EP1636390A2 - Method and device for treating melt metals by means of a refining oxygen-based agent - Google Patents

Method and device for treating melt metals by means of a refining oxygen-based agent

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Publication number
EP1636390A2
EP1636390A2 EP04741571A EP04741571A EP1636390A2 EP 1636390 A2 EP1636390 A2 EP 1636390A2 EP 04741571 A EP04741571 A EP 04741571A EP 04741571 A EP04741571 A EP 04741571A EP 1636390 A2 EP1636390 A2 EP 1636390A2
Authority
EP
European Patent Office
Prior art keywords
oxygen
liquid oxygen
liquid
jet
gaseous
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.)
Granted
Application number
EP04741571A
Other languages
German (de)
French (fr)
Other versions
EP1636390B1 (en
Inventor
Paul Grohmann
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.)
Air Liquide Deutschland GmbH
Messer Group GmbH
Original Assignee
Messer Griesheim 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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to SI200431758T priority Critical patent/SI1636390T1/en
Priority to PL04741571T priority patent/PL1636390T3/en
Publication of EP1636390A2 publication Critical patent/EP1636390A2/en
Application granted granted Critical
Publication of EP1636390B1 publication Critical patent/EP1636390B1/en
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
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • 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
    • 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
    • C21C2250/00—Specific additives; Means for adding material different from burners or lances
    • C21C2250/04—Liquid gas
    • C21C2250/042—Liquid oxygen

Definitions

  • the invention relates to a method and a device for treating
  • Molten metals in particular molten steel, containing a fresh medium of oxygen.
  • a number of process designations are derived from the nature of the oxygen incorporation, e.g. the LD, LDAC or OBM process.
  • inflation methods such as the AOD method used with oxygen and e.g. Work argon.
  • the gaseous oxygen is supplied via a lance or a soil purging the pig iron or the base alloy for the reaction.
  • the invention has for its object to provide a method and apparatus for increasing the fresh speed.
  • liquid and gaseous oxygen are used for the refining of steels, the jet of liquid oxygen guided within the gaseous oxygen jet being applied to a bath surface of the molten metal already freed from the gaseous oxygen jet by the melt slag and / or introduced into the molten metal.
  • the oxygen entry according to the invention in steel fresh has - compared to the previous oxygen input - the significant advantage that the liquid oxygen comes into direct contact with the molten metal, whereby the oxygen - due to the prevailing in Bre ⁇ nfleck the molten metal high temperatures - abruptly evaporates, whereby an intensive bath movement is effected and an increased mass transfer in the molten metal - namely the oxidation, eg of the carbon to carbon monoxide, as well as the slagging of the pig iron adjuncts, e.g. Silicon and manganese - takes place.
  • the supply of the lance with gaseous oxygen is carried out in the usual way.
  • the execution of the lance tip can be designed as single or multi-point.
  • the supply of the lance with liquid oxygen takes place according to the state of
  • the lines leading the liquid or gaseous oxygen from the oxygen supply to the lance are designed as flexible hoses and the liquid oxygen line / s additionally vacuum-insulated.
  • the fresh process can be controlled by influencing the ratio of the entry amounts of gaseous and liquid oxygen and / or by influencing the gaseous or liquid oxygen pressure and the geometry of the blow nozzle used for the gaseous oxygen input with respect to a higher fresh speed.
  • the impact energy of the liquid oxygen can be influenced.
  • the liquid oxygen is introduced into the molten metal, in accordance with the prevailing flow conditions and the Reynolds number, either as a homogeneous liquid jet or as a droplet jet, or applied thereto.
  • the distance between the lance tip and the bath surface can be changed as in conventional lances.
  • the ratio of the amount of liquid and gaseous oxygen introduced by means of the blowing device according to the invention into a molten metal bath can be easily adapted to the respective operating conditions. There is a wide range of variation of almost 100% liquid oxygen and very low gaseous content and vice versa available.
  • the liquid oxygen jet (LOX) can also be fed intermittently to the bath surface. This can be done with larger diameters of the discharge - at the same mean mass flow -. As a result, a stable jet of liquid oxygen can be supplied to the molten bath.
  • a liquid oxygen supply preferably located in the lance axis.
  • the supply of liquid oxygen may be split into one or more holes.
  • liquid oxygen line other liquefied gases such. B. argon fed to the melt.
  • argon fed to the melt.
  • further metallurgical effects such as removal of unwanted gases or inclusions in the molten metal or an additional stirring effect for homogenizing the melt can be achieved.
  • the invention will be explained in more detail below with reference to an exemplary embodiment shown in the drawing (FIGS. 1 to 3).
  • Fig. 1 is a schematic representation of an oxygen blowing lance according to the invention
  • Figure 2 is a schematic representation of an oxygen supply with intercooling and with a for lance of a molten steel in a converter arranged lance with single-hole lance tip.
  • FIG. 3 shows a schematic representation of an oxygen lance with multi-hole lance tip according to the invention
  • Fig. 4 is a schematic representation of an oxygen supply
  • a gas phase separator and a blow lance with a multi-hole lance tip arranged for refining a steel melt in a converter
  • FIG. 1 shows a device which can be used to inject gaseous and liquid oxygen into a molten steel (not shown).
  • the oxygen blowing device consists of a blowing lance 1, via the supplied with a water cooling 2 inflow channel 3, gaseous oxygen (GOX) is fed through a discharge nozzle 4 as a gaseous oxygen jet 5 of the molten steel.
  • gaseous oxygen GOX
  • the erfi ⁇ dungssiee oxygen blowing device also has another, in the inflow 3 of the lance 1 ze ⁇ trisch arranged LOX lance 6, on their provided with a thermal insulation 7 inflow channel 8 deep cold liquid oxygen (LOX) through a discharge nozzle 9 as - from the gas jet 5 enveloped - Centric jet 10 liquid oxygen of the molten steel can be supplied.
  • the stream 10 of liquid oxygen supplied to the molten steel by the exhaust nozzle 9 of the LOX lance 6 as a centrifuge stream 10 of liquid oxygen strikes the surface of the molten steel freed from the slag by the gas jet 5 and evaporates as it penetrates into its Burn spot high temperatures having melt pool abruptly, whereby an intensive Badbewegu ⁇ g is effected and thus an increased mass transfer in the molten steel - namely the oxidation of the carbon to carbon monoxide, and the slagging of pig iron companion silicon and manganese - takes place.
  • the jet of liquid oxygen 10 is adapted to the respective flow conditions and the Reynolds number and can be supplied to the molten bath either as a homogeneous liquid jet or as a droplet jet.
  • the formation of the jet of liquid oxygen may be influenced by the degree of its supercooling.
  • the thermal insulation 7 preventing the premature evaporation of the liquid oxygen (LOX) flowing through the inflow channel 8 of the lance 6 consists of a conventional insulating material.
  • the jet 10 of liquid oxygen may also be fed intermittently to the molten steel.
  • a - formed in accordance with FIG. 1 - one-hole lance 11 is shown schematically, from which a - of a jet 5 gaseous oxygen umhüliter, centric jet of liquid oxygen 10 in the region of liberated from slag 12 liquid steel bath 13 of a converter fourteenth incident.
  • the feed of the liquid oxygen (LOX) used as a fresh medium from a liquid oxygen supply 15 into the one-hole blow lance 11 equipped with a cooling water connection 16 takes place through a line 17 designed as a flexible hose.
  • the supply of the gaseous oxygen (GOX) likewise used as a fresh medium takes place from a usual, unspecified oxygen gas supply in the lance 11 by a, advantageously designed as a flexible hose line 18th
  • the known from DE 43 15 342 C1 liquid oxygen supply 5 consists of a, equipped with conventional and therefore unspecified pipes and valves storage tank 19 for liquid oxygen.
  • the for the steel bath 13 of the arranged in the converter 14 single-hole lance 1 1 supplied liquid oxygen is removed from the insulated storage tank 19 through a line 20 and - if the pressure of the storage tank 9 is insufficient - after a shut-off valve 21 via a liquid oxygen pump 22 increases the required pressure and then introduced into a heat exchanger 23.
  • the conduit 20 may additionally be provided with a jacket (not shown in the drawing) with a cryogenic medium, for example liquid nitrogen, in order to prevent premature evaporation of the oxygen.
  • Heat exchanger 23 is passed from the insulated line 20 behind the shut-off valve 21 through an insulated line 24 branched oxygen via a controlled by a sensor 32 level control system 25 in the heat exchanger 23.
  • a negative pressure is generated by means of a pump 26, by which the boiling temperature of the liquid oxygen used as a coolant in the heat exchanger 23 is lowered so that it can serve as a coolant for the fresh oxygen.
  • the liquid oxygen used for refining the steel bath 13 in the converter 14 is passed through the heat exchanger 23 in copper coils 27 and thereby cooled by the cooling oxygen surrounding it - depending on the prevailing pressure ratio - below its boiling temperature determined by the pressure. Thereafter, the liquid fresh oxygen is supplied through the formed as an insulated tube line 17 of the arranged in the converter 14 one-hole blast nozzle 11 - and together with the supplied via the line 18 of the lance 11 gaseous oxygen - in the manner previously explained in the steel bath 13 of Converter 14 blown.
  • FIG. 3 shows a lance 1 with a three-hole lance tip, the embodiment of which basically corresponds to the blow law 1 described in FIG.
  • the blowing lance 1 described in FIG. 3 is designed such that both the liquid oxygen (LOX) and the gaseous oxygen (GOX) in the lance tip fall onto a plurality of partial beams - according to FIG - Divided into three sub-beams.
  • LOX liquid oxygen
  • GOX gaseous oxygen
  • the division of the gaseous oxygen is carried out from the inlet channel 3 for gaseous oxygen to the three located in the lance tip exhaust nozzles 4 for gaseous oxygen.
  • the division of the liquid oxygen is carried out by dividing the inflow channel 8 for liquid oxygen on three - not shown in Fig. 3 - inflow channels, which are each provided with a discharge nozzle 9 for liquid oxygen.
  • the discharge nozzle / n 4 of the lance 1 emanates the stream 10 of liquid oxygen and the jet of gaseous oxygen enveloping the stream 10 of liquid oxygen with a - customary for multi-hole lance tips - Inclination angle to the lance axis for refining the molten steel.
  • this angle is 25 °.
  • a, with your multi-hole lance tip in a converter 14 arranged multi-hole lance 28 is shown schematically, from which several, each of a beam 5 of gaseous oxygen enveloped, centric beams 10 liquid oxygen in the region of slag 12th liberated liquid steel bath 13 of the converter 14 impact.
  • the supply of the liquid oxygen (LOX) from a liquid oxygen supply 29 into the equipped with a cooling water connection 16 and with a multi-hole lance tip, arranged in the converter 14 multi-hole lance 28 takes place through the insulated line 17 in the form of a flexible hose.
  • the supply of the gaseous oxygen (GOX) from a customary and therefore unspecified oxygen gas supply into the multi-hole lance 28 takes place through the line 18.
  • the liquid oxygen (LOX) is supplied through the withdrawal line 20 via a check valve 21 through an insulated line 30 a gas phase 31.
  • a fill level control system 25 automatically keeps the liquid oxygen used in the gas phase separator 31 at the desired level, for which purpose the level of the liquid oxygen in the gas phase separator 31 is detected by means of a sensor 32.
  • the gaseous oxygen is separated from the liquid oxygen.
  • the liquid oxygen (LOX) is supplied via the formed as an insulated tube line 17 of the arranged in the converter 14 multi-hole lance 28 and by means of this - together with the supplied via line 18 gaseous oxygen - in a manner previously explained for the purpose of refining the steel bath thirteenth used in the converter 14.
  • the gaseous oxygen content resulting from the external introduction of heat into the liquid oxygen is separated by the gas phase separator 31 Multi-hole blowing nozzle 28 separated and fed via a - the level control system 25 containing - line 33 other unspecified consumers.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to a method and device for treating melt metals, in particular melt steels by means of a refining oxygen-based agent. The aim of said invention is to increase the performance of steel refining. For this purpose, a liquid oxygen jet enveloped with a gaseous oxygen jet is used.

Description

Verfahren und Vorrichtung zum Behandeln von Metallschmelzen mit einem Frischmittel aus SauerstoffMethod and apparatus for treating metal melts with a fresh medium of oxygen
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Behandeln vonThe invention relates to a method and a device for treating
Metallschmelzen, insbesondere Stahlschmelzen, mit einem Frischmittel aus Sauerstoff.Molten metals, in particular molten steel, containing a fresh medium of oxygen.
Es ist bekannt, zum Frischen von Stählen oxidierende Gase oder Gasgemische, insbesondere gasförmigen Sauerstoff, zu verwenden. Üblicherweise wird der Frischprozess in Konvertern durch Aufblasen oder Einblasen der Gase oder deren Kombination durchgeführt.It is known to use for refining steels oxidizing gases or gas mixtures, in particular gaseous oxygen. Usually, the refining process is carried out in converters by blowing or blowing in the gases or their combination.
Eine Reihe von Verfahrensbezeichnungen leiten sich aus der Art des Sauerstoffeinbringens ab, wie z.B. des LD-, LDAC- Verfahren oder der OBM-Prozeß. Darüber hinaus gibt es für legierte und hochlegierte Stähle Aufblasverfahren wie z. B. das AOD Verfahren, die mit Sauerstoff und z.B. Argon arbeiten. Dabei wird der gasförmige Sauerstoff über eine Lanze oder einen Bodenspülstein dem Roheisen oder der Basislegierung zur Reaktion zugeführt.A number of process designations are derived from the nature of the oxygen incorporation, e.g. the LD, LDAC or OBM process. In addition, for alloyed and high-alloyed steels there are inflation methods such. For example, the AOD method used with oxygen and e.g. Work argon. The gaseous oxygen is supplied via a lance or a soil purging the pig iron or the base alloy for the reaction.
Beim Frischen von Stählen mit gasförmigem Sauerstoff ergibt sich derzeit eine Blaszeit von 15 bis 18 min, um die im Roheisenbad enthaltenen Elemente wie beispielsweise Kohlenstoff, Silizium, Phosphor und Mangan zu oxidieren und damit das Roheisen bzw. Basislegierungen zu Stahl umzuwandeln.When refining steels with gaseous oxygen, there is currently a blowing time of 15 to 18 minutes in order to oxidize the elements contained in the pig iron bath, such as carbon, silicon, phosphorus and manganese, thus converting the pig iron or base alloys into steel.
Durch die DE 43 15 342 C1 ist weiterhin bekannt, beim Stahlschmelzen als Frischmittel flüssigen Sauerstoff als einphasige Flüssigkeit oder als Zweiphaseή-gemisch, bestehend aus Gas und Flüssigkeit, einzusetzen.From DE 43 15 342 C1 it is also known to use molten oxygen as a single-phase liquid or as a two-phase mixture consisting of gas and liquid in steel melting.
Bei diesem Verfahren wird der flüssige und gasförmige Sauerstoff jedoch in getrennten Strahlen auf das Bad geblasen. Der aus DE 43 15 342 C1 bekannte Sauerstoffeintrag beim Frischen von Stahl hat den wesentlichen Nachteil, dass der zum Verdrängen der Schlacke über dem Stahlbad verwendete Impuls des Gasstahles nicht für den flüssigen Sauerstoffstrahl genutzt werden kann. Der flüssige Sauerstoffstrahl prallt auf die Schlacke auf, verdampft dabei zu einem bedeutenden Teil, welcher für den Frischprozeß nicht mehr zur Verfügung steht.In this process, however, the liquid and gaseous oxygen are blown into the bath in separate jets. The well-known from DE 43 15 342 C1 oxygen input when refining steel has the significant disadvantage that the momentum used for displacing the slag over the steel bath of the gas jet can not be used for the liquid oxygen jet. The liquid oxygen jet impinges on the slag, evaporates to a significant part, which is no longer available for the refining process.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Erhöhen der Frischgeschwindigkeit zu schaffen.The invention has for its object to provide a method and apparatus for increasing the fresh speed.
Die Aufgabe wird erfindungsgemäß durch ein Verfahren und eine Vorrichtung mit den kennzeichnenden Merkmalen von Anspruch 1 und 10 gelöst.The object is achieved by a method and an apparatus having the characterizing features of claim 1 and 10.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous developments of the invention are specified in the subclaims.
Erfindungsgemäß wird flüssiger und gasförmiger Sauerstoff zum Frischen von Stählen eingesetzt, wobei der innerhalb des gasförmigen Sauerstoffstrahls geführte Strahl flüssigen Sauerstoffs auf eine, bereits von dem gasförmigen Sauerstoffstrahl von der Schmelzenschlacke befreite Badoberfläche der Metallschmelze aufgebracht und/oder in die Metallschmelze eingebracht wird.According to the invention, liquid and gaseous oxygen are used for the refining of steels, the jet of liquid oxygen guided within the gaseous oxygen jet being applied to a bath surface of the molten metal already freed from the gaseous oxygen jet by the melt slag and / or introduced into the molten metal.
Der erfindungsgemäße Sauerstoffeintrag beim Stahlfrischen weist - gegenüber dem bisherigen Sauerstoffeintrag - den wesentlichen Vorteil auf, dass der flüssige Sauerstoff direkt mit der Metallschmelze in Berührung kommt, wodurch der Sauer-stoff - auf Grund der in im Breπnfleck der Metallschmelze herrschenden hohen Temperaturen - schlagartig verdampft, wodurch eine intensive Badbewegung bewirkt wird und ein verstärkter Stoffaustausch in der Metallschmelze - nämlich die Oxidation, z.B. des Kohlenstoffs zu Kohlenmonoxid, sowie die Verschlackung der Roheisenbegleiter, z.B. Silizium und Mangan - stattfindet.The oxygen entry according to the invention in steel fresh has - compared to the previous oxygen input - the significant advantage that the liquid oxygen comes into direct contact with the molten metal, whereby the oxygen - due to the prevailing in Breπnfleck the molten metal high temperatures - abruptly evaporates, whereby an intensive bath movement is effected and an increased mass transfer in the molten metal - namely the oxidation, eg of the carbon to carbon monoxide, as well as the slagging of the pig iron adjuncts, e.g. Silicon and manganese - takes place.
Darüber hinaus wird in der Metallschmelze zusätzliche Oberfläche für den Stoffaustausch durch Bildung vieler kleiner Schlacke und Metalltröpfchen gebildet, wodurch die Raum-Zeit-Ausbeute beim Frischen von Stahl wesentlich verbessert und damit die Blasedauer deutlich verringert werden kann.In addition, in the molten metal additional surface for mass transfer is formed by the formation of many small slag and metal droplets, whereby the space-time yield when refining steel significantly improved and thus the blast time can be significantly reduced.
Durch den erfindungsgemäßen Sauerstoffeintrag beim Stahlfrischen kann die Durch- satzleistung von herkömmlichen Schmelzanlagen deutlich gesteigert werden.Due to the oxygen input according to the invention in the case of steel refining, the throughput of conventional melting plants can be significantly increased.
Die Versorgung der Blaslanze mit gasförmigem Sauerstoff erfolgt auf dem üblichen Wege. Die Ausführung der Lanzenspitze kann als Ein- oder Mehrlochspitze ausgeführt sein. Die Versorgung der Blaslanze mit flüssigem Sauerstoff erfolgt nach dem Stand derThe supply of the lance with gaseous oxygen is carried out in the usual way. The execution of the lance tip can be designed as single or multi-point. The supply of the lance with liquid oxygen takes place according to the state of
Technik, jedoch besonders vorteilhaft mittels einer aus der DE 43 15 343 C1 bekannten Vorrichtung.Technique, but particularly advantageous by means of a device known from DE 43 15 343 C1.
Dazu sind die den flüssigen oder gasförmigen Sauerstoff von der Sauerstoff-versorgung zur Blaslanze führenden Leitungen als flexible Schläuche ausgebildet und die Flüssigsauerstoff-Leitung/en zusätzlich vakuum-isoliert.For this purpose, the lines leading the liquid or gaseous oxygen from the oxygen supply to the lance are designed as flexible hoses and the liquid oxygen line / s additionally vacuum-insulated.
Der Frischprozess kann durch die Beeinflussung des Verhältnisses der Eintragsmengen an gasförmigem und flüssigem Sauerstoff und/oder durch die Beeinflussung des gasförmigen oder flüssigen Sauerstoffdruckes sowie der Geometrie der für den gasförmigen Sauerstoffeintrag eingesetzten Blasdüse bezüglich einer höheren Frischgeschwindigkeit gesteuert werden.The fresh process can be controlled by influencing the ratio of the entry amounts of gaseous and liquid oxygen and / or by influencing the gaseous or liquid oxygen pressure and the geometry of the blow nozzle used for the gaseous oxygen input with respect to a higher fresh speed.
Des Weiteren kann durch Variation des Flüssigsauerstoffdruckes und der Düsengeometrie die Auftreffenergie des flüssigen Sauerstoffs beeinflusst werden. Furthermore, by varying the liquid oxygen pressure and the nozzle geometry, the impact energy of the liquid oxygen can be influenced.
Erfindungsgemäß wird der flüssige Sauerstoff entsprechend der herrschenden Strömungsverhältnisse und der Reynoldszahl - entweder als homogener Flüssigkeitsstrahl oder als Tröpfchenstrahl - in die Metallschmelze eingebracht, oder auf diese aufgebracht.According to the invention, the liquid oxygen is introduced into the molten metal, in accordance with the prevailing flow conditions and the Reynolds number, either as a homogeneous liquid jet or as a droplet jet, or applied thereto.
Der Abstand zwischen der Lanzenspitze und der Badoberfläche kann wie bei herkömmlichen Blaslanzen verändert werden.The distance between the lance tip and the bath surface can be changed as in conventional lances.
Das Verhältnis der mittels der erfindungemaßen Blasvorrichtung in ein metallisches Schmelzbad eingetragenen Menge an flüssigem und gasförmigem Sauerstoff kann problemlos den jeweiligen Betriebsbedingungen angepasst werden. Dabei steht eine weite Variationsbreite von nahezu 100% flüssigem Sauerstoff und sehr geringem gasförmigem Anteil und umgekehrt zur Verfügung.The ratio of the amount of liquid and gaseous oxygen introduced by means of the blowing device according to the invention into a molten metal bath can be easily adapted to the respective operating conditions. There is a wide range of variation of almost 100% liquid oxygen and very low gaseous content and vice versa available.
Der flüssige Sauerstoff-Strahl (LOX) kann auch intermittierend der Badoberfläche zugeführt werden. Dazu kann mit größeren Durchmessern der Ausströmöffnung - bei gleichem mittlerem Massenstrom - gearbeitet werden. Dadurch kann ein stabiler Strahl aus flüssigem Sauerstoff dem Schmelzbad zugeführt werden.The liquid oxygen jet (LOX) can also be fed intermittently to the bath surface. This can be done with larger diameters of the discharge - at the same mean mass flow -. As a result, a stable jet of liquid oxygen can be supplied to the molten bath.
Als erfindungsgemäße Sauerstoff-Blaslanze sind herkömmlichen Ein- oder Mehrloch- Lanzenspitzen einsetzbar. Jedoch ist bei einer Einloch-Lanzenspitze eine vorzugsweise in der Lanzenachse befindliche Zuführung für Flüssigsauerstoff vorgesehen. Bei einer Mehrloch-Lanzenspitze kann die Zuführung von Flüssigsauerstoff auf ein oder mehrere Löcher aufgeteilt sein.Conventional single or multi-hole lance tips can be used as the oxygen lance according to the invention. However, in a single-hole lance tip, there is provided a liquid oxygen supply preferably located in the lance axis. In a multi-hole lance tip, the supply of liquid oxygen may be split into one or more holes.
Darüber hinaus ist es möglich durch die Flüssigsauerstoffleitung andere verflüssigte Gase wie z. B. Argon der Schmelze zuzuführen. Durch die bereits beschriebene intensive Badbewegung können weitere metallurgische Effekte wie z.B. Entfernen von in der Metallschmelze unerwünschten Gasen oder Einschlüssen oder ein zusätzlicher Rühreffekt zur Homogenisierung der Schmelze erzielt werden. Nachfolgend wird die Erfindung anhand eines in der Zeichnung (Fig. 1 bis 3) dargestellten Ausführungsbeispiels näher erläutert.In addition, it is possible by the liquid oxygen line other liquefied gases such. B. argon fed to the melt. By the already described intensive bath movement further metallurgical effects such as removal of unwanted gases or inclusions in the molten metal or an additional stirring effect for homogenizing the melt can be achieved. The invention will be explained in more detail below with reference to an exemplary embodiment shown in the drawing (FIGS. 1 to 3).
Es zeigen:Show it:
Fig. 1 eine schematische Darstellung einer erfindungsgemäßen Sauerstoff-Blaslanze;Fig. 1 is a schematic representation of an oxygen blowing lance according to the invention;
Fig. 2 eine schematische Darstellung einer Sauerstoffversorgung mit Zwischenkühlung und mit einer zum Frischen einer Stahlschmelze in einem Konverter angeordneten Blaslanze mit Einloch-Lanzenspitze;Figure 2 is a schematic representation of an oxygen supply with intercooling and with a for lance of a molten steel in a converter arranged lance with single-hole lance tip.
Fig. 3 eine schematische Darstellung einer erfindungsgemäßen Sauerstoff-Blaslanze mit Mehrloch-Lanzenspitze;3 shows a schematic representation of an oxygen lance with multi-hole lance tip according to the invention;
Fig. 4 eine schematische Darstellung einer Sauerstoffversorgung mitFig. 4 is a schematic representation of an oxygen supply with
Gasphasenabscheider und mit einer zum Frischen einer Stahlschmelze in einem Konverter angeordneten Blaslanze mit Mehrloch-Lanzenspitze.A gas phase separator and a blow lance with a multi-hole lance tip arranged for refining a steel melt in a converter.
In der Fig.1 ist eine zum Einblasen von gasförmigem und flüssigem Sauerstoff in eine - bildlich nicht dargestellte - Stahlschmelze einsetzbare Vorrichtung dargestellt.FIG. 1 shows a device which can be used to inject gaseous and liquid oxygen into a molten steel (not shown).
Die erfindungsgemäße Sauerstoff-Blasvorrichtung besteht aus einer Blaslanze 1 , über deren mit einer Wasserkühlung 2 ummantelten Zuströmkanal 3, gasförmiger Sauerstoff (GOX) durch eine Ausströmdüse 4 als gasförmiger Sauerstoff-Strahl 5 der Stahlschmelze zugeführt wird.The oxygen blowing device according to the invention consists of a blowing lance 1, via the supplied with a water cooling 2 inflow channel 3, gaseous oxygen (GOX) is fed through a discharge nozzle 4 as a gaseous oxygen jet 5 of the molten steel.
Die erfiπdungsgemäße Sauerstoff-Blasvorrichtung weist zudem eine weitere, im Zuströmkanal 3 der Blaslanze 1 zeπtrisch angeordnete LOX-Lanze 6 auf, über deren mit einer Wärmeisolierung 7 versehenen Zuströmkanal 8 tief kalter flüssiger Sauerstoff (LOX) durch eine Ausströmdüse 9 als - vom Gasstrahl 5 umhüllter - zentrischer Strahl 10 flüssigen Sauerstoffs der Stahlschmelze zugeführt werden kann. Der durch die Ausströmdüse 4 der Blaslanze 1 als Strahl 5 gasförmigen Sauerstoffs auf die Oberfläche der in einem Konverter befindlichen Stahlschmelze auftreffende Gasstrahl 5 durchdringt mittels seiner Impulsenergie die auf der Stahlschmelze befindliche Schlacke, wodurch im Auftreffbereich des gasförmigen Sauerstoff-Strahls 5 die Oberfläche der Stahlschmelze von der Schlacke befreit und in der Stahlschmelze Oxidatioπsreaktionen bewirkt werden.The erfiπdungsgemäße oxygen blowing device also has another, in the inflow 3 of the lance 1 zeπtrisch arranged LOX lance 6, on their provided with a thermal insulation 7 inflow channel 8 deep cold liquid oxygen (LOX) through a discharge nozzle 9 as - from the gas jet 5 enveloped - Centric jet 10 liquid oxygen of the molten steel can be supplied. The gas jet 5 impinging on the surface of the molten steel located in a converter through the discharge nozzle 4 of the lance 1 penetrates the slag on the molten steel by means of its pulse energy, whereby the surface of the molten steel of the slag is released and caused in the molten steel Oxidatioπsreaktionen.
Der durch die Ausströmdüse 9 der LOX-Lanze 6 als - vom Gasstrahl 5 umhüllter - zentrischer Strahl 10 flüssigen Sauerstoffs der Stahlschmelze zugeführte Strahl 10 trifft auf die, vom Gasstrahl 5 von der Schlacke befreite Oberfläche der Stahlschmelze und verdampft bei seinem Eindringen in das in seinem Brennfleck hohe Temperaturen aufweisende Schmelzbad schlagartig, wodurch eine intensive Badbeweguπg bewirkt wird und damit ein verstärkter Stoffaustausch in der Stahlschmelze - nämlich die Oxidation des Kohlenstoffs zu Kohlenmonoxid, sowie die Verschlackung der Roheisenbegleiter Silizium und Mangan - stattfindet.The stream 10 of liquid oxygen supplied to the molten steel by the exhaust nozzle 9 of the LOX lance 6 as a centrifuge stream 10 of liquid oxygen strikes the surface of the molten steel freed from the slag by the gas jet 5 and evaporates as it penetrates into its Burn spot high temperatures having melt pool abruptly, whereby an intensive Badbeweguπg is effected and thus an increased mass transfer in the molten steel - namely the oxidation of the carbon to carbon monoxide, and the slagging of pig iron companion silicon and manganese - takes place.
Der Strahl 10 flüssigen Sauerstoffs wird den jeweiligen Strömungsverhältnissen und der Reynoldszahl angepasst und kann entweder als homogener Flüssigkeitsstrahl oder als Tröpfchenstrahl dem Schmelzbad zugeführt werden.The jet of liquid oxygen 10 is adapted to the respective flow conditions and the Reynolds number and can be supplied to the molten bath either as a homogeneous liquid jet or as a droplet jet.
Die Ausbildung des Strahls 10 flüssigen Sauerstoffs kann durch den Grad seiner Unterkühlung beeinflusst werden.The formation of the jet of liquid oxygen may be influenced by the degree of its supercooling.
Die das vorzeitige Verdampfen des den Zuströmkanal 8 der Blaslanze 6 durch- fließenden flüssigen Sauerstoffs (LOX) verhindernde Wärmeisolierung 7 besteht aus aus einem üblichen Isolationsmaterial .The thermal insulation 7 preventing the premature evaporation of the liquid oxygen (LOX) flowing through the inflow channel 8 of the lance 6 consists of a conventional insulating material.
Der Strahl 10 flüssigen Sauerstoffs kann auch intermittierend der Stahlschmelze zugeführt werden. In Fig. 2 ist eine - gemäß Fig. 1 ausgebildete - Einloch-Blaslanze 11 schematisch dargestellt, aus welcher ein - von einem Strahl 5 gasförmigen Sauerstoffs umhüliter, zentrischer Strahl flüssigen Sauerstoffs 10 im Bereich des von Schlacke 12 befreiten flüssigen Stahlbads 13 eines Konverters 14 auftrifft. Die Zufuhr des als Frischmittel eingesetzten flüssigen Sauerstoffs (LOX) von einer Flüssigsauerstoff-Versorgung 15 in die mit einem Kühlwasseranschluss 16 ausgerüstete Einloch-Blaslanze 11 erfolgt durch eine als flexibler Schlauch ausgebildete Leitung 17. Die Zufuhr des ebenfalls als Frischmittel eingesetzten gasförmigen Sauerstoffs (GOX) erfolgt von einer üblichen, nicht näher bezeichneten Sauerstoffgas- Versorgung in die Blaslanze 11 durch eine, vorteilhaft als flexibler Schlauch ausgebildeten Leitung 18.The jet 10 of liquid oxygen may also be fed intermittently to the molten steel. In Fig. 2 a - formed in accordance with FIG. 1 - one-hole lance 11 is shown schematically, from which a - of a jet 5 gaseous oxygen umhüliter, centric jet of liquid oxygen 10 in the region of liberated from slag 12 liquid steel bath 13 of a converter fourteenth incident. The feed of the liquid oxygen (LOX) used as a fresh medium from a liquid oxygen supply 15 into the one-hole blow lance 11 equipped with a cooling water connection 16 takes place through a line 17 designed as a flexible hose. The supply of the gaseous oxygen (GOX) likewise used as a fresh medium takes place from a usual, unspecified oxygen gas supply in the lance 11 by a, advantageously designed as a flexible hose line 18th
Die aus der DE 43 15 342 C1 bekannte Flüssigsauerstoff-Versorgung 5 besteht aus einem, mit üblichen und daher nicht näher bezeichneten Rohrleitungen und Ventilen ausgerüsteten Speicherbehälter 19 für flüssigen Sauerstoff. Der zum Frischen des Stahlbads 13 der im Konverter 14 angeordneten Einloch-Blaslanze 1 1 zugeführte flüssige Sauerstoff wird aus dem isolierten Speicherbehälter 19 durch eine Leitung 20 entnommen und - falls der Druck des Speicherbehälters 9 nicht ausreicht - nach einem Absperrventil 21 über eine Flüssigsauerstoffpumpe 22 auf den erforderlichen Druck erhöht und danach in einen Wärmeaustauscher 23 eingeleitet. Die Leitung 20 kann zusätzlich mit einer - in der Zeichnung nicht dargestellten - Ummantelung mit einem kryogenen Medium, beispielsweise Flüssigstickstoff versehen sein, um ein vorzeitiges Verdampfen des Sauerstoffs zu verhindern.The known from DE 43 15 342 C1 liquid oxygen supply 5 consists of a, equipped with conventional and therefore unspecified pipes and valves storage tank 19 for liquid oxygen. The for the steel bath 13 of the arranged in the converter 14 single-hole lance 1 1 supplied liquid oxygen is removed from the insulated storage tank 19 through a line 20 and - if the pressure of the storage tank 9 is insufficient - after a shut-off valve 21 via a liquid oxygen pump 22 increases the required pressure and then introduced into a heat exchanger 23. The conduit 20 may additionally be provided with a jacket (not shown in the drawing) with a cryogenic medium, for example liquid nitrogen, in order to prevent premature evaporation of the oxygen.
Zum Kühlen des als Frischmittel eingesetzten flüssigen Sauerstoffs in demFor cooling the liquid oxygen used as the refining agent in the
Wärmeaustauscher 23 wird von der isolierten Leitung 20 hinter dem Absperrventil 21 durch eine isolierte Leitung 24 abgezweigter Sauerstoff über ein mittels eines Fühlers 32 geregelten Füllstandsregelungssystem 25 in den Wärmeaustauscher 23 geleitet. Im Innern des Wärmeaustauschers 23 wird mittels einer Pumpe 26 ein solcher Unterdruck erzeugt, durch den die Siedetemperatur des als Kühlmittel im Wärmeaustauscher 23 eingesetzten flüssigen Sauerstoffs so gesenkt wird, dass dieser als Kühlmittel für den Frischsauerstoff dienen kann. Durch die Wahl des Unterdrucks kann die Temperaturdifferenz des Kühlsauerstoffes zum Frischsauerstoff und somit das Maß der Verhinderung der vorzeitigen Verdampfung des Flüssigsauerstoffs zum Frischen bestimmt werden.Heat exchanger 23 is passed from the insulated line 20 behind the shut-off valve 21 through an insulated line 24 branched oxygen via a controlled by a sensor 32 level control system 25 in the heat exchanger 23. In the interior of the heat exchanger 23, such a negative pressure is generated by means of a pump 26, by which the boiling temperature of the liquid oxygen used as a coolant in the heat exchanger 23 is lowered so that it can serve as a coolant for the fresh oxygen. By choosing the negative pressure, the Temperature difference of the cooling oxygen to the fresh oxygen and thus the degree of prevention of premature evaporation of the liquid oxygen to be determined fresh.
Der zum Frischen des Stahlbads 13 im Konverter 14 eingesetzte flüssige Sauerstoff wird in Kupferwendeln 27 durch den Wärmeaustauscher 23 geführt und dabei von dem ihn umgebenden Kühlsauerstoff - je nach vorliegendem Druckverhältnis - unter seine durch den Druck bestimmte Siedetemperatur gekühlt. Danach wird der flüssige Frischsauerstoff durch die als isolierter Schlauch ausgebildete Leitung 17 der in dem Konverter 14 angeordneten Einloch-Blasdüse 11 zugeführt - und zusammen mit dem über die Leitung 18 der Blaslanze 11 zugeführten gasförmigen Sauerstoff - in der vorab erläuterten Weise in das Stahlbad 13 des Konverters 14 eingeblasen.The liquid oxygen used for refining the steel bath 13 in the converter 14 is passed through the heat exchanger 23 in copper coils 27 and thereby cooled by the cooling oxygen surrounding it - depending on the prevailing pressure ratio - below its boiling temperature determined by the pressure. Thereafter, the liquid fresh oxygen is supplied through the formed as an insulated tube line 17 of the arranged in the converter 14 one-hole blast nozzle 11 - and together with the supplied via the line 18 of the lance 11 gaseous oxygen - in the manner previously explained in the steel bath 13 of Converter 14 blown.
In Fig. 3 ist eine Blaslanze 1 mit einer Dreiloch-Lanzenspitze dargestellt, deren Ausführungsform grundsätzlich der in Fig. 1 beschriebenen Blaslaπze 1 entspricht.FIG. 3 shows a lance 1 with a three-hole lance tip, the embodiment of which basically corresponds to the blow law 1 described in FIG.
Im Unterschied zu der in Fig. 1 beschriebenen Blaslanze 1 ist die in Fig. 3 beschriebene Blaslanze 1 derart ausgebildet, dass sowohl der flüssige Sauerstoff (LOX) als auch der gasförmige Sauerstoff (GOX) in der Lanzenspitze auf mehrere Teilstrahlen - gemäß Fig. 3 - in drei Teilstrahlen aufgeteilt wird.In contrast to the blowing lance 1 described in FIG. 1, the blowing lance 1 described in FIG. 3 is designed such that both the liquid oxygen (LOX) and the gaseous oxygen (GOX) in the lance tip fall onto a plurality of partial beams - according to FIG - Divided into three sub-beams.
Die Aufteilung des gasförmigen Sauerstoffs erfolgt aus dem Zuströmkanal 3 für gasförmigen Sauerstoff auf die drei in der Lanzenspitze befindlichen Ausströmdüsen 4 für gasförmigen Sauerstoff.The division of the gaseous oxygen is carried out from the inlet channel 3 for gaseous oxygen to the three located in the lance tip exhaust nozzles 4 for gaseous oxygen.
Die Aufteilung des flüssigen Sauerstoffs erfolgt durch die Aufteilung des Zuström-kanals 8 für flüssigen Sauerstoff auf drei - in Fig. 3 nicht gezeigte - Zuströmkanäle, die jeweils mit einer Ausströmdüse 9 für flüssigen Sauerstoff versehen sind.The division of the liquid oxygen is carried out by dividing the inflow channel 8 for liquid oxygen on three - not shown in Fig. 3 - inflow channels, which are each provided with a discharge nozzle 9 for liquid oxygen.
Wie weiterhin in Fig. 3 gezeigt, entströmen der Ausströmdüse/n 4 der Blaslanze 1 der Strahl 10 flüssigen Sauerstoffs und der den Strahl 10 flüssigen Sauerstoffs umhüllende Strahl 5 gasförmigen Sauerstoffs mit einem - für Mehrloch-Lanzen-spitzen üblichen - Neigungswinkel zur Lanzenachse zum Frischen der Stahlschmelze. Bei der in Fig. 3 dargestellten Blaslanze 1 beträgt dieser Winkel 25°.As further shown in FIG. 3, the discharge nozzle / n 4 of the lance 1 emanates the stream 10 of liquid oxygen and the jet of gaseous oxygen enveloping the stream 10 of liquid oxygen with a - customary for multi-hole lance tips - Inclination angle to the lance axis for refining the molten steel. In the case of the blowing lance 1 shown in FIG. 3, this angle is 25 °.
In Fig. 4 ist eine, mit Ihrer Mehrloch-Lanzenspitze in einem Konverter 14 ange-ordnete Mehrloch-Blaslanze 28 schematisch dargestellt, aus welcher mehrere, jeweils von einem Strahl 5 gasförmigen Sauerstoffs umhüllte, zentrische Strahlen 10 flüssigen Sauerstoffs im Bereich des von Schlacke 12 befreiten flüssigen Stahlbads 13 des Konverters 14 auftreffen. Die Zufuhr des flüssigen Sauerstoffs (LOX) aus einer Flüssigsauerstoff-Versorgung 29 in die mit einem Kühlwasseranschluss 16 und mit einer Mehrloch-Lanzenspitze ausgerüsteten, in dem Konverter 14 angeordneten Mehrloch- Blaslanze 28 erfolgt durch die isolierte Leitung 17 in Form eines flexiblen Schlauchs. Die Zufuhr des gasförmigen Sauerstoffs (GOX) von einer üblichen und daher nicht näher bezeichneten Sauerstoffgas-Versorgung in die Mehrloch-Blaslanze 28 erfolgt durch die Leitung 18.In Fig. 4, a, with your multi-hole lance tip in a converter 14 arranged multi-hole lance 28 is shown schematically, from which several, each of a beam 5 of gaseous oxygen enveloped, centric beams 10 liquid oxygen in the region of slag 12th liberated liquid steel bath 13 of the converter 14 impact. The supply of the liquid oxygen (LOX) from a liquid oxygen supply 29 into the equipped with a cooling water connection 16 and with a multi-hole lance tip, arranged in the converter 14 multi-hole lance 28 takes place through the insulated line 17 in the form of a flexible hose. The supply of the gaseous oxygen (GOX) from a customary and therefore unspecified oxygen gas supply into the multi-hole lance 28 takes place through the line 18.
Aus dem - gemäß Fig. 2 ausgebildeten - Speicherbehälter 19 der Flüssigsauerstoff- Versorgung 29 wird der flüssige Sauerstoff (LOX) durch die Entnahmeleitung 20 über ein Absperrventil 21 durch eine isolierte Leitung 30 einem Gasphasenabscheider 31 zugeführt. Ein Füllstandsregelungssystem 25 hält den zum Frischen eingesetzten flüssigen Sauerstoff im Gasphasenabscheider 31 automatisch auf dem gewünschten Niveau, wozu mittels eines Fühlers 32 der Füllstand des flüssigen Sauerstoffs im Gasphasenabscheider 31 erfasst wird.From the - formed in accordance with FIG. 2 - storage tank 19 of the liquid oxygen supply 29, the liquid oxygen (LOX) is supplied through the withdrawal line 20 via a check valve 21 through an insulated line 30 a gas phase 31. A fill level control system 25 automatically keeps the liquid oxygen used in the gas phase separator 31 at the desired level, for which purpose the level of the liquid oxygen in the gas phase separator 31 is detected by means of a sensor 32.
In dem Gasphasenabscheider 31 wird der gasförmige Sauerstoff von dem flüssigen Sauerstoff getrennt. Der flüssige Sauerstoff (LOX) wird über die als isolierter Schlauch ausgebildete Leitung 17 der in dem Konverter 14 angeordneten Mehrloch-Blaslanze 28 zugeführt und mittels dieser - zusammen mit dem über die Leitung 18 zugeführten gasförmigen Sauerstoff - in vorab erläuterter Weise zum Frischen des Stahlbads 13 im Konverter 14 eingesetzt.In the gas phase separator 31, the gaseous oxygen is separated from the liquid oxygen. The liquid oxygen (LOX) is supplied via the formed as an insulated tube line 17 of the arranged in the converter 14 multi-hole lance 28 and by means of this - together with the supplied via line 18 gaseous oxygen - in a manner previously explained for the purpose of refining the steel bath thirteenth used in the converter 14.
Der durch äußeren Wärmeeintrag in den flüssigen Sauerstoff entstehende gasförmige Sauerstoffanteil wird durch den Gasphasenabscheider 31 vor der Mehrloch-Blasdüse 28 separiert und über eine - das Füllstandsregelungssystem 25 enthaltenden - Leitung 33 anderen, nicht näher bezeichneten Verbrauchern zugeführt.The gaseous oxygen content resulting from the external introduction of heat into the liquid oxygen is separated by the gas phase separator 31 Multi-hole blowing nozzle 28 separated and fed via a - the level control system 25 containing - line 33 other unspecified consumers.
Dem zum Frischen von Stahl eingesetzten flüssigen und gasförmigen Sauerstoff können bei Bedarf auch andere Medien, wie z.B. Argon oder Feststoffe, beigefügt werden. If necessary, other media, such as argon or solids, may be added to the liquid and gaseous oxygen used to refine steel.
Bezugszeichenreference numeral
1 Blaslaπze (GOX + LOX)1 blow job (GOX + LOX)
2 Wasserkühlung2 water cooling
3 Zuströmkanal (GOX) 4 Ausströmdüse (GOX)3 inflow channel (GOX) 4 outlet nozzle (GOX)
5 Strahl (GOX)5 beam (GOX)
6 LOX-Lanze6 LOX lance
7 Wärmeisolierung7 heat insulation
8 Zuströmkanal (LOX) 9 Ausströmdüse (LOX)8 inflow channel (LOX) 9 outlet nozzle (LOX)
10 Strahl (LOX)10 beam (LOX)
11 Einloch-Blaslanze11 one-hole lance
12 Schlacke12 slag
13 Stahlbad 14 Konverter13 steel bath 14 converter
15 Flüssigsauerstoff-Versorgung (LOX)15 Liquid Oxygen Supply (LOX)
16 Kühlwasseranschluss16 cooling water connection
17 LOX Leitung (Schlauch)17 LOX pipe (hose)
18 GOX Leitung (Schlauch) 19 Speicherbehälter (LOX)18 GOX pipe (hose) 19 storage tank (LOX)
20 Leitung (LOX)20 line (LOX)
21 Absperrventil21 shut-off valve
22 Flüssigsauerstoffpumpe22 liquid oxygen pump
23 Wärmeaustauscher 24 Leitung23 heat exchanger 24 pipe
25 Füllstandsregelungssystem25 level control system
26 Pumpe26 pump
27 Kupferwendeln27 copper coils
28 Mehrloch-Blaslanze 29 Flüssigsauerstoff-Versorgung (LOX)28 Multi-hole lance 29 Liquid oxygen supply (LOX)
30 Leitung (LOX)30 line (LOX)
31 Gasphasenabscheider 32 Fühler 33 Leitung (GOX) 31 gas phase separator 32 sensor 33 line (GOX)

Claims

Patentansprüche claims
1. Verfahren zum Behandeln von Metallschmelzen, insbesondere Stahlschmelzen, mit einem Frischmittel aus Sauerstoff, dadurch gekennzeichnet, dass ein von einem Strahl1. A method for treating molten metal, in particular molten steel, with a fresh means of oxygen, characterized in that one of a beam
(5) gasförmigen Sauerstoffs umhüliter Strahl (10) flüssigen Sauerstoffs verwendet wird.(5) gaseous oxygen sheath jet (10) liquid oxygen is used.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass ein von einem Strahl (5) gasförmigen Sauerstoffs konzentrisch umhüliter Strahl (10) flüssigen Sauerstoffs eingesetzt wird.2. The method according to claim 1, characterized in that one of a jet (5) of gaseous oxygen concentrically umhüliter beam (10) liquid oxygen is used.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Strahlen (5, 10) gasförmigen und flüssigen Sauerstoffs mit gleicher Geschwindigkeit eingesetzt werden.3. The method according to claim 1, characterized in that the jets (5, 10) of gaseous and liquid oxygen are used at the same speed.
4. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Strahlen (5, 10) gasförmigen und flüssigen Sauerstoffs mit unterschiedlichen Geschwindigkeiten eingesetzt werden.4. The method according to claim 1, characterized in that the jets (5, 10) of gaseous and liquid oxygen are used at different speeds.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Strahl (10) flüssigen Sauerstoffs als kompakter Strahl eingesetzt wird.5. The method according to any one of claims 1 to 4, characterized in that the beam (10) of liquid oxygen is used as a compact beam.
6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Strahl (10) flüssigen Sauerstoffs als in Tröpfchen aufgelöster Strahl eingesetzt wird.6. The method according to any one of claims 1 to 4, characterized in that the jet (10) liquid oxygen is used as dissolved in droplets jet.
7. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Strahl (10) flüssigen Sauerstoffs kontinuierlich eingesetzt wird.7. The method according to any one of claims 1 to 4, characterized in that the jet (10) of liquid oxygen is used continuously.
8. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Strahl (10) flüssigen Sauerstoffs intermittierend eingesetzt wird. 8. The method according to any one of claims 1 to 4, characterized in that the jet (10) of liquid oxygen is used intermittently.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass anstelle von flüssigem Sauerstoff andere verflüssigte Gase, vorzugsweise Argon flüssig, zur Reinigung und Homogenisierung der Metallschmelze verwendet werden.9. The method according to any one of claims 1 to 8, characterized in that instead of liquid oxygen other liquefied gases, preferably liquid argon, are used for the purification and homogenization of the molten metal.
10. Vorrichtung zum Behandeln von Metallschmelzen, insbesondere Stahlschmelzen, mit einer Blaslanze, bei der gasförmiger Sauerstoff aus einer Gasversorgung über einen Zuströmkanal zu mindestens einer Ausströmdüse geführt wird, und mit mindestens einer an einer Flüssiggasversorgung angeschlossene Ausströmdüse für flüssigen Sauerstoff, dadurch gekennzeichnet, dass die Ausströmdüse (9) für flüssigen Sauerstoff derart angeordnet ist, dass beim bestimmungsgemäßen Einsatz der Blaslanze (1 ) der der Ausströmdüse (9) entströmende Strahl (10) flüssigen Sauerstoffs innerhalb des einer Ausströmdüse (4) für gasförmigen Sauerstoff entströmenden Gasstrahls (5) vorliegt.10. An apparatus for treating molten metal, in particular molten steel, with a lance, is conducted in the gaseous oxygen from a gas supply via an inflow channel to at least one exhaust nozzle, and at least one connected to a liquid gas discharge nozzle for liquid oxygen, characterized in that the Outlet nozzle (9) for liquid oxygen is arranged such that during normal use of the lance (1) of the Ausströmdüse (9) emanating jet (10) of liquid oxygen within the Ausströmdüse (4) for gaseous oxygen escaping gas jet (5) is present.
11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Ausströmdüse/n (9) für flüssigen Sauerstoff jeweils innerhalb eines Zuströmkanals (3) für gasförmigen Sauerstoff angeordnet ist/sind.11. The device according to claim 10, characterized in that the Ausströmdüse / n (9) is arranged for liquid oxygen in each case within an inflow channel (3) for gaseous oxygen / are.
12. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Ausströmdüsen (4, 9) für gasförmigen bzw. flüssigen Sauerstoff konzentrisch zueinander angeordnet sind.12. The device according to claim 10, characterized in that the discharge nozzles (4, 9) are arranged for gaseous or liquid oxygen concentric to each other.
13. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Flüssigzuleituπg (17) mit einer kryogenen Kühlung ausgerüstet ist.13. The apparatus according to claim 10, characterized in that the Flüssigkeitszuleituπg (17) is equipped with a cryogenic cooling.
14. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass die Flüssigzuleitung (17) als Schlauchverbindung ausgestaltet ist.14. The apparatus according to claim 13, characterized in that the liquid feed line (17) is designed as a hose connection.
15. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Blaslanze (1) eine Kühleinrichtung, vorzugsweise eine Wasserkühlung (2) aufweist. 15. The apparatus according to claim 10, characterized in that the blowing lance (1) has a cooling device, preferably a water cooling (2).
16. Vorrichtung nach Anspruch 15, dadurch gekennzeichnet, dass die Kühleinrichtung radial außen in der Blaslanze (1 ) angeordnet ist.16. The apparatus according to claim 15, characterized in that the cooling device is arranged radially outward in the lance (1).
17. Vorrichtung nach einem der Ansprüche 10 bis 16, gekennzeichnet durch eine Steuereinrichtung zur Einstellung oder Regelung der Menge, der Fließgeschwindig-keit und/oder der Temperatur des eingetragenen flüssigen und/oder gasförmigen Sauerstoffs. 17. Device according to one of claims 10 to 16, characterized by a control device for adjusting or regulating the amount, the flow rate and / or the temperature of the introduced liquid and / or gaseous oxygen.
EP04741571A 2003-05-23 2004-05-13 Method for treating melt metals by means of a refining oxygen-based agent Expired - Lifetime EP1636390B1 (en)

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DE10323826A DE10323826A1 (en) 2003-05-23 2003-05-23 Method and device for treating molten metals, in particular molten steel, with a fresh medium of oxygen
PCT/EP2004/050800 WO2004104231A2 (en) 2003-05-23 2004-05-13 Method and device for treating melt metals by means of a refining oxygen-based agent

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Publication number Publication date
DE10323826A1 (en) 2005-01-05
EP1636390B1 (en) 2011-07-06
PL1636390T3 (en) 2011-12-30
WO2004104231A2 (en) 2004-12-02
WO2004104231A3 (en) 2005-03-03
SI1636390T1 (en) 2012-01-31
ATE515581T1 (en) 2011-07-15
ES2369362T3 (en) 2011-11-29

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