EP0358115B1 - Zweigeteilter Endstein - Google Patents

Zweigeteilter Endstein Download PDF

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Publication number
EP0358115B1
EP0358115B1 EP89116118A EP89116118A EP0358115B1 EP 0358115 B1 EP0358115 B1 EP 0358115B1 EP 89116118 A EP89116118 A EP 89116118A EP 89116118 A EP89116118 A EP 89116118A EP 0358115 B1 EP0358115 B1 EP 0358115B1
Authority
EP
European Patent Office
Prior art keywords
cylindrical body
terminal brick
section
terminal
brick according
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
EP89116118A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0358115A2 (de
EP0358115A3 (en
Inventor
Sabine Dipl.-Ing. Altpeter
Bernd Dipl.-Ing. Dr. Grabner
Helmut Dipl.-Ing. Vacek
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.)
RHI AG
Original Assignee
Radex Heraklith Industriebeteiligungs 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 Radex Heraklith Industriebeteiligungs AG filed Critical Radex Heraklith Industriebeteiligungs AG
Priority to AT89116118T priority Critical patent/ATE81359T1/de
Publication of EP0358115A2 publication Critical patent/EP0358115A2/de
Publication of EP0358115A3 publication Critical patent/EP0358115A3/de
Application granted granted Critical
Publication of EP0358115B1 publication Critical patent/EP0358115B1/de
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
    • 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
    • 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
    • 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; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for 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
    • F27D1/14—Supports for linings
    • F27D1/145—Assembling elements
    • 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

Definitions

  • the invention relates to a refractory ceramic end stone for use as an outlet-side end section of a tapping system, in particular on steel converters or electric furnaces, comprising a plurality of refractory ceramic shaped stones arranged one behind the other, which together enclose a through opening for the molten steel.
  • Tapping systems of this type are known both in converters, for example LD converters or floor-piercing electric furnaces, but also in non-ferrous metal units, for example from AT-PS 326 164 or EP-OS 171 658.
  • the individual shaped stones of the tapping often have a cylindrical shape, but can also be designed differently be and are often connected to each other via tongue and groove connections for reasons of simplification of assembly and formation of a cylindrical through-channel for the molten metal.
  • a closure plate is often provided at the outlet end of the tapping system and, before the melting unit is filled, loose, dry, refractory granules are poured into the passage and secured against leakage by the metal plate on the bottom.
  • the plate not only prevents the granules from flowing downwards, but also absorbs the static pressure of the molten metal later on.
  • the plate is simply moved sideways or rotated. As soon as the granulate has run out, the molten metal follows the path through the rack, for example into a pan.
  • a pouring sleeve which is extended downwards (in the flow direction of the melt) by a second, multi-part pouring sleeve.
  • the individual sections of the lower sleeve are each assembled in metal frames and connected to one another on the frame.
  • the invention now aims to show a way in which the durability of tapping systems of the type mentioned can be increased.
  • An essential feature of the invention consists first of all in dividing the end stone into two Sections. This subdivision is carried out so that the lower section covers the area that is particularly at risk from the erosions mentioned. As a rule, this will only be a small end section.
  • the cylindrical body should have a lower height than the upper section and the shape of a round disk with a flow opening.
  • this lower section is detachable (interchangeable) in such a way that it can be removed downwards (as seen in the flow direction of the melt) without the upper section of the end stone and the shaped stones arranged above it being broken or otherwise would have to be dismantled.
  • the major part of the racking can be used immediately for further batches and only the last lower end section is repaired or exchanged for a new one.
  • the repair effort and the repair time compared to known repair methods is greatly reduced, since only the replacement of the bottom end section, which is easily accessible from the outside, is necessary, which nevertheless lies in a common steel frame with the upper section of the end block.
  • At least the end stone is held circumferentially in a corresponding steel frame, as is also evident from EP-OS 171 658.
  • one of the lower cylindrical bodies (the disk) is attached to the corresponding lower end of the steel frame
  • the cylindrical body has a metal sleeve on the circumference, which has corresponding locking means for fastening to the steel frame.
  • these locking means can consist of an external thread, preferably a cord thread expressed from the metal sleeve, by means of which the cylindrical body is releasably fixed in relation to a corresponding internal thread in the area of the steel frame.
  • the cylindrical body is then practically screwed into the steel frame until its upper end face abuts the lower end face of the upper end section. It is also possible to fasten the cylindrical body with the help of wedges which are hammered in from below between the body and the steel frame.
  • an elastic intermediate layer can be placed on the upper end face of the cylindrical section, for example a fire-resistant ceramic fiber mat (which of course also has a central passage opening) and which is then pressed together between the lower and upper end stone section.
  • a fire-resistant ceramic fiber mat which of course also has a central passage opening
  • the end stone section above shows signs of erosion, it can now be repaired using a known repair compound, for example, using the new end plate as a template.
  • At least two, preferably three or more radially projecting pins are attached to the outer circumferential surface of the metal sleeve.
  • the corresponding section of the steel frame then has corresponding receiving slots which have an opening width equal to or slightly larger than the diameter of the pins and the cylindrical body is then inserted with its radially projecting pins into the receiving slots and fixed there.
  • the receiving slots are preferably designed such that they extend upwards from the lower end face of the steel frame in a curved path and then merge into a largely horizontal section. It is a bayonet type closure.
  • the metal sleeve can be shrunk onto the ceramic body, but the ceramic cylindrical section can also be glued or inserted into the sleeve, preferably using a suitable mortar.
  • the steel sleeve is drawn around the underside of the cylindrical body and engages under the body on a partial surface.
  • the lower part of the sleeve protrudes over the lower end face of the ceramic body, so that a cylindrical cavity is formed here after the bottom cover plate of the tapping system has been closed.
  • This cavity can be filled in that, for example, a fireproof ceramic mat corresponding in its dimensions to the cavity is arranged on the cover plate, which also prevents the granules from trickling out (as described above).
  • cylindrical body can also be extended downward on its lower part, which is not covered by the metal sleeve, so that the lower end face of the lower end block section is then flush with the lower end face of the sleeve.
  • the lower and upper end section can be made of the same materials.
  • the lower section which is particularly at risk of erosion, is preferably made of a material which has a higher stability against erosions than the material of the upper section.
  • the lower disc can be an isostatically pressed part.
  • the design of a final stone according to the invention also enables simultaneous inert gas flushing in a particularly advantageous manner.
  • Corresponding essentially radially extending through channels can be arranged in the ceramic lower section, which are connected to one another on the outside via a common ring channel which has a connection area via which an inert gas line is connected.
  • a corresponding opening for the gas supply line is then provided in the steel frame and the gas connection is arranged in the cylindrical body in such a way that, after the lower section has been fixed on the upper section of the end stone, it lies directly in front of the opening in the steel frame and the gas line can thus be connected directly .
  • the gas supply channels do not run exactly radially, but between a radial and tangential assignment to the inner circumferential surface of the through opening, as a result of which a circulating flow of the inert gas, for example argon, can be set.
  • the arrangement of the channels in the region of the upper end face of the lower section is preferred.
  • the lower section of the end stone 10 of a tapping system is shown.
  • the end block 10 consists of an upper section 12 and a lower section 14.
  • the end block 10 is seated in a steel frame 16.
  • the upper section 12 of the end stone 10 has a substantially cylindrical shape and is conically somewhat tapered in its lower part at 18 and lies there on a corresponding, inclined step 20 of the steel frame 16.
  • the upper section 12 has a central, cylindrical through opening 22.
  • a cylindrical part 24 of the steel frame 16 adjoins the step 20 which slopes inwards.
  • the lower section 14 of the end stone 10 lies in this cylindrical part 24.
  • the lower section 14 also has the shape of a cylindrical section with a through opening 26 corresponding to the through opening 22 and consists of a refractory ceramic body 14a, which lies over a refractory mortar in a metal sleeve 28 which surrounds the ceramic body 14a on the circumferential and underside in the edge region borders.
  • the ceramic body 14a is extended downward in the area not covered by the metal sleeve 28 (FIG. 14b).
  • the metal sleeve 28 has on the circumference three metal pins 30 which are arranged at an angle of 120 degrees to one another and which are welded to the metal sleeve 28.
  • the pins 30 lie in corresponding receiving slots 32 which are formed on the inside in the steel frame 16.
  • the receiving slots 32 initially run axially upward from the lower end face 34 (36a), then merge into a curved section 36b and finally end in a parallel to the lower end face 34 arranged end portion 36c.
  • the lower section 14 When the lower section 14 is assembled, it is thus guided with the pins 30 along the receiving slots in a rotating movement in the direction of the upper section 12 until the pins 30 abut against the rear end face of the receiving slots 32.
  • the assembly can be carried out by means of a tool, and corresponding anchoring holes can be provided in the lower end face of the metal sleeve.
  • the dimensioning of the lower section 14, the pins 30 and the receiving slots 32 is chosen so that the lower section 14, at the moment when the pins 30 abut or shortly before the rear end of the receiving slots 32, directly and sealingly against the upper one Section 12 of the end stone 10 is present.
  • a thin elastic intermediate layer can be arranged between the lower section 14 and the upper section 12, for example a refractory ceramic fiber fleece.
  • the lower section 14 can easily be unscrewed from the outside in the opposite way to that during assembly and replaced by a new section 14.
  • the racking system is then immediately available for further castings.
  • the embodiment according to FIG. 2 corresponds with one exception to that according to FIG. 1.
  • the difference is that the lower section 14 is designed as a disk of constant height, so that between the lower end face 40 of the cylindrical body 14 and the lower end face 42 of the metal sleeve 28 a cylindrical cavity 44 is formed.
  • an elastic, fireproof ceramic fiber mat is preferably placed on the lower metal cover (not shown) of the tapping system upset that in their Dimensions corresponds to the cavity 44 and fills it accordingly, as long as the metal cover is in the closed position.
  • FIG. 3 finally corresponds to that according to FIG. 2 with a further exception.
  • a plurality of channels 48 extend from the upper end face 46 of the cylindrical section 14 into the refractory material and these channels have an orientation which lies between a radial and a tangential position with respect to the inner wall 50 of the through opening 26, like the lower part of FIG Figure 3 shows easily.
  • the channels 48 open with their inner end in the through opening 26 and with their outer end in a circumferential annular channel 52, which has at 54 a connecting piece 56 which extends through the metal sleeve 28 and is in a position which is determined by the lower Section 14 is opposite the upper section 12 of the end block 10 directly opposite a radial opening 58 in the steel frame 16, so that at this point a gas supply line 60 can be carried out through the opening 58 and placed on the connecting piece 56.
  • later operation i.e.
  • an inert gas such as argon
  • argon is flushed in via the gas supply line 60, which is then injected into the through-opening 26 via the ring channel 52 and the channels 48 in order to avoid oxidation of the Molten metal.
  • an additional ring channel can be provided for injecting the inert gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Inorganic Insulating Materials (AREA)
  • Materials For Medical Uses (AREA)
  • Dental Preparations (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP89116118A 1988-09-07 1989-08-31 Zweigeteilter Endstein Expired - Lifetime EP0358115B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116118T ATE81359T1 (de) 1988-09-07 1989-08-31 Zweigeteilter endstein.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3830342 1988-09-07
DE3830342A DE3830342A1 (de) 1988-09-07 1988-09-07 Zweigeteilter endstein

Publications (3)

Publication Number Publication Date
EP0358115A2 EP0358115A2 (de) 1990-03-14
EP0358115A3 EP0358115A3 (en) 1990-05-16
EP0358115B1 true EP0358115B1 (de) 1992-10-07

Family

ID=6362421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116118A Expired - Lifetime EP0358115B1 (de) 1988-09-07 1989-08-31 Zweigeteilter Endstein

Country Status (4)

Country Link
US (1) US5060915A (enrdf_load_stackoverflow)
EP (1) EP0358115B1 (enrdf_load_stackoverflow)
AT (1) ATE81359T1 (enrdf_load_stackoverflow)
DE (2) DE3830342A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2681610B1 (fr) * 1991-09-20 1993-11-19 Boulonnais Terres Refractaires Blocs siphons pre-moules composites pour routes de coulee de hauts fourneaux.
US5401004A (en) * 1993-03-03 1995-03-28 Bethlehem Steel Corporation Method and apparatus for installing a nozzle insert in a steelmaking ladle
US5335896A (en) * 1993-03-03 1994-08-09 Bethlehem Steel Corporation Nozzle insert for a steelmaking ladle
AT514499B1 (de) * 2013-07-04 2015-06-15 Dieter Dipl Ing Mühlböck Abstichrohr

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU58588A1 (enrdf_load_stackoverflow) * 1968-05-22 1969-08-22
EP0249647A1 (de) * 1986-06-18 1987-12-23 Radex West Gesellschaft mit beschränkter Haftung Feuerfester Ausguss

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB321106A (en) * 1928-12-24 1929-10-31 Kenneth Royston Binks Improvements in and relating to liquid metal casting ladles
GB549212A (en) * 1941-05-07 1942-11-11 Samuel Fox And Company Ltd An improved nozzle for use in teeming molten metal
US3396961A (en) * 1965-08-09 1968-08-13 Gen Refractories Co Precast taphole assembly
DE2733665C2 (de) * 1977-07-26 1985-10-24 Didier-Werke Ag, 6200 Wiesbaden Auswechselbare Verschleißteile für Schiebeverschlüsse
DE2918333A1 (de) * 1979-05-07 1980-11-20 Metacon Ag Metallurgischer ofen
DE3041029A1 (de) * 1980-10-31 1982-06-16 Zimmermann & Jansen GmbH, 5160 Düren Bodenverschluss fuer einen schmelzofen, insbesondere einen lichtbogenschmelzofen
AT387039B (de) * 1981-02-05 1988-11-25 Veitscher Magnesitwerke Ag Abstichvorrichtung fuer konverter
DE8422585U1 (de) * 1984-07-28 1984-12-20 Korf-BSW Engineering GmbH, 7640 Kehl Vorrichtung zum bodenabstich einer metallschmelze aus einem schmelzofen oder einer giesspfanne
US4756452A (en) * 1986-11-13 1988-07-12 Shinagawa Refractories Co., Ltd. Molten metal pouring nozzle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU58588A1 (enrdf_load_stackoverflow) * 1968-05-22 1969-08-22
EP0249647A1 (de) * 1986-06-18 1987-12-23 Radex West Gesellschaft mit beschränkter Haftung Feuerfester Ausguss

Also Published As

Publication number Publication date
EP0358115A2 (de) 1990-03-14
US5060915A (en) 1991-10-29
DE3830342A1 (de) 1990-03-15
ATE81359T1 (de) 1992-10-15
DE58902411D1 (de) 1992-11-12
DE3830342C2 (enrdf_load_stackoverflow) 1990-09-13
EP0358115A3 (en) 1990-05-16

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