DE102014208516A1 - Apparatus for supporting an electrode arm of a high current supply to a metallurgical furnace - Google Patents

Abstract

The invention relates to a device (1, 18) for supporting an electrode arm (2, 21, 22) of a high current supply for a metallurgical furnace, in particular an electric arc furnace, comprising at least one support (3) and at least one with an electrode arm (2, 21 , 22) facing the end of the support (3), transversely to the support (3) extending and via an electrical insulation (4) with the electrode arm (2, 21, 22) connectable column head (5), wherein the support (3) and the support head (5) are formed from a steel, characterized in that at least at a portion of an outer side of the support head (5) an antimagnetic metallic protective layer (9) is arranged.

Description

The invention relates to a device for supporting an electrode arm of a high-current supply for a metallurgical furnace, in particular an electric arc furnace, comprising at least one support and at least one connected to the electrode arm end of the support, extending transversely to the support and an electrical insulation with the electrode arm connectable column head, wherein the support and the column head are formed of a steel.

The invention further relates to a system for supporting electrode arms of a high-current supply for a metallurgical furnace, in particular an electric arc furnace, wherein each electrode arm is supported by a separate device, each device at least one support and at least one end of the support facing the respective electrode arm connected, extending transversely to the support and connectable via an electrical insulation with the respective electrode arm column head, wherein the supports and the support heads are formed of steel.

Furthermore, the invention relates to a method for producing a device for supporting an electrode arm of a high-current supply for a metallurgical furnace, in particular an electric arc furnace.

In furnace construction, three-phase current conductors, in particular AC conductors, are designed in the form of a water-cooled electrode arm. The electrode arms are provided with a supporting structure for the transmission of mechanical forces. Usually, the support structure is electrically insulated from the electrode arms.

Out DE 1 565 382 A . EP 0 061 612 A1 . WO 2011/110522 A1 . EP 0 080 954 A1 . EP 0 184 140 A2 and WO 2011/009622 A1 It is known to carry an electrode arm of a high-current supply for a metallurgical furnace by means of a support, wherein an electrical insulation is arranged between the electrode arm and the support.

Parts of such a support structure, in particular the portions of the support structure adjacent to the electrode arms, are heated due to a magnetic field generated by a current flowing through the electrode arms and the induced eddy currents. Depending on the materials used for the support structure, this heating can be large, so that cooling, for example by means of water, the heated parts of the support structure in operation is required so as not to destroy the very temperature-sensitive electrical insulation between the electrode arms and the supports.

Usually, normal steel or stainless steel is used to form a support structure. Other materials are not suitable for the formation of a support structure due to the high mechanical loads acting on them. A heating of parts of a support structure made of a normal steel is very large, while a heating of parts made of a stainless steel, depending on selected Edelstahlart comparatively lower.

The object of the invention is to reduce heating of parts of a support structure in the operation of a metallurgical furnace and the energy losses associated with this heating.

This object is achieved by a device according to claim 1, a system according to claim 7 and a method according to claim 9. Advantageous embodiments are given in the subclaims, which taken alone or in different combination with each other can represent an aspect of the invention.

Claim 1 proposes a device for supporting an electrode arm of a high current supply for a metallurgical furnace, in particular an electric arc furnace, comprising at least one support and at least one connected to the electrode arm end of the support, extending transversely to the support and an electrical insulation can be connected to the electrode arm column head, wherein the support and the column head are formed of a steel, characterized in that at least on a portion of an outer side of the column head, a non-magnetic metallic protective layer is arranged.

The antimagnetic metallic protective layer shields a section of the column head arranged therebelow, so that a magnetic field generated by a current flowing through the electrode arm during operation of a metallurgical arm can not or only very slightly penetrate into the section of the column head which lies below the protective layer. In this way, in particular, the formation of eddy currents in this section of the column head can be reduced. Consequently, heating of the portion is avoided, as occurs in conventional support structures, so that with the invention energy losses are reduced by such heating.

The column head can be provided on its outside completely with the non-magnetic metallic protective layer. Preferably, at least those portions of the support head are provided with the protective layer, which experience has shown that most strongly acted upon by a magnetic field.

In addition to the column head, a portion of predetermined size of the column adjoining the column head may be partially or completely provided with the antimagnetic metallic protective layer. The size of the section is preferably chosen such that the formation of eddy currents in the section is completely or almost completely prevented.

The device may also have two or more corresponding supports connected to a single column head. Also, the device may include two or more corresponding pillar heads connected to one, two or more pillars. A column head preferably runs at right angles to the support connected to it. The support and the column head can be made of a normal steel or a stainless steel. A support of the device can be arranged, in particular height-adjustable, for the guidance of an electrode arm supported thereon.

The support head and / or the support may be used to introduce a cooling fluid, such as water, into or out of a fluid-cooled electrode arm.

According to an advantageous embodiment, the protective layer is arranged at least on a part of the electrode arm-facing side of the support head. According to experience, the side of the column head facing the electrode arm is exposed during operation to particularly strong magnetic fields, which makes a shielding according to the invention particularly advantageous for avoiding energy losses by heating this side of the column head as far as possible.

According to a further advantageous embodiment, the protective layer is arranged at least on a part of the side facing away from the electrode arm of the column head. According to experience, the side of the column head facing the electrode arm is exposed to particularly strong magnetic fields during operation, which makes a shielding of this invention particularly advantageous in order to largely avoid energy losses by heating this side of the column head. In particular, when two electrode arms are arranged at the same height and a further electrode arm is arranged so higher than the other two electrode arms, that the electrode arms are arranged in cross section at vertices of an equilateral triangle, located on the higher electrode arm column head is facing away from the supported him by the electrode arm Side exposed to strong magnetic fields. Therefore, it is particularly advantageous to provide such a support head on its side facing away from him supported by the electrode arm with a non-magnetic metallic protective layer.

A further advantageous embodiment provides that the protective layer is at least partially formed of copper or aluminum. As a result, heating of the support head and optionally the support and associated energy losses compared to the exclusive use of a normal steel without shielding invention are extremely reduced and compared to an exclusive use of stainless steel without shielding invention significantly.

Advantageously, the protective layer is at least partially formed by a metal plate. This makes possible a simple arrangement of the antimagnetic metallic protective layer on the column head and optionally the support. A metal plate can be connected by mechanical means or cohesively, for example by welding, with the support head and optionally the support. The protective layer can also be completely formed by one, two or more metal plates.

Furthermore, it is considered advantageous if the column head at least two parallel and spaced from each other, extending transversely to the support plates, one of which is connected via the electrical insulation with the electrode arm, and at least two of the plates each laterally interconnecting, itself extending between the plates, parallel to each other and spaced from each other, extending transversely to the support side plates, wherein at least one extending transversely to the support end of at least one plate flush with an outer side of the side closest to this end face plate. It has been found that, in particular via a side wall, excellent portions of a plate tend to heat up very much when subjected to a magnetic field. Therefore, it is advantageous if end faces of the plates are flush with the outer sides of the respective side plate, whereby a further reduction of energy losses can be effected.

With claim 7, a system for supporting electrode arms of a high current supply for a metallurgical furnace, in particular an electric arc furnace, proposed each electrode arm is supported by means of its own device for supporting the respective electrode arm, each device having at least one support and at least one support head connected to an end of the support facing the respective electrode arm, extending transversely to the support and connectable to the respective electrode arm via electrical insulation wherein the supports and the support heads are formed from a steel, characterized in that at least one device according to one of the aforementioned embodiments or any combination thereof is formed. With this system, the advantages mentioned above with respect to the device are connected accordingly. It is also possible to design two or more devices according to one of the aforementioned embodiments or any combination thereof.

According to an advantageous embodiment, the system is designed such that two pillar heads are arranged equally high and another pillar head is arranged higher than the other two pillar heads such that the pillar heads are arranged at vertices of an equilateral triangle, wherein at least the higher arranged column head device having is formed according to one of the aforementioned embodiments or any combination thereof. This is advantageous since, as described above, the higher column head is, according to experience, subjected to the strongest magnetic fields, so that an arrangement according to the invention of the protective layer should be made on the higher column head.

• – Bereitstellen von wenigstens einer Stütze und wenigstens einem mit einem dem Elektrodenarm zugewandten Ende der Stütze verbundenen, quer zu der Stütze verlaufenden und über eine elektrische Isolierung mit dem Elektrodenarm verbindbaren Stützenkopf, wobei die Stütze und der Stützenkopf aus einem Stahl gebildet werden; und
• – Anordnen einer antimagnetischen metallischen Schutzschicht zumindest an einem Abschnitt einer Außenseite des Stützenkopfes.

Claim 9 proposes a method for producing a device for supporting an electrode arm of a high-current feed for a metallurgical furnace, in particular an electric arc furnace, comprising the steps:

• - Providing at least one support and at least one connected to the electrode arm end of the support, extending transversely to the support and connectable via an electrical insulation with the electrode arm column head, wherein the support and the column head are formed of a steel; and
• - Arranging a non-magnetic metallic protective layer at least on a portion of an outer side of the support head.

The provision of the support and the support head may be accomplished by use of a conventionally available, for example already used, support and support head unit. The process according to the invention then equals a treatment process. Alternatively, a support and a column head, for example monolithic, may be manufactured specifically for the purpose of forming the device.

The placement of the antimagnetic metallic protective layer on the column head and optionally on the support can be done by applying a coating, for example by plating. Alternatively or additionally, a non-magnetic metal plate, for example of copper or aluminum, mechanically or cohesively connected to the support head and optionally with the support.

According to an advantageous embodiment, to provide the support head at least two parallel to each other and spaced from each other, extending transversely to the support plates, one of which is connected via the electrical insulation to the electrode, over at least two extending between the plates, parallel to each other and spaced apart, extending transversely to the support side plates connected to each other in such a way that at least one extending transversely to the support end of at least one plate flush with an outer side of the closest to this end face side plate. This embodiment is connected to the advantages mentioned above with reference to the corresponding embodiment of the device.

In the following, the invention will be explained by way of example with reference to the attached figures with reference to preferred exemplary embodiments, wherein the features illustrated below may represent an aspect of the invention both individually and in various combinations with one another. Show it

1 FIG. 2: a schematic side view of an exemplary embodiment of a device according to the invention, FIG.

2 a schematic representation of a cross section through the in 1 shown device,

3 a schematic representation of a cross section through a further embodiment of a device according to the invention, and

4 : a schematic representation of a cross section through an embodiment of a system according to the invention.

1 shows a schematic side view of an embodiment of an inventive device 1 for supporting an electrode arm 2 a high current supply for a metallurgical furnace. The device 1 includes a support 3 and one with the electrode arm 2 facing end of the support 3 connected, transverse to the support 3 extending and over an electrical insulation 4 with the electrode arm 2 connected column head 5 , The column head 5 is by two headboards 6 and 7 and an intermediate end portion 8th the prop 3 formed, with the headboards 6 and 7 on opposite sides of the support 3 arranged and on the prop 3 are attached. The support 3 and the column head 5 are made of a steel.

At one of the electrode arm 2 facing side of the column head 5 and on one of the electrode arm 2 opposite side of the column head 5 is in each case a non-magnetic metallic protective layer 9 arranged. The between the electrode arm 2 and the support head arranged protective layer 9 is formed of a single metal plate of copper or aluminum. The at the the electrode arm 2 opposite side of the column head 5 arranged protective layer 9 is made of two metal plates made of copper or aluminum.

2 shows a schematic representation of a cross section through the in 1 shown device 1 , The column head 5 has two mutually parallel and spaced apart, transverse to the support 3 running plates 10 and 11 on, of which the plate 10 over the electrical insulation 4 with the electrode arm 2 connected is. Furthermore, the column head comprises 5 two the plates 10 and 11 each side connecting with each other, between the plates 10 and 11 extending, parallel to each other and spaced apart, transverse to the support 3 running side plates 12 and 13 , The cross to the support 3 extending end faces 14 and 15 the plates 10 and 11 close flush with the outsides 16 respectively. 17 the respective closest to the respective end face 14 respectively. 15 arranged side plate 12 respectively. 13 from.

3 shows a schematic representation of a cross section through a further embodiment of a device according to the invention 18 according to the in 2 cross section shown. Same components of this device 18 and the device 1 are given the same reference numerals and will not be explained again.

In contrast to the in 2 shown device 1 close at the device 18 across the column 3 extending end faces 14 and 15 the plate 19 not flush with the outsides 16 respectively. 17 the respective closest to the respective end face 14 respectively. 15 arranged side plate 12 respectively. 13 from.

4 shows a schematic representation of a cross section through an embodiment of a system according to the invention 20 for supporting electrode arms 2 . 21 and 22 a metallurgical furnace. Each electrode arm 2 . 21 respectively. 22 is by means of its own device 1 for supporting the respective electrode arm 2 . 21 respectively. 22 supported. Every device 1 has a support 3 and one with a respective arm of the electrode 2 . 21 respectively. 22 facing end of the support 3 connected, transverse to the support 3 extending and over an electrical insulation 4 with the respective electrode arm 2 . 21 respectively. 22 connected column head 5 on. The pillars 3 and the column heads 5 are made of a steel. The devices 1 are according to the in the 1 and 2 formed embodiment shown. The system 20 is formed such that two support heads 5 , namely, the two lower, the same height are arranged and another column head 5 so much higher than the other two pillar heads 5 An-ordered is that the column heads 5 are arranged at vertices of an equilateral triangle.

LIST OF REFERENCE NUMBERS

1

 contraption

2

 electrode arm

3

 support

4

 insulation

5

 support your head

6

 headboard

7

 headboard

8th

 end

9

 protective layer

10

 plate

11

 plate

12

 side plate

13

 side plate

14

 front

15

 front

16

 outside

17

 outside

18

 contraption

19

 plate

20

 system

21

 electrode arm

22

 electrode arm

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 1565382 A [0005]
• EP 0061612 A1 [0005]
• WO 2011/110522 A1 [0005]
• EP 0080954 A1 [0005]
• EP 0184140 A2 [0005]
• WO 2011/009622 A1 [0005]

Claims (10)

Contraption ( 1 . 18 ) for supporting an electrode arm ( 2 . 21 . 22 ) a high current supply for a metallurgical furnace, in particular an electric arc furnace, comprising at least one support ( 3 ) and at least one with an electrode arm ( 2 . 21 . 22 ) facing end of the support ( 3 ), transversely to the support ( 3 ) and via an electrical insulation ( 4 ) with the electrode arm ( 2 . 21 . 22 ) connectable column head ( 5 ), whereby the support ( 3 ) and the column head ( 5 ) are formed from a steel, characterized in that at least at a portion of an outer side of the column head ( 5 ) a non-magnetic metallic protective layer ( 9 ) is arranged. Contraption ( 1 . 18 ) according to claim 1, characterized in that the protective layer ( 9 ) at least on a part of the electrode arm ( 2 . 21 . 22 ) facing side of the column head ( 5 ) is arranged. Contraption ( 1 . 18 ) according to claim 1 or 2, characterized in that the protective layer ( 9 ) at least on a part of the electrode arm ( 2 . 21 . 22 ) facing away from the support head ( 5 ) is arranged. Contraption ( 1 . 18 ) according to one of claims 1 to 3, characterized in that the protective layer ( 9 ) is at least partially formed of copper or aluminum. Contraption ( 1 . 18 ) according to one of claims 1 to 4, characterized in that the protective layer ( 9 ) is at least partially formed by a metal plate. Contraption ( 1 . 18 ) according to one of claims 1 to 5, characterized in that the column head ( 5 ) at least two parallel to each other and spaced apart, transverse to the support ( 3 ) running plates ( 10 . 11 . 19 ), one of which is about the electrical insulation ( 4 ) with the electrode arm ( 2 . 21 . 22 ) is connectable, and at least two of the plates ( 10 . 11 . 19 ) each laterally interconnecting, between the plates ( 10 . 11 . 19 ) extending, parallel to each other and spaced apart, transverse to the support ( 3 ) extending side plates ( 12 . 13 ), wherein at least one transverse to the support ( 3 ) extending end face ( 14 . 15 ) of at least one plate ( 10 . 11 ) flush with an outside ( 16 . 17 ) closest to this end face ( 14 . 15 ) arranged side plate ( 12 . 13 ) completes. System ( 20 ) for supporting electrode arms ( 2 . 21 . 22 ) of a high current supply for a metallurgical furnace, in particular an electric arc furnace, each electrode arm ( 2 . 21 . 22 ) by means of a separate device ( 1 . 18 ) for supporting the respective electrode arm ( 2 . 21 . 22 ), each device ( 1 . 18 ) at least one support ( 3 ) and at least one with a respective electrode arm ( 2 . 21 . 22 ) facing end of the support ( 3 ), transversely to the support ( 3 ) and via an electrical insulation ( 4 ) with the respective electrode arm ( 2 . 21 . 22 ) connectable column head ( 5 ), wherein the supports ( 3 ) and the column heads ( 5 ) are formed from a steel, characterized in that at least one device ( 1 . 18 ) is formed according to one of claims 1 to 6. System ( 20 ) according to claim 7, characterized in that the system ( 20 ) is designed such that two support heads ( 5 ) are arranged at the same height and another column head ( 5 ) higher than the other two support heads ( 5 ) is arranged that the support heads ( 5 ) are arranged at vertices of an equilateral triangle, wherein at least the higher column head ( 5 ) device ( 1 . 18 ) is formed according to one of claims 1 to 6. Method for producing a device ( 1 . 18 ) for supporting an electrode arm ( 2 . 21 . 22 ) of a high current supply for a metallurgical furnace, in particular an electric arc furnace, comprising the steps: - providing at least one support ( 3 ) and at least one with an electrode arm ( 2 . 21 . 22 ) facing end of the support ( 3 ), transversely to the support ( 3 ) and via an electrical insulation ( 4 ) with the electrode arm ( 2 . 21 . 22 ) connectable column head ( 5 ), whereby the support ( 3 ) and the column head ( 5 ) are formed of a steel; and - arranging a non-magnetic metallic protective layer ( 9 ) at least at a portion of an outer side of the column head ( 5 ). A method according to claim 9, characterized in that for the provision of the column head ( 5 ) at least two parallel to each other and spaced apart, transverse to the support ( 3 ) running plates ( 10 . 11 . 19 ), one of which is about the electrical insulation ( 4 ) with the electrode arm ( 2 . 21 . 22 ) is connectable, at least two between the plates ( 10 . 11 . 19 ) extending, parallel to each other and spaced apart, transverse to the support ( 3 ) extending side plates ( 12 . 13 ) are each laterally interconnected such that at least one transverse to the support ( 3 ) extending end face ( 14 . 15 ) of at least one plate ( 10 . 11 ) flush with a Outside of the closest to this end face ( 14 . 15 ) arranged side plate ( 12 . 13 ) completes.

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