EP2882876B1 - Lance à vent chaud équipée d'un porte-vent disposé sur la sortie de vent chaud - Google Patents

Lance à vent chaud équipée d'un porte-vent disposé sur la sortie de vent chaud Download PDF

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Publication number
EP2882876B1
EP2882876B1 EP13737535.8A EP13737535A EP2882876B1 EP 2882876 B1 EP2882876 B1 EP 2882876B1 EP 13737535 A EP13737535 A EP 13737535A EP 2882876 B1 EP2882876 B1 EP 2882876B1
Authority
EP
European Patent Office
Prior art keywords
hot blast
nozzle
lance
blast lance
nozzle brick
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.)
Not-in-force
Application number
EP13737535.8A
Other languages
German (de)
English (en)
Other versions
EP2882876A1 (fr
Inventor
Christian GÜNTHER
Michael Wahl
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.)
Saarstahl AG
Original Assignee
Saarstahl 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 Saarstahl AG filed Critical Saarstahl AG
Publication of EP2882876A1 publication Critical patent/EP2882876A1/fr
Application granted granted Critical
Publication of EP2882876B1 publication Critical patent/EP2882876B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • F27D2003/168—Introducing a fluid jet or current into the charge through a lance
    • F27D2003/169—Construction of the lance, e.g. lances for injecting particles

Definitions

  • the invention relates to a hot blast lance with a nozzle arranged at the hot blast outlet for use in metallurgical processes, such as steelmaking in a converter, with at least one H exertwindaustrittsdüse in the nozzle block over which hot blast is inflated to the steel bath of a converter, according to the preamble of claim 1 ,
  • reaction gases such as oxygen state of the art. So it is also known in steel production to supply oxygen to the melt, with the aim of Remove unwanted components from the melt. This process is called "freshness".
  • the supply of oxygen can be done by bottom bubbles and / or by inflation. When bottom blowing, the converter in the bottom area on one or more special floor nozzles, through which the oxygen is supplied. In the inflation process, the oxygen is introduced by means of a lance.
  • Steelmaking in reaction vessels uses both pig iron and scrap as a feedstock.
  • pig iron used as a feedstock.
  • sponge iron in the form of DRI (Direct Reduced Iron) or HBI (Hot Briquetted Iron) can be used.
  • DRI Direct Reduced Iron
  • HBI Hot Briquetted Iron
  • Another method is from the DE 43 43 957 A1 in which in the operating phase of the converter fuels, oxygen-containing gases and iron raw materials, and scrap are introduced, and the reaction gases above the melt in the gas space of the converter with oxidizing gases are post-combusted. The resulting heat is transferred to the melt.
  • oxygen and / or fuels are supplied via bottom nozzles.
  • the hot air can be blown from above into the converter by lances with supersonic nozzles.
  • EP1316621-A2 shows such a lance, wherein the individual nozzles are interchangeable. So far, the combination of the bottom-side insufflation with oxygen and the inflating hot blast on the melt is known as such.
  • Pebble-Heater hot air can be produced with temperatures of 1,200 ° Celsius and more.
  • the hot air must then be conveyed from the hot air outlet of the pebble heater to the tip of the lance, to be blown from there into a metallurgical reaction vessel.
  • the present invention has for its object to enable the introduction of hot blast in a metallurgical vessel, such as bspwnden converter, in an efficient manner.
  • a metallurgical vessel such as bspwnden converter
  • a use according to the invention is specified in claim 16.
  • the nozzle block is provided with at least one H effetwindaustrittsdüse, and is replaceable, and rests on the hot air outlet on a support ring.
  • the hot blast provided for a metallurgical process can be conditioned solely by the use of a special nozzle block designed according to the invention at the tip of the feeding hot blast lance with regard to the parameters decisive for the beam propagation, such as beam geometry and beam impulse, without the design of the hot blast lance for this purpose moreover, it has to be changed.
  • the hot blast has a temperature of 500 ° C to 1,400 ° C, advantageously 1,200 ° C.
  • Mündungsgeschwindidgkeiten jet velocity at the outlet of the beam from the lance
  • this must be designed so that the hot blast necessarily before passing out of the lance mouth flows at speeds of 100 to 300 m / s, preferably 150 m / s through the lance body.
  • the volume of a metallurgical reactor is usually measured at the batch or tapping weight handled in the reactor. Accordingly, the geometric dimensions of the reactor vessel grow much slower than the batch or tapping weight handled in the reactor.
  • the hot blast does not penetrate into the steel bath, but essentially causes the afterburning of the exhaust gases in the converter atmosphere, so that the released energy of this post-combustion can be used in the converter.
  • the nozzle channels of the two wengistens nozzle should run obliquely to the longitudinal axis of the hot blast lance.
  • the hot blast is discharged from the nozzle with a twist and moves "helically" from above onto the steel bath.
  • the nozzle block contains more than one, preferably three nozzles. In the case of only one nozzle, this points essentially in the direction of the longitudinal axis of the hot blast lance. If there are several nozzles, make sure that the nozzle channels have a minimum angle of preferably 11 ° to each other.
  • This refinement is based on the knowledge that the run length of the jet is related to the nozzle diameter.
  • the nozzle block contains three nozzles whose nozzle channel longitudinal axes are inclined to the longitudinal axis of the hot blast lance so that they do not intersect. That is, although the nozzle channel longitudinal axes have approximately in the direction of the longitudinal axis of the hot blast lance, but only so that they do not intersect, ie thus pass. This causes an additional tilting of the nozzle channel longitudinal axes, so that they ultimately generate a swirl when exiting the hot blast.
  • the nozzle block may also have more than three nozzles.
  • the nozzles are oriented such that the longitudinal axes of two nozzles form an angle greater than 20 °.
  • This embodiment is related to the knowledge that the rays emerging from the nozzles have a certain opening angle. Furthermore, due to their flow in the edge region, the jets generate a negative pressure through which gaseous particles are drawn into the flow, which are located in this edge region.
  • the specification of the orientation of the nozzles according to the described embodiment is based on the knowledge that the so-called free jet angle of a flow is about 11 °. Since the clearance angles of the two juxtaposed flows add up, this results in the minimum angle between the center axes of the nozzles and thus between the center axes of the two flows.
  • the nozzle block consists of a refractory material or even of a high temperature resistant metallic material, such as a superalloy.
  • the inner surfaces of the nozzles can be structured with reduced flow resistance.
  • microstructures for example in the form of shark skin structures, can be selected.
  • the nozzle block is convexly formed on the hot air outlet surface.
  • the radius of curvature of the convex hot-air outlet surface is dimensioned such that the inclined longitudinal axis of the nozzle channel or the inclined longitudinal axes of the nozzle channels approximately at the radius of Convex hot blast exit surface of the nozzle block coincide. This gives a curvature in which the surface normals of the outer nozzle openings coincide approximately with the radius of the convexity.
  • the hot blast lance there is provided with a separate or integrated on an inner tube of the hot blast lance bearing ring, which holds the nozzle stone at the open end of the hot blast lance as an abutment.
  • the nozzle block does not have to be clamped, which would also be problematic due to different coefficients of material expansion coefficient between hot blast lance and nozzle block.
  • the present invention resting on the abutment nozzle block is prevented by forming a groove from it to rotate during operation of the hot blast lance radially to the lance axis.
  • both the hot blast lance itself and the nozzle block are each provided with a coolant channel system acted upon by coolant, and that the cooling channel system of the hot blast lance is connected in a coolant-connected manner to the cooling channel system of the nozzle block.
  • the nozzle stone be provided on the side facing the molten bath or steel bath in the intended use position with a shield which covers the nozzle block with the exception of the nozzle openings.
  • This shield could be understood as a kind of goggles that protects the nozzle block as such against temperature radiation, ie covering, while leaving the nozzle openings free. This ensures that the material of the nozzle stone is very well protected against the high temperature radiation, without the nozzles being disturbed in terms of flow.
  • the shielding is provided with a cooling channel system which can be charged with coolant. This has the advantage that you no longer need to cool the nozzle stone as such. This in turn has the advantage that the blown hot blast virtually no or hardly any thermal energy is withdrawn.
  • the nozzle block consists of at least two parts, that is formed in two or more parts, and that the parts are designed so that they can be complementary in the assembled state complementary to a complete nozzle stone together. This considerably facilitates the installation and replacement of the nozzle stone in the lance.
  • the nozzle channels have a contour deviating from the round cross-section, at least on the inlet side of the hot blast. Examples of this are described and illustrated below.
  • the hot air flowing into the converter is impressed on a component of movement in the horizontal direction. This advantageously increases the run length of the hot blast jet in the converter atmosphere. With a corresponding design of the geometry can be achieved by the hot blast jet remains in the converter atmosphere and does not penetrate into the steel bath.
  • FIG. 1 shows a perspective sectional view of the lower end of the hot blast lance. It can also be seen that the nozzle block rests on a bearing ring arranged at the lower end of the hot blast lance. This support ring can also be an integral part of the hot blast pipe, or the inner tube of the hot blast lance. Furthermore, it can be seen that the nozzle block in which the nozzles are arranged has a step on the outer circumference, such that the diameter of the nozzle block arranged above the step is smaller than the lower portion of the nozzle block resting on the bearing ring. Thus, in hot blast operation at the high gas-dynamic speeds, a uniform dense contact pressure is generated down on the support ring.
  • FIG. 2 shows these details again clearly.
  • the uniform contact pressure on the support ring is generated by the outer contour of the nozzle block.
  • FIG. 3 shows different versions of the nozzle block.
  • the upper part of the picture shows an embodiment with only one centric nozzle channel.
  • the lower illustration shows a nozzle stone with also three nozzle channels.
  • the special feature here is that the nozzle channels do not have a round cross section on the hot blast inlet side into the nozzle block. This cross-section can continue downwards, even in a curved nozzle channel guide, to the lower hot blast exit surface.
  • the nozzle stone itself in the hot blast lance according to the present invention may therefore be a ceramic stone, or consist of a temperature-resistant steel alloy or consist of a water-cooled copper head.
  • FIG. 4 shows three illustrations for different nozzle stone variants.
  • the picture above shows a nozzle block 1 at the lower end of a Heiwind lance 3, with an integrated cooling channel system 6.
  • This cooling channel system 6 of the nozzle block 1 is connected to the cooling channel system of the hot blast lance 3 in a fluid-tight manner.
  • the means that the coolant channels of the nozzle block are traversed by the same coolant, for example water, as the coolant channels of the hot blast lance.
  • the exchangeable nozzle block at the lower end of the hot blast lance is welded to the Heinlyn lance, such that the cooling channels of the hot blast lance are connected in a coolant-tight manner to the cooling channels of the nozzle block.
  • FIG. 4 shows a variant in which the nozzle block 1 is provided on the facing in the outer side of the molten bath with a bspw ceramic or cooled metallic shield 5, which covers the nozzle stone as far as possible but leaves the nozzle openings. This gives the nozzle stone a very advantageous shield against the high temperature radiation from the melt surface and the combustion processes during operation.
  • the lower part of the picture represents an embodiment showing the nozzle block 1 in a multi-part embodiment.
  • the individual parts of the nozzle block are in turn designed so that complement each other in the assembled state to a complete nozzle stone complementary. This considerably facilitates the installation and replacement of the nozzle block.
  • FIG. 5 shows again in a perspective sectional view of how the coolant channels 6 are connected in a coolant-tight manner with the cooling channels of the hot blast lance 3.

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  • 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)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Claims (16)

  1. Lance à vent chaud équipée d'un porte-vent disposé sur la sortie de vent chaud à utiliser dans des processus métallurgiques, comme par exemple lors de la fabrication d'acier dans un convertisseur, avec au moins une buse de sortie de vent chaud dans le porte-vent, par laquelle du vent chaud est soufflé sur le bain d'acier d'un convertisseur, caractérisée en ce que le porte-vent (1) est muni d'au moins deux buses de sortie de vent chaud ou deux canaux de buse, et peut être échangé, et repose à la sortie de vent chaud (3) sur un anneau d'appui (4), en ce que lesdits au moins deux canaux de buse (10) sont orientés de telle manière que leur axe longitudinal soit incliné par rapport à l'axe longitudinal de la lance à vent chaud (2), et en ce que les axes longitudinaux des canaux de buse sont inclinés par rapport à l'axe longitudinal, de telle manière qu'ils ne coupent pas ce dernier.
  2. Lance à vent chaud selon la revendication 1, caractérisée en ce que le porte-vent (1) comporte plus de trois canaux de buse.
  3. Lance à vent chaud selon l'une quelconque des revendications précédentes, caractérisée en ce que les buses sont orientées de telle manière que les axes longitudinaux de deux buses forment un angle supérieur à 20°.
  4. Lance à vent chaud selon l'une quelconque des revendications précédentes, caractérisée en ce que le porte-vent se compose d'un matériau réfractaire ou d'un superalliage métallique.
  5. Lance à vent chaud selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins les surfaces intérieures des buses sont revêtues et/ou polies.
  6. Lance à vent chaud selon la revendication 4, caractérisée en ce que les surfaces intérieures des buses sont structurées de façon à réduire la résistance à l'écoulement.
  7. Lance à vent chaud selon l'une quelconque des revendications précédentes, caractérisée en ce que le porte-vent est réalisé sous forme convexe sur la face de sortie de vent chaud.
  8. Lance à vent chaud selon l'une quelconque des revendications précédentes, caractérisée en ce que le rayon de courbure de la face convexe de la sortie de vent chaud est dimensionné de telle manière que l'axe longitudinal incliné du canal de buse ou les axes longitudinaux inclinés des canaux de buse coïncide(nt) environ avec le rayon de la face convexe de la sortie de vent chaud du porte-vent.
  9. Lance à vent chaud selon l'une quelconque des revendications précédentes, caractérisée en ce que la lance.à vent chaud est munie à l'extrémité de sortie de vent chaud d'un anneau d'appui séparé ou disposé de façon intégrée sur un tube intérieur de la lance à vent chaud, qui maintient le porte-vent à l'extrémité ouverte de la lance à vent chaud sous forme de contre-appui.
  10. Lance à vent chaud selon l'une quelconque des revendications précédentes, caractérisée en ce que les canaux de buse présentent au moins sur le côté d'entrée du vent chaud un contour s'écartant de la section transversale ronde.
  11. Lance à vent chaud selon l'une quelconque des revendications précédentes, caractérisée en ce que le porte-vent reposant sur l'anneau d'appui sous forme de contre-appui est empêché, par la formation d'une rainure, de tourner radialement à l'axe de la lance pendant le fonctionnement de la lance à vent chaud.
  12. Lance à vent chaud selon l'une quelconque des revendications précédentes 1 à 11, caractérisée en ce qu'aussi bien la lance à vent chaud elle-même que le porte-vent est muni respectivement d'un système de canaux de refroidissement parcouru par un agent réfrigérant, et en ce que le système de canaux de refroidissement de la lance à vent chaud est relié au niveau de l'agent réfrigérant au système de canaux de refroidissement du porte-vent.
  13. Lance à vent chaud selon l'une quelconque des revendications précédentes 1 à 12, caractérisée en ce que le porte-vent est muni sur le côté tourné vers le bain fondu ou le bain d'acier dans la position d'utilisation normale, d'un écran qui recouvre le porte-vent à l'exception de l'ouverture des buses.
  14. Lance à vent chaud selon la revendication 13, caractérisée en ce que l'écran est muni d'un système de canaux de refroidissement pouvant être parcouru par un agent réfrigérant.
  15. Lance à vent chaud selon l'une quelconque des revendications précédentes 1 à 14, caractérisée en ce que le porte-vent se compose d'au moins deux parties, c'est-à-dire qu'il est réalisé en deux ou plusieurs parties, et en ce que les parties sont réalisées de telle manière que dans l'état assemblé elles puissent être assemblées en se complétant de façon complémentaire pour former un porte-vent complet.
  16. Utilisation d'une lance à vent chaud selon l'une quelconque des revendications 1 à 15, pour le soufflage d'air chaud au-dessus d'un bain d'acier ou au-dessus d'un tas/amas de ferrailles dans un convertisseur d'aciérie.
EP13737535.8A 2012-08-08 2013-06-20 Lance à vent chaud équipée d'un porte-vent disposé sur la sortie de vent chaud Not-in-force EP2882876B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012016142A DE102012016142B3 (de) 2012-08-08 2012-08-08 Heißwindlanze mit einem am Heißwindaustritt angeordneten Düsenstein
PCT/EP2013/001826 WO2014023373A1 (fr) 2012-08-08 2013-06-20 Lance à vent chaud équipée d'un porte-vent disposé sur la sortie de vent chaud

Publications (2)

Publication Number Publication Date
EP2882876A1 EP2882876A1 (fr) 2015-06-17
EP2882876B1 true EP2882876B1 (fr) 2017-05-10

Family

ID=48794031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13737535.8A Not-in-force EP2882876B1 (fr) 2012-08-08 2013-06-20 Lance à vent chaud équipée d'un porte-vent disposé sur la sortie de vent chaud

Country Status (3)

Country Link
EP (1) EP2882876B1 (fr)
DE (1) DE102012016142B3 (fr)
WO (1) WO2014023373A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112857053A (zh) * 2020-12-31 2021-05-28 东北大学 用于冶金装置的底吹式喷枪的喷嘴装置及其应用

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201104A (en) * 1962-08-21 1965-08-17 Walter V Berry Oxygen lance for subsurface use
DE3322556A1 (de) * 1983-06-23 1985-01-10 Didier-Werke Ag, 6200 Wiesbaden Lanze zum einblasen fluidisierter stoffe in eine metallschmelze
DE3841708C1 (fr) 1988-12-10 1989-12-28 Kloeckner Cra Patent Gmbh, 4100 Duisburg, De
DE4343957C2 (de) * 1993-12-22 1997-03-20 Tech Resources Pty Ltd Konverterverfahren zur Produktion von Eisen
JPH08311524A (ja) * 1995-05-11 1996-11-26 Nippon Steel Corp 転炉吹錬用ランスノズルの熱遮蔽方法
DE19744387C1 (de) 1997-10-08 1999-04-29 Atz Evus Applikations & Tech Vorrichtung zum Spannungsabbau in radialdurchströmten Schüttgutregeneratoren
DE10102854C2 (de) * 2001-01-23 2002-11-28 Impact Ges Fuer Nichteisenmeta Lanzenkopf für eine Sauerstofflanze
GB0128878D0 (en) * 2001-12-03 2002-01-23 Boc Group Plc Metallurgical lance and apparatus
ES2380111T3 (es) * 2006-01-04 2012-05-08 Saarstahl Ag Procedimiento para precalentar aglomerados de hierro
AT506984B1 (de) * 2008-06-17 2010-06-15 Siemens Vai Metals Tech Gmbh Sauerstoffblaslanze mit schutzelement

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Publication number Publication date
WO2014023373A1 (fr) 2014-02-13
EP2882876A1 (fr) 2015-06-17
DE102012016142B3 (de) 2013-10-17

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