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EP0532141B1 - Récipient de dégazage pour le traitement sous vide d'acier en fusion - Google Patents

Récipient de dégazage pour le traitement sous vide d'acier en fusion Download PDF

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Publication number
EP0532141B1
EP0532141B1 EP92250252A EP92250252A EP0532141B1 EP 0532141 B1 EP0532141 B1 EP 0532141B1 EP 92250252 A EP92250252 A EP 92250252A EP 92250252 A EP92250252 A EP 92250252A EP 0532141 B1 EP0532141 B1 EP 0532141B1
Authority
EP
European Patent Office
Prior art keywords
degassing vessel
central axis
vessel
plane face
exhaust gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92250252A
Other languages
German (de)
English (en)
Other versions
EP0532141A1 (fr
Inventor
Horst-Dieter Schöler
Hans-Dieter Golloch
Auke Braaksma
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0532141A1 publication Critical patent/EP0532141A1/fr
Application granted granted Critical
Publication of EP0532141B1 publication Critical patent/EP0532141B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum

Definitions

  • the invention relates to a degassing vessel for the vacuum treatment of liquid steel after the introduction of claim 1.
  • Such degassing vessels are used for the degassing of liquid steel to set the lowest carbon content.
  • Two subset methods are known. In one case, the molten steel is sucked several times in portions through a trunk into the vacuum chamber and then drained through the same trunk into the pan underneath. In the other partial quantity process, the so-called continuous process, the molten steel is sucked in through a dip tube and continuously returned to the pan through a second dip tube.
  • heating devices are arranged in the middle area of the vacuum vessel.
  • a vacuum chamber is known from the document DE-AS 15 33 933 with a refractory lining in a vacuum-tight steel armor, which forms a flat hearth in the lower part, into which a trunk for sucking in and draining off the partial quantity of a melt to be treated opens and which tapered towards the top.
  • a heater for preheating the chamber and keeping the melt warm is arranged in the upper part.
  • the chamber is closed with a vault-like cover made of refractory material with an opening for connection to the vacuum pump system.
  • Vessels are also used which are completely cylindrical without any conical constriction and which have an exhaust gas connection near the vessel head at right angles to the central axis.
  • Particles are entrained in the degassing vessels by the degassing flow.
  • the gas strikes the surfaces directing it, whereby individual particles accumulate there.
  • a larger accumulation above the heating element is regularly on the head surface of the degassing vessel, which acts like a baffle.
  • the individual particles form hanging lobes arranged in disks. These hanging rags have a firm consistency and break off from the adhesive surface at irregular intervals after reaching a certain size.
  • These structures also known as bears, fall into the partial flow and change the composition there in a negative way.
  • the aim of the invention is to avoid the disadvantages mentioned and to create a degassing vessel of the generic type which protects the heating rod against mechanical destruction using simple structural means with flow-conforming vessel design.
  • a baffle is arranged above the heating element.
  • This flat baffle plate has an inclination which guides the flowing gas to the upper vessel, which has a smaller passage area than the lower vessel.
  • the simple geometric figures circle, semicircle and straight surface are chosen.
  • the distance between the heating element and the baffle is selected so that the inside of the refractory wall is heated to a temperature at which caking does not yet occur.
  • the upper part of the degassing vessel is also constructed from the simple semi-circle and straight shape elements. This results in significant simplifications as well as cost savings with regard to the refractory lining.
  • the position of the flat surface of the cylindrical upper part is chosen so that the heating element arranged below it is in the shade with respect to falling solid bodies.
  • the passage area of the cylindrical part of the upper vessel which consists of the radius in the tubular part corresponding to the middle or lower section and almost twice the radius in the flat section, is selected to be of the same size as the passage area of the exhaust gas connection. This results in constant flow conditions in the simple construction, especially in the transition from the upper vessel to the exhaust pipe.
  • the top section of the upper part which is also designed as a half pipe, will only show a slight tendency to accommodate caking due to the favorable shape. Should such bears still form, they will fall into the partial melt without endangering the heating element. Almost no caking will occur on the straight vertical inner surfaces of the top part.
  • the show nozzle for observing the bath is protected against heat radiation from the heating element and will therefore have a longer service life.
  • the degassing vessel 10 shows a degassing vessel 10, consisting of a lower part 20, a middle part 30 and an upper part 40.
  • the degassing vessel 10 has a jacket 11 which is lined with a refractory material 12 towards the inside of the vessel.
  • the cylindrical lower part 20 has an immersion tube 21 for the inlet and an immersion tube 22 for the outlet of the melt 51 located in a pan 50.
  • the middle part 30 is likewise cylindrical in its lower region and tapers in the upper region on one side through a flat gas guide surface 31, whereas the cylindrical shape continues on the other, opposite side through a half-pipe part 41.
  • a charging device 14 is provided in the cylindrical region and a heating element 13 is arranged.
  • the upper part 40 seated on the middle part 30, is formed approximately in half as a tube 41 which is connected to a flat surface 42 provided parallel to the central axis I.
  • the upper part 40 is through a cap 43 arranged at right angles to the central axis I is completed.
  • a inspection hole 16 is provided in the cap 43.
  • the upper part 40 opens into an exhaust gas connection 15 with the passage area F.
  • the passage area of the upper part 40 is designated by A in the passage arranged parallel to the central axis I.
  • the inner radius of the refractory lining is marked with R and the radius of the vessel jacket with r.
  • FIG. 2 shows the section X-X with the exhaust gas connection 15, a part in the form of a half pipe 41 'and the flat surface 42 arranged parallel to the central axis I.
  • the gas guide surface 31 is shown in plan view. Sheath 11 and refractory lining 12 and charging device 14 are also shown. Heating element 13 is arranged at right angles to central axis I. As can be clearly seen from the sketch, the heating element is arranged in the shadow of the refractory lining 12 provided on the flat surface 42.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Details (AREA)

Claims (5)

  1. Récipient de dégazage pour le traitement sous vide d'acier en fusion, comportant une partie inférieure, une partie médiane, et une partie supérieure, présentant une enveloppe métallique qui est revêtue, vers l'intérieur du récipient, d'une matière réfractaire et qui présente, dans la partie médiane, dans la zone en regard de la partie inférieure, une forme cylindrique possédant le même rayon par rapport à celle-ci, comportant au moins un tube plongeur prévu dans le fond de la partie inférieure, qui plonge dans le bain de fusion d'une poche de coulée se trouvant en dessous, comportant une barre chauffante agencée à angle droit par rapport à l'axe central dans la partie médiane, ainsi qu'un dispositif de chargement, et comportant une fenêtre agencée dans la partie supérieure, ainsi qu'un raccord de gaz d'échappement agencé à angle droit par rapport à l'axe central et raccordé à une installation à vide, une partie de l'enveloppe (11) de la partie médiane (30) étant réalisée, dans la zone en regard de la partie supérieure (40), comme surface plane (31) qui est agencée parallèlement à la barre chauffante (13) et en se terminant sur l'axe central (I) dans le sens d'écoulement du gaz, et l'enveloppe (11) de la partie supérieure (40), dans la zone en regard de la partie médiane (30), étant constituée d'un demi-tube (41') ayant un rayon (r) correspondant à la partie inférieure et à la partie médiane (20 et 30), et d'une surface plane (42) agencée parallèlement à l'axe central (I), et étant recouverte, dans la zone en regard du raccord de gaz d'échappement (15), par un capot (43), de forme sensiblement semi-circulaire, agencé parallèlement à l'axe du raccord de gaz d'échappement.
  2. Récipient de dégazage selon la revendication 1,
    caractérisé en ce que l'inclinaison entre la surface plane (31) et l'axe central (I) vaut de 30 à 60 degrés.
  3. Récipient de dégazage selon la revendication 2,
    caractérisé en ce que l'écartement (a) de la surface plane (31) est choisie de même valeur que le rayon (R) du plus grand écartement, à angle droit par rapport à la barre chauffante (13), du revêtement réfractaire (12) de la pièce d'enveloppe tubulaire (11).
  4. Récipient de dégazage selon la revendication 1,
    caractérisé en ce que la surface plane (42) présentant un revêtement réfractaire (12) intérieurement au récipient est agencée de sorte que, en vue de dessus du récipient de dégazage (10), la barre chauffante (13) est agencée à l'abri en étant protégée contre des débris tombant de la partie supérieure (40).
  5. Récipient de dégazage selon la revendication 4,
    caractérisé en ce que la surface de passage (A), traversée par le courant, de la partie supérieure (40) présente une taille qui correspond à 0,9-1,1 fois la surface de passage (F) du raccord de gaz d'échappement (15).
EP92250252A 1991-09-12 1992-09-09 Récipient de dégazage pour le traitement sous vide d'acier en fusion Expired - Lifetime EP0532141B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4130590A DE4130590C2 (de) 1991-09-12 1991-09-12 Entgasungsgefaess fuer die vakuumbehandlung von fluessigem stahl
DE4130590 1991-09-12

Publications (2)

Publication Number Publication Date
EP0532141A1 EP0532141A1 (fr) 1993-03-17
EP0532141B1 true EP0532141B1 (fr) 1995-11-15

Family

ID=6440592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92250252A Expired - Lifetime EP0532141B1 (fr) 1991-09-12 1992-09-09 Récipient de dégazage pour le traitement sous vide d'acier en fusion

Country Status (5)

Country Link
US (1) US5299784A (fr)
EP (1) EP0532141B1 (fr)
JP (1) JPH05195044A (fr)
AT (1) ATE130374T1 (fr)
DE (2) DE4130590C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19518900C1 (de) * 1995-05-26 1996-08-08 Technometal Ges Fuer Metalltec Verfahren zur Nachverbrennung von bei der Vakuumbehandlung von Stahl entstehenden Reaktionsgasen
DE19822159A1 (de) 1998-05-16 1999-11-18 Technometal Ges Fuer Metalltec Mit einer Wasserkühlung versehenes Gefäß für die Behandlung von flüssigem Stahl

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE153393C (fr) *
LU36943A1 (fr) * 1958-03-10
DE1533933C3 (de) * 1967-04-28 1974-12-12 Hoesch Werke Ag, 4600 Dortmund Vorrichtung zum Entgasen von Stahlschmelzen
GB1184537A (en) * 1967-04-28 1970-03-18 Hoesch Ag Improvements in Vacuum Vessels for Degassing Molten Metals.
DE3174127D1 (en) * 1981-07-27 1986-04-24 Thyssen Ag Vessel for the treatment of molten metal baths
US5096164A (en) * 1990-06-25 1992-03-17 Technometal Gesellschaft Fur Metalltechnologie Gmbh Steel-processing vessel having a graphite rod heating means

Also Published As

Publication number Publication date
DE4130590A1 (de) 1993-03-25
DE59204334D1 (de) 1995-12-21
ATE130374T1 (de) 1995-12-15
JPH05195044A (ja) 1993-08-03
DE4130590C2 (de) 1993-11-04
EP0532141A1 (fr) 1993-03-17
US5299784A (en) 1994-04-05

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