Impregnation cleaning device for tundish

Abstract

The invention relates to the technical field of continuous casting, in particular to a tundish inclusion cleaning device which comprises an impact area, a retaining wall and a blowing component. The impact area is arranged at the bottom of the tundish and located on the lower side of the long nozzle and directly bears impact of molten steel from the long nozzle. The retaining wall is arranged at the bottom of the tundish in the molten steel outflow direction of the impact area, the two ends of the retaining wall are connected with the tundish wall, the retaining wall and the tundish wall on the side of the impact area form an enclosed space, and steel flowing holes are formed in the retaining wall. And the air blowing part is arranged on the retaining wall and used for blowing air to the molten steel in the enclosed space. According to the method, the dead zone volume between the retaining wall and the impact zone can be reduced, the removal effect of inclusions is improved, the overall quality of molten steel is greatly improved, the method is more suitable for being used in a multi-stream tundish, and the method has the advantages that the production efficiency is remarkably improved, and the product quality stability is remarkably improved.

Description

Technical Field

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

[0002] In the steel smelting process, the tundish is one of the core equipment to ensure the quality of molten steel. The tundish is responsible for transporting the refined molten steel to the casting machine. Its function is not only to maintain the temperature and flow stability of the molten steel, but also to ensure that the molten steel maintains the highest cleanliness during the transportation process. 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, inclusion control in molten steel is particularly critical, because inclusions can significantly affect the mechanical properties, ductility and durability of steel. Clean steel has extremely low tolerance for inclusions, so during the continuous casting process, the removal of inclusions is very strict. In order to achieve this goal, steel producers need efficient tundish cleaning devices to ensure the quality of molten steel, thereby ensuring that the final product can meet strict quality standards. Summary of the invention

[0003] The present invention provides an inclusion cleaning device for a tundish, which aims to improve the traditional tundish structure, optimize the flow state of molten steel, remove inclusions in molten steel, and improve the problem of the influence of inclusions on steel quality in the prior art. By optimizing the removal effect of inclusions, the overall cleanliness of molten steel can be improved.

[0004] The present invention provides an inclusion cleaning device for a tundish, comprising: Impact zone, retaining wall, blowing parts; The impact zone is set at the bottom of the tundish and below the shroud to directly bear the impact of the molten steel from the shroud. 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 connected to the tundish wall at both ends to form an enclosed space with the tundish wall at the side of the impact zone. The retaining wall is provided with a steel flow hole. The air blowing component is arranged on the retaining wall and is used for blowing air into the molten steel in the enclosed space.

[0005] As a preferred solution 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°.

[0006] 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.

[0007] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the air blowing component is arranged in the middle and lower part of the retaining wall.

[0008] As a preferred embodiment of the inclusion cleaning device for the 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.

[0009] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the blowing component is a gas-permeable brick, and the gas blown into the blowing component is argon.

[0010] 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 in a horizontal direction or an oblique upward direction.

[0011] As a preferred embodiment 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.

[0012] As a preferred embodiment of the inclusion cleaning device for a tundish described in 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%.

[0013] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the area of ​​the impact zone does not exceed 95% of the bottom area of ​​the entire inclusion cleaning device.

[0014] 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.

[0015] As a preferred embodiment of the inclusion cleaning device for the 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.

[0016] The beneficial effects of the present invention are as follows: 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 arranged at the bottom of the tundish and located at the lower side of 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 outflow direction of the molten steel in the impact zone and is connected to the tundish wall at both ends, forming an enclosed space with the tundish wall at 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 removal effect of the inclusions, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0018] Figure 1 It is a structural schematic diagram of the inclusion cleaning device of the present invention; Figure 2 is a top cross-sectional view of the inclusion cleaning device of the present invention; Figure 3 is a side cross-sectional view of the inclusion cleaning device of the present invention; Figure 4 It is a cross-sectional view of a tundish equipped with the inclusion cleaning device of the present invention.

[0019] Description of Figure Numbers: 1-impact zone, 2a-retaining wall, 2b-blowing component, 2c-steel flow hole, 3-tundish, 4-steel outlet.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The main purpose of the present invention is to provide an inclusion cleaning device for a tundish, which has the following advantages: (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.

[0023] (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.

[0024] (3) Design of the blowing components: 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.

[0025] (4) By optimizing gas flow and molten steel movement, not only the buoyancy of inclusions is improved, but also the concentration of inclusions in the slag layer is promoted, which greatly improves the removal rate of inclusions. The improvement of cleanliness directly affects the performance of the final product, making the steel perform better in mechanical properties and processability.

[0026] (5) The size of the impact zone and retaining wall can be flexibly adjusted according to the actual size of the tundish, ensuring that the device can work effectively under different production conditions, thereby optimizing the handling of inclusions and improving production adaptability.

[0027] like Figure 1-4 As shown, an embodiment of the present invention provides an inclusion cleaning device for a tundish, comprising: Impact zone 1, retaining wall 2a, blowing part 2b; The impact zone 1 is arranged at the bottom of the tundish 3 and below the long shroud, directly bearing the impact of the molten steel from the long shroud; the impact force of the molten steel is used to promote the rise and separation of inclusions; The retaining wall 2a is arranged at the bottom of the tundish 3 in the direction of the molten steel flowing out of the impact zone 1 and connected to the wall of the tundish 3 at both ends, forming an enclosed space with the wall of the tundish 3 at the side of the impact zone 1, and a steel flow hole 2c is arranged on the retaining wall 2a; The blowing component 2b is arranged on the retaining wall 2a, and is used for blowing air into the molten steel in the enclosed space.

[0028] 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 surfaces of the impact zones 1 of different shapes can be selected according to the needs in practical applications to adapt to different cleaning environments and operating conditions.

[0029] 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 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.

[0030] 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 blowing per hour of the blowing component 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 in the horizontal direction or obliquely upward direction. The design of the blowing component 2b is to use the 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 the effective cleaning of the inside of the tundish 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.

[0031] 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 setting can effectively adapt to tundishes 3 of different sizes, thereby improving the adaptability of the equipment and the flexibility of operation. At the same time, it will also help to reduce production losses caused by size mismatch and improve overall production efficiency. The total area of ​​the blowing component 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 component 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, the appropriate area ratio helps to ensure the 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.

[0032] In one embodiment of 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. The length of the retaining wall 2a does not exceed 60% of the length between the two ends of the inner wall of the tundish 3 in the long axis direction. It is ensured that the inclusion cleaning device does not take up too much space, so that the cleaning process inside the tundish is more efficient and does not interfere with other operations. Adjusting the size of the retaining wall 2a makes the device more adaptable and flexible, and the cleaning effect can be optimized according to actual usage.

[0033] In one embodiment of the present invention, the impact zone area 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 molten steel.

[0034] In one embodiment of the present invention, a gas channel is provided in the blowing part 2b, 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 part 2b includes uniform distribution, concentrated distribution, gradient distribution or staggered distribution. The structural design of the gas channel allows the gas to enter the molten steel in the enclosed space uniformly through the blowing part 2b; the structural design can ensure the uniform distribution of the gas inside the blowing part 2b, thereby improving the cleaning effect of the gas on the molten steel; the uniform gas flow can not only effectively remove the inclusions, but also optimize the flow state of the molten steel, and improve the overall quality and stability of the molten steel.

[0035] 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 inlet, 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.

[0036] 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, the blowing mode is continuous blowing; the total area of ​​the steel flow holes 2c set on the retaining wall 2a is 15% of the area of ​​the retaining wall 2a, and the total area of ​​the blowing parts 2b set 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 bottom area of ​​the entire tundish, and 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 in the long axis direction is 2:7. The area of ​​the impact zone is 80% of the bottom area of ​​the entire inclusion cleaning device. After using the cleaning device, the cleanliness of the molten steel is significantly improved, and the removal rate of inclusions reaches 52.49%. In the tundish that does not use the inclusion cleaning device of this embodiment, the inclusion removal rate is only 39.55%.

[0037] 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 changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied 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 parts; The impact zone is set at the bottom of the tundish and below the shroud to directly bear the impact of the molten steel from the shroud. The top surface of the impact zone is a plane, a slope or an arc surface; 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 connected to the tundish wall at both ends to form an enclosed space with the tundish wall at the side of the impact zone. The retaining wall is provided with a steel flow hole. The air blowing component is arranged on the retaining wall and is used for blowing air into the molten steel in the enclosed space.

2. The inclusion cleaning device for a tundish according to claim 1, characterized in that: 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.

3. 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.

4. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The total amount of air blown per hour by the blowing component is 0.5 to 5 times the volume of the molten steel poured per hour; the blowing method is continuous blowing or intermittent blowing.

5. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The blowing component is a breathable brick, the gas blown into the blowing component is argon gas, and the direction of the air flow blown into the blowing component is along the horizontal direction or the oblique upward direction.

6. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The total area of ​​the flow steel holes set on the retaining wall shall not exceed 30% of the area of ​​the retaining wall; the total area of ​​the blowing components set on the retaining wall shall not exceed 45% of the area of ​​the retaining wall.

7. The inclusion cleaning device for a tundish according to claim 1, characterized in that: 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%.

8. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The impact zone area does not exceed 95% of the entire bottom area of ​​the inclusion cleaning device.

9. 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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