding wall of the top of the furnace tank, creating a rectangular and horizontal passage between the underside of the door plug and the slagging threshold for the slag discharge, while limiting the air intakes; to ensure that the closure of the passage through the stopper reaches the lower surface of the water-cooled panels of the top of the furnace tank; the threshold of the door is then reduced to a minimum and there is no more accumulation of scrap difficult to melt.
Le brevet FR 2674946 « Four électrique de production de métal » mentionne bien une transformation de la porte de décrassage pour utiliser un bouchon réfractaire qui affleure une extension de la partie réfractaire du revêtement de la cuve du four. Ce bouchon réfractaire a pour inconvénient de venir se coller aux parois du trou dans lequel il rentre et ce d'autant plus qu'il a une forme parallélépipédique qui doit venir s'ajuster dans un logement approximativement de même forme et s'en extraire.The patent FR 2674946 "electric furnace for producing metal" mentions a transformation of the scrubber door to use a refractory plug which is flush with an extension of the refractory portion of the coating of the furnace tank. This refractory plug has the disadvantage of sticking to the walls of the hole in which it enters, especially since it has a parallelepipedal shape that must fit into a housing of approximately the same shape and extract it.
L'invention porte sur la mise en place d'un bouchon prismatique ou tronconique, de forme mâle, dans un logement de forme femelle qui lui est identique et aménagé dans le haut de cuve du four électrique,. Ce bouchon, métallique, est refroidi à l'eau ; ce refroidissement est de conception similaire à celle des panneaux refroidis à l'eau qui garnissent l'intérieur du haut de cuve du four. La face intérieure au four est éventuellement renforcée par des picots qui y sont soudés pour avoir un meilleur accrochage du laitier, une meilleure tenue aux chocs des ferrailles et une faible sensibilité aux amorçages électriques. Un revêtement céramique est envisagé comme une variante à la conception de base.The invention relates to the establishment of a prismatic or frustoconical plug, male in a housing of female form which is identical and arranged in the top of the electric furnace tank. This cap, metallic, is cooled with water; this cooling is of similar design to that of water-cooled panels that fill the inside of the top of the furnace tank. The inner face of the oven is optionally reinforced by pins welded therein to have a better grip of the slag, better resistance to shocks scrap and a low sensitivity to electrical priming. A ceramic coating is envisaged as an alternative to the basic design.
Ce bouchon garde une certaine mobilité sur son support pour pouvoir se mettre en place dans son logement qui est sujet à des déformations au cours du temps et dont la position par rapport au plancher de travail dépend de l'inclinaison du four ; en effet le four est le plus souvent en position horizontale mais il peut être incliné de quelques degrés, en avant ou en arrière, pendant une partie du cycle de coulée, période pendant laquelle le bouchon doit assurer l'étanchéité de la porte de décrassage. La mobilité du bouchon est obtenue grâce à une liaison articulée à axe horizontal avec :This cap keeps a certain mobility on its support to be able to be put in place in its housing which is subject to deformations over time and whose position relative to the working floor depends on the inclination of the oven; indeed the oven is usually in a horizontal position but it can be tilted a few degrees, forwards or backwards, during part of the casting cycle, during which time the cap must ensure the sealing of the cleaning door. The mobility of the plug is obtained thanks to an articulated connection with horizontal axis with:
- un jeu vertical par une liberté de pivotement, toutefois limitée à quelques degrés autour de cet axe,a vertical clearance by a freedom of pivoting, however limited to a few degrees around this axis,
- un jeu horizontal de plusieurs centimètres par glissement le long du même axe. Pour donner plus de liberté aux mouvements du bouchon de porte et pour que sa mise en place se fasse four déformé ou incliné de quelques degrés, le mécanisme de manutention possède des moyens d'ajustement et de contrôle de position qui sont des embiellages ou des boîtes à ressort ou des vérins hydrauliques ou tout autre moyen mécanique équivalent.- a horizontal clearance of several centimeters by sliding along the same axis. To give more freedom to the movements of the door stopper and for its implementation to be done deformed or inclined by a few degrees, the handling mechanism has adjustment means and position control which are links or boxes springs or hydraulic cylinders or any other equivalent mechanical means.
Pour l'ouverture de la porte, l'enlèvement du bouchon de porte se fait par le mécanisme de manutention qui supporte le bouchon et l'écarté de sa position normale de travail. Le mouvement est soit rectiligne avec un chariot qui se déplace dans l'axe de la porte, soit rotatif avec une potence placée sur le plancher fixe ou le plancher mobile du four. Le chariot assure aisément un positionnement précis du bouchon qui se déplace alors dans un plan vertical. Dans le cas d'une potence quand l'axe de rotation est vertical le bouchon se déplace dans un plan horizontal quand l'axe de rotation est vertical ; quand l'axe de rotation est incliné le mouvement a lieu dans un plan incliné ou même courbe pour permettre le dégagement immédiat du seuil de la porte en pivotant vers le haut.To open the door, the door plug is removed by the handling mechanism that supports the plug and away from its normal working position. The movement is either straight with a carriage that moves in the axis of the door, either rotating with a bracket placed on the fixed floor or the mobile floor of the oven. The carriage easily assures precise positioning of the plug which then moves in a vertical plane. In the case of a stem when the axis of rotation is vertical the plug moves in a horizontal plane when the axis of rotation is vertical; when the axis of rotation is inclined the movement takes place in an inclined plane or even curved to allow the immediate release of the threshold of the door by pivoting upwards.
Dans une conception particulière la mise en place du bouchon et son enlèvement se font en suivant la partie supérieure inclinée de son logement dans le haut de cuve pour laisser un espace sous le bouchon de porte, espace par lequel le laitier du four est évacué, sans avoir une ouverture complète de la porte.In a particular design the implementation of the cap and its removal are done by following the inclined upper part of its housing in the top of the tank to leave a space under the door plug, space through which the slag of the oven is removed, without have a full opening of the door.
Dans la position fermée le bouchon de porte est équipé de deux moyens auxiliaires, - l'un pour son maintient en position sur le haut de cuve, un clamage par exemple, qui libère le mécanisme du maintien du bouchon de porte d'un effort permanent, l'autre pour exercer un effort d'arrachement à son ouverture, comme un vérin hydraulique par exemple, le laitier qui tapisse l'intérieur du four exerçant une éventuelle retenue du bouchon de porte en position fermée.In the closed position the door cap is equipped with two auxiliary means, - one for its holding in position on the top of the tank, a clamage for example, which releases the mechanism of maintaining the door cap of a permanent effort the other to exert a tearing force at its opening, such as a hydraulic cylinder for example, the slag that lines the inside of the oven exerting a possible retention of the door plug in the closed position.
Dans une variante le bouchon de porte peut comporter un orifice de passage d'une lance d'injection ou d'une lance de mesure de température ou de prise d'échantillon, au détriment d'une étanchéité moins bonne. Dans une autre variante la face inférieure du bouchon de porte est constituée d'une pièce en matériau réfractaire peu sensible au contact du métal en cas de débordement intempestif de celui-ci.In a variant, the door cap may comprise a passage opening of an injection lance or of a temperature measurement or sample taking lance, to the detriment of a less good seal. In another variant, the underside of the door plug consists of a piece of refractory material insensitive to contact with the metal in the event of inadvertent overflow thereof.
Un tel bouchon de porte apporte des économies d'énergie électrique et fossile, une meilleure homogénéité de la fusion des ferrailles dans le four, une réduction de la capacité de captage des fumées et conséquemment une amélioration de la productivité du four..Such a door plug brings electrical and fossil energy savings, a better homogeneity of the melting of scrap in the furnace, a reduction of the capacity of collection of fumes and consequently an improvement of the productivity of the furnace.
Une description d'une réalisation possible du dispositif objet du présent brevet d'invention permet de mieux comprendre ses caractéristiques.A description of a possible embodiment of the device which is the subject of this patent of invention makes it possible to better understand its characteristics.
La figure 1 représente, vue de dessus et en élévation en coupe, le bouchon de porte objet du présent brevet d'invention. La figure 2 représente, vue en plan une coupe de la partie du four correspondant à la porte de décrassage avec le bouchon de porte en position « fermé » et une potence de manutention du bouchon de porte. La figure 3 représente vue en élévation la même partie de cuve avec le bouchon de porte en position « fermé ».Figure 1 shows a top view and in sectional elevation, the door cap object of this patent. 2 shows, in plan view, a section of the part of the oven corresponding to the sludge door with the door plug in the "closed" position and a handle for handling the door plug. Figure 3 shows elevational view of the same part of the tank with the door plug in the "closed" position.
Le bouchon de porte 1, prismatique, comme représenté sur les figures 1, 2 et 3 est un ensemble métallique refroidi à l'eau par un tube en acier 10 enchâssé dans des plaques 11 pour assurer un bon contact avec le logement aménagé dans le haut de cuve 6. Le bouchon de porte 1 est supporté et maintenu en place par l'intermédiaire du support 2 non refroidi, animé par le support 3, de deux mouvements dans l'axe de la porte, l'un vertical et l'autre horizontal grâce aux biellettes de suspension 31 et 32 et d'un mouvement latéral d'évacuation de l'ensemble vers une position de parking par rotation du bras 4. Le bouchon de porte 1 a une forme prismatique qui vient épouser la structure 6 du haut de cuve du four, garni de panneaux refroidis 61 et le seuil de porte 5 constitué des réfractaires 62 qui garnissent la structure 63 du bas de cuve. L'intrados du bouchon de porteThe prismatic door plug 1, as shown in FIGS. 1, 2 and 3, is a metal assembly cooled by water by a steel tube 10 embedded in plates 11 to ensure good contact with the housing arranged in the upper part. 6. The door plug 1 is supported and held in place by means of the uncooled support 2, driven by the support 3, two movements in the axis of the door, one vertical and the other horizontal thanks to the suspension rods 31 and 32 and a lateral movement evacuation of the assembly to a parking position by rotation of the arm 4. The door cap 1 has a prismatic shape which fits the structure 6 of the top furnace tank, filled with cooled panels 61 and the door sill 5 made of refractories 62 which fill the structure 63 of the bottom of tank. The underside of the door cap
1 est à 5 centimètres près au niveau de l'intrados des panneaux refroidis 61 réduisant la surface du seuil de porte 5 susceptible de recevoir de la ferraille. L'intrados du bouchon de porte 1 peut être en contact avec la ferraille chargée pour être fondue.1 is within 5 centimeters at the lower surface of the cooled panels 61 reducing the surface of the door sill 5 capable of receiving scrap. The underside of the door plug 1 may be in contact with the scrap charged to be melted.
Les surfaces de contact entre le bouchon de porte 1 et le haut de cuve 6 sont jointives dans les plans 12, 13 et 14. Ces plans de contact 12, 13 et 14 sont à faible coefficient de frottement pour feciliter la mise en place du bouchon de porte 1 dans le haut de cuve 6. Dans un mode de construction les mouvements des supports 2 et 3, commandés par les biellettes 31 et 32 sont tels que la surface supérieure du bouchon de porte 1 vient d'abord s'appuyer sur la surface 12 puis en glissant sur cette surface vient s'appliquer sur les parois 13 et 14 et sur Ie seuil de porte 5.The contact surfaces between the door plug 1 and the top of the tank 6 are contiguous in the planes 12, 13 and 14. These contact planes 12, 13 and 14 have a low coefficient of friction in order to facilitate the installation of the plug 1 in the top of tank 6. In a construction mode the movements of the supports 2 and 3, controlled by the rods 31 and 32 are such that the upper surface of the door plug 1 comes first to rely on the surface 12 and then sliding on this surface is applied on the walls 13 and 14 and on the door sill 5.
Les clames 23 solidaires du support 2 de l'ensemble du bouchon de porte 1 viennent accrocher les renforts 65 de la cuve 6 pour assurer le maintient en position fermée du bouchon de porte 1 pendant les cycles de production du four électrique. La commande de ces damages, ouverture et fermeture, est faite par 2 vérins hydrauliques 25 installés dans le support 2 du bouchon de porte 1.The clamps 23 secured to the support 2 of the assembly of the door plug 1 hook the reinforcements 65 of the tank 6 to ensure the closed position of the door plug 1 during the production cycles of the electric oven. The control of these damages, opening and closing, is made by 2 hydraulic cylinders 25 installed in the support 2 of the door plug 1.
Le mécanisme 26 permet de tirer en arrière le bouchon de porte 1 après ouverture du clamage par l'intermédiaire des 2 vérins hydrauliques 24. Le bouchon de porte 1 est alors escamoté par le support 3 et la potence 4 : la porte de décrassage est alors ouverte.The mechanism 26 makes it possible to pull back the door plug 1 after opening the clamage by means of the 2 hydraulic jacks 24. The door plug 1 is then retracted by the support 3 and the jib 4: the scrubber door is then opened.
La protection des organes hydraulique contre les contraintes thermiques n'est pas représentée sur les figures 1, 2 et 3 pour rendre la présentation plus claire. La potence 4 pivote autour de son fut 41, commandé par un système de rotation du type électrique 42, d'un angle supérieur à 90 ° en vue d'obtenir un bon dégagement devant la porte de décrassage ouverte. The protection of hydraulic members against thermal stresses is not shown in Figures 1, 2 and 3 to make the presentation clearer. The stem 4 pivots around its was 41, controlled by a rotation system of the electric type 42, an angle greater than 90 ° to obtain a good clearance in front of the open scrubber door.

Claims

REVENDICATIONS
1) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique caractérisé par un bouchon de porte (1) métallique et prismatique, manipulé de l'extérieur du four et qui s'applique sur un logement de même forme dans le haut de cuve du four (6).1) Closure device for sealing the electric oven cleaning door characterized by a metal and prismatic door plug (1), manipulated from outside the oven and which is applied to a housing of the same shape at the top oven tank (6).
2) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique caractérisé par un bouchon de porte (1) métallique et conique, manipulé de l'extérieur du four et qui s'applique sur un logement de même forme dans le haut de cuve du four (6).2) Apparatus for sealing the door of the cleaning of an electric oven characterized by a metallic and conical door plug (1), manipulated from outside the oven and which is applied to a housing of the same shape at the top oven tank (6).
3) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique suivant les revendications 1 ou 2 caractérisé par le fait que le bouchon de porte (1) est refroidi à l'eau.3) Apparatus for sealing the door of an electric furnace slag according to claims 1 or 2 characterized in that the door plug (1) is cooled with water.
4) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique suivant les revendications 1 ou 2 caractérisé par le fait que le bouchon de porte (1) affleure sensiblement à l'intrados des panneaux refroidis à l'eau (61) qui garnissent le haut de la cuve (6).4) Apparatus for sealing the electric oven slagging door according to claims 1 or 2, characterized in that the door plug (1) is substantially flush with the underside of the water-cooled panels (61) which garnish the top of the tank (6).
5) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique suivant les revendications 1 ou 2 caractérisé par le fait que le bouchon de porte (1) est manipulé par un ensemble de supports (2,3,4) qui lui donne des mouvements dans les trois axes.5) Apparatus for sealing the electric oven slagging door according to claims 1 or 2 characterized in that the door plug (1) is manipulated by a set of supports (2,3,4) which gives movements in the three axes.
6) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique suivant les revendications 1 et 5 caractérisé par le fait qu'au moins la partie supérieure du bouchon de porte (1) glisse sur la surface (12) correspondante de la cuve(6) du four.6) Apparatus for sealing the electric oven slagging door according to claims 1 and 5 characterized in that at least the upper part of the door plug (1) slides on the corresponding surface (12) of the tank (6) of the oven.
7) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique suivant la revendication 6 caractérisé par l'existence de plaques à faible coefficient de frottement rapportées sur les surfaces (12,13,14) de contact avec le haut de cuve (6).7) Device for sealing the door of an electric furnace slag according to claim 6 characterized by the existence of low friction plates reported on the surfaces (12,13,14) of contact with the top of tank (6).
8) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique selon l'une quelconque des revendications 1 à 7 caractérisé par le fait que le support (2) du bouchon de porte (1) est équipé d'un verrouillage/déverrouillage (23) du bouchon de porte en position « fermé » sur la cuve et d'un moyen d'extraction (24) du bouchon de porte (1).8) Apparatus for sealing the electric oven slagging door according to any one of claims 1 to 7 characterized in that the support (2) of the door plug (1) is equipped with a lock / unlocking (23) the door plug in the "closed" position on the tank and an extraction means (24) of the door plug (1).
9) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique selon l'une quelconque des revendications 1 à 4 caractérisé par la présence d'un orifice dans la partie verticale du bouchon de porte (1) pour le passage d'une lance.9. A device for sealing the door of an electric furnace slagging device according to any one of claims 1 to 4 characterized by the presence of an orifice in the vertical part of the door plug (1) for the passage of a lance.
10) Dispositif de fermeture étanche de la porte de décrassage d'un four électrique selon l'une quelconque des revendications 1 à 9 caractérisé par un renforcement de la partie inférieure du bouchon de porte (1) au moyen d'une pièce en matériau réfractaire. 10) Apparatus for sealing the door of the slag of an electric furnace according to any one of claims 1 to 9 characterized by a strengthening of the lower part of the door plug (1) by means of a piece of refractory material .
EP04769116A 2004-08-09 2004-08-09 Deslagging door closure for electric arc furnace Withdrawn EP1784611A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2004/002577 WO2006016201A1 (en) 2004-08-09 2004-08-09 Deslagging door closure for electric arc furnace

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EP1784611A1 true EP1784611A1 (en) 2007-05-16

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ES2529456T3 (en) 2006-06-20 2015-02-20 Empco (Canada) Ltd. Sealing apparatus for a metal furnace slag door
DE102008052800A1 (en) * 2008-10-15 2010-04-22 Sms Siemag Aktiengesellschaft Slag door for metallurgical stoves
IT1393096B1 (en) 2009-02-19 2012-04-11 Sms Concast Italia Srl METALLURGICAL BAKING DOOR IN ARCHWOOD MADE OF A LOWER MOBILE PANEL EXTRACTOR OF THE SCORE AND OF AN OPENING UPPER MOBILE PANEL TO CARRY OUT SURVEYS AND INTERVENTIONS ON THE MOLTEN METAL, AND ITS RELATED APPARATUS
US8206642B2 (en) 2010-03-16 2012-06-26 Process Technology International Pivoting slag door
ES2643468T3 (en) * 2011-02-16 2017-11-23 Sms Group S.P.A. Slag furnace door and corresponding furnace

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