EP0091422A2 - Shaft furnace tuyere connection - Google Patents

Shaft furnace tuyere connection Download PDF

Info

Publication number
EP0091422A2
EP0091422A2 EP83890038A EP83890038A EP0091422A2 EP 0091422 A2 EP0091422 A2 EP 0091422A2 EP 83890038 A EP83890038 A EP 83890038A EP 83890038 A EP83890038 A EP 83890038A EP 0091422 A2 EP0091422 A2 EP 0091422A2
Authority
EP
European Patent Office
Prior art keywords
wind
shaft furnace
nozzle tip
box
mold
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
EP83890038A
Other languages
German (de)
French (fr)
Other versions
EP0091422B1 (en
EP0091422A3 (en
Inventor
Paul Müllner
Max Vorderwinkler
Wilhelm Stastny
Gerhard Dr. Lazar
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.)
Voestalpine AG
Original Assignee
Voestalpine AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0091422A2 publication Critical patent/EP0091422A2/en
Publication of EP0091422A3 publication Critical patent/EP0091422A3/en
Application granted granted Critical
Publication of EP0091422B1 publication Critical patent/EP0091422B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/163—Blowpipe assembly

Definitions

  • the invention relates to a nozzle assembly for a shaft furnace, in particular a blast furnace, with a nozzle tip connected to a hot-wind ring line, which leads line-wise into a windform formed from full-walled, uncooled, high-temperature-resistant material, with a cavity in the for direct support of the wind form and thus the nozzle tip
  • the windform box limiting the lining of the shaft furnace is inserted into the shaft furnace.
  • Nozzle sticks of a more recent design for a blast furnace are known, for example, from Lueger, Lexikon dertechnik, Volume 5, 1963, page 147.
  • the hot wind is conducted from a ring line around the blast furnace through the nozzle blocks into the furnace.
  • Each nozzle assembly has an uncooled nozzle tip that protrudes into the cavity that is delimited by the water-cooled windshield box (also called the windshield shape).
  • the likewise water-cooled wind form is attached to the nozzle tip and protrudes through the front opening of the wind form box into the interior, the reaction zone, of the blast furnace.
  • the wind form is tightly inserted with an outer cone in an inner cone of the wind form box, and the nozzle tip is pressed against the wind form by means of clamping screws.
  • the nozzle tip For hot wind temperatures up to around 800 ° C, the nozzle tip is made of cast hematite. Its tip is also cooled by the water-cooled wind form. For higher hot wind temperatures up to about 1400 ° C, as they occur in modern large-scale blast furnaces, the nozzle tip is provided with a refractory lining.
  • the water-cooled wind forms are the most heavily loaded fittings in the blast furnace, they are exposed to strong thermal, chemical and mechanical loads and are therefore subject to heavy wear. As a result of these loads, the cooling water circuit breaks again and again, after which it must be switched off. The wind form must then be exchanged, which means an unscheduled shutdown of the furnace.
  • D ouble chamber wind forms are used, as they are known, for example, from DE-OS 26 08 365th These have two separate cooling circuits, e.g. one in a prechamber and one in a main chamber. The antechamber cools the part of the wind form exposed inside the furnace. If the pre-chamber is damaged, its cooling circuit is shunted off and the wind form can continue to be operated with the main chamber still intact until the blast furnace is scheduled to come to a standstill. However, this solution is not entirely satisfactory because of the heat removal from the hot wind. In addition, two cooling circuits per type of wind are very complex.
  • the task according to the invention is to create a nozzle block with a solid wind form for one Provide blast furnace, but no leakage problems or none at the transition to the windform box premature wear occurs, etc. both on the wind form and on the wind form box.
  • wind mold box is formed from full-walled, uncooled, high-temperature-resistant materials, in particular from ceramic sintered mass.
  • Highly melting metal oxides and / or metal compounds such as nitrides, carbides, silicides or borides, or metal-ceramic composites (cermets) are advantageous as materials for the uncooled wind mold and the uncooled wind mold box.
  • the part of the articulated connection provided on the nozzle tip is connected to a compressed air supply and discharge line.
  • FIG. 1 showing a section through an axis of a nozzle assembly which is used in a blast furnace according to a first embodiment
  • FIG. 2 an analog representation of a second embodiment.
  • a windform ring 3 is welded into the blast furnace shell 1, which is lined on the inside with a refractory lining 2.
  • the wind mold box 6 has an inner cone 9, into which the wind mold 10 with an outer cone 11 is inserted.
  • the wind mold 10 and the wind mold box 6 are full-walled and uncooled and made from a ceramic sintered mass which is resistant to both oxidizing and reducing conditions.
  • the wind form 10 passes through the brick lining 2 and projects into the furnace interior 13 with a protrusion 12.
  • the nozzle tip 14 which is also uncooled, is provided with a refractory lining 15 and is pressed towards the center of the furnace by means of clamping screws (not shown). It rests with a front spherical surface 16, which is provided on the shell 17 of the nozzle tip 14 made of high-melting metal, against a conical surface 18 of the wind form. A ball joint is formed by this spherical surface 16 and conical surface 18, which enables the nozzle tip 14 to move with respect to the wind mold 10 and also with respect to the wind mold box 6.
  • the front end portion is provided 19 of the nozzle tip 14 with a spiral-shaped cavity 20 reßluftzu- to a P and outlet is connected to 21 and 22, so that the front end portion 19 of the nozzle tip 14 before Overheating can be protected.
  • a wind mold 10 with an axis 23 inclined to the wind mold box 6 is used in order to blow the hot wind obliquely downwards into the blast furnace.
  • the axis 24 of the nozzle tip is also inclined with respect to the axis 25 of the windform box.
  • High-melting metal oxides and metal compounds such as nitrides, carbides, silicides or borides, as well as coated high-melting metals and metal-ceramic composites (cermets) are suitable as materials for the wind mold 10 and the wind mold box 6.
  • Refractory metals such as molybdenum, W ungsten, niobium, tantalum, may also be used, but they must before an oxidizing atmosphere by means of a coating such as MoSi 2 or WSi 2, and are protected from a CO / C0 2 atmosphere.
  • a coating is a very dense and firmly adhering protection.
  • the advantage of the high-melting metals lies in their great mechanical strength.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Ceramic Products (AREA)

Abstract

1. A tuyere connection for a shaft furnace, in particular for a blast furnace, comprising a tuyere tip (14) connected to a hot-air annular piping and entering into a non-cooled full-walled tuyere (10) made of a high-temperature resistant material in a conduit-like manner, a tuyere box (6) defining a cavity in the brickwork (2) of the shaft furnace being inserted in the shaft furnace for directly supporting the tuyere (10) and, thus, the tuyere tip (14), characterized in that also the tuyere box (6) is made of non-cooled full-walled high-temperature resistant materials, in particular of ceramic sinter mass.

Description

Die Erfindung betrifft einen Düsenstock für einen Schachtofen, insbesondere einen Hochofen, mit einer an eine Heißwindringleitung angeschlossenen Düsenspitze, die leitungsmäßig in eine aus vollwandigem, ungekühltem hochtemperatmfestem Werkstoff gebildete Windform mündet, wobei zur unmittelbaren Abstützung der Windform und damit der Düsenspitze ein eine Höhlung in der Ausmauerung des Schachtofens begrenzender Windformkasten in den Schachtofen eingesetzt ist.The invention relates to a nozzle assembly for a shaft furnace, in particular a blast furnace, with a nozzle tip connected to a hot-wind ring line, which leads line-wise into a windform formed from full-walled, uncooled, high-temperature-resistant material, with a cavity in the for direct support of the wind form and thus the nozzle tip The windform box limiting the lining of the shaft furnace is inserted into the shaft furnace.

Düsenstöcke neuerer Bauart für einen Hochofen sind beispielsweise aus Lueger, Lexikon der Technik, Band 5, 1963, Seite 147, bekannt. Der Heißwind wird von einer rund um den Hochofen geführten Ringleitung über die Düsenstöcke in den Ofen geleitet. Jeder Düsenstock weist eine ungekühlte Düsenspitze auf, die in die Höhlung, die von dem wassergekühlten Windformkasten (auch Windschutzform genannt) begrenzt wird, ragt. An die Düsenspitze angesetzt ist die ebenfalls wassergekühlte Windform, die durch die stirnseitige öffnung des Windformkastens bis in das Innere, die Reaktionszone, des Hochofens ragt. Die Windform ist mit einem Außenkonus in einem Innenkonus des Windformkastens dicht eingesetzt, und die Düsenspitze wird mittels Spannschrauben gegen die Windform gepreßt.Nozzle sticks of a more recent design for a blast furnace are known, for example, from Lueger, Lexikon der Technik, Volume 5, 1963, page 147. The hot wind is conducted from a ring line around the blast furnace through the nozzle blocks into the furnace. Each nozzle assembly has an uncooled nozzle tip that protrudes into the cavity that is delimited by the water-cooled windshield box (also called the windshield shape). The likewise water-cooled wind form is attached to the nozzle tip and protrudes through the front opening of the wind form box into the interior, the reaction zone, of the blast furnace. The wind form is tightly inserted with an outer cone in an inner cone of the wind form box, and the nozzle tip is pressed against the wind form by means of clamping screws.

Für Heißwindtemperaturen bis etwa 800°C ist die Düsenspitze aus Hämatitguß gefertigt. Ihre Spitze ist durch Anliegen an der wassergekühlten Windform mitgekühlt. Für höhere Heißwindtemperaturen bis zu etwa 1400°C, wie sie bei modernen Großraumhochöfen auftreten, ist die Düsenspitze mit einer feuerfesten Zustellung versehen.For hot wind temperatures up to around 800 ° C, the nozzle tip is made of cast hematite. Its tip is also cooled by the water-cooled wind form. For higher hot wind temperatures up to about 1400 ° C, as they occur in modern large-scale blast furnaces, the nozzle tip is provided with a refractory lining.

Die wassergekühlten Windformen stellen die am stärksten belasteten Armaturen des Hochofens dar, sie sind starken thermischen, chemischen und mechanischen Belastungen und daher starkem Verschleiß ausgesetzt. Als Folge dieser Belastungen kommt es immer wieder zu einem Durchbruch des Kühlwasserkreislaufes, worauf dieser ausgeschaltet werden muß. Es muß dann die Windform ausgetauscht werden, was einen nicht eingeplanten Ofenstillstand bedeutet.The water-cooled wind forms are the most heavily loaded fittings in the blast furnace, they are exposed to strong thermal, chemical and mechanical loads and are therefore subject to heavy wear. As a result of these loads, the cooling water circuit breaks again and again, after which it must be switched off. The wind form must then be exchanged, which means an unscheduled shutdown of the furnace.

Ein weiterer Nachteil der wassergekühlten Windformen ist darin zu sehen, daß dem Heißwind die vorher mit erheblichem Energieaufwand zugeführte Wärme zum Teil wieder entzogen wird.Another disadvantage of the water-cooled wind forms is that the heat that was previously supplied with considerable energy expenditure is partially removed from the hot wind.

Um Hochofenstillstände zu vermeiden, werden sogenannte "Doppelkammer-Windformen" verwendet, wie sie beispielsweise aus der DE-OS 26 08 365 bekannt sind. Diese weisen zwei getrennte Kühlkreisläufe auf, u.zw. einen in einer Vorkammer und einen in einer Hauptkammer. Die Vorkammer kühlt den ofeninnenseitig exponierten Teil der Windform. Bei Beschädigung der Vorkammer wird deren Kühlkreislauf abgeschiebert und die Windform kann mit der noch intakten Hauptkammer bis zu einem geplanten Stillstand des Hochofens weiterbetrieben werden. Diese Lösung ist jedoch wegen des Wärmeentzuges des Heißwindes nicht restlos befriedigend. Außerdem sind zwei Kühlkreisläufe je Windform sehr aufwendig.To avoid blast furnace shutdowns, called "D ouble chamber wind forms" are used, as they are known, for example, from DE-OS 26 08 365th These have two separate cooling circuits, e.g. one in a prechamber and one in a main chamber. The antechamber cools the part of the wind form exposed inside the furnace. If the pre-chamber is damaged, its cooling circuit is shunted off and the wind form can continue to be operated with the main chamber still intact until the blast furnace is scheduled to come to a standstill. However, this solution is not entirely satisfactory because of the heat removal from the hot wind. In addition, two cooling circuits per type of wind are very complex.

Um den Verschleiß an Windformen und die Abkühlung des Heißwindes durch die Wasserkühlung der Windformen zu vermindern, ist es bekannt (DE-OS 27 32 566, GB-PS 1 417 375, US-PS 3 831 918), die aus Kupfer oder Kupferlegierung hergestellten Windformen an ihrer Oberfläche zu beschichten. Die Nachteile gekühlter Windformen, nämlich Wärmeverluste des Heißwindes sowie Ofenstillstände in Folge eines Undichtwerdens des Kühlmittelkreislaufes der Windform, können jedoch auch durch die Verwendung beschichteter Windformen nicht gänzlich vermieden werden.In order to reduce the wear on wind forms and the cooling of the hot wind by water cooling the wind forms, it is known (DE-OS 27 32 566, GB-PS 1 417 375, US-PS 3 831 918), which are made of copper or copper alloy Coating wind forms on their surface. The disadvantages of cooled wind forms, namely heat losses from the hot wind and furnace shutdowns as a result of the coolant leaking cycle of the wind form, but cannot be completely avoided even by using coated wind forms.

Um einen Durchbruch des Kühlwasserkreislaufes an der Windform sowie eine Abkühlung des Heißwindes in der Windform zu vermeiden, ist es aus der AT-PS 7050 sowie aus der DE-PS 650 859 bekannt, massive Hochofenformen aus Sintermagnesit oder Hartmetall zum Einleiten des Windes vorzusehen. Diese aus der Beginnzeit der modernen Hochofentechnik stammenden Vorschläge haben sich jedoch nicht durchgesetzt, da einerseits (AT-PS 7050) ein Windformkasten überhaupt unberücksichtigt ist und andererseits (DE-PS 650 859) die massive Windform an den gekühlten, aus Gußeisen bestehenden Windformkasten direkt angeschlossen ist. Bei Kontakt einer massiven, auf höchste Temperaturen aufgeheizten Windform mit einem gekühlten gußeisernen Windformkasten kommt es an der Übergangsstelle zu hohen Temperaturdifferenzen und dadurch verursachten Spannungen. Diese bewirken eine vorzeitige Zerstörung der Berührungsfläche zwischen Windform und Windformkasten, so daß die Dichtheit zwischen diesen beiden Teilen schon nach kurzer Betriebszeit nicht mehr gegeben ist.In order to avoid a breakthrough of the cooling water circuit on the wind form and a cooling of the hot wind in the wind form, it is known from AT-PS 7050 and from DE-PS 650 859 to provide massive blast furnace forms made of sintered magnesite or hard metal for introducing the wind. However, these suggestions from the early days of modern blast furnace technology have not prevailed, because on the one hand (AT-PS 7050) a wind mold box is not considered at all and on the other hand (DE-PS 650 859) the massive wind mold is directly connected to the cooled wind mold box made of cast iron is. When a massive wind mold heated to the highest temperatures comes into contact with a cooled cast iron wind mold box, there are high temperature differences at the transition point and the resulting stresses. These cause premature destruction of the contact surface between the wind mold and the wind mold box, so that the tightness between these two parts is no longer present after a short operating time.

Da heute (vgl. Lueger, Band 5, 1963, Seite 147) ein Windformkasten unerläßlich ist - u.zw. einerseits wegen des hohen Gewichts des aus Windform und Windformkasten bestehenden Hochofeneinsatzes und andererseits wegen des einfachen Ersatzes der mehr oder weniger verschleißenden Windform unter Einsparung eines Austausches des demgegenüber wesentlich weniger verschleißenden Windformkastens -, ist erfindungsgemäß die Aufgabe gestellt, einen Düsenstock mit einer massiven Windform für einen Hochofen vorzusehen, wobei jedoch am Übergang zum Windformkasten keine Dichtigkeitsprobleme bzw. kein vorzeitiger Verschleiß auftritt, u.zw. sowohl an der Windform als auch am Windformkasten.Because today (see Lueger, Volume 5, 1963, page 147) a wind form box is indispensable - and so on. On the one hand because of the high weight of the blast furnace insert consisting of the wind form and the wind form box, and on the other hand because of the simple replacement of the more or less wearing wind form while saving an exchange of the wind form case, which is much less wear-resistant, the task according to the invention is to create a nozzle block with a solid wind form for one Provide blast furnace, but no leakage problems or none at the transition to the windform box premature wear occurs, etc. both on the wind form and on the wind form box.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß auch der Windformkasten aus vollwandigen ungekühlten hochtemperaturfesten Werkstoffen, insbesondere aus keramischer Sintermasse, gebildet ist.This object is achieved in that the wind mold box is formed from full-walled, uncooled, high-temperature-resistant materials, in particular from ceramic sintered mass.

Durch Verwendung einer ungekühlten Windform und eines ungekühlten Windformkastens läßt sich eine dichte Verbindung zwischen Windform und Windformkasten besonders einfach gestalten, u.zw. durch eine Kegelsitzverbindung. An der Berührungsstelle der Windform mit dem Windformkasten werden durch hohe Temperaturdifferenzen entstehende Spannungen vermieden, so daß eine beständige dichte Verbindung zwischen Windform und Windformkasten auch bei schlechter Wärmeleitfähigkeit von hochtemperaturfesten Werkstoffen sichergestellt ist.By using an uncooled wind mold and an uncooled wind mold box, a tight connection between the wind mold and the wind mold box can be made particularly simple, etc. through a cone seat connection. At the point of contact of the windform with the windform box, stresses arising from high temperature differences are avoided, so that a permanent, tight connection between the windform and windform box is ensured even with poor thermal conductivity of high-temperature resistant materials.

Um eine lange Standzeit für die Windform zu erzielen, ist diese zweckmäßig aus einem sowohl bei oxidierenden als auch bei reduzierenden Bedingungen beständigen Werkstoff gebildet.In order to achieve a long service life for the wind form, it is expediently formed from a material that is resistant to both oxidizing and reducing conditions.

Als Werkstoff für die ungekühlte Windform und den ungekühlten Windformkasten kommen vorteilhaft höchstschmelzende Metalloxide und/oder Metallverbindungen (Hartstoffe), wie Nitride, Carbide, Silizide oder Boride, oder metallkeramische Verbundstoffe (Cermets) in Frage.Highly melting metal oxides and / or metal compounds (hard materials), such as nitrides, carbides, silicides or borides, or metal-ceramic composites (cermets) are advantageous as materials for the uncooled wind mold and the uncooled wind mold box.

Gemäß einer bevorzugten Ausführungsform mit einer an einer Düsenspitze mittels einer Gelenkverbindung anliegenden Windform ist der an der Düsenspitze vorgesehene Teil der Gelenkverbindung an eine Preßluftzu-und -ableitung angeschlossen.According to a preferred embodiment with a wind form resting on a nozzle tip by means of an articulated connection, the part of the articulated connection provided on the nozzle tip is connected to a compressed air supply and discharge line.

Die Erfindung ist anhand zweier in der Zeichnung dargestellter Ausführungsformen näher erläutert, wobei Fig. 1 einen Schnitt durch eine Achse eines Düsenstocks, der in einem Hochofen eingesetzt ist, gemäß einer ersten Ausführungsform und Fig. 2 eine analoge Darstellung einer zweiten Ausführungsform zeigen.The invention is explained in more detail with reference to two embodiments shown in the drawing, FIG. 1 showing a section through an axis of a nozzle assembly which is used in a blast furnace according to a first embodiment and FIG. 2 an analog representation of a second embodiment.

In den Hochofenpanzer 1, der mit einer feuerfesten Ausmauerung 2 innenseitig ausgekleidet ist, ist ein Windformring 3 eingeschweißt. An diesem Windformring 3 ist ein Windformkastenrahmen 4 angeschraubt, der einen Innenkonus 5 aufweist, in den ein Windformkasten 6 mit einem Außenkonus 7 dicht eingesetzt ist. Am ofeninnenseitigen Ende 8 weist der Windformkasten 6 einen Innenkonus 9 auf, in den die Windform 10 mit einem Außenkonus 11 eingesetzt ist. Die Windform 10 und der Windformkasten 6 sind vollwandig und ungekühlt und aus einer keramischen Sintermasse, die sowohl bei oxidierenden als auch bei reduzierenden Bedingungen beständig ist, hergestellt. Die Windform 10 durchsetzt die Ausmauerung 2 und ragt mit einem Überstand 12 in den Ofeninnenraum 13.A windform ring 3 is welded into the blast furnace shell 1, which is lined on the inside with a refractory lining 2. A wind mold box frame 4, which has an inner cone 5, into which a wind mold box 6 with an outer cone 7 is sealed, is screwed onto this windform ring 3. At the inside 8 of the furnace, the wind mold box 6 has an inner cone 9, into which the wind mold 10 with an outer cone 11 is inserted. The wind mold 10 and the wind mold box 6 are full-walled and uncooled and made from a ceramic sintered mass which is resistant to both oxidizing and reducing conditions. The wind form 10 passes through the brick lining 2 and projects into the furnace interior 13 with a protrusion 12.

Die Düsenspitze 14, die ebenfalls ungekühlt ist, ist mit einer feuerfesten Ausmauerung 15 versehen und wird mittels nicht dargestellter Spannschrauben zur Ofenmitte hin gepreßt. Sie liegt mit einer stirnseitigen Kugelfläche 16, die am aus hochschmelzendem Metall hergestellten Panzer 17 der Düsenspitze 14 vorgesehen ist, an einer Kegelfläche 18 der Windform an. Durch diese Kugel- 16 und Kegelfläche 18 wird ein Kugelgelenk gebildet, welches eine Beweglichkeit der Düsenspitze 14 gegenüber der Windform 10 bzw. auch gegenüber dem Windformkasten-6 ermöglicht.The nozzle tip 14, which is also uncooled, is provided with a refractory lining 15 and is pressed towards the center of the furnace by means of clamping screws (not shown). It rests with a front spherical surface 16, which is provided on the shell 17 of the nozzle tip 14 made of high-melting metal, against a conical surface 18 of the wind form. A ball joint is formed by this spherical surface 16 and conical surface 18, which enables the nozzle tip 14 to move with respect to the wind mold 10 and also with respect to the wind mold box 6.

Gemäß der in Fig. 2 dargestellten Ausführungsform ist der vordere Endteil 19-der Düsenspitze 14 mit einem spiralförmigen Hohlraum 20 ausgestattet, der an eine Preßluftzu- und -ableitung 21 bzw. 22 angeschlossen ist, so daß der vordere Endteil 19 der Düsenspitze 14 vor Überhitzung geschützt werden kann.According to the embodiment shown in FIG. 2 embodiment, the front end portion is provided 19 of the nozzle tip 14 with a spiral-shaped cavity 20 reßluftzu- to a P and outlet is connected to 21 and 22, so that the front end portion 19 of the nozzle tip 14 before Overheating can be protected.

Wie aus Fig. 2 ersichtlich ist, ist eine Windform 10 mit zum Windformkasten 6 geneigter Achse 23 verwendet, um den Heißwind schräg nach unten in den Hochofen einzublasen. Die Achse 24 der Düsenspitze ist ebenfalls gegenüber der Achse 25 des Windformkastens geneigt.As can be seen from FIG. 2, a wind mold 10 with an axis 23 inclined to the wind mold box 6 is used in order to blow the hot wind obliquely downwards into the blast furnace. The axis 24 of the nozzle tip is also inclined with respect to the axis 25 of the windform box.

Als Werkstoffe für die Windform 10 und den Windformkasten 6 kommen höchstschmelzende Metalloxide und Metallverbindungen (Hartstoffe), wie Nitride, Carbide, Silizide oder Boride sowie beschichtete hochschmelzende Metalle und metallkeramische Verbundstoffe (Cermets) in Frage. Hochschmelzende Metalle, wie z.B. Molybdän, Wolfram, Niob, Tantal, können ebenfalls eingesetzt werden, sie müssen jedoch vor oxidierender Atmosphäre mittels eines Überzuges, wie MoSi2 oder WSi2, und vor einer CO/C02-Atmosphäre geschützt werden. Ein solcher Überzug ist ein sehr dichter und fest haftender Schutz. Der Vorteil der hochschmelzenden Metalle liegt in der großen mechanischen Beanspruchbarkeit.High-melting metal oxides and metal compounds (hard materials), such as nitrides, carbides, silicides or borides, as well as coated high-melting metals and metal-ceramic composites (cermets) are suitable as materials for the wind mold 10 and the wind mold box 6. Refractory metals, such as molybdenum, W ungsten, niobium, tantalum, may also be used, but they must before an oxidizing atmosphere by means of a coating such as MoSi 2 or WSi 2, and are protected from a CO / C0 2 atmosphere. Such a coating is a very dense and firmly adhering protection. The advantage of the high-melting metals lies in their great mechanical strength.

Claims (4)

1. Düsenstock für einen Schachtofen, insbesondere einen Hochofen, mit einer an eine Heißwindringleitung angeschlossenen Düsenspitze (14), die leitungsmäßig in eine aus vollwandigem, ungekühltem hochtemperaturfestem Werkstoff gebildete Windform (10) mündet, wobei zur unmittelbaren Abstützung der Windform (10) und damtder Düsenspitze (14) ein eine Höhlung in der Ausmauerung (2) des Schachtofens begrenzender Windformkasten (6) in den Schachtofen eingesetzt ist, dadurch gekennzeichnet, daß auch der Windformkasten (6) aus vollwandigen ungekühlten hochtemperaturfesten Werkstoffen, insbesondere aus keramischer Sintermasse, gebildet ist.1. Nozzle block for a shaft furnace, in particular a blast furnace, with a nozzle tip (14) connected to a hot wind ring line, which leads line-wise into a wind mold (10) formed from full-walled, uncooled, high-temperature-resistant material, whereby the wind mold (10) and damtder are supported directly Nozzle tip (14) is inserted into the shaft furnace, a wind mold box (6) delimiting a cavity in the brick lining (2) of the shaft furnace, characterized in that the wind mold box (6) is also formed from full-walled, uncooled, high-temperature-resistant materials, in particular from ceramic sintered mass. 2. Düsenstock nach Anspruch 1, dadurch gekennzeichnet, daß die Windform (10) aus einem sowohl bei oxidierenden als auch bei reduzierenden Bedingungen beständigen Werkstoff gebildet ist.2. Nozzle assembly according to claim 1, characterized in that the wind form (10) is formed from a material resistant to both oxidizing and reducing conditions. 3. Düsenstock nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Windform (10) und der Windformkasten (6) aus höchstschmelzenden Metalloxiden und/ oder Metallverbindungen (Hartstoffen), wie Nitriden, Carbiden, Siliziden oder Boriden, oder aus metallkeramischen Verbundstoffen (Cermets) gefertigt sind.3. Nozzle assembly according to claim 1 or 2, characterized in that the wind mold (10) and the wind mold box (6) made of high-melting metal oxides and / or metal compounds (hard materials), such as nitrides, carbides, silicides or borides, or of metal-ceramic composites (cermets ) are made. 4. Düsenstock nach einem der Ansprüche 1 bis 3, mit einer an einer Düsenspitze mittels einer Gelenkverbindung anliegenden Windform, dadurch gekennzeichnet, daß der an der Düsenspitze vorgesehene Teil der Gelenkverbindung an eine Preßluftzu- und -ableitung angeschlossen ist.4. Nozzle assembly according to one of claims 1 to 3, with a wind form abutting on a nozzle tip by means of an articulated connection, characterized in that the part of the articulated connection provided on the nozzle tip is connected to a compressed air supply and discharge line.
EP19830890038 1982-04-05 1983-03-17 Shaft furnace tuyere connection Expired EP0091422B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1344/82 1982-04-05
AT134482A AT373284B (en) 1982-04-05 1982-04-05 NOZZLE FOR A SHAFT

Publications (3)

Publication Number Publication Date
EP0091422A2 true EP0091422A2 (en) 1983-10-12
EP0091422A3 EP0091422A3 (en) 1984-07-04
EP0091422B1 EP0091422B1 (en) 1986-05-07

Family

ID=3511868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830890038 Expired EP0091422B1 (en) 1982-04-05 1983-03-17 Shaft furnace tuyere connection

Country Status (3)

Country Link
EP (1) EP0091422B1 (en)
AT (1) AT373284B (en)
DE (1) DE3363361D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742995A (en) * 1985-02-15 1988-05-10 Injectall Limited Apparatus for introducing treatment substances into liquids

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1849718A (en) * 1928-07-05 1932-03-15 Roy H Ledbetter Blast furnace tuyere
DE650859C (en) * 1934-06-02 1937-10-02 Meutsch Ausstroemduese, especially wind nozzle for shaft ovens
FR1438459A (en) * 1965-03-22 1966-05-13 Soudure Et De Rechargement Mec Improvements to nozzles and blowing accessories for blast furnaces and the like
AT332436B (en) * 1973-07-30 1976-09-27 Wurth Anciens Ets Paul DEVICE FOR INJECTION OF PRE-WARMED AIR INTO SHAFT FURNACES

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1849718A (en) * 1928-07-05 1932-03-15 Roy H Ledbetter Blast furnace tuyere
DE650859C (en) * 1934-06-02 1937-10-02 Meutsch Ausstroemduese, especially wind nozzle for shaft ovens
FR1438459A (en) * 1965-03-22 1966-05-13 Soudure Et De Rechargement Mec Improvements to nozzles and blowing accessories for blast furnaces and the like
AT332436B (en) * 1973-07-30 1976-09-27 Wurth Anciens Ets Paul DEVICE FOR INJECTION OF PRE-WARMED AIR INTO SHAFT FURNACES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742995A (en) * 1985-02-15 1988-05-10 Injectall Limited Apparatus for introducing treatment substances into liquids

Also Published As

Publication number Publication date
ATA134482A (en) 1983-05-15
AT373284B (en) 1984-01-10
DE3363361D1 (en) 1986-06-12
EP0091422B1 (en) 1986-05-07
EP0091422A3 (en) 1984-07-04

Similar Documents

Publication Publication Date Title
DE2759713C2 (en) Vessel cover for a metal melting furnace, in particular an electric arc furnace
DE19503912C2 (en) Cooling plate for shaft furnaces, especially blast furnaces
DE2532619C3 (en) Furnace for melting glass and other high-melting materials
US3722821A (en) Devices for processing molten metals
EP0091422B1 (en) Shaft furnace tuyere connection
EP1913322A1 (en) Tapping channel for a metallurgical furnace
EP0091423B1 (en) Shaft furnace tuyere stock
EP0446238A1 (en) Fluid cooled plasma burner with transferred arc.
EP0133931B1 (en) Cooling arrangement of a bottom electrode of a direct current arc furnace
AT390246B (en) METHOD FOR ELECTRIC MELTING OF NON-METAL MATERIAL AND ELECTRIC MELTING FURNACE
EP0696238B1 (en) Arrangement for connecting a stopper rod for a metallurgical vessel with a lifting device, suitable stopper rod for the arrangement and process for producing the arrangement
DD201835A5 (en) ELECTRODE FOR LIGHT BOW OUTS
DE69816000T2 (en) Device for protecting the injector tip of a burner and heating system containing the same
AU1333592A (en) Apparatus for continuously preparing castable metal matrix composite material
EP0636847B1 (en) Rotary drum furnace for the heat treatment of free flowing materials
DE2830720A1 (en) Charging device and exhaust gas duct for arc melting furnace - esp. for uniform charging when mfg. ferroalloys in sealed furnace
DE3526433C1 (en) Gas-tight furnace for melting metal
DE1583317B1 (en) Flow tube for degassing molten steel
CH653201A5 (en) Hollow electrode for feeding arc furnaces
DE3609783C2 (en) Reactor ladle
DE2608365B2 (en) Water-cooled, welded double-chamber blow mold for shaft furnaces, especially blast furnaces
EP2659008A2 (en) Method for the pyrometallurigical treatment of metals, molten metals, and/or slags
DE2546275C2 (en) Metallurgical converter with a blow hole
DE2937303A1 (en) UNIT WITH BLOWING NOZZLES, CALLED LANCK HEAD FOR BLOWING GASES, ON OR IN A BATH OF MOLTEN METAL
KR200150706Y1 (en) Leakage prevention device in cart sidewall for sintering

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB IT LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): BE DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19841218

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT LU NL SE

REF Corresponds to:

Ref document number: 3363361

Country of ref document: DE

Date of ref document: 19860612

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19870331

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19870331

Year of fee payment: 5

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19880318

BERE Be: lapsed

Owner name: VOEST-ALPINE A.G.

Effective date: 19880331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19881001

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881122

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19881201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19890331

EUG Se: european patent has lapsed

Ref document number: 83890038.9

Effective date: 19881206