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EP2922977B1 - Procédé de soufflage et dispositif de fabrication d'acier mettant en oeuvre des jets d'air chaud - Google Patents

Procédé de soufflage et dispositif de fabrication d'acier mettant en oeuvre des jets d'air chaud Download PDF

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Publication number
EP2922977B1
EP2922977B1 EP13799236.8A EP13799236A EP2922977B1 EP 2922977 B1 EP2922977 B1 EP 2922977B1 EP 13799236 A EP13799236 A EP 13799236A EP 2922977 B1 EP2922977 B1 EP 2922977B1
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EP
European Patent Office
Prior art keywords
hot air
jets
nozzles
pig iron
nozzle
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
EP13799236.8A
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German (de)
English (en)
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EP2922977A1 (fr
Inventor
Karl Brotzmann
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
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Primetals Technologies Austria GmbH
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Publication date
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Publication of EP2922977A1 publication Critical patent/EP2922977A1/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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/305—Afterburning
    • 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
    • C21C5/32—Blowing from above
    • 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
    • C21C5/35—Blowing from above and 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
    • 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
    • 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
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0046—Heating elements or systems using burners with incomplete combustion, e.g. reducing atmosphere
    • F27D2099/0048—Post- combustion

Definitions

  • the present application relates to processes for making steel by refining using blast of hot air in suitable converters.
  • blowing process a pig iron melt is refined by means of gaseous oxygen or air as a freshing agent. In this case, heat is released, which keeps the temperature of the melt above its solidification point.
  • blowing methods are known in the art, depending on how the refreshing agent is fed into or on the pig iron melt - for example, inflation and bottom blowing methods and methods in which both inflated as well as blown - called, for example, combined blowing process.
  • the molten pig iron may consist of, for example, pig iron and scrap and / or other solid iron carriers or be obtained.
  • Heat for melting solid starting materials is usually supplied primarily by the oxygen-induced oxidation processes in the melt.
  • a converter is understood to mean a vessel for carrying out a blowing process.
  • blowing processes there are also fresh hearth processes, which are not refined as in blowing process by supplying air or gaseous oxygen as a fresh agent.
  • Agent for the oxidation of accompanying elements in a molten pig iron is supplied from added scrap and ore.
  • converter are in the context of this application meant no vessels for carrying out fresh hearth processes; For example, the term hearth furnace exists for such vessels.
  • converter does not mean vessels for carrying out electrical steel processes; for such vessels, for example, the term electric furnace or electric arc furnace exists.
  • energy can additionally be introduced into the refining process in the case of a bottom-blowing converter if the reaction gases - for example carbon monoxide CO - are post-combusted by hot air jets directed at the bath.
  • the scrap set can thus be increased from approx. 230 kg / t steel to 430 kg / t steel.
  • the existing theory assumes that the action of the bottom nozzles causes a large number of iron droplets to be thrown into the gas space above the melt, which then forms the required surface for the transmission of the high amount of energy. This theory suggests that by forming small iron droplets about 0.1 mm in diameter, the surface area of the iron bath is increased by a factor of about 10, thereby transferring the significant energy from the hot inflation jet and post-combustion to the iron bath becomes.
  • the present invention is based on the surprising finding that in a converter for oxygen inflation, that is to say bubbles without bottom nozzles, reactions can definitely take place by which the transfer of energy to the iron bath from the afterburning of reaction gases by hot air jetting can be explained. It could play the following processes.
  • a converter for oxygen inflation that is to say bubbles without bottom nozzles
  • reactions can definitely take place by which the transfer of energy to the iron bath from the afterburning of reaction gases by hot air jetting can be explained. It could play the following processes.
  • a hot air jet with the same amount of oxygen, about the 10-fold pulse. This particularly affects the impact of the hot air jet on the bath surface.
  • This liquid iron is sprayed and the droplets energy is transferred to the bath.
  • a high energy transfer through the hot air jet is conceivable even with an inflation converter.
  • An apparatus for carrying out such a method is also presented.
  • Blowing process for steel production in converters from a pig iron melt characterized in that at least one jet of hot air is injected into the converter space above the pig iron melt from at least one nozzle of at least one injection device onto the pig iron melt, wherein for the hot air emerging as a jet, there is a pressure difference of 0.05-0.1 MPa between entry into the nozzle and exit from the nozzle.
  • the hot air is blown onto the raw iron bath under certain conditions.
  • good conditions result when there is a pressure difference of 0.05-0.1 MPa between the inlet into the nozzle and the exit from the nozzle for the hot air emerging as the jet.
  • the pressure should be higher when entering the nozzle than at the outlet.
  • the hot air supplied to the nozzle should have a pressure at entry into the nozzle which is 0.05 to 1 MPa higher.
  • nozzle is meant a component that makes a jet of hot air supplied to the nozzle; this is done by narrowing the channel through which the hot air flows. For example, it may be a venturi.
  • a Blowing process for steel production in converters from a pig iron melt which is characterized in that several jets of hot air are injected into the converter space above the pig iron melt from a plurality of nozzles of at least one injection device onto the pig iron melt, wherein there is a pressure difference of 0.05-0.1 MPa between entry into the nozzles and exit from the nozzles for the hot air emerging as jets.
  • the formation of droplets by the jets is spread over a larger area, which facilitates the deposition of the droplets before and thus the elimination of their leaving the converter.
  • the multiple jets of hot air are to be arranged so that they do not flow into each other by mutual suction before they reach the pig iron melt.
  • a lance can, for example, be injected by means of a lance as an injection device which has one or more nozzle openings, from which one or more jets emerge.
  • one or more jets of hot air can also be injected from one or more side nozzles in the converter mouth as injection devices. Or several rays from both lance and side nozzle.
  • it is a Blowing process for steel production in converters from a pig iron melt, which is characterized in that several jets of hot air are injected into the converter space above the pig iron melt from a plurality of nozzles of at least one injection device onto the pig iron melt, wherein there is a pressure difference of 0.05-0.1 MPa between the entry into the nozzles and exit from the nozzles for the hot air emerging as jets, and wherein the jets travel a run length from the exit of the injection device until impacting the molten pig iron, the jets leaving the injection device at a distance of at least 0.03 - 0.05 times the run length.
  • the maximum feasible distance is given by the boundary conditions under which the method is performed. For example, if injected by means of a lance as Eindüsvorraum, then the dimensions of the lance are limiting for the maximum feasible distance.
  • the hot air is thus blown according to the invention under certain conditions to the crude iron bath.
  • optimum conditions arise when the diameter of the nozzles of the injection device - and thus the diameter of the jets of hot air - at the pressure conditions of the invention 0.03 to 0.05 times the run length of the jets, ie the distance between the nozzle opening and Bath surface measured in the direction of movement of the beam is.
  • the jet should not penetrate too deep into the bath of raw molten iron, because otherwise a backflow takes place in the bath, which is directed more upward and thus iron droplets are discharged with the flow through the converter mouth, so not enough by a deflection of the flow at the Converter wall are deposited.
  • the jet penetrates too deeply into the molten pig iron, it will atomise more iron and the backflow of the hot gases will be adversely affected by the gases receiving an upwardly directed jet component as they exit the dip created by the jet of hot air in the molten pig iron. If the jet does not accelerate the droplets parallel to the surface of the molten pig iron high enough to largely separate them when the flow direction on the side wall of the converter changes, some of the droplets remain in the gas flow and are discharged with the hot gas.
  • the temperature of the hot air is 800 ° C to 1600 ° C. Under hot air is thus 800 - 1600 ° C hot air to understand in the context of this application; optionally enriched to an increased oxygen content as indicated below.
  • a temperature range of 800 ° C to 1400 ° C is advantageous, a temperature range of 1000 ° C to 1400 ° C is particularly advantageous. This temperature range is technically easy to master and brings a high thermal efficiency.
  • the rays should strike the bath of pig iron melt as individual rays, and not unite before.
  • the jets are directed away from each other, with the directions of the jets forming an angle of at least 6 ° with each other.
  • the jets are directed upon exiting the injection device, that is, they have a main direction of movement that can be represented by a vector.
  • the angle exists between these vectors of two rays.
  • the upper limit for the angle is given by the fact that the rays of hot air should not hit the lining on the edge of the converter, but on the bath in the converter - and still enough space left to form the direction of the beam towards the edge.
  • the diameter of the jets when leaving the Eindüsvorraum is 0.01 to 0.05 times the run length. Thereby, a contribution is made to avoid merging before reaching the pig iron melt.
  • the distance between a plurality of jets when leaving the injection device at least their diameter when leaving the Eindüsvorraum.
  • leaving the injection device is meant leaving the respective nozzle of the injection device.
  • the rays are directed so that the directions of the rays with the vertical enclose an angle of at least 6 °. Thereby, a contribution is made to avoid merging before reaching the pig iron melt.
  • a central jet is provided, which is directed perpendicular to the pig iron melt.
  • peripheral rays are present in addition to the central ray, the directions of the peripheral rays including the direction of the central ray being at an angle of at least 6 °, and preferably at least 8 °.
  • the upper limit for the angle is given by the fact that the peripheral rays of hot air should not hit the lining on the edge of the converter, but on the bath in the converter - and still enough space left to form the direction of the beam towards the edge.
  • this is achieved in that the central jet generates more droplets than the peripheral rays - and these droplets are then pressed by means of the peripheral rays on the pig iron melt.
  • the peripheral beams are arranged symmetrically about the central beam.
  • the diameter of the central jet at the exit from the injection device is at least the diameter of a peripheral jet of hot air. It can also be larger, so be a stronger beam.
  • a further nozzle is mounted in the center of the arrangement according to the invention, which blows perpendicular to the bath surface.
  • This nozzle should be at least as large as the peripheral nozzle according to the invention, but then must be directed at least by 8 ° to the outside.
  • the effect of the advantageous nozzle combination can probably be explained by the fact that an additional droplet formation takes place through the central hot air jet, which then intensifies the mode of action of the peripheral nozzles.
  • fuel is supplied to at least one jet.
  • further energy can be introduced into the steelmaking process if fuel is added to the jet of hot air, preferably hydrocarbon, more preferably natural gas.
  • fuel is added to the jet of hot air, preferably hydrocarbon, more preferably natural gas.
  • Optimum values are achieved when so much natural gas is added that about 20-40% of the oxygen contained in the jet of hot air is used for the combustion of natural gas. This value is based on full combustion of natural gas, that is, according to the invention, about 5 Nm 3 of natural gas per 100 Nm 3 of non-oxygen-enriched hot air are added.
  • the fuel may also be coal dust, for example.
  • the hot air is enriched with oxygen, preferably up to 40%. With more enrichment, wear of the injection device would occur more intensively.
  • a particularly important application of the invention relates to increasing the heat input into the steelmaking process while increasing the calorific value of the exhaust gas.
  • the usual afterburning of converter process gases with hot air produces an exhaust gas with such low calorific value that it can no longer be treated in conventional exhaust gas purification systems which are operated without full combustion. It must therefore be completely burned in the hot state after leaving the converter with air, which increases the amount of exhaust gas significantly.
  • the capacity of existing exhaust treatment plants limits the conversion of an existing converter to the new process.
  • the blowing process is an inflation process wherein in a first phase of the refining process, the multiple jets of hot air are injected into the converter space above the pig iron melt from at least one injection device onto the molten pig iron, and After completion of the first phase in a second phase with oxygen finishes without injection of the jets of hot air.
  • the at least one injection device is arranged in the upper region of the converter; it includes hot air nozzles, through which the hot air is injected into jets; For example, it is a hot air lance, which is removed after the first phase.
  • the jets of hot air are rougher on the bath in the converter Directed iron melt.
  • the mixture is refined with an oxygen lance.
  • the time distribution over the two phases depends on how much energy is to be additionally introduced into the converter process. If, for example, when refining pig iron, the scrap rate should only be increased by 5 percentage points, for example from 230 kg scrap / t steel to 280 kg scrap / t steel, it is sufficient if 20% of the required amount of oxygen is blown by blasting hot air become.
  • an oxygen replenisher converter additional energy is added to increase the scrap rate by blowing only hot air in a first phase of the refining process and only oxygen in a second phase of the refining process.
  • Energy input is significantly increased by adding natural gas, for example, to the jet of hot air.
  • the first example relates to the production of steel from pig iron and scrap in an oxygen-blowing converter with a melting capacity of 100 t, which is operated according to the present invention at the beginning of the fresh process with hot air jets.
  • 900 kg of pig iron and 180 kg of scrap were charged into the converter to produce one tonne of steel.
  • the scrap rate is increased to 350 kg / t steel.
  • the degree of post-combustion is 55%.
  • a maximum of 35,000 Nm 3 / h can be recorded in the existing exhaust gas detection system.
  • the use of hot air instead of oxygen prolongs the given limit Amount of exhaust gas the melting time of 20 min. to 25 min., In addition, the exhaust gas can not be recycled.
  • the blowing time is 18 min at a hot air blow rate of 32,000 Nm 3 / h.
  • the meltable scrap quantity increases to 400 kg / t steel, whereby 14 min. long with hot air and the remaining 4 min. was freshened up with oxygen bloat.
  • the degree of post-combustion is again 60%, but now there is a gas that is so high in calorific value that it can be detected in conventional converter exhaust systems.
  • the hot air inflation is stopped after 80% of the melting time and the melt is finished with the help of the oxygen blowing lance.
  • the blowing process is a bottom blowing process.
  • the opening for the reaction gases or exhaust gases is above the spray zone formed by bottom-blowing nozzles.
  • the hot air is used for the afterburning of the reaction gases.
  • the jets of hot air are preferably blown through nozzles whose diameter is 0.01 to 0.03 times the run length of the jets of hot air.
  • the distance between the nozzle openings is at least as large as the nozzle diameter.
  • the individual nozzles are directed at least 8 ° outwards.
  • the opening for the jets of hot air is within the converter mouth.
  • the inventive method is used in a bottom-blowing converter.
  • a considerable amount of energy is present, which can be fed by post-combustion with hot air running in the converter processes, such as melting process.
  • the scrap set, the bottom-blowing Converters operating without post-combustion are at about 200 kg / t steel, increasing by about 200 kg / t steel.
  • approximately 700 kg / pig iron / t steel and 400 kg scrap / t steel are charged into a 60 t converter.
  • bottom nozzles is refined in the usual way with oxygen at a blowing rate of 6000 Nm3 / h and simultaneously inflated by a retracted into the converter mouth hot air lance with a blowing rate of 30,000 Nm3 / h hot air, which is enriched to an oxygen content of 30%.
  • the run length of the jets of hot air is 3.5 m.
  • the jets of hot air emerge from three nozzle openings each 13 cm in diameter, which are arranged at a distance of 15 cm in the hot air lance out.
  • the rays are inclined at least 8 ° outwards from the vertical.
  • steel is produced under the same conditions as in the first example of a bottom blowing process in a 250t converter.
  • the run length of the jets of hot air is 5 m.
  • the hot air blowing rate is 80000 Nm3 / h.
  • the hot air lance has five nozzle openings each 15 cm in diameter.
  • the distance between the nozzles is 17 cm.
  • the nozzles are arranged in a circle in the lance, the nozzles having a distance of 20 cm to the center of the lance and each 20 cm between the nozzles.
  • the direction of the rays is directed at least 8 ° outwards.
  • the hot air lance has a diameter of about 70 cm.
  • Another object of the present application is an apparatus for carrying out a method according to the invention, comprising a Eindüsvorraum suitable for injection of jets of hot air into a converter space above a molten pig iron in the converter wherein the jets of hot air leaving the injection device through nozzles, characterized in that the nozzle openings the nozzles are at a distance from each other which is at least 0.03 - 0.05 times the run length.
  • the hot air exits through the nozzle openings of the nozzles.
  • nozzle openings there are at least 3 nozzle openings.
  • a given amount of hot air is well distributed during injection, which causes a better afterburning of reaction gases.
  • droplet formation is distributed over several locations, making it easier to avoid the discharge of droplets.
  • the number of nozzle openings of course, the conditions with respect to the distance of the nozzle openings must be given.
  • the longitudinal axes of the nozzles enclose an angle of at least 6 ° with each other.
  • the nozzles have longitudinal axes that enclose an angle of at least 6 ° with each other. This reduces the risk of multiple jets merging.
  • the distance of the nozzle openings from each other is at least as large as the diameter of the nozzle openings.
  • a central nozzle is present. From this, a jet of hot air can be directed perpendicular to the pig iron melt.
  • peripheral nozzles are provided in addition to the central nozzle, wherein the longitudinal axes of the peripheral nozzles with the longitudinal axis of the central nozzle at an angle of at least 6 °, and preferably at least 8 ° include.
  • the injection device is a hot air lance, so a lance suitable for the injection of hot air.
  • the injection device is preferably positioned so that in the presence of several rays, the jets of hot air in the converter mouth exit from it - ie not outside the converter. If only one jet is present, which is directed, for example, according to the method of the invention from a hot air lance in the direction of the extension of its longitudinal axis on the molten pig iron, it may also outside of the converter mouth - ie outside the converter - emerge from her.
  • the nozzle openings are the ends of the nozzles from which jets of hot air emerge.
  • FIG. 1 schematically shows an inventive inflation in the first phase of the refining process.
  • Several jets of hot air represented by corrugated arrows are injected from a hot air lance 1 in the converter space 2 on the pig iron melt 3.
  • the pig iron melt 3 is located in the converter 4.
  • FIG. 2 schematically shows a bottom blowing method according to the invention.
  • Several jets of hot air represented by corrugated arrows are injected from a hot air lance 5 in the converter space 6 above the pig iron melt 7.
  • the pig iron melt 7 is located in the converter 8. Via bottom nozzles 9, oxygen is introduced into the pig iron melt 7 for refining.
  • FIG. 3 It is shown how in a nozzle device hot air lance in a nozzle head with 3 nozzles, the nozzles are arranged to each other.
  • the angle between the intersecting, dashed longitudinal axes of the nozzles is 8 °.
  • FIG. 4 an arrangement is shown in a Eindüsvorraum hot air lance, in which a central nozzle and 3 peripheral nozzles are present in the nozzle head.
  • the longitudinal axes of the peripheral nozzles enclose with the longitudinal axis of the central nozzle an angle of 8 °, represented by a peripheral nozzle and the central nozzle with dashed longitudinal axes.
  • FIG. 1 and FIG. 2 several jets of hot air in the converter mouth exit from the injection device.
  • FIG. 5 is shown as a jet shown by a corrugated arrow in the direction of extension of the longitudinal axis of the hot air lance 10 outside the converter 11 exits the hot air lance 10.
  • the hot air lance has a vertical longitudinal axis, so the jet of hot air exits vertically.
  • FIG. 5 is suitable for an inflation method or a floor blow method.
  • composition of a molten metal in the converter changes in the course of the process.
  • pig iron melt is meant the molten metal in the converter during the whole course of the refining.

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

Claims (21)

  1. Procédé de soufflage destiné à la fabrication d'acier dans des convertisseurs d'une fusion de fonte brute, caractérisé en ce qu'au moins un jet d'air chaud dans l'espace de convertisseur est insufflé au-dessus de la fusion de fonte brute depuis au moins une buse d'au moins un dispositif d'injection sur la fusion de fonte brute, dans lequel pour l'air chaud sortant sous forme de jet, il existe une différence de pression de 0,05 à 0,1 MPa entre l'entrée dans la buse et la sortie hors de la buse.
  2. Procédé selon la revendication 1, caractérisé en ce que plusieurs jets d'air chaud dans l'espace de convertisseur sont injectés par-dessus la fusion de fonte brute depuis plusieurs buses d'au moins un dispositif d'injection sur la fusion de fonte brute,
    l'air chaud sortant sous forme de jets présentant une différence de pression de 0,05 à 0,1 MPa entre l'entrée dans les buses et la sortie hors des buses.
  3. Procédé selon la revendication 2, caractérisé en ce que les jets dès la sortie du dispositif d'injection jusqu'au contact sur la fusion de fonte brute couvrant une longueur de course,
    les jets à la sortie du dispositif d'injection présentant un écartement mutuel d'au moins de 0,03 à 0,05 fois celui de la longueur de course.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce qu'il y a au moins 3 jets.
  5. Procédé selon l'une des revendications 3 et 4, caractérisé en ce que les jets sont dirigés à l'opposé l'un de l'autre, les directions des jets formant l'un avec l'autre un angle d'au moins 6°.
  6. Procédé selon l'une des revendications 3 à 5, caractérisé en ce que le diamètre des jets à la sortie du dispositif d'injection est de 0,01 à 0,05 fois la longueur de course.
  7. Procédé selon l'une des revendications 2 à 6, caractérisé en ce que l'écartement mutuel des jets à la sortie du dispositif d'injection est au moins celui de leur diamètre à la sortie du dispositif d'injection.
  8. Procédé selon l'une des revendications 2 à 7, caractérisé en ce que les jets sont dirigés de telle sorte que les directions des jets avec la verticale formant un angle d'au moins 6°.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce qu'un jet central est présent, lequel est dirigé perpendiculairement sur la fusion de fonte brute.
  10. Procédé selon l'une des revendications 2 à 9, caractérisé en ce qu'en plus du jet central, des jets périphériques sont présents, les directions des jets périphériques formant avec la direction du jet central, un angle d'au moins 6°, et de préférence d'au moins 8°.
  11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce qu'au moins un jet est alimenté en carburant.
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que l'air chaud est enrichi en oxygène, de préférence jusqu'à 40%.
  13. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que le procédé de soufflage est un procédé d'insufflation.
  14. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que le procédé de soufflage est un procédé de soufflage par le fond.
  15. Dispositif destiné à l'exécution d'un procédé selon l'une des revendications 1 à 14, comprenant un dispositif d'injection convenant à l'injection de jets d'air chaud dans un espace de convertisseur au-dessus d'une fusion de fonte brute dans le convertisseur, les jets d'air chaud quittant le dispositif d'injection par des buses, caractérisé en ce que les ouvertures de buses des buses présentent un écartement mutuel qui vaut au moins de 0,03 à 0,05 fois la longueur de course.
  16. Dispositif selon la revendication 16, caractérisé en ce qu'il y a au moins 3 ouvertures de buse.
  17. Dispositif selon la revendication 15 ou 16, caractérisé en ce que les axes longitudinaux des buses l'une avec l'autre formant un angle d'au moins 6°.
  18. Dispositif selon l'une des revendications 15 à 17, caractérisé en ce que l'écartement mutuel des ouvertures de buse est au moins aussi grand que le diamètre des ouvertures de buse.
  19. Dispositif selon l'une des revendications 15 à 18, caractérisé en ce qu'une buse centrale est présente.
  20. Dispositif selon la revendication 19, caractérisé en ce qu'en plus de la buse centrale, des buses périphériques sont présentes, les axes longitudinaux des buses périphériques formant avec l'axe longitudinal de la buse centrale un angle d'au moins 6°, et de préférence d'au moins 8°.
  21. Dispositif selon l'une des revendications 15 à 20, caractérisé en ce que le dispositif d'injection est une lance d'air chaud.
EP13799236.8A 2012-11-21 2013-11-21 Procédé de soufflage et dispositif de fabrication d'acier mettant en oeuvre des jets d'air chaud Active EP2922977B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012022703 2012-11-21
PCT/EP2013/074330 WO2014079907A1 (fr) 2012-11-21 2013-11-21 Procédé de soufflage et dispositif de fabrication d'acier mettant en œuvre des jets d'air chaud

Publications (2)

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EP2922977A1 EP2922977A1 (fr) 2015-09-30
EP2922977B1 true EP2922977B1 (fr) 2018-06-13

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US (1) US20150292050A1 (fr)
EP (1) EP2922977B1 (fr)
KR (1) KR20150086363A (fr)
CN (1) CN105008553A (fr)
IN (1) IN2015DN03809A (fr)
WO (1) WO2014079907A1 (fr)

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Publication number Priority date Publication date Assignee Title
KR101798844B1 (ko) * 2016-09-02 2017-11-17 주식회사 포스코 랜스 및 이를 이용한 조업 방법
CN110527778B (zh) * 2019-09-29 2021-10-26 山东钢铁股份有限公司 一种大型高性能炼钢转炉结构

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FR1467158A (fr) * 1965-12-14 1967-01-27 Siderurgie Fse Inst Rech Dispositif de réglage de débit de gaz
CN201660655U (zh) * 2010-02-08 2010-12-01 鞍钢股份有限公司 转炉高效氧枪喷头
DE102011006876A1 (de) * 2011-04-06 2012-10-11 Sms Siemag Ag Verfahren zum Betrieb mindestens einer Überschalldüse in einem metallurgischen Gefäß, Verfahren zur Ermittlung eines Druckverlusts, sowie System zum Ermitteln von Betriebsparametern mindestens einer Überschalldüse
KR101172900B1 (ko) * 2011-04-11 2012-08-10 주식회사 포스코건설 전로 고온공기 분사장치

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CN105008553A (zh) 2015-10-28
US20150292050A1 (en) 2015-10-15
KR20150086363A (ko) 2015-07-27
IN2015DN03809A (fr) 2015-10-02
WO2014079907A1 (fr) 2014-05-30
EP2922977A1 (fr) 2015-09-30

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