EP1826518A1 - Plaque de refroidissement pour fours à cuve - Google Patents

Abstract

Blast furnace cooling plate consists of copper or copper alloy with several coolant holes in a series separated by gaps and parallel to heating side (2), The ratio of hole diameter to (d) to the mean distance s between adjacent holes is given by the inequality d = s 3d.

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 in the scope of DE 29 07 511 C2 to the state of the art. It has a plurality of bores for a coolant extending in a row at a distance from each other and extending parallel to the grooves. The holes are connected at the ends with transversely directed connecting pipes for coupling to a coolant inlet and a coolant outlet. They are introduced by deep hole drilling in the cooling plate. As a rule, the holes have a diameter of 50 mm to 65 mm. The center distance between two adjacent holes is uniform. It is approximately four times the diameter of a hole.

Due to the arrangement and dimensions of the holes, a known cooling plate has a thickness between 90 mm and 150 mm incl. Of projections on the hot side. This thickness is determined by the diameter of the holes and the fact that the material thickness between the holes and the hot side and the cold side of the cooling plate should be between 15 mm and 30 mm to prevent leaks. This results in a high weight for the cooling plate associated with a relatively high cost of materials.

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, which has the same or better cooling properties without risk of leakage a smaller thickness.

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

Due to the fact that now the ratio of the diameter of the holes is designed to the center distance of two adjacent holes such as d ≤ s <3d, a hole with a previously large diameter can be replaced by a plurality of holes with smaller diameters. This has the advantage that the thickness of the cooling plate can be reduced by 25 mm to 35 mm, so that the material use is significantly reduced. The economy in providing a cooling plate is increased.

In addition to reducing the thickness of the cooling plate is achieved by the inventive measure also has a better cooling effect. With approximately the same amount of cooling water as in the design of the prior art results in a temperature reduction of about 60 ° C to 70 ° C on the hot side of the cooling plate. This is due to the larger surface area of the smaller holes relative to a larger diameter hole.

Furthermore, the invention limits the temperature gradient on the hot side. In this way, a more uniform load of the cooling plate is achieved hereby is associated with a reduction of expected on the cooling plate delay.

The invention allows all holes arranged in a row to be inserted from bore to bore with the same center distance. It is also conceivable, however, that according to the features of claim 2, at least two, a maximum of four holes are grouped together, wherein the center distance of adjacent holes in a group is smaller than the center distance of adjacent bores of two consecutive groups.

In this context, it is then according to the features of claim 3 is advantageous that the holes in a group are connected via a central supply / discharge with a connecting pipe, which is coupled to a coolant inlet or with a coolant outlet. In this case, the inner diameter of the connecting pipe can be adjusted to the diameter of the central supply / discharge. It is also conceivable that the attachment end of the connecting pipe is deformed oval on the cooling plate. This measure should prove expedient if more than two holes are assigned to a connecting pipe.

A further embodiment of a group arrangement of holes is in the features of claim 4. Thereafter, the holes in a group are at least partially connected via oblique holes with a connection pipe, which in turn is coupled to a coolant inlet or a coolant outlet. Also in this embodiment, the oval deformation of the connecting pipe should be advantageous to detect all mouths of the oblique holes.

A preferred ratio of the diameter of the holes to the center distance between two adjacent holes is characterized in the features of claim 5. This ratio is d + 5 mm ≤ s ≤ 2d.

The thickness of the cooling plate is further reduced with the same or improved cooling effect according to claim 6, characterized in that the ratio of the thickness of the cooling plate to the diameter of the bores 1.4 to 4, preferably 1.5 to 2.7, is.

The ratio of the material thickness between a bore and the hot side to the diameter of a bore is according to claim 7 0.4 to 1.25, preferably 0.5 to 1.0.

Expressed in figures, according to claim 8, the diameter of a bore advantageously between 18 mm and 45 mm, preferably between 20 mm and 40 mm in size.

Figur 1

in schematischer Seitenansicht eine Kühlplatte für einen Schachtofen;

Figur 2

einen Horizontalschnitt durch die Darstellung der Figur 1 entlang der Linie II-II in Richtung der Pfeile IIa gesehen und

Figur 3

eine Darstellung entsprechend derjenigen der Figur 2 gemäß einer weiteren Ausführungsform.

The invention is explained in more detail with reference to exemplary embodiments illustrated in the drawings. Show it:

FIG. 1

in a schematic side view of a cooling plate for a shaft furnace;

FIG. 2

a horizontal section through the representation of Figure 1 along the line II-II seen in the direction of the arrows IIa and

FIG. 3

a representation corresponding to that of Figure 2 according to another embodiment.

1 denotes a cooling plate of a copper alloy for a shaft furnace in FIG. On the hot side 2, the cooling plate 1 alternately grooves 3 and projections 4.

The cooling plate 1 is traversed in the vertical direction by a plurality of in-line holes 5, which are made by deep hole drilling. These holes 5 are designed as blind holes. The inlet ends are closed by plugs 6.

The bores 5 are conveyed from a coolant inlet 7 via a connecting pipe 8 with a coolant, such as e.g. Water, acted upon at the lower end 9 of the cooling plate 1. The heated coolant exits at the upper end 10 of the bores 5 via a connecting pipe 11 into a coolant outlet 12.

As can be seen in a joint consideration of Figures 1 and 2, the holes 5 are each grouped together in the region of the connecting pipes 8, 11. Each group 13, 13a has three holes in the embodiment 5. The center distance s of the holes 5 in a group 13, 13a is smaller than the center distance s _{1 of} adjacent bores 5 of two consecutive groups 13, 13a sized.

The bores 5 of each group 13, 13a are connected via a central inlet / outlet 14 with a connecting pipe 8, 11. In the exemplary embodiment, the connecting pipes 8, 11 consist of a copper alloy. They have circumferentially cuffs 15 made of steel, over which they are gas-tight welded to a shaft furnace jacket. The cooling plate 1 adjacent ends 16 of the connecting pipes 8, 11 are flared and lie in recesses 17 on the cold side 18 of the cooling plate 1. The flanged ends 16 are welded via V-seams 19 with the cooling plate 1.

The ratio of the diameter d of the holes 5 to the center distance s of two adjacent holes 5 is designed as d ≦ s ≦ 3d. This ratio is preferably d + 5 mm ≦ s ≦ 2d.

The ratio of the thickness t of the cooling plate 1 - measured from the bottom of the groove - to the diameter d of the bores is between 1.4 to 4, preferably as 1.5 to 2.7.

The ratio of the material thickness r between a bore 5 and the hot side 2 in the groove bottom of the cooling plate 1 to the diameter d of a bore 5 is 0.4 to 1.25, preferably 0.5 to 1.0.

In the exemplary embodiment, the diameter d of the bores is 18 mm to 45 mm, preferably 20 mm to 40 mm.

The variant shown in Figure 3 shows, in contrast to that of Figure 2, that the holes 5 of a group 13 are connected in part via oblique holes 20 with a connecting pipe 8, 11, which in turn is coupled to a coolant inlet 7 or a coolant outlet 12. Otherwise, the embodiment of FIG. 3 corresponds to that of FIG. 2.

Instead of the crimped ends 16 of the connecting pipes 8, 11, it is also conceivable that the connecting pipes 8, 11 open straight into the cooling plate 1 and are welded by fillet welds.

Reference numerals:

1 -

cooling plate

2 -

Hot side v. 1

3 -

Grooves in 2

4 -

Projections on 2

5 -

Drilling in 1

6 -

Plug

7 -

Coolant inlet

8th -

connecting pipe

9 -

lower end v. 5

10 -

upper end v. 5

11 -

connecting pipe

12 -

Coolant outlet

13 -

Group v. 5

13a -

Group v. 5

14 -

central supply / discharge

15 -

cuffs

16-

Ends v. 8, 11

17 -

Depressions in 18

18 -

Cold side v. 1

19 -

V-seams

d -

Diameter v. 5

s -

Center distance v. 5

s ₁ -

Center distance v. 5

t -

Thickness v. 1

r -

material thickness

Claims (8)

Cooling plate of copper or a copper alloy for shaft furnaces, comprising a plurality of spaced apart and parallel to the hot side (2) extending bores (5) for a coolant, characterized in that the ratio of the diameter (d) of the bores ( 5) to the center distance (s) of two adjacent holes (5) as d ≤ s <3d is designed. Cooling plate according to claim 1, characterized in that at least two, a maximum of four holes (5) are grouped together, wherein the center distance (s) of adjacent holes (5) in a group (zB13) smaller than the center distance (s ₁ ) adjacent to each other Holes (5) of two consecutive groups (13,13a) is dimensioned. Cooling plate according to claim 2, characterized in that the bores (5) of a group (13, 13a) are connected via a central inlet / outlet (14) to a connecting pipe (8, 11) which is connected to a coolant inlet (7) or is coupled with a coolant outlet (12). Cooling plate according to claim 2, characterized in that the bores (5) of a group (13, 13a) are connected at least in part via oblique bores (20) to a connection pipe (8, 11), which in turn is connected to a coolant inlet (7) or a Coolant outlet (12) is coupled. Cooling plate according to one of claims 1 to 4, characterized in that the ratio of the diameter (d) of the holes (5) to the center distance (s) of two adjacent holes (5) as d + 5mm ≤ s ≤ 2d is designed. Cooling plate according to one of claims 1 to 5, characterized in that the ratio of the thickness (t) of the cooling plate (1) to the diameter (d) of the bores (5) 1.4 to 4.0, preferably 1.5 to 2, 7 amounts to. Cooling plate according to one of claims 1 to 6, characterized in that the ratio of the material thickness (r) between a bore (5) and the hot side (2) to the diameter (d) of a bore (5) 0.4 to 1.25, preferably 0.5 to 1.0. Cooling plate according to one of claims 1 to 7, characterized in that the diameter (d) of a bore (5) is 18 mm to 45 mm, preferably 20 mm to 40 mm.

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