EP0271580B1 - Method of torch guniting of metallurgical plant - Google Patents

Method of torch guniting of metallurgical plant Download PDF

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Publication number
EP0271580B1
EP0271580B1 EP86906033A EP86906033A EP0271580B1 EP 0271580 B1 EP0271580 B1 EP 0271580B1 EP 86906033 A EP86906033 A EP 86906033A EP 86906033 A EP86906033 A EP 86906033A EP 0271580 B1 EP0271580 B1 EP 0271580B1
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EP
European Patent Office
Prior art keywords
flame
oxygen
guniting
gunite
acoustic vibrations
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP86906033A
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German (de)
French (fr)
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EP0271580A4 (en
EP0271580A1 (en
Inventor
Mikhail Vasilievich Malakhov
Albert Nikolaevich Ivoditov
Jury Ivanovich Zhavoronkov
Viktor Albertovich Breido
Izrail Abramovich Juzefovsky
Igor Pavlovich Tsibin
Alexandr Alexandrovich Shershnev
Oleg Nikolaevich Chemeris
Nina Pavlovna Chernova
Vyacheslav Fedorovich Badakh
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VSESOJUZNY GOSUDARSTVENNY INSTITUT NAUCHNO-ISSLEDO
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VSESOJUZNY GOSUDARSTVENNY INSTITUT NAUCHNO-ISSLEDOVATELSKIKH I PROEKTNYKH RABOT OGNEUPORNOI PROMYSHLENNOSTI
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Publication of EP0271580A1 publication Critical patent/EP0271580A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
    • B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
    • B05B7/205—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0692—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by a fluid
    • 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
    • C21C5/44—Refractory linings
    • C21C5/441—Equipment used for making or repairing linings
    • C21C5/443—Hot fettling; Flame gunning
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
    • F27D1/1647—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen
    • F27D1/1652—Flame guniting; Use of a fuel
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0021—Devices for monitoring linings for wear
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
    • F27D1/1647—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen
    • F27D1/1652—Flame guniting; Use of a fuel
    • F27D2001/1657—Solid fuel

Definitions

  • the present invention relates to the metallurgical industry and relates in particular to methods for flame retarding a metallurgical aggregate.
  • a method for goal-locking the refractory lining of a metallurgical unit in which a goal-residue mass is directed in a flame jet over a nozzle onto the refractory lining and an electric constant field is generated between the nozzle and the refractory lining (certificate of origin No. 334464, issued in US Pat USSR and published on 30.03.82 in the bulletin "Discoveries, inventions, utility models and trademarks", No. 12).
  • the particles in the gate flame are charged with the same charge and during the production of the coating, the repulsive forces of the charge of the same name partially take effect, which leads to a lower density of the gate coating compared to the refractory basic lining and consequently to one leads to reduced durability of the door liner.
  • a flame spray device with rocket accelerators is known from EP-A-0052821.
  • a method for flame retarding the lining of a metallurgical unit in which a flame retardant flame consisting of forcretant, fuel and oxygen is directed onto the fire-resistant lining and the flame retardant flame simultaneously with an energetic wave field with an oscillation frequency of 1.0 to 20 kHz is acted on.
  • the energetic wave field propagates throughout the entire internal volume of the unit and acts on the door's torch flame (copyright notice No. 768819, issued in the USSR and published on October 7, 1980 in the bulletin "Discoveries, Inventions, Utility Models and Trademarks", No. 37 ).
  • the wave energy of the field is distributed over the entire internal volume of the unit and a relatively small part of it acts on the door locking flame.
  • the combustion and heat exchange processes in it are not intense enough, as a result of which the fuel particles do not burn completely during the flight time, penetrate into the coating to be applied and burn on its over surface or in it, which in turn leads to an increased porosity of the Goal liner cover and thus result in its lower durability.
  • An increase in the power of the source of the energy field to a value at which the intensification is sufficiently high is impossible due to a harmful field effect on the unit and the operating personnel.
  • the invention has for its object to provide such a method for flame retarding a metallurgical unit, in which the wave action on the goal retardant flame is such that a complete combustion of the fuel particles during their flight time in the goal retarding flame ensures and consequently the durability of the goal retardant coating is increased.
  • the energetic wave field by acoustic in a method for flame retarding a metallurgical unit in which a door torch flame consisting of gate residue mass, fuel and oxygen is directed onto the refractory lining of the unit and acted on it with an energetic wave field Vibrations are generated, where they are maximally concentrated in the gate flame and the acoustic vibrations are generated with an oxygen jet which is directed along the geometric axis of the gate flame and is passed through an ultrasonic whistle.
  • the acoustic shrinkage is generated with two oxygen jets which lie on the opposite sides of the geometric axis of the gate flame, each of them at an angle of max. Is directed 50 ° to this axis and is let through by ultrasonic peening.
  • the gate flame is particularly fully captured by them.
  • the acoustic vibrations are applied with a field intensity of not less than 100 dB.
  • the method according to the invention for flame retarding a metallurgical aggregate makes it possible to greatly increase the durability of the door retort coating with cheaper and simplest means.
  • the method for flame retarding a metallurgical aggregate consists in that a flame retardant flame 3 is directed onto the refractory lining 1 (FIG. 1) of a metallurgical aggregate (not shown) from a blow mold 2 and, at the same time, an energetic field is exerted on this retort flame 3 is generated by acute vibrations "a", these vibrations being maximally concentrated on the gate flame.
  • the blow mold 2 contains a pipeline 4 for the supply of a gate residue with a fuel, a pipeline 5 for the oxygen supply and a pipeline 6 for a coolant, which are arranged coaxially.
  • the pipeline 4 is provided with a nozzle 7 for supplying the gate residue with fuel and the pipeline 5 with a nozzle 8 for supplying oxygen.
  • the nozzle 8 consists of an ultrasound whistle 9 (FIG. 2) and a sound funnel 10.
  • the acoustic vibrations are generated by an oxygen jet which passes along the geometric axis "b" (FIG. 1) of the gate flame the ultrasonic whistle 9 (FIG. 2) flows out.
  • the acoustic vibrations are generated by two oxygen jets which are passed through ultrasonic whistles 11 (FIG. 1), which on the opposite sides of the geometric axis "b" of the gate flame 3 at an angle "a 'of max. 50 °
  • the ultrasonic whistle 11 is essentially similar to the whistle 9, but with an undivided middle part, because the garbage mass flows under the fuel through the nozzle 7 and the main amount of oxygen through the nozzle 12.
  • the method according to the invention for flame retardation was tested on converters in a metallurgical plant. A normal two-component gate secret compound, which contained a refractory and a fuel component, was used for the gate locking. The gate locking was carried out in the vertical position of the converter.
  • the blow mold 2 was placed in the Converter introduced and d
  • the supply of the garbage paste via the nozzle 7 and the oxygen via the nozzle 12 is switched on.
  • the additional oxygen jets were supplied via the ultrasonic pipes 11 arranged on the two sides of the nozzles 7 and 12.
  • the oxygen jets When flowing through the whistle 11, the oxygen jets cause the acoustic oscillations to oscillate, which are directed at an angle of 30 ° to the axis "b" of the gate flame 3.
  • a high-quality door chalk coating is applied to the door chimney flame with the concentrated acoustic vibrations with a field intensity of not less than 100 dB; the wear rate of the coating applied by the process according to the invention is twice as low as the wear rate of the coatings applied by the known processes. From the table it can be seen that the coating is applied particularly effectively under the influence of the acoustic vibrations with an intensity of 140 to 165 dB.
  • the present invention can be used particularly effectively in the repair of the lining of converters, arc beam melting furnaces, Siemens Martin furnaces, pans and other steel melting units in the hot state.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Combustion & Propulsion (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Discharge Heating (AREA)
  • Application Of Or Painting With Fluid Materials (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)

Abstract

A method for torch guniting of a metallurgical unit, wherein a guniting force formed by a guniting mix, fuel and oxygen is directed into the refractory lining of the unit involved. Simultaneously the guniting torch is exposed in the effect of a wave energy field which is established by virtue of sonic vibrations which are maximally concentrated at the guniting torch.

Description

Gebiet der TechnikTechnical field

Die vorliegende Erfindung bezieht sich auf die metallurgische Industrie und betrifft insbesondere Verfahren zum Flammentorkretieren eines metallurgischen Aggregats.The present invention relates to the metallurgical industry and relates in particular to methods for flame retarding a metallurgical aggregate.

Zugrundeliegender Stand der TechnikUnderlying state of the art

Es ist ein Verfahren zum Torkretieren der feuerfesten Auskleidung eines metallurgischen Aggregats bekannt bei dem eine Torkretmasse in einem Flammenstrahl über eine Düse auf die feuerfeste Auskleidung gerichtet und zwischen der Düse und der feuerfesten Auskleidung ein elektrisches Gleichfeld erzeugt wird (Urhebverscheinschrift Nr. 334464, erteilt in der UdSSR und veröffentlicht am 30.03.82 im Bulletin "Entdeckungen, Erfindungen, Gebrauchsmuster und warenzeichen", Nr. 12).A method for goal-locking the refractory lining of a metallurgical unit is known, in which a goal-residue mass is directed in a flame jet over a nozzle onto the refractory lining and an electric constant field is generated between the nozzle and the refractory lining (certificate of origin No. 334464, issued in US Pat USSR and published on 30.03.82 in the bulletin "Discoveries, inventions, utility models and trademarks", No. 12).

Bei der Ausführung der Reparaturarbeiten nach diesem Verfahren werden die Teilchen in der Torkretflamme mit gleicharäger Ladungen geladen und bei der Herstellung des Überzugs treten die Abstoßungskräfte der gleichnamigen Ladungen teilweise in Wirkung, was zu einer geringeren Dichte des Torkretüberzugs im Vergleich zur feuerfesten Grundauskleidung und folglich zu einer geringeren Haltbarkeit des Torkretüberzugs führt.When carrying out the repair work according to this method, the particles in the gate flame are charged with the same charge and during the production of the coating, the repulsive forces of the charge of the same name partially take effect, which leads to a lower density of the gate coating compared to the refractory basic lining and consequently to one leads to reduced durability of the door liner.

Eine Flammspritzvorrichtung mit Raketen beschleunigern ist dies EP-A-0052821 bekannt.A flame spray device with rocket accelerators is known from EP-A-0052821.

Es ist ebenfalls ein Verfahren zum Flammentorkretieren der Auskleidung eines metallurgischen Aggregats bekannt, bei dem auf due feuerfeste Auskleidung eine aus Forkretmasse, Brennstoff und Sauerstoff bestehende Torkretflamme gerichtet wird, und auf die Torkretflamme gleichzeitig mit einem energetischen Wellenfeld mit einer Schwingungsfrequenz von 1,0 bis 20 kHz eingewirkt wird.A method for flame retarding the lining of a metallurgical unit is also known, in which a flame retardant flame consisting of forcretant, fuel and oxygen is directed onto the fire-resistant lining and the flame retardant flame simultaneously with an energetic wave field with an oscillation frequency of 1.0 to 20 kHz is acted on.

Das energetische Wellenfeld pflanzt sich im gesamten Innenvolumen des Aggregats fort und wirkt auf die dort befindliche Torkretflamme ein (Urheberscheinschrift Nr. 768819, erteil in der UdSSR und veröffentlicht am 07.10.80 im Bulletin "Entdeckungen, Erfindungen, Gebrauchsmuster und Warenzeichnen", Nr. 37).The energetic wave field propagates throughout the entire internal volume of the unit and acts on the door's torch flame (copyright notice No. 768819, issued in the USSR and published on October 7, 1980 in the bulletin "Discoveries, Inventions, Utility Models and Trademarks", No. 37 ).

Bei diesem Torkretierverfahren verteilt sich die Wellenenergie des Feldes auf das gesamte Innenvolumen des Aggregats und auf die Torkretflamme wirkt eine verhältsnismäßig kleiner Teil derselben ein. Infolge einer niedrigen Feldintensität in der Torkretflamme verlaufen die Verbrennungs- und Wärmeaustauschprozesse in dieser nicht intensiv genug wodurch die Brennstoffteilchen während der Flugzeit nicht vollständig verbrennen, in den aufzutragenden Überzug eindringen und auf seiner Overfläche bzw. in diesem nachbrennen, was seinerseits zu einer erhöhten Porigkeit des Torkretüberzugs und also Folge zu seiner geringeren Haltbarkeit führt. Eine Vergrößerung der Leistung der Quelle des energeritschen Feldes auf einen Wert, bei dem die Intensivierung ausreichend hoch ist, ist infolge einer schädlichen Feldeinwirkung auf das Aggregat und das Bedienungspersonal unmöglich.With this door locking method, the wave energy of the field is distributed over the entire internal volume of the unit and a relatively small part of it acts on the door locking flame. As a result of a low field intensity in the gate flame, the combustion and heat exchange processes in it are not intense enough, as a result of which the fuel particles do not burn completely during the flight time, penetrate into the coating to be applied and burn on its over surface or in it, which in turn leads to an increased porosity of the Goal liner cover and thus result in its lower durability. An increase in the power of the source of the energy field to a value at which the intensification is sufficiently high is impossible due to a harmful field effect on the unit and the operating personnel.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zugrunde ein solchen Verfahren zum Flammentorkretieren eines metallurgischen Aggregats zu schaffen, bei dem die Welleneinwirkung auf die Torkretflamme derart ist, daß eine vollständige Verbrennung der Brennstoffteilchen während ihrer Flugzeit in der Torkretflamme gewährleistet und folglich die Haltbarkeit des Torkretüberzugs erhöht wird.The invention has for its object to provide such a method for flame retarding a metallurgical unit, in which the wave action on the goal retardant flame is such that a complete combustion of the fuel particles during their flight time in the goal retarding flame ensures and consequently the durability of the goal retardant coating is increased.

Diese Aufgabe wird dadurch gelöst, daß in einem Verfahren zum Flammentorkretieren eines metallurgischen Aggregats, bei dem auf die feuerfeste Auskleidung des Aggregates eine aus Torkretmasse, Brennstoff und Sauerstoff bestehende Torkretflamme gerichtet und auf diese mit einem energetischen Wellenfeld eingewirkt wird, erfindungsgemäß das energetische Wellenfeld durch akustische Schwingungen erzeugt wird, wobei sie in der Torkretflamme maximal konzentriert werden und die akustischen Schwingungen mit einem Sauerstoffstrahl erzeugt werden, der entlang der geometrischen Achse der Torkretflamme gerichtet ist und durch eine Ultraschallpfeife durchgelassen wird.This object is achieved in that according to the invention the energetic wave field by acoustic in a method for flame retarding a metallurgical unit, in which a door torch flame consisting of gate residue mass, fuel and oxygen is directed onto the refractory lining of the unit and acted on it with an energetic wave field Vibrations are generated, where they are maximally concentrated in the gate flame and the acoustic vibrations are generated with an oxygen jet which is directed along the geometric axis of the gate flame and is passed through an ultrasonic whistle.

Eine derartige Erzeugung der akustischen Schwingungen stellt die einfachste technische Lösung zur Durchführung des erfindungsgemäßen Verfahrens mit einem minimale Aufwand dar.Such a generation of the acoustic vibrations represents the simplest technical solution for carrying out the method according to the invention with minimal effort.

Es ist ebenfalls zweckmäßig, daß die akustischen Schwindigugen mit zwei Sauerstoffstrahlen erzeugt werden, die auf den genüberliegenden Seiten der geometrischen Achse der Torkretflamme liegen, wobei jeder von ihnen unter einem winkel von max. 50° zu dieser Achse gerichtet ist und durch Ultraschallpfeigen durchgelassen wird.It is also expedient that the acoustic shrinkage is generated with two oxygen jets which lie on the opposite sides of the geometric axis of the gate flame, each of them at an angle of max. Is directed 50 ° to this axis and is let through by ultrasonic peening.

Bei einer solchen Richtung der akustischen Schwingungen wird die Torkretflamme in besonders vollem Maße von diesen erfaßt.With such a direction of the acoustic vibrations, the gate flame is particularly fully captured by them.

Es ist besonders vorteilhaft, daß die akustischen Schwingungen mit einer Feldintensität nicht weniger als 100 dB zugeführt werden.It is particularly advantageous that the acoustic vibrations are applied with a field intensity of not less than 100 dB.

Bei einer solchen Intensitäßt verbrennen die Brennstoffteilchen am volständigsten.At such an intensity, the fuel particles burn most completely.

Das erfindungsgemäße Verfahren zum Flammentorkretieren eines metallurgischen Aggregats gestattet es die Haltbarkeit des Torkretüberzugs mit billigeren und einfachsten Mitteln stark zu erhohen.The method according to the invention for flame retarding a metallurgical aggregate makes it possible to greatly increase the durability of the door retort coating with cheaper and simplest means.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Nachstehend wird die vorliegende Erfindung an Hand eines konkreten Durchführungsbeispiels unter Bezugnahme auf die beiliegenden Zeichnungen erläutert, in denen es zeigt:

  • Fig. 1 - eine Blasform und die feuerfeste Auskleidung eines metallurgischen Aggregats, mit zwei Anordnungsvarianten der Ultraschallpfeifen;
  • Fig. 2 - eine Baugruppe A in Fig. 1, vergrößert.
The present invention is explained below on the basis of a concrete exemplary embodiment with reference to the accompanying drawings, in which it shows:
  • Fig. 1 - a blow mold and the refractory lining of a metallurgical unit, with two arrangement variants of the ultrasonic pipes;
  • Fig. 2 - an assembly A in Fig. 1, enlarged.

Die bevorzugte Durchführungsvariante der ErfindungThe preferred embodiment of the invention

Das Verfahren zum Flammentorkretieren eines metallurgischen Aggregats besteht darin, daß auf die feuerfeste Auskleidung 1 (Fig. 1) eines metallurgischen Aggregats (nicht gezeigt) aus einer Blasform 2 eine Torkretflamme 3 gerichtet und gleichzeigit auf diese Torkretflamme 3 mit einem energetischen Feld eingewirkt wird, das durch akutische Schwingungen "a" erzeugt wird, wobei diese Schwingungen auf der Torkretflamme maximal konzentriert werden. Die Blasform 2 enthält eine Rohrleitung 4 für die Zufuhr einer Torkretmasse mit einem Brennstoff, eine Rohrleitung 5 für die Sauerstoffzufuhr und eine Rohrleitung 6 für eine Kühlmittel, die koaxial angeordnet sind. Die Rohrleitung 4 ist mit einer Düse 7 für die Zuführung der Torkretmasse mit Brennstoff und die Rohrleitung 5 mit einer Düse 8 für die Sauerstoffzuführung versehen. In der ersten Variante besteht die Düse 8 aus einer Ultraschallpfeife 9 (Fig. 2) und einem Schalltrichter 10. In dieser Variante werden die akustischen Schwingungen durch einen Sauerstoffstrahl erzeugt, der entlang der geometrischen Achse "b" (Fig. 1) der Torkretflamme über die Ultraschallpfeife 9 (Fig. 2) ausströmt.The method for flame retarding a metallurgical aggregate consists in that a flame retardant flame 3 is directed onto the refractory lining 1 (FIG. 1) of a metallurgical aggregate (not shown) from a blow mold 2 and, at the same time, an energetic field is exerted on this retort flame 3 is generated by acute vibrations "a", these vibrations being maximally concentrated on the gate flame. The blow mold 2 contains a pipeline 4 for the supply of a gate residue with a fuel, a pipeline 5 for the oxygen supply and a pipeline 6 for a coolant, which are arranged coaxially. The pipeline 4 is provided with a nozzle 7 for supplying the gate residue with fuel and the pipeline 5 with a nozzle 8 for supplying oxygen. In the first variant, the nozzle 8 consists of an ultrasound whistle 9 (FIG. 2) and a sound funnel 10. In this variant, the acoustic vibrations are generated by an oxygen jet which passes along the geometric axis "b" (FIG. 1) of the gate flame the ultrasonic whistle 9 (FIG. 2) flows out.

In einer anderen Ausführungsvariante werden die akustischen Schwingungen durch zwei Sauerstoffstrahlen erzeugt, die durch Ultraschallpfeifen 11 (Fig. 1) durchgelassen werden, welche auf den gegenüberfliegenden Seiten der geometrischen Achse "b" der Torkretflamme 3 unter einem winkel "a' von max. 50° zu dieser angeordnet sind. Die Ultraschallpfeife 11 ist im wesentlichen ähnlich wie die Pfeife 9, jedoch mit einem ungeteilten Mittelteil ausgeführt weil die Torkretmasse under der Brennstoff durch die Düse 7 und die Hauptmenge des Sauerstoffs durch die Düse 12 strömen. Das erfindungsemäße Verfahren zum Flammentorkretieren wurde an Konvertern in einem Hüttenwerk geprüft. Zum Torkretieren wurde eine normale Zweikomponenten-Torkretmasse verwendet, die eine Feuerfest- und eine Brennstoffkomponente enthalten hat. Das Torkretieren wurde in senkrechter Stellung des Konverters durchgeführt. Nach dem Abfluß von Stahl und Schlacke wurde die Blasform 2 in den Konverter eingeführt und die Zuführung der Torkretmasse über die Düse 7 und des Sauerstoffs über die Düse 12 eingeschaltet. Die zusätzlichen Sauerstoffstrahlen wurden über die auf den beiden Seiten der Düsen 7 und 12 angeordneten Ultraschallpfeifen 11 zugeführt.In another embodiment variant, the acoustic vibrations are generated by two oxygen jets which are passed through ultrasonic whistles 11 (FIG. 1), which on the opposite sides of the geometric axis "b" of the gate flame 3 at an angle "a 'of max. 50 ° The ultrasonic whistle 11 is essentially similar to the whistle 9, but with an undivided middle part, because the garbage mass flows under the fuel through the nozzle 7 and the main amount of oxygen through the nozzle 12. The method according to the invention for flame retardation was tested on converters in a metallurgical plant. A normal two-component gate secret compound, which contained a refractory and a fuel component, was used for the gate locking. The gate locking was carried out in the vertical position of the converter. After the steel and slag had run off, the blow mold 2 was placed in the Converter introduced and d The supply of the garbage paste via the nozzle 7 and the oxygen via the nozzle 12 is switched on. The additional oxygen jets were supplied via the ultrasonic pipes 11 arranged on the two sides of the nozzles 7 and 12.

Die Sauerstoffstrahlen bringen beim Durchströmen durch die Pfeife 11 die akustischen Schwingungen zur Oszillation, die unter einem Winkel von 30° zur Achse "b" der Torkretflamme 3 gerichtet sind.When flowing through the whistle 11, the oxygen jets cause the acoustic oscillations to oscillate, which are directed at an angle of 30 ° to the axis "b" of the gate flame 3.

Beim Brennen des Brennstoffs werden flüchtige Stoffe ausgeschieden, die beim Verbrennen die Brennstoffteilchen umhüllen und den Sauerstoffzutritt zu innen erschweren. Ein intensives Brennen des Brennstoffteilchens beginnt nach dem Verbrennen der flüchtigen Stoffe. Bei der Einwirkung mit den konzentrierten akutischen Schwingungen auf die Forkretflamme reicht die Energie des entstehenden akustischen Feldes aus, um die flüchtigen Stoffe des Gasmediums und die Festteilchen im Schwingungen zu setzen, wodurch der Sauerstoffzutritt zu die Brennstoffteilchen erleichtert und die Verbrennungsprozesse in der Torkretflamme intensiviert werden. Die Brennstoffteilchen verbrennen während der Flugzeit, wodurch die Porigkeit des Überzugs stark verringert wird. Andererseits werden die Feuerfestteilchen von den flüchtigen Stoffen umspült, wodurch der Wärmeaustausch in der Torkretflamme verbessert und zusammen mit der Verringerung der Porigkeit die Qualität des Torkretüberzugs verbessert wird. Durch den Einsatz der zusätzlichen Sauerstoffstrahlen zur Erzeugung der akustischen Schwingungen wird eine ausreichende Schwingungsleistung ohne zusätzliche Energiequellen und ohne Sauerstoffverluste erzielt, weil der durch die zusätzlichen Strahlen zugeführte Sauerstoff ebenfalls am Prozeß der Brennstoffverbrennung beteiligt ist.When the fuel is burned, volatile substances are excreted, which, when burned, envelop the fuel particles and make it difficult for oxygen to reach the inside. An intense burning of the fuel particle begins after burning the volatile substances. When the concentrated acoustic vibrations act on the flame, the energy of the acoustic field is sufficient to set the volatile substances in the gas medium and the solid particles in vibration, which facilitates the access of oxygen to the fuel particles and intensifies the combustion processes in the gate flame. The fuel particles burn during flight time, which greatly reduces the porosity of the coating. On the other hand, the volatile substances wash around the refractory particles, which improves the heat exchange in the doorway flame and, together with the reduction in porosity, improves the quality of the doorway cover. By using the additional oxygen jets to generate the acoustic vibrations, a sufficient vibration performance is achieved without additional energy sources and without oxygen losses, because the oxygen supplied by the additional jets is also involved in the fuel combustion process.

Es wurden Vergleichsprüfungen der bekannten Verfahren und des erfindungsgemäßen Verfahrens zum Flammentorkretieren eines metallurgischen Aggregats durchgeführt, deren Ergebnisse in der Tabelle zusammengefaßt sind.

Figure imgb0001
Comparative tests of the known methods and the method according to the invention for flame retarding a metallurgical aggregate were carried out, the results of which are summarized in the table.
Figure imgb0001

Wie aus der Tabelle ersichtlich ist, wird bei der Einwirkung auf de Torkretflamme mit den konzentrierten akustischen Schwingungen mit einer Feldintensität von nicht weniger als 100 dB ein hochqualitativer Torkretüberzug aufgetragen; die Verschleißgeschwindigkeit das nach dem erfindungsgemäßen Verfahren aufgetragenen Überzugs ist um zweimal kleiner als die Verschleißgeschwindigkeit der nach den bekannten Verfahren aufgetragenen Überzuge. Aus der Tabelle ist ersichtlich, daß der Überzug unter der Einwirkung der akustischen Schwingungen mit einer Intensität von 140 bis 165 dB besonders wirksam aufgetragen wird.As can be seen from the table, a high-quality door chalk coating is applied to the door chimney flame with the concentrated acoustic vibrations with a field intensity of not less than 100 dB; the wear rate of the coating applied by the process according to the invention is twice as low as the wear rate of the coatings applied by the known processes. From the table it can be seen that the coating is applied particularly effectively under the influence of the acoustic vibrations with an intensity of 140 to 165 dB.

Industrielle AnwendbarkeitIndustrial applicability

Besonders wirksam kann die vorliegende Erfindung bei der Reparatur der Auskleidung von Konvertern, Lichtbogen-Strahlschmelzöfen, Siemens-Martin-Öfen, Pfannen und anderen Stahlschmelzaggregaten im Warmzustand eingesetzt werden.The present invention can be used particularly effectively in the repair of the lining of converters, arc beam melting furnaces, Siemens Martin furnaces, pans and other steel melting units in the hot state.

Claims (4)

1. A process for flame guniting a metallurgical unit in which agunite flame (3) comprising a gunite composition, fuel and oxygen is directed towards the refractory lining (1) of the unit with simultaneous action by an oscillating energy on the gunite flame (3), characterised in that the oscillating field is produced by acoustic vibrations or oscillations, the same being concentrated mainly in the gunite flame, and the acoustic vibrations are produced by an oxygen stream which is directed along the geometric axis (b) of the gunite flame (3) and passes through an ultrasonic whistle (9).
2. A process according to claim 1, characterised in that, the acoustic vibrations are produced by two oxygen streams disposed on opposite sides of the geometric axis (b) of the gunite flame (3), each of them extending to an angle of at most 50° to the latter axis and passing through ultrasonic whistles (11).
3. A process according to claim 1 or 2, characterised in that the acoustic vibrations are supplied at a field intensity of at least 100 dB.
EP86906033A 1986-06-20 1986-06-20 Method of torch guniting of metallurgical plant Expired - Lifetime EP0271580B1 (en)

Applications Claiming Priority (1)

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PCT/SU1986/000062 WO1987007914A1 (en) 1986-06-20 1986-06-20 Method of torch guniting of metallurgical plant

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EP0271580A1 EP0271580A1 (en) 1988-06-22
EP0271580A4 EP0271580A4 (en) 1988-10-06
EP0271580B1 true EP0271580B1 (en) 1991-01-23

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US (1) US4759531A (en)
EP (1) EP0271580B1 (en)
JP (1) JPH01500534A (en)
AT (1) ATE60365T1 (en)
AU (1) AU590635B2 (en)
BR (1) BR8607174A (en)
DE (1) DE3677230D1 (en)
HU (1) HU199566B (en)
WO (1) WO1987007914A1 (en)

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SU381687A1 (en) * 1968-03-22 1973-05-22 METHOD OF HOT REPAIR OF METALLURGICAL UNITS OF CYLINDRICAL FORM
SU768819A1 (en) * 1978-02-21 1980-10-07 Предприятие П/Я А-3244 Method of torch guniting of metallurgical set lining
US4358053A (en) * 1980-11-26 1982-11-09 Metco, Inc. Flame spraying device with rocket acceleration

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HUT46372A (en) 1988-10-28
EP0271580A4 (en) 1988-10-06
DE3677230D1 (en) 1991-02-28
EP0271580A1 (en) 1988-06-22
JPH01500534A (en) 1989-02-23
AU590635B2 (en) 1989-11-09
AU6475486A (en) 1988-01-12
US4759531A (en) 1988-07-26
HU199566B (en) 1990-02-28
BR8607174A (en) 1988-09-13
WO1987007914A1 (en) 1987-12-30
ATE60365T1 (en) 1991-02-15

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