EP3412781A1 - Protection device for vacuum converter - Google Patents

Protection device for vacuum converter Download PDF

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Publication number
EP3412781A1
EP3412781A1 EP18173958.2A EP18173958A EP3412781A1 EP 3412781 A1 EP3412781 A1 EP 3412781A1 EP 18173958 A EP18173958 A EP 18173958A EP 3412781 A1 EP3412781 A1 EP 3412781A1
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EP
European Patent Office
Prior art keywords
cover
flange
converter
vacuum
protection device
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
EP18173958.2A
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German (de)
French (fr)
Other versions
EP3412781B1 (en
Inventor
Johann Reichel
Thomas Germershausen
Jan Bader
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.)
SMS Group GmbH
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SMS Group GmbH
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Publication of EP3412781A1 publication Critical patent/EP3412781A1/en
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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
    • 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
    • C21C5/4693—Skull removal; Cleaning of the converter mouth

Definitions

  • the present invention relates to a protective device for the surface of a flange associated with the mouth of a tiltable vacuum converter.
  • the vacuum converter is a common device for the production of steel grades, which may be characterized by low or ultra-low carbon contents.
  • the metallurgical treatment in the vacuum converter is subdivided into the atmospheric phase, usually by the thermodynamic reaction equilibrium under atmospheric pressure, and the vacuum phase in which the equilibria in the alloy are to be controlled under lower pressures.
  • the vacuum converter is covered by a sealing cover. This allows a reduction in the pressure of the atmosphere in the vacuum converter via a vacuum pump system.
  • the efficiency of the vacuum system depends greatly on the tightness between the flange of the converter vessel and the vacuum cover. It is the basic technical problem to keep the flange surface clean and free of metal or slag splash. High surface cleanliness reduces possible air leaks and ensures that the subsequent vacuum treatment is carried out with high accuracy and in the time interval provided for this purpose.
  • the splashguard cover comprises an upper cover ring having a through hole, a conical cylinder and a base ring, the upper cover ring being disposed at the upper end of the conical cylinder, and the inner side of the base ring being fixed to the lower end of the conical cylinder.
  • the splash guard also includes a cover ring with an upper Cover ring top plate, a cover cover hose cover shell and a pure copper lid cover plate.
  • the publication US Pat. No. 6,830,723 B2 discloses a device for treating molten metal in a treatment vessel having a removable cover or hood. Sealing means are provided between the cover and the container to provide a gastight treatment zone.
  • the sealing means comprise mating peripheral flanges on the container and the cover, the cover flange having two spaced annular sealing strips for the container flanges and a metallic annular splash guard.
  • This weather strip comprises a heat-insulating strip formed from a deformable fibrous refractory material to provide a gastight thermal barrier between the interior and exterior of the vessel and a metal ring strip on which the cover rests on the vessel.
  • the surface of the flange opening of the vacuum converter for the reasons described above must be as free of incrustations.
  • workers In order to be able to ensure this and to enable a reasonably cleaned flange surface, workers must be laboriously secured and protected against heat radiation. Occupational health and safety requirements are correspondingly high and burdensome, so that workers' health can be guaranteed. These security measures are associated with a considerable administrative effort. In addition, they are time consuming and costly due to the loss of production.
  • the central passage substantially corresponds to the dimensions of the converter mouth.
  • the protective device encloses and protects precisely the side surface and the surface of the flange.
  • the cover with at least one securing means which can be releasably connected to the vacuum converter.
  • the recess of the protective device according to the invention may be formed cone, nose or prismatic and adapted individually to the respective converter flange.
  • the protective device may consist of a simple, low-alloy, low-cost structural steel. To protect the surface of the protector or cover and facilitate cleaning, it may be provided with a refractory, pressure-elastic coating. This coating is intended to prevent caking, encrustations and remnants of melting on the protective device. The use cycle of the protection device can thereby be extended not insignificant.
  • the single figure shows the side view of the upper part of a vacuum converter in section with a protective device according to the invention.
  • the protection device 10 consists essentially of a disc-shaped cover 11, which can be placed on a flange 12 of a vacuum converter 13.
  • an annular recess 15 is provided on the underside 14 of the cover 11. The cover 11 engages around the flange 12 of the vacuum converter 13 in a form-fitting manner.
  • the cover 11 can be raised, moved and lowered, 16 transporting bracket 17 are arranged on its upper side.
  • the cover 11 has a centrally and substantially circular passage 18 through which gases and slag splashes can escape during the atmospheric treatment phase.
  • At least one securing means 19 is provided, that the protective device 10 is locked relative to the flange 12.
  • a hook 20 may be welded to the outside of the vacuum converter 13.
  • the hook 20 in turn can be connected via connecting means 21 releasably connected to the cover 11.
  • connecting means 21 chains are particularly conceivable that can be brought to tension with Glasspindelstangen.

Abstract

Schutzvorrichtung für die Oberfläche eines, der Konvertermündung eines kippbaren Vakuum-Konverters (13) zugeordneten Flansches (12). Die Oberfläche des Flansches (12) ist mit einer einen zentrischen Durchlass aufweisenden Abdeckung (11) abdeckbar, wobei die Abdeckung (11) an ihrer, dem Konverter zugewandten Unterseite (14) eine den Flansch (12) formschlüssig umgreifende ringförmige Ausnehmung (15) aufweist.

Figure imgaf001
Protective device for the surface of a flange (12) associated with the converter mouth of a tiltable vacuum converter (13). The surface of the flange (12) can be covered with a cover (11) having a central passage, the cover (11) having on its bottom side (14) facing the converter a ring-shaped recess (15) which surrounds the flange (12) in a form-fitting manner ,
Figure imgaf001

Description

Die vorliegende Erfindung betrifft eine Schutzvorrichtung für die Oberfläche eines der Mündung eines kippbaren Vakuum-Konverters zugeordneten Flansches.The present invention relates to a protective device for the surface of a flange associated with the mouth of a tiltable vacuum converter.

Der Vakuum-Konverter ist eine gängige Vorrichtung für die Produktion von Stahlsorten, die durch niedrige oder ultra-niedrige Kohlenstoffgehalte gekennzeichnet sein können. Die metallurgische Behandlung im Vakuum-Konverter wird in die atmosphärische Phase, die gewöhnlich durch das thermodynamische Reaktionsgleichgewicht unter atmosphärischem Druck stattfindet, und in die Vakuumphase unterteilt, in der die Gleichgewichte in der Schmelze bzw. Legierung unter niedrigeren Drücken kontrolliert werden sollen.The vacuum converter is a common device for the production of steel grades, which may be characterized by low or ultra-low carbon contents. The metallurgical treatment in the vacuum converter is subdivided into the atmospheric phase, usually by the thermodynamic reaction equilibrium under atmospheric pressure, and the vacuum phase in which the equilibria in the alloy are to be controlled under lower pressures.

Nach der atmosphärischen Behandlung wird der Vakuum-Konverter durch eine Abdichtabdeckung abgedeckt. Dadurch wird eine Druckreduzierung der in dem Vakuum-Konverter befindlichen Atmosphäre über ein Vakuumpumpensystem ermöglicht.After the atmospheric treatment, the vacuum converter is covered by a sealing cover. This allows a reduction in the pressure of the atmosphere in the vacuum converter via a vacuum pump system.

Der Wirkungsgrad des Vakuumsystems hängt stark von der Dichtheit zwischen dem Flansch des Konvertergefäßes und der Vakuumabdeckung ab. Es ist das grundlegende technische Problem, die Flanschoberfläche sauber und frei von Metall- oder Schlackenspritzen zu halten. Hohe Oberflächenreinheit reduziert mögliche Luftleckagen und sorgt für die Durchführung der nachfolgenden Vakuumbehandlung mit hoher Genauigkeit und in dem hierfür vorgesehen Zeitintervall.The efficiency of the vacuum system depends greatly on the tightness between the flange of the converter vessel and the vacuum cover. It is the basic technical problem to keep the flange surface clean and free of metal or slag splash. High surface cleanliness reduces possible air leaks and ensures that the subsequent vacuum treatment is carried out with high accuracy and in the time interval provided for this purpose.

Aus der CN 102719624 A ist eine Spritzschutzabdeckung für einen Sauerstoff-Blas- und Entkarbonisierungs-Vakuum-Raffinationsofen bekannt. Die Spritzschutzabdeckung umfasst einen oberen Deckelring mit einem Durchgangsloch, einen konischen Zylinder und einen Basisring, wobei der obere Abdeckring am oberen Ende des konischen Zylinders angeordnet ist, und die Innenseite des Basisrings am unteren Ende des konischen Zylinders befestigt ist. Die Spritzschutzabdeckung umfasst ferner einen Abdeckring mit einer oberen Abdeckring-Oberplatte, einer Deckel-Deckschlauch-Deckschale und einer reinen Kupferdeckel-Deckelunterplatte.From the CN 102719624 A a splash guard is known for an oxygen blowing and decarbonating vacuum refining furnace. The splashguard cover comprises an upper cover ring having a through hole, a conical cylinder and a base ring, the upper cover ring being disposed at the upper end of the conical cylinder, and the inner side of the base ring being fixed to the lower end of the conical cylinder. The splash guard also includes a cover ring with an upper Cover ring top plate, a cover cover hose cover shell and a pure copper lid cover plate.

Die Druckschrift US 6,830,723 B2 offenbart eine Vorrichtung zur Behandlung von geschmolzenem Metall in einem Behandlungsgefäß mit einer entfernbaren Abdeckung oder Haube. Dichtungsmittel sind zwischen der Abdeckung und dem Behälter vorgesehen, um eine gasdichte Behandlungszone zu schaffen. Die Dichtungsmittel umfassen zusammenpassende Umfangsflansche an dem Behälter und der Abdeckung, wobei der Abdeckflansch zwei beabstandete ringförmige Dichtungsstreifen für die Behälterflansche und einen metallischen ringförmigen Spritzschutz aufweist. Dieser Dichtungsstreifen umfasst einen Wärmedämmstreifen, der aus einem verformbaren faserigen feuerfesten Material ausgebildet ist, um eine gasdichte thermische Barriere zwischen dem Inneren und dem Äußeren des Gefäßes und einem Metallringstreifen zu schaffen, auf dem die Abdeckung auf dem Behälter aufliegt.The publication US Pat. No. 6,830,723 B2 discloses a device for treating molten metal in a treatment vessel having a removable cover or hood. Sealing means are provided between the cover and the container to provide a gastight treatment zone. The sealing means comprise mating peripheral flanges on the container and the cover, the cover flange having two spaced annular sealing strips for the container flanges and a metallic annular splash guard. This weather strip comprises a heat-insulating strip formed from a deformable fibrous refractory material to provide a gastight thermal barrier between the interior and exterior of the vessel and a metal ring strip on which the cover rests on the vessel.

Es hat sich gezeigt, dass es bei den oben beschriebenen Schutz- und Abdeckvorrichtungen immer wieder zu ungewollten Verzögerungen gekommen ist. Beim Wechseln der Betriebsmodi zwischen der atmosphärischen Phase und der Vakuumphase muss ein Vakuumdeckel auf der Flanschoberfläche der Flanschöffnung des Vakuum-Konverters aufgesetzt werden.It has been shown that it has repeatedly come to unwanted delays in the protective and Abdeckvorrichtungen described above. When changing the operating modes between the atmospheric phase and the vacuum phase, a vacuum cap must be placed on the flange surface of the flange opening of the vacuum converter.

Hierzu muss die Oberfläche der Flanschöffnung des Vakuum-Konverters aus den oben beschriebenen Gründen möglichst frei von Verkrustungen sein. Um dies sicherstellen zu können und eine leidlich gereinigte Flanschoberfläche zu ermöglichen, müssen hierfür Arbeiter aufwendig gesichert und vor der Hitzestrahlung geschützt werden. Die Anforderungen an den Arbeitsschutz sind dementsprechend hoch und aufwendig, damit die Gesundheit der Arbeiter gewährleistet werden kann. Diese Sicherheitsvorkehrungen sind mit einem erheblichen administrativen Aufwand verbunden. Zudem sind sie zeitaufwendig und wegen des Produktionsausfalls kostenintensiv.For this purpose, the surface of the flange opening of the vacuum converter for the reasons described above must be as free of incrustations. In order to be able to ensure this and to enable a reasonably cleaned flange surface, workers must be laboriously secured and protected against heat radiation. Occupational health and safety requirements are correspondingly high and burdensome, so that workers' health can be guaranteed. These security measures are associated with a considerable administrative effort. In addition, they are time consuming and costly due to the loss of production.

Es ist daher Aufgabe der vorliegenden Erfindung, eine Schutzvorrichtung zu schaffen, mit der die oben genannten Nachteile überwunden werden können.It is therefore an object of the present invention to provide a protection device create, with the above-mentioned disadvantages can be overcome.

Diese Aufgabe wird durch die im Anspruch 1 angegebenen Merkmale gelöst, insbesondere dadurch, dass die Oberfläche des Flansches mit einer einen zentrischen Durchlass aufweisenden Abdeckung abdeckbar ist, und die Abdeckung an ihrer, dem Konverter zugewandten Unterseite eine den Flansch formschlüssig umgreifende ringförmige Ausnehmung aufweist. Hierdurch wird während der atmosphärischen Behandlung der Schmelze im Konverter die Oberfläche der Flanschöffnung vor umherfliegenden Schlacken- und Schmelzenteilchen wirksam geschützt.This object is achieved by the features specified in claim 1, in particular by the fact that the surface of the flange with a central passage having cover can be covered, and the cover on its, the converter-facing underside a flange having a form-fitting encompassing annular recess. This effectively protects the surface of the flange opening from airborne slag and melt particles during atmospheric treatment of the melt in the converter.

Dabei ist vorgesehen, dass der zentrische Durchlass im Wesentlichen den Abmessungen der Konvertermündung entspricht. Dadurch umschließt und schützt die Schutzvorrichtung passgenau die Seitenfläche und die Oberfläche des Flansches.It is provided that the central passage substantially corresponds to the dimensions of the converter mouth. As a result, the protective device encloses and protects precisely the side surface and the surface of the flange.

Für den Transport der Schutzvorrichtung aus einer Ruheposition in die Arbeitsposition bzw. zum Auf- und Absetzen der Schutzvorrichtung beispielsweise mittels eines Kranes sind an der Oberfläche der Schutzvorrichtung Transportbügel vorgesehen.For the transport of the protective device from a rest position to the working position or for raising and lowering of the protective device, for example by means of a crane transport bracket are provided on the surface of the protective device.

Zur Sicherung der Schutzvorrichtung ist es vorgesehen, die Abdeckung mit mindestens einem Sicherungsmittel zu versehen, das lösbar mit dem Vakuum-Konverter verbunden werden kann.To secure the protective device, it is provided to provide the cover with at least one securing means which can be releasably connected to the vacuum converter.

Die Ausnehmung der erfindungsgemäßen Schutzvorrichtung kann kegel-, nasen- oder prismenförmig ausgebildet und individuell dem jeweiligen Konverterflansch angepasst sein.The recess of the protective device according to the invention may be formed cone, nose or prismatic and adapted individually to the respective converter flange.

Die Schutzvorrichtung kann aus einem einfachen, niedrig legierten, preisgünstigen Baustahl bestehen. Um die Oberfläche der Schutzvorrichtung bzw. der Abdeckung zu schützen und ein Säubern zu erleichtern, kann sie mit einer feuerfesten, druckelastischen Beschichtung versehen sein. Diese Beschichtung soll Anbackungen, Verkrustungen und Reste von Aufschmelzungen an der Schutzvorrichtung verhindern. Der Einsatzzyklus der Schutzvorrichtung kann dadurch nicht unerheblich verlängert werden.The protective device may consist of a simple, low-alloy, low-cost structural steel. To protect the surface of the protector or cover and facilitate cleaning, it may be provided with a refractory, pressure-elastic coating. This coating is intended to prevent caking, encrustations and remnants of melting on the protective device. The use cycle of the protection device can thereby be extended not insignificant.

Die Erfindung wird im Folgenden anhand einer beispielhaften Ausführungsform unter Bezugnahme auf die beigefügte Zeichnung näher beschrieben.The invention will be described in more detail below with reference to an exemplary embodiment with reference to the accompanying drawings.

Die einzige Figur zeigt die Seitenansicht des oberen Teils eines Vakuum-Konverters im Schnitt mit einer erfindungsgemäßen Schutzvorrichtung.The single figure shows the side view of the upper part of a vacuum converter in section with a protective device according to the invention.

Wie in der Zeichnung dargestellt, besteht die Schutzvorrichtung 10 im Wesentlichen aus einer scheibenförmigen Abdeckung 11, die auf einem Flansch 12 eines Vakuum-Konverters 13 aufgesetzt werden kann. Hierzu ist an der Unterseite 14 der Abdeckung 11 eine ringförmige Ausnehmung 15 vorgesehen. Die Abdeckung 11 umgreift den Flansch 12 des Vakuum-Konverters 13 formschlüssig.As shown in the drawing, the protection device 10 consists essentially of a disc-shaped cover 11, which can be placed on a flange 12 of a vacuum converter 13. For this purpose, an annular recess 15 is provided on the underside 14 of the cover 11. The cover 11 engages around the flange 12 of the vacuum converter 13 in a form-fitting manner.

Damit die Abdeckung 11 angehoben, verfahren und abgesenkt werden kann, sind an ihrer Oberseite 16 Transportbügel 17 angeordnet. Die Abdeckung 11 weist einen zentrisch und im Wesentlichen kreisrunden Durchlass 18 auf, über den während der atmosphärischen Behandlungsphase Gase und Schlackenspritzer austreten können.So that the cover 11 can be raised, moved and lowered, 16 transporting bracket 17 are arranged on its upper side. The cover 11 has a centrally and substantially circular passage 18 through which gases and slag splashes can escape during the atmospheric treatment phase.

Um die Abdeckung 11 beim Kippen des Vakuum-Konverters 13 zu sichern, ist mindestens ein Sicherungsmittel 19 vorgesehen, dass die Schutzvorrichtung 10 gegenüber dem Flansch 12 arretiert. Hierzu kann an der Außenseite des Vakuum-Konverters 13 beispielsweise ein Haken 20 angeschweißt sein.In order to secure the cover 11 when tilting the vacuum converter 13, at least one securing means 19 is provided, that the protective device 10 is locked relative to the flange 12. For this purpose, for example, a hook 20 may be welded to the outside of the vacuum converter 13.

Der Haken 20 wiederum kann über Verbindungsmittel 21 lösbar mit der Abdeckung 11 verbunden werden. Als Verbindungsmittel 21 sind insbesondere Ketten denkbar, die mit Zugspindelstangen auf Spannung gebracht werden können.The hook 20 in turn can be connected via connecting means 21 releasably connected to the cover 11. As a connecting means 21 chains are particularly conceivable that can be brought to tension with Zugspindelstangen.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Schutzvorrichtungguard
1111
Abdeckungcover
1212
Flanschflange
1313
Vakuum-KonverterVacuum Converter
1414
Unterseitebottom
1515
ringförmige Ausnehmungannular recess
1616
Oberseitetop
1717
Transportbügeltransport bracket
1818
Durchlasspassage
1919
Sicherungsmittelsecuring means
2020
Hakenhook
2121
Verbindungsmittelconnecting means

Claims (6)

Schutzvorrichtung für die Oberfläche eines, der Mündung eines kippbaren Vakuum-Konverters (13) zugeordneten Flansches (12), dadurch gekennzeichnet, dass die Oberfläche des Flansches (12) mit einer einen zentrischen Durchlass aufweisenden Abdeckung (11) abdeckbar ist, und die Abdeckung (11) an ihrer, dem Konverter zugewandten Unterseite (14) eine den Flansch (12) formschlüssig umgreifende ringförmige Ausnehmung (15) aufweist.Protective device for the surface of a flange (12) associated with the mouth of a tiltable vacuum converter (13), characterized in that the surface of the flange (12) can be covered by a cover (11) having a central passage, and the cover (11) 11) on its, the converter-facing underside (14) has a flange (12) form-fitting encompassing annular recess (15). Schutzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Abdeckung (11) an ihrer Oberseite (16) mit Transportbügeln (17) versehen ist.Protection device according to claim 1, characterized in that the cover (11) is provided on its upper side (16) with transporting straps (17). Schutzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Abdeckung (11) mit mindestens einem Sicherungsmittel (19) versehen ist.Protective device according to claim 1, characterized in that the cover (11) is provided with at least one securing means (19). Schutzvorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass das Sicherungsmittel (19) die Abdeckung (11) lösbar mit dem Vakuum-Konverter (13) verbindet.Protection device according to claim 3, characterized in that the securing means (19) releasably connects the cover (11) to the vacuum converter (13). Schutzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Abdeckung (11) aus Baustahl besteht.Protection device according to claim 1, characterized in that the cover (11) consists of structural steel. Schutzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Oberseite (16) der Abdeckung (11) mit einer feuerfesten, druckelastischen Beschichtung versehen ist.Protection device according to claim 1, characterized in that the upper side (16) of the cover (11) is provided with a refractory, pressure-elastic coating.
EP18173958.2A 2017-06-08 2018-05-24 Protection device for vacuum converter Active EP3412781B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017112615.5A DE102017112615A1 (en) 2017-06-08 2017-06-08 Protection device for vacuum converter

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EP3412781A1 true EP3412781A1 (en) 2018-12-12
EP3412781B1 EP3412781B1 (en) 2019-07-24

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3601379A (en) * 1968-06-27 1971-08-24 Demag Ag Cooling structure for a metallurgical furnace
US4014530A (en) * 1975-08-01 1977-03-29 Demag Aktiengesellschaft Protective nozzle for metallurgic vessels, particularly for steel mill converters

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19749829A1 (en) * 1997-11-11 1999-05-12 Intocast Ag Metallurgical vessel
US6830723B2 (en) 2001-10-01 2004-12-14 Alcan International Limited Apparatus for treating molten metal having a sealed treatment zone
CN102719624A (en) 2012-06-27 2012-10-10 山西太钢不锈钢股份有限公司 Anti-splashing cover for oxygen-blowing and de-carbonizing vacuum refining furnace

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3601379A (en) * 1968-06-27 1971-08-24 Demag Ag Cooling structure for a metallurgical furnace
US4014530A (en) * 1975-08-01 1977-03-29 Demag Aktiengesellschaft Protective nozzle for metallurgic vessels, particularly for steel mill converters

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EP3412781B1 (en) 2019-07-24

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