EP0091423B1 - Porte-vent pour un four à cuve - Google Patents

Porte-vent pour un four à cuve Download PDF

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Publication number
EP0091423B1
EP0091423B1 EP19830890039 EP83890039A EP0091423B1 EP 0091423 B1 EP0091423 B1 EP 0091423B1 EP 19830890039 EP19830890039 EP 19830890039 EP 83890039 A EP83890039 A EP 83890039A EP 0091423 B1 EP0091423 B1 EP 0091423B1
Authority
EP
European Patent Office
Prior art keywords
tuyere
wind
furnace
connection according
tip
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
Application number
EP19830890039
Other languages
German (de)
English (en)
Other versions
EP0091423A2 (fr
EP0091423A3 (en
Inventor
Paul Müllner
Max Vorderwinkler
Wilhelm Stastny
Gerhard Dr. Lazar
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.)
Voestalpine AG
Original Assignee
Voestalpine 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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0091423A2 publication Critical patent/EP0091423A2/fr
Publication of EP0091423A3 publication Critical patent/EP0091423A3/de
Application granted granted Critical
Publication of EP0091423B1 publication Critical patent/EP0091423B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/163—Blowpipe assembly

Definitions

  • the invention relates to a nozzle assembly for a shaft furnace, in particular a blast furnace, with a nozzle tip connected to a hot-wind ring line, which leads line-wise into a full-walled uncooled wind mold, preferably made of ceramic sintered mass, with a cavity in the lining for supporting the wind mold and the nozzle tip of the shaft furnace limiting cooled windform box is inserted in the shaft furnace lining.
  • a newer nozzle assembly for a blast furnace is known, for example, from Lueger, Lexikon dertechnik, Volume 5, 1963, page 147.
  • the hot wind is conducted from a ring line around the blast furnace through the nozzle blocks into the furnace.
  • Each nozzle assembly has an uncooled nozzle tip that protrudes into the cavity that is delimited by the water-cooled windshield box (also called the windshield shape).
  • the likewise water-cooled wind mold At the tip of the nozzle is the likewise water-cooled wind mold, which projects through the front opening of the wind mold box into the interior, the reaction zone, of the blast furnace.
  • the nozzle tip is made of cast hematite. Its tip is also cooled by the water-cooled wind form. The wind form is tightly inserted with an outer cone in an inner cone of the wind form box, and the nozzle tip is pressed against the wind form by means of clamping screws.
  • the wind mold is attached to the blast furnace as rigidly as the wind mold box used in the brick lining of the blast furnace.
  • the nozzle tip is provided with a refractory lining.
  • the water-cooled wind forms are the most heavily loaded fittings in the blast furnace, they are exposed to strong thermal, chemical and mechanical loads and are therefore subject to heavy wear. As a result of these loads, the cooling water circuit breaks again and again, after which it must be switched off. The wind form must then be exchanged, which means an unscheduled shutdown of the furnace.
  • double-chamber wind forms are used, as are known for example from DE-OS-2608365. These have two separate cooling circuits, u. between one in a prechamber and one in a main chamber. The antechamber cools the part of the wind form exposed inside the furnace. If the prechamber is damaged, its cooling circuit is pushed off and the wind form can continue to be operated with the main chamber still intact until the blast furnace is scheduled to come to a standstill.
  • this solution is not entirely satisfactory because of the heat removal from the hot wind.
  • two cooling circuits are very complex.
  • a wind form box is indispensable - u. between, on the one hand, because of the high weight of the blast furnace insert consisting of wind mold and wind mold box and, on the other hand, because of the simple replacement of the more or less wearing wind mold while saving an exchange of the wind mold box, which is much less wear-resistant, the task is - according to the invention - a nozzle block with a massive one To provide windform for a blast furnace, but no leakage problems or premature wear occurs at the transition to the windform box, u. between both the wind form and the wind form box.
  • the new Dü Senstock can be installed with the wind mold boxes previously used in shaft furnaces, so that an exchange of the wind mold boxes is not necessary when equipping a shaft furnace in operation with nozzle assemblies according to the invention.
  • wind form is movably supported relative to the nozzle tip by means of a ball joint and is movable relative to the wind form box by means of a further tight joint connection.
  • a compensator is used in the windform box, which is fixed to the windform box by means of a seat ring having a conical surface and which has a holding ring fixing the windform on the end, the compensator expediently having a thin-walled tapering between the seat ring and the holding ring to the windform Has conical shell part.
  • tie rods surrounding the cone jacket part are advantageously provided between the seat ring and the retaining ring to absorb forces acting in the axial direction towards the center of the furnace, the tie rods being articulated on the one hand on the retaining ring and on the other hand on the seat ring.
  • a ball joint is expediently provided between the compensator and the nozzle tip, the ball joint preferably being formed from an inner conical surface on the compensator and an outer spherical surface on the nozzle tip for easier manufacture.
  • the wind mold has a spherical surface at its outer end which is inserted into a conical recess in the nozzle tip which tapers towards the center of the furnace, the nozzle tip expediently at its end facing the furnace center by means of a spherical surface on an inner conical surface of the wind mold box is present.
  • a spacer disc which evaporates at the operating temperature of the wind mold for example a disc made of polyethylene, polybutene or nylon, is advantageously used between the outer end of the wind mold and the refractory lining of the nozzle tip, for fixing between the spacer during installation and the fireproof lining of the nozzle tip is provided with a ring nut pressing the spacer against the wind form.
  • Highly melting metal oxides and / or metal compounds such as nitrides, silicides, carbides or borides, or metal-ceramic composites (cermets) are advantageous as the material for the uncooled wind form.
  • FIG. 1 showing a section through an axis of a nozzle assembly which is used in a blast furnace according to a first embodiment
  • FIG. 2 an analog representation of a second embodiment.
  • a windform ring 3 is welded into the blast furnace shell 1, which is lined on the inside with a refractory lining 2.
  • a windform box frame 4 is screwed to this windform ring 3, which has an inner cone 5, into which a windform box 6 with an outer cone 7 is tightly inserted.
  • the wind mold box 6 has a cavity 8 through which a coolant (cooling water), which is kept in forced circulation, flows.
  • the windform box 6 has an inner cone 10, which serves to receive a compensator 11 made of high-melting metal, which is tightly inserted into this inner cone 10 with a seat ring 12 with a conical surface 13.
  • the compensator 11 is uncooled and has a very thin-walled conical jacket part 14, starting from the seat ring 12 and tapering towards the center of the furnace, which merges into a retaining ring 15 for the wind form 16.
  • the retaining ring 15 has an inwardly directed flange 17 against which the wind form 16 abuts with a collar 18.
  • the wind mold 16 is full-walled and likewise uncooled and is produced from a ceramic sintered mass which is resistant to both oxidizing and reducing conditions. It penetrates the brick lining 2 and protrudes into the furnace interior with a protrusion.
  • the nozzle tip 19 which is also uncooled, is provided with a refractory lining 20 and is pressed towards the center of the furnace by means of clamping screws (not shown). It rests with an end spherical surface 21 on the inner surface 22 of the thin-walled conical jacket part 14, u. between where this conical shell part 14 continues in the retaining ring 15 for the wind form 16.
  • a ball joint is formed by this inner surface 22 of the conical jacket part 14 and the spherical surface 21, which enables the windform 16 (together with the retaining ring 15) to move with respect to the nozzle tip 19.
  • the thin-walled conical jacket part 14 further allows the wind mold 16 to move relative to the wind mold box 6, so that the three parts, wind mold box 6, wind mold 16 and nozzle tip 19, can be moved towards one another and there are no constraints as a result Differences in temperature resulting movements can come.
  • tie rods 23 are provided on the circumference of the compensator 11, which are articulated on the one hand on the retaining ring 15 and on the other hand on the seat ring 12 which is inserted in the windform box 6 are.
  • a ring nut 24 which is screwed with an external thread into an internal thread of the holding ring 15 and which presses the wind form against the radially inwardly directed flange 17 of the holding ring 15, is used to fix the wind form 16 in the holding ring 15.
  • the uncooled wind mold 16 is always installed and removed together with the compensator 11. According to the embodiment shown, the wind mold 16 is designed to be rotationally symmetrical. If you want to direct the hot wind diagonally downwards into the interior of the furnace, a wind mold with an axis inclined with respect to the wind mold box 6 is expediently used.
  • the wind form 27 is provided at its rear end with a spherical surface 28 which is inserted into a recess 29 provided at the end of the nozzle tip 25 on the inside of the furnace.
  • This recess 29 has an inner conical surface 30 against which the spherical surface 28 of the wind form 27 bears.
  • the front opening of the nozzle tip has a slightly larger diameter than the wind form passing through it, so that the wind form can be pivoted relative to the nozzle tip about the center 31 of the spherical surface 28 arranged on the wind form 27.
  • the spherical surface 21 of the nozzle tip has the same center point 31 as the spherical surface 28 of the windform 27 in the assembled state of the nozzle assembly.
  • the double articulation of the three parts - wind mold box 6, wind mold 27 and nozzle tip 25 - is also given, so that these three parts can be moved independently of one another and can be aligned with one another depending on the temperature-related expansions.
  • the end of the nozzle tip on the inside of the furnace which is made of a high-melting metal, has an internal thread into which an annular nut 32 provided with an external thread can be screwed.
  • This ring nut clamps the wind form 27 against the nozzle tip 25, but an intermediate layer 33 made of mineral wool and a spacer 34 are provided between the ring nut 32 and the wind form 27.
  • This spacer 34 transmits the press-in forces during the assembly of the windform 27 and is made of polyethylene, polybutene or nylon, so that when the nozzle assembly is put into operation it evaporates completely or with less residue left behind. This creates a clearance between the ring nut 32 and the wind form 27, so that the wind form 27 can be properly aligned against the nozzle tip 25.
  • the wind form 27 is changed together with the nozzle tip 25, the refractory lining 20 of the nozzle tip 25 being provided only after the wind form 27 has been inserted into the nozzle tip 25 and the ring nut 32 has been tightened.
  • the material from which the wind mold 16 or 27 is made must be resistant to oxidizing and reducing conditions.
  • High-melting metal oxides and metal compounds (hard materials), such as nitrides, carbides, silicides or borides, as well as coated high-melting metals and metal-ceramic composites (cermets) are suitable for this.
  • Refractory metals, such as. B. molybdenum, tungsten, niobium, tantalum can also be used, but they must be protected from an oxidizing atmosphere by means of a coating such as MoSi 2 or WSi 2 , and from an eO / e0 2 atmosphere. Such a coating is a very dense and firmly adhering protection.
  • the advantage of the high-melting metals lies in their great mechanical strength.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Claims (11)

1. Porte-vent pour four à cuve, en particulier pour un haut fourneau, comportant une pointe de porte-vent (19, 25) qui est raccordée à une conduite annulaire de vent chaud et qui débouche, en ce qui concerne la conduite, dans une tuyère (16 ; 27) à parois pleines, non refroidies, de préférence en masse céramique frittée, étant précisé que comme appui de la tuyère (16 ; 27) et de la pointe du porte-vent (19 ; 25) est encastrée dans le revêtement (2) du four à cuve une boîte de tuyère (6) refroidie et limitant un volume creux dans le revêtement (2) du four à cuve, caractérisé en ce qu'une articulation sphérique (21, 22 ; 28, 30) donne à la tuyère (16 ; 27) une portée mobile par rapport à la pointe du porte-vent (19 ; 25) ; et en ce qu'une autre liaison articulée étanche (14, 21, 26) la rend mobile par rapport à la boîte de tuyère (6).
2. Porte-vent selon la revendication 1, caractérisé en ce que dans la boîte de tuyère (6) est inséré un compensateur (11) qui est fixé contre la boîte de tuyère (6) au moyen d'une bague de positionnement (12) présentant une surface conique (13) et qui présente, côté frontal, une bague support (15) fixant la tuyère (6).
3. Porte-vent selon la revendication 1 et 2, caractérisé en ce que le compensateur (11) présente, entre sa bague de positionnement (12) et la bague support (15), une portion périphérique conique (14) à paroi mince et allant en se rétrécissant en direction de la tuyère (6).
4. Porte-vent selon la revendication 3, caractérisé en ce qu'entre la bague de positionnement (12) et la bague support (15) sont prévus pour reprendre les forces agissant axialement dans la direction du centre du four, des tirants (23) entourant la portion périphérique conique (14), étant précisé que les tirants (23) sont articulés d'une part à la bague support (15) et d'autre part à la bague de positionnement (12).
5. Porte-vent selon l'une des revendications 2 à 4, caractérisé en ce qu'entre le compensateur (11) et la pointe du porte-vent (19) est prévue une articulation sphérique (21, 22).
6. Porte-vent selon la revendication 5, caractérisé en ce que l'articulation sphérique est constituée d'une surface conique intérieure (22) sur le compensateur (11) et d'une surface sphérique extérieure (21) sur la pointe du porte-vent (19).
7. Porte-vent selon la revendication 1, caractérisé en ce que la tuyère (27) présente, à son extrémité ouverte côté extérieur, une surface sphérique (28) insérée dans un logement, de forme conique et allant en se rétrécissant en direction du centre du four, de la pointe du porte-vent (25).
8. Porte-vent selon les revendications 1 et 7, caractérisé en ce que la pointe du porte-vent (25), à son extrémité dirigée vers le centre du four, s'appuie, au moyen d'une surface sphérique (21), contre une surface conique intérieure (26) de la boîte de la tuyère (6).
9. Porte-vent selon les revendications 1, 7 et 8, caractérisé en ce qu'entre l'extrémité, ouverte côté extérieur, de la tuyère (27) et le revêtement réfractaire (20) de la pointe du porte-vent (25) est insérée une bague d'écartement (34) qui se volatilise à la température d'exploitation de la tuyère, par exemple une bague en polyéthylène, en poly- butène, ou en nylon.
10. Porte-vent selon la revendication 9, caractérisé en ce qu'entre la bague d'écartement (34) et le revêtement réfractaire (20) de la pointe du porte-vent (25) est prévue une bague filetée extérieurement (32) qui appuie la bague d'écartement (34) contre la tuyère (27).
11. Porte-vent selon l'une des revendications 1 à 10, caractérisé en ce que la tuyère (16 ; 27) est fabriquée en oxydes métalliques à point de fusion très élevé et/ou en combinaisons métalliques (matériaux durs) comme des nitrures, des carbures, des siliciures ou des borures ou des matériaux composites métallo-céramiques (Cermets).
EP19830890039 1982-04-05 1983-03-17 Porte-vent pour un four à cuve Expired EP0091423B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT134382A AT373283B (de) 1982-04-05 1982-04-05 Duesenstock fuer einen schachtofen
AT1343/82 1982-04-05

Publications (3)

Publication Number Publication Date
EP0091423A2 EP0091423A2 (fr) 1983-10-12
EP0091423A3 EP0091423A3 (en) 1984-07-04
EP0091423B1 true EP0091423B1 (fr) 1986-05-07

Family

ID=3511848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830890039 Expired EP0091423B1 (fr) 1982-04-05 1983-03-17 Porte-vent pour un four à cuve

Country Status (3)

Country Link
EP (1) EP0091423B1 (fr)
AT (1) AT373283B (fr)
DE (1) DE3363362D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007122A1 (de) * 2010-02-05 2011-08-11 SAB S.àr.l. Düsenstock
EP4217675A1 (fr) * 2020-09-28 2023-08-02 Paul Wurth S.A. Buse refroidie échangeable avec passage d'injecteur en céramique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234936C1 (de) * 1992-10-16 1993-10-28 Gutehoffnungshuette Man Windformhalterung im Schachtofenpanzer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT7050B (fr) * 1901-03-01 1902-03-10 Ind De La Magnesite Sa
US1849718A (en) * 1928-07-05 1932-03-15 Roy H Ledbetter Blast furnace tuyere
DE650859C (de) * 1934-06-02 1937-10-02 Meutsch Ausstroemduese, insbesondere Windduese fuer Schachtoefen
BE748835A (fr) * 1970-04-10 1970-10-12 Centre Rech Metallurgique Perfectionnements aux tuyeres de soufflage,
FR2239654B1 (fr) * 1973-07-30 1977-06-17 Wurth Anciens Ets Paul

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007122A1 (de) * 2010-02-05 2011-08-11 SAB S.àr.l. Düsenstock
EP4217675A1 (fr) * 2020-09-28 2023-08-02 Paul Wurth S.A. Buse refroidie échangeable avec passage d'injecteur en céramique

Also Published As

Publication number Publication date
ATA134382A (de) 1983-05-15
EP0091423A2 (fr) 1983-10-12
EP0091423A3 (en) 1984-07-04
AT373283B (de) 1984-01-10
DE3363362D1 (en) 1986-06-12

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