EP1913322B1 - Tapping channel for a metallurgical furnace - Google Patents

Description

The invention relates to a tapping channel for a metallurgical furnace, in particular for an electric reduction furnace, comprising at least one tapping stone and a cooling device in the region of the tapping channel.

Out Patent Abstracts of Japan 05-331521 a tapping channel is known in which the cylindrical tapping channel is made by a copper-made, provided with cooling channels, casing tube. This jacket tube is inserted into a bore in the side wall of the furnace with a filling material for positioning such that the end wall of the jacket tube is flush with the inner wall of the furnace.

• Konstruktionsweise der Abstichlöcher

Die Abstichlöcher können in herkömmlicher Bauart angeboten werden. Für den Einsatz unter höheren Belastungen stehen wassergekühlte Elemente für den Abstich von Metall, CU - Stein und Schlacke zur Verfügung.In the SMS - Demag company brochure "With SAF technology to success", on page 12, left-hand nip is executed:

• Construction of the tap holes

The tap holes can be offered in conventional design. For use under higher loads, water - cooled elements are available for metal, CU - stone and slag tapping.

Furthermore, it is known that the tapping stones of the tapping channel are washed out in the lining, the wall construction is destroyed. As a result, the thermal conductivity and the tightness in the region of the tapping channel is no longer guaranteed. The damaged or worn tapping stones must be regularly repaired / replaced as the furnaces are in continuous operation. The oven must be switched off for repair / replacement. This leads to production interruptions. In order to keep these production interruptions as low as possible, the repair / replacement of the tapping channel or of the tapping stones takes place, if possible, in the Inside the stove still high temperatures are present. In this embodiment, the area around the tapping channel is not cooled. Such an embodiment is in the Figures 1 and 2 shown.

The document D1 ( DE 34 27 268 A1 ) discloses a tapping channel with a tapping stone, which is surrounded by a sleeve-shaped support member in which sensors for detecting the metal content in the melt sit. So that the electronics for the sensors can operate at an optimum ambient temperature, a cooling device is arranged in the carrier element. The support element with the electronics and the cooling device is placed directly in the wall of the furnace, so that a quick decision on the metal content in the slag can be made. Depending on the detected metal content of the tapping channel is optionally closed with a slide.

In other, known, tapping channels the tapping channels are cooled directly, the cooling medium, preferably water, is guided in the tapping channels into the interior of the oven and forwarded to the area of Ofenausmauerung. In the event of damage to the tapping channel, therefore, the cooling medium can enter the furnace.

The invention has for its object to improve the known tapping channels, in particular their stability and durability, and to avoid the above-mentioned disadvantages. With an improved design of the tapping channel also the necessary maintenance is to be simplified and the safety can be improved.

This object is achieved in that at a tapping channel according to the preamble of claim 1, the sleeve is formed in its projecting from the furnace wall to the outside region at least partially with a peripheral cooling channel.

Further embodiments of the tapping channel result from the relevant subclaims.

The decisive advantage of the tapping channel according to the invention is that the tapping stones are not surrounded by the sleeve over the entire length. The tapping stone facing the interior of the oven (in the case of multipart design) or tapping stone section (in the case of one - part tapping stone) is not surrounded by the sleeve. This tapping stone is flush with the lining of the furnace.

In the tapping channel according to the invention, the cooling medium is passed only from the outside in or on the sleeve made of copper. The tapping channel is cooled indirectly, due to the high thermal conductivity of the copper sleeve. No cooling medium is conducted into the interior of the oven, since the cooling channels in the sleeve are located only outside the furnace shell.

Through the sleeve, the natural leaching by hot slag / metal, etc. are minimized and the tapping channel is retained in the preconfigured form.

Furthermore, the position / position of the tap hole is defined. The lining around the tap hole remains intact. The used / worn tapping stones can be easily removed.

The cooling device according to the invention, the sleeve, enables easy / easy installation of the new tapping stones, whereby inexpensive standard stone formats can be used.

Through the sleeve intensive cooling takes place into the interior of the oven, which allows the melt to solidify faster and allows faster and safer access to the taphole. The indicated improvements avoid or reduce the oven downtime.

Fig. 1

in geschnittener Seitenansicht einen Abstichkanal in bekannter Ausführung,

Fig. 2

in geschnittener Draufsicht den Abstichkanal aus Fig.1,

Fig. 3

in geschnittener Seitenansicht einen erfindungsgemäßen Abstichkanal und

Fig. 4

in geschnittener Draufsicht den Abstichkanal aus Fig. 3.

An embodiment of the invention and the prior art will be described with reference to very schematic drawings. Show it:

Fig. 1

in a sectional side view of a tapping channel in a known design,

Fig. 2

in cut plan view of the tapping channel Fig.1 .

Fig. 3

in a sectional side view of a tapping channel according to the invention and

Fig. 4

in cut plan view of the tapping channel Fig. 3 ,

In FIG. 1 a tapping channel 1 is shown in a known embodiment, which is arranged in a taphole 2 of a furnace consisting of furnace wall 3 and lining 4.

In FIG. 2 is the tapping channel 1 off FIG. 1 to see in cut plan view. In the embodiment shown, the tapping channel 1 consists of several tapping stones 5, 6, 7, 8. The tapping stone 1 points towards the interior of the furnace and the tapping stones 7, 8 are located outside the furnace wall 3 and are of a sheet metal construction 9 Surrounded by stabilization.

FIG. 3 shows the tapping channel 1 according to the invention in a sectional side view. Three tapping stones 10, 11, 12 are arranged in a tapping hole 2, wherein the tapping stone 10 pointing into the interior of the furnace terminates flush with the lining 4 of the furnace. The outer tapping stone 12 facing away from the furnace projects beyond the furnace wall 3 of the furnace. For this purpose, a projection 13 is attached to the furnace wall to support the tapping stone 12. In the region of the furnace wall 3, the tapping stones 11, 12 are surrounded by a cooling device in the form of a sleeve 14. The sleeve 14 is flush with the end face of the tapping stone 12 on the outside of the furnace. The sleeve 14 protrudes partially into the lining 4 of the furnace. As shown, the direct area on the furnace inner wall is not included by the sleeve 14. For example, the last tapping stone 10 pointing into the interior of the oven is not enclosed by the sleeve.

In FIG. 4 the tapping channel 1 is shown in a sectional plan view. The sleeve 14, which consists for example of solid copper, is in their from the Furnace wall 3 outwardly projecting region with a cooling channel 15 which is annular in the embodiment shown. On the side walls of the sleeve 14 ports 16, 17 are provided for the cooling water supply and the cooling water discharge.

LIST OF REFERENCE NUMBERS

1.

tapping channel

Second

tap hole

Third

furnace wall

4th

lining

5th

Tapping - stone

6th

Racking Stone

7th

Tapping - stone

8th.

Tapping - stone

9th

sheet metal construction

10th

Tapping - stone

11th

Tapping - stone

12th

Tapping - stone

13th

approach

14th

shell

15th

cooling channel

16th

connection

17th

connection

Claims (7)

1. Tapping channel (1) for a metallurgical furnace, consisting of at least one tapping block (10, 11, 12) and a cooling device, which is constructed as a sleeve (14), in the region of the furnace wall (3), wherein the sleeve (14) at least partly encloses the tapping block (10, 11, 12) so as to indirectly cool the tapping block, wherein the sleeve (14) is made from a material with high heat conductivity, characterised in that the sleeve (14) is constructed with an encircling cooling channel (15) at least in an area in its region protruding outwardly from the furnace wall (3).
2. Tapping channel (1) according to claim 1, characterised in that the sleeve (14) is made of copper.
3. Tapping channel according to claim 1 or 2, characterised in that the sleeve (14) is of single-part construction.
4. Tapping channel according to claim 1 or 2, characterised in that the sleeve (14) is of multi-part construction.
5. Tapping channel (1) according to claim 1, characterised in that the sleeve (14) is constructed with connections (16, 17) for the feed and discharge of a coolant.
6. Tapping channel (1) according to claim 1 or 6, characterised in that the sleeve (14) is constructed to partly project into the lining (4) of the furnace.
7. Tapping channel (1) according to one of claims 6 and 7, characterised in that the sleeve (14) is constructed at the outer side of the furnace to be flush with the end face of the tapping block (12).

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