EP0414308B1 - Construction du trou de coulée d'un récipient métallurgique, sa méthode de remplacement et brique à cet effet - Google Patents

Construction du trou de coulée d'un récipient métallurgique, sa méthode de remplacement et brique à cet effet Download PDF

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Publication number
EP0414308B1
EP0414308B1 EP90202216A EP90202216A EP0414308B1 EP 0414308 B1 EP0414308 B1 EP 0414308B1 EP 90202216 A EP90202216 A EP 90202216A EP 90202216 A EP90202216 A EP 90202216A EP 0414308 B1 EP0414308 B1 EP 0414308B1
Authority
EP
European Patent Office
Prior art keywords
tap hole
bricks
annular
projection
brick
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
EP90202216A
Other languages
German (de)
English (en)
Other versions
EP0414308A1 (fr
EP0414308B2 (fr
Inventor
Theodorus Wendelinus De Wit
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.)
Tata Steel Ijmuiden BV
Original Assignee
Hoogovens Groep BV
Hoogovens Staal BV
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19855186&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0414308(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hoogovens Groep BV, Hoogovens Staal BV filed Critical Hoogovens Groep BV
Priority to AT90202216T priority Critical patent/ATE100862T1/de
Publication of EP0414308A1 publication Critical patent/EP0414308A1/fr
Publication of EP0414308B1 publication Critical patent/EP0414308B1/fr
Application granted granted Critical
Publication of EP0414308B2 publication Critical patent/EP0414308B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F27D3/1509—Tapping equipment
    • F27D3/1518—Tapholes
    • 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
    • C21C5/44—Refractory linings
    • C21C5/445—Lining or repairing the taphole
    • 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
    • C21C5/4653—Tapholes; Opening or plugging thereof

Definitions

  • the invention relates to a tap hole construction of a metallurgical vessel having a wall with a refractory lining and a tap hole in the vessel wall for discharging liquid metal out of the vessel.
  • the invention also relates to a method of renewing such a tap hole construction and to a brick for use in such a construction and such a method.
  • the flow passage is provided by an assembly of annular bricks, which are arranged in the metallurgical vessel wall.
  • a refractory casting or spraying mass or material is introduced between the annular bricks and the refractory lining, to fix the bricks in place.
  • Such a metallurgical vessel is known from the practice of steel making, for example the oxygen steel process. See for example NL-A-6707057. In such a vessel a process is performed on the crude liquid metal in the vessel until a desired quality is reached, whereupon the finished steel is discharged out of the vessel through the tap hole by tilting the vessel.
  • tapping time reduces to, for example, about four minutes. Then it is necessary to repair or renew the tap hole in order to avoid further reduction in tapping time and to prevent the refractory lining of the vessel wall from being affected.
  • the refractory casting or spraying compound Prior to the tap hole being repaired, the refractory casting or spraying compound still remaining is removed by being drilled out. Then an assembly of annular bricks is placed in the vessel wall where the tap hole is located. To this end the metallurgical vessel is brought into a tilted position and the assembly of annular bricks is held in the correct place using a fork lift truck for example. The annular bricks are prevented from moving laterally relative to each other by interlocking recesses and projections. Because this assembly is very heavy it is very difficult to position and maintain the annular bricks at the location of the tap hole.
  • the repair is completed by introducing a refractory casting or spraying compound between the annular bricks and the refractory lining of the vessel wall. Then the fork lift truck is driven away.
  • the object of the invention is to achieve the better and easier positioning and maintenance of the position of the assembly of annular bricks at the location of the tap hole.
  • the tap hole construction in accordance with the invention is set out in claim 1.
  • the projection or projections on the brick ensure that the annular brick in question, and because the bricks are interlocked the whole assembly of the annular bricks, maintains at least a minimum distance from the refractory lining of the vessel wall, even after the casting or spraying compound has been introduced.
  • the tap hole construction in accordance with the invention further presents the advantage that a slag stopper as described in NL-A-8801231 (EP-A-0 341 798) of the present applicants is more effective. It is believed that, with the better location of the tap hole, the slag stopper is able to seal off the tap hole better as soon as slag is about to be tapped. Consequently, at the same time the quantity of steel tapped from a charge may be higher.
  • Another significant advantage of the invention is that it can improve safety. Repairing the tap hole in accordance with the current procedure necessitates the permanent presence of the fork lift truck in order to hold the assembly of annular bricks properly in position. This means thatthere is no room for a roof structure under which the casting or spraying compound can be introduced, giving protection to an operator from any waste which might fall from the stack above the metallurgical vessel. With the invention the fork lift truck may be driven away directly after the assembly of annular bricks has been put in position and a mobile roofing structure may then be placed in the spot where the fork lift truck was standing so that protection is given against falling waste.
  • each annular brick provided with a projection has three such projections spaced circumferentially.
  • each projection has the shape of a ridge extending in the axial direction of the brick. This helps achieve optimum centering of the new tap hole.
  • the invention further provides a method of renewing a tap hole construction of a metallurgical vessel as set out in claim 5, and a tap hole brick as set out in claim 9.
  • Metallurgical vessels of the kind to which the invention relates are known and do not require further description here.
  • the tap hole constructions of two metallurgical vessels are shown in Fig. 1 and Fig. 2 in accordance with the known state of the art, and in accordance with the invention respectively.
  • the tap hole passage 1 is provided by the central hole of an assembly of annular moulded bricks 4 located within a permanent refractory lining 2 of the vessel wall 3 of the metallurgical vessel.
  • These moulded bricks are prevented from moving laterally relative to one another (i.e. radially with respect to the tap hole axis) by cooperating recesses and projections at their axial end faces so that the tap hole 1 is formed with an essentially smooth inner wall 5.
  • a refractory casting or spraying compound 6 is introduced between the annular bricks 4 and the refractory lining 2, to fix the bricks 4 in place.
  • Fig. 1 shows that the tap hole 1 of known construction is not centered well in the vessel wall 3. This has the result that the metallurgical vessel requires repair of the tap hole 1 earlier in order to avoid the risk of the permanent refractory lining 2 being affected.
  • each centering brick is provided with three circumferentially spaced projections 7 projecting from its outer face radially. These projections 7 are in this example shaped as axially extending ridges (see Figs. 2 and 3). The remaining bricks 4 have no such radial projection.
  • the metallurgical vessel of this embodiment is able to process more charges than the vessel in accordance with Fig. 1 before repair of the tap hole 1 becomes necessary.
  • the projections 7 extend approximately to the inner faces of the refractory bricks 2 and provide centering of the tap hole 1 in the vessel wall 3, so that excellent resistance is achieved against displacement of the assembly of moulded bricks 4, both during and after the introduction of the refractory casting or spraying compound 6.
  • the projections 7 thus become embedded in the compound 6.
  • a tap hole 1 made in this manner is, taken by itself, much easier to center than the tap hole of the metallurgical vessel of Fig. 1.
  • An optimally centered tap hole improves the action of a slag stopper used with the metallurgical vessel. This slag stopper is able to close the tap hole properly and on time, so that steel may be tapped slag-free for a maximum tapping time. This means that there is a high steel yield from a charge.
  • Fig. 3 shows a single annular moulded brick 4 in accordance with the invention which is provided with the three ridges 7 for centering. It can be seen that the three ridges 7 are uniformly spaced apart occupying in total less than 180° of the circumference of the brick 4, thus permitting the introduction of the compound 6 while achieving good centering of the assembly of bricks 4.
  • Such a moulded brick is, as mentioned above, also provided with a recessed region 8 and a projection 9 for cooperation with a projection and recess respectively of an abutting moulded brick 4 to prevent bricks from moving against one another laterally. While the annular bricks 4 are here illustrated with cylindrical outer peripheries, other shaper may be used within the invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (10)

1. Construction de trou de coulée d'une cuve métallurgique ayant une paroi avec un revêtement réfractaire, ladite construction comprenant une pluralité de briques annulaires (4) disposées dans la direction longitudinale du trou de coulée et comportant des ouvertures centrales qui fournissent le passage d'écoulement (1) du trou de coulée, et un matériau réfractaire (6) de moulage ou de projection placé autour desdites briques (4) pour les fixer en place,
caractérisée en ce que l'une au moins desdites briques annulaires (4) comporte au moins une saillie (7) dépassant radialement de sa face périphérique externe et noyée dans ledit matériau réfractaire (6) de moulage ou de projection, la (les) saillie (s) (7) s'étend (ent) approximativement jusqu'à la surface du revêtement réfractaire permanent (2) et assure (nt) le centrage du trou de coulée (1) dans la cuve (3).
2. Construction de trou de coulée selon la revendication 1, dans laquelle la brique annulaire (4), ou chacune d'elles, ayant au moins une saillie (7) comporte trois de ces saillies (7) réparties à la circonférence autour de la brique.
3. Construction de trou de coulée selon la revendication 1 ou la revendication 2, dans laquelle la saillie (7), ou chacune d'elles, a une forme de nervure s'étendant dans le sens axial de la brique.
4. Construction de trou de coulée selon l'une quelconque des revendications 1 à 3, dans laquelle deux desdites briques annulaires comportent chacune au moins une saillie (7), lesdites deux briques étant situées respectivement près de l'extrémité interne et de l'extrémité externe du trou de coulée.
5. Procédé de rénovation d'une construction de trou de coulée d'une cuve métallurgique comportant un revêtement réfractaire, construction de trou de coulée qui comprend une pluralité de briques annulaires (4) disposées dans le sens longitudinal du trou de coulée et présentant des ouvertures centrales qui fournissent le passage d'écoulement (1) du trou de coulée, et un matériau réfractaire (6) de moulage ou de projection introduit autour des briques, ledit procédé incluant les étapes suivantes:
1) retrait des briques annulaires (4) et du matériau réfractaire (6) de projection ou de moulage de la construction de trou de coulée usée de façon à fournir un orifice destiné à recevoir la nouvelle construction de trou de coulée,
2) mise en place d'une nouvelle pluraiité desdites briques annulaires (4) dans ledit orifice, et
3) introduction d'un nouveau matériau (6) de moulage ou de projection autour desdites nouvelles briques annulaires pour les fixer dans ledit orifice,
caractérisé en ce que l'une au moins desdites nouvelles briques annulaires présente au moins une saillie (7) qui dépasse radialement de sa face périphérique externe afin d'aider à la mise en place desdites nouvelles briques (4) dans ledit orifice tout en permettant l'introduction dudit matériau (6) de moulage ou de projection.
6. Procédé selon la revendication 5, dans lequel la brique annulaire (4), ou chacune d'elles, comportant au moins une saillie (7) présente trois de ces saillies (7) réparties à la circonférence autour de la brique.
7. Procédé selon la revendication 5 ou la revendication 6, dans lequel la saillie (7), ou chacune d'elles, a une forme de nervure qui s'étend dans le sens axial de la brique.
8. Procédé selon l'une quelconque des revendications 5 à 7, dans lequel deux desdites briques parmi lesdites nouvelles briques (4) comportent chacune au moins une saillie (7), lesdites deux briques étant respectivement situées près de l'extrémité interne et de l'extrémité externe du trou de coulée.
9. Brique (4) annulaire pour trou de coulée destinée à être utilisée dans une construction de trou de coulée conforme à la revendication 1 ou dans un procédé conforme à la revendication 5, ayant une face périphérique externe globalement cylindrique et au moins une saillie (7) qui dépasse vers l'extérieur de ladite face externe, la (les) saillie (s) s'étendant à la circonférence de ladite brique sur moins de 360°.
10. Brique selon la revendication 9 qui comporte trois desdites saillies (7) ayant la forme de nervures qui s'étendent axialement.
EP90202216A 1989-08-21 1990-08-16 Construction du trou de coulée d'un récipient métallurgique, sa méthode de remplacement et brique à cet effet Expired - Lifetime EP0414308B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90202216T ATE100862T1 (de) 1989-08-21 1990-08-16 Abstichanordnung, verfahren zur neuzustellung und abstichlochstein fuer ein metallurgisches gefaess.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8902101 1989-08-21
NL8902101A NL8902101A (nl) 1989-08-21 1989-08-21 Metallurgisch vat, alsmede een daarbij toe te passen ringvormige steen.

Publications (3)

Publication Number Publication Date
EP0414308A1 EP0414308A1 (fr) 1991-02-27
EP0414308B1 true EP0414308B1 (fr) 1994-01-26
EP0414308B2 EP0414308B2 (fr) 1998-12-16

Family

ID=19855186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90202216A Expired - Lifetime EP0414308B2 (fr) 1989-08-21 1990-08-16 Construction du trou de coulée d'un récipient métallurgique, sa méthode de remplacement et brique à cet effet

Country Status (5)

Country Link
EP (1) EP0414308B2 (fr)
AT (1) ATE100862T1 (fr)
DE (1) DE69006291T2 (fr)
ES (1) ES2048418T3 (fr)
NL (1) NL8902101A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208520C2 (de) * 1992-03-17 1994-10-27 Didier Werke Ag Abstichrohr an einem Konverter oder Lichtbogenofen
DE19509170A1 (de) * 1995-03-14 1996-09-19 Didier Werke Ag Abstichvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT266892B (de) * 1966-05-27 1968-12-10 Veitscher Magnesitwerke Ag Abstich für metallurgische Gefäße und Verfahren zu seiner Herstellung
US3463475A (en) * 1967-04-21 1969-08-26 Dresser Ind Taphole construction for metallurgical vessels
US3554523A (en) * 1969-01-09 1971-01-12 Edwin B Miller Taphole assembly for metallurgical furnaces
EP0249647B1 (fr) * 1986-06-18 1989-05-03 Radex West Gesellschaft mit beschränkter Haftung Burette de coulée réfractaire

Also Published As

Publication number Publication date
NL8902101A (nl) 1991-03-18
EP0414308A1 (fr) 1991-02-27
ATE100862T1 (de) 1994-02-15
DE69006291D1 (de) 1994-03-10
EP0414308B2 (fr) 1998-12-16
ES2048418T3 (es) 1994-03-16
DE69006291T2 (de) 1994-05-19

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