EP3290532B1 - Convertisseur avec un bouchon de soufflage par le fond à maniabilité améliorée - Google Patents

Convertisseur avec un bouchon de soufflage par le fond à maniabilité améliorée Download PDF

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Publication number
EP3290532B1
EP3290532B1 EP15910651.7A EP15910651A EP3290532B1 EP 3290532 B1 EP3290532 B1 EP 3290532B1 EP 15910651 A EP15910651 A EP 15910651A EP 3290532 B1 EP3290532 B1 EP 3290532B1
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EP
European Patent Office
Prior art keywords
furnace
gas
plug
converter furnace
folding
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.)
Active
Application number
EP15910651.7A
Other languages
German (de)
English (en)
Other versions
EP3290532A4 (fr
EP3290532A1 (fr
Inventor
Kunihiro Koide
Tomohiro Tsuda
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.)
TYK Corp
Original Assignee
TYK Corp
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Publication date
Application filed by TYK Corp filed Critical TYK Corp
Publication of EP3290532A1 publication Critical patent/EP3290532A1/fr
Publication of EP3290532A4 publication Critical patent/EP3290532A4/fr
Application granted granted Critical
Publication of EP3290532B1 publication Critical patent/EP3290532B1/fr
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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
    • C21C5/48—Bottoms or tuyéres of converters
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • 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
    • F27B3/22—Arrangements of air or gas supply devices
    • 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
    • F27D27/00—Stirring devices for molten material
    • 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
    • F27D3/16—Introducing a fluid jet or current into the charge
    • 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
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/161—Introducing a fluid jet or current into the charge through a porous element
    • 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
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/167—Introducing a fluid jet or current into the charge the fluid being a neutral gas
    • 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
    • F27D27/00—Stirring devices for molten material
    • F27D2027/002—Gas stirring

Definitions

  • the present invention relates to a converter furnace. Specifically, it relates to a converter furnace comprising a bottom-blowing plug that is aimed at injecting a gas into a metallic molten metal in the converter furnace.
  • the bottom portion of a converter furnace makes such a rough or simplified structure as illustrated in a vertical end-face diagram shown in Fig. 4 .
  • 10 designates an iron cladding of the bottom part of a furnace
  • 20 designates a tuyere for injecting a gas.
  • a permanent brick 9 is lined on the iron cladding 10 of the furnace-bottom part, and then a working brick 5 is laminated on this permanent brick 9.
  • the above-mentioned working brick 5 is available in such an instance that it makes a double-layer lining by a lower-layer brick 5b and an upper-layer brick 5a, as shown in Fig.
  • Patent Literature No. 2 discloses a converter furnace comprising a metal shell including a tuyere, a furnace-bottom refractory disposed inside the metal shell, and an injector for spouting oxygen gas to a metallic molten metal within the furnace.
  • the injector has one end thereof inserted in the tuyere, which is held by a refractory ramming mixture disposed in the furnace-bottom refractory.
  • the other end of the injector is provided with a bent coupling piece that is connected to a flexible hose.
  • Patent Literature No. 3 discloses a converter furnace as specified in the preamble of the claim. Other converter furnaces are known from Patent Literature Nos. 4 and 5.
  • a refractory brick for converter furnace Since a refractory brick for converter furnace is exposed to high-temperature molten metals to be corroded, it needs to undergo relining regularly.
  • relining the converter-furnace bricks it has been carried out to line bricks in the vertical direction and horizontal direction from a predetermined positon in the iron cladding; or, in a certain case, they are lined concentrically about the predetermined position serving as the center.
  • the bottom-blowing plug is built in at a location, which is close to a position disposed, depending on the lining order of the refractory bricks, in the iron cladding, to let a gas supply conduit of the bottom-blowing plug pass through it.
  • the refractory bricks are exchanged for the other refractory bricks, or operations are done to adjust the position of the bottom-blowing plugs by scraping or grinding off some of the refractory bricks.
  • Such operations require a considerable time, so that such another inconvenience might possibly arise that the time for maintaining or repairing a converter furnace has become longer.
  • the present invention has been made in view of the above-mentioned problems. Hence, it is an assignment to the present invention to provide a converter furnace, which is tolerant towards errors occurring at the time of lining the furnace-bottom refractory.
  • a converter furnace according to the present invention which is made to solve the assignment, comprises the features specified in the claim.
  • the bending/folding-free conduit needs to exhibit heat resistance, pressure resistance, and airtightness.
  • a bottom-blowing plug that is disposed in a furnace-bottom refractory for the bottom of a converter furnace, will be described concretely with reference to Figs. 1 and 2 .
  • a bottom-blowing plug As illustrated in Fig. 1 , a bottom-blowing plug according to the embodiment is constituted of a plug body 1 provided with multiple through bores 11, and a bending/folding-free conduit 2 installed to a downside of the plug body 1.
  • the plug body 1 is formed as a trapezoidal shape whose upper side is made smaller and lower side is made larger in the vertical cross section, and comprises a flat upper face 13, which faces opposite to a molten metal in the converter furnace, a lower face 12, and an outer peripheral face 14.
  • the outer peripheral face 14 of the plug body 1 includes two flat faces 14a, and curved faces (14b, 14c).
  • the curved face 14b makes an arc of a circle whose center is a furnace-core center "O" of the converter furnace and which has a radius "R 0 ,” whereas the curved face 14c makes an arc of another circle whose center is the furnace-core center "O” and which has a radius "R 1 " (> "R 0 ").
  • a base 3, which forms a gas chamber 31, is attached onto the lower face 12 of the plug body 1.
  • the gas chamber 31, to which the lower portion of the through bores 11 opens, is disposed in the downside of the plug body 1, and the bending/folding-free conduit 2 communicates with the gas chamber 31.
  • a long-service-life or highly-durable magnesia/carbonaceous material is desirable.
  • the through bores 11 have a horizontal cross-sectional configuration formed as a circular shape, and are additionally disposed to elongate along the axial center line of the plug body 1. Moreover, the respective bores 11 open not only in the top face 13 of the plug body 11 but also in the bottom face 12, and accordingly make it possible to inject a gas into a molten metal.
  • 90 pieces of the through bores 11 are arranged at equal intervals on 5 pieces of imaginary concentric regular hexagons.
  • the gas chamber 31 is formed by plugging the cylinder-shaped base 3 at the downside with a disk 4.
  • An installation port 41 which is arranged concentrically with the plug body 1, is disposed fixedly onto the disk 4 at the center. Note that 5 designates a metallic disk coming in contact with the lower face 12 of the plug body 1.
  • the bending/folding-free conduit 2 which is made of metal, comprises a thin-thickness pipe 21, and a member 22 wound spirally around the pipe 21 on the outer periphery; and excels in the heat resistance, pressure resistance and airtightness.
  • the spirally-wound member 22 operates to retain a circular cross section even when the thin-thickness pipe 21 bends.
  • the bending/folding-free conduit 2 can also be a flexible hose 2A shown in Fig. 3 .
  • the flexible hose 2A is made by covering the outer periphery of a core tube 2A 1 , which is made of stainless steel, with an over braid 2A 2 , which is made of stainless steel.
  • 2A 3 designates an end connection made of stainless steel.
  • the core tube 2A 1 is a kind of bellows
  • the over braid 2A 2 is a fabric made of stainless-steel wire.
  • the gas supply conduit 2 which communicates with the gas chamber 31 includes a bending/folding-free conduit, some of it can also include the bending/folding-free conduit partially.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (1)

  1. Four convertisseur (7) comprenant : un chemisage en fer (10) dont le fond de four inclut une tuyère (20) ; un réfractaire de fond de four (6) disposé à l'intérieur du chemisage en fer (10) ; et un bouchon de soufflage par le fond pour faire jaillir un gaz sur un métal fondu métallique à l'intérieur du four (7),
    le bouchon de soufflage par le fond incluant :
    un corps de bouchon (1) disposé dans le réfractaire de fond de four (6) et ayant : une face supérieure (13) orientée à l'opposé du métal fondu métallique, une face inférieure (12) positionnée dos à dos avec la face supérieure (13), et des alésages traversants (11) s'ouvrant respectivement dans la face supérieure (13) et la face inférieure (12) pour faire jaillir le gaz dans le métal fondu métallique ; et
    un conduit d'alimentation en gaz installé sur un côté inférieur du corps de bouchon (1) pour alimenter avec le gaz les alésages traversants (11),
    dans lequel tout ou partie du conduit d'alimentation en gaz inclut un conduit sans courbure/pliage,
    caractérisé en ce que
    le conduit sans courbure/pliage comprend un tuyau d'épaisseur mince (21) et un élément (22) enroulé en spirale autour du tuyau d'épaisseur mince (21) sur la périphérie externe.
EP15910651.7A 2015-12-17 2015-12-17 Convertisseur avec un bouchon de soufflage par le fond à maniabilité améliorée Active EP3290532B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2015/006284 WO2017103959A1 (fr) 2015-12-17 2015-12-17 Bouchon de soufflage par le fond à maniabilité améliorée

Publications (3)

Publication Number Publication Date
EP3290532A1 EP3290532A1 (fr) 2018-03-07
EP3290532A4 EP3290532A4 (fr) 2018-05-23
EP3290532B1 true EP3290532B1 (fr) 2020-05-06

Family

ID=59056488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15910651.7A Active EP3290532B1 (fr) 2015-12-17 2015-12-17 Convertisseur avec un bouchon de soufflage par le fond à maniabilité améliorée

Country Status (4)

Country Link
EP (1) EP3290532B1 (fr)
JP (1) JP6563034B2 (fr)
CN (1) CN107109502A (fr)
WO (1) WO2017103959A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6780115B2 (ja) * 2017-07-11 2020-11-04 東京窯業株式会社 炉体及び底吹きプラグ

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE567433A (fr) *
JPS6013405B2 (ja) * 1980-11-14 1985-04-06 住友金属工業株式会社 溶融金属精錬用の羽口
JPS60135512A (ja) * 1983-12-26 1985-07-18 Nippon Steel Corp 酸素転炉
US4502670A (en) * 1984-02-02 1985-03-05 Allied Corporation Gas hook-up to a ladle
JPH0639613B2 (ja) * 1989-06-22 1994-05-25 日本鋼管株式会社 底吹き羽口
JPH0941024A (ja) * 1995-05-25 1997-02-10 Japan Casting & Forging Corp 溶融金属へのガス吹込みノズル及びその使用方法
CN2612676Y (zh) * 2003-04-17 2004-04-21 攀枝花新钢钒股份有限公司提钒炼钢厂 复吹转炉底部供气装置
JP2007262471A (ja) * 2006-03-28 2007-10-11 Tokyo Yogyo Co Ltd ガス吹き込みプラグ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
JPWO2017103959A1 (ja) 2018-09-20
EP3290532A4 (fr) 2018-05-23
EP3290532A1 (fr) 2018-03-07
WO2017103959A1 (fr) 2017-06-22
JP6563034B2 (ja) 2019-09-04
CN107109502A (zh) 2017-08-29

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