WO1989001982A1 - Process and device for minimizing process gas consumption in metallurgical processes - Google Patents

Process and device for minimizing process gas consumption in metallurgical processes Download PDF

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Publication number
WO1989001982A1
WO1989001982A1 PCT/DE1988/000464 DE8800464W WO8901982A1 WO 1989001982 A1 WO1989001982 A1 WO 1989001982A1 DE 8800464 W DE8800464 W DE 8800464W WO 8901982 A1 WO8901982 A1 WO 8901982A1
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WIPO (PCT)
Prior art keywords
gas
pressure
pressure fluctuations
frequency
temperature
Prior art date
Application number
PCT/DE1988/000464
Other languages
German (de)
French (fr)
Inventor
Horst Kappes
Original Assignee
Mannesmann 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
Priority claimed from DE19873728526 external-priority patent/DE3728526C1/en
Priority claimed from DE19873735835 external-priority patent/DE3735835A1/en
Application filed by Mannesmann Ag filed Critical Mannesmann Ag
Priority to JP88506167A priority Critical patent/JPH02504651A/en
Publication of WO1989001982A1 publication Critical patent/WO1989001982A1/en

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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
    • C21C5/35—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
    • C21C5/30—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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • 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
    • C21C2250/02—Hot oxygen
    • 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
    • C21C2250/06—Hollow electrode

Definitions

  • the invention relates to a method for minimizing the
  • Pages 537 to 579 scientifically examined the basis for the design of nozzles for blowing gas into melts and indicated that it is necessary for the practical implementation of such methods for introducing gas to be able to set a range between a minimum and a maximum gas flow .
  • a minimum mass flow of gas must of course not be undercut, because otherwise the feed pipe or the nozzle will clog.
  • the interpretation rule known from the cited reference provides that a
  • the amount of oxygen required is determined by the melt size and mainly by the carbon to be removed.
  • the required oxygen flow is then determined by the timing, which e.g. is determined by the arc furnace. This defines the nozzle geometry because, as described, work is carried out in an area that is limited at the top and bottom.
  • a device which could extend the control range of the nozzle to smaller mass flows would thus lead to significant cost savings.
  • the object of the invention is now not only to combine clogging of the supply line for gases such as argon, oxygen or nitrogen, which ends below the liquid level, but also to minimize the consumption of these gases.
  • the value of the speed of sound a f ⁇ RT (, R; constants) changes proportionally YT, but the speed of the gas increases proportionally T with a constant mass flow, the speed of sound at a temperature T_> T, with a mass flow rh" ⁇ m., so that the nozzle at temperature T_ can be kept free with a reduced mass flow compared to that at T. But even during an active purging or treatment time, heating the gas is advantageous.
  • the nozzle cross-section and operating pressure of the gas stand for one Certain mode of operation of the purge gas in a certain ratio to one another and are designed for a maximum supply of the gas.
  • the control range is very narrow. By heating the gas according to the invention, the control range can be easily expanded by extending the control range downwards.
  • the process gas to be heated can be passed through a heat exchanger before being introduced into the liquid metal, in which its temperature, depending on the possibilities, is heated to several hundred degrees above the ambient temperature.
  • a heat exchanger When blowing gas into melts, savings in increasing the gas temperature to about 500 degrees C from 35% to 5% are achieved.
  • Pressure fluctuations are used to check the minimum permissible process gas flow.
  • the invention now makes use of the knowledge that the easily detectable pressure fluctuations in the inner tube can be used to minimize gas consumption.
  • Process was a pressure sensor attached to the inner tube of the gas supply nozzle. The pressure fluctuations caused by the formation and tearing off of individual bubbles were thus recognized.
  • the pressure fluctuations are strong enough to be recorded and processed as a signal.
  • the signal reliably shows the pressure fluctuations. It is therefore possible to control the gas flow control valve with the aid of this signal so that the gas flow is steadily reduced from a starting value until a threshold value of the pressure fluctuations is exceeded. After that it will
  • the valve is opened by a certain amount and the cycle starts again.
  • the pressure sensor can be connected at any location if a pressure line, which may be filled with a liquid, is led from the nozzle pipe to the pressure sensor.
  • Limit value can be recognized based on the pressure fluctuations caused by bubbling.

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

Abstract

In the process described, gases such as argon, oxygen or nitrogen are blown into melts through a supply pipe consisting of an inner and a concentric outer pipe, which ends below the liquid level. The gas is heated before introduction into the melt. Also described is a device for carrying out the process.

Description

VERFAHREN UND VORRICHTUNG ZUR MINIMIERUNG DER PROZESSGASVERBRAUCHES BEI METALLURGISCHEN PROZESSEN METHOD AND DEVICE FOR MINIMIZING PROCESS GAS CONSUMPTION IN METALLURGICAL PROCESSES
Die Erfindung betrifft ein Verfahren zur Minimierung desThe invention relates to a method for minimizing the
Prozeßgasverbrauches bei metallurgischen Prozessen, bei denen Gase wie Argon, Sauerstoff, Luft, und dergl., in Schmel durch eine unterhalb des Flüssigkeitsspiegels endende, aus einem Innen- und einem dazu konzentrischen Außenrohr be¬ stehende Zuleitung eingeblasen werden.Process gas consumption in metallurgical processes in which gases such as argon, oxygen, air and the like are blown into melt through a feed line which ends below the liquid level and consists of an inner pipe and an outer pipe concentric therewith.
In den letzten Jahren haben sich eine Fülle von Anwendungs¬ fällen für Verfahren der eingangs genannten Art ergeben.In the past few years, there has been an abundance of applications for processes of the type mentioned at the beginning.
Dementsprechend sind auch Untersuchungen durchgeführt worden, deren Ziel es war, Hinweise für die Minimierung des Haupt- und Spülgasverbrauches zu geben, weil der Gasverbrauch bei derartigen Verfahren selbstverständlich von ausschlaggebenderAccordingly, studies have also been carried out, the aim of which was to provide information for minimizing the main and purge gas consumption, because the gas consumption in such processes is of course of decisive importance
Bedeutung für die Wirtschaftlichkeit des Verfahrens ist.It is important for the economy of the process.
So wird beispielsweise in "Steel Research 55 (1984)", Heft 12,For example, in "Steel Research 55 (1984)", No. 12,
Seite 537 bis 579, wissenschaftlich die Grundlage für die Auslegung von Düsen zum Gaseinblasen in Schmelzen unter¬ sucht und darauf hingewiesen, daß es für die praktische Durchführung derartiger Verfahren zur Gaseinleitung erforder¬ lich ist, einen Bereich zwischen einem minimalen und maximalen Gasstrom einstellen zu können. Ein minimaler Massenstrom von Gas darf selbstverständlich nicht unter¬ schritten werden, weil sich sonst das Zuleitungsrohr bzw. die Düse zusetzt. Die nach der genannten Literaturstelle bekannte Auslegungsvorschrift sieht vor, daß einPages 537 to 579, scientifically examined the basis for the design of nozzles for blowing gas into melts and indicated that it is necessary for the practical implementation of such methods for introducing gas to be able to set a range between a minimum and a maximum gas flow . A minimum mass flow of gas must of course not be undercut, because otherwise the feed pipe or the nozzle will clog. The interpretation rule known from the cited reference provides that a
Mindestvolumenstrom durch Ringspalt und Düse geblasen werden muß, so daß sich in den Austrittsquerschnitten gerade dieMinimum volume flow must be blown through the annular gap and nozzle, so that just in the outlet cross-sections
Schallgeschwindigkeit als Austrittsgeschwindigkeit einstellt. Damit wird es möglich, am Düsenaustritt einen Druck einzu¬ stellen, der größer als der ferrostatische Druck des Metallbades ist. Ein Zulaufen der Düsen ist daher unmöglich. Bisher wird in den Fachkreisen einhellig die Meinung vertreten, daß Gas bei Prozessen der hier interessierendenSets the speed of sound as the exit speed. This makes it possible to set a pressure at the nozzle outlet which is greater than the ferrostatic pressure of the metal bath. It is therefore impossible for the nozzles to close. So far, experts have unanimously held the opinion that gas is used in processes of those who are interested
Art in Form eines Strahles und nicht in Form von Blasen in das Bad eindringen sollte. Dabei wird die Grenze für den Übergang von bubbling zu jetting spätestens bei Erreichen der Schallgeschwindigkeit erreicht.Kind in the form of a jet and not in the form of bubbles should penetrate the bathroom. The limit for the transition from bubbling to jetting is reached at the latest when the speed of sound is reached.
In diesem Zusammenhang ist aber auch zu berücksichtigen, daß bei der Erzeugung von z.B. Edelstahl im Konverter technisches Gas wie Argon, Sauerstoff oder Stickstoff in erheblichen Mengen verbraucht wird.In this context, it should also be borne in mind that when generating e.g. Stainless steel in the converter technical gas such as argon, oxygen or nitrogen is consumed in considerable quantities.
Die benötigte Sauerstoffmenge wird durch die Schmelzen¬ größe und hauptsächlich durch den zu entfernenden Kohlen¬ stoff bestimmt.The amount of oxygen required is determined by the melt size and mainly by the carbon to be removed.
Der benötigte Sauerstoffström wird dann durch den Zeittakt, der z.B. vom Lichtbogenofen vorgegeben wird, bestimmt. Damit ist die Düsengeometrie festgelegt, da, wie beschrieben, in einem Bereich gearbeitet wird, der nach oben und unten begrenzt ist.The required oxygen flow is then determined by the timing, which e.g. is determined by the arc furnace. This defines the nozzle geometry because, as described, work is carried out in an area that is limited at the top and bottom.
Das bedeutet jedoch, daß auch die teuren Inertgase, vor allem Argon, mit der durch die Düsengeometrie festgelegten Min.-Menge ins Bad geleitet werden müssen, auch wenn die metallurgische Arbeit, die durch das Einleiten verrichtet werden soll, mit kleineren Mengen erreicht werden kann.However, this means that even the expensive inert gases, especially argon, have to be led into the bath with the minimum amount determined by the nozzle geometry, even if the metallurgical work which is to be carried out by the introduction can be achieved with smaller amounts .
Somit würde eine Vorrichtung, die den Regelbereich der Düse zu kleineren Maεsenströmen hin ausdehnen könnte, zu deutlichen Kosteneinsparungen führen. Der Erfindung liegt nun die Aufgabe zugrunde, nicht nur ein Zusetzen der unterhalb des Flüssigkeitsspiegels endenden Zuleitung für Gase wie Argon, Sauerstoff oder Stickstoff zu verbinden, sondern auch den Verbrauch von diesen Gasen zu minimieren.A device which could extend the control range of the nozzle to smaller mass flows would thus lead to significant cost savings. The object of the invention is now not only to combine clogging of the supply line for gases such as argon, oxygen or nitrogen, which ends below the liquid level, but also to minimize the consumption of these gases.
Gelöst wird diese Aufgabe erfindungsgemäß mit den Merkmalen im Kennzeichen des Anspruchs 1.This object is achieved according to the invention with the features in the characterizing part of claim 1.
In Anwendung des bekannten physikalischen Gesetzes, daß sich das Volumen eines Gases proportional zu dessen Temperatur verhält, ist es möglich, den Prozeßgasverbrauch bis ca. auf die Hälfte des bisherigen und möglicherweise noch darunter zu senken. Hier zeigen sich nun die beson¬ deren Vorteile der Erfindung. Für das Freihalten der Düsen bzw. Gasaustrittsöffnungen ist nur eine Gasmenge erforderlich, die einen Gasstrom in Form eines Gasstrahles erzeugt, wofür nicht der "Massenstrom", sondern das Erreichen der Schallge¬ schwindigkeit an der Düsenspitze verantwortlich zeichnet. Applying the well-known physical law that the volume of a gas is proportional to its temperature, it is possible to reduce the process gas consumption to about half of the previous one and possibly even less. Here are the particular advantages of the invention. To keep the nozzles or gas outlet openings free, only a quantity of gas is required which generates a gas stream in the form of a gas jet, for which it is not the “mass flow” but the achievement of the speed of sound at the nozzle tip that is responsible.
Da "sich der Wert der Schallgeschwindigkeit a = f^RT ( , R; Konstanten) proportional YT verändert, die Geschwindigkeit des Gases bei konstantem Massenstrom jedoch proportional T wächst, wird die Schallgeschwindigkeit bei einer Temperatur T_ > T, bei einem Massenstrom rh„ < m. erreicht, so daß die Düse bei der Temperatur T_ mit einem verminderten Massenstrom gegenüber dem bei T, freigehalten werden kann. Aber selbst während einer aktiven Spül- oder Behandlungszeit ist das Erwärmen des Gases von Vorteil. Düsenquerschnitt und Betriebsdruck des Gases stehen für eine bestimmte Wirkungsweise des Spülgases in einem bestimmten Verhältnis zueinander und sind auf ein Maximalangebot des Gases ausgelegt. Der Regelbereich ist hierbei sehr eng begrenzt. Durch das erfindungsgemäße Erwärmen des Gases läßt sich in einfacher Weise der Regelbereich erweitern, indem der Regelbereich nach unten ausgedehnt wird.Since "the value of the speed of sound a = f ^ RT (, R; constants) changes proportionally YT, but the speed of the gas increases proportionally T with a constant mass flow, the speed of sound at a temperature T_> T, with a mass flow rh" < m., so that the nozzle at temperature T_ can be kept free with a reduced mass flow compared to that at T. But even during an active purging or treatment time, heating the gas is advantageous. The nozzle cross-section and operating pressure of the gas stand for one Certain mode of operation of the purge gas in a certain ratio to one another and are designed for a maximum supply of the gas. The control range is very narrow. By heating the gas according to the invention, the control range can be easily expanded by extending the control range downwards.
Für die Aufheizung des Prozeßgases stehen in einem Schmelzbetrieb für Metall ohne weiteres genügend Wärmequellen zur Verfügung, die womöglich anderweitig kaum ausgenutzt werden. So kann das aufzuheizende Prozeßgas vor dem Einleiten in das flüssige Metall durch einen Wärmetauscher geleitet werden, in welchem seine Temperatur, je nach den Möglichkeiten, auf mehrere hundert Grad über die Umgebungstemperatur aufgeheizt wird. Beim Gaseinblasen in Schmelzen ergeben sich Einsparungen bei Erhöhung der Gastemperatur auf etwa 500 Grad C von 35?ό bis 5ü% .Sufficient heat sources are readily available for heating the process gas in a smelting operation for metal, which heat sources may not be used otherwise. Thus, the process gas to be heated can be passed through a heat exchanger before being introduced into the liquid metal, in which its temperature, depending on the possibilities, is heated to several hundred degrees above the ambient temperature. When blowing gas into melts, savings in increasing the gas temperature to about 500 degrees C from 35% to 5% are achieved.
Ausgestaltungen ergeben sich aus den Merkmalen der Ansprüche 2 und 3. Von besonderem Vorteil ist die kombinierte Maßnahme nach Anspruch 4.Refinements result from the features of claims 2 and 3. The combined measure according to claim 4 is particularly advantageous.
Zusätzlich werden bei diesem erfindungsgemäßen Verfahren die als nachteilig angesehenen, beim bubbling auftretendenIn addition, in this method according to the invention, those which are considered disadvantageous and occur in bubbling
Druckschwankungen zur Überprüfung des minimal zulässigen Prozeßgasstromes verwendet.Pressure fluctuations are used to check the minimum permissible process gas flow.
Die Erfindung macht sich nun die Erkenntnis zunutze, daß die gut erfaßbaren Druckschwankungen im Innenrohr zur Minimierung des Gasverbrauchs verwendet werden können.The invention now makes use of the knowledge that the easily detectable pressure fluctuations in the inner tube can be used to minimize gas consumption.
Bei der praktischen Ausführung des erfindungsgemäßenIn the practical implementation of the invention
Verfahrens wurde an dem Innenrohr der Gaszuführdüse ein Druckaufnehmer angebracht. Damit wurden die Druckschwan¬ kungen, die durch Bilden und Abreißen einzelner Blasen entstehen, erkannt.Process was a pressure sensor attached to the inner tube of the gas supply nozzle. The pressure fluctuations caused by the formation and tearing off of individual bubbles were thus recognized.
Die Druckschwankungen sind stark genug, um sie aufzeichnen und als Signal weiterverarbeiten zu können. Das Signal zeigt zuverlässig die Druckschwankungen an. Daher ist es möglich, das Regelventil für den Gasstrom mit Hilfe dieses Signals so zu steuern, daß der Gasstrom von einem Startwert aus stetig verringert wird, bis ein Schwellwert der Druckschwankungen überschritten wird. Danach wird dasThe pressure fluctuations are strong enough to be recorded and processed as a signal. The signal reliably shows the pressure fluctuations. It is therefore possible to control the gas flow control valve with the aid of this signal so that the gas flow is steadily reduced from a starting value until a threshold value of the pressure fluctuations is exceeded. After that it will
Ventil um einen bestimmten Betrag geöffnet und der Zyklus beginnt von neuem.The valve is opened by a certain amount and the cycle starts again.
Mit dieser erfindungsgemäßen Regelung paßt sich der minimaleWith this regulation according to the invention, the minimum fits
Gasstrom an alle bestimmenden Parameter an, nämlich die Verschleißkurve der Ausmauerung, der Temperatur und demGas flow to all determining parameters, namely the wear curve of the lining, the temperature and the
Inhalt des metallurgischen Gefäßes, sowie hauptsächlich an die eingestellte Temperatur des einzuleitenden Gases. An apparativer Ausstattung ist zusätzlich nur ein Druck¬ aufnehmer und ein Frequenzfilter erforderlich. Der Druckaufnehmer kann an einem beliebigen Ort ange¬ schlossen werden, wenn eine Druckleitung, die evtl. mit einer Flüssigkeit gefüllt ist, von dem Düsenrohr bis zum Druckaufnehmer geführt wird.Contents of the metallurgical vessel, as well as mainly to the set temperature of the gas to be introduced. Only one pressure transducer and one frequency filter are required for equipment. The pressure sensor can be connected at any location if a pressure line, which may be filled with a liquid, is led from the nozzle pipe to the pressure sensor.
Bei der praktischen Erprobung des erfindungsgemäßen Ver¬ fahrens wurden die Gasdurchsätze unabhängig voneinander in Ringspalt und Düse soweit reduziert, bis nachteilige Auswirkungen auftraten oder zu erwarten waren. Dabei wurde festgestellt, daß bei einem Volumenstrom von weniger als 1,75 m N/min ein vollständiges Freihalten der Innendüse nicht möglich war, wenn die Temperatur des einzuleitenden Gases nicht erhöht wurde. Wie erwartet, konnte dieserIn the practical testing of the method according to the invention, the gas throughputs in the annular gap and nozzle were reduced independently of one another until adverse effects occurred or were to be expected. It was found that at a volume flow rate of less than 1.75 m N / min it was not possible to keep the inner nozzle completely free unless the temperature of the gas to be introduced was raised. As expected, this one
Grenzwert anhand der Druckschwankungen, die durch das bubbling verursacht werden, erkannt werden. Limit value can be recognized based on the pressure fluctuations caused by bubbling.

Claims

Patentansprüche Claims
1. Verfahren zur Minimierung des Prozeßgasverbrauches bei metallurgischen Prozessen, bei denen Gase wie Argon,1. Method for minimizing process gas consumption in metallurgical processes in which gases such as argon,
Sauerstoff oder Stickstoff in Schmelzen durch eine unterhalb des Flüssigkeitsspiegels endende, aus einemOxygen or nitrogen in melts from one ending below the liquid level
Innen- und einem dazu konzentrischen Außenrohr bestehenden Zuleitung eingeblasen werden, d a d u r c h g e k e n n z e i c h n e t, daß das Gas vor dem Einleiten aufgeheizt wird.Inside and a concentric outer pipe existing supply line are blown in, so that the gas is heated before being introduced.
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß das Gas auf eine Temperatur von mehreren hundert Grad über die Umgebungstemperatur aufgeheizt wird.2. The method according to claim 1, that the gas is heated to a temperature of several hundred degrees above the ambient temperature.
3. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß das Gas auf eine Temperatur von ca. 500 C aufgeheizt wird.3. The method of claim 1, d a d u r c h g e k e n n z e i c h n e t that the gas is heated to a temperature of about 500 C.
4. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, dap man zusätzlich die Druckschwankungen das Gases, vorzugs¬ weise im Innenrohr der Zuleitung, ermittelt, diese als Signale einer Frequenzfilterung unterzieht, bei der der oszillierende Anteil der Druckschwankungen herausgefiltert wird, und daß man das die Druckεchwankungen anzeigende Signal zur Steuerung des Gasstromes hinsichtlich der minimal benötigten Menge verwendet. 4. The method according to claim 1, characterized in that one additionally determines the pressure fluctuations of the gas, preferably in the inner tube of the feed line, which is subjected to frequency filtering as signals in which the oscillating portion of the pressure fluctuations is filtered out, and that the pressure fluctuations indicating signal used to control the gas flow with respect to the minimum amount required.
5. Verfahren nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t, daß der Gasstrom von einem Startwert aus stetig bis zu einem Schwellwert verringert wird, und daß dann der Gasstrom um einen vorgegebenen Betrag vermehrt und der Vorgang erneut eingeleitet wird.5. The method of claim 4, d a d u r c h g e k e n n z e i c h n e t that the gas flow from a starting value is steadily reduced to a threshold value, and that the gas flow is then increased by a predetermined amount and the process is initiated again.
6. Verfahren nach Anspruch 4 und/oder 5, d a d u r c h g e k e n n z e i c h n e t, daß man die Frequenz der Druckschwankungen im Gaszuleitungsrohr in einem vorgängigen Versuch ermittelt und die Frequenzfilterung der ermittelten Druckschwankungsfrequenz anpaßt.6. The method according to claim 4 and / or 5, d a d u r c h g e k e n n e e c h n e t that one determines the frequency of the pressure fluctuations in the gas supply pipe in a previous experiment and the frequency filtering of the determined pressure fluctuation frequency adapts.
7. Verfahren nach den Ansprüchen 4 bis 6, d a d u r c h g e k e n n z e i c h n e t, daß man das bei der Frequenzfilterung ermittelte Signal verstärkt und aus ihm einen Mittelwert bildet.7. The method according to claims 4 to 6, d a d u r c h g e k e n n z e i c h n e t that the signal determined in the frequency filtering is amplified and an average value is formed from it.
8. Vorrichtung zur Durchführung des Verfahrens nach den Ansprüchen 1 bis 7, g e k e n n z e i c h n e t d u r h einen Druckaufnehmer, der den Gasdruck in der in die Mtellschmelze führenden Leitung ermittelt und einen8. An apparatus for performing the method according to claims 1 to 7, g e k e n n z e i c h n e t d u r h a pressure sensor that determines the gas pressure in the line leading into the melt and one
Frequenzfilter, der den oszillierenden Anteil desFrequency filter, which the oscillating part of the
Gasdrucks herausfiltert und einen Mittelwert derFiltered out gas pressure and an average of
Druckschwankungen als Steuergröße einem Regelventil für das Prozeßgas zuführt. Pressure fluctuations as a control variable supplies a control valve for the process gas.
PCT/DE1988/000464 1987-08-24 1988-07-22 Process and device for minimizing process gas consumption in metallurgical processes WO1989001982A1 (en)

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JP88506167A JPH02504651A (en) 1987-08-24 1988-07-22 How to minimize process gas consumption in metallurgical processes

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DEP3728526.2 1987-08-24
DE19873728526 DE3728526C1 (en) 1987-08-24 1987-08-24 Method for minimising the process gas consumption in metallurgical processes
DEP3735835.9 1987-10-20
DE19873735835 DE3735835A1 (en) 1987-10-20 1987-10-20 Method of reducing the consumption of process gas

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EP0723022A1 (en) * 1995-01-23 1996-07-24 Linde Aktiengesellschaft Process for treating of metal melts by a treating gas being considerately cooled down under environment temperature

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Publication number Priority date Publication date Assignee Title
JP5236905B2 (en) * 2007-07-18 2013-07-17 東京窯業株式会社 Ladle

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GB1062591A (en) * 1962-07-04 1967-03-22 Internat Meehanite Metal Compa Improvements in or relating to the treatment of metals
FR2401453A1 (en) * 1977-08-26 1979-03-23 British Steel Corp CONTROL AND REGULATION PROCESS
EP0045658A1 (en) * 1980-08-06 1982-02-10 British Steel Corporation Gas inlet orifice monitoring
EP0227952A1 (en) * 1985-11-26 1987-07-08 Sumitomo Metal Industries, Ltd. Method of controlling the stirring strength and flow rate of a jet of gas blown through a lance onto a molten metal surface

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Publication number Priority date Publication date Assignee Title
DE1165627B (en) * 1953-11-18 1964-03-19 Gutehoffnungshuette Sterkrade Method and device for treating molten iron
GB1062591A (en) * 1962-07-04 1967-03-22 Internat Meehanite Metal Compa Improvements in or relating to the treatment of metals
FR2401453A1 (en) * 1977-08-26 1979-03-23 British Steel Corp CONTROL AND REGULATION PROCESS
EP0045658A1 (en) * 1980-08-06 1982-02-10 British Steel Corporation Gas inlet orifice monitoring
EP0227952A1 (en) * 1985-11-26 1987-07-08 Sumitomo Metal Industries, Ltd. Method of controlling the stirring strength and flow rate of a jet of gas blown through a lance onto a molten metal surface

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EP0723022A1 (en) * 1995-01-23 1996-07-24 Linde Aktiengesellschaft Process for treating of metal melts by a treating gas being considerately cooled down under environment temperature

Also Published As

Publication number Publication date
EP0377597A1 (en) 1990-07-18
ES2010323A6 (en) 1989-11-01
JPH02504651A (en) 1990-12-27

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