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Dokumentenidentifikation EP1272802 28.12.2006
EP-Veröffentlichungsnummer 0001272802
Titel HERSTELLUNGSVERFAHREN EINES KÜHLELEMENTS UND KÜHLELEMENT
Anmelder Outokumpu Technology Oy, Espoo, FI
Erfinder SAARINEN, Risto, FIN-02200 Espoo, FI;
LEPPÄNEN, Yrjö, FIN-28100 Pori, FI
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60124518
Vertragsstaaten AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LI, LU, MC, NL, PT, SE, TR
Sprache des Dokument EN
EP-Anmeldetag 21.03.2001
EP-Aktenzeichen 019214014
WO-Anmeldetag 21.03.2001
PCT-Aktenzeichen PCT/FI01/00280
WO-Veröffentlichungsnummer 2001071267
WO-Veröffentlichungsdatum 27.09.2001
EP-Offenlegungsdatum 08.01.2003
EP date of grant 15.11.2006
Veröffentlichungstag im Patentblatt 28.12.2006
IPC-Hauptklasse F27D 1/12(2006.01)A, F, I, 20051017, B, H, EP

Beschreibung[en]

The present invention relates to a method for manufacturing a cooling element according to the preamble of the appended claim 1. The invention also relates to a cooling element.

In connection with industrial furnaces, such as flash smelting furnaces, blast furnaces and electric furnaces used in the manufacturing of metals, or in connection with other metallurgic reactors, there are used cooling elements that are typically made of mainly copper. On the surface of the cooling element, there is often arranged a ceramic lining, for instance made of fireproof bricks. The cooling elements are typically water-cooled and thus provided with a cooling water channel system, so that the heat is transferred from the fireproof bricks through the housing of the cooling element to the cooling water. The cooling elements are used in extreme working conditions, where they are subjected to strong corrosion and erosion strain caused by the furnace atmosphere or contacts with the molten material. For an effective operation of the cooling element, it is important that the joint between the fireproof bricks and the cooling element is good, in which case an effectively heat-transferring contact is achieved. A drawback in the manufacturing of known cooling elements is the complexity of the manufacturing methods in attaching the ceramic/fireproof lining and the difficulty in obtaining a good contact between the ceramic lining and the element. Thus the cooling properties of the element cannot be fully utilized. This in turn results in an accelerated wearing of the lining.

The object of the invention is to realize a method for manufacturing a cooling element, by which method the drawbacks of the prior art can be avoided. Another object of the invention is to realize a cooling element that has a good contact between the ceramic lining and the element housing.

The invention is characterized by what is specified in the appended claims.

The arrangement according to the invention has several remarkable advantages. According to the method, there is obtained an extremely good contact between the ceramic lining elements and the cooling element housing. This maintains the temperature on the furnace-side of the cooling element and its ceramic parts, such as the fireproof bricks, sufficiently low, so that on the element surface there is created a so-called autogenous lining, comprising among others oxidic and/or sulfidic molten components. Now the wearing of the bricks, among others, is essentially slowed down, and the working life of the cooling element is increased. The method according to the invention is advantageous also as regards the manufacturing technology.

The invention is explained in more detail below, with reference to the appended drawing, where

  • Figure 1 illustrates the cooling element according to the invention, seen in cross-section.

The cooling element according to the invention comprises a housing part 1, provided with a channel system 4 for the cooling water circulation, and a lining formed of ceramic elements 2 applied to at least part of the surface of the housing part. The elements 2 of the ceramic lining are attached to the housing part 1 by means of a soldering agent in a way that results in a good thermal contact between the ceramic part and the housing part. The housing part 1 of the cooling element is typically made of copper, for example. Advantageously the housing part 1 of the cooling element is made for instance by casting, such as by draw casting. The housing part is provided with a channel system 6 for the cooling water circulation. Typically the channel system 4 is made by working, for instance by drilling, or in connection with the casting. At least one of the surfaces of the housing part 1 is provided with grooves 3,

where there are arranged elements 2 of the ceramic lining, typically fireproof bricks. In between the housing part 1 of the cooling element and the ceramic elements 2, there is made a joint enabling a good thermal contact by means of a soldering agent. The ceramic elements 2 are arranged to be held in the grooves in a shape-locking fashion, when the element is in a position where the groove opens downwardly. The grooves 3 can be for instance narrowing at the groove bottom towards the element surface, in which case the groove width W1 at the groove bottom is larger than the groove width W2 on the surface level. In a typical embodiment, the groove width W2 on the housing part surface level is 2 - 10 mm narrower than the groove width W1 at the groove bottom. The dimensional tolerance between the grooves 3 and the ceramic lining elements 2 is arranged to be such that the ceramic elements 2 can be inserted in the grooves 3 at the ends thereof, from the side of the element housing part. In between the ceramic elements 2 and the housing part 1, at least at the junction surfaces, there is applied an intermediate layer of the soldering agent, with a melting temperature that is lower than the melting temperature of the pieces to be joined. The soldering agent can be brought in the joint for instance in the form of foil or powder. The soldering agent can also be readily included in at least one of the parts to be joined. For instance, the elements of a ceramic lining can include a layer of soldering agent on the junction surface, in which case said elements are immersed in the molten soldering agent prior to installing them in the grooves of the housing part. In that case a soldering agent layer is absorbed in the surface of the ceramic lining element. The soldering agent can be for example a copper-based alloy with a melting temperature within the range of 400 - 700° C.

When the ceramic lining elements 2, for instance fireproof bricks, and the soldering agent are arranged in the groove, the junction area of at least the pieces to be joined together is heated up to a temperature where the soldering agent melts and makes a good thermal contact between the bricks and the housing part. It is also possible to bring more soldering agent to the junction area during the heating process. The heating can be carried out in the same step where a possible blocking joint of the cooling channel is made.

The cooling elements according to the invention can be used in several different applications. A typical target for the use of the cooling element according to the invention is for instance the ceiling of the lower furnace in a flash smelting furnace. There the shape of the grooves made in the cooling element prevents the ceramic lining elements from falling off the grooves, although the element is installed so that the lining side is directed downwards. The grooves do not have to be narrowed very much, because the temperature of the elements on the furnace side is higher than the temperature on the side that is directed away from the furnace, in which case thermal expansion causes pressure tension on the surface that is located on the furnace side. Typical measures for a cooling element according to the invention are: width: 0.25 - 1 m, length 1 - 2 m, and thickness of the housing part 100 - 200 mm, of which the thickness of the grooved part constitutes roughly a half.


Anspruch[de]
Verfahren zum Herstellen eines Kühlelements aufweisend ein Gehäuseteil und keramische Auskleidungselemente, die auf der Oberfläche des Gehäuseteils angeordnet sind,

dadurch gekennzeichnet, dass die keramischen Auskleidungselemente (2) mit dem Element-Gehäuseteil (1), das im Wesentlichen aus Kupfer gefertigt ist, durch Verwendung eines Lötmittels in der Verbindung zwischen den Auskleidungselementen und dem Gehäuseteil verbunden sind, wobei zumindest der Verbindungsbereich auf zumindest die Schmelztemperatur des Lötmittels erwärmt wird, so dass eine Verbindung mit einem guten thermischen Kontakt mit dem Element-Gehäuseteil (1) und den keramischen Auskleidungselementen (2) geschaffen wird, und die Oberfläche des Kühlelement-Gehäuseteils (1) mit Nuten versehen ist, in denen die keramischen Auskleidungselemente (2) eingepasst sind.
Verfahren nach Anspruch 1,

dadurch gekennzeichnet, dass die keramischen Auskleidungselemente (2) feuerfeste Ziegel sind.
Verfahren nach Anspruch 1 oder 2,

dadurch gekennzeichnet, dass das Lötmittel separat an den Verbindungsbereich gebracht wird, beispielsweise in der Form von Puder oder einer Folie.
Verfahren nach einem der Ansprüche 1-3,

dadurch gekennzeichnet, dass das Lötmittel an den Verbindungsbereich zusammen mit den zusammenzufügenden Stücken gebracht wird.
Verfahren nach einem der Ansprüche 1-4,

dadurch gekennzeichnet, dass an den keramischen Auskleidungselementen (2), zumindest an der Verbindungsoberfläche davon, mindestens eine Mittelschicht dazwischen vorgesehen ist, wie beispielsweise eine Metallschicht oder eine Lötmittelschicht, bevor die Elemente an den Verbindungsbereich gebracht werden.
Kühlelement, aufweisend ein Gehäuseteil (1), der mit einem Kanalsystem für die Kühlwasserzirkulation versehen ist, eine aus keramischen Elementen (2) gefertigte Auskleidung an zumindest einem Teil der Gehäuseteil-Oberfläche,

dadurch gekennzeichnet, dass die keramischen Auskleidungs-Elemente (2) mit Hilfe eines Lötmittels mit dem hauptsächlich aus Kupfer gefertigten Gehäuseteil (1) verbunden sind, derart, dass daraus ein guter thermischer Kontakt zwischen dem keramischen Element und dem Gehäuseteil resultiert, und die Oberfläche des Kühlelement-Gehäuseteils (1) mit Nuten (3) versehen ist, in denen die keramischen Auskleidungselemente (2) eingepasst sind.
Kühlelement nach Anspruch 6,

dadurch gekennzeichnet, dass die keramischen Auskleidungselemente (2) in den Nuten (3) durch eine formschließende Weise fest gehalten sind, wenn das Element in einer Position ist, bei der sich die Nut nach unten öffnet.
Kühlelement nach einem der Ansprüche 6 oder 7,

dadurch gekennzeichnet, dass der Abstand (W1, W2) zwischen den gegenüberliegenden Wänden der Gehäuseteil-Nuten (3) reduziert ist, wenn man sich vom Boden der Nuten in Richtung zur Oberfläche des Gehäuseteils bewegt.
Anspruch[en]
A method for manufacturing a cooling element comprising a housing part and ceramic lining elements arranged on the housing part surface, characterized in that the ceramic lining elements (2) are connected to the element housing part (1), mainly made of copper, by using in the joint between the lining elements and the housing part a soldering agent, wherein at least the junction area is heated at least up to the melting temperature of the soldering agent, so that there is created a joint with a good thermal contact with the element housing part (1) and a ceramic lining element (2) and the surface of the cooling element housing part (1) is provided with grooves (3), in which the ceramic lining elements (2) are fitted. A method according to claim 1, characterized in that the ceramic lining elements (2) are fireproof bricks. A method according to claims 1 or 2, characterized in that the soldering agent is brought separately to the junction area, for example as a powder or a foil. A method according to any of the claims 1 - 3, characterized in that the soldering agent is brought to the junction area together with the pieces to be joined together. A method according to any of the claims 1 - 4, characterized in that in the ceramic lining elements (2), at least on the junction surface thereof, there is applied at least one intermediate agent layer, such as a metal layer or a soldering agent layer, prior to bringing the elements to the junction area. A cooling element comprising a housing part (1) provided with a channel system for the cooling water circulation, and a lining made of ceramic elements (2) in at least part of the housing part surface, characterized in that the ceramic lining elements (2) are connected to the housing part (1), mainly made of copper, by means of a soldering agent in a way that results in a good thermal contact between the ceramic element and the housing part and the surface of the cooling element housing part (1) is provided with grooves (3), in which the ceramic lining elements (2) are arranged to be fitted. A cooling element according to claim 6, characterized in that the ceramic lining elements (2) are arranged to be kept in the grooves (3) in a shape-locked fashion, when the element is in a position where the groove opens downwardly. A cooling element according to claims 6 or 7, characterized in that the distance (W1, W2) between the opposite walls of the housing part grooves (3) is reduced while proceeding from the bottom of the grooves towards the housing part surface.
Anspruch[fr]
Procédé de fabrication d'un élément réfrigérant comprenant un boîtier et des éléments de garniture en céramique disposés sur la surface du boîtier,

caractérisé par le fait que les éléments de garniture en céramique (2) sont reliés au boîtier de l'élément (1), principalement constitué de cuivre, en utilisant dans le joint entre les éléments de garniture et le boîtier un agent de brasage, au moins la zone de jonction étant chauffée au moins jusqu'à la température de fusion de l'agent de brasage, de telle sorte qu'un joint est créé formant un bon contact thermique avec le boîtier de l'élément (1) et un élément de garniture en céramique (2), et que la surface du boîtier de l'élément réfrigérant (1) est munie de gorges (3), dans lesquelles sont fixés les éléments de garniture en céramique (2).
Procédé selon la revendication 1,

caractérisé par le fait que les éléments de garniture en céramique (2) sont des briques ignifuges.
Procédé selon la revendication 1 ou 2,

caractérisé par le fait que l'agent de brasage est amené séparément dans la zone de jonction, par exemple sous forme de poudre ou de feuille.
Procédé selon l'une quelconque des revendications 1 à 3,

caractérisé par le fait que l'agent de brasage est amené à la zone de jonction conjointement avec les pièces devant être assemblées.
Procédé selon l'une quelconque des revendications 1 à 4,

caractérisé par le fait que dans les éléments de garniture en céramique (2), au moins sur la surface de jonction de ceux-ci, au moins une couche intermédiaire d'agent est appliquée, comme une couche de métal ou une couche d'agent de brasage, avant d'amener les éléments à la zone de jonction.
Elément réfrigérant comprenant un boîtier (1) muni d'un système de canaux destinés à la circulation de l'eau de réfrigération, et une garniture composée d'éléments céramiques (2) dans au moins une partie de la surface du boîtier,

caractérisé par le fait que les éléments de garniture de céramique (2) sont connectés au boîtier (1), constitué principalement de cuivre, par l'intermédiaire d'un agent de brasage d'une manière résultant en un bon contact thermique entre l'élément céramique et le boîtier, et la surface du boîtier de l'élément réfrigérant (1) est muni de gorges (3), dans lesquelles sont disposés les éléments de garniture céramique (2) afin d'être fixés.
Elément réfrigérant selon la revendication 6,

caractérisé par le fait que les éléments de garniture en céramique (2) sont disposés pour être retenus dans les gorges (3) par emboîtement par fermeture géométrique quand l'élément est dans une position telle que la gorge s'ouvre vers le bas.
Elément réfrigérant selon les revendications 6 ou 7,

caractérisé par le fait que la distance (W1, W2) entre les parois opposées des gorges du boîtier (3) se réduit en allant du fond des gorges vers la surface du boîtier.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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