EP2825677A1 - Cooling element for a melting furnace - Google Patents

Cooling element for a melting furnace

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Publication number
EP2825677A1
EP2825677A1 EP13714540.5A EP13714540A EP2825677A1 EP 2825677 A1 EP2825677 A1 EP 2825677A1 EP 13714540 A EP13714540 A EP 13714540A EP 2825677 A1 EP2825677 A1 EP 2825677A1
Authority
EP
European Patent Office
Prior art keywords
cooling
bead
cooling element
cover plate
element according
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
EP13714540.5A
Other languages
German (de)
French (fr)
Other versions
EP2825677B1 (en
Inventor
Christian Neyer
Frank Böert
Christof Dratner
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.)
KME Special Products GmbH and Co KG
Original Assignee
KME Germany GmbH
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 KME Germany GmbH filed Critical KME Germany GmbH
Publication of EP2825677A1 publication Critical patent/EP2825677A1/en
Application granted granted Critical
Publication of EP2825677B1 publication Critical patent/EP2825677B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/0056—Use of high thermoconductive elements
    • F27D2009/0062—Use of high thermoconductive elements made from copper or copper alloy

Definitions

  • the invention relates to a cooling element for a melting furnace, in particular an electric arc furnace having the features of patent claim 1.
  • DE 44 46 542 A1 describes a furnace vessel for a DC arc furnace with a heat-resistant wall, which consists in the area above the slag line range of a plurality of water-cooled wall segments made of steel. These wall segments are attached to a support structure. At least one of the wall segments consists of non-magnetic steel or copper and is preferably arranged on the side of the furnace vessel opposite the power supply device.
  • the individual wall segments comprise horizontally extending tubes made of non-magnetic steel, which are not arranged close to each other, but spaced apart in the vertical direction and by means of metal strips of the same material as the tubes connected to each other, for example, welded. The remaining spaces between the tubes are filled with refractory before or after installation of the wall segment.
  • cooling tube coils may be provided on the side facing the furnace center with projections, preferably nubs, pins, ribs or the like, in order to promote the adhesion of refractory material.
  • cooling panels made of steel and / or copper pipes.
  • the booth also includes cooling panels with copper pipes with so-called fin profiles.
  • This is a profile shape in which the finned webs (fins) are formed on the copper pipes, which allow better adhesion of the refractory lining.
  • additional anchors are superfluous, which are partly additionally used in surface smooth, circular tubes.
  • these tube constructions are provided with a steel back plate. Usually, this is welded to a pipe construction. The welding can also be done indirectly by welding special receptacles to the cooling tubes, which in turn are bolted or welded to the steel plate.
  • the present invention seeks to provide a cooling element for a melting furnace with a cost-effective connection between the at least one cooling tube and a cover plate connected to the cooling tube.
  • the cooling element according to the invention for a melting furnace provides in a known manner a cover plate, which may also be referred to as a support plate or base plate. As a rule, it is made of steel. At least one cooling tube is attached to this cover plate. Under a cooling tube may be a cooling tube to be understood, which runs in Meanderform. Thus, essentially the entire cover sheet can be covered, although it has larger dimensions than the cooling pipe.
  • the at least one cooling tube has a bead on its side facing the cover plate, via which it is connected to the cover plate.
  • the bead on the cooling tube increases the distance between the cover plate and the tubular part of the cooling tube. This spacing brings with it considerable advantages, both in terms of the possibilities of attachment and the security of the attachment.
  • Manufacturing technology the bead advantageously forms a uniform unit of material with the cooling tube. Preferably, therefore, it is a bead, which is formed in the extrusion process.
  • the bead therefore preferably extends in the longitudinal direction of the cooling tube.
  • the bead can therefore preferably without a further post-processing have constant width. Additional joining techniques for attaching the bead on the cooling tube omitted.
  • the bead has the particular advantage that a screw connection between the cooling tube and the cover plate can be realized, without causing the wall thickness of the cooling tube is weakened. It is understood that the bead for a screw must have a sufficient sizing. In particular, the bead must be so large that in relation to the cooling tube radially oriented threaded receptacle can be formed in it. Since such a threaded receptacle should not weaken the geometry of the tube, the depth of the threaded receptacle is preferably smaller than the height of the bead measured in the region of the central longitudinal axis of the threaded receptacle.
  • the bead must be wide enough to be sufficiently resistant to forces transmitted to the bead via a threaded connection.
  • the width of the bead should therefore be in a ratio of 1, 5 to 2.5 to the diameter of the threaded receptacle.
  • cooling tubes preferably consist of copper or a copper material which has a lower strength than the cover plate, which preferably consists of steel, it is provided in an advantageous development that threaded sleeves are inserted into the threaded bores.
  • the threaded sleeves can transmit higher forces compared to the actual screw due to their larger diameter.
  • the screw can be done either by screws, which are screwed after the positioning of the tube to the cooling plate from the furnace outer side through the cover plate into the threaded holes in which threaded sleeves are optionally arranged.
  • stud bolts can be attached to the bead, these studs are passed through openings in cover plates and fixed there by nuts.
  • a cohesive connection by means of such a bead has the advantage that greater security against leaks in comparison to an immediate welding of the pipe wall with the steel plate.
  • the heat-affected zone during welding is located by the bead at a greater distance from the coolant-conducting part of the cooling tube. Thermally induced microstructural changes do not affect the strength or even the tightness of the coolant-conducting part of the cooling tube.
  • the weld may be made more durable on a flat surface of the bead, as opposed to the curved surface of a pipe.
  • the cooling tube has on its side remote from the bead at least one extending in the longitudinal direction of the cooling tube web, a so-called fin.
  • a so-called fin Preferably, two webs are provided which are mutually arranged at an angle of 30 to 90 °. Preferably, the angle is 60 °.
  • Refractory material can adhere better and more permanently over these webs.
  • the webs in combination with the bead arranged on the opposite side also have the advantage that the material used during the extrusion is distributed more uniformly over the circumference of the entire cooling tube. This is production technology advantageous.
  • the cooling elements according to the invention are preferably used above the slag level in the wall region of a furnace vessel of an electric arc furnace.
  • the cooling elements according to the invention can also be arranged in the region of the lid and an exhaust pipe of the furnace vessel.
  • Figure 1 is a perspective view of a cooling element (detail);
  • FIG 2 is an enlarged view of the cooling element of Figure 1 and
  • FIG 3 shows a sectional view through a cooling tube on a cover plate.
  • FIG. 1 shows a perspective view of a small portion of a cooling element of a melting furnace, not shown, in particular an electric arc furnace.
  • a cover plate 2 and a below the cover plate arranged cooling tube 3 is shown.
  • the cover plate 2 is substantially larger and forms a wall segment of a furnace vessel. This wall segment is located in the installed position above the melting mirror.
  • the cooling tubes 3 face the furnace inside the melting furnace. They are flowed through in a manner not shown by a coolant. In addition, they are also surrounded in a manner not shown by a refractory material to protect them from the prevailing in the electric arc furnace temperature.
  • the special feature of the cooling element according to the invention is the nature of the design of the cooling tube 3 in connection with the attachment.
  • FIG. 2 shows that the cooling tube 3 is circular, but in its upper in the image plane, d. H. the cover plate 2 side facing a continuous, extending in the longitudinal direction of the cooling tube 3 bead 4 has.
  • a plurality of threaded receptacles are formed, which are also spaced apart in the longitudinal direction of the cooling tube 3 to each other.
  • a threaded sleeve 6 is inserted, in turn, a screw 7 engages, which are formed through through holes in the cover plate 2.
  • the screws 7 are countersunk screws which do not protrude beyond the outside or surface of the cover plate 2 in the installed position.
  • two webs 8, 9 are arranged on the side of the cooling tube 3 facing away from the cover plate 2. The webs 8, 9 are used for improved connection of a refractory material not shown with the cooling pipe. 3
  • FIG. 3 shows that the webs 8, 9 are at an angle W of 60 ° to one another and have approximately the same wall thickness as the tubular section of the cooling tube 3.
  • the threaded receptacle 5 in the bead 4 has a depth T which is less than or equal to the height H1 of the bead.
  • the depth T of the threaded receptacle 5 is 18 mm at a corresponding height H1 of the bead 4.
  • the threaded receptacle 5 has a diameter of 20 mm for receiving a threaded sleeve M20 x 1, 5 with an internal thread M16 x 2.
  • a width B of the bead 4 of 40 mm results on both sides of the threaded receptacle 5 a remaining wall thickness of 10 mm.
  • the tubular portion of the cooling tube has a wall thickness of 12 mm.
  • the outer diameter is 89.8 mm.
  • the two webs 8, 9 are radially from the tubular portion of the cooling tube 3 from. The webs 8, 9 are about twice as high as they are wide.
  • the cover plate 2 has a thickness of preferably also 12 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

The invention relates to a cooling element for a melting furnace having a cover plate (2) and at least one cooling pipe (3) fastened to the cover plate (2), wherein the at least one cooling pipe (3) comprises a bead (4) on the face thereof that faces the cover plate (2), via which bead said pipe is connected to the cover plate (2).

Description

Kühlelement für einen Schmelzofen  Cooling element for a melting furnace
Die Erfindung betrifft ein Kühlelement für einen Schmelzofen, insbesondere einen Lichtbogenofen mit den Merkmalen des Patentanspruchs 1. The invention relates to a cooling element for a melting furnace, in particular an electric arc furnace having the features of patent claim 1.
Die DE 44 46 542 A1 beschreibt ein Ofengefäß für einen Gleichstrom- Lichtbogenofen mit einer wärmebeständigen Wandung, die im oberhalb der Schlackenlinie liegenden Bereich aus einer Mehrzahl wassergekühlter Wandsegmente aus Stahl besteht. Diese Wandsegmente sind an einer Tragkonstruktion befestigt. Mindestens eines der Wandsegmente besteht aus unmagnetischem Stahl oder Kupfer und ist vorzugsweise auf der der Stromversorgungseinrichtung gegenüber liegenden Seite des Ofengefäßes angeordnet. Die einzelnen Wandsegmente umfassen in Horizontalrichtung verlaufende Rohre aus nicht magnetischem Stahl, die nicht dicht an dicht angeordnet sind, sondern in Vertikalrichtung voneinander beabstandet und mittels Metallstreifen aus dem gleichen Material wie die Rohre untereinander verbunden, zum Beispiel verschweißt, sind. Die verbleibenden Zwischenräume zwischen den Rohren werden vor oder nach dem Einbau des Wandsegments mit Feuerfestmaterial ausgefüllt. DE 44 46 542 A1 describes a furnace vessel for a DC arc furnace with a heat-resistant wall, which consists in the area above the slag line range of a plurality of water-cooled wall segments made of steel. These wall segments are attached to a support structure. At least one of the wall segments consists of non-magnetic steel or copper and is preferably arranged on the side of the furnace vessel opposite the power supply device. The individual wall segments comprise horizontally extending tubes made of non-magnetic steel, which are not arranged close to each other, but spaced apart in the vertical direction and by means of metal strips of the same material as the tubes connected to each other, for example, welded. The remaining spaces between the tubes are filled with refractory before or after installation of the wall segment.
In der DE 27 456 22 A1 wird vorgeschlagen, die Kühlrohre für einen Lichtbogenofen dicht an dicht zu platzieren und schweißtechnisch zu verbinden. Die so genannten Kühlrohrschlangen können an der der Ofenmitte zugewandten Seite mit Vorsprüngen, vorzugsweise Noppen, Stiften, Rippen oder dergleichen, versehen sein, um das Anhaften von Feuerfestmaterial zu begünstigen. In DE 27 456 22 A1 it is proposed to place the cooling tubes for an electric arc furnace close together and to connect welding technology. The so-called cooling tube coils may be provided on the side facing the furnace center with projections, preferably nubs, pins, ribs or the like, in order to promote the adhesion of refractory material.
BESTÄTIGUNGSKOPIE In der GB 898 532 wird vorgeschlagen, U-förmige Spannbügel auf die Kühlrohre zu schweißen, wobei die Fixierung der Rohrkonstruktion an einer Halterung über Keile erfolgt, die zwischen einem Widerlager und dem Steg der Spannbügel eingetrieben werden. Die Kühlrohre sind auf der dem Ofeninneren zugewandten Seite mit einzelnen Vorsprüngen versehen. CONFIRMATION COPY In GB 898 532 it is proposed to weld U-shaped clamping brackets to the cooling pipes, wherein the fixing of the pipe construction to a holder takes place via wedges which are driven in between an abutment and the web of the clamping yokes. The cooling tubes are provided on the furnace inside facing side with individual projections.
Nach heutigem Stand der Technik gibt es mithin Kühlpaneele aus Stahl- und/oder Kupferrohren. Zum Stand zählen auch Kühlpaneele mit Kupferrohren mit so genannten Flossenprofilen. Hierbei handelt es sich um eine Profilform, bei welcher zum Ofeninneren weisenden Stege (Flossen) an den Kupferrohren ausgebildet sind, die eine bessere Haftung der Feuerfestauskleidung ermöglichen. Hierdurch werden zusätzliche Anker überflüssig, die bei oberflächig glatten, kreisrunden Rohren teilweise zusätzlich eingesetzt werden. According to the current state of the art, there are therefore cooling panels made of steel and / or copper pipes. The booth also includes cooling panels with copper pipes with so-called fin profiles. This is a profile shape in which the finned webs (fins) are formed on the copper pipes, which allow better adhesion of the refractory lining. As a result, additional anchors are superfluous, which are partly additionally used in surface smooth, circular tubes.
Um ein geschlossenes Gefäß zu erhalten, werden diese Rohrkonstruktionen mit einer Rückenplatte aus Stahl versehen. Üblicherweise wird diese mit einer Rohrkonstruktion verschweißt. Das Verschweißen kann auch mittelbar erfolgen, indem an die Kühlrohre spezielle Aufnahmen geschweißt werden, die dann wiederum mit der Stahlplatte verschraubt oder verschweißt werden. To obtain a closed vessel, these tube constructions are provided with a steel back plate. Usually, this is welded to a pipe construction. The welding can also be done indirectly by welding special receptacles to the cooling tubes, which in turn are bolted or welded to the steel plate.
Bei den bekannten Schweißkonstruktionen hat sich herausgestellt, dass der Aufwand zur Befestigung der Rohrkonstruktion an der Stahlplatte unverhältnismäßig hoch ist. Insbesondere schweißtechnische Verbindungen zwischen den Rohren und der Stahlplatte sind für Reparaturarbeiten von Nachteil. Ein weiterer Nachteil einer verschweißten Konstruktion mit einer Stahlplatte ist, dass beim Schweißen Undichtigkeiten im Rohr auftreten können. Auch kann es durch die Temperaturen beim Schweißen zu einem Verzug des Kühlpanels kommen. Die thermischen Wechselbeanspruchungen während des Ofenbetriebs können dazu führen, dass sich die Stahlplatte bzw. das gesamte Kühlpaneel verzieht und dabei Schweißnähte von der tragenden Grundplatte aus Stahl abgerissen werden. Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein Kühlelement für einen Schmelzofen aufzuzeigen mit einer kostengünstigen Verbindung zwischen dem mindestens einen Kühlrohr und einem mit dem Kühlrohr verbundenen Deckblech. In the known welded constructions, it has been found that the expense of attaching the pipe construction to the steel plate is disproportionately high. In particular, welding connections between the pipes and the steel plate are for repair of disadvantage. Another disadvantage of a welded construction with a steel plate is that leaks in the pipe can occur during welding. Also, it can come by the temperatures during welding to a delay of the cooling panel. The thermal cycling during furnace operation can cause the steel plate or the entire cooling panel to warp, breaking welds from the steel base plate. Proceeding from this, the present invention seeks to provide a cooling element for a melting furnace with a cost-effective connection between the at least one cooling tube and a cover plate connected to the cooling tube.
Diese Aufgabe ist bei einem Kühlelement mit den Merkmalen des Patentanspruchs 1 gelöst. This object is achieved with a cooling element having the features of patent claim 1.
Vorteilhafte Weiterbildungen des Erfindungsgedankens sind Gegenstand der Unteransprüche. Advantageous developments of the inventive concept are the subject of the dependent claims.
Das erfindungsgemäße Kühlelement für einen Schmelzofen, insbesondere einen Lichtbogenofen sieht in bekannter Weise ein Deckblech vor, das auch als Tragplatte oder Grundplatte bezeichnet werden kann. In der Regel besteht es aus Stahl. An diesem Deckblech ist wenigstens ein Kühlrohr befestigt. Unter einem Kühlrohr kann eine Kühlrohrschlange zu verstehen sein, die in Meanderform verläuft. So kann im Wesentlichen das gesamte Deckblech bedeckt werden, obwohl es größere Abmessungen besitzt als das Kühlrohr. The cooling element according to the invention for a melting furnace, in particular an electric arc furnace, provides in a known manner a cover plate, which may also be referred to as a support plate or base plate. As a rule, it is made of steel. At least one cooling tube is attached to this cover plate. Under a cooling tube may be a cooling tube to be understood, which runs in Meanderform. Thus, essentially the entire cover sheet can be covered, although it has larger dimensions than the cooling pipe.
Erfindungsgemäß ist vorgesehen, dass das wenigstens eine Kühlrohr auf seiner dem Deckblech zugewandten Seite einen Wulst aufweist, über welchen es mit dem Deckblech verbunden ist. Der Wulst am Kühlrohr erhöht den Abstand zwischen dem Deckblech und dem rohrförmigen Teil des Kühlrohrs. Diese Beabstandung bringt erhebliche Vorteile mit sich, sowohl was die Möglichkeiten der Befestigung als auch die Sicherheit der Befestigung angeht. Herstellungstechnisch bildet der Wulst vorteilhaft eine materialeinheitlich einstückige Einheit mit dem Kühlrohr. Vorzugsweise handelt es sich daher um einen Wulst, der im Strangpressverfahren angeformt ist. Bevorzugt erstreckt sich der Wulst daher in Längsrichtung des Kühlrohrs. Der Wulst kann ohne weitere Nachbearbeitung daher vorzugsweise eine konstante Breite aufweisen. Zusätzliche Fügetechniken zum Anbringen des Wulstes an dem Kühlrohr entfallen. According to the invention, it is provided that the at least one cooling tube has a bead on its side facing the cover plate, via which it is connected to the cover plate. The bead on the cooling tube increases the distance between the cover plate and the tubular part of the cooling tube. This spacing brings with it considerable advantages, both in terms of the possibilities of attachment and the security of the attachment. Manufacturing technology, the bead advantageously forms a uniform unit of material with the cooling tube. Preferably, therefore, it is a bead, which is formed in the extrusion process. The bead therefore preferably extends in the longitudinal direction of the cooling tube. The bead can therefore preferably without a further post-processing have constant width. Additional joining techniques for attaching the bead on the cooling tube omitted.
Der Wulst hat insbesondere den Vorteil, dass eine Schraubverbindung zwischen dem Kühlrohr und dem Deckblech realisiert werden kann, ohne dass dabei die Wanddicke des Kühlrohrs geschwächt wird. Es versteht sich, dass der Wulst für eine Schraubverbindung eine hinreichende Dimensionierung aufweisen muss. Insbesondere muss der Wulst so groß sein, dass in ihm eine bezogen auf das Kühlrohr radial orientierte Gewindeaufnahme ausgebildet werden kann. Da eine solche Gewindeaufnahme die Geometrie des Rohres nicht schwächen soll, ist die Tiefe der Gewindeaufnahme vorzugsweise kleiner als die Höhe des Wulstes gemessen im Bereich der Mittellängsachse der Gewindeaufnahme. The bead has the particular advantage that a screw connection between the cooling tube and the cover plate can be realized, without causing the wall thickness of the cooling tube is weakened. It is understood that the bead for a screw must have a sufficient sizing. In particular, the bead must be so large that in relation to the cooling tube radially oriented threaded receptacle can be formed in it. Since such a threaded receptacle should not weaken the geometry of the tube, the depth of the threaded receptacle is preferably smaller than the height of the bead measured in the region of the central longitudinal axis of the threaded receptacle.
Darüber hinaus muss der Wulst breit genug sein, um genügend widerstandsfähig im Hinblick auf Kräfte zu sein, die über eine Verschraubung auf den Wulst übertragen werden. Die Breite des Wulstes soll daher in einem Verhältnis von 1 ,5 bis 2,5 zum Durchmesser der Gewindeaufnahme stehen. In addition, the bead must be wide enough to be sufficiently resistant to forces transmitted to the bead via a threaded connection. The width of the bead should therefore be in a ratio of 1, 5 to 2.5 to the diameter of the threaded receptacle.
Da die Kühlrohre vorzugsweise aus Kupfer oder einem Kupferwerkstoff bestehen, der eine geringere Festigkeit aufweist als das Deckblech, das vorzugsweise aus Stahl besteht, ist in vorteilhafter Weiterbildung vorgesehen, dass in die Gewindebohrungen Gewindehülsen eingesetzt sind. Die Gewindehülsen können aufgrund ihres größeren Durchmessers gegenüber dem eigentlichen Schraubelement höhere Kräfte übertragen. Since the cooling tubes preferably consist of copper or a copper material which has a lower strength than the cover plate, which preferably consists of steel, it is provided in an advantageous development that threaded sleeves are inserted into the threaded bores. The threaded sleeves can transmit higher forces compared to the actual screw due to their larger diameter.
Die Schraubverbindung kann entweder durch Schrauben erfolgen, die nach der Positionierung des Rohres an der Kühlplatte von der ofenäußeren Seite durch das Deckblech in die Gewindeaufnahmen geschraubt werden, in denen gegebenenfalls Gewindehülsen angeordnet sind. Alternativ können auch Stehbolzen an dem Wulst befestigt sein, wobei diese Stehbolzen durch Öffnungen in Deckblechen geführt werden und dort über Muttern fixiert werden. The screw can be done either by screws, which are screwed after the positioning of the tube to the cooling plate from the furnace outer side through the cover plate into the threaded holes in which threaded sleeves are optionally arranged. Alternatively, stud bolts can be attached to the bead, these studs are passed through openings in cover plates and fixed there by nuts.
Alternativ zu der schraubtechnischen Verbindung besteht selbstverständlich auch die Möglichkeit einer stoffschlüssigen Verbindung zwischen dem Kühlrohr und dem Deckblech. Eine stoffschlüssige Verbindung mittels eines solchen Wulstes hat den Vorteil, dass größere Sicherheiten gegen Undichtigkeiten im Vergleich zu einer unmittelbaren Verschweißung der Rohrwandung mit der Stahlplatte bestehen. Die Wärmeeinflusszone beim Schweißen befindet sich durch den Wulst in einem größeren Abstand zu dem Kühlmittel leitenden Teil des Kühlrohres. Thermisch induzierte Gefügeveränderungen beeinträchtigen nicht die Festigkeit oder gar die Dichtigkeit des Kühlmittel leitenden Teils des Kühlrohres. Ferner kann die Schweißnaht haltbarer an einer ebenen Oberfläche des Wulstes erzeugt werden im Gegensatz zu der gekrümmten Oberfläche eines Rohres. Of course, as an alternative to the screw connection, there is also the possibility of a cohesive connection between the cooling tube and the cover plate. A cohesive connection by means of such a bead has the advantage that greater security against leaks in comparison to an immediate welding of the pipe wall with the steel plate. The heat-affected zone during welding is located by the bead at a greater distance from the coolant-conducting part of the cooling tube. Thermally induced microstructural changes do not affect the strength or even the tightness of the coolant-conducting part of the cooling tube. Furthermore, the weld may be made more durable on a flat surface of the bead, as opposed to the curved surface of a pipe.
Grundsätzlich verhält es sich aber so, dass eine schraubtechnische Verbindung wesentlich kürzere Montagezeiten ermöglicht. Zudem wird beim Verschrauben der Verzug eines Kühlelements verringert, da der Schweißaufwand insgesamt reduziert ist. In principle, however, it is the case that a screw connection allows much shorter assembly times. In addition, the distortion of a cooling element is reduced when screwing, since the welding effort is reduced overall.
In vorteilhafter Weiterbildung besitzt das Kühlrohr auf seiner dem Wulst abgelegenen Seite wenigstens einen sich in Längsrichtung des Kühlrohrs erstreckenden Steg, eine so genannte Flosse. Vorzugsweise sind zwei Stege vorgesehen, die zueinander in einem Winkel von 30 bis 90° angeordnet sind. Vorzugsweise beträgt der Winkel 60°. Über diese Stege kann Feuerfestmaterial besser und dauerhafter anhaften. Durch die Stege wird der Formschluss mit dem Feuerfestmaterial verbessert. Die Stege in Kombination mit dem auf der gegenüberliegenden Seite angeordneten Wulst haben zudem den Vorteil, dass das beim Strangpressen eingesetzte Material gleichmäßiger über den Umfang des gesamten Kühlrohrs verteilt ist. Das ist fertigungstechnisch von Vorteil. In an advantageous embodiment, the cooling tube has on its side remote from the bead at least one extending in the longitudinal direction of the cooling tube web, a so-called fin. Preferably, two webs are provided which are mutually arranged at an angle of 30 to 90 °. Preferably, the angle is 60 °. Refractory material can adhere better and more permanently over these webs. By the webs of the positive connection with the refractory material is improved. The webs in combination with the bead arranged on the opposite side also have the advantage that the material used during the extrusion is distributed more uniformly over the circumference of the entire cooling tube. This is production technology advantageous.
Die erfindungsgemäßen Kühlelemente kommen vorzugsweise oberhalb des Schlackenspiegels im Wandbereich eines Ofengefäßes eines Lichtbogenofens zum Einsatz. Die erfindungsgemäßen Kühlelemente können aber auch im Bereich des Deckels und einer Abgasleitung des Ofengefäßes angeordnet sein. The cooling elements according to the invention are preferably used above the slag level in the wall region of a furnace vessel of an electric arc furnace. However, the cooling elements according to the invention can also be arranged in the region of the lid and an exhaust pipe of the furnace vessel.
Die Erfindung wird nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. Es zeigt: The invention will be explained in more detail with reference to an embodiment shown in the drawings. It shows:
Figur 1 eine perspektivische Ansicht eines Kühlelements (Ausschnitt); Figure 1 is a perspective view of a cooling element (detail);
Figur 2 eine vergrößerte Ansicht des Kühlelements der Figur 1 und Figure 2 is an enlarged view of the cooling element of Figure 1 and
Figur 3 eine Schnittdarstellung durch ein Kühlrohr an einem Deckblech. 3 shows a sectional view through a cooling tube on a cover plate.
Figur 1 zeigt in perspektivischer Darstellung einen kleinen Teilbereich eines Kühlelements eines nicht näher dargestellten Schmelzofens, insbesondere eines Lichtbogenofens. Von dem Kühlelement 1 ist lediglich ein Deckblech 2 und ein unterhalb des Deckblechs angeordnetes Kühlrohr 3 dargestellt. In der Praxis ist das Deckblech 2 wesentlich größer und bildet ein Wandsegment eines Ofengefäßes. Dieses Wandsegment befindet sich in der Einbaulage oberhalb des Schmelzspiegels. Die Kühlrohre 3 sind der Ofeninnenseite des Schmelzofens zugewandt. Sie werden in nicht näher dargestellter Weise von einem Kühlmittel durchströmt. Zudem sind sie ebenfalls in nicht näher dargestellter Weise von einem Feuerfestmaterial umgeben, um sie vor der im Lichtbogenofen herrschenden Temperatur zu schützen. Das Besondere bei dem erfindungsgemäßen Kühlelement ist die Art der Ausgestaltung des Kühlrohrs 3 in Verbindung mit der Befestigung. Figure 1 shows a perspective view of a small portion of a cooling element of a melting furnace, not shown, in particular an electric arc furnace. Of the cooling element 1, only a cover plate 2 and a below the cover plate arranged cooling tube 3 is shown. In practice, the cover plate 2 is substantially larger and forms a wall segment of a furnace vessel. This wall segment is located in the installed position above the melting mirror. The cooling tubes 3 face the furnace inside the melting furnace. They are flowed through in a manner not shown by a coolant. In addition, they are also surrounded in a manner not shown by a refractory material to protect them from the prevailing in the electric arc furnace temperature. The special feature of the cooling element according to the invention is the nature of the design of the cooling tube 3 in connection with the attachment.
Figur 2 zeigt, dass das Kühlrohr 3 kreisrund ist, allerdings in seinem in der Bildebene oberen, d. h. dem Deckblech 2 zugewandten Seite einen durchgehenden, sich in Längsrichtung des Kühlrohrs 3 erstreckenden Wulst 4 besitzt. In diesen Wulst sind mehrere Gewindeaufnahmen ausgebildet, die ebenfalls in Längsrichtung des Kühlrohrs 3 zueinander beabstandet sind. In jede der Gewindeaufnahmen 5 ist eine Gewindehülse 6 eingesetzt, in die wiederum eine Schraube 7 greift, die durch Durchgangslöcher im Deckblech 2 ausgebildet sind. Bei den Schrauben 7 handelt es sich um Senkkopfschrauben, die in der Einbaulage nicht über die Außenseite bzw. Oberfläche des Deckblechs 2 vorstehen. Anhand der Figur 2 ist ferner zu erkennen, dass auf der dem Deckblech 2 abgewandten Seite des Kühlrohrs 3 zwei Stege 8, 9 angeordnet sind. Die Stege 8, 9 dienen zur verbesserten Verbindung eines nicht näher dargestellten Feuerfestmaterials mit dem Kühlrohr 3. Figure 2 shows that the cooling tube 3 is circular, but in its upper in the image plane, d. H. the cover plate 2 side facing a continuous, extending in the longitudinal direction of the cooling tube 3 bead 4 has. In this bead a plurality of threaded receptacles are formed, which are also spaced apart in the longitudinal direction of the cooling tube 3 to each other. In each of the threaded receptacles 5, a threaded sleeve 6 is inserted, in turn, a screw 7 engages, which are formed through through holes in the cover plate 2. The screws 7 are countersunk screws which do not protrude beyond the outside or surface of the cover plate 2 in the installed position. It can also be seen from FIG. 2 that two webs 8, 9 are arranged on the side of the cooling tube 3 facing away from the cover plate 2. The webs 8, 9 are used for improved connection of a refractory material not shown with the cooling pipe. 3
Figur 3 zeigt, dass die Stege 8, 9 in einem Winkel W von 60° zueinander stehen und etwa die gleich Wandstärke aufweisen wie der rohrförmige Abschnitt des Kühlrohrs 3. FIG. 3 shows that the webs 8, 9 are at an angle W of 60 ° to one another and have approximately the same wall thickness as the tubular section of the cooling tube 3.
Anhand der Figur 3 ist ferner zu erkennen, dass die Gewindeaufnahme 5 in dem Wulst 4 eine Tiefe T aufweist, die gegenüber der Höhe H1 der Wulst kleiner oder gleich ist. In diesem Ausführungsbeispiel beträgt die Tiefe T der Gewindeaufnahme 5 18 mm bei einer entsprechenden Höhe H1 des Wulstes 4. Die Gewindeaufnahme 5 besitzt einen Durchmesser von 20 mm zur Aufnahme einer Gewindehülse M20 x 1 ,5 mit einem Innengewinde M16 x 2. Bei einer Breite B des Wulstes 4 von 40 mm ergibt sich beiderseits der Gewindeaufnahme 5 eine verbleibende Restwanddicke von 10 mm. Der rohrförmige Abschnitt des Kühlrohrs besitzt eine Wanddicke von 12 mm. Der Außendurchmesser beträgt 89,8 mm. Die beiden Stege 8, 9 stehen radial von dem rohrförmigen Abschnitt des Kühlrohrs 3 ab. Die Stege 8, 9 sind etwa doppelt so hoch wie breit. It can also be seen from FIG. 3 that the threaded receptacle 5 in the bead 4 has a depth T which is less than or equal to the height H1 of the bead. In this embodiment, the depth T of the threaded receptacle 5 is 18 mm at a corresponding height H1 of the bead 4. The threaded receptacle 5 has a diameter of 20 mm for receiving a threaded sleeve M20 x 1, 5 with an internal thread M16 x 2. At a width B of the bead 4 of 40 mm results on both sides of the threaded receptacle 5 a remaining wall thickness of 10 mm. The tubular portion of the cooling tube has a wall thickness of 12 mm. The outer diameter is 89.8 mm. The two webs 8, 9 are radially from the tubular portion of the cooling tube 3 from. The webs 8, 9 are about twice as high as they are wide.
Bei der dargestellten Anordnung befindet sich die Mittellängsachse L des Kühlrohrs 3 in einem Abstand D = 60 mm von der dem Ofeninneren zugewandten Seite des Deckblechs 2. Das Deckblech 2 besitzt eine Dicke von vorzugsweise ebenfalls 12 mm. In the illustrated arrangement, the central longitudinal axis L of the cooling tube 3 is at a distance D = 60 mm from the furnace interior facing side of the cover plate 2. The cover plate 2 has a thickness of preferably also 12 mm.
W W
Bezuaszeichen: Bezuaszeichen:
1 - Kühlelement 1 - Cooling element
2 - Deckblech 2 - cover plate
3 - Kühlrohr  3 - cooling tube
4 - Wulst  4 - bead
5 - Gewindeaufnahme 5 - Thread receiving
6 - Gewindehülse6 - threaded sleeve
7 - Schraube 7 - screw
8 - Steg  8 - footbridge
9 - Steg  9 - footbridge
Höhe v. 4 Height v. 4
Durchmesser v. 5 Höhe v. 4  Diameter v. 5 height v. 4
Längsachse Tiefe v. 5  Longitudinal axis depth v. 5
Winkel  angle

Claims

Patentansprüche claims
1 . Kühlelement für einen Schmelzofen mit einem Deckblech (2) und wenigstens einem an dem Deckblech (2) befestigten Kühlrohr (3), dadurch gekennzeichnet, dass das wenigstens eine Kühlrohr (3) auf seiner dem Deckblech (2) zugewandten Seite einen Wulst (4) aufweist, über welchen es mit dem Deckblech (2) verbunden ist. 1 . Cooling element for a melting furnace with a cover plate (2) and at least one cooling tube (3) attached to the cover plate (2), characterized in that the at least one cooling tube (3) has a bead (4) on its side facing the cover plate (2). has, over which it is connected to the cover plate (2).
2. Kühlelement nach Anspruch 1 , dadu rch gekennzeic hnet, dass sich der Wulst (4) in Längsrichtung des Kühlrohrs (3) erstreckt. 2. Cooling element according to claim 1, dadu rch gekennzeic hnet that extends the bead (4) in the longitudinal direction of the cooling tube (3).
3. Kühlelement nach Anspruch 1 oder 2, dadurch geken nzeichnet, dass der Wulst (4) eine konstante Breite (B) aufweist. 3. Cooling element according to claim 1 or 2, characterized Porsche Style nzeichnet that the bead (4) has a constant width (B).
4. Kühlelement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verbindung zwischen dem Kühlrohr (3) und dem Deckblech (2) eine Schraubverbindung ist. 4. Cooling element according to one of claims 1 to 3, characterized in that the connection between the cooling tube (3) and the cover plate (2) is a screw connection.
5. Kühlelement nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass in dem Wulst (4) Gewindeaufnahmen (5) ausgebildet sind. 5. Cooling element according to one of claims 1 to 4, characterized in that in the bead (4) threaded receptacles (5) are formed.
6. Kühlelement nach Anspruch 5, dadurch gekennzeichnet, dass die Gewindeaufnahmen (5) eine Tiefe (T) aufweisen, die kleiner oder gleich ist als die Höhe (H1 ) des Wulstes (4). 6. Cooling element according to claim 5, characterized in that the threaded receivers (5) have a depth (T) which is less than or equal to the height (H1) of the bead (4).
7. Kühlelement nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Breite (B) des Wulstes (4) zum Durchmesser (D1 ) der Gewindaufnahmen (5) im Verhältnis 1 ,5 bis 2,5 steht. 7. Cooling element according to claim 5 or 6, characterized in that the width (B) of the bead (4) to the diameter (D1) of the threaded receptacles (5) in the ratio 1, 5 to 2.5 stands.
8. Kühlelement nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass in die Gewindeaufnahmen (5) Gewindehülsen (6) eingesetzt sind. 8. Cooling element according to one of claims 5 to 7, characterized in that in the threaded receptacles (5) threaded sleeves (6) are used.
9. Kühlelement nach Anspruch 1 , dadurch gekennzeichnet, dass die Verbindung zwischen dem Kühlrohr (3) und dem Deckblech (2) eine stoffschlüssige Verbindung ist. 9. Cooling element according to claim 1, characterized in that the connection between the cooling tube (3) and the cover plate (2) is a cohesive connection.
10. Kühlelement nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das Kühlrohr (3) auf seiner dem Wulst (4) abgelegenen Seite mit wenigstens einem sich in Längsrichtung des Kühlrohres (3) erstreckenden Steg (8, 9) versehen ist. 10. Cooling element according to one of claims 1 to 9, characterized in that the cooling tube (3) on its the bead (4) remote side with at least one in the longitudinal direction of the cooling tube (3) extending web (8, 9) is provided.
1 1 . Kühlelement nach Anspruch 10, dadurch gekennzeichnet, dass zwei Stege (8, 9) vorgesehen sind, die zueinander in einem Winkel von 30° bis 90° angeordnet sind. 1 1. Cooling element according to claim 10, characterized in that two webs (8, 9) are provided which are mutually arranged at an angle of 30 ° to 90 °.
12. Kühlelement nach einem der Ansprüche 1 bis 1 1 , dadurch gekennzeichnet, dass das Kühlrohr (8, 9) im Strangpressverfahren aus einem Kupferwerkstoff hergestellt ist. 12. Cooling element according to one of claims 1 to 1 1, characterized in that the cooling tube (8, 9) is made by extrusion of a copper material.
EP13714540.5A 2012-03-13 2013-02-22 Cooling element for a melting furnace Active EP2825677B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012004868A DE102012004868A1 (en) 2012-03-13 2012-03-13 Cooling element for a melting furnace
PCT/DE2013/000096 WO2013135221A1 (en) 2012-03-13 2013-02-22 Cooling element for a melting furnace

Publications (2)

Publication Number Publication Date
EP2825677A1 true EP2825677A1 (en) 2015-01-21
EP2825677B1 EP2825677B1 (en) 2018-11-07

Family

ID=48049723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13714540.5A Active EP2825677B1 (en) 2012-03-13 2013-02-22 Cooling element for a melting furnace

Country Status (4)

Country Link
EP (1) EP2825677B1 (en)
DE (1) DE102012004868A1 (en)
TR (1) TR201901030T4 (en)
WO (1) WO2013135221A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012013494A1 (en) 2012-07-09 2014-01-09 Kme Germany Gmbh & Co. Kg Cooling element for a melting furnace

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3053237A (en) 1959-11-02 1962-09-11 Sunrod Mfg Corp Furnace lining
JPS52137505A (en) * 1976-05-13 1977-11-17 Balcke Duerr Ag Tube wall comprising plurality of tubes extending horizontally or slantly in parallel with each other
DE2745622C2 (en) 1977-10-11 1983-02-10 Mannesmann AG, 4000 Düsseldorf Vessel for a metal melting furnace, in particular an electric arc furnace
DE4446542A1 (en) 1994-12-24 1996-06-27 Abb Management Ag Furnace vessel for a direct current arc furnace
DE19751356C2 (en) * 1997-11-20 2002-04-11 Sms Demag Ag Cooling elements for shaft furnaces
US6330269B1 (en) * 2000-02-22 2001-12-11 Amerifab, Inc. Heat exchange pipe with extruded fins

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013135221A1 *

Also Published As

Publication number Publication date
EP2825677B1 (en) 2018-11-07
TR201901030T4 (en) 2019-02-21
DE102012004868A1 (en) 2013-09-19
WO2013135221A1 (en) 2013-09-19

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