EP0816515B1 - Cooling plate for metallurgical furnaces of the iron and steel industry - Google Patents

Description

The invention relates to a cooling plate for with a refractory lined furnaces, Direct reduction reactors and melter gasifiers Iron and steel industry consisting of cast Copper or a low-alloy copper alloy coolant channels arranged in their interior.

Such copper cooling plates are usually between the furnace jacket and the furnace lining and to the cooling system of the metallurgical furnace connected. On the inside facing the oven The cooling elements in blast furnaces are largely included provided with fireproof material for steel melting furnaces the copper cooling elements, however, are in the upper part of the furnace over the fireproof lining.

Cast copper plates are known in which the Cooling channels are formed by cast steel pipes. An oxide layer hinders the cast-in steel pipes as well as an insufficient connection a uniform between the steel tube and copper plate Heat dissipation.

A cooling plate is known from DE 29 07 511 C2, from a forged or rolled ingot is made and where the cooling channels run vertically Blind holes are, which by mechanical Deep drilling are introduced. The target position of the holes according to height and side is adhered to exactly and thereby ensures even heat dissipation.

The cooling plate is facing the inside of the oven Side with webs and grooves and can with refractory stones or with a refractory Ramming compound lined.

EP 0 705 906 A1 describes one of a forged or rolled copper blank Cooling plate known for cooling the edge zones in addition to the vertical blind holes Cooling channels are introduced, which as vertical or horizontal blind bores of smaller diameter around the vertically arranged blind holes in the edges be introduced.

GB 1 386 645 describes a method for producing a metallic cooling element known with one or more internal cooling channels. To do this liquid metal, for example copper, poured into a mold and then are preformed cooling channel pipes made of the same material into the melt immersed to melt near the surface and with the solidifying To weld the cast product.

DT 2 313 320 describes a by casting around at least one pipe Metal molded casting used for heat transfer between the casting and serves a medium flowing through the pipe. The tube can be made of stainless steel Steel or nickel-copper exist; is the metal poured around the pipe a copper alloy.

From the previously unpublished DE patent application P 195 45 048.5-24 is one from a forged or Rolled copper ingot with cooling plate vertical blind holes known with double-sided vertical and horizontal Side flanges are equipped. Because of the overlap and connection of the vertical side flanges can circumferential cooling ring within a metallurgical Furnace are formed.

By overlapping and connecting the horizontal Side flanges can be arranged one above the other Cooling rings or individual one above the other Cooling plates are connected to each other.

From the previously unpublished DE P 195 45 984.9 one from a forged or rolled Manufactured copper blank block known in the upper part of a melting furnace, in particular Arc furnace is used and its smooth or flat inside thanks to no fire-resistant lining is protected.

The object of the invention is therefore a Copper cooling plate to create the high thermal conductivity good customization options to different institutions to be protected, such as furnaces, direct reduction reactors and melters, guaranteed.

The task is solved in the way it is in the claims are specified.

It will be made of cast copper Cooling plate prefabricated curved cooling pipes or Coolant channels, consisting of copper pipes, Copper pipe bends and copper pipe lugs, cast in.

According to the width of the cooling plate, pipes are in several rows next to each other and / or one above the other arranged. The hairpin - shaped sides of the head Cooling channels are formed either by curved ones Pipes or through pipe bends or reversing caps. The Einund Spouts are provided with pipe lugs. The complete pipeline is welded and then for tightness by means of a pressure test of approx. 15 bar / 20 minute checked.

The pipes, pipe bends and pipe lugs must, however be thick-walled than commercially available pipes, because after the cast, they are raised for several hours Exposed to temperature in the mold are.

The completely prefabricated pipeline is in the Mold inserted, fixed in the lower case and then with poured over the copper melt so that the pipeline after the melt solidifies in the copper plate is embedded.

When pouring copper over the pipeline a slight melting of the thick-walled pipes reached the pipe wall. By melting in Pipe wall area creates a close bond between Pipe and copper casting. This will make a flawless Guaranteed heat dissipation.

The flow and the flow rate of the Cooling medium is through the rounded piping compared to the angular transitions in the drilled cooling channels of a forged or rolled plate improved and harmonized.

For the use of the cast cooling plates in the blast furnace are on the wall facing the inside of the stove Cooling plate bars and grooves for holding refractory material required, which is either cast directly or by mechanical processing from a smooth wall can be worked out.

For copper cooling plates for use in an arc furnace the inside of the plate is expedient smooth or flat because of the inside is not provided with a fire-resistant lining.

To the cooling plates to a circumferential cooling ring to put together are bilateral vertical side flanges provided.

In the event that several cooling rings one above the other in a metallurgical furnace can be arranged the cooling plates also with horizontal side flanges be provided.

The invention is based on schematic Exemplary embodiments explained in more detail.

Fig. 1

einen Längsschnitt durch eine Kühlplatte für einen Einsatz in einen Hochofen,

Fig. 2

einen Querschnitt von Fig. 1,

Fig. 3

einen Längsschnitt durch eine Kühlplatte für einen Einsatz in einen Lichtbogenofen,

Fig. 4

einen Querschnitt von Fig. 3,

Fig. 5

einen Längsschnitt durch eine Kühlplatte mit vertikalen und horizontalen Seitenflanschen,

Fig. 6

einen Längsschnitt durch eine Kühlplatte mit vertikalen Seitenflanschen.

Show it:

Fig. 1

a longitudinal section through a cooling plate for use in a blast furnace,

Fig. 2

2 shows a cross section from FIG. 1,

Fig. 3

a longitudinal section through a cooling plate for use in an arc furnace,

Fig. 4

3 shows a cross section from FIG. 3,

Fig. 5

a longitudinal section through a cooling plate with vertical and horizontal side flanges,

Fig. 6

a longitudinal section through a cooling plate with vertical side flanges.

Fig. 1 shows a longitudinal section through the cooling plate (1) with, for example, four vertically arranged cooling pipes (2, 3, 4) inside the cooling plate (1) as well as recesses made in the outer wall (6) (12).

The supply of cooling water to the pipes (3) takes place from below via the coolant supply lines of the blast furnace connected pipe approaches (2). The coolant lines (2, 3, 4) of the cooling plate (1) are used as separate cooling circuits to the cooling system connected to the blast furnace.

Fig. 2 shows a section through the cooling plate (1) the vertically arranged coolant lines (2, 3, 4) on the inner wall (5) with webs (7) and grooves (8) and on the outer wall (6) with a recess (12) are provided, in which a trunnion (11) of the blast furnace (10) engages.

Fig. 3 shows a longitudinal section through a cooling plate (1) Intended for use in an arc furnace is provided.

The coolant lines (3, 4) are arranged in a serpentine shape and have only two copper pipe lugs (2) for the supply or removal of the cooling water. The copper pipes (3) and copper pipe bends (4) are before Casting of the cooling plate has been welded together, the same applies to the two copper pipe approaches (2).

Fig. 4 shows a cross section through a cooling plate (1), the inner wall (5) of which is a flat surface (9) having. The cooling water supply or cooling water discharge through the coolant lines (3, 4) takes place over two Copper pipe lugs (2) on the outer wall (6) are attached and connected to the cooling water circuit of the Arc furnace can be connected.

5 and 6 show longitudinal sections through two cooling plates (1) compared to the embodiment according to FIG. 1 with vertical (13) and horizontal side flanges (14) or according to FIG. 6 only with vertical Side flanges (13) are equipped.

Both cooling plates (1) have four vertically inside arranged cooling pipes (2, 3, 4) and recesses (12) on the outer wall (6).

List of reference numerals:

1

cooling plate

2

Copper pipe approaches

3

Copper pipe in 1st

4

Copper Elbows

5

inner wall

6

outer wall

7

Stege

8th

groove

9

flat surface

10

Blast furnace tank

11

Trunnion on 10

12

recess

13

vertical side flange

14

horizontal side flange

Claims (1)

1. Cooling plate for a blast furnace provided with a refractory lining, direct-reduction reactors and melt-down gasifiers of the iron and steel industry, consisting of cast copper or a low-alloy copper alloy with coolant channels arranged in its interior, wherein prefabricated coolant channels consisting either of copper pipe attachments (2), copper pipe ducts (3) and copper elbows (4) or of bent copper pipes are cast into the cooling plate (1), characterised in that the wall (5), which faces the furnace interior, of the cooling plate (1) has webs (7) and grooves (8) or a flat surface (9) and that the cooling plate (1) is provided at both sides with vertical side flanges (13) and/or at both sides with horizontal side flanges (14).

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