An inclusion cleaning device for tundish

Abstract

The present invention relates to the field of continuous casting technology, specifically to an inclusion cleaning device for a tundish, comprising an impact zone, a retaining wall, and a blowing component; the impact zone is arranged at the bottom of the tundish and located below the long water nozzle, directly bearing the impact of the molten steel from the long water nozzle; the retaining wall is arranged at the bottom of the tundish in the direction of the molten steel flowing out of the impact zone and is connected to the tundish wall at both ends, forming an enclosed space with the tundish wall on the side of the impact zone, and a steel flow hole is arranged on the retaining wall; the blowing component is arranged on the retaining wall, and is used to blow air into the molten steel in the enclosed space. The present invention can reduce the dead zone volume between the retaining wall and the impact zone, not only improving the inclusion removal effect, but also greatly improving the overall quality of the molten steel, and is more suitable for use in a multi-stream tundish, with the advantages of significantly improving production efficiency and product quality stability.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous casting, in particular to an inclusion cleaning device for a tundish. Background Art

[0002] In the steelmaking process, the tundish is one of the core equipment for ensuring the quality of molten steel. Responsible for transporting the refined molten steel to the casting machine, the tundish not only maintains the temperature and flow stability of the molten steel, but also ensures that the molten steel maintains the highest degree of cleanliness during transportation. The cleanliness of molten steel is one of the important indicators for evaluating the quality of steel products. For high-demand steel grades, such as clean steel, the control of inclusions in the molten steel is particularly critical, as inclusions can significantly affect the mechanical properties, ductility, and durability of the steel. Clean steel has an extremely low tolerance for inclusions, so during the continuous casting process, the removal of inclusions is very strict. To achieve this goal, steel producers need efficient tundish cleaning equipment to guarantee the quality of the molten steel, thereby ensuring that the final product meets strict quality standards. Summary of the Invention

[0003] This invention provides an inclusion cleaning device for a tundish. This device aims to improve the flow of molten steel by modifying the traditional tundish structure, thereby removing inclusions from the molten steel and addressing the impact of inclusions on steel quality in existing technologies. By optimizing inclusion removal, the overall cleanliness of the molten steel is improved.

[0004] The present invention provides an inclusion cleaning device for a tundish, comprising:

[0005] Impact zone, retaining wall, blowing components;

[0006] The impact zone is set at the bottom of the tundish and below the shroud, directly bearing the impact of the molten steel from the shroud;

[0007] The retaining wall is arranged at the bottom of the tundish in the direction of the molten steel flowing out of the impact zone and is connected to the tundish wall at both ends to form an enclosed space with the tundish wall on the side of the impact zone. The retaining wall is provided with a steel flow hole.

[0008] The air blowing component is arranged on the retaining wall and is used for blowing air into the molten steel in the enclosed space.

[0009] As a preferred embodiment of the inclusion cleaning device for a tundish described in the present invention, the top surface of the impact zone is a plane, a slope or an arc surface, and the angle between the slope and the vertical direction is not less than 20°.

[0010] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the cross-section of the retaining wall is a combination of at least two curved surfaces, and the curvature of the retaining wall is not greater than 0.8.

[0011] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the blowing component is arranged in the middle and lower part of the retaining wall.

[0012] As a preferred embodiment of the inclusion cleaning device for a tundish described in the present invention, the total gas flow rate of the blowing component is related to the amount of molten steel, the total blowing amount of the blowing component per hour is 0.5 to 5 times the volume of molten steel poured per hour; the blowing mode is continuous blowing or intermittent blowing.

[0013] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the blowing component is a breathable brick, and the gas blown into the blowing component is argon.

[0014] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the direction of the air flow blown in by the blowing component is horizontally or obliquely upward.

[0015] As a preferred solution of the inclusion cleaning device for the tundish described in the present invention, the total area of ​​the steel flow holes arranged on the retaining wall does not exceed 30% of the area of ​​the retaining wall; the total area of ​​the blowing components arranged on the retaining wall does not exceed 45% of the area of ​​the retaining wall.

[0016] As a preferred embodiment of the inclusion cleaning device for a tundish according to the present invention, the bottom area of ​​the entire inclusion cleaning device (i.e., the bottom area of ​​the enclosed space) does not exceed 40% of the bottom area of ​​the entire tundish and is not less than 5%.

[0017] As a preferred embodiment of the inclusion cleaning device for a tundish according to the present invention, the area of ​​the impact zone does not exceed 95% of the bottom area of ​​the entire inclusion cleaning device.

[0018] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the length of the retaining wall does not exceed 60% of the length between the two ends of the inner wall of the tundish in the direction of the long axis.

[0019] As a preferred embodiment of the inclusion cleaning device for a tundish described in the present invention, a gas channel is provided in the blowing component, which is connected to the gas supply device and is used to blow external gas into the molten steel in the enclosed space; the distribution form of the gas channel of the blowing component includes uniform distribution, concentrated distribution, gradient distribution or staggered distribution.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention provides an inclusion cleaning device for a tundish, comprising an impact zone, a retaining wall, and a blowing component. The impact zone is disposed at the bottom of the tundish and below the shroud, directly bearing the impact of molten steel from the shroud. The retaining wall is disposed at the bottom of the tundish in the direction of molten steel outflow from the impact zone and is connected to the tundish wall at both ends, forming an enclosed space with the tundish wall on the side of the impact zone. The retaining wall is provided with steel flow holes. The blowing component is disposed on the retaining wall and is used to blow air into the molten steel within the enclosed space. The present invention can reduce the dead zone volume between the retaining wall and the impact zone, thereby not only improving the inclusion removal effect but also significantly improving the overall quality of the molten steel. It is more suitable for use in multi-stream tundishes and has the advantages of significantly improving production efficiency and maintaining product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of the inclusion cleaning device of the present invention;

[0024] Figure 2 is a top cross-sectional view of the inclusion cleaning device of the present invention;

[0025] Figure 3 is a side sectional view of the inclusion cleaning device of the present invention;

[0026] Figure 4 It is a cross-sectional view of a tundish equipped with the inclusion cleaning device of the present invention.

[0027] Description of Figure Numbers:

[0028] 1-impact zone, 2a-retaining wall, 2b-blowing component, 2c-steel flow hole, 3-tundish, 4-taphole.

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0030] The following will be a clear and complete description of the technical solutions in the embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] The main purpose of the present invention is to provide an inclusion cleaning device for a tundish, which has the following advantages:

[0032] (1) Impact zone design: The shape and layout of the top surface of the impact zone can reduce flow obstruction, allowing the molten steel to flow more evenly to each area. This optimized flow path reduces the possibility of molten steel being retained in dead zones, ensuring that more molten steel can participate in the cleaning and inclusion removal process.

[0033] (2) Curved retaining wall design: It can effectively guide the flow of molten steel, reduce flow resistance, ensure that the molten steel passes through in a smoother manner, reduce local wear, and reduce the erosion caused by refractory materials entering the molten steel to form inclusions, thereby reducing the damage caused by impact on the material and extending the service life of the retaining wall.

[0034] (3) Blowing component design: The dead zone volume is reduced to ensure that the gas can evenly penetrate the entire impact zone. The uniform gas distribution helps to improve the overall fluidity and tumbling effect of the molten steel, further improving the cleanliness.

[0035] (4) By optimizing gas flow and molten steel movement, not only is the buoyancy of inclusions increased, but inclusions are also concentrated in the slag layer, significantly increasing the inclusion removal rate. The improvement in cleanliness directly affects the performance of the final product, resulting in better mechanical properties and processability of the steel.

[0036] (5) The size of the impact zone and retaining wall can be flexibly adjusted according to the actual size of the ladle, ensuring that the device can work effectively under different production conditions, thereby optimizing the handling of inclusions and improving production adaptability.

[0037] like Figure 1-4 As shown, an embodiment of the present invention provides an inclusion cleaning device for a tundish, comprising:

[0038] Impact zone 1, retaining wall 2a, blowing component 2b;

[0039] The impact zone 1 is arranged at the bottom of the tundish 3 and below the shroud, directly bearing the impact of the molten steel from the shroud; the impact force of the molten steel is used to promote the rise and separation of inclusions;

[0040] The retaining wall 2a is arranged at the bottom of the tundish 3 in the direction of molten steel outflow from the impact zone 1 and is connected to the wall of the tundish 3 at both ends, forming an enclosed space with the wall of the tundish 3 on the side of the impact zone 1. The retaining wall 2a is provided with a steel flow hole 2c.

[0041] The blowing component 2b is arranged on the retaining wall 2a and is used to blow air into the molten steel in the enclosed space.

[0042] In one embodiment of the present invention, the top surface of the impact zone 1 is a plane, a slope or an arc surface, and the top surface of the impact zone 1 is a multi-segment distribution structure, such as a multi-segment plane, a multi-segment slope or a multi-segment arc surface; when a slope is used, the angle between the slope and the vertical direction is not less than 20°. The design flexibility of the top surface of the impact zone 1 helps to optimize the flow direction and speed of the gas, thereby improving the cleaning effect. At the same time, it can also delay the scouring of the impact zone 1 by the molten steel, thereby increasing the service life of the impact zone 1. The top surface of the impact zone 1 of different shapes can be selected according to the needs of actual applications to adapt to different cleaning environments and operating conditions.

[0043] In one embodiment of the present invention, the cross-section of the retaining wall 2a is a combination of at least two curved surfaces, and the curvature of the retaining wall 2a is not greater than 0.8. The geometric shape of the retaining wall 2a adopts a curved surface (such as an arc shape or a streamlined shape) design, aiming to enhance impact resistance and improve flow characteristics. Compared with the traditional plane structure, the curved surface design can effectively reduce local stress concentration and reduce the impact strength of the molten steel during flow. The curved surface structure reduces the direct impact force and optimizes the flow efficiency by changing the flow direction of the molten steel. During the design process, the radius and slope of the curved surface need to be accurately calculated according to the flow characteristics of the molten steel to ensure the best force effect, which can improve the service life of the retaining wall.

[0044] In one embodiment of the present invention, the blowing component 2b is arranged in the middle and lower part of the retaining wall 2a; the total gas flow rate of the blowing component 2b is related to the amount of molten steel, and the total amount of gas blown by the blowing component per hour is 0.5 to 5 times the volume of molten steel poured per hour. The blowing method is continuous blowing or intermittent blowing; the blowing component 2b is a breathable brick, and the gas blown into the blowing component 2b is argon; the direction of the air flow blown into the blowing component 2b is horizontal or obliquely upward. The design of the blowing component 2b is to use side-blowing gas to churn and stir the molten steel, further promoting the rise and removal of inclusions. Reasonable pore flow can maintain the stable operation of the cleaning device, ensure effective cleaning of the interior of the ladle 3, and extend the service life of the equipment. The gas blowing method can be adjusted according to actual needs to optimize the cleaning process. Continuous blowing can provide a stable airflow, while intermittent blowing can adjust the airflow intensity to adapt to different cleaning needs and operating conditions.

[0045] In one embodiment of the present invention, the total area of ​​the steel flow holes 2c provided on the retaining wall 2a does not exceed 30% of the area of ​​the retaining wall 2a, and the molten steel can flow out through the steel flow holes 2c, thereby optimizing the flow of the molten steel and the treatment of inclusions. This arrangement can effectively adapt to ladles 3 of different sizes, thereby improving the adaptability of the equipment and the flexibility of operation. It will also help to reduce production losses caused by size mismatch and improve overall production efficiency. The total area of ​​the blowing components 2b provided on the retaining wall 2a does not exceed 45% of the area of ​​the retaining wall 2a to avoid excessive occupation of the effective space of the tundish; limiting the area of ​​the blowing components also helps to ensure the structural stability of the retaining wall and avoid mechanical stress concentration or damage caused by too many blowing ports; at the same time, an appropriate area ratio helps to ensure uniform distribution of the airflow in the tundish, avoid local overcooling or overheating, and thus improve the temperature and composition uniformity of the molten steel.

[0046] In one embodiment of the present invention, the entire inclusion cleaning device bottom area (i.e., the enclosed space bottom area) does not exceed 40% of the total tundish bottom area. The length of retaining wall 2a does not exceed 60% of the length between the two ends of the inner wall of the tundish 3 along its long axis. This ensures that the inclusion cleaning device does not occupy excessive space, thereby enhancing the efficiency of the tundish cleaning process and preventing interference with other operations. Adjusting the size of retaining wall 2a provides the device with greater adaptability and flexibility, allowing for optimized cleaning results based on actual usage.

[0047] In one embodiment of the present invention, the area of ​​the impact zone does not exceed 95% of the bottom area of ​​the entire inclusion cleaning device to ensure sufficient space for inclusion processing and effective tumbling of the molten steel.

[0048] In one embodiment of the present invention, a gas channel is provided within the blowing component 2b, connected to a gas supply device, for blowing external gas into the molten steel within the enclosed space. The gas channel of the blowing component 2b can be distributed in a uniform, concentrated, gradient, or staggered manner. The structural design of the gas channel allows gas to evenly pass through the blowing component 2b and enter the molten steel within the enclosed space. This structural design ensures uniform distribution of gas within the blowing component 2b, thereby enhancing the gas's cleaning effect on the molten steel. This uniform gas flow not only effectively removes inclusions but also optimizes the flow state of the molten steel, improving the overall quality and stability of the molten steel.

[0049] When the inclusion cleaning device for the tundish of the present invention is in use, molten steel flows into the impact zone 1 from the long water nozzle, the molten steel in the impact zone 1 churns in the impact zone, and is churned and stirred by the gas blown into the blowing component 2b. During the rising process, the bubbles continuously aggregate and absorb inclusions, and then rise to the slag surface. The molten steel that has passed through the impact zone and the gas treatment flows out from the steel flow hole 2c, and then the molten steel flows out from the steel outlet 4.

[0050] In one embodiment of the present invention, the top surface of the impact zone 1 is a slope or arc surface, and the angle α between the slope and the vertical direction is 30°; the cross section of the retaining wall 2a is a combination of two curved surfaces, and the curvature of the retaining wall 2a is 0.75. The gas flow rate of the blowing component 2b is 1000m 3 / h, with continuous air blowing. The total area of ​​the steel flow holes 2c provided on the retaining wall 2a is 15% of the area of ​​the retaining wall 2a, and the total area of ​​the air blowing components 2b provided on the retaining wall 2a is 30% of the area of ​​the retaining wall 2a. The bottom area of ​​the entire inclusion cleaning device (i.e., the bottom area of ​​the enclosed space) is 30% of the total bottom area of ​​the tundish. The ratio of the length of the retaining wall 2a to the length between the two ends of the inner wall of the tundish 3 along the long axis is 2:7. The impact zone area is 80% of the total bottom area of ​​the inclusion cleaning device. After using this cleaning device, the cleanliness of the molten steel was significantly improved, with an inclusion removal rate of 52.49%. In contrast, in a tundish without the inclusion cleaning device of this embodiment, the inclusion removal rate was only 39.55%.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A device for cleaning inclusions in a tundish, characterized in that: include: Impact zone, retaining wall, blowing components; The impact zone is located at the bottom of the tundish and below the shroud, directly bearing the impact of the molten steel from the shroud. The top surface of the impact zone can be a flat surface, a sloped surface, or a circular arc surface. When a sloped surface is used, the angle between the slope and the vertical direction shall not be less than 20°. The retaining wall is set at the bottom of the tundish in the direction of molten steel outflow in the impact zone and is connected to the tundish wall at both ends, forming an enclosed space with the tundish wall on the side of the impact zone. The retaining wall is provided with steel flow holes; the total area of ​​the steel flow holes provided on the retaining wall shall not exceed 30% of the retaining wall area; The blowing components are arranged on the retaining wall and are used to blow air into the molten steel in the enclosed space; the total area of ​​the blowing components arranged on the retaining wall shall not exceed 45% of the area of ​​the retaining wall; the direction of the air flow blown by the blowing components is horizontal or obliquely upward, and the blowing components use side-blowing gas to churn and stir the molten steel, thereby promoting the rise and removal of inclusions; limiting the area of ​​the blowing components helps to ensure the structural stability of the retaining wall and avoid mechanical stress concentration or damage caused by too many blowing ports; at the same time, an appropriate area ratio helps to ensure uniform distribution of air flow in the tundish, avoid local overcooling or overheating, and thus improve the temperature and composition uniformity of the molten steel; the total amount of air blown per hour by the blowing components is 0.5 to 5 times the volume of the molten steel poured per hour; the blowing method is continuous blowing or intermittent blowing; The cross section of the retaining wall is a combination of at least two curved surfaces, and the curvature of the retaining wall is not greater than 0.8; The molten steel flows into the impact zone from the long nozzle. The molten steel in the impact zone churns in the impact zone and is churned and stirred by the gas blown in by the blowing component. During the rising process, the bubbles continuously aggregate and absorb inclusions, and then rise to the slag surface. The molten steel that has been treated by the impact zone and gas flows out from the steel flow hole, and then flows out from the tapping port. The area of ​​the impact zone shall not exceed 95% of the bottom area of ​​the entire inclusion cleaning device; the bottom area of ​​the entire inclusion cleaning device shall not exceed 40% of the bottom area of ​​the entire tundish, and shall not be less than 5%.

2. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The air blowing component is arranged at the middle and lower part of the retaining wall.

3. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The blowing component is a breathable brick, and the gas blown into the blowing component is argon.

4. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The length of the retaining wall shall not exceed 60% of the length between the two ends of the inner wall of the tundish in the direction of the long axis.

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