WO2019185728A1

WO2019185728A1 - Pneumatic slag stopper

Info

Publication number: WO2019185728A1
Application number: PCT/EP2019/057741
Authority: WO
Inventors: Johannes Rosner; Paul Georg Oberhumer; Bernhard VORABERGER; Erich Stefan Wimmer; Dzevad Smajic; Dominik Straßer
Original assignee: Primetals Technologies Austria GmbH
Priority date: 2018-03-29
Filing date: 2019-03-27
Publication date: 2019-10-03
Also published as: JP2021516751A; CN111902548A; EP3775294A1; JP7071530B2; KR20200138233A; EP3546599A1

Abstract

The invention relates to a pneumatic slag stopper for pneumatically sealing a tap hole channel (18) of a metallurgical vessel in relation to an outlet of slag by means of at least one gas flow introduced from at least one gas outlet opening (20) into the tap hole channel (18), wherein the gas outlet opening (19) is attached to a pivot arm (13), which can pivot about a pivot axis (15) by means of a pivot drive, and the pivot arm (13) has a gas supply channel (23) feeding into the at least one gas outlet opening (20). The longitudinal axis (14) of the at least one gas outlet opening (19) is substantially parallel to the pivot axis (15). The invention also relates to a metallurgical vessel having a tap hole channel and a slag stopper according to the invention secured to the metallurgical vessel, wherein the longitudinal axis of the tap hole channel is substantially parallel to the pivot axis. In the method for pneumatically sealing a tap hole channel of a metallurgical vessel in relation to the outlet of slag by means of a gas flow provided from at least one gas outlet opening, the gas outlet opening attached to a pivot arm is positioned in front of the tap hole (24) of the tap hole channel in a sealing position, in which the pivot arm is pivoted with a pivoting movement into the sealing position in front of the tap hole (24), wherein the pivoting movement occurs in a plane substantially perpendicular to the longitudinal axis of the tap hole channel (18).

Description

Pneumatic slag stopper

Field of engineering

The application relates to a pneumatic slag stopper for pneumatically closing a taphole channel of a metallurgical vessel with respect to the discharge of slag by means of at least one of at least one

Gas outlet opening in the taphole channel introduced gas stream, and a method for pneumatic

Closing a taphole channel.

State of the art

In metallurgical processing steps of molten metals, liquid slags, which have a lower density than the liquid ones, are formed in addition to liquid metal products

Have metal products. When removing the liquid

Metal products from the metallurgical vessels, in which the processing steps were carried out, it can for

Get carried away by slag. This is undesirable, it is as complete as possible separation of slag and

Aimed at metal product. It is known one

Taphole channel of a metallurgical vessel to

close as soon as the proportion of slag in the

outflowing fluid stream becomes unacceptably high. Such a method is based for example on pneumatic closing of the taphole channel by blowing gas. Such a method is described for example in DE2639712.

Devices for carrying out such a method are usually attached to the metallurgical vessel and therefore exposed to extreme environmental conditions. Their lifetime is limited, maintenance and replacement often need to be done. To successfully perform pneumatic closing, the gas should be injected as symmetrically as possible with respect to the taphole channel. The position of slag stopper Devices should be adjusted accordingly. That makes

Maintenance and replacement laborious. From AT408965B a device is known which replacement and maintenance

simplified due to the design. However, by the principle of DE2639712 corresponding type

Rotational outer contour of the metallurgical vessel enlarged. Any resulting space problems in the vicinity of existing metallurgical vessels may limit the usability.

Summary of the invention

Technical task

It is the object of the present invention to provide a

pneumatic slag stopper and a method for pneumatically closing a taphole channel

to provide that over the prior art

allow extended usability.

Technical solution

This task is solved by a

pneumatic slag stopper for pneumatic closing of a

Taphole channel of a metallurgical vessel with respect to the discharge of slag

by means of at least one

from at least one gas outlet opening

introduced into the taphole channel

Gas stream,

wherein the gas outlet opening is attached to a pivot arm, which is pivotable about a pivot axis by means of a pivot drive, and the pivot arm has a gas supply channel opening into the at least one gas outlet opening, which is characterized

that the longitudinal axis of the at least one gas outlet opening is substantially parallel to the pivot axis. Slag or slag entraining stream of molten metal passes through the tap hole - or at the end of the tap hole - from. The pneumatic slag stopper closes the

Taphole - - or the tap hole at the end - of a metallurgical vessel with respect to the discharge of slag - the tap hole at the end of the tap hole is thus open when the gas stream, the discharge of slag or a slag entraining stream of

Molten metal stops. This is a gas stream in the

Taphole - or the tap hole at the end of the tap hole - introduced. The gas flows from at least one gas outlet opening against the

Flow direction of the slag or a slag entraining stream of molten metal in the

Taphole channel and closes it practically with respect to the discharge of slag.

The taphole channel is suitable for stopping slag or a slag of entraining stream of molten metal due to the gas flowing out of the gas outlet opening. A gas supply device comprising the gas supply channel and the at least one gas outlet opening is suitable, through a taphole channel - or a

Taphole - flowing slag - or a slag entraining streams of molten metal - to stop. The taphole passage runs through the wall of the

metallurgical vessel. Through the taphole channel, the molten metal is discharged from the metallurgical vessel. The taphole channel terminates at the outside of the metallurgical vessel with the taphole. The taphole is in the so-called Abstichlochbrille, a perpendicular to the longitudinal axis of the taphole channel plate.

The metallurgical vessel is for example a

Steel mill converter, for example for a BOF or an LD process.

The gas outlet opening is attached to a pivot arm, since it is only then to be positioned in front of the tap hole, if slag leakage threatens. Until then, she should be in a different position. When the time comes, she should be able to be positioned quickly in front of the tap hole. This is achieved by using a swivel arm

is attached, which is pivotable about a pivot axis by means of a pivot drive.

The gas outlet opening is attached to a pivot arm, which is pivotable about a pivot axis by means of a pivot drive,

and the swing arm into the at least one

Has gas outlet opening gas supply channel, characterized in that

the longitudinal axis of the at least one gas outlet opening is substantially parallel to the pivot axis,

and the swivel arm with a pivoting movement in a plane substantially perpendicular to the pivot axis

(is pivotable.

The swivel arm is by means of the pivot drive to the

Swivel axis pivotable in a sealing position.

He is pivotable with a pivoting movement in a largely perpendicular to the pivot axis plane in the sealing position.

Preference is given to the sealing position - if necessary from a

Starting position of the swivel arm - only by one

Pivoting movement achieved - the swinging motion is thus added no further movement.

There must be at least a single gas outlet opening, but it can also be present more gas outlet openings.

The pivot arm has a in the at least one

Gas outlet opening gas supply channel opening. Through this gas supply channel is the pneumatic closing necessary gas supplied to the gas outlet. The guide in the swivel arm makes it compact and easy to build. According to the invention, the longitudinal axis of the gas outlet opening is largely parallel to the pivot axis. Being largely parallel includes both parallel and deviation from

Parallelism up to a deviation of +/- 5 °, such

minor deviations from parallelism can occur during operation without restricting functionality to an unacceptable extent. Deviation of +/- 5 ° refers to an angle between the longitudinal axis of the gas outlet opening and the pivot axis in a plane containing both axes as it descends

Parallel shifts would be arranged intersecting.

In such a construction is at installation of the

Slag stopper on a metallurgical vessel

Rotational outer contour compared to DE2639712 reduced.

Advantageous Effects of the Invention

Preferably, the distance of the gas outlet opening of the pivot axis is adjustable. This can be realized, for example, in that a component of a certain length serving as a swivel arm and connected to the swivel drive moves into different positions with respect to the axis of rotation

is adjustable. This will adjust the

Gas outlet opening with respect to the tap hole - for example after replacement of the taphole channel -, made easier, and installation on the metallurgical vessel and maintenance of the slag stopper made less expensive. For slag stoppers according to AT408965B, the entire

Slag stopper can be adjusted with housing on the metallurgical vessel, which is much more complex. Of the

Slag stopper according to the invention thus offers comparatively reduced assembly times and costs. The swivel arm is pivotable from a home position to a maximum swivel angle. Preferably, the maximum swing angle is adjustable. That can

For example, done by the rotary drive an adjustable stop element to limit the

Pivoting movement is appropriate.

As a result, the adjustment of the gas outlet opening is facilitated with respect to the tap hole, which installation on

metallurgical vessel, maintenance and replacement of the

Cinder stopper makes less effort.

The swivel arm preferably comprises at least one arm module and at least one gas outlet module,

wherein the gas outlet module

which contains at least one gas outlet opening,

and

- Is releasably secured to the arm module.

Such a modular construction of the swivel arm is easier to produce and causes less effort during maintenance, as for example, possibly only the

Gas outlet module must be renewed.

According to an advantageous embodiment, a plurality of gas outlet openings are present. This may have advantages in terms of the flow behavior of the gas stream after leaving the slag stopper. In pneumatic

Closing a taphole channel, the better the results of preventing the discharge of slag, the better the gas flow coaxial with the

Longitudinal axis of the taphole channel in the taphole

initiate. If a plurality of gas outlet openings are provided, they may have comparatively smaller cross-sections with the same overall cross-sectional area as a single, larger gas outlet opening. For very cramped

Space can be the realizable length for

Gas outlet openings be very short. This can lead to the gas flow at the outlet - for example, due to strong one-sided pressure loss in a change in the Flow direction when passing from the gas supply channel into the gas outlet opening - with respect to a longitudinal axis of the

Gas outlet is deflected, and therefore coaxial

Introduction in the taphole channel is difficult, although the longitudinal axis of the taphole and longitudinal axis of the

Gas outlet opening are coaxial. The result of inhibiting the discharge of slag can thereby

be suboptimal. In addition, the exit of a

deflected gas stream to unwanted noise emissions.

Although the gas flow through the same

Total cross-sectional area, but by a variety of

Gas outlet openings exits with smaller cross sections, he will be relatively less distracted. Accordingly, it becomes easier to coaxially into the taphole channel

the discharge of slag is getting better

stopped, and there will be less noise emissions.

According to an advantageous embodiment, the are

Gas outlet or the gas outlet openings as

Gas duct or as gas channels in a nozzle head element, which in the swivel arm or in the

Gas outlet module can be used. This makes it possible, if appropriate, to use different geometries of the gas outlet openings in a simple manner or to react to changed boundary conditions of the problem to be solved, or to carry out wear-related replacement. There may be a single nozzle head element, or a plurality of nozzle head elements.

According to an advantageous embodiment, the position of the nozzle head element is adjustable by means of adjusting elements. For example, with regard to the angle of the longitudinal axes of the gas outlet openings with respect to the pivot axis. The

Adjustment can be, for example, screws. Due to the adjustability can - as above

described aspired coaxiality of the gas flow with the longitudinal axis of the taphole channel are realized rather than with non-adjustable nozzle head elements. The position of the swivel arm, the pneumatic

Sealing a taphole channel of a metallurgical vessel with respect to the discharge of slag is also known as sealing position. The pivot axis passes through a pivot shaft. The slag stopper is provided with a gas source line for supplying the gas supply channel with gas.

According to an advantageous embodiment variant, the gas source conduit is valveless connected to the gas supply channel at least via a connecting channel arranged eccentrically in the pivot shaft only in the sealing position.

Optionally, also further connection channels may be present outside the pivot shaft to introduce the gas from the connecting channel in the pivot shaft in the gas supply channel.

A valveless design reduces susceptibility to failure and maintenance. The end opening of the gas source line and the gas source line side opening of the arranged in the pivot shaft connecting channel overlap only in

Sealing position, accordingly only the gas flows. In the starting position no gas flow is possible because the

Swivel shaft closes the gas source line.

During the movement into the sealing position and during the pneumatic closing of the taphole channel, splashes of molten metal or slag may freeze on the pivoting arm. This can adversely affect the pivotal movement and the introduction of the gas flow into the taphole channel. According to an advantageous embodiment, in the vicinity of the at least one gas outlet opening in the pivot arm, preferably in the gas outlet module, a plurality of gas outlets

available. The gas outlets are arranged away from the region in which the gas outlet opening or the gas outlet openings are arranged. Under the environment is the area of the swivel arm or the

Gas outlet module to understand that in

Seal position located in front of the taphole glasses. By the gas outlets emit gas, which is supplied, for example, through the gas supply channel when the gas outlets open into the gas supply channel. The fact that the surface is reduced by the gas outlets, a freezing of

Molten metal or slag difficult. By running out of gas gas freezing of molten metal or slag is difficult. The gas outlets thus contribute to reducing the above-mentioned problems.

According to an advantageous embodiment of the is

Part-turn actuator gearless. This reduces manufacturing costs, susceptibility to failure and maintenance under the extreme environmental conditions that a slag stopper attached to a metallurgical vessel has to endure.

According to an advantageous embodiment, the pivot drive comprises at least one crankshaft and at least one pneumatic cylinder for driving the crankshaft. This reduces the susceptibility to failure and maintenance under the extreme environmental conditions that a slag stopper attached to a metallurgical vessel has to endure.

According to an advantageous embodiment of the is

Part-turn actuator in a thermally insulated housing

accommodated. This reduces susceptibility to interference and

Maintenance under the extreme environmental conditions that a slag stopper attached to a metallurgical vessel has to endure. Especially the life of a

Pneumatic cylinder is thereby increased.

A further subject of the present application is a metallurgical vessel having a taphole channel and a slag stopper according to the invention attached to the metallurgical vessel, wherein the longitudinal axis of the taphole channel is substantially parallel to the pivot axis. In a slag stopper according to the invention thus installed, the advantages described above result. The slag stopper may be attached directly or indirectly to the metallurgical vessel. Preferably, it is releasably secured.

The attachment to the metallurgical vessel can

for example, indirectly via a located on the metallurgical vessel console. For example, consoles used for AT408965B slagstoppers can also be used for the slag stopper according to the invention. This allows easy conversion of

Slag stopper according to AT408965B on the slag stopper according to the invention. In such a case, those at the

existing console existing connections for

Supply lines can be used unchanged by appropriate construction of the slag stopper.

The slag stopper according to the invention may, of course, analogously to the teaching of AT408965B have a frame which carries the parts of the slag stopper, which in turn the parts of the slag stopper supporting frame is releasably secured to the metallurgical vessel.

Another object of the present application is a method for pneumatically closing a

Abstichlochkanals a metallurgical vessel with respect to the discharge of slag by means of a gas stream provided from at least one gas outlet opening, wherein the at least one mounted on a pivot arm

Gas outlet opening is positioned in a sealing position before the tap hole of the taphole channel, characterized

characterized in that in addition the swivel arm with a

Pivoting movement is pivoted in the sealing position in front of the taphole, wherein the pivoting movement takes place in a plane substantially perpendicular to the longitudinal axis of the taphole channel.

In known slag stoppers as in DE2639712 and

AT408965B shown, the pivot arm is pivoted in front of the tap hole, that the distance between the

Gas outlet and taphole along the longitudinal axis the taphole channel seen until reaching the

Sealing position reduced.

The pivoting movement takes place in a plane in which the longitudinal axis of the taphole channel is located. The

Gas outlet opening approaches the taphole in the direction of the longitudinal axis of the taphole seen practically from the front.

In contrast, the invention pivots so that the pivoting movement in a longitudinal axis of the

Tapping hole channel largely perpendicular plane takes place. The gas outlet opening approaches the taphole or the longitudinal axis of the taphole channel

practically from the side.

With largely perpendicular includes both vertical and deviation from perpendicular to up to a deviation of +/- 5 °, such slight deviations from the orthogonality can result in operation, without limiting the functionality to an unacceptable extent

In such a procedure, less space outside the rotational outer contour of the metallurgical vessel is required for a slag stopper attached to the metallurgical vessel to facilitate pivotal movement than in DE2639712 and AT408965B. Thus, the use is also possible in cases where operation of slag stoppers according to DE2639712 and AT408965B due to cramped

Space between tapping hole and ladle is not feasible.

The gas outlet is in front of the tap hole in Abstichlochbrille - ie outside the metallurgical

Vessel - positioned for example at a distance of 30 - 100 mm. The gas outlet opening is oriented in the direction of taphole.

In the sealing position are the longitudinal axis of the

Taphole and the longitudinal axis of the gas stream preferably substantially coaxially. For optimal pneumatic

Closing a taphole channel is a central, with respect to the edges of the taphole symmetrical introduction of such gas flow important.

If only one gas outlet opening is present, it is preferably positioned centrally in front of the taphole - longitudinal axis of the taphole channel and the longitudinal axis of the

Gas outlet are substantially coaxial. A gas flow emerging from the gas outlet opening whose longitudinal axis is substantially coaxial to the longitudinal axis of the

Gas outlet opening is then will also be substantially coaxial with the longitudinal axis of the taphole channel.

If multiple gas exit openings are present, they are preferably positioned centrally in front of the taphole such that the gas flow is substantially coaxial with the longitudinal axis of the taphole channel.

Since the pivoting arm inevitably has to enter the flow of molten metal and / or slag flowing out of the taphole during the pivoting movement, before the taphole channel can be pneumatically closed, the liquid material sprays in directions away from the longitudinal axis of the

Abstichlochkanals. On hit by the splashes

Parts of the system can freeze the splashes, it speaks of extenuations. Extensions also occur at the slag stopper and in the vicinity of the tap hole, for example at the

Taphole glasses, on. The solid verbs can

Problems in positioning the gas outlet opening prepare, for example, because they restrict pivotal movement before reaching the intended sealing position. For example, at the tap hole so-called trumpets are formed from verbations, which in conventional process control in each case

Tapping process grow.

Compared to DE2639712 and AT408965B is at

inventive process the risk that

Explanations the planned positioning of the

Hinder gas outlet, reduced. This is because, for example, in a previous

Tapping partially trained trumpets are pushed away and knocked off in the lateral approach of the swing arm. The maintenance effort is thereby reduces and obstructive problems in pneumatic closing reduced.

According to a preferred embodiment, during the pneumatic closing of the taphole channel, gas flows from a plurality of gas outlets in the vicinity of the at least one gas outlet opening in the swivel arm. This prevents fermentation around the gas outlet.

Another object of the present application is a signal processing device with a machine-readable program code, characterized in that it has control commands for performing a method according to the invention.

Another object of the present application is a machine-readable program code for a

Signal processing device, characterized in that the program code has control commands, which the

Have signal processing device for performing a method according to the invention.

Another object of the present application is a storage medium with a stored thereon

Machine-readable program code according to the invention.

Brief description of the drawings.

Hereinafter, the present invention is based on

schematic exemplary figures of embodiments described.

Figures 1 and 2 show conventional pneumatic

Closing a taphole channel. Figures 3 and 4 show an embodiment of a pneumatic slag stopper according to the invention in

Starting position in different views.

FIG. 5 shows a section through an embodiment of a swivel arm according to the invention.

FIG. 6 shows an embodiment of a device according to the invention in a view largely analogous to FIGS. 3 and 4

pneumatic slag stopper in sealing position.

FIG. 7 schematically shows a swivel arm with arm module and gas outlet module.

FIG. 8 shows a gas outlet module with nozzle head element and gas outlet openings.

Figures 9a and 9b show schematically an embodiment of valveless gas supply of the gas supply channel.

Description of the embodiments

Examples

Figures 1 and 2 show pneumatic closing of the

Taphole channel according to DE2639712. From the metallurgical vessel 1, in this case a steelworks converter, metal melt 2 flows through the taphole channel 3 during tapping. The

Tap hole 4 is located in the taphole glasses. 5

Shown is a starting position, because slag 6 does not come out yet. On a swing arm 7 is a

Gas outlet opening 8 attached. The pivot arm 7 is pivotable about a pivot axis 9 by means of a pivot drive 10. The longitudinal axis 11 of the gas outlet opening 8 in the

Paper plane is perpendicular to the pivot axis 9. In Figure 2, a sealing position is shown by means of

Quarter turn actuator 10 was taken. The longitudinal axis 11 of the gas outlet opening 8 in the plane of the paper is coaxial with the longitudinal axis of the taphole channel 3. The gas outlet opening 8 is located in the taphole 4 in the taphole glasses. 5

From the gas outlet opening 8 flows to the pneumatic

Close gas in the taphole channel 3, represented by an arrow. This gas stream also breaks through the annular gap 12 positioned centrally around the taphole 4

Gas outlet opening 3 with air, represented by arrows.

FIG. 3 shows a pneumatic according to the invention

Slag stopper. The pivot arm 13 has at its end a gas outlet opening. Not shown is a running in the pivot arm 13 gas supply channel. The indicated longitudinal axis 14 of the gas outlet opening is parallel to

Swivel axis 15. The swivel drive is within the

Housing 16 arranged and not shown separately. The housing 16 may be thermally insulated.

FIG. 4 shows another view of that in FIG. 3

presented facts.

In both Figures 3 and 4, a taphole glasses 17 is shown with taphole of a metallurgical vessel to which the slag stopper according to the invention is mounted. The longitudinal axis 18 of the taphole channel behind the taphole is substantially parallel to the pivot axis 15th

Figure 5 shows schematically in a sectional view the ratio of the longitudinal axis 20 of a gas outlet opening 19 in a pivot arm 21 to the pivot axis 22. In the pivot arm 21 extends a gas supply channel 23 which in the

Gas outlet 19 opens.

In Figures 3 and 4, the slag stopper is in an initial position. Figure 6 shows him in analog

Representation in a sealing position after it has been pivoted in a longitudinal axis 18 of the taphole 24 largely perpendicular plane. In the sealing position, the gas outlet opening in front of the tap hole 24th

positioned.

Figure 7 shows schematically in sectional view a portion of a pivot arm 25, the arm module 26 and a Gas outlet module 27 includes, which is releasably secured to the arm module 26.

Figure 8 shows schematically in sectional view a in the

Gas outlet module 28 inserted nozzle head element 29 with a plurality of gas channels 30a, 30b, 30c as gas outlet openings. Further gas outlet openings in the nozzle head element 29 are indicated, but not provided with reference numerals. In the environment of the gas outlet openings are optionally available

Gas outlets 31a, 31b, 31c shown; further gas outlets in the nozzle head element 29 are indicated, but not with

Provided with reference numerals.

FIG. 9a shows schematically how in the sealing position a gas source conduit 32 is valvelessly connected to the gas supply channel 36 in the pivoting arm 37 via a connecting channel 34 arranged eccentrically to the pivot axis 33 in the pivot shaft 35.

FIG. 9b shows diagrammatically how, in a position given by about 135 ° in comparison to FIG. 9a

Connecting channel 34 no longer communicates with the gas source line 32.

List of reference numbers

1 Metallurgical vessel

2 molten metal

3 taphole channel

4 tap hole

5 taphole glasses

6 slag

7 swivel arm

8 gas outlet

9 pivot axis

10 quarter turn actuator

11 longitudinal axis of

Gas outlet

12 annular gap

13 swivel arm

14 longitudinal axis of

Gas outlet

15 pivot axis

16 housing

17 taphole glasses

18 taphole channel

19 gas outlet

20 longitudinal axis of a

Gas outlet

21 swivel arm

22 pivot axis

23 gas supply channel

24 tap hole

25 swivel arm

26 arm module

27 gas outlet module

28 gas outlet module 29 nozzle head

30a, 30b, 30c gas channels

31a, 31b, 31c gas outlets

32 gas source line

33 pivot axis connecting channel

pivot shaft

Gas supply channel

swivel arm

List of references Patent Literature AT408965B

DE2639712

Claims

claims

1) Pneumatic slag stopper for pneumatic

Closing a taphole channel (18) of a

metallurgical vessel with respect to leakage of slag by means of at least one of at least one

Gas outlet opening (20) in the taphole channel (18) introduced gas stream,

wherein the gas outlet opening (19) is attached to a pivot arm (13) which is pivotable about a pivot axis (15) by means of a pivot drive,

and the pivot arm (13) into the at least one

Has gas outlet opening (20) opening gas supply channel (23),

characterized in that

the longitudinal axis (14) of the at least one gas outlet opening (19) is substantially parallel to the pivot axis (15).

2) Pneumatic slag stopper according to claim 1, characterized in that the distance of the gas outlet opening (19) of the pivot axis (15) is adjustable.

3) Pneumatic slag stopper according to claim 1 or 2, characterized in that the maximum pivot angle is adjustable.

4) Pneumatic slag stopper according to one of claims 1 to 3, characterized in that the swivel arm (25) at least one arm module (26) and at least one

Gas outlet module (27) comprises,

the gas outlet module (27)

which contains at least one gas outlet opening,

and

- Is releasably secured to the arm module (26).

5) Pneumatic slag stopper according to one of claims 1 to 4, characterized in that a plurality

Gas outlet openings are present. 6) Pneumatic slag stopper according to one of claims 1 to 5, characterized in that

the gas outlet opening or the gas outlet openings as a gas channel or as gas channels (30a, 30b, 30c))

in a nozzle head element (29)

are executed,

which can be inserted into the swivel arm or into the gas outlet module (28).

7) Pneumatic slag stopper according to claim 6, characterized in that the position of the nozzle head element (29) is adjustable by means of adjusting elements.

8) Pneumatic slag stopper according to one of claims 1 to 7, characterized in that only in sealing position, the gas source line (32) valveless at least one eccentrically arranged in the pivot shaft (35)

Connecting channel (34) with the gas supply channel (36) is connected.

9) Pneumatic slag stopper according to one of claims 1 to 8, characterized in that in the vicinity of the at least one gas outlet opening in the pivot arm, preferably in the gas outlet module, a plurality of gas outlets (31a, 31b, 31c)

available.

10) Pneumatic slag stopper according to one of claims 1 to 9, characterized in that the pivot drive is gearless.

11) Pneumatic slag stopper according to one of claims 1 to 10, characterized in that the pivot drive at least one crankshaft, and at least one

Pneumatic cylinder for driving the crankshaft, includes.

12) Pneumatic slag stopper according to one of claims 1 to 11, characterized in that the pivot drive is housed in a thermally insulated housing (16). 13) Metallurgical vessel (1) with a taphole channel (3) and one attached to the metallurgical vessel (1)

Slag stopper according to one of claims 1 to 12, characterized in that the longitudinal axis of the taphole channel (3) is substantially parallel to the pivot axis.

14) Method for pneumatically closing a

Taphole channel of a metallurgical vessel with respect to discharge of slag by means of a gas stream provided from at least one gas outlet opening,

wherein the at least one attached to a pivot arm gas outlet opening in front of the tap hole (24) of the

Tapping hole channel is positioned in a sealing position,

characterized in that

to the swivel arm with a pivoting movement in the

Sealing position in front of the taphole (24) is pivoted, wherein the pivoting movement in a longitudinal axis of the

Tapping hole channel (18) is largely perpendicular plane.

15) Method according to claim 14, characterized in that during the pneumatic closing of the taphole channel gas from several

in the vicinity of the at least one gas outlet opening in the swivel arm

gas outlets

flows.