EP1242636B1 - Procede et dispositif permettant d'introduire un gaz dans un recipient metallurgique - Google Patents

Procede et dispositif permettant d'introduire un gaz dans un recipient metallurgique Download PDF

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Publication number
EP1242636B1
EP1242636B1 EP00993529A EP00993529A EP1242636B1 EP 1242636 B1 EP1242636 B1 EP 1242636B1 EP 00993529 A EP00993529 A EP 00993529A EP 00993529 A EP00993529 A EP 00993529A EP 1242636 B1 EP1242636 B1 EP 1242636B1
Authority
EP
European Patent Office
Prior art keywords
gas
section
cross
supply means
gas supply
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.)
Expired - Lifetime
Application number
EP00993529A
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German (de)
English (en)
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EP1242636A1 (fr
Inventor
Kurt Wieder
Johann Wurm
Mohamed Tarek El-Rayes
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.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
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 Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP1242636A1 publication Critical patent/EP1242636A1/fr
Application granted granted Critical
Publication of EP1242636B1 publication Critical patent/EP1242636B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F27B3/22—Arrangements of air or gas supply devices
    • F27B3/225—Oxygen blowing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • 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
    • C21C5/4606—Lances or injectors
    • 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

Definitions

  • the invention relates to a method for supplying a gas into a metallurgical vessel, wherein the gas is carried with a condensable component in gaseous and / or liquid state and the gas is supplied to the metallurgical vessel via one or more gas supply means, and a gas supply means to carry out the process.
  • Metallurgical vessels in particular melter gasifiers, via gas nozzles, an oxygen-containing gas, such as air or oxygen-enriched air or technical oxygen supplied.
  • an oxygen-containing gas such as air or oxygen-enriched air or technical oxygen supplied.
  • a condensable or vaporizable component is usually formed by water or water vapor.
  • Nozzles for decarburizing liquid pig iron known. These nozzles are characterized by a constriction, a diverging, the bottleneck downstream section, as well as a constriction upstream tapering section and a likewise diverging outflow section. Purpose of the section is to produce an emulsion of gas phase and pig iron by the injected gas by means of supersonic flow.
  • the object of the subject invention is to provide a method for introducing a gas into a metallurgical vessel, wherein before the gas water vapor or water is carried along and possible damage to the gas supply means greatly reduced or completely prevented.
  • the method according to the invention reliably makes it possible to evenly distribute liquid condensed in the gas phase in the gas stream, since the deposition of a liquid film in the vortex zone is no longer possible. A redeposition of a liquid film after the vortex zone is also no longer possible due to the then prevailing flow conditions and temperatures.
  • the method according to the invention further makes it possible to use the component in the liquid state, for example by spraying it into the gas stream. By saving a separate evaporation step can be achieved cost savings.
  • a preferred embodiment of the method according to the invention consists in that the gas is formed by oxygen, in particular technical oxygen, as obtained, for example, from an air separation plant.
  • the gas velocity after the first section and before the vortex zone is kept substantially constant for a while.
  • the gas velocity is kept substantially constant for a while before the first section.
  • the invention also provides a gas supply means for supplying a gas into a metallurgical vessel, wherein the gas supply means is interspersed along a central longitudinal axis of a single flow channel, and wherein water vapor or water is carried by the gas as a condensable or vaporizable component.
  • such a gas supply means is characterized by the features of claim 5.
  • a sudden cross-sectional widening here means a sudden increase in the diameter of the flow channel taking place in the gas flow direction.
  • a step is formed on the inner wall of the flow channel, which ensures sufficient atomization of deposited or entrained liquid and then sufficient turbulence and mixing of the gas components.
  • the first section or the tapering section in front of the nozzle and the outflow section after the nozzle.
  • the resulting shorter life of the nozzle and / or the refractory material resulting from this less optimal arrangement may still be sufficient for certain applications.
  • an intermediate section with a substantially constant flow cross section is arranged between the tapering section and the sudden cross-sectional widening.
  • this intermediate section is the sudden cross-sectional widening in a - optimal for turbulence and avoidance of a liquid film in the outflow - optimal distance from the melter gasifier side opening of the gas supply means.
  • the rise of the flow cross-section at the sudden cross-sectional widening has an average gradient ⁇ of substantially 90 °.
  • 90 ° does not represent the maximum upper limit for the slope ⁇ , and higher values for ⁇ may lead to expedient embodiments. From higher values for ⁇ Although a sharper tear-off edge results, this edge also wears more easily at ⁇ > 90 ° than at ⁇ ⁇ 90 °.
  • an inflow section with a substantially constant gas flow cross section is arranged upstream of the narrowing section in the gas flow direction.
  • Another aspect of the present invention relates to a device for supplying a gas into a metallurgical vessel, the device comprising one or more gas supply means according to the invention, gas supply lines to the gas supply means and means for introducing a condensable component into the gas supply means.
  • Such an insert is characterized in that along an axis which - coincides with the insert inserted into the nozzle - with the central longitudinal axis of the nozzle, a gas flow channel is guided through the insert and wherein the outer contour of the insert at least a portion of the inner contour of the taper section and wherein the cross-section of the gas flow channel is tapered in the gas flow direction and wherein the outlet opening is provided with a tear-off edge, whereby - with inserted into the nozzle insert - a the tapering section in the gas flow direction downstream jump cross-sectional expansion of the gas flow channel is formed.
  • spoiler edge is therefore to be understood as meaning the statements made above regarding the sudden cross-sectional widening.
  • the insert described above can be easily inserted into an existing nozzle, such as during a maintenance outage with remote gas supply line. Since the outer contour of the insert is accurately reshaped to the inner contour of the nozzle channel, in particular of the tapering section or at least a part thereof, the insert is pressed by the gas pressure against the tapering section at startup of the nozzle.
  • the gas flow channel or its part tapering in the gas flow direction then forms the tapered section of the converted nozzle, while the tear-off edge of the insert piece forms the sudden cross-sectional widening of the nozzle.
  • a partial region of the inner contour of the outflow section is additionally simulated by the outer contour of the insert, the inner contour then forms the intermediate portion of the converted nozzle.
  • a partial region of the inflow section can be modeled by the outer contour of the insert.
  • either the location of the trailing edge or the sudden cross-sectional widening in the retrofitted nozzle is determined and / or an overall more solid, easier to handle and accurately insertable into the nozzle part created ,
  • nozzles of the device according to the invention have a smaller cross-section immediately before the sudden increase in cross-section. This has the consequence that the admission pressure in the supply line supplying the nozzle is increased compared with the prior art and therefore - with constant supply pressure - the pressure difference at the flow control element, which is present the nozzles is lower.
  • This flow control element which throttles the supply pressure in a common supply line to the pressure prevailing in the feed lines for all nozzles, always has the disadvantage of a large noise development. Since the pressure difference between supply pressure and admission pressure is smaller, the noise development is also reduced.
  • Another advantage of the invention is that the system as a whole becomes stiffer, i. that a higher pressure prevails immediately in front of the narrowest nozzle cross-section, whereby the nozzle is prevented from penetrating by liquid phase, e.g. liquid pig iron, faster it is freed and thus nozzle damage is reduced.
  • liquid phase e.g. liquid pig iron
  • a nozzle 1 passes through the jacket 2 of a metallurgical vessel, for example a melter gasifier.
  • the nozzle 1 is formed by a water-cooled nozzle body 13.
  • a nozzle channel 6 is guided, which consists of several sections 3,4,5 and which is substantially rotationally symmetrical to a central longitudinal axis 7 of the nozzle channel 6.
  • the inflow section 3 has a substantially constant cross-section which continuously reduces in the gas flow direction 12 in a subsequent tapering section 4. Until the gas flows into the Melter carburetor, the flow cross-section is kept substantially constant in an outflow section 5.
  • the admission pressure P 1 prevails, which drops over the entire remaining length of the nozzle channel 6 to the system internal pressure P system by the pressure difference ⁇ P 1 .
  • the nozzle 1 'shown in FIG. 2 likewise has an inflow section 3 with a substantially constant flow cross-section which is continuously reduced in the gas flow direction 12 in a taper section 4.
  • At the tapering section 4 here includes an intermediate section 8 with a constant cross-section.
  • On the intermediate section 8 follows a sudden cross-sectional widening 9, which is executed in the drawing as a right-angled recess 9 in the nozzle inner wall. It is essential that the step formed by the recess 9 is not executed too high, so that the difference between the two diameters before and after the recess 9 is not too large, so that the pressure loss is not too high. It is also essential that the recess 9 is provided with a sharp spoiler lip to ensure sufficient atomization.
  • a ratio of the two diameters of 1: 1.05 to 1: 1.25 has proven particularly advantageous.
  • An outflow section 5 again of essentially constant cross-section, adjoins the abrupt cross-sectional widening 9, the zone immediately adjoining the cross-sectional widening 9 being the vortex zone 10, in which the gas and entrained component are intimately mixed.
  • the nozzle 1 shown in Fig. 3 has an insert 11 through which a as shown in Fig. 1 is equipped to a nozzle according to the invention 1 '.
  • the inner contour of the insert 11 Due to the outer contour of the insert 11, the inner contour of the entire original tapering section 4, and in each case a part of the inflow 3 and outflow section 5 are accurately reproduced.
  • the inner contour of the insert 11 is formed such that it in turn has a taper portion 4 'and an intermediate portion 8.
  • nozzles 1 can take place during a maintenance shutdown of the melter gasifier in a simple manner in which the insert is inserted from the outside into the nozzle channel 6 when the supply line is removed.
  • FIG. 4 shows two embodiments of the cross-sectional widening in detail, wherein in FIG. 4a the increase in the flow cross-section relative to the longitudinal axis 7 has a pitch ⁇ of 90 ° and in FIG. 4b a pitch ⁇ of 70 °.
  • FIG. 5 of the approximately 20 to 30 oxygen nozzles which pass through the jacket of a melter gasifier at a certain height section and approximately equally spaced, two nozzles 1 'are shown by way of example.
  • Each of the nozzles 1 ' is provided with at least one gas supply line 14, through which the nozzle 1' is supplied with oxygen or oxygen-containing gas.
  • the oxygen supply pressure to the prevailing in the ring line 17 and the gas supply lines 14 form is then throttled P 2 by a flow control member 16.
  • the ring line 17 then supplies all other (not shown here) gas supply lines, or nozzles, with oxygen.
  • the nozzles 1 ' are provided with a means 18 for introducing water or water vapor.
  • This means 18 is formed in the simplest case as a water or steam line, which opens into the nozzle channel.
  • the direction of water or water vapor injection may conveniently be both in, against, and normal to the gas flow direction within the nozzle channel respectively.
  • water is injected in the gas flow direction within the nozzle channel in this.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Details (AREA)

Claims (9)

  1. Procédé en vue de l'alimentation d'un gaz dans une cuve métallurgique, de la vapeur d'eau ou de l'eau étant co-alimentée en tant que composant condensable et/ou évaporable avec le gaz et le gaz étant alimenté à la cuve métallurgique par l'intermédiaire d'un ou de plusieurs moyens d'alimentation de gaz, dans le cas d'un nombre de moyens d'alimentation de gaz dans chacun de ces moyens d'alimentation de gaz
    • la vitesse du gaz étant augmentée en continu dans une première section,
    • le gaz étant mélangé de manière intime dans une zone de tourbillonnement avec les composants condensables ou évaporables, la zone de tourbillonnement étant formée par un élargissement soudain de la section transversale de la section transversale d'écoulement avec une pente, par rapport à l'axe longitudinal du canal d'écoulement, d'au moins 60°,
    • le gaz mélangé de manière intime aux composants co-alimentés étant insufflé dans la cuve métallurgique par l'intermédiaire d'une section d'évacuation et
    • la vitesse du gaz sur la section d'évacuation étant maintenue pour l'essentiel constante ou légèrement dégressive.
  2. Procédé selon la revendication 1, caractérisé en ce que le gaz est formé de gaz contenant de l'oxygène, en particulier de l'oxygène technique.
  3. Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé en ce qu'après la première section et avant la zone de tourbillonnement, la vitesse du gaz est maintenue pendant un certain temps pour l'essentiel constante.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'avant la première section, la vitesse du gaz est maintenue pendant un certain temps pour l'essentiel constante.
  5. Moyen d'alimentation de gaz (1') en vue de l'exécution du procédé selon l'une ou plusieurs des revendications 1 à 4, en vue de l'alimentation d'un gaz dans une cuve métallurgique, le moyen d'alimentation de gaz (1') étant traversé le long d'un axe longitudinal central (7) par un canal d'écoulement unique (6) et de la vapeur d'eau ou de l'eau étant co-alimentée avec le gaz en tant que composant condensable et/ou évaporable, le canal d'écoulement (6) - en partant d'une section transversale déterminée -
    • présentant au moins un élargissement de section transversale soudain (9) du canal d'écoulement en vue du tourbillonnement et du mélange intime du liquide condensable ou évaporable avec le gaz,
    • l'augmentation de la section transversale d'écoulement à l'élargissement soudain de la section transversale (9) - par rapport à l'axe longitudinal (7) du canal d'écoulement (6) - présentant une pente moyenne α d'au moins 60°, de préférence, d'au moins 75°, et
    • une section d'évacuation (5), qui est disposée à la suite de l'élargissement de section transversale (9) dans la direction d'écoulement du gaz (12) et qui ne présente qu'une alimentation de gaz centrale unique,
    une section d'étranglement (4) étant disposée avant l'élargissement de section transversale (9) dans la direction d'écoulement du gaz (12), laquelle section d'étranglement (4) présente une section transversale d'écoulement effilée dans la direction d'écoulement du gaz (12).
  6. Moyen d'alimentation de gaz (1') selon la revendication 5, caractérisé en ce qu'entre la section d'étranglement (4) et l'élargissement soudain de section transversale (9) est disposée une section intermédiaire (8) ayant, pour l'essentiel, une section transversale d'écoulement constante.
  7. Moyen d'alimentation de gaz (1') selon la revendication 5, caractérisé en ce que l'accroissement de la section transversale d'écoulement à l'élargissement soudain de section transversale (9) présente une pente moyenne α, pour l'essentiel, de 90°.
  8. Moyen d'alimentation de gaz (1') selon l'une quelconque des revendications 5 à 7, caractérisé en ce que la section d'évacuation est formée de telle sorte que la vitesse de gaz sur la section d'évacuation est maintenue, pour l'essentiel, constante ou légèrement dégressive.
  9. Dispositif en vue de l'alimentation d'un gaz dans une cuve métallurgique, le dispositif comprenant un ou plusieurs moyens d'alimentation de gaz (1') selon l'une quelconque des revendications 1 à 8, ainsi que des conduits de gaz (14) allant aux moyens d'alimentation de gaz (1') et des moyens (18) en vue de l'introduction d'eau ou de vapeur d'eau en tant que composants condensables ou évaporables dans le moyen d'alimentation de gaz (1').
EP00993529A 1999-12-20 2000-11-07 Procede et dispositif permettant d'introduire un gaz dans un recipient metallurgique Expired - Lifetime EP1242636B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT214699 1999-12-20
AT0214699A AT408348B (de) 1999-12-20 1999-12-20 Verfahren und vorrichtung zum zuführen eines gases in ein metallurgisches gefäss
PCT/EP2000/010964 WO2001046479A1 (fr) 1999-12-20 2000-11-07 Procede et dispositif permettant d'introduire un gaz dans un recipient metallurgique

Publications (2)

Publication Number Publication Date
EP1242636A1 EP1242636A1 (fr) 2002-09-25
EP1242636B1 true EP1242636B1 (fr) 2007-10-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00993529A Expired - Lifetime EP1242636B1 (fr) 1999-12-20 2000-11-07 Procede et dispositif permettant d'introduire un gaz dans un recipient metallurgique

Country Status (8)

Country Link
US (1) US6802887B1 (fr)
EP (1) EP1242636B1 (fr)
KR (1) KR100747804B1 (fr)
CN (1) CN1273622C (fr)
AT (2) AT408348B (fr)
AU (1) AU774033B2 (fr)
DE (1) DE50014696D1 (fr)
WO (1) WO2001046479A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011002616A1 (de) * 2010-03-31 2011-12-15 Sms Siemag Ag Überschalldüse zum Einsatz in metallurgischen Anlagen sowie Verfahren zur Dimensionierung einer Überschalldüse
AT510565B1 (de) 2011-06-21 2012-05-15 Siemens Vai Metals Tech Gmbh Vorrichtung zur regelung von prozessgasen in einer anlage zur herstellung von direkt reduzierten metallerzen
KR102158227B1 (ko) * 2018-08-02 2020-09-21 주식회사 포스코 풍구 수취입 장치

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Publication number Priority date Publication date Assignee Title
AT238237B (de) 1961-05-18 1965-01-25 Voest Ag Blaseinrichtung zur Durchführung metallurgischer Prozesse
US3269829A (en) * 1963-09-24 1966-08-30 United States Steel Corp Method and apparatus for introducing steam and oxygen into a bath of molten steel
GB1446612A (en) 1973-03-09 1976-08-18 British Steel Corp Oxygen lances
IT997285B (it) * 1973-08-08 1975-12-30 Italsider Spa Perfezionamenti agli ugelli per le teste di lancia per il soffiag gio dell ossigeno dall alto nei processi di affinazione
DE2512947A1 (de) 1975-03-24 1976-10-07 Alex Borchert Schneidbrennerduese
US4249722A (en) 1979-05-11 1981-02-10 Dravo Corporation Apparatus for the flash oxidation of metal concentrates
FR2540519A2 (fr) * 1980-08-26 1984-08-10 Ugine Aciers Buse d'injection d'oxygene a jet supersonique stabilise pour la decarburation des fontes et, en particulier, des fontes au chrome
FR2489368A1 (fr) * 1980-08-26 1982-03-05 Ugine Aciers Nouvelle buse pour lance d'injection d'oxygene pour la decarburation des fontes et application a la decarburation des fontes au chrome
LU85363A1 (fr) 1984-05-15 1986-01-29 Arbed Dispositif d'adaptation pour tuyere d'acceleration de particules solides
US5636980A (en) * 1994-04-12 1997-06-10 Halliburton Company Burner apparatus
US5714113A (en) 1994-08-29 1998-02-03 American Combustion, Inc. Apparatus for electric steelmaking
DE19529932C1 (de) * 1995-08-02 1997-01-16 Mannesmann Ag Lanzenkopf einer Blaslanze zur Behandlung von Schmelzen
GB9708543D0 (en) * 1997-04-25 1997-06-18 Boc Group Plc Particulate injection burner
US5997596A (en) * 1997-09-05 1999-12-07 Spectrum Design & Consulting International, Inc. Oxygen-fuel boost reformer process and apparatus
IT1302798B1 (it) 1998-11-10 2000-09-29 Danieli & C Ohg Sp Dispositivo integrato per l'iniezione di ossigeno e gastecnologici e per l'insufflaggio di materiale solido in

Also Published As

Publication number Publication date
AU5441501A (en) 2001-07-03
DE50014696D1 (de) 2007-11-15
WO2001046479A1 (fr) 2001-06-28
KR20020063595A (ko) 2002-08-03
AT408348B (de) 2001-10-25
EP1242636A1 (fr) 2002-09-25
KR100747804B1 (ko) 2007-08-08
AU774033B2 (en) 2004-06-17
CN1413266A (zh) 2003-04-23
US6802887B1 (en) 2004-10-12
CN1273622C (zh) 2006-09-06
ATE374839T1 (de) 2007-10-15
ATA214699A (de) 2001-03-15

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