Vortex suppression device and method for molten steel in barrel

Abstract

The invention provides a vortex suppression device and method for molten steel in a barrel. Molten steel is injected into the steel drum, the molten steel and the scum are layered in the height direction, and the molten steel can be discharged from the steel outlet; the vortex suppression device for the molten steel in the barrel comprises a floating body, the floating body is provided with a floating body bottom face and a floating body top face which are opposite in the height direction, the floating body is arranged above a steel outlet in the steel barrel and floats between the molten steel and the scum, and the floating body top face is exposed above the scum. The top surface of the floating body is provided with a surface of which the geometric normal vector change is changed into the geometric shape change, so that the heat transfer area of the top surface of the floating body exposed above the scum is increased, the heat dissipation speed is increased, the scum is condensed on the bottom surface of the floating body and the periphery of the floating body more quickly, the area of the floating body in the horizontal direction is increased, and the friction force of the floating body to molten steel is also increased; and the effect of inhibiting vortex generation is improved.

Description

Technical Field

[0001] This invention relates to a device and method for suppressing vortexes in molten steel in a ladle, and particularly to an invention that suppresses vortexes generated during steel tapping by setting a float above the tapping port of the ladle, and by increasing the heat transfer area and heat dissipation rate by changing the geometric normal vector of the exposed surface of the float, allowing slag to condense more quickly around the float, and increasing the area of ​​the float to increase the friction between the float and the molten steel, thereby improving the effect of the float in suppressing vortex generation. Background Technology

[0002] In the continuous casting process of a steel plant, when molten steel is drawn from the ladle (LD) to the tundish (TD), the gravitational potential energy accelerates as the molten steel level drops, and the friction between the molten steel and the ladle wall changes the flow velocity. The pressure is higher in the low-velocity area, causing the fluid to deflect to the high-velocity area and form curved streamlines. This gradually forms vortices on the surface of the molten steel. These vortices can entrain slag and air, causing slag entrapment problems and affecting the cleanliness and yield of the molten steel.

[0003] In the past, the plant would put heat-resistant bricks that could float on the surface of the molten steel to avoid this problem. However, the freely floating heat-resistant bricks could not be aligned with the tap hole, and the effect of suppressing vortex formation was not good. There are other methods such as flotation suppressors and electromagnetic stirring to reduce the slag entrainment problem caused by vortexes, but flotation suppressors and electromagnetic stirring require relatively high equipment costs.

[0004] Korean patent KR102441034B1 proposes a "method and anti-vortex device for preventing slag from mixing in during molten steel discharge". This patent provides an anti-vortex body 100 that floats freely on the molten steel to suppress vortex generation. However, it has the problem that it cannot be aligned with the tapping port at all times, resulting in poor vortex generation suppression effect.

[0005] Taiwanese patent TWM612403U proposes a "continuous casting machine eddy slag suppressor," Chinese patent CN211304770U proposes a "floating plug and floating plug deployment device," and Chinese patent CN222588098U proposes a "ladle structure for preventing slag entrainment in molten steel." The former of these patents employs a suspension method to suspend the suppressor body 10, the floating plug 2, and the float 3, allowing them to float on the molten steel to suppress eddy formation. These patents have complex structures, and the suspension equipment must be coordinated with the molten steel level to ensure the suppressor body 10, the floating plug 2, and the float 3 can float on the molten steel, making operation difficult.

[0006] Korean patent KR1020040034212A proposes a "device to prevent eddy currents and impurities from entering the tundish". This invention uses the part of the screw 10 immersed in the molten steel to have a similar stirring effect to suppress the generation of eddy currents. The invention also sets up a conical check ball 12 that is guided by the screw 10 and can block the outlet as the molten steel level drops.

[0007] Chinese patent CN209754008U proposes a "zirconia-based anti-vortex sizing nozzle." This design uses a hanging ring 1 to fix a guide block 5 to a bracket, thus securing the guide block 5 within the steel drum. Molten steel flows into the nozzle from the bottom and around the guide block 5, preventing the molten steel from rotating and accumulating in one direction to form a vortex. When the nozzle needs to be closed, a positioning rod 3 guides the guide block 5 downwards, causing a plug 10 below the guide block 5 to block the nozzle. Summary of the Invention

[0008] Unlike the aforementioned cases, the purpose of this invention is to provide a device and method for suppressing vortices in molten steel inside a barrel.

[0009] This invention provides a vortex suppression device for molten steel in a ladle, disposed above a steel outlet inside a steel ladle, wherein the molten steel and slag in the ladle are stratified in a vertical direction. The vortex suppression device for molten steel in the ladle includes:

[0010] A float has a bottom surface and a top surface opposite each other in the height direction. The float is placed in the steel drum and floats between the molten steel and the scum. The top surface of the float is exposed above the scum. The top surface of the float has a geometrically changing normal vector, which increases the heat transfer area of ​​the top surface of the float exposed above the scum and improves the heat dissipation rate. This allows the scum to condense more quickly on the bottom surface and periphery of the float, increases the area of ​​the float in the horizontal direction, and also increases the friction of the float with the molten steel, thus improving the effect of suppressing vortex generation.

[0011] Furthermore, the top surface of the float can be transformed into a geometrically changing surface by the change of the geometric normal vector in the height direction. It can be an outwardly convex surface, an inwardly concave surface, or any surface that can increase the heat transfer area.

[0012] Furthermore, the float has a three-layer structure, including a base material layer and a refractory material layer. The refractory material layer covers the base material layer, and there is a hollow layer between the refractory material layer and the base material layer.

[0013] Furthermore, the hollow interior of the float forms an injection space, allowing the overall weight of the float to be adjusted by injecting materials of different specific gravities.

[0014] Furthermore, the float includes a central layer arranged concentrically and at least one assembly layer, through which the width and area of ​​the float in the horizontal direction are adjusted.

[0015] Furthermore, the vortex suppression device for molten steel inside the drum includes: a group of bottom columns consisting of at least two bottom columns extending along the height direction, each bottom column having a maximum width D1 in the horizontal direction, the group of bottom columns being fixedly installed inside the steel drum; a group of guide columns consisting of at least two guide columns, each guide column being respectively installed on each bottom column and extending along the height direction, each guide column having a maximum width D2 in the horizontal direction; and a group of guide holes consisting of at least two guide holes penetrating the bottom and top surfaces of the float along the height direction, each guide hole having a maximum width D3 in the horizontal direction, where D2≤D3<D1. The bottom surface of the float faces the bottom column and passes through the guide holes into the guide column so that the bottom surface of the float faces the steel outlet, and the float is guided to move in the height direction by the guide columns, and the float can be restricted in position by the bottom surface of the float abutting against the bottom column.

[0016] Furthermore, the base column has a fixed part and an adjustable part, the adjustable part being disposed on the fixed part and its position being adjustable in the height direction.

[0017] Furthermore, after the float passes through the guide post, a blocking block is installed above the guide post. The blocking block is, for example, a pin inserted into the end of the guide post, or a nut screwed into the end of the guide post.

[0018] The present invention further provides a method for suppressing vortexes in molten steel using the aforementioned vortex suppression device in a ladle, comprising:

[0019] Molten steel is poured into the steel drum, and the molten steel and a scum are separated in the same height direction, so that the float floats between the molten steel and the scum, and the top surface of the float is exposed above the scum. When the molten steel is discharged from the outlet, the float can suppress the generation of vortex when the molten steel is discharged from the outlet.

[0020] By increasing the heat transfer area and improving the heat dissipation rate through the top surface of the float with its geometrically changing normal vector, the scum can be condensed more quickly on the bottom surface and periphery of the float, increasing the area of ​​the float in the horizontal direction and also increasing the friction of the float with the molten steel, thereby improving the effect of suppressing vortex generation.

[0021] Furthermore, the float is placed in the steel drum in a cold material manner to allow the scum to condense more quickly. The cold material manner means that the temperature of the float is not higher than room temperature.

[0022] The following effects can be achieved based on the above technical features:

[0023] 1. The present invention, by positioning a float above the outlet of the steel drum, can suppress the generation of vortices when molten steel is discharged from the outlet.

[0024] 2. The top surface of the float is exposed above the scum, and the top surface of the float changes its geometric shape through the change of the geometric normal vector, which can increase the heat transfer area and improve the heat dissipation rate. This allows the scum to condense more quickly on the bottom surface and periphery of the float, increases the area of ​​the float in the horizontal direction, and also increases the friction of the float with the molten steel, thus improving the effect of suppressing vortex generation.

[0025] 3. As the molten steel level drops, the float will press against the bottom column and be restricted, which can prevent the float from blocking the steel tapping port.

[0026] 4. When steel drums of different sizes are used due to process requirements, the width D4 and area of ​​the float can be adjusted in the horizontal direction by using a concentrically set central layer and assembly layer, depending on the width of the vortex generated inside the steel drum, to ensure that the float has sufficient width D4 and area to suppress the generation of vortex.

[0027] 5. The adjustable part of the bottom column can be adjusted in height relative to the fixed part, allowing the float to descend to its minimum height as the liquid level rises, maximizing the yield of different steel grades while avoiding slag entrapment. In other words, the higher the molten steel height, the higher the vortex will form, making slag entrapment more likely. Therefore, the ratio of the minimum height of the float to the molten steel height is set between approximately 0.07 and 0.13 to prevent slag entrapment.

[0028] 6. The float may include a base material layer, a hollow layer and a refractory material layer. The hollow layer provides space for thermal expansion and contraction between the base material layer and the refractory material layer, preventing the refractory material layer from cracking due to the expansion of the base material layer and the refractory material layer when the float comes into contact with high-temperature molten steel.

[0029] 7. The float can be made hollow to form an injection space, and the overall specific gravity of the float can be adjusted by injecting materials with different specific gravities. This ensures that when molten steel with different specific gravities (densities) is injected into the steel drum due to different processes, the float can float between the molten steel and the slag. Attached Figure Description

[0030] Figure 1 This is an exploded perspective view of the vortex suppression device for molten steel in a barrel according to the present invention.

[0031] Figure 2 This is a three-dimensional assembly diagram of the vortex suppression device for molten steel in a barrel according to the present invention.

[0032] Figure 3 This is a schematic diagram of the vortex suppression device for molten steel in a steel drum according to the present invention, showing the float floating between the molten steel and slag.

[0033] Figure 4 This is a schematic diagram of the vortex suppression device for molten steel in a steel drum of the present invention, showing the buoy descending to the bottom column as the molten steel exits from the outlet.

[0034] Figure 5 This is an exploded perspective view of a vortex suppression device for molten steel in a barrel according to another embodiment of the present invention, showing that the float includes a central layer and an assembly layer arranged concentrically.

[0035] Figure 6 for Figure 5 A three-dimensional composite diagram.

[0036] Figure 7 This is a schematic diagram of the use of a vortex suppression device for molten steel in a barrel according to another embodiment of the present invention, showing that the width D4 and area in the horizontal direction of the float are adjusted by a concentrically arranged central layer and an assembly layer.

[0037] Figure 8 This is a schematic diagram of the use of a vortex suppression device for molten steel in a barrel according to another embodiment of the present invention, showing that the width D4 and area of ​​the float are adjusted in the horizontal direction by means of a concentrically arranged central layer and two assembly layers.

[0038] Figure 9 This is an exploded perspective view of a vortex suppression device for molten steel in a barrel according to another embodiment of the present invention, showing that the base column has a fixed part and an adjustable part assembled in the height direction.

[0039] Figure 10 This is a schematic diagram of the use of the vortex suppression device for molten steel in a drum according to another embodiment of the present invention. It shows that when using molten steel of different grades, the position of the adjustable part relative to the fixed part is adjusted in the height direction, so that the float can be lowered to the minimum height as the liquid level decreases without slag entrapment.

[0040] Figure 11 This is a schematic diagram of the use of the vortex suppression device for molten steel in a drum according to another embodiment of the present invention. It shows that when using molten steel of different grades, the position of the adjustable part relative to the fixed part is adjusted in the height direction, so that the float can be lowered to the minimum height as the liquid level decreases without slag entrapment.

[0041] Figure 12 This is a schematic diagram illustrating a variation of the float in the vortex suppression device for molten steel in the barrel according to the present invention. The float includes a base material layer, a hollow layer, and a refractory material layer. The hollow layer provides space for thermal expansion and contraction of the base material layer and the refractory material layer, thereby preventing the refractory material layer from cracking.

[0042] Figure 13 This is a schematic diagram of a second example of the variation of the float in the vortex suppression device for molten steel in the barrel of the present invention. It shows that the float is hollow inside and the overall specific gravity of the float can be adjusted by injecting materials with different specific gravities.

[0043] Explanation of reference numerals in the attached drawings: 1-Bottom column; 11-Fixing part; 111-Screw hole; 12-Adjustable part; 121-Screw; 2-Guide column; 3-Float; 31-First surface; 32-Second surface; 33-Guide hole; 34-Central layer; 35-Assembly layer; 351-Assembly component; 352-Pin; 36-Base material layer; 37-Refractory material layer; 38-Hollow layer; 39-Injection space; 4-Nut; 5-Steel barrel; 51-Steel outlet; 6-Molten steel; 7-Scum; H-Height direction; L-Horizontal direction; D1-Bottom column diameter; D2-Guide column diameter; D3-Guide hole diameter; D4-Float diameter. Detailed Implementation

[0044] The following embodiments are merely illustrative of the vortex suppression device and method for molten steel in a ladle according to the present invention, and are not intended to limit the invention. In different embodiments, the same elements are given the same reference numerals.

[0045] Please see Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a vortex suppression device for molten steel in a barrel, comprising: a bottom column group, a guide column group, and a float 3. The bottom column group includes four bottom columns 1, and the guide column group includes four guide columns 2.

[0046] The base post 1 extends along a height direction H and has a maximum width D1 in a horizontal direction L. In this embodiment, the base post 1 is cylindrical, and the maximum width D1 is the diameter D1 of the base post.

[0047] The guide post 2 is disposed on the base post 1 and extends along the height direction H. The guide post 2 has a maximum width D2 in the horizontal direction L. In this embodiment, the guide post 2 is cylindrical, and the maximum width D2 is the guide post diameter D2.

[0048] The float 3 has a bottom surface 31 and a top surface 32 opposite each other in the height direction H. The top surface 32 has a geometrically changing surface whose normal vector changes to a geometrically changing surface. The geometrically changing surface can be, for example, a convex surface, a concave surface, a wavy surface, a honeycomb surface, or any other surface that can increase the heat transfer area. In this embodiment, the top surface 32 is made into a gradually concave surface. The float 3 is provided with four guide holes 33 along the height direction H, penetrating the bottom surface 31 and the top surface 32. The guide holes 33 have a maximum width D3 in the horizontal direction L, and D2≤D3<D1. In this embodiment, the guide holes 33 are circular holes, and the maximum width D3 is the diameter D3 of the guide hole.

[0049] The bottom surface 31 of the float 3 faces the bottom post 1 and passes through the guide post 32 through the guide hole 33. It can be guided to move in the height direction H by the guide post 2. The float 3 can also be restricted in position by the bottom surface 31 of the float against the bottom post 1. After the float 3 passes through the guide post 2, a blocking block is set above the guide post 2. In this embodiment, the blocking block uses a nut 4 screwed into the end of the guide post 2, but it is not limited to this. The blocking block can also use, for example, a pin inserted into the end of the guide post 2, etc., which can prevent the float 3 from coming off the guide post 2.

[0050] Please see Figure 3 and Figure 4 As shown, for example, when using a continuous casting process, the base column 1 is fixedly installed on the bottom surface of a steel drum 5. The fixing method can be, for example, a pin-type fixing method, where a material with a specific gravity greater than that of the molten steel 6 and the base column 1 is used to secure it to the insertion hole on the bottom surface of the steel drum 5; or a cement-casting method, where the base column 1 is fixed to the bottom surface of the steel drum 5 with cement; or welding, screwing, snap-fit, etc., can also be used to fix the base column 1 to the bottom surface of the steel drum 5, with the float 3 positioned above the steel outlet 51 on the bottom surface of the steel drum 5. Molten steel 6 is injected into the steel drum 5 and discharged from the steel outlet 51. The float 3 can suppress the generation of vortices when the molten steel 6 is discharged from the steel outlet 51. In this system, molten steel 6 and a scum 7 are separated in the height direction H. A float 3 floats between the molten steel 6 and the scum 7, with its top surface 32 exposed above the scum 7. Because the top surface 32 has a geometrically varying normal vector, it increases the heat transfer area of ​​the float 3 exposed above the scum 7, thereby improving heat dissipation and allowing the scum 7 to condense more quickly on the bottom surface 31 and periphery of the float 3. Increasing the area of ​​the float 3 in the horizontal direction L also increases the friction between the float 3 and the molten steel 6, improving the effect of suppressing vortex formation. As the liquid level of the molten steel 6 decreases, the float 3 will abut against the bottom column 1 and be confined, preventing it from clogging the outlet 51. The float 3 can be placed in the steel drum 5 using a cold-material method, allowing the scum 7 to condense more quickly. The cold-material method refers to the float 3's temperature not exceeding room temperature.

[0051] Please see Figure 5 and Figure 6 As shown, this is another embodiment of the vortex suppression device for molten steel in a drum according to the present invention. In this embodiment, the float 3 includes a central layer 34 arranged concentrically and at least one assembly layer 35. Each assembly layer 35 is composed of, for example, multiple assembly parts 351. Each assembly part 351 is assembled onto the central layer 34 by, for example, using a pin 352. The width D4 and area (e.g., ...) of the float 3 in the horizontal direction L can be adjusted by the assembly layer 35. Figure 7 , Figure 8As shown in the figure, in this embodiment, the float 3 is circular, and the width D4 is the diameter D4 of the float.

[0052] Please see Figure 7 and Figure 8 As shown, since the steel drum 5 used may vary in size depending on the process requirements, the width of the vortex generated when the molten steel 6 is discharged from the outlet 51 will also vary. Therefore, an assembly layer 35 can be pre-assembled in the radial horizontal direction L of the central layer 34 according to the size of the steel drum 5 used and the width of the generated vortex. Figure 7 As shown), the second-layer assembly layer 35 (as shown) Figure 8 (As shown) or more layers 35 are assembled to ensure that the float 3 has a sufficient float diameter D4 and area to suppress vortex generation.

[0053] Please see Figure 9 The image shows a vortex suppression device for molten steel in a drum according to another embodiment of the present invention. In this embodiment, the base column 1 includes a fixed part 11 and an adjustable part 12. The adjustable part 12 is disposed on the fixed part 11 and its position can be adjusted in the height direction H. For example, the fixed part 11 is provided with a screw hole 111 recessed in the height direction H, and the adjustable part 12 is provided with a corresponding screw 121. The position of the adjustable part 12 relative to the fixed part 11 in the height direction H is adjusted by adjusting the number of turns of the screw 121 into the screw hole 111.

[0054] Please see Figures 9 to 11 As shown, since different grades of molten steel 6 are injected into the steel drum 5 according to process requirements, in order to be applicable to different steel grades, the position of the adjustable part 12 relative to the fixed part 11 in the height direction H can be adjusted. Under the premise of avoiding slag entrapment, the float 3 can be lowered to the minimum height as the liquid level rises, thereby maximizing the yield of different steel grades. The ratio of the minimum height of the float 3 to the height of the molten steel is set to approximately between 0.07 and 0.13.

[0055] Please see Figure 12The image shows a variation of the float 3 in the vortex suppression device for molten steel in the barrel of the present invention. The float 3 has a three-layer structure, including a base material layer 36 and a refractory material layer 37 covering the base material layer 36. There is a hollow layer 38 between the refractory material layer 37 and the base material layer 36. The base material layer 36 serves as the overall skeleton of the float 3, and its material melting point is higher than the temperature of the molten steel 6. The hollow layer 38 provides space for thermal expansion and contraction between the base material layer 36 and the refractory material layer 37, preventing the refractory material layer 37 from cracking due to the expansion of the base material layer 36 and the refractory material layer 37 when the float 3 comes into contact with the high-temperature molten steel 6. In terms of manufacturing, a wax layer can be wrapped around the outside of the base material layer 36, with the thickness designed to be the sum of the additional thickness of the base material layer 36 and the refractory layer 37 after heating and expansion. The refractory layer 37 is then applied as the outermost layer, with an opening reserved at the top. After the refractory layer 37 dries, it is heated to melt the inner wax layer. The molten wax is then discharged through the opening at the top, and the opening is filled with refractory material to complete the structure.

[0056] Please see Figure 13 As shown, this is a second example of the variation of the float of the vortex suppression device for molten steel in the drum of the present invention. The float 3 has a hollow interior forming an injection space 39. By injecting materials of different specific gravities into the injection space 39, the overall specific gravity of the float 3 can be adjusted. This ensures that when molten steel 6 of different specific gravities (densities) is injected into the steel drum 5 due to different processes, the float 3 can float between the molten steel 6 and the slag 7. There is no need to replace the float 3 with a different specific gravity material, which is more convenient to use.

[0057] Based on the above description of the embodiments, it should be fully understood that the operation, use and effects of the present invention are as follows. The above embodiments are only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made based on the content of the present invention should fall within the scope of the present invention.

Claims

1. A vortex suppression device for molten steel in a drum, disposed above a steel outlet inside a steel drum, wherein the molten steel and slag in the drum are stratified in a height direction, characterized in that, The vortex suppression device for the molten steel inside the barrel includes: A float has a bottom surface and a top surface opposite each other in the height direction. The float is placed in the steel drum and floats between the molten steel and the scum. The top surface of the float is exposed above the scum. The top surface of the float has a geometrically changing normal vector, which increases the heat transfer area of ​​the top surface of the float exposed above the scum and improves the heat dissipation rate. This allows the scum to condense more quickly on the bottom surface and periphery of the float, increases the area of ​​the float in the horizontal direction, and also increases the friction of the float with the molten steel, thus improving the effect of suppressing vortex generation.

2. The vortex suppression device for molten steel in a ladle as described in claim 1, characterized in that, The top surface of the float changes its geometric shape in the height direction by the change of the geometric normal vector. It can be a convex surface, a concave surface, a wave-shaped surface, a honeycomb-shaped surface, or any surface that can increase the heat transfer area.

3. The vortex suppression device for molten steel in a ladle as described in claim 1, characterized in that, The float has a three-layer structure, including a base material layer and a refractory material layer. The refractory material layer covers the base material layer, and there is a hollow layer between the refractory material layer and the base material layer.

4. The vortex suppression device for molten steel in a ladle as described in claim 1, characterized in that, The hollow interior of the float forms an injection space, which allows the overall weight of the float to be adjusted by injecting materials of different specific gravities.

5. The vortex suppression device for molten steel in a ladle as described in claim 1, characterized in that, The float includes a central layer arranged concentrically and at least one assembly layer, through which the width and area of ​​the float in the horizontal direction are adjusted.

6. The vortex suppression device for molten steel in a ladle as described in claim 1, characterized in that, Also includes: A bottom post assembly consisting of at least two bottom posts extending along the height direction, each bottom post having a maximum width D1 in the horizontal direction, the bottom post assembly being fixedly installed inside the steel drum; a guide post assembly consisting of at least two guide posts, each guide post being respectively installed on each bottom post and extending along the height direction, each guide post having a maximum width D2 in the horizontal direction; a guide hole assembly consisting of at least two guide holes penetrating the bottom and top surfaces of the float along the height direction, each guide hole having a maximum width D3 in the horizontal direction, and D2≤D3<D1, the bottom surface of the float facing the bottom post and passing through the guide post via the guide hole so that the bottom surface of the float faces the steel outlet, and the float is guided to move in the height direction by the guide post, the float being restricted in position by the bottom surface of the float abutting against the bottom post.

7. The vortex suppression device for molten steel in a ladle as described in claim 6, characterized in that, The base column has a fixed part and an adjustable part. The adjustable part is provided on the fixed part and can be adjusted in the height direction. The ratio of the lowest height of the float against the base column to the height of the molten steel is between 0.07 and 0.

13.

8. The vortex suppression device for molten steel in a ladle as described in claim 6, characterized in that, After the float passes through the guide post, a blocking block is set above the guide post.

9. The vortex suppression device for molten steel in a ladle as described in claim 8, characterized in that, The blocking block is either a pin inserted into the end of the guide post or a nut screwed into the end of the guide post.

10. A method for suppressing vortexes in molten steel in a ladle using a vortex suppression device as described in any one of claims 1 to 9, characterized in that, include: Molten steel is poured into the steel drum, and the molten steel and a scum are separated in the height direction, so that the float floats between the molten steel and the scum, and the top surface of the float is exposed above the scum. When the molten steel is discharged from the steel outlet, the float can suppress the generation of vortex when the molten steel is discharged from the steel outlet. By increasing the heat transfer area and improving the heat dissipation rate through the top surface of the float with its geometrically changing normal vector, the scum can be condensed more quickly on the bottom surface and periphery of the float, increasing the area of ​​the float in the horizontal direction and also increasing the friction of the float with the molten steel, thereby improving the effect of suppressing vortex generation.

11. The method for suppressing vortexes in molten steel inside a ladle as described in claim 10, characterized in that, The float is placed in the steel drum in a cold material manner to allow the scum to condense more quickly. The cold material manner means that the temperature of the float is not higher than room temperature.

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