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Dokumentenidentifikation EP1337800 21.06.2007
EP-Veröffentlichungsnummer 0001337800
Titel KÜHLELEMENT
Anmelder Outokumpu Oyj, Espoo, FI
Erfinder SAARINEN, Risto, FIN-02200 Espoo, FI
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60128386
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 26.10.2001
EP-Aktenzeichen 019805621
WO-Anmeldetag 26.10.2001
PCT-Aktenzeichen PCT/FI01/00923
WO-Veröffentlichungsnummer 2002037044
WO-Veröffentlichungsdatum 10.05.2002
EP-Offenlegungsdatum 27.08.2003
EP date of grant 09.05.2007
Veröffentlichungstag im Patentblatt 21.06.2007
IPC-Hauptklasse F27D 1/12(2006.01)A, F, I, 20051017, B, H, EP

Beschreibung[en]

The present invention relates to a furnace according to the preamble of claim 1.

In connection with furnaces used for industrial purposes, particularly in the manufacturing of metals, such as flash smelting furnaces, blast furnaces and electric furnaces or other metallurgic reactors, there are used cooling elements that are typically made of mainly copper. Typically these cooling elements are cooled by water and thus provided with a cooling water channel system, in which case the heat is transferred from the fire-resistant bricks in the furnace space, via the housing of the cooling element, to the cooling water. The working conditions are extreme, and the cooling elements are subjected, among others,. to strong corrosion and erosion strains caused by the furnace atmosphere or molten contacts. For instance a brickwork, constituting the lining on the walls of the settler in a flash converting furnace, is protected by cooling elements, the task of which is to keep the temperature of the brickwork so low that the wearing of the bricks for reasons mentioned above is slow. However, the brickwork gets thinner in the course of time, and there may arise a situation where the molten metal gets into contact with the cooling element made of copper. Typically, in a direct molten contact, a cooling element made of copper does not endure the effect of the molten metal, particularly if the molten metal is flowing or turbulent, but it starts to melt, and this results in overloading the cooling power of the element and in subsequent damages. This may even lead to remarkable economic losses.

The object of the present invention is to realize furnace including a cooling element whereby the drawbacks of the prior art can be avoided.

The invention is characterized by what is set forth in the appended claims.

Document WO 01/63192 A1 as an Art. 54 (3) EPC-document discloses a cooling element for furnaces comprising a housing mainly made of copper, and a channel system provided in the housing for a cooling medium circulation. At least, partly on the surface of the element housing there is arranged a steel surface that has a better corrosion resistance. Document WO 00/50831 in turn discloses a cooler used for cooling a furnace wall of a metallurgical furnace being made of modular graphite cast iron. The cooler is fixed to the interior surface of a furnace shell, wherein refractory bricks are replaced by resistant steel plates. Further, said stainless steel blocks could encompass dovetail grooves cut on the furnace interior side of the stave cooler to be fixed thereto. Document WO 00/46561 deals with a water cooling panel for a furnace wall made of cast steel or copper having further refractory bricks arranged in the cooling element.

The arrangement according to the invention has several outstanding advantages.

By means of the invention, there are realized cooling elements with a remarkably improved resistance, particularly in applications where a contact between the cooling element and the molten metal is probable. The housing of the cooling element is made of copper, which has good thermal conductivity, in which case steel elements are arranged on the element surface. By arranging the steel elements at fastening points, such as grooves, provided in the housing of the cooling element, there is obtained an extremely functional and effective fastening arrangement of the steel plates. When the steel surface is made of several separate elements, there is achieved an extremely functional arrangement with respect to both the manufacturing technique and to maintenance. As a whole, the invention improves productivity and safety.

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

  • Figure 1 illustrates a cross-section of a cooling element according to the invention,
  • Figure 2 illustrates a cross-section of the wall of a typical flash converting furnace, where a cooling element according to the invention is utilized,
  • Figure 3 illustrates a cross-section of the housing of the cooling element according to figure 1,
  • Figure 4 illustrates a cross-section of one structural part according to a the invention,
  • Figure 5 illustrates a cross-section of another structural part according to the invention, and
  • Figure 6 illustrates a cooling element according to the invention.

The cooling element according to the invention, particularly designed to be used in metal processes, in connection with furnaces, comprises a housing 1 provided with a channel system 2 for the cooling water circulation: According to the invention, at least part of the cooling element surface, which may get into contact with the molten metal, is steel. The housing part of the cooling element is made of copper, in which case at least one steel element is arranged on the housing surface.

The cooling element according to the drawings comprises a housing 1, provided with a channel system 2 (figure 3) for cooling water circulation. Typically the housing 1 of the cooling element is made of copper. Advantageously the housing 1 of the cooling element is made for instance by casting, such as draw casting. In the housing 1, there is arranged a channel system 2 for the cooling agent circulation. Typically the channel system 2 is made by working, for instance by drilling, or in connection with casting. On that side 4 of the surface of the housing 1 that is placed in the furnace space, or at least on a part of said surface, there are typically made grooves 3, in which there can be placed parts of the ceramic lining of the furnace space, typically fireproof bricks. At least part of the element surface 4 on the side of the furnace space is provided with structural parts 5, 6, which are made of steel and are typically high-alloy steel elements. The steel elements 5, 6 are attached to the housing 1 of the cooling element, so that the heat contact between the housing and the steel plates is good, in which case the cooling effect of the cooling agent flowing in the cooling channel system 2 of the element prevents the molten metal, for example copper, from penetrating into the steel of the structural parts 5, 6. In the example according to the figures, on the element surface there are made grooves 7, 8, 9, advantageously horizontal grooves, in which the counterpart 10, 11 of the steel element is arranged to fit in (figures 4 and 5). Typically the steel element serving as the structural part 5, 6 is arranged to remain advantageously based on the shapes therebetween in the grooves 7, 8, 9 of the housing. The grooves 7, 8, 9 can be designed to be for example narrowing from the groove bottom towards the element surface, in which case the width on the groove bottom is larger than the width on the surface level. In a typical embodiment, the groove width on the housing surface level is 2 - 10 mm narrower than the groove width on the groove bottom. The measure tolerance between the grooves and the steel plates is arranged to be such that the steel plates can be inserted in the grooves at the end thereof, from the side of the element housing.

The steel elements 5, 6 can be simply inserted in the grooves reserved for them, or they can be attached to the housing by another suitable fashion. In a preferred embodiment, the steel elements are attached to the housing by a diffusion joint.

Typically the cooling elements are placed in the furnace walls so that at least the area that possibly gets into contact with molten metal is provided with a steel surface, typically particularly with steel elements 5, 6. According to figure 2, the cooling element is arranged in the area of the junction 16 between the lining 14, 15 of the bottom 12 and the sidewall 13 of the furnace. In figure 2, the furnace space 17 is located on the left-hand side with respect to the cooling element. Typically the area of the cooling element that is provided with a steel surface is in a flash converter furnace located in the border surface area between blister copper and slag. The shape and measures of the cooling element depend on the measure dimensions and type of the furnace.

The cooling element according to the drawings comprises an essentially straight wall directed away from the furnace space, in which wall the connections 18, 19 of the cooling channel system 2 are arranged. On the side 4 facing the furnace space 17, the bottom part of the cooling element narrows in a wedge-like fashion towards the bottom edge, in which case the element matches better the brickwork 14 of the curved bottom part 12 of the furnace. In the upper part of the element, there are made grooves for the fireproof lining 15 of the furnace wall. Now the steel surface of the cooling element is placed in the middle part of the element in the height direction thereof, when the element is installed in place in the furnace wall.

The cooling elements according to the invention can be used in several different targets. A typical target of usage for the cooling element according to the invention is for instance the sidewalls of the furnace space of the settler in a flash converter furnace. Typical measures for the cooling element according to the invention are: width 0.25-1 m, length 1 - 2 m, thickness of the housing 100 - 200 mm, of which the thickness of the grooved part constitutes about half. Naturally the cooling element can also serve as the cooling element in some other furnace used particularly in metal production of refining processes. The shape and size of the cooling element are dependent on the target of usage in question.

In a preferred embodiment, the steel surface of the cooling element according to the invention is made of heat resistive, high-alloy steel with high chromium content, typically of the order 20-30%, advantageously 24-28 %. The suitability of the material in a particular target of usage according to the invention also is defined by the rest of the alloy ingredients of steel. A commercial steel type suited to be used in connection with the invention is for example GX40CrNiSi27-4. In that case the employed steel is heat resistant, high-alloy cast steel.


Anspruch[de]
Ein auf Metallproduktionsprozesse bezogener Ofen, aufweisend ein Kühlelement, wobei das Kühlelement ein Gehäuse (1) aus Kupfer aufweist, das mit einem Kanalsystem (2) für eine Kühlwasserzirkulation versehen ist, wobei an dem Gehäuse (1) an der dem Ofenraum zugewandten Seite Stahlelemente (5, 6) festgelegt sind, die jeweils in einer Nut des Gehäuses (1) angeordnet sind, so dass sie mit geschmolzenem Metall in Kontakt treten können,

dadurch gekennzeichnet, dass das Kühlelement zwischen einer feuerfesten Auskleidung (15) einer Ofenwand und einer Seitenwand (13) des Ofens in dem Verbindungsbereich (16) zwischen der Auskleidung (14, 15) des Bodens (12) und der Seitenwand (13) des Ofens eingepasst ist.
Ofen nach Anspruch 1, dadurch gekennzeichnet, dass zumindest ein Stahlelement (5, 6) in dem Bereich des Kühlelements (1) angeordnet ist, der mit geschmolzenem Metall in Kontakt geraten kann. Ofen nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass das Kühlelement mit Befestigungsflächen (3), wie beispielsweise Nuten, für eine keramische Auskleidung versehen ist, z.B. für eine Ziegelauskleidung. Ofen nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, dass das Stahlelement (5, 6) ein Gegenstück (10, 11) aufweist, das komplementär zu einem in dem Kühlelementgehäuse (1) angeordneten Befestigungspunkt (7, 8, 9), beispielsweise eine Nut, passt. Ofen nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, dass die Stahlelemente mittels einer Diffusionsverbindung an dem Kühlgehäuse (1) festgelegt sind. Ofen nach einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass der eingesetzte Stahl ein hitzefester hochlegierter Gussstahl ist. Ofen nach einem der Ansprüche 1-6, dadurch gekennzeichnet, dass der Chromgehalt des Stahls im Bereich von 20 - 30 %, vorteilhaft 24 - 28 % liegt.
Anspruch[en]
A furnace related to metal production processes comprising a cooling element, said element comprising a housing (1) made of copper, provided with a channel system (2) for cooling water circulation, wherein at the housing (1) faced to the side to the furnace space there are attached steel elements (5, 6) each arranged in a groove of the housing (1) so that they may get into contact with molten metal,

characterized in that the cooling element is fitted between a fireproof lining (15) of a furnace wall and a sidewall (13) of the furnace in the area of the junction (16) between the lining (14, 15) of the bottom (12) and the sidewall (13) of the furnace.
A furnace according to claim 1, characterized in that at least one steel element (5, 6) is arranged in that area of the cooling element (1) that may get into contact with molten metal. A furnace according to any of the claims 1 - 2, characterized in that the cooling element is provided with fastening surfaces (3), such as grooves, for a ceramic lining, for instance brick lining. A furnace according to any of the claims 1 - 3, characterized in that the steel element (5, 6) has a counterpart (10, 11) which is arranged to match the fastening point (7, 8, 9), such as a groove, arranged in the cooling element housing (1). A furnace according to any of the claims 1 - 4, characterized in that the steel elements are attached to the cooling housing (1) by means of a diffusion joint. A furnace according to any of the claims 1 - 5, characterized in that the employed steel is heat resistive, high-alloy cast steel. A furnace according to any of the claims 1 - 6, characterized in that the chromium content of the steel is of the order 20-30%, advantageously 24-28%.
Anspruch[fr]
Four associé à des processus de production de métal comportant un élément de refroidissement, ledit élément comportant un boîtier (1) réalisé en cuivre, muni d'un système de canalisation (2) destiné à la circulation de l'eau de refroidissement, dans lequel des éléments en acier (5, 6) disposés chacun dans une gorge du boîtier (1) sont reliés au niveau du boîtier (1) orienté latéralement à l'espace du four de telle sorte qu'ils peuvent entrer en contact avec le métal en fusion,

caractérisé par le fait que l'élément de refroidissement est monté entre un revêtement ignifuge (15) d'une paroi du four et une paroi latérale (13) du four dans la zone de jonction (16) entre le revêtement (14, 15) de la base (12) et la paroi latérale (13) du four.
Four selon la revendication 1,

caractérisé par le fait qu'au moins un élément en acier (5, 6) est disposé dans cette zone de l'élément de refroidissement (1) pouvant entrer en contact avec le métal en fusion.
Four selon l'une quelconque des revendications 1 à 2,

caractérisé par le fait que l'élément de refroidissement est muni de surfaces de fixation (3), comme des gorges, pour un revêtement en céramique, par exemple un revêtement en briques.
Four selon l'une quelconque des revendications 1 à 3,

caractérisé par le fait que l'élément en acier (5, 6) possède une contre-pièce (10, 11) disposée de telle sorte qu'elle s'adapte au point de fixation (7, 8, 9), comme une gorge, disposé dans le boîtier de l'élément de refroidissement (1).
Four selon l'une quelconque des revendications 1 à 4,

caractérisé par le fait que les éléments en acier sont reliés au boîtier de refroidissement (1) au moyen d'un joint de diffusion.
Four selon l'une quelconque des revendications 1 à 5,

caractérisé par le fait que l'acier utilisé est de l'acier coulé fortement allié thermorésistant.
Four selon l'une quelconque des revendications 1 à 6,

caractérisé par le fait que la teneur en chrome de l'acier est de l'ordre de 20 à 30 %, avantageusement de 24 à 28 %.






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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