WO1997002365A1 - Appareil permettant la post-combustion de composants combustibles de l'atmosphere d'un four metallurgique - Google Patents

Appareil permettant la post-combustion de composants combustibles de l'atmosphere d'un four metallurgique Download PDF

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Publication number
WO1997002365A1
WO1997002365A1 PCT/US1996/011128 US9611128W WO9702365A1 WO 1997002365 A1 WO1997002365 A1 WO 1997002365A1 US 9611128 W US9611128 W US 9611128W WO 9702365 A1 WO9702365 A1 WO 9702365A1
Authority
WO
WIPO (PCT)
Prior art keywords
lance
radiant
oxidizing gas
oxygen
injector
Prior art date
Application number
PCT/US1996/011128
Other languages
English (en)
Inventor
Vladimir Alexandrovich Arutyunov
Alexander Yakovlevich Stomakhin
Alexei Varnavievich Yegorov
Vladimir Ilyich Lebedev
Vladimir Andreyevich Romenets
Valery Sergeyevich Valavin
Dmitry Dmitriyevich Kozlov
Gennady Borisovich Beremblum
Valentin Andreysvich Breus
Boris Anatolievich Chumarin
Original Assignee
Air Products And Chemicals, Inc.
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 Air Products And Chemicals, Inc. filed Critical Air Products And Chemicals, Inc.
Publication of WO1997002365A1 publication Critical patent/WO1997002365A1/fr

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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • 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
    • C21C5/4606—Lances or injectors
    • 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; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/20—Arrangements of heating devices
    • F27B3/205—Burners
    • 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
    • C21C5/305—Afterburning
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention concerns the field of metallurgy, more specifically, equipment for the post combustion of the atmosphere gases in smelting installations.
  • post combustion is also known in the art as "after-burning”.
  • a known method for post combustion of combustible components in the atmosphere in steel smelting vessels includes, feeding a jet of oxygen through an oxygen lance into the working space of the steel smelting unit (vessel) above the level of the metal in the vessel.
  • the oxygen is fed through an apparatus having several rows of outlets in the form of jets which are aimed in a direction which is inclined with respect to the horizontal plane. The outlets are positioned at different levels in the vessel or furnace.
  • the apparatus includes an oxygen lance in the form of concentric pipes for the introduction of oxygen into the vessel, and for providing cooling water for the apparatus.
  • an oxygen lance in the form of concentric pipes for the introduction of oxygen into the vessel, and for providing cooling water for the apparatus.
  • blowholes are positioned for the oxygen, in the form of jets, to exit the lance.
  • Such a device is shown by E.D. Merker in his publication "Gas Dynamic Protection ofthe Blasting Zone in Steel Smelting Installations," Moscow, Metallurgiya, 1994, at page 20, Figure 5.
  • a disadvantage of using the known device is the low efficiency seen in both the process of post combustion (after-burning) of the gases evolving in the steel smelting unit and in the creation of a gas dynamic curtain.
  • the heat evolving during the after-buming of the combustible components is not returned to the molten metal.
  • the discrete feeding of oxygen in separate jets does not create a continuous gas dynamic curtain over the metal bath. Under these conditions the efficiency of after-buming of the combustible components will not exceed 50-60%.
  • US Patents 5,050,848 and 5,051,127 disclose an apparatus and method for post combustion over a molten bath using a swirling gas flow by means of one or more tuyeres directed at the surface of the metal.
  • a lance assembly for introducing an oxidizing gas, e.g. pure oxygen has a first or oxygen delivery end and a second or oxygen supply end.
  • the oxygen delivery end contains at least one outlet for delivering oxygen into a metallurgical vessel.
  • Spaced apart (toward the supply end) from the delivery end of the lance are at least two apertures for delivery of oxygen in a direction generally pe ⁇ endicular to the longitudinal axis of the lance.
  • a radiant injector Disposed around the lance and positioned to communicate with the two apertures in the side of the lance is a radiant injector with a funnel- (conically-) shaped diffuser and a capped cylindrical section surrounding the apex opening in the funnel-shaped diffuser.
  • the capped cylindrical portion contacts the lance so that oxygen exiting the side apertures strikes deflection plates (e.g., baffles and vanes) disposed in the capped cylindrical portion of the radiant injector.
  • the funnel-shaped diffuser of the radiant injector When installed on the lance the funnel-shaped diffuser of the radiant injector is positioned so that the mouth (opposite the apex) faces the first end of the lance.
  • the lance with the radiant injector can be installed in a metallurgical vessel, e.g., electric arc furnace, basic oxygen furnace, reverberatory furnace, rotary furnace or the like, used to smelt and/or refine metals by placing the assembly in a roof, wall or other opening in the furnace so that oxygen can be directed toward the metal in the furnace.
  • Oxidizing gas e.g., oxygen
  • introduced into the lance is directed at the metal in the vessel (furnace) and at the deflection plates in the diffuser.
  • Oxidizing gas directed at the deflection plates is caused to swirl and expand along the inner surface of the funnel-shaped diffuser.
  • the swirling oxidizing gas reacts with the combustible components in the furnace gases to effect after-burning or post- combustion.
  • the diffuser becomes hot and is a source of radiant heat to be directed at the metal in the vessel.
  • Figure 4 is a view taken along lines 4-4 of Figure 3.
  • the lance assembly according to the invention, which is shown generally as 10, includes lance 12 and radiant injector 14.
  • Lance 12 has first or oxygen delivery end 16 and second or oxygen supply end 18, which is not shown, since technology for delivery of oxygen to a lance is well known.
  • Lance 12 includes at least one and preferably a plurality of oxygen delivery ports 20 and 22 at oxygen delivery end 16 for directing a supply of oxygen toward the metal contained in a metallurgical furnace.
  • Oxygen is delivered to ports 20 and 22 via oxygen passage 26 formed by manufacturing lance 12 from a series of concentric tubes or pipes as is well known in the art.
  • Disposed upwardly toward the oxygen supply end 18 of lance 12 are a plurality of apertures 28, 29, 30 and 31 which communicate with oxygen supply passage 26 and are adapted to introduce oxygen pe ⁇ endicular to the longitudinal axis of lance 12.
  • Lance 12 includes central passage 32 and concentric passage 34 for introducing and removing cooling water in lance 12.
  • deflection plates 40, 42, 44 and 46 can be positioned inside capped cylindrical portion 38 by support brackets 41 (for vane 40) and 45 (for vane 44).
  • Radiant injector 14 of Figures 1 and 2 is preferably made from refractory material such as corundum, mullite-corundum or periclase chromite.
  • apparatus 50 includes lance 52 which is identical to lance 12 of Figures 1 and 2.
  • Radiant injector 54 of Figures 3 and 4 is identical in shape to radiant injector 14 in Figure 1 except that it is fabricated as a hollow section with intemal baffle 56 which is used in conjunction with annular passages 58 and 60 to introduce and remove cooling water to and from radiant injector 54.
  • Inner surface 62 of funnel-shaped diffuser 64 of radiant injector 54 is coated with a refractory material so that, when used, it will function in a manner substantially identical to the apparatus of Figures 1 and 2. All of the other features of the apparatus of Figures 1 and 2 are inco ⁇ orated into the apparatus of Figures 3 and 4 as indicated by the use of identical reference numerals for such other features.
  • Diffuser 64 can also be made from refractory material such as corundum, mullite-corundum or periclase chromite.
  • the angle between the walls of diffuser 64 is between 140-179°.
  • An increase in the efficiency of the post combustion (after-buming) process of the combustible components of the atmosphere in metallurgical vessels can be accomplished as a result of the creation of a continuous gas dynamic curtain of oxygen in the form of a "fan-like" jet above the metal.
  • intensive catalytic combustion of carbon monoxide and hydrogen occurs on ceramic surface 37, 62 of diffuser 35, 64.
  • the discrete spectrum of the gas radiation from carbon dioxide and water molecules is transformed into a continuous spectrum of radiation from the surface of the diffuser.
  • the swirling tangentially guided jets of oxygen create the necessary vacuum in the axial region of the diffuser, thus assuring intensive inflow of the combustible components of the fumace gases toward the stream of oxygen on the inner surface of the diffuser.
  • the presence of the closed end of the capped cylindrical portion at the apex of the diffuser prevents the entrainment of burnt gases from the space above the radiant injector.
  • a device according to the present invention could be operated as follows.
  • lance assembly 10 in a converter with a capacity of 160 tons, lance assembly 10 is positioned in the mouth of the converter above the surface of the metal for post combustion (after- buming) of the combustible components of the converter atmosphere.
  • the outer diameter of lance 12 will be 400 mm, that of the outer diameter of diffuser 14 is 1000 mm, the inner diameter of capped cylindrical portion 38 is 500 mm.
  • an outside fuel e.g., natural gas can be mixed with the oxygen in the radiant injector so that the radiant injector is maintained as the radiant heat source.
  • the fuel can be introduced in any known manner, such as by a pipe disposed inside passage 32 of lance 12 or 52 or via a separate pipe terminating inside the capped cylindrical portion of radiant injector 14 or 54.
  • the diffuser and the capped cylinder portion are made with two walls with a gap in between.
  • the walls are made from steel having a carbon content between 0.08 and 0.14 percent by weight ( Russian specification St10) or stainless steel.
  • the inner surface of the diffuser and capped cylinder are covered with refractory material such as corundum, mullite-corundum or periclase chromite.
  • the refractory Iayer can be formed by plasma or gas-flame sputter coating.
  • the use of the apparatus permits an increase in the efficiency of the after-buming of the combustible components of the atmosphere in steel smelting installations by twenty to thirty percent (20-30%).
  • the industrial benefit resulting from the application of the invention is increased efficiency of the process of after-burning of the combustible components of the atmosphere in the steel smelting installation and also higher efficiency of the transfer of the evolving heat to the metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention concerne un procédé et un appareil permettant la post-combustion des gaz combustibles présents au-dessus du métal dans un four métallurgique. L'appareil comprend une lance à oxygène (12, 52) prévue pour projeter des jets (20, 22) d'oxygène depuis une extrémité ouverte (16) de la lance (12, 52) placée dans le four et depuis des ouvertures (28, 29, 30 et 31) perpendiculaires au corps de la lance (12, 52) à un emplacement au-dessus de l'extrémité (16) de la lance (12, 52) placée dans le four. Un injecteur rayonnant (14, 54) est monté sur la lance (12, 52), cet injecteur rayonnant (14, 54) ayant un diffuseur (35, 64) en forme d'entonnoir réalisé pour créer un flux tourbillonnaire d'oxygène depuis les ouvertures perpendiculaires (28, 29, 30 et 31) pour l'oxygène, l'injecteur rayonnant (14, 54) provoquant la dilatation de l'oxygène animé d'un mouvement tourbillonnaire vers le bas et vers l'extérieur depuis l'injecteur rayonnant (14, 54) et son mélange avec les gaz du four, pour en provoquer la post-combustion. Comme mentionné précédemment, l'injecteur rayonnant (14, 54) possède un diffuseur en forme d'entonnoir (35, 64). Le diffuseur (35, 64) en forme d'entonnoir entoure la lance (12, 52) avec son ouverture d'extrémité large dirigée dans la direction du métal et, lorsqu'il est chauffé par la post-combustion décrite, il se comporte dans le four comme une source de rayonnement de chaleur.
PCT/US1996/011128 1995-07-06 1996-06-28 Appareil permettant la post-combustion de composants combustibles de l'atmosphere d'un four metallurgique WO1997002365A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU9595111683A RU2084541C1 (ru) 1995-07-06 1995-07-06 Фурма для дожигания горючих газов в полости сталеплавильных агрегатов
RU95111683 1995-07-06

Publications (1)

Publication Number Publication Date
WO1997002365A1 true WO1997002365A1 (fr) 1997-01-23

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Application Number Title Priority Date Filing Date
PCT/US1996/011128 WO1997002365A1 (fr) 1995-07-06 1996-06-28 Appareil permettant la post-combustion de composants combustibles de l'atmosphere d'un four metallurgique

Country Status (2)

Country Link
RU (1) RU2084541C1 (fr)
WO (1) WO1997002365A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000028097A1 (fr) * 1998-11-10 2000-05-18 Danieli & C. Officine Meccaniche S.P.A. Dispositif integre d'injection de gaz technologiques et de substances pulverulentes, et procede d'utilisation du dispositif pour le traitement de bains de metal fondu
WO2003006693A1 (fr) * 2001-07-10 2003-01-23 Technological Resources Pty Ltd Lance d'injection de gaz
US20150344982A1 (en) * 2012-12-18 2015-12-03 Posco Lance and operation method using the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2638347B1 (fr) * 2010-11-10 2022-08-10 Berry Metal Company Distributeur renforcé pour lance de post-combustion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE898309C (de) * 1951-12-28 1953-11-30 Stahl Und Roehrenuntersuchunge Vorrichtung zum Behandeln von fluessigem Roheisen
GB968295A (en) * 1961-04-05 1964-09-02 Air Prod & Chem Improvements in metallurgical processes and apparatus
DE3340472A1 (de) * 1983-11-09 1985-05-15 Axel Friedrich 6670 St Ingbert Gonschorek Ld-konverter mit nachverbrennung
WO1986001131A1 (fr) * 1984-08-17 1986-02-27 American Combustion, Inc. Procede et appareil generateurs de flammes
US5375139A (en) * 1993-02-26 1994-12-20 Bender; Manfred Electric arc furnace insitu scrap preheating process

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE898309C (de) * 1951-12-28 1953-11-30 Stahl Und Roehrenuntersuchunge Vorrichtung zum Behandeln von fluessigem Roheisen
GB968295A (en) * 1961-04-05 1964-09-02 Air Prod & Chem Improvements in metallurgical processes and apparatus
DE3340472A1 (de) * 1983-11-09 1985-05-15 Axel Friedrich 6670 St Ingbert Gonschorek Ld-konverter mit nachverbrennung
WO1986001131A1 (fr) * 1984-08-17 1986-02-27 American Combustion, Inc. Procede et appareil generateurs de flammes
US5375139A (en) * 1993-02-26 1994-12-20 Bender; Manfred Electric arc furnace insitu scrap preheating process

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000028097A1 (fr) * 1998-11-10 2000-05-18 Danieli & C. Officine Meccaniche S.P.A. Dispositif integre d'injection de gaz technologiques et de substances pulverulentes, et procede d'utilisation du dispositif pour le traitement de bains de metal fondu
US6322610B1 (en) 1998-11-10 2001-11-27 Danieli & C. Officine Meccaniche Spa Integrated device to inject oxygen, technological gases and solid material in powder form and method to use the integrated device for the metallurgical processing of baths of molten metal
WO2003006693A1 (fr) * 2001-07-10 2003-01-23 Technological Resources Pty Ltd Lance d'injection de gaz
US6773659B2 (en) 2001-07-10 2004-08-10 Technological Resources Pty Ltd. Gas injection lance
KR100868545B1 (ko) 2001-07-10 2008-11-13 테크놀라지칼 리소시스 피티와이. 리미티드. 가스 주입 랜스
CZ300668B6 (cs) * 2001-07-10 2009-07-15 Technological Resources Pty Ltd Dmyšna pro zavádení predehrátého plynu a zarízení pro výrobu železného kovu
US20150344982A1 (en) * 2012-12-18 2015-12-03 Posco Lance and operation method using the same
US9863014B2 (en) * 2012-12-18 2018-01-09 Posco Lance and operation method using the same

Also Published As

Publication number Publication date
RU95111683A (ru) 1997-06-27
RU2084541C1 (ru) 1997-07-20

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