EP0091422A2 - Porte-vent pour un four à cuve - Google Patents

Porte-vent pour un four à cuve Download PDF

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Publication number
EP0091422A2
EP0091422A2 EP83890038A EP83890038A EP0091422A2 EP 0091422 A2 EP0091422 A2 EP 0091422A2 EP 83890038 A EP83890038 A EP 83890038A EP 83890038 A EP83890038 A EP 83890038A EP 0091422 A2 EP0091422 A2 EP 0091422A2
Authority
EP
European Patent Office
Prior art keywords
wind
shaft furnace
nozzle tip
box
nozzle
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
EP83890038A
Other languages
German (de)
English (en)
Other versions
EP0091422A3 (en
EP0091422B1 (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 EP0091422A2 publication Critical patent/EP0091422A2/fr
Publication of EP0091422A3 publication Critical patent/EP0091422A3/de
Application granted granted Critical
Publication of EP0091422B1 publication Critical patent/EP0091422B1/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 windform formed from full-walled, uncooled, high-temperature-resistant material, with a cavity in the for direct support of the wind form and thus the nozzle tip
  • the windform box limiting the lining of the shaft furnace is inserted into the shaft furnace.
  • Nozzle sticks of a more recent design for a blast furnace are 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 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 nozzle tip For hot wind temperatures up to around 800 ° C, the nozzle tip is made of cast hematite. Its tip is also cooled by the water-cooled wind form. For higher hot wind temperatures up to about 1400 ° C, as they occur in modern large-scale blast furnaces, 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 per type of wind are very complex.
  • the task according to the invention is to create a nozzle block with a solid wind form for one Provide blast furnace, but no leakage problems or none at the transition to the windform box premature wear occurs, etc. both on the wind form and on the wind form box.
  • wind mold box is formed from full-walled, uncooled, high-temperature-resistant materials, in particular from ceramic sintered mass.
  • Highly melting metal oxides and / or metal compounds such as nitrides, carbides, silicides or borides, or metal-ceramic composites (cermets) are advantageous as materials for the uncooled wind mold and the uncooled wind mold box.
  • the part of the articulated connection provided on the nozzle tip is connected to a compressed air supply and discharge line.
  • 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.
  • the wind mold box 6 has an inner cone 9, into which the wind mold 10 with an outer cone 11 is inserted.
  • the wind mold 10 and the wind mold box 6 are full-walled and uncooled and made from a ceramic sintered mass which is resistant to both oxidizing and reducing conditions.
  • the wind form 10 passes through the brick lining 2 and projects into the furnace interior 13 with a protrusion 12.
  • the nozzle tip 14 which is also uncooled, is provided with a refractory lining 15 and is pressed towards the center of the furnace by means of clamping screws (not shown). It rests with a front spherical surface 16, which is provided on the shell 17 of the nozzle tip 14 made of high-melting metal, against a conical surface 18 of the wind form. A ball joint is formed by this spherical surface 16 and conical surface 18, which enables the nozzle tip 14 to move with respect to the wind mold 10 and also with respect to the wind mold box 6.
  • the front end portion is provided 19 of the nozzle tip 14 with a spiral-shaped cavity 20 reßluftzu- to a P and outlet is connected to 21 and 22, so that the front end portion 19 of the nozzle tip 14 before Overheating can be protected.
  • a wind mold 10 with an axis 23 inclined to the wind mold box 6 is used in order to blow the hot wind obliquely downwards into the blast furnace.
  • the axis 24 of the nozzle tip is also inclined with respect to the axis 25 of the windform box.
  • High-melting metal oxides and metal compounds such as nitrides, carbides, silicides or borides, as well as coated high-melting metals and metal-ceramic composites (cermets) are suitable as materials for the wind mold 10 and the wind mold box 6.
  • Refractory metals such as molybdenum, W ungsten, niobium, tantalum, may also be used, but they must before an oxidizing atmosphere by means of a coating such as MoSi 2 or WSi 2, and are protected from a CO / C0 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)
  • Ceramic Products (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP19830890038 1982-04-05 1983-03-17 Porte-vent pour un four à cuve Expired EP0091422B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT134482A AT373284B (de) 1982-04-05 1982-04-05 Duesenstock fuer einen schachtofen
AT1344/82 1982-04-05

Publications (3)

Publication Number Publication Date
EP0091422A2 true EP0091422A2 (fr) 1983-10-12
EP0091422A3 EP0091422A3 (en) 1984-07-04
EP0091422B1 EP0091422B1 (fr) 1986-05-07

Family

ID=3511868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830890038 Expired EP0091422B1 (fr) 1982-04-05 1983-03-17 Porte-vent pour un four à cuve

Country Status (3)

Country Link
EP (1) EP0091422B1 (fr)
AT (1) AT373284B (fr)
DE (1) DE3363361D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742995A (en) * 1985-02-15 1988-05-10 Injectall Limited Apparatus for introducing treatment substances into liquids

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR1438459A (fr) * 1965-03-22 1966-05-13 Soudure Et De Rechargement Mec Perfectionnements aux tuyères et accessoires de soufflage pour hauts fourneaux et analogues
FR2239654B1 (fr) * 1973-07-30 1977-06-17 Wurth Anciens Ets Paul

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742995A (en) * 1985-02-15 1988-05-10 Injectall Limited Apparatus for introducing treatment substances into liquids

Also Published As

Publication number Publication date
EP0091422A3 (en) 1984-07-04
DE3363361D1 (en) 1986-06-12
ATA134482A (de) 1983-05-15
AT373284B (de) 1984-01-10
EP0091422B1 (fr) 1986-05-07

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