WO2010094259A1

WO2010094259A1 - Device for preventing vortices in metallurgical vessels

Info

Publication number: WO2010094259A1
Application number: PCT/DE2010/000123
Authority: WO
Inventors: Berthold Stilkerieg
Original assignee: Berthold Stilkerieg
Priority date: 2009-02-19
Filing date: 2010-02-04
Publication date: 2010-08-26
Also published as: DE102009009740A1

Abstract

In order to prevent vortices (12) in vessels (1), (5) containing steel melts (2, 7), vortex blocks (10) are disposed in the area of the floor outlets (3, 8, 9) such that the knife edges (11) thereof extend into the vortex (12). The vortex blocks (10) are made of a flat circular segment fixing part (16) and the braking part (15) having the knife edge (11), wherein said one-piece component (15, 16) can be practically placed on the floor outlet (3, 8, 9), or better placed on a perforated brick (20) and connected thereto, because the inner diameter (17) corresponds to that of the floor outlet (3, 8, 9).

Description

DESCRIPTION

Device for vortex avoidance in metallurgical vessels

The invention relates to a device for avoiding the slag with retracting vortexes when emptying vessels containing metal, in particular molten steel, wherein the bottom outlet of a pan or a distributor or a similar metallurgical vessel consisting of a brake part and fixing Vortex or more than the outflow of the Steel melt arising swirl associated with influencing.

When emptying metallurgical vessels with bottom outlet occurs when falling below a certain level of the bath level undesirable running along the top of the molten metal slag. When the metal or steel melt leaks, a steel vortex or strudel occurs, which absorbs the slag due to the high rotational speed. The circumferential speed also increases with decreasing distance to the bottom outlet, so that by the intake of slag, an impairment of the melt quality occurs. According to EP 1 172 447 A1, these problems are to be counteracted by installing one or more plate-shaped installations at a predetermined distance from the bottom outlet. According to EP 1 172 447 A1, these installations have a rectangular shape, consist of a refractory material and are designed in the shape of a plate in such a way that an all-round, correspondingly wide side or edge surface is created. In experiments, it has now been found that even if these installations are arranged reaching into the flow deflection region, ie in the vortex, no or only a very small effect occurs. Rather, the molten steel flows like water around these plate-shaped internals and their side surfaces around, so it does not affect the negative Swirls can come. For this reason, these devices could not prevail. It still comes to the disadvantageous vortices and thus to a Miteinziehen considerable amounts of slag. Particularly problematic is that with lowering of the mirror and increasing rotational speed must be ended very early with the emptying of the vessel, so that a very large "Stahlbär" remains in the vessel, which must be re-melted and reused.

The invention is therefore based on the object to provide an easy-to-install, usable even with stoppers distributors and pans Strudelbremse.

The object is achieved in that the Vortex stone has a circular segment-like fixing part, whose inner diameter is formed corresponding to that of the bottom outlet, and a standing on the fixing part brake part which is equipped with a knife edge.

The specified by the above features vortex stone is deliberately placed tightly and accurately placed on the bottom outlet and can be fully effective after fixing the fixing part at the bottom outlet with its brake part by it with its brake part, which has a knife edge at the front edge, so in the Strudel "cuts in" that it is disturbed and rendered harmless, it is advantageous in particular that the knife edge is located exactly in the area and is positioned so that it acts against the vortex and this makes quickly harmless, so that it has its absorbing effect can not develop at all.

According to an expedient embodiment, it is provided that the fixing part is designed with three or more fixing parts forming a full circle. Such a feature gives the possibility, especially for larger vessels with multiple Bodenausläufen also prevent mutual interference of the floor outlets, because by the all around fixed parts with their whirlpools may be made harmless immediately and quickly, ie without being able to influence the neighborhood. It has been found in experiments that such an arrangement of multiple Vortexstones particularly safe excludes the vortex formation, without requiring a much greater effort would be necessary. The individual Vortex stones are the same design and just need to be arranged around the respective bottom outlet around and fixed above all to be glued.

After a simple training, which is particularly suitable for smaller vessels, it is provided that the braking part of the Vortex stone is placed on the same time serving as a fixing part perforated stone of a bottom outlet and connected to it. The same is possible because fixing and hole stone as such have the same diameter, in which case, however, the brake member must be made separately and then also separately mounted, which is somewhat more complicated than in the Vortex stone consisting of brake and fixing.

Then, if it can be dispensed with an actual fixing part, it is advantageous if the brake part of the Vortex stone is glued to the hole stone, to usual adhesive or mortar can be used to ensure that the vortex stone or its brake part with sufficient time the hole stone remains connected, so as to prevent the formation of swirls until the last safe.

According to a particularly advantageous embodiment, it is provided that the annular fixing part is placed with the associated brake member on the perforated stone of a bottom outlet, preferably adhered thereto, because thereby always the same position of the brake member can be achieved with the knife edge. It is simply determined by the self-annular fixing parts, regardless of whether one or four or more fixing parts are used to completely cover a hole stone. Fixing part and brake member can be glued together used, but it is particularly advantageous if, as provided according to the invention, the fixing part and the brake member are made as a component forming the vortex stone. This ensures the necessary stability of the Vortex stone as a whole, which is connected as a single Vortex stone alone or together with other Vortex stones, for example, with the perforated brick or is assigned in any other way to the respective bottom outlet. In this one-piece design, it is also possible to keep the thickness of the fixing part, ie the corresponding annular disc in the dimensions low, so that so that the assembly of the corresponding components is facilitated.

The embodiments described above are characterized in particular by the fact that they can be easily installed under certain operating conditions. This simplification of the installation is in particular also given when the Vortex stone is arranged and fixed with brake part and fixing part within a tubular starter kit. Such starter kits are used at the beginning of the casting process as protection over the bottom outlet at distributors, which have no plug and work, for example with slide lock or freewheeling, so that no impurities can fall into the bottom outlet at the moment of leakage. The tube or the starter kit acts like a dam and only dissolves when the bath level has reached approx. 250 mm. Then the steel can get directly to the bottom outlet, whereby it is influenced by the arranged within this tube or starter kit Vortex parts so that a vortex does not arise.

Another possibility of constructing a Vortex stone is that in which the brake part is equipped with a mounting part serving as a fixing part, which is designed to correspond with the opening in an adapter plate, wherein the adapter plate is connected to the tundish floor and / or the perforated brick. Through this adapter plate can be easily and selectively changed the dimensions of the entire Vortex stone in the vertical direction. Depending on the thickness the adapter plate will extend the brake part "higher" over the tundish floor, so that consideration can also be given to the height of the entire vessel or to other peculiarities of the vessel in question on top of the brick, depending on how this proves to be appropriate in the particular application.

To ensure that the extension or increase of the brake member with its knife edge remains fully effective even when using the adapter plates, the invention provides that the adapter plate is equipped with a cutting edge, which is designed to extend into the vortex. Then, if the brake member is placed on top of the adapter plate, so you have a virtually continuous cutting / knife edge that can quickly and safely be ineffective the vortex, if the liquid iron or the melt filled into the respective vessel or through the bottom outlets thereof runs out.

Such a vortex stone is particularly advantageous if the braking part of the vortex stone has a knife edge which is designed and arranged corresponding to the cutting edge. This means that the edge over the entire height is the same and is also the same sharp, so that can be effectively taken against the vortex effect.

This continuous sharp edge works specifically against the formation of the swirl, which optimizes is possible when the knife edge of the brake member and the cutting edge of the adapter plate facing the direction of rotation of the swirl and is arranged in this cutting. The liquid, rotating material is almost cut open and forced to the opposite vortex formation, so that it comes to a "standstill".

One way to safely position the Vortex stone in the area of the bottom outlet is to equip the brake part or the fixing part with one or more molded coupling pin, the tundish floor with a is equipped corresponding recess. In this case, the brake member or fixing member may have a corresponding blind bore into which the upper end coupling pin is introduced, before then set the entire component on the insertion of the other end of the coupling pin in the recess in the tundish floor and then to glue. It is understood that in this embodiment, the Vortex stone is not placed on the hole stone, but rather beside it, so as to still specify the position that ensures the dissolution of the vortex. Depending on the circumstances or depending on the design of the vessel, such an arrangement of Vortex stone with brake part and fixing part can represent a particularly stable arrangement and thus provide the desired results as well as the embodiment of the Vortex stone described earlier.

According to an expedient embodiment it is provided that the coupling pin is wedge-shaped, cylindrical, hollow cylindrical or formed with a support ring. With support ring means that the coupling pin is inserted into a larger recess to then insert mortar or the like from above and thus set the coupling pin in the tundish floor or in the associated mortar. This is also possible if corresponding additional parts are used during the application of the mortar.

Another possibility of connecting the fixing part to the bottom of the respective vessel is that in which the fixing part is formed on one or both sides of an L or a T formed over the braking part above. This gives the possibility, the entire vortex stone simply to the bottom of the

Set up vessel and then set with the mortar, which is just possible because the fixing part protrudes on both sides and thus predetermines an embedding in the mortar well. The entire vortex stone then has a stable position and can be optimally effective when slowing down or rendering harmless the vortex or vortex. Depending on the application, it may be expedient, the circuit forming a circle arranged brake parts and fixing parts in the direction of vortex offset from each other, that is, to arrange far enough into the vortex. About this training ensures that each brake member engages in a different region of the swirl 5 and this makes it even more harmless, as if virtually a brake member after the other engages in the same region of the swirl and trying to make harmless. Although, of course, this offset is only possible by a few millimeters or centimeters, it can provide a significantly improved effect, depending on the nature and composition of the liquid metal.

Finally, the invention provides that the brake member is formed as a rectangular plate with respect to height and width, wherein the reaching into the vortex side by resetting the trailing edge at an angle of 15 -.

15 45 °, preferably 30 ° relative to the leading leading edge of the knife edge is formed forming. Already with the term knife edge is expressed that the braking part or the vortex stone in total should intervene in the vortex consisting of liquid metal in such a way that the vortex is very quickly ineffective. This knife edge, which is important for this effect,

20 is achieved as described in that one continues to one of the two edges of the corresponding side of the rectangular brake disk plate or the other side further reset, so that a knife edge with 30 ° angle, for example, arises.

25 The invention is characterized in that a device is created or a whirl brake is provided, which is easy to assemble and accurate to assemble, so that with the necessary security of the vortex is also quickly and safely combated, the leakage of liquid metal from corresponding metallurgical vessels with bordering on safety

30 probability arises. Disadvantageously, these strands draw in the slag, which hampers the subsequent process so much that it must be avoided at all costs. With the help of the corresponding device, ie the Vortex stone and its exact positioning, the emergence of the vortex is already prevented from the beginning or so difficult that he can not unfold its disadvantageous collection effect. Important in the present invention is that it is ensured by the specific shape of the Vortex stone that it is always mounted in the correct position and clearly visible so that it can not even come to wrong positions, which would then just cause him its effect is not or not fully developed. Especially for vessels where starter kits are needed, this can be used for safe arrangement of Vortex stones, which has an advantageous effect and which offers the opportunity to equip even this special training of tubs and vessels easily with correspondingly advantageous working vortex stones.

Further details and advantages of the subject invention will become apparent from the following description of the accompanying drawings in which a preferred embodiment with the necessary details and individual parts is shown. Show it:

Figure 1 is a discharge vessel with subordinate distributor, Figure 2 is an enlarged view of this outlet vessel in

Cut with vortex stones and starter kit,

FIG. 3 shows a unit of three vortex stones in a ring-shaped arrangement,

FIG. 4 is a perspective view of an adapter plate;

5 shows an adapter plate with associated brake part, FIG. 6 shows a brake part seen from above with knife edge,

Figure 7 is a plan view of a tundish floor with attached

Fixing part and associated brake part on the hole stone and Figure 8 is a side view of Vortexsteines with a

Coupling pin as a connecting part.

FIG. 1 shows a discharge vessel 1 with a bottom outlet 3 and the filled liquid steel or molten steel 2. In the area of the Bodenauslaufes 3 is a vortex stone 10 can be seen, which ensures that the outlet of the molten steel 2, the slag layer 6 is not affected, d. H . the vortex 12 produced here is influenced so that the slag layer 6 is not sucked in and is sucked out of the bottom outlet 3 into the melting tube 4.

Also, the subsequent distributor 5 or the corresponding vessel has corresponding fittings or Vortex stones 10, 10 ', 10 "which are arranged in the region of the bottom outlets 8, 8', 9 so that the molten steel 7 in the distributor 5 has no influence In the region of the bottom outlet 8 ', a steel whirlpool or vortex 12 is shown, with the associated vortex stone 10 "being arranged so that it projects with its knife edge 11 into the vortex 12 and the vortex 12 therewith safely influenced and brought to collapse. This influencing has the effect that the slag layer 6 'slowly sinks with the removal of the liquid steel or molten steel 7, but in such a way that the eddy 12 leaves this entire slag layer 6' uninfluenced. This makes it possible to deduct the liquid steel or molten steel 7 virtually to close above the bottom outlets 8, 8 ', 9, which has the great advantage that only a small Stahlbär remains. This is of great advantage because it has hitherto only been possible to remove about 2/3 of the entire contents of the distributor 5 or of the other vessel in order to ensure that no slag is drawn in. This results in a much smaller Stahlbär as mentioned, in which then the remains of the fixtures or Vortex stones 10, 10 ', 10 "are, which can be easily removed with the Stahlbär because they are not so firmly connected to the distributor base 14 Details of this will be discussed later: The liquid steel or molten steel 7 is supplied via the distribution channels 13, 13 ', 13 "to several further processing areas or operations.

FIG. 2 shows an outlet vessel 1 in an enlarged reproduction, wherein it is clear here that the individual vortex blocks 10, 10 'are arranged with their knife edge 11 within a starter kit 22 or within its tube 23. These starter kits 22 are used to ensure at vessels without stopper yet that not already at the beginning of any dirt and vision paint remnants are guided over the bottom outlet 3 in the melt tube 4.

3, the person skilled in the art can first of all deduce that the vortex stone 10 consists of identically formed brake parts 15, 15 ', 15 "and also of fixing parts 16, 18, 19. The fixing parts 16, 18, 19 are part-circular and flat, wherein they have or correspond to an inner diameter 17 which corresponds to or corresponds to that of the perforated block 20, for example according to FIG 7. These units, ie these Vortex blocks 10 with the knife edges 11, 11 ', 11 "are placed on a corresponding perforated block 20 and connected with it, so that they can then fully unfold their effect and ensure that a whirlpool 12 practically does not arise.

According to Figure 4 and Figure 5, the brake member 15 is equipped with a mounting foot 24 which corresponds to the opening 26 in the adapter plate 25 of Figure 4, d. H. can be used there and then fixed. Here is usually done a bond. The peculiarity of the adapter plate 25 is further that it is equipped with a cutting edge 28 which upon insertion or placement of the brake member 15 to a common, d. H. leads to a continuous sharp edge 28, 11.

The particular arrangement or use of the adapter plate 25 allows a very dense approach of the Vortex stone 10 to the perforated stone 20 and to the bottom outlet 3, 8, 9, wherein the edges 11, 28 project into the vortex 12 and affect this simultaneously. Via the adapter plate 25 is given the opportunity to influence the height of the Vortex stone 10, ie to increase, if this proves to be necessary and expedient by the nature or structure of the vessel. It is also conceivable that the adapter plate 25 is placed directly on the tundish floor 27, as indicated in Figure 7 is. In any case, Figure 5 shows that the adapter plate 25 and the brake member 15 are expediently to be arranged so that the optimally effective cutting edge 11, 28 can be fully effective.

This special design of the knife edge 11 is illustrated once again in FIG. 6, where a vortex stone 10 is shown in plan view. Of the Vortexstein 10 here the brake member 15 is shown in plan view, which is rectangular in principle, the leading edge 40 is so far preferred to the trailing edge 39, that the side 38 extends obliquely relative to the other side 41, resulting in the formation of the knife edge eleventh leads. 37, the rectangular side plate is designated, while the top view of the brake member 15, the rectangular head portion 36 reproduces.

FIG. 7 shows an individual view of a bottom outlet, for example 8, which is represented here by the perforated brick 20, against which a fixing part 16, which carries a brake part 15, fits. The knife edge 11 is here brought close to the hole stone 20, which usually closes this knife edge 11 with the inner edge 21 of the hole block 20. One can therefore assume that here the brake member 11 is not yet finally mounted. With 27 of the tundish floor is marked, which is still filled with mortar, so as to set the hole stone 20 as well as the fixing part 16.

Finally, FIG. 8 shows a particular embodiment such that here the fixing part 16 is connected to the braking part 15 by a coupling pin 30 or can be connected. For this purpose, the coupling pin 30 is inserted with the upper end in the blind hole 29, which is formed in the brake shoe base 35. The lower end of the coupling pin 30 has a support collar 32 which can be inserted into the recess 31 in the fixing part 16, for which purpose this recess 31 has a correspondingly large diameter. The coupling pin 30 may be formed as a cylinder 33 or as a hollow cylinder or as a wedge, wherein corresponding is not reproduced here. Now, if the brake member 15 is effectively connected to the fixing member 16 via the coupling pin 30, so there is a supernatant 34 on both sides for the fixing member 16. This then this entire component, ie the Vortex stone 10 can be set on the tundish floor 27, because the fixing member 16 is then effectively retained by the mortar because it can be embedded therein.

All mentioned features, including the drawings to be taken alone, are considered to be essential to the invention alone and in combination.

Claims

1. A device for avoiding the slag (6) with retracting vortexes (12) during emptying of metal, in particular steel melts (2, 7) containing vessels (1, 5), wherein the bottom outlet (3, 8, 9) of a pan or a distributor (5) or a similar metallurgical vessel, a Vortex stone (10) comprising a brake part (15) and a fixing part (16) or several swirls (12) arising during the outflow of the molten steel (2, 7) are associated, d ad that the Vortex stone (10) has a circular segment-like fixing part (16), the inner diameter (17) of which is corresponding to that of the bottom outlet (3, 8, 9), and one on the fixing part (16 ) has upstanding brake part (15) which is equipped with a knife edge (11).

2. A device according to claim 1, characterized in that the fixing part (16) with three or more fixing parts (18, 19) is designed to form a full circle.

3. Device according to claim 1, characterized in that the braking part (15) of the vortex stone (10) acts on the perforated block (20) of a bottom outlet (3, 8, 9) which at the same time serves as a fixing part. attached and connected to it.

4. Device according to claim 3, characterized in that the braking part (15) of the vortex stone (10) is glued to the perforated brick (20).

5. Device according to claim 1, characterized in that the annular fixing part (16) with the associated braking part (15) is placed on the perforated brick (20) of a bottom outlet (3, 8, 9), preferably glued to it ,

6. Device according to one of the preceding claims, dad u rch geken net nets that the fixing part (16) and the brake member (15) are made as a component forming the Vortex stone (10).

7. Device according to one of the preceding claims, characterized Porsche Style nzeichnet that the Vortex stone (10) with brake part (15) and fixing part (16) within a tubular starter kit (22) is arranged and fixed.

8. Device according to one of the preceding claims, dad u rch geken nzeichnet that the brake member (15) is equipped with a fixing part (16) serving mounting foot (24) corresponding to the opening (26) in an adapter plate (25) is formed, wherein the adapter plate (25) with the Tundishboden (27) and / or the perforated brick (20) is connected.

9. Apparatus according to claim 8, dadu rc h geken nzeichnet that the adapter plate (25) is equipped with a cutting edge (28) which is formed reaching into the vortex (12).

10. Device according to one of the preceding claims, characterized in that the braking part (15) of the Vortex stone (10) has a knife edge (11) corresponding to the cutting edge (28) and arranged.

11. The device according to claim 1, wherein the knife edge of the brake part and the cutting edge of the adapter plate against the direction of rotation of the swirl pointing and arranged in this cutting.

12. The device according to any one of the preceding claims, d ze u rc hge ze zen zen etne that the brake member (15) or the fixing member (16) has one or more molded coupling pin (30) and that the Tundishboden (27) with a corresponding recess (31) is equipped.

13. Device according to one of the preceding claims, ad d e r c h e ke n ze ze c h n et that the coupling pin (30) is wedge-shaped, cylindrical, hollow cylindrical or formed with support ring (32).

14. Device according to claim 1, wherein the fixing part (16) is formed on one or both sides of an L or a T projecting over the brake part (15).

15. A device according to one of the preceding claims, characterized in that the brake parts (15) forming a circle and fixing parts (16) are offset in the direction of the whirl (12), ie. H. that is, they are arranged at different distances into the vortex (12).

16. Device according to one of the preceding claims, characterized in that the brake member (15) is designed as a rectangular plate with respect to height and width, wherein the in the vortex (12) reaching into side (38) by resetting the trailing edge (39) at an angle of 15-45 °, preferably 30 ° relative to the leading leading edge (40) forming the knife edge (11) is formed.