EP0091423A2 - Porte-vent pour un four à cuve - Google Patents

Porte-vent pour un four à cuve Download PDF

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Publication number
EP0091423A2
EP0091423A2 EP83890039A EP83890039A EP0091423A2 EP 0091423 A2 EP0091423 A2 EP 0091423A2 EP 83890039 A EP83890039 A EP 83890039A EP 83890039 A EP83890039 A EP 83890039A EP 0091423 A2 EP0091423 A2 EP 0091423A2
Authority
EP
European Patent Office
Prior art keywords
wind
nozzle tip
furnace
nozzle
assembly 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.)
Granted
Application number
EP83890039A
Other languages
German (de)
English (en)
Other versions
EP0091423A3 (en
EP0091423B1 (fr
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 wind form box is inserted in the shaft furnace lining.
  • a new type of 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 form is attached to the nozzle tip and protrudes through the front opening of the wind form 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 shape is the same in this case rigidly attached to the blast furnace like the wind form box used in the 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.
  • D ouble chamber wind forms are used, as they are known, for example, from DE-OS 26 08 365th These have two separate cooling circuits, e.g. 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 pre-chamber is damaged, its cooling circuit is shunted 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. However, this solution is not entirely satisfactory because of the heat removal from the hot wind. In addition, two cooling circuits are very complex.
  • the task according to the invention is to provide a nozzle block with a solid wind mold for a blast furnace, but there are no sealing problems or no premature wear at the transition to the wind mold box, etc. both on the wind form and on the wind form box.
  • the new nozzle assembly should be able to be installed while leaving the windform boxes previously used in shaft furnaces, so that an exchange of the windform boxes is not necessary when equipping an operating shaft furnace with nozzle assemblies according to the invention.
  • this object is achieved in that the 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.
  • the temperature change between the cooled windshield box and the windshield as well as between the cooled windshield box and the nozzle tip results in changes in the position of the windshield or the nozzle tip caused by the double articulation - on the one hand, it is the wind shape compared to the wind shape box and, on the other hand, the shape of the wind relative to the nozzle tip and the tip of the nozzle movable relative to the wind form box - can be compensated.
  • 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 conical 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 refractory 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 1, which is lined on the inside with a refractory lining 2.
  • a wind mold box frame 4 is screwed onto this windform ring 3, which has an inner cone 5, into which a wind mold 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 accommodate 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 interior of the furnace 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, etc. where this conical jacket part 1'4 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 also 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 relative to one another and there can be no constraints as a result of movements resulting from temperature differences.
  • tie rods 23 are provided on the circumference of the compensator 11 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.
  • An annular nut 24 is used to fix the windshield 16 in the retaining ring 15, which is screwed with an external thread into an internal thread of the retaining ring 15 and which presses the windshield against the radially inwardly directed flange 17 of the retaining 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 somewhat 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 when the nozzle assembly is assembled.
  • 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 inside of the end of the nozzle tip 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 windform 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 windform 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 have oxidizing and reducing conditions to be resistant to.
  • 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 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 a CO / CO 2 atmosphere.
  • a coating is a very dense and firmly adhering protection.
  • the advantage of the high-melting metals lies in their great mechanical strength.

Landscapes

  • 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)
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 true EP0091423A2 (fr) 1983-10-12
EP0091423A3 EP0091423A3 (en) 1984-07-04
EP0091423B1 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)

Families Citing this family (3)

* 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
DE102010007122A1 (de) * 2010-02-05 2011-08-11 SAB S.àr.l. Düsenstock
LU102096B1 (en) * 2020-09-28 2022-03-29 Wurth Paul Sa Exchangeable cooled nose with ceramic injector passage

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

Also Published As

Publication number Publication date
ATA134382A (de) 1983-05-15
EP0091423A3 (en) 1984-07-04
AT373283B (de) 1984-01-10
EP0091423B1 (fr) 1986-05-07
DE3363362D1 (en) 1986-06-12

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