EP1619461B1 - Cooling plate - Google Patents

Description

The invention relates to a cooling plate made of copper or a copper alloy for shaft furnaces according to the features in the preamble of claim 1.

Such a cooling plate counts through the EP 0 951 371 B1 to the state of the art. In the cooling plate a plurality of bores for receiving a coolant, in particular water, are provided which are connected via welded on the plate cold side connecting pipes with a coolant inlet and a coolant outlet. The inner cross section of the connecting pipes is usually adapted to the diameter of the holes. The determination of the connection pipes on the cooling plate is usually carried out in that made in the plate cold side the outer diameter of the connecting pipes adapted recesses low depth, then the cooling plate side ends of the connection pipes inserted into these recesses and then the connection pipes are welded to the cooling plate by fillet welds. A special processing of the plate-side ends of the connection pipes does not take place here. They are usually chamfered mostly on the inside to ensure a better flow of the coolant.

If the connecting pipes are made of copper or a copper alloy, the connecting pipes connected to a steel coolant inlet and coolant outlet are provided with steel sleeves at a distance from the cooling plate. A steel sleeve is required for connecting pipes of copper or a copper alloy in order to produce a gas-tight weld with the shaft furnace jacket. As a result, and also when using steel connecting pipes, it is avoided that copper must be welded in a shaft furnace during assembly of the cooling plates. The welding of copper is technically very complicated and associated with great error risks.

Another problem in the known case is that the testing of the fillet welds, e.g. with the help of a dye penetration test especially for Cu welds, although technically possible, but associated with considerable effort.

Since on one side the connecting pipes have to be welded to the cooling plate and on the other side between the connecting pipes and the shaft furnace jacket a gas-tight connection, in particular by welding; must be made, arise due to the thermal expansion of the cooling plate in use stresses on the welds between the cooling plate and the connecting pipes.

The EP 1 391 521 A1 discloses a copper or low alloy copper alloy cooling plate, for metallurgical furnaces provided with an outer furnace armor sheet, with at least one, preferably at least two, coolant channels extending inside the cooling plate, with coolant tube pieces for coolant flow out through the furnace armor sheet to the outside are guided. On the cooling plate holding tubes are attached, which are provided outside of the furnace armor plate with retaining washers and fix the cooling plate in the direction of the furnace interior. Holding tubes and retaining washers are preferably made of steel.

The invention is - starting from the prior art - the object of the invention to provide a cooling plate made of copper or a copper alloy for shaft furnaces, in which an increased fatigue strength of the connection between the cooling plate and the connecting pipes by better absorption and transmission of the stresses occurring in the field is reached.

This object is achieved with the features specified in claim 1.

The connection pipes are now regardless of whether they are made of copper or a copper alloy, steel or a combination of these materials, provided at their plate-side ends with radially projecting flanges. These flanges are fitted in recesses provided on the plate cold side shallow depth and then welded at its periphery with the plate cold side. As a result, the weld is no longer in the area in the the voltage maxima occur. Conventional welding methods, friction stir welding, electron beam welding or even laser welding can be used.

The flanges are formed by flaring the plate-side ends of the connecting pipes. Such flaring can be easily done both with connection pipes made of copper or a copper alloy or steel. Comparatively thin-walled connection pipes can be used.

In order to weld a V-seam between a flange and the plate cold side, which is much easier to weld than a fillet weld, it is provided according to the features of claim 2 that the flanges on the connection tubes on the outer circumference and the recesses in the plate cold side provided with bevels on the inner circumference. In this way, a nearly ideal weld preparation is created and ensured with the V-seam increased fatigue strength of the connection.

When according to claim 3, the connection pipes in the concave transition areas are blasted onto the flanges, e.g. By shot blasting, the strength values of the connection pipes in the area of the flanges can be further increased.

According to the features of claim 4, it is possible that each hole in the cooling plate can be connected via connecting pipes to the coolant inlet and the coolant outlet.

In view of the fact that the practice more often requires the connection of oval holes in a cooling plate with connecting pipes or the coupling of two or more smaller diameter holes in the cooling plate with connecting pipes, which is the greatest possible overlap of the connecting pipes with the Boh required ments, the invention provides according to claim 5, that at least two adjacent holes are connected by a connecting pipe with the coolant inlet and the coolant outlet.

In this context, it may then be advantageous according to claim 6, that the plate-side ends of the connecting pipes are deformed oval. This embodiment has its advantage when the holes in the cooling plate are formed oval (regardless of their production) or when at least two small-diameter holes are to be coupled with a connection pipe.

It is particularly expedient according to the features of claim 7 that are made of copper or copper alloy existing connection pipes at a distance from the flanges with sleeves made of steel. The use of steel sleeves avoids the need to weld copper at the construction site when mounting a cooling plate.

If according to claim 8, the connecting pipes made of steel or of a steel alloy, it is advantageous that the chamfers are coated on the connecting pipes and / or the chamfers in the recesses with nickel.

If the flanges are also formed of a steel alloy and provided with chamfers, then it is expedient for the chamfers on the flanges and / or the chamfers in the recesses in the cold plate side to be coated with nickel.

Figur 1

eine Kühlplatte für einen Schachtofen von der Plattenkaltseite her gesehen;

Figur 2

eine Seitenansicht der Kühlplatte der Figur 1 in Richtung des Pfeils II der Figur 1 gesehen;

Figur 3

eine Draufsicht auf die Kühlplatte der Figur 1;

Figur 4

in vergrößertem Maßstab, teilweise im Schnitt, den Verbindungsbereich zwischen der Kühlplatte und einem Anschlussrohr gemäß dem Ausschnitt IV der Figur 2 und

Figur 5

die Darstellung der Figur 4 vor der Verbindung eines Anschlussrohrs mit der Kühlplatte.

The invention is explained in more detail with reference to an embodiment shown in the drawings. Show it:

FIG. 1

a cooling plate for a shaft furnace as seen from the cold plate side;

FIG. 2

a side view of the cooling plate of FIG. 1 in the direction of arrow II of the FIG. 1 seen;

FIG. 3

a plan view of the cooling plate of FIG. 1 ;

FIG. 4

on an enlarged scale, partially in section, the connection area between the cooling plate and a connecting pipe according to the section IV of FIG. 2 and

FIG. 5

the representation of FIG. 4 before connecting a connection pipe to the cooling plate.

In the FIGS. 1 to 5 1 is a cooling plate made of a copper alloy for shaft furnaces. The cooling plate 1 has on the Plattenheißseite 2 alternately grooves 3 and 4 projections. On the plate cold side 5, the cooling plate 1 is flat.

In the cooling plate 1 a plurality of holes 6 are provided as deep holes, which serve to receive a coolant, in particular water. These designed as blind holes holes 6 have at the inlet ends 7 plug. 8

The bores 6 can be connected individually or in groups (with a correspondingly reduced diameter) with connection pipes 9, 10. In the FIGS. 1 to 5 Each bore is conductively connected to a connecting pipe 9, 10 coolant. It is also conceivable that in the region of the connecting pipes 9, 10 holes 6 klei neren diameter groups are grouped together (two to four holes 6) and these holes 6 are then connected via direct connections or via oblique holes with the connecting pipes 9, 10.

In the exemplary embodiment, the connection pipes 9, 10 coupled with steel coolant inlets 12 and coolant outlets 13 are made of a copper alloy. They are provided with circumferential sleeves 11 made of steel, which are gas-tight welded to a shaft furnace jacket.

As the FIGS. 4 and 5 Specifically, the connection pipes 9 (correspondingly also the connection pipes 10) are provided at their plate-side ends 14 with flanges 15, which are formed by flanging. The flanges 15 are provided on the outer periphery with chamfers 16. The concave transition regions 25 are shot peened.

In the area of a bore 6 in the cooling plate 1 or in the region of a group of bores 6, a recess 17 is incorporated in the plate cold side 5 ( FIG. 5 ). The depth T of the recess 17 is less than the thickness D of the material between the bore 6 and the plate cold side 5. At the inner periphery of the recess 17, this is equipped with a chamfer 18.

Is according to FIG. 5 a connection pipe 9 is inserted into a recess 17, 17 is a V-shaped space formed between the outer periphery 16 of the flange 15 of the connecting pipe 9 and the inner periphery 18 of the recess, which can be used in an ideal way to now according to FIG. 4 to be able to lay a V-shaped weld 19.

As already indicated above, according to the representations of FIGS. 1 to 5 Each bore 6 at the top and bottom are coupled to a connecting pipe 9, 10. But it is also conceivable that two or more smaller diameter holes 6 and oval channels are coupled to a connecting pipe 9, 10.

To handle the cooling plate 1, an eyelet 22 is screwed into a threaded bore 20 in the upper end face 21.

Furthermore, it can be seen that 5 threaded holes 23 are provided on the plate cold side, can be screwed into the mounting screws 24.

Reference numerals:

1 -

cooling plate

2 -

Plate hot side

3 -

groove

4 -

projections

5 -

Plate cold side

6 -

Drilling in 1

7 -

Incoming v. 6

8th -

Plug in 7

9 -

connecting pipe

10 -

connecting pipe

11 -

cuffs

12 -

Coolant inlets

13 -

coolant discharges

14 -

Ends v. 9, 10

15 -

Flanges at 14

16 -

Chamfers at 15

17 -

Recess in 5

18 -

Chamfer in 17

19 -

Weld

20 -

Threaded hole in 21

21 -

Front side v. 1

22 -

eyelet

23 -

Threaded holes in 5

24 -

mounting screws

25 -

concave transition areas

D -

material thickness

T -

Depth v. 17

Claims (8)

1. Cooling plate made of copper or a copper alloy for shaft furnaces, in which a plurality of bores (6) are provided to receive a cooling medium and are connected to a cooling medium inlet (12) and a cooling medium outlet (13) by means of connecting tubes (9, 10) welded on the cold side (5) of the plate, wherein the connecting tubes (9, 10) have flanges (15) and are inserted with the flanges (15) in recesses (17) of the cold side (5) of the plate and are welded at the periphery of the flanges (15) to the cold side (5) of the plate, characterised in that the connecting tubes (9, 10) are provided at their plate-side ends (14) with flanges (15), the flanges (15) on the connecting tubes (9, 10) being flangings of the plate-side ends (14) of the connecting tubes (9, 10).
2. Cooling plate according to claim 1, characterised in that the flanges (15) on the connecting tubes (9, 10) on the outer periphery and the recesses (17) in the cold side (5) of the plate on the inner periphery are provided with bevels (16, 18).
3. Cooling plate according to claim 1, characterised in that the connecting tubes (9, 10) are blasted on the flanges (15) in the concave transmission regions (25).
4. Cooling plate according to any one of claims 1 to 3, characterised in that each bore (6) is connected by means of connecting tubes (9, 10) to the cooling medium inlet (12) or the cooling medium outlet (13).
5. Cooling plate according to any one of claims 1 to 3, characterised in that at least two bores (6) located next to one another are connected by a connecting tube (9, 10) to the cooling medium inlet (12) or the cooling medium outlet (13).
6. Cooling plate according to any one of claims 1 to 5, characterised in that the plate-side ends (14) of the connecting tubes (9, 10) are shaped to be oval.
7. Cooling plate according to any one of claims 1 to 6, characterised in that connecting tubes (9, 10) consisting of copper or of copper alloy are provided, at a distance from the flanges (15), with collars (11) made of steel.
8. Cooling plate according to any one of claims 2 to 6, characterised in that the bevels (16) on the connecting tubes (9, 10) and/or the bevels (18) in the recesses (17) are coated with nickel in the case of connecting tubes (9, 10) made of steel or of a steel alloy.

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