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EP0521371B1 - Gas flushing brick - Google Patents

Gas flushing brick Download PDF

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Publication number
EP0521371B1
EP0521371B1 EP92110551A EP92110551A EP0521371B1 EP 0521371 B1 EP0521371 B1 EP 0521371B1 EP 92110551 A EP92110551 A EP 92110551A EP 92110551 A EP92110551 A EP 92110551A EP 0521371 B1 EP0521371 B1 EP 0521371B1
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EP
European Patent Office
Prior art keywords
gas
purging plug
accordance
connection pipe
matrix material
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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EP92110551A
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German (de)
French (fr)
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EP0521371A1 (en
Inventor
Andreas Dr. Batton
Jens Decker
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Veitsch Radex GmbH and Co OG
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Veitsch Radex GmbH and Co OG
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Publication of EP0521371A1 publication Critical patent/EP0521371A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the invention relates to a gas purging plug for metallurgical vessels according to the preamble of claim 1.
  • the gas purging plugs are usually sheet-metal-coated, the bottom of the sheet metal casing running at a distance from the bottom of the ceramic part of the gas purging plug, so that a gas distribution chamber is formed, and a gas connection pipe connects to the bottom of the sheet metal casing (DE 36 23 609 C1).
  • such a gas purging plug comprises various metal parts and is therefore complex.
  • the closure part can be reused, but a large number of metal parts are still necessary.
  • the installation of a so-called breakthrough protection, as described in DE 38 30 871 C1 is only possible to a limited extent in the known gas purging plug.
  • the gas purging plug is difficult to break out after it has worn out.
  • the invention is based on the object of structurally simplifying a gas purging plug of the type mentioned at the outset and designing it in such a way that any structural units, such as a wind box or a breakthrough protection, can be easily connected and the purging plug can be easily dismantled again after it has worn out.
  • the gas connecting piece runs with an open cross section into the purging block. Below the flushing block, the gas connection piece is in a refractory lining.
  • the gas connection piece is at least partially laid in the interior of the ceramic part of the gas purging plug and fixed there. It is designed at the same time so that further components can be connected to the gas connection piece.
  • This can be a gas connection pipe, which itself is part of a breakdown protection, as described in DE 38 30 871 C1.
  • a gas distribution chamber can be formed quasi "in-situ" in that the gas connection piece protrudes downward over the bottom of the ceramic part of the gas purging plug, the gas distribution chamber being located between the free end the gas connection piece and the bottom of the ceramic part of the gas purging plug is formed.
  • the gas-permeable part (for example the gas channels) runs from the bottom of the gas purging plug to its end face.
  • a larger gas distribution chamber can also be arranged at the gas outlet end of the gas connection piece. It can either be hollow (e.g. through Burn out a corresponding filler, which filled the corresponding volume during manufacture) or be covered by a perforated lid. It is also possible to arrange a gas-permeable, preferably ceramic, refractory plug in the gas distribution chamber. This can also act as a "breakthrough protection" against possibly infiltrating molten metal by branching the molten metal stream and thus “freezing" more quickly.
  • the insert can also be used to determine the residual stone thickness if, for example, it has a different thermal conductivity than the matrix material and erosion up to this point can be recognized by different "glow color”.
  • a gas purging plug is known from EP 0 070 197 A1 (FIG. 2), in which a gas distribution chamber is formed below the ceramic body, to which a gas connection pipe connects.
  • This assembly of gas distribution chamber and gas connection pipe can be viewed as a gas connection piece, but runs below the ceramic body of the sink. It follows that there is no intimate mechanical anchoring between the gas connection piece and the ceramic body. This makes it impossible in the known embodiment to pull the sink after its wear over the gas connection piece, for example from a perforated brick.
  • a (further) detachable wind box (gas distribution chamber) can be connected to the device at the gas inlet end of the gas connector, to which in turn a gas supply line can be connected.
  • the wind box can be easily connected at the factory.
  • This wind box can be equipped, for example, with thermocouples for gas temperature measurement or with a device for gas heating. Because the gas distribution chamber is detachable in this design, it can be removed and reused before disassembling a worn sink. This is of considerable economic advantage in particular with regard to the expensive additional devices.
  • the dimensions of the wind box and the connection-side connecting elements can be determined by the user, for example the steelworks.
  • This separate unit which can be detached from the gas purging plug, can finally also be used to record a pressure gauge in order to measure the gas pressure.
  • the mechanical connection of the gas connection piece in the ceramic matrix material can be done in different ways.
  • the corresponding section of the nozzle has reinforcing elements on the outside which improve the mechanical anchoring between the nozzle and the ceramic of the sink.
  • the definition of the nozzle can be favored in that it has holes at the upper end portion, which are penetrated by the matrix material during casting.
  • annular bottom groove is preferably introduced in the finished product and the corresponding cylindrical section of the gas connection piece is later mortared into this groove. Reinforcing elements to improve the anchoring are also advantageous here.
  • one embodiment provides for the gas connecting piece to be tapered at the lower section and to provide the connecting device at the free end of this tapered section.
  • the device for gas-tight connection to the wind box (the gas distribution chamber) and / or a gas supply line can then consist, for example, of a thread or a bayonet fitting.
  • a thread or a bayonet fitting it is also possible to form the end of the gas connecting piece with a flange which, together with a flange of the adjacent component, leads to a conventional flange connection.
  • All embodiments have in common that with the help of a simple, in particular metallic gas connection piece, which is at least partially fixed in the ceramic matrix material of the sink, a universal connection possibility for gas supply lines, gas distribution chambers (with or without additional devices) and / or pull-out devices is created.
  • the gas connector is not only simple, but also easy to position. Modifications to the gas purging plug are not necessary.
  • a sheet metal jacket can be omitted.
  • the gas purging plug can be designed with directional or non-directional porosity.
  • non-directional porosity it is preferably designed in two parts, the porous section being arranged on the inside and surrounded by a dense ceramic material.
  • the ceramic body of the gas purging plug according to FIG. 1 bears the reference number 10.
  • the gas channels 12 run at a distance from one another vertically from the bottom 14 to the end face 16 of the ceramic body 10, specifically here, as shown, only approximately in the middle.
  • a cylindrical gas connector 18 extends around the gas channels 12 into the refractory ceramic Matrix material 20 of the body 10 and is cast in there.
  • the upper section 18a of the connector 18 has reinforcing anchors 22 on the outside.
  • the connector 18 protrudes a little above the base 14.
  • the protruding lower section 18b of the connector 18 is formed with an external thread 24.
  • a sheet metal casing of the ceramic body 10 to form a gas connection piece and / or a gas distribution chamber is therefore not necessary in this embodiment.
  • the space 26 within the lower section 18b of the connector 18 can be used as a gas distribution chamber, a gas supply pipe being connectable via the external thread 24.
  • the connecting piece 18 can also have a tapered connecting piece at its lower free end, as is shown in FIG. 3 and will be explained later.
  • FIG. 1 also enables the connection of an - independent - gas distribution space, optionally with further additional devices as the embodiment according to FIG. 2 shows.
  • An essentially cylindrical metallic body 28 which has an internal thread 30 at its upper end, is connected in a gas-tight manner to the external thread 24 of the connector 18.
  • the body 28 Starting from the internal thread 30, the body 28 initially runs in a cylindrical shape and then widens - in trapezoidal cross section (part 28a) - before another, tapered cylindrical section 28b follows, which has a part of a (not shown) bayonet catch at its free end a (not shown) gas supply pipe can be connected.
  • a gas distribution chamber 26 is formed by the body 28.
  • the body 28, which can also be referred to as a wind box, is - contrary to known embodiments - designed as an independent component that can be detached from the gas purging plug. This makes it possible to connect the wind box 28 to a gas purging plug of the type described in the factory, the specific design of the wind box being able to be adapted to the local conditions. This is also a very significant advantage of the design of the gas purging plug.
  • thermocouple 32 is connected in section 28a, with which the temperature of the supplied gas can be measured.
  • a heating device 34 is also arranged, with which the treatment gas can be preheated.
  • the additional devices mentioned can be assembled stationary in the body 28 because the wind box 28 is reusable.
  • the wind box 28 is unscrewed from the gas connecting piece 18 and - after inserting a new gas purging plug - is put back on its gas connecting piece.
  • the wind box 28 can be part of a breakdown protection, the type of which is described in DE 38 30 871 C1. Of course, it is also possible to connect the above-mentioned break-through protection to the gas connecting piece 18 instead of the body 28.
  • wind box 28 can also be equipped with a plurality of gas supply lines, so that different gases and / or gas / solid mixtures can also be supplied.
  • the embodiment according to FIG. 3 differs from the embodiment according to FIG. 1 only in two features.
  • the free lower end of the connector 18 is tapered, which creates a separate gas distribution chamber 26.
  • the upper section 18b of the connector 18 is not cast into the ceramic matrix material 20, but is inserted into a corresponding annular groove and fixed there by means of a mortar 36.
  • the annular groove 35 can, for example, be milled out after the ceramic body 10 has been produced.
  • FIGS. 1 to 3 show frustoconical gas purging plugs
  • the purging plug according to FIG. 4 essentially has a rectangular cross section.
  • the cross-sectional area at the lower end is slightly larger than at the upper end.
  • the sink according to Figure 4 is a sink with undirected porosity.
  • a gas-permeable insert 38 is inserted into a sealed refractory receptacle 40.
  • the insert 38 ends at a distance from the bottom 14 of the ceramic body 10.
  • a gas distribution chamber 26 At the lower end of the insert 38 there is a gas distribution chamber 26, to which the gas connecting piece 18 continues downward, which in turn runs with its upper section 18a in the matrix material 20 and whose lower portion 18b protrudes above the floor 14.
  • the upper end of the gas distribution chamber 26 is covered here by a perforated plate 18c, and the section 18a is tapered on the bottom side, as is the section 18b.
  • a gas-permeable plug 42 made of refractory ceramic is used in the gas distribution chamber 26.
  • This embodiment is also particularly suitable when the gas distribution chamber 26 has no cover and instead of the section 38 with undirected porosity, gas channels run from the plug 42 to the upper end face 16 of the sink.
  • reinforcing elements on the gas connection piece 18 can be dispensed with here.
  • the components can be connected to the lower end of the gas outlet connection 18, as explained with reference to FIGS. 1 to 3.
  • the free lower end of the gas connecting piece 18 can also be used as an adapter for connecting a pull-out device for the gas purging plug if the purging plug is to be pulled out of an associated perforated block or the bottom of a metallurgical vessel after wear.
  • the components integrated in the refractory ceramic preferably have a coefficient of thermal expansion that comes as close as possible to that of the matrix material of the sink.
  • flushing stone geometry is not restricted to the exemplary embodiments shown. It can be varied as required.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Colloid Chemistry (AREA)
  • Detergent Compositions (AREA)

Abstract

The invention relates to a gas bubble brick for metallurgical vessels, having a gas connection branch (18) on the lower, gas-inlet end, the gas connection branch being fixed in the matrix material (20) of the gas bubble brick. <IMAGE>

Description

Die Erfindung betrifft einen Gasspülstein für metallurgische Gefäße gemäß Oberbegriff von Anspruch 1.The invention relates to a gas purging plug for metallurgical vessels according to the preamble of claim 1.

Eine Übersicht über unterschiedliche Bauformen von Gasspülsteinen gibt die Radex-Rundschau 1987, 288.The Radex-Rundschau 1987, 288 provides an overview of the different types of gas purging plug.

Üblicherweise sind die Gasspülsteine blechummantelt, wobei der Boden des Blechmantels im Abstand zum Boden des keramischen Teils des Gasspülsteins verläuft, so daß eine Gasverteilkammer ausgebildet wird, und sich an den Boden des Blechmantels ein Gasanschlußrohr anschließt (DE 36 23 609 C1).The gas purging plugs are usually sheet-metal-coated, the bottom of the sheet metal casing running at a distance from the bottom of the ceramic part of the gas purging plug, so that a gas distribution chamber is formed, and a gas connection pipe connects to the bottom of the sheet metal casing (DE 36 23 609 C1).

Wie sich der DE 38 33 502 A1 entnehmen läßt, umfaßt ein solcher Gasspülstein verschiedene Metallteile und ist deshalb aufwendig. Zur Vereinfachung wird in der DE 38 33 502 A1 vorgeschlagen, den Gasverteilraum so auszubilden, daß er zum gaseinlaßseitigen Ende hin offen ist und dort eine Dichtfläche ausgebildet ist, die sich um die entsprechende Öffnung erstreckt und an der ein, mit einem Gasanschluß versehenes Verschlußventil lösbar befestigt werden kann. Auf diese Weise kann der Verschlußteil zwar wiederverwendet werden, nach wie vor sind jedoch eine Vielzahl von Metallteilen notwendig. Auch die Anbringung einer sogenannten Durchbruchsicherung, wie sie in der DE 38 30 871 C1 beschrieben ist, ist bei dem bekannten Gasspülstein nur bedingt möglich. Schließlich wird das Ausbrechen des Gasspülsteins nach dessen Verschleiß erschwert.As can be seen from DE 38 33 502 A1, such a gas purging plug comprises various metal parts and is therefore complex. For simplification, it is proposed in DE 38 33 502 A1 to design the gas distribution space in such a way that it is open towards the gas inlet end and there is formed a sealing surface which extends around the corresponding opening and to which a closure valve provided with a gas connection can be detachably fastened. In this way, the closure part can be reused, but a large number of metal parts are still necessary. The installation of a so-called breakthrough protection, as described in DE 38 30 871 C1, is only possible to a limited extent in the known gas purging plug. Finally, the gas purging plug is difficult to break out after it has worn out.

Der Erfindung liegt insoweit die Aufgabe zugrunde, einen Gasspülstein der eingangs genannten Art konstruktiv zu vereinfachen und so zu gestalten, daß beliebige Baueinheiten, wie ein Windkasten oder eine Durchbruchsicherung ohne weiteres anschließbar und der Spülstein nach seinem Verschleiß leicht wieder demontierbar ist.In this respect, the invention is based on the object of structurally simplifying a gas purging plug of the type mentioned at the outset and designing it in such a way that any structural units, such as a wind box or a breakthrough protection, can be easily connected and the purging plug can be easily dismantled again after it has worn out.

Dazu wird ein Gasspülstein mit den Merkmalen des Hauptanspruches vorgeschlagen.For this purpose, a gas purging plug with the features of the main claim is proposed.

Bei der Gasspülsteinvorrichtung nach der US-A-4 836 433 verläuft der Gasanschlußstutzen mit offenem Querschnitt in den Spülblock. Unterhalb des Spülblocks liegt der Gasanschlußstutzen in einer feuerfesten Ausmauerung.In the gas purging device according to US-A-4 836 433, the gas connecting piece runs with an open cross section into the purging block. Below the flushing block, the gas connection piece is in a refractory lining.

Dagegen schlägt die Erfindung vor:
Der Gasanschlußstutzen wird zumindest teilweise in das Innere des keramischen Teils des Gasspülsteins verlegt und dort festgelegt. Er wird gleichzeitig so ausgebildet, daß an den Gasanschlußstutzen weitere Bauteile angeschlossen werden können. Dies kann ein Gasanschlußrohr sein, das selbst zum Beispiel Bestandteil einer Durchbruchsicherung ist, wie sie in der DE 38 30 871 C1 beschrieben ist.In contrast, the invention proposes:
The gas connection piece is at least partially laid in the interior of the ceramic part of the gas purging plug and fixed there. It is designed at the same time so that further components can be connected to the gas connection piece. This can be a gas connection pipe, which itself is part of a breakdown protection, as described in DE 38 30 871 C1.

Dadurch, daß der zylindrische Gasanschlußstutzen vollständig im (gasdurchlässigen) keramischen Matrixmaterial einliegt, läßt sich quasi "in-situ" eine Gasverteilkammer dadurch ausbilden, daß der Gasanschlußstutzen nach unten über den Boden des keramischen Teils des Gasspülsteins vorragt, wobei die Gasverteilkammer zwischen dem freien Ende des Gasanschlußstutzens und dem Boden des keramischen Teils des Gasspülsteins ausgebildet wird.Because the cylindrical gas connection piece lies completely in the (gas-permeable) ceramic matrix material, a gas distribution chamber can be formed quasi "in-situ" in that the gas connection piece protrudes downward over the bottom of the ceramic part of the gas purging plug, the gas distribution chamber being located between the free end the gas connection piece and the bottom of the ceramic part of the gas purging plug is formed.

Der gasdurchlässige Teil (zum Beispiel die Gaskanäle) verläuft dabei vom Boden des Gasspülsteins bis zu dessen Stirnfläche.The gas-permeable part (for example the gas channels) runs from the bottom of the gas purging plug to its end face.

Ebenso kann eine größere Gasverteilkammer aber auch am gasauslaßseitigen Ende des Gasanschlußstutzens angeordnet werden. Sie kann entweder hohl sein (zum Beispiel durch Ausbrennen eines entsprechenden Füllkörpers, der während der Herstellung das entsprechende Volumen ausfüllte) oder durch einen perforierten Deckel abgedeckt werden. Ebenso ist es möglich, einen gasdurchlässigen, vorzugsweise keramischen, feuerfesten Stopfen in der Gasverteilkammer anzuordnen. Dieser kann gleichzeitig als "Durchbruchsicherung" gegen möglicherweise infiltrierende Metallschmelze wirken, indem der Metallschmelzestrom verzweigt wird und so rascher "einfriert". Ebenso kann der Einsatz auch zur Ermittlung der Reststeinstärke genutzt werden, wenn er zum Beispiel eine andere Wärmeleitfähigkeit wie das Matrixmaterial aufweist und so eine Erosion bis zu dieser Stelle durch unterschiedliche "Glühfarbe" erkannt werden kann.Likewise, a larger gas distribution chamber can also be arranged at the gas outlet end of the gas connection piece. It can either be hollow (e.g. through Burn out a corresponding filler, which filled the corresponding volume during manufacture) or be covered by a perforated lid. It is also possible to arrange a gas-permeable, preferably ceramic, refractory plug in the gas distribution chamber. This can also act as a "breakthrough protection" against possibly infiltrating molten metal by branching the molten metal stream and thus "freezing" more quickly. The insert can also be used to determine the residual stone thickness if, for example, it has a different thermal conductivity than the matrix material and erosion up to this point can be recognized by different "glow color".

Es ist offensichtlich, daß bei diesen Ausführungsformen gleichzeitig folgende Vorteile erzielt werden:

  • Eine Blechummantelung kann entfallen, da der Gasanschlußstutzen direkt im keramischen Material festgelegt wird.
  • Da ein Blechmantel fehlt, kann der Spülstein direkt mit einem zugehörigen Lochstein konfektioniert werden, beispielsweise durch unmittelbares Vergießen des Spülsteins in einen Lochstein. Es braucht dann nur noch ein Körper in das metallurgische Gefäß eingebaut werden.
  • Die am gaseinlaßseitigen (unteren) Ende des Gasanschlußstutzens angeordnete Einrichtung zum gasdichten Anschluß weiterer Bauteile kann - nach Lösen dieser Bauteile - als Adapter zum Anschluß einer Ausziehvorrichtung genutzt werden, über die der Gasspülstein nach Verschleiß aus der bodenseitigen Verankerung im metallurgischen Schmelzgefäß herausgezogen werden kann.
It is evident that the following advantages are simultaneously achieved in these embodiments:
  • A sheet metal jacket can be omitted, since the gas connection piece is fixed directly in the ceramic material.
  • Since a sheet metal jacket is missing, the sink can be assembled directly with an associated perforated brick, for example by pouring the sink directly into a perforated brick. Then only one body needs to be installed in the metallurgical vessel.
  • The device for gas-tight connection of further components arranged at the gas inlet (lower) end of the gas connecting piece can - after loosening these components - be used as an adapter for connecting a pull-out device, via which the gas purging plug can be pulled out of the base-side anchoring in the metallurgical melting vessel after wear.

Aus der EP 0 070 197 A1 (Figur 2) ist ein Gasspülstein bekannt, bei dem unterhalb des keramischen Körpers eine Gasverteilkammer ausgebildet ist, an die sich ein Gasanschlußrohr anschließt. Diese Baueinheit aus Gasverteilkammer und Gasanschlußrohr kann zwar als Gasanschlußstutzen angesehen werden, verläuft aber unterhalb des keramischen Körpers des Spülsteins. Daraus folgt, daß keine innige mechanische Verankerung zwischen dem Gasanschlußstutzen und dem keramischen Körper besteht. Dadurch wird es bei der bekannten Ausführungsform unmöglich, den Spülstein nach dessen Verschleiß über den Gasanschlußstutzen zum Beispiel aus einem Lochstein herauszuziehen.A gas purging plug is known from EP 0 070 197 A1 (FIG. 2), in which a gas distribution chamber is formed below the ceramic body, to which a gas connection pipe connects. This assembly of gas distribution chamber and gas connection pipe can be viewed as a gas connection piece, but runs below the ceramic body of the sink. It follows that there is no intimate mechanical anchoring between the gas connection piece and the ceramic body. This makes it impossible in the known embodiment to pull the sink after its wear over the gas connection piece, for example from a perforated brick.

Die erfindungsgemäße Gestaltung eröffnet zahlreiche weitere Vorteile.The design according to the invention opens up numerous other advantages.

So kann an die Einrichtung am gaseinlaßseitigen Ende des Gasanschlußstutzens ein (weiterer) lösbarer Windkasten (Gasverteilkammer) angeschlossen werden, an den selbst wiederum eine Gaszuführleitung anschließbar ist. Der Anschluß des Windkastens kann ohne weiteres werkseitig erfolgen. Dieser Windkasten kann beispielsweise mit Thermoelementen zur Gastemperaturmessung oder mit einer Vorrichtung zur Gaserwärmung bestückt werden. Dadurch, daß bei dieser Gestaltung die Gasverteilkammer lösbar ist, läßt sie sich vor der Demontage eines verschlissenen Spülsteins abnehmen und wiederverwenden. Dies ist insbesondere in bezug auf die teuren Zusatzeinrichtungen von erheblichem wirtschaftlichen Vorteil. Außerdem kann die Bemaßung des Windkastens und der anschlußseitigen Verbindungselemente vom Anwender, zum Beispiel dem Stahlwerk, selbst bestimmt werden.For example, a (further) detachable wind box (gas distribution chamber) can be connected to the device at the gas inlet end of the gas connector, to which in turn a gas supply line can be connected. The wind box can be easily connected at the factory. This wind box can be equipped, for example, with thermocouples for gas temperature measurement or with a device for gas heating. Because the gas distribution chamber is detachable in this design, it can be removed and reused before disassembling a worn sink. This is of considerable economic advantage in particular with regard to the expensive additional devices. In addition, the dimensions of the wind box and the connection-side connecting elements can be determined by the user, for example the steelworks.

Dies gilt auch für die Zuordnung einer Durchbruchsicherung oder die Möglichkeit des Anschlusses unterschiedlicher Gasleitungen, zum Beispiel für verschiedene Gase. Diese separate, vom Gasspülstein lösbare Baueinheit kann schließlich auch dazu genutzt werden, ein Manometer aufzunehmen, um den Gasdruck zu messen.This also applies to the assignment of a breakdown protection or the possibility of connecting different gas lines, for example for different gases. This separate unit, which can be detached from the gas purging plug, can finally also be used to record a pressure gauge in order to measure the gas pressure.

Die mechanische Verankerung des Gasanschlußstutzens im keramischen Matrixmaterial kann auf unterschiedliche Art und Weise erfolgen.The mechanical connection of the gas connection piece in the ceramic matrix material can be done in different ways.

Nach einer ersten Ausführungsform wird vorgeschlagen, zumindest den gasauslaßseitigen Abschnitt des Gasanschlußstutzens beim Gießen des Gasspülsteins mit einzusetzen. Dabei ist es vorteilhaft, wenn der entsprechende Abschnitt des Stutzens außenseitig Armierungselemente aufweist die die mechanische Verankerung zwischen dem Stutzen und der Keramik des Spülsteins verbessern. Ebenso kann die Festlegung des Stutzens dadurch begünstigt werden, daß er am oberen Endabschnitt Löcher aufweist, die beim Gießen vom Matrixmaterial durchdrungen werden.According to a first embodiment, it is proposed to use at least the gas outlet-side section of the gas connecting piece when casting the gas purging plug. It is advantageous if the corresponding section of the nozzle has reinforcing elements on the outside which improve the mechanical anchoring between the nozzle and the ceramic of the sink. Likewise, the definition of the nozzle can be favored in that it has holes at the upper end portion, which are penetrated by the matrix material during casting.

Bei einem gepreßten Gasspülstein wird man vorzugsweise am fertigen Produkt eine ringförmige bodenseitige Nut einbringen und den entsprechenden zylinderförmigen Abschnitt des Gasanschlußstutzens später in dieser Nut einmörteln. Auch hier sind Armierungselemente zur Verbesserung der Verankerung von Vorteil.In the case of a pressed gas purging plug, an annular bottom groove is preferably introduced in the finished product and the corresponding cylindrical section of the gas connection piece is later mortared into this groove. Reinforcing elements to improve the anchoring are also advantageous here.

Insbesondere, wenn der Windkasten direkt mit ausgebildet werden soll, sieht eine Ausführungsform vor, den Gasanschlußstutzen am unteren Abschnitt verjüngt auszubilden und die Anschlußeinrichtung am freien Ende dieses verjüngten Abschnittes vorzusehen.In particular, if the wind box is to be formed directly, one embodiment provides for the gas connecting piece to be tapered at the lower section and to provide the connecting device at the free end of this tapered section.

Die Einrichtung zum gasdichten Anschluß an den Windkasten (die Gasverteilkammer) und/oder eine Gaszuführleitung kann dann beispielsweise aus einem Gewinde oder einem Bajonettverschluß bestehen. Ebenso ist es aber auch möglich, den Gasanschlußstutzen endseitig mit einem Flansch auszubilden, der zusammen mit einem Flansch des benachbarten Bauteils zu einer üblichen Flanschverbindung führt.The device for gas-tight connection to the wind box (the gas distribution chamber) and / or a gas supply line can then consist, for example, of a thread or a bayonet fitting. However, it is also possible to form the end of the gas connecting piece with a flange which, together with a flange of the adjacent component, leads to a conventional flange connection.

Allen Ausführungsformen ist gemeinsam, daß mit Hilfe eines einfachen, insbesondere metallischen Gasanschlußstutzens, der zumindest teilweise im keramischen Matrixmaterial des Spülsteins festgelegt wird, eine universelle Anschlußmöglichkeit für Gaszuführleitungen, Gasverteilkammern (mit oder ohne Zusatzeinrichtungen) und/oder Ausziehvorrichtungen geschaffen wird. Der Gasanschlußstutzen ist nicht nur einfach aufgebaut, sondern auch leicht zu positionieren. Umbauten am Gasspülstein sind nicht notwendig. Eine Blechummantelung kann entfallen.All embodiments have in common that with the help of a simple, in particular metallic gas connection piece, which is at least partially fixed in the ceramic matrix material of the sink, a universal connection possibility for gas supply lines, gas distribution chambers (with or without additional devices) and / or pull-out devices is created. The gas connector is not only simple, but also easy to position. Modifications to the gas purging plug are not necessary. A sheet metal jacket can be omitted.

Der Gasspülstein kann mit gerichteter oder ungerichteter Porosität ausgebildet sein. Im Fall ungerichteter Porosität wird er vorzugsweise zweiteilig gestaltet, wobei der poröse Abschnitt innen angeordnet wird und von einem dichten keramischen Material umgeben ist.The gas purging plug can be designed with directional or non-directional porosity. In the case of non-directional porosity, it is preferably designed in two parts, the porous section being arranged on the inside and surrounded by a dense ceramic material.

Weitere Merkmale der Erfindung ergeben sich aus den Merkmalen der Unteransprüchen sowie den sonstigen Anmeldungsunterlagen.Further features of the invention result from the features of the subclaims and the other application documents.

Die Erfindung wird nachstehend beispielhaft anhand verschiedener Ausführungsbeispiele beschrieben. Dabei zeigen - jeweils in stark schematisierter Darstellung -

Figur 1:
einen Längsschnitt durch eine erste Ausführungsform eines Gasspülsteins
Figur 2:
den Gasspülstein nach Figur 1 mit angeschlossenem Windkasten
Figur 3:
eine zweite Ausführungsform des Gasspülsteins im Längsschnitt
Figur 4:
eine dritte Ausführungsform des Gasspülsteins im Längsschnitt
In den Figuren sind gleiche oder gleichwirkende Bauteile mit gleichen Bezugsziffern dargestellt.The invention is described below by way of example using various exemplary embodiments. Here show - each in a highly schematic representation -
Figure 1:
a longitudinal section through a first embodiment of a gas purging plug
Figure 2:
the gas purging plug according to Figure 1 with attached wind box
Figure 3:
a second embodiment of the gas purging plug in longitudinal section
Figure 4:
a third embodiment of the gas purging plug in longitudinal section
In the figures, the same or equivalent components are shown with the same reference numerals.

Der keramische Körper des Gasspülsteins gemäß Figur 1 trägt das Bezugszeichen 10.The ceramic body of the gas purging plug according to FIG. 1 bears the reference number 10.

Es handelt sich um einen Gasspülstein mit sogenannter gerichteter Porosität. Die Gaskanäle 12 verlaufen im Abstand zueinander vertikal vom Boden 14 zur Stirnfläche 16 des keramischen Körpers 10, und zwar hier, wie dargestellt, lediglich etwa in der Mitte.It is a gas purging plug with so-called directional porosity. The gas channels 12 run at a distance from one another vertically from the bottom 14 to the end face 16 of the ceramic body 10, specifically here, as shown, only approximately in the middle.

Ein zylindrischer Gasanschlußstutzen 18 erstreckt sich um die Gaskanäle 12 herum in das feuerfeste keramische Matrixmaterial 20 des Körpers 10 und ist dort eingegossen. Zur besseren Verankerung im Matrixmaterial 20 weist der obere Abschnitt 18a des Stutzens 18 außenseitig Armierungsanker 22 auf.A cylindrical gas connector 18 extends around the gas channels 12 into the refractory ceramic Matrix material 20 of the body 10 and is cast in there. For better anchoring in the matrix material 20, the upper section 18a of the connector 18 has reinforcing anchors 22 on the outside.

Nach unten steht der Stutzen 18 über den Boden 14 ein Stück vor. Dabei ist der überstehende untere Abschnitt 18b des Stutzens 18 mit einem Außengewinde 24 ausgebildet.At the bottom, the connector 18 protrudes a little above the base 14. The protruding lower section 18b of the connector 18 is formed with an external thread 24.

Eine Blechummantelung des keramischen Körpers 10 zur Ausbildung eines Gasanschlußstutzens und/oder einer Gasverteilkammer ist demzufolge bei dieser Ausführungsform nicht notwendig.A sheet metal casing of the ceramic body 10 to form a gas connection piece and / or a gas distribution chamber is therefore not necessary in this embodiment.

Vielmehr kann der Raum 26 innerhalb des unteren Abschnittes 18b des Stutzens 18 als Gasverteilkammer genutzt werden, wobei über das Außengewinde 24 ein Gaszuführrohr anschließbar ist.Rather, the space 26 within the lower section 18b of the connector 18 can be used as a gas distribution chamber, a gas supply pipe being connectable via the external thread 24.

Bei dieser Ausführungsform kann der Stutzen 18 an seinem unteren freien Ende auch ein verjüngtes Anschlußstück aufweisen, wie es in Figur 3 dargestellt ist und später noch erläutert wird.In this embodiment, the connecting piece 18 can also have a tapered connecting piece at its lower free end, as is shown in FIG. 3 and will be explained later.

Vor allen Dingen ermöglicht die Ausführungsform nach Figur 1 aber auch den Anschluß eines - unabhängigen - Gasverteilraumes, gegebenenfalls mit weiteren Zusatzeinrichtungen wie das Ausführungsbeispiel nach Figur 2 zeigt.Above all, the embodiment according to FIG. 1 also enables the connection of an - independent - gas distribution space, optionally with further additional devices as the embodiment according to FIG. 2 shows.

Dabei ist ein im wesentlichen zylinderförmiger metallischer Körper 28, der an seinem oberen Ende ein Innengewinde 30 aufweist, mit dem Außengewinde 24 des Stutzens 18 gasdicht verbunden.An essentially cylindrical metallic body 28, which has an internal thread 30 at its upper end, is connected in a gas-tight manner to the external thread 24 of the connector 18.

Ausgehend vom Innengewinde 30 verläuft der Körper 28 zunächst zylinderförmig und erweitert sich dann - im Querschnitt trapezförmig (Teil 28a) - bevor sich ein weiterer, verjüngter zylinderförmiger Abschnitt 28b anschließt, der an seinem freien Ende einen Teil eines (nicht dargestellten) Bajonettverschlusses aufweist, an den ein (nicht dargestelltes) Gaszuführungsrohr anschließbar ist.Starting from the internal thread 30, the body 28 initially runs in a cylindrical shape and then widens - in trapezoidal cross section (part 28a) - before another, tapered cylindrical section 28b follows, which has a part of a (not shown) bayonet catch at its free end a (not shown) gas supply pipe can be connected.

Durch den Körper 28 wird eine Gasverteilkammer 26 ausgebildet. Der Körper 28, der auch als Windkasten bezeichnet werden kann, ist also - entgegen bekannten Ausführungsformen - als selbständiges, vom Gasspülstein lösbares Bauteil gestaltet. Dies ermöglicht es, den Windkasten 28 werkseitig an einen Gasspülstein der beschriebenen Art anzuschließen, wobei die konkrete Ausbildung des Windkastens an die örtlichen Gegebenheiten angepaßt werden kann. Auch hierin liegt ein ganz wesentlicher Vorteil der beschriebenen Gestaltung des Gasspülsteins.A gas distribution chamber 26 is formed by the body 28. The body 28, which can also be referred to as a wind box, is - contrary to known embodiments - designed as an independent component that can be detached from the gas purging plug. This makes it possible to connect the wind box 28 to a gas purging plug of the type described in the factory, the specific design of the wind box being able to be adapted to the local conditions. This is also a very significant advantage of the design of the gas purging plug.

Wie sich Figur 2 weiter entnehmen läßt, ist im Beieich des Abschnittes 28a ein Thermoelement 32 angeschlossen, mit dem die Temperatur des zugeführten Gases gemessen werden kann.As can be seen in FIG. 2, a thermocouple 32 is connected in section 28a, with which the temperature of the supplied gas can be measured.

Im Teil 28b ist darüber hinaus eine Heizeinrichtung 34 angeordnet, mit der das Behandlungsgas vorgewärmt werden kann.In part 28b, a heating device 34 is also arranged, with which the treatment gas can be preheated.

Ebenso wäre es möglich, innerhalb des Körpers 28 ein Manometer anzuordnen, um den Gasdruck zu bestimmen.It would also be possible to arrange a manometer within the body 28 to determine the gas pressure.

Dabei können die genannten Zusatzeinrichtungen stationär im Körper 28 konfektioniert werden, weil der Windkasten 28 wiederverwendbar ist.The additional devices mentioned can be assembled stationary in the body 28 because the wind box 28 is reusable.

Nach Verschleiß des Gasspülsteins wird der Windkasten 28 vom Gasanschlußstutzen 18 abgeschraubt und - nach Einsetzen eines neuen Gasspülsteins - auf dessen Gasanschlußstutzen wieder aufgesetzt.After wear of the gas purging plug, the wind box 28 is unscrewed from the gas connecting piece 18 and - after inserting a new gas purging plug - is put back on its gas connecting piece.

Der Windkasten 28 kann dabei Bestandteil einer Durchbruchsicherung sein, deren Bauart in der DE 38 30 871 C1 beschrieben ist. Selbstverständlich ist es auch möglich anstelle des Körpers 28 die genannte Durchbruchsicherung an den Gasanschlußstutzen 18 anzuschließen.The wind box 28 can be part of a breakdown protection, the type of which is described in DE 38 30 871 C1. Of course, it is also possible to connect the above-mentioned break-through protection to the gas connecting piece 18 instead of the body 28.

Ein weiterer Vorteil besteht darin, daß der Windkasten 28 auch mit mehreren Gaszuführleitungen bestückt werden kann, so daß auch unterschiedliche Gase und/oder Gas-/Feststoffgemische zugeführt werden können.Another advantage is that the wind box 28 can also be equipped with a plurality of gas supply lines, so that different gases and / or gas / solid mixtures can also be supplied.

Die Ausführungsform nach Figur 3 unterscheidet sich lediglich in zwei Merkmalen von der Ausführungsform nach Figur 1.The embodiment according to FIG. 3 differs from the embodiment according to FIG. 1 only in two features.

Zum einen ist das freie untere Ende des Stutzens 18 verjüngt ausgebildet, wodurch eine separate Gasverteilkammer 26 entsteht. Zum anderen ist der obere Abschnitt 18b des Stutzens 18 nicht in das keramische Matrixmaterial 20 eingegossen, sondern in eine korrespondierende Ringnut eingesetzt und dort über einen Mörtel 36 festgelegt. Die Ringnut 35 kann nach Herstellung des keramischen Körpers 10 beispielsweise ausgefräst werden.On the one hand, the free lower end of the connector 18 is tapered, which creates a separate gas distribution chamber 26. On the other hand, the upper section 18b of the connector 18 is not cast into the ceramic matrix material 20, but is inserted into a corresponding annular groove and fixed there by means of a mortar 36. The annular groove 35 can, for example, be milled out after the ceramic body 10 has been produced.

Während die Ausführungsbeispiele nach den Figuren 1 bis 3 kegelstumpfförmige Gasspülsteine zeigen, weist der Spülstein nach Figur 4 im wesentlichen einen Rechteckquerschnitt auf.While the exemplary embodiments according to FIGS. 1 to 3 show frustoconical gas purging plugs, the purging plug according to FIG. 4 essentially has a rectangular cross section.

Dabei ist die Querschnittsfläche am unteren Ende geringfügig größer als am oberen Ende.The cross-sectional area at the lower end is slightly larger than at the upper end.

Ein weiterer Unterschied besteht darin, daß der Spülstein nach Figur 4 ein Spülstein mit ungerichteter Porosität ist. Zu diesem Zweck ist ein gasdurchlässiger Einsatz 38 in eine dichte feuerfeste Aufnahme 40 eingesetzt. Der Einsatz 38 endet mit Abstand zum Boden 14 des keramischen Körpers 10. An das untere Ende des Einsatzes 38 schließt sich eine Gasverteilkammer 26 an, an die sich nach unten der Gasanschlußstutzen 18 fortsetzt,der mit seinem oberen Abschnitt 18a wiederum im Matrixmaterial 20 verläuft und dessen unterer Abschnitt 18b über den Boden 14 vorsteht.Another difference is that the sink according to Figure 4 is a sink with undirected porosity. For this purpose, a gas-permeable insert 38 is inserted into a sealed refractory receptacle 40. The insert 38 ends at a distance from the bottom 14 of the ceramic body 10. At the lower end of the insert 38 there is a gas distribution chamber 26, to which the gas connecting piece 18 continues downward, which in turn runs with its upper section 18a in the matrix material 20 and whose lower portion 18b protrudes above the floor 14.

Das obere Ende der Gasverteilkammer 26 wird hier von einer durchbrochenen Platte 18c abgedeckt, und der Abschnitt 18a ist bodenseitig ebenso wie der Abschnitt 18b demgegenüber verjüngt ausgebildet.The upper end of the gas distribution chamber 26 is covered here by a perforated plate 18c, and the section 18a is tapered on the bottom side, as is the section 18b.

Zusätzlich ist in der Gasverteilkammer 26 ein gasdurchlässiger Stopfen 42 aus feuerfester Keramik eingesetzt. Diese Ausführungsform ist insbesondere auch dann geeignet, wenn die Gasverteilkammer 26 keinen Deckel aufweist und anstelle des Abschnitts 38 mit ungerichteter Porosität Gaskanäle vom Stopfen 42 zur oberen Stirnfläche 16 des Spülsteins verlaufen.In addition, a gas-permeable plug 42 made of refractory ceramic is used in the gas distribution chamber 26. This embodiment is also particularly suitable when the gas distribution chamber 26 has no cover and instead of the section 38 with undirected porosity, gas channels run from the plug 42 to the upper end face 16 of the sink.

Aufgrund der beschriebenen Gestaltung kann hier auf Armierungselemente am Gasanschlußstutzen 18 verzichtet werden.Because of the design described, reinforcing elements on the gas connection piece 18 can be dispensed with here.

An das untere Ende des Gasauslaßstutzens 18 können die Bauteile angeschlossen werden, wie anhand der Figuren 1 bis 3 erläutert.The components can be connected to the lower end of the gas outlet connection 18, as explained with reference to FIGS. 1 to 3.

Allen Ausführungsformen ist gemeinsam, daß das freie untere Ende des Gasanschlußstutzens 18 auch als Adapter zum Anschluß einer Ausziehvorrichtung für den Gasspülstein genutzt werden kann, wenn der Spülstein aus einem zugehörigen Lochstein oder dem Boden eines metallurgischen Gefäßes nach Verschleiß herausgezogen werden soll.All embodiments have in common that the free lower end of the gas connecting piece 18 can also be used as an adapter for connecting a pull-out device for the gas purging plug if the purging plug is to be pulled out of an associated perforated block or the bottom of a metallurgical vessel after wear.

Durch die sichere und feste Verankerung des Stutzens 18 im Matrixmaterial 20 können hohe Kräfte in den Spülstein übertragen werden, wodurch es möglich wird, vorkonfektionierte Baueinheiten von Spülstein und Lochstein gleichzeitig herauszuziehen. Dabei weisen die in der feuerfesten Keramik integrierten Bauteile vorzugsweise einen Wärmeausdehnungskoeffizienten auf, der denen des Matrixmaterials des Spülsteins so nahe wie möglich kommt.Due to the secure and firm anchoring of the connector 18 in the matrix material 20, high forces can be transmitted into the sink, which makes it possible to pull out pre-assembled units from the sink and perforated block at the same time. The components integrated in the refractory ceramic preferably have a coefficient of thermal expansion that comes as close as possible to that of the matrix material of the sink.

Die Spülsteingeometrie ist nicht auf die dargestellten Ausführungsbeispiele beschränkt. Sie kann je nach Bedarf variiert werden.The flushing stone geometry is not restricted to the exemplary embodiments shown. It can be varied as required.

Claims (11)

  1. Gas purging plug for metallurgical vessels with a gas connection pipe (18), being mainly cylindrical and extending from the bottom (14) of the ceramic body (10) of the purging plug downwardly which presents at its gas-inlet end (18b) a device (24) for gas-tight connection to a gas distribution chamber (28) or a gas feed line which extends in the direction of the upper end surface (16) of the purging plug into its matrix material and which follows with its gas outlet end (18a) a gas permeable part (12, 38) of the purging plug, characterized in that the gas permeable part (12, 38) of the purging plug continues the gas outlet end (18a) of the gas connection pipe and into the gas connection pipe (18) down to the bottom (14) of the purging plug, while the gas connection pipe (18) is anchored in the matrix material of the gas purging plug.
  2. Gas purging plug in accordance with claim 1, in which the downwardly projecting section (18b) of the gas connection pipe (18) has, at its free end, a tapered cross section.
  3. Gas purging plug in accordance with claim 1 or 2, in which at least the gas outlet-side section (18a) of the gas connection pipe (18) is casted in the matrix material (20) of the ceramic body (10) of the gas purging plug.
  4. Gas purging plug in accordance with claim 1 or 2, in which at least the gas outlet-side section (18a) of the gas connection pipe (18) is anchored in a corresponding groove (35), which extends from the bottom (14) into the matrix material (20), and is fixed with mortar (36).
  5. Gas purging plug in accordance with one of the claims 1 through 4, in which the device (24) consists of a threaded section.
  6. Gas purging plug in accordance with one of the claims 1 through 4, in which the device (24) consists of a bayonet fastener.
  7. Gas purging plug in accordance with one of the claims 1 through 4, in which the device (24) consists of flange of a flanged connection.
  8. Gas purging plug in accordance with one of the claims 1 through 7, in which the section of the gas connection pipe (18) extending in the matrix material (20) has, on the outside, reinforcing anchoring means (22) fixed in the matrix material (20).
  9. Gas purging plug in accordance with one of the claims 1 through 8, in which the portion of the gas connection pipe (18) extending in the matrix material (20) has perforations, being filled with the matrix material.
  10. Gas purging plug in accordance with one of the claims 1 through 9, in which the upper end of the gas connection pipe (18) opens into a gas distribution chamber (42).
  11. Gas purging plug in accordance with claim 10 in which a gas-permeable ceramic plug (42) is inserted into the gas distribution chamber (42).
EP92110551A 1991-06-28 1992-06-23 Gas flushing brick Expired - Lifetime EP0521371B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4121329 1991-06-28
DE4121329A DE4121329C2 (en) 1991-06-28 1991-06-28 Gas purging stone

Publications (2)

Publication Number Publication Date
EP0521371A1 EP0521371A1 (en) 1993-01-07
EP0521371B1 true EP0521371B1 (en) 1994-12-21

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EP92110551A Expired - Lifetime EP0521371B1 (en) 1991-06-28 1992-06-23 Gas flushing brick

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US (1) US5312092A (en)
EP (1) EP0521371B1 (en)
AT (1) ATE116007T1 (en)
CA (1) CA2072483C (en)
DE (2) DE4121329C2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9301563U1 (en) * 1993-02-04 1993-03-25 Beck u. Kaltheuner Feuerfeste Erzeugnisse GmbH & Co KG, 5970 Plettenberg Ceramic sink for steel treatment pans
DE4335643C1 (en) * 1993-10-15 1994-10-27 Mannesmann Ag Method and apparatus for introducing gases into metal melts
US7968047B2 (en) 2005-02-10 2011-06-28 Wahl Refractory Solutions, Llc Blaster nozzle
CA2871323A1 (en) * 2012-05-18 2013-11-21 Vesuvius Crucible Company Purge plug
ES2592174T3 (en) * 2012-08-27 2016-11-28 Refractory Intellectual Property Gmbh & Co. Kg Gas purge element with corresponding gas supply line
US10160067B2 (en) * 2013-05-10 2018-12-25 Illinois Tool Works Inc. Data acquisition using a purge plug

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL74999C (en) * 1952-01-21
AU541441B2 (en) * 1981-07-15 1985-01-10 Nippon Steel Corporation Bottom blowing nozzle embedded in a refractory block
GB2120369A (en) * 1982-05-20 1983-11-30 Ksr Int Ltd An improved metallurgical lance
GB2122532A (en) * 1982-05-20 1984-01-18 K S R International Limited Manufacture of gas-permeable plugs
DE3622609A1 (en) * 1986-07-05 1988-01-07 Bayer Ag METHOD FOR THE PRODUCTION OF LIQUID CRYSTALLINE NCO-POLYURETHANE PRE-POLYMERS AND THE USE THEREOF
DE3623609C1 (en) * 1986-07-12 1988-01-21 Didier Werke Ag Gas purging device
US4836433A (en) * 1988-05-13 1989-06-06 Insul Company, Inc. Device for introducing stirring gas into molten metal in metered amount
US4840356A (en) * 1988-06-13 1989-06-20 Labate Michael D Externally replaceable stirring plug for molten metal vessels
DE3830871C1 (en) * 1988-09-10 1989-11-02 Radex-Heraklith Industriebeteiligungs Ag, Wien, At
DE3833502A1 (en) * 1988-10-01 1990-04-05 Didier Werke Ag GASSPUELSTEIN
DE3833505C1 (en) * 1988-10-01 1990-02-15 Didier-Werke Ag, 6200 Wiesbaden, De

Also Published As

Publication number Publication date
EP0521371A1 (en) 1993-01-07
US5312092A (en) 1994-05-17
DE4121329C2 (en) 1995-09-07
CA2072483A1 (en) 1992-12-29
DE59201010D1 (en) 1995-02-02
ATE116007T1 (en) 1995-01-15
DE4121329C1 (en) 1992-05-21
CA2072483C (en) 1996-02-20

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