[go: up one dir, main page]

WO2010142407A1 - Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof - Google Patents

Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof Download PDF

Info

Publication number
WO2010142407A1
WO2010142407A1 PCT/EP2010/003411 EP2010003411W WO2010142407A1 WO 2010142407 A1 WO2010142407 A1 WO 2010142407A1 EP 2010003411 W EP2010003411 W EP 2010003411W WO 2010142407 A1 WO2010142407 A1 WO 2010142407A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
converter
inert gas
annular gap
central tube
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.)
Ceased
Application number
PCT/EP2010/003411
Other languages
German (de)
English (en)
Inventor
Lutz Rose
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.)
SMS Siemag AG
Original Assignee
SMS Siemag 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=43070009&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2010142407(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Priority to EP10723541A priority Critical patent/EP2440872B1/fr
Publication of WO2010142407A1 publication Critical patent/WO2010142407A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath
    • 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
    • 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
    • F27D1/16—Making or repairing linings ; Increasing the durability of linings; Breaking away linings
    • F27D1/1678—Increasing the durability of linings; Means for protecting
    • F27D1/1684—Increasing the durability of linings; Means for protecting by a special coating applied to the lining
    • 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
    • F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
    • F27D2003/163—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being an oxidant
    • F27D2003/164—Oxygen
    • 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
    • F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
    • F27D2003/165—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being a fuel
    • 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
    • F27D2003/166—Introducing a fluid jet or current into the charge the fluid being a treatment 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
    • 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

Definitions

  • the invention relates to a method for operating in a distributed arrangement of a plurality of central tube and an outer tube existing annular gap nozzles having soil flushing system of a BOF converter with inert gas blowing for decarburization of the melt in the converter.
  • EP 1 641 946 B1 is in connection with Aufblas vide in the production of alloyed metal melts or when refining pig iron in a converter for supporting soil injection of various energy sources, alloying agents, charring and decarburizing or the like from a central tube and at least one concentric annular channel existing Annular gap nozzles have become known.
  • hydrocarbon is blown through the annular gap in all process steps.
  • the blowing rate is 0.25 to 3.5 Nm 3 / tx min. And requires large amounts of gas.
  • the flushing blocks or blocks consist of a refractory, such as ceramic material.
  • the purging blocks or blocks are in turn interspersed with nozzles to introduce the inert gas in the metal melt in the converter.
  • the gas flows through the converter nozzles under high pressure and at high speed and enters the molten metal from below in the area of the converter base.
  • CONFIRMATION COPY Badzi achieved, which compensates, among other things, temperature differences in the molten bath.
  • the nozzles thus operate under harsh conditions, especially at their discharge end, which is permanently in contact with the molten metal. Accordingly, the nozzle is subject to high wear.
  • the burn-up or premature wear of the nozzles at their feed end is, according to experience, approximately 0.25 mm per converter charge.
  • the refractory material of the purging plug or Spülblockes in the immediate vicinity of the nozzle by the high pressure and the high velocity of the injected gas also wears heavily and thereby washed out concave.
  • the durability of the bottom with the purging blocks or blocks and the nozzles is based on the example of a 330t BOF converter in the range of about 4000 melts, whereas the durability of the likewise lined with a refractory material side walls of the converter is about 7000 melts.
  • the invention is therefore based on the object to avoid the disadvantages described above and to provide a method by which the durability of the nozzles and the purging plug or block significantly improved and thus the number of melting cycles in the converter is increased.
  • the inert gas is at least temporarily injected together with hydrocarbon and together with a through the annular gap between the central tube and the outer tube, reacted with the inert gas or gas mixture of the central tube shell gas, preferably hydrocarbon, wherein the cladding gas cleaved upon contact with the liquid steel is formed and a circular gap surrounding the annular gap, mushroom-shaped, porous steel shell.
  • the inert gas preferably argon or nitrogen, and also the hydrocarbon is injected for metallurgical treatment of the molten metal as a core jet according to the invention via the central tube or die in the molten steel, while the shell gas, in addition to hydrocarbon optionally also steam or CO 2 , as an outer ring beam blown.
  • the shell gas in addition to hydrocarbon optionally also steam or CO 2 , as an outer ring beam blown.
  • the diameter, for example up to 15 cm, and the height, for example up to 4 cm, of the mushroom-shaped, porous and circularly surrounding the nozzle steel shell can be varied.
  • the porous iron fungus thus covers, on the one hand, the flushing stone or block in the surrounding area of the nozzles, which prevents wear in the form of leaching of the refractory material.
  • the nozzles are protected by the einhausende foreclosure from burning.
  • the only used for bath movement nozzle assembly requires only small amounts of gas, which can achieve a blow rate, which is about ⁇ 0.045 Nm 3 / tx min.
  • porous iron fungus or steel jacket forms as a batch over the top of the central inert gas nozzle during the solidification of the molten metal and thus should enforce it, advantageously a small amount of oxygen can be temporarily added to the inert gas and thereby the inert gas nozzle or the central tube be burned.
  • a further embodiment of the invention provides that each annular gap nozzle is controlled individually and a constant pressure is maintained. Should there be an increase in pressure in spite of the pressure parameters previously set in the control system, whereby both the central tube and the annular gap would become clogged, a changeover to an oxygen or inert gas admixture takes place in the control system until the previously set, constant Target pressure is reached again.
  • a further advantage of the method results when the converter is operated with the so-called "slag splashing."
  • This is a known method in which the residual slag is retained in the converter after the converter has been cut off Top lance Large quantities of nitrogen are blown into the converter at high pressure and high speed, where the residual slag is sprayed to the side walls and to the bottom of the converter vessel.
  • the sprayed slag is allowed to solidify, forming a protective layer for the refractory material in the bottom and sidewalls.
  • the inventively designed in a circular manner around the annular gap, porous, also very rough iron fungus increases in this area the surface.
  • FIG. 1 is a schematic sectional view of a conventional, known in the art soil purging plug of a BOF converter
  • Fig. 2 is a schematic sectional view of a bottom spoiler of a BOF converter according to the invention, which has an annular gap nozzle arrangement for rinsing the molten steel.
  • Fig. 1 shows a known in the art soil rinse stone 1 of a BOF converter, not shown here for refining, mixing and / or rinsing a molten steel.
  • the floor scavenger 1 a pipe 2 as a nozzle, via which an inert gas 3, for example nitrogen, is blown for bath movement.
  • the nozzle / tube 2 is embedded in a monoblock 4, which consists of a refractory material, for example ceramic, which in turn is enclosed by the refractory material 5 of the lining of the converter.
  • a nozzle arrangement which consists of an annular pipe nozzle 11 made of the central pipe 2 and an outer pipe 7 enclosing this concentrically with an annular gap 8.
  • the nozzle diameter of the central tube 2 does not need to be more than 5 mm and that of the annular gap nozzle 11 not more than 1 mm.
  • Inert gas 3 and intermittently hydrocarbon are injected via the central tube 2, while hydrocarbon and / or oxygen are blown through the annular gap 8 of the annular die 11 in a mixture with inert gas as the jacket gas 9.
  • the jacket gas 9 meets with the molten steel, the hydrocarbon is split. Since this reaction requires a lot of energy, a solidification of steel in the immediate vicinity 6 of the annular gap nozzle 11 is achieved.
  • a mushroom-shaped, porous steel jacket 10 forms in a circle around the annular gap nozzles 11.
  • the porous iron fungus or steel jacket 10 prevents, on the one hand, the premature wear of the refractory material of the monobloc 4, since it lies protectively over it, and, on the other hand, a burning of the tubes 2, 7 of the annular gap nozzle 11, since it surrounds them concentrically and thus after foreclosed on the outside.
  • the porous iron fungus 10 enforces the central tube 2 of the annular gap nozzle 11, a small amount of oxygen can be added to the inert gas 3. Due to the added amount of oxygen and the associated reaction, the central tube 2 burns freely. For the annular gap 8 can also be driven an inert gas-oxygen mixture, if clogging appears. The oxygen thus serves only to control or form the size of the iron fungus 10.
  • an inert gas 3 eg Ar or N 2 , and (Ar + O 2 ) + (N 2 + O 2 ) can be driven.
  • the annular gap nozzles 11 of the converter are integrated into a control loop which on the one hand individually controls and regulates each central tube 2 and the annular gap 8 and on the other hand keeps constant the pressure with which the nozzles are acted upon. Should there nevertheless be an increase in pressure above an upper limit, the annular gap 7 and / or the central tube 2 becoming clogged, then the system is driven in the mode "oxygen / inert gas" via the control loop until the desired pressure is reached again.

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)

Abstract

L'invention concerne un procédé d'utilisation d'un système (100) de nettoyage du fond d'un convertisseur BOF doté d'une injection de gaz inerte qui décarbure le bain de fusion dans le convertisseur, le système de nettoyage du fond présentant un agencement réparti de plusieurs tuyères (11) à interstice annulaire constituées d'un tube central (2) et d'un tube extérieur (7). Le problème consiste à proposer un procédé qui améliore considérablement la tenue des tuyères et du bloc de nettoyage et ainsi augmenter le nombre de cycles de fusion dans le convertisseur. Ce problème est résolu en ce que le gaz inerte (3) injecté par le tube central (2) est injecté au moins une partie du temps en même temps que des hydrocarbures et qu'un gaz d'enveloppe (9) apporté par l'interstice (8) situé entre le tube central et le tube extérieur et qui réagit avec le gaz inerte ou le mélange de gaz du tube central (2), le gaz d'enveloppe étant dissocié lorsqu'il aboutit sur l'acier liquide, et en ce qu'une enveloppe d'acier (10) poreuse en forme de champignon est formée en cercle entourant les tuyères (11) à interstice annulaire.
PCT/EP2010/003411 2009-06-09 2010-06-08 Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof Ceased WO2010142407A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10723541A EP2440872B1 (fr) 2009-06-09 2010-06-08 Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102009024859.5 2009-06-09
DE102009024859 2009-06-09
DE102010020179.0 2010-05-11
DE102010020179A DE102010020179A1 (de) 2009-06-09 2010-05-11 Verfahren zum Betreiben eines Bodenspülsystems eines BOF-Konverters

Publications (1)

Publication Number Publication Date
WO2010142407A1 true WO2010142407A1 (fr) 2010-12-16

Family

ID=43070009

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/003411 Ceased WO2010142407A1 (fr) 2009-06-09 2010-06-08 Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof

Country Status (3)

Country Link
EP (1) EP2440872B1 (fr)
DE (1) DE102010020179A1 (fr)
WO (1) WO2010142407A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103591804B (zh) * 2013-11-28 2015-01-14 甘肃维新工程设备有限公司 钢结构衬砖设备衬砖的修补方法
CN106500513B (zh) * 2016-11-01 2019-01-15 云南冶金新立钛业有限公司 熔盐氯化炉和用于熔盐氯化炉的气体喷枪

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5819424A (ja) * 1981-07-28 1983-02-04 Kawasaki Steel Corp 転炉の炉底羽口の冷却制御法
US4435211A (en) * 1980-12-05 1984-03-06 Metallgesellschaft Aktiengesellschaft Process of blowing high-oxygen gases into a molten bath which contains non-ferrous metals
EP0644269A1 (fr) * 1993-09-21 1995-03-22 The Gas Research Institute Procédé pour contrôler la formation d'accretions à une tuyère à combustible-oxygène
WO1999029913A1 (fr) * 1997-12-11 1999-06-17 Quantum Catalytics, L.L.C. Dispositif d'injection de matiere d'alimentation et procede de regulation de l'accretion
EP1641946B1 (fr) 2003-06-25 2007-02-21 Voest-Alpine Industrieanlagenbau GmbH & Co. Procede pour produire un metal liquide d'alliage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4435211A (en) * 1980-12-05 1984-03-06 Metallgesellschaft Aktiengesellschaft Process of blowing high-oxygen gases into a molten bath which contains non-ferrous metals
JPS5819424A (ja) * 1981-07-28 1983-02-04 Kawasaki Steel Corp 転炉の炉底羽口の冷却制御法
EP0644269A1 (fr) * 1993-09-21 1995-03-22 The Gas Research Institute Procédé pour contrôler la formation d'accretions à une tuyère à combustible-oxygène
WO1999029913A1 (fr) * 1997-12-11 1999-06-17 Quantum Catalytics, L.L.C. Dispositif d'injection de matiere d'alimentation et procede de regulation de l'accretion
EP1641946B1 (fr) 2003-06-25 2007-02-21 Voest-Alpine Industrieanlagenbau GmbH & Co. Procede pour produire un metal liquide d'alliage

Also Published As

Publication number Publication date
EP2440872A1 (fr) 2012-04-18
DE102010020179A1 (de) 2010-12-16
EP2440872B1 (fr) 2013-03-20

Similar Documents

Publication Publication Date Title
DE60014802T2 (de) Drucksteuerung eines Direktschmelzverfahrens
DE69914612T2 (de) Direktschmelzverfahren
DE3720886C2 (fr)
DD140757A5 (de) Verfahren zur verbesserung der waermebilanz beim stahlfrischen
WO1996006193A1 (fr) Convertisseurs et procede d'affinage a contre-courant de matieres metalliques fondues, notamment de fonte brute pour obtenir de l'acier
DE4031403A1 (de) Keramisches schweissverfahren und lanze zur verwendung in einem solchen verfahren
DE2755165B2 (de) Verfahren zur Erhöhung des Schrottsatzes bei der Stahlerzeugung
DE2504946B1 (de) Verfahren und vorrichtung zum einschmelzen von schrott, eisenschwamm, pellets oder dgl.
DE1533891B1 (de) Verfahren und Vorrichtung zum Spruehfrischen von kohlenstoffhaltigen Metallschmelzen,insbesondere Roheisenschmelzen
EP2440872B1 (fr) Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof
EP3108017B1 (fr) Procédé de circulation d'un bain de métal et installation de four
DE69617897T2 (de) Verfahren und vorrichtung zum vakuumfeinen von stahl
EP1948833B1 (fr) Procede d'utilisation d'un four a cuve
DE10344198B4 (de) Verfahren und Anlage zum Erhöhen der Produktivität beim Stahlherstellen
EP0118655A2 (fr) Procédé pour réaliser des processus métallurgiques ou chimiques et bas-fourneau
DE112016000404T5 (de) Blaslanzen-Baueinheit zum Herstellen und Frischen von Metallen
DE2259534A1 (de) Verfahren und vorrichtung zur stahlherstellung
RU2148659C1 (ru) Способ производства трубной стали
DE3916503C1 (fr)
DE10164610C1 (de) Verfahren zum Erzeugen einer bis zu 30 % Mn enthaltenden Stahlschmelze
DE1216902B (de) Schachtofen und Verfahren zum Schrottschmelzen
DE2255945A1 (de) Siemens-martin-ofen
AT255461B (de) Verfahren und Frischgefäße zur Umwandlung von Roheisen in Stahl
DE2356924C3 (de) Verfahren und Vorrichtung zum Erschmelzen von Stählen im Elektroofen
EP4026919A1 (fr) Procédé et dispositif de production d'acier

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10723541

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2010723541

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 212/CHENP/2012

Country of ref document: IN