Sealing protection device for tundish impact area of continuous casting aluminum killed steel

Abstract

The utility model discloses a sealing protection device for an impact area of a continuous casting aluminum killed steel tundish, which belongs to the technical field of metallurgical continuous casting and comprises an argon blowing pipe arranged in the impact area of the tundish, an aerial fog nozzle is arranged on the argon blowing pipe facing the pouring side, the argon blowing pipe is connected with a gas supply pipeline through a connecting pipe, and the connecting pipe is connected with a gas supply pipeline. The gas supply pipeline is communicated with an external gas source, and a stop valve, a purification triple piece, a pressure reducing valve and a pressure gauge are sequentially arranged on the gas supply pipeline in the gas flow direction. According to the utility model, an air curtain is formed to play a role in sealing and protecting atomization, molten steel is prevented from being secondarily polluted in a pouring process, and the advantages of protecting pouring are that the molten steel is prevented from being contacted with air in the pouring process, the content of inclusions caused by oxidation of the molten steel is reduced, the liquidity of the molten steel is improved, and the quality of a casting blank is improved.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical continuous casting technology, and particularly relates to a sealing and protection device for the impact zone of the ladle in continuous casting of aluminum killed steel. Background Technology

[0002] In the continuous casting of aluminum-killed steel, tundish nozzle blockage is a major problem plaguing steel mills. During the casting process, molten steel "churns" as it is poured from the ladle into the impact zone of the tundish. This is because metallic Al in the molten steel undergoes a secondary oxidation reaction with oxygen from the air, producing Al2O3. This Al2O3, a secondary oxidation product, condenses and grows, causing the nozzle diameter to continuously shrink. This accumulation on the inner wall of the nozzle leads to blockage and turbulence accidents at the tundish nozzle. Unstable liquid levels not only cause billet re-joining and numerous defects such as scaling, but can also lead to unplanned casting shutdowns, disrupting the steel mill's production schedule and reducing casting machine output. When casting aluminum-killed steel or other steels containing high levels of easily oxidized elements, the molten steel is secondary contaminated during the casting process. Secondary oxidation of the molten steel is a major source of large inclusions in the steel. Inadequate protection will result in defects such as hairline cracks, delamination, and cracking in the rolled product, while also reducing the quality and fluidity of the molten steel and the recovery rate of alloying elements. Summary of the Invention

[0003] To address the problems existing in the prior art, this utility model provides a sealing and protection device for the impact zone of the ladle in continuous casting of aluminum killed steel. It can achieve a sealing and protection atomization effect by forming an air curtain, avoiding secondary contamination of molten steel during the casting process. The benefits of protecting the casting process are that it prevents molten steel from contacting air, reduces the content of inclusions caused by steel oxidation, improves the fluidity of molten steel, and improves the quality of the cast billet.

[0004] This utility model is implemented as follows: a sealing and protection device for the impact zone of the tundish in continuous casting of aluminum killed steel includes an argon blowing pipe installed in the impact zone of the tundish. An aerosol nozzle is installed on the argon blowing pipe facing the casting side. The argon blowing pipe is connected to a gas supply pipeline through a connecting pipe. The gas supply pipeline is connected to an external gas source. A shut-off valve, a purification triplet, a pressure reducing valve, and a pressure gauge are sequentially installed on the gas supply pipeline along the gas flow direction. Argon gas can be injected into the impact zone of the tundish through an argon blowing pipe installed in the tundish impact zone and aerosol nozzles facing the casting side. As an inert gas, argon effectively isolates the molten steel from oxygen in the air, thereby reducing secondary oxidation of the molten steel. The shut-off valve allows operators to easily control the gas flow, adjusting the argon blowing pipe's spray pattern as needed. The purification triplet (typically including a filter, pressure reducing valve, and oil mist lubricator) removes impurities and moisture from the gas, ensuring the gas supplied to the argon blowing pipe is pure. This helps reduce contamination and defects during casting, improving the quality of the molten steel and the purity of the billet. The pressure reducing valve regulates the gas pressure, keeping it within a suitable range. Stable pressure helps ensure the argon blowing pipe sprays gas at a constant speed and flow rate, effectively sealing and protecting the tundish impact zone. The pressure gauge allows operators to monitor the gas pressure in the supply pipeline in real time, helping to promptly detect and handle abnormal pressure situations, ensuring the safe operation of the equipment.

[0005] Furthermore, the shape of the argon blowing tube matches the outer contour of the impact zone of the intermediate package, including a horizontal section and inclined sections on both sides of the horizontal section, which are connected by connecting fittings. Matching the shape of the argon blowing tube to the outer contour of the impact zone ensures a more uniform distribution of argon gas within the impact zone, preventing excessive concentration or absence of gas in a particular area, thus improving the sealing effect. The argon blowing tube adopts a segmented structural design; by adjusting the length of the horizontal and inclined sections and the angle of the connecting fittings, the shape of the argon blowing tube can be flexibly customized to meet various production needs. Adjusting the angle and length of each section optimizes the gas flow path, ensuring a more uniform gas distribution within the impact zone and improving the sealing effect. The connection between the sections via connecting fittings makes installation and disassembly more convenient and faster, reducing maintenance costs and time. The connecting fittings prevent deformation or damage at bends, providing high strength and stability.

[0006] Furthermore, an airflow regulating hood is fitted onto the outlet end of the aerosol nozzle. This airflow regulating hood is snapped onto the outlet end of the aerosol nozzle and can rotate around its outer circumference. An airflow channel is provided at the outlet end of the airflow regulating hood, and this channel is connected to the outlet end of the aerosol nozzle. The gas flow direction of the airflow channel is set at an acute angle to the gas flow direction of the aerosol nozzle. The airflow regulating hood can be rotated and adjusted according to actual needs, thereby precisely controlling the spray direction and range of the airflow to meet different requirements. This optimizes the airflow distribution, making the gas more evenly distributed in the pouring area.

[0007] Furthermore, the connecting section of the horizontal and inclined sections is threadedly connected to a connecting pipe fitting, and a sealing ring is provided inside the connecting pipe fitting. The sealing ring, installed inside the connecting pipe fitting, can fill the gaps in the connecting fitting through compression deformation, thereby achieving a sealing effect and effectively preventing gas leakage at the connection point, ensuring the sealing performance of the argon blowing pipe.

[0008] Furthermore, the connecting pipe fitting is equipped with reinforcing ribs at the bending positions. These ribs can distribute bending stress, reduce stress concentration at the bending point, optimize the stress distribution inside the connecting pipe fitting, and make the stress more uniform, thus ensuring its stability and reliability during long-term operation.

[0009] Furthermore, multiple aerosol nozzles are provided, and the multiple aerosol nozzles are arranged on the same mounting surface and are distributed at equal intervals.

[0010] Furthermore, the pressure gauge displays a range of 0.2–0.4 MPa.

[0011] The advantages and technical effects of this utility model are as follows: By adopting the above-mentioned technical solution, an air curtain is formed to achieve a sealing and protective atomization effect, avoiding secondary contamination of molten steel during the pouring process. The benefit of this protective pouring process is that it prevents molten steel from contacting air, reducing the content of inclusions caused by steel oxidation, improving the fluidity of molten steel, and improving the quality of the cast billet. The enhanced sealing effect solves the serious problem of secondary oxidation of molten steel in the ladle impact zone during aluminum-killed casting start-up, improving the quality of the cast billet while ensuring the safe and stable production of the casting machine. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model;

[0013] Figure 2 This is a schematic diagram of the argon blowing tube structure provided in an embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of the aerosol nozzle structure provided in an embodiment of the present invention.

[0015] In the diagram: 1. Impact zone of the central packaging; 2. Argon blowing tube; 2-1. Horizontal section; 2-2. Inclined section; 3. Aerosol nozzle; 4. Connecting pipe; 5. External gas source; 6. Shut-off valve; 7. Purification triplet; 8. Pressure reducing valve; 9. Pressure gauge; 10. Connecting fittings; 10-1. Reinforcing rib; 11. Airflow regulating hood; 11-1. Airflow channel. Detailed Implementation

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figures 1 to 3As shown, this application provides a sealing and protection device for the impact zone of the tundish in continuous casting of aluminum killed steel. It includes an argon blowing pipe 2 installed in the impact zone 1 of the tundish. An aerosol nozzle 3 is installed on the argon blowing pipe 2 facing the casting side. Further, multiple aerosol nozzles 3 are provided, arranged on the same mounting surface and equidistantly distributed. The argon blowing pipe 2 is flexibly connected to a gas supply pipeline via a connecting pipe 4. The gas supply pipeline is connected to an external gas source 5. Along the gas flow direction, a shut-off valve 6, a purification triplet 7, a pressure reducing valve 8, and a pressure gauge 9 are sequentially installed on the gas supply pipeline. Further, the pressure gauge 9 displays a range of 0.2–0.4 MPa. Argon gas can be injected into the impact zone 1 of the tundish through the argon blowing pipe 2 and the aerosol nozzle 3 facing the casting side. As an inert gas, argon gas can effectively isolate the molten steel from oxygen in the air, thereby reducing secondary oxidation of the molten steel. The shut-off valve 6 allows the operator to easily control the gas flow and adjust the jetting state of the argon blowing pipe 2 as needed. The purification triplet 7 (usually including a filter, pressure reducing valve 8, and oil mist lubricator) can remove impurities and moisture from the gas, ensuring that the gas supplied to the argon blowing pipe 2 is pure, which helps to reduce contamination and defects during the casting process and improve the quality of the molten steel and the purity of the billet. The pressure reducing valve 8 can regulate the gas pressure and keep it within a suitable range. Stable pressure helps ensure that the argon blowing pipe 2 injects gas at a constant speed and flow rate, thereby achieving effective sealing and protection of the impact zone 1 of the tundish. The pressure gauge 9 allows the operator to monitor the gas pressure in the gas supply pipeline in real time, which helps to detect and deal with abnormal pressure in a timely manner and ensure the safe operation of the equipment.

[0019] Furthermore, the shape of the argon blowing tube 2 matches the outer contour of the intermediate package impact zone 1, including a horizontal section 2-1 and inclined sections 2-2 arranged on both sides of the horizontal section 2-1. The horizontal section 2-1 and the inclined section 2-2 are connected by a connecting fitting 10. The shape of the argon blowing tube 2 matches the outer contour of the intermediate package impact zone 1, which can ensure that the argon gas is more evenly distributed in the intermediate package impact zone 1, avoiding excessive concentration or lack of gas in a certain area, thereby improving the sealing and protection effect. The argon blowing tube 2 adopts a segmented structural design. By adjusting the length of the horizontal section 2-1 and the inclined section 2-2 and the angle of the connecting fitting 10, the shape of the argon blowing tube 2 can be flexibly customized to meet various production needs. Furthermore, by adjusting the angle and length of each segment, the gas flow path can be optimized, ensuring that the gas is more evenly distributed in the intermediate package impact zone 1, improving the sealing effect. The segments are connected by the connecting fitting 10, making installation and disassembly more convenient and quick, reducing maintenance costs and time. The bends at the connection points of the connecting fitting 10 are not prone to deformation or damage, and have high strength and stability. Furthermore, the connecting section of the horizontal section 2-1 and the inclined section 2-2 is threadedly connected to the connecting pipe fitting 10, and a sealing ring is provided inside the connecting pipe fitting 10. The sealing ring, installed inside the connecting pipe fitting 10, can fill the gap in the connector through compression deformation, thereby achieving a sealing effect and effectively preventing gas leakage at the connection point, ensuring the sealing performance of the argon blowing pipe 2. Furthermore, a reinforcing rib 10-1 is provided at the bending position of the connecting pipe fitting 10. The reinforcing rib 10-1 can distribute bending stress, reduce stress concentration at the bending point, optimize the stress distribution inside the connecting pipe fitting 10, making it more uniformly stressed, and ensuring its stability and reliability during long-term operation.

[0020] Furthermore, an airflow regulating cover 11 is fitted onto the outlet end of the aerosol nozzle 3. The airflow regulating cover 11 is snapped onto the outlet end of the aerosol nozzle 3 and can rotate around the outer circumference of the outlet end. An airflow channel 11-1 is provided at the outlet end of the airflow regulating cover 11, which is connected to the outlet end of the aerosol nozzle 3. The gas flow direction of the airflow channel 11-1 is set at an acute angle to the gas flow direction of the aerosol nozzle 3. The airflow regulating cover 11 can be rotated and adjusted according to actual needs, thereby precisely controlling the spray direction and range of the airflow to meet different requirements. This can optimize the airflow distribution and make the gas more evenly distributed in the pouring area.

[0021] By employing the above technical solution, an air curtain is formed to achieve a sealing and protective atomization effect, preventing secondary contamination of the molten steel during the pouring process. This protective pouring process avoids contact between the molten steel and air, reducing the content of inclusions caused by steel oxidation, improving steel fluidity, and enhancing billet quality. The strengthened sealing effect solves the problem of severe secondary oxidation of molten steel in the ladle impact zone 1 during aluminum-killed casting start-up, improving billet quality while ensuring safe and stable production of the casting machine.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing and protection device for the impact zone of a continuously cast aluminum killed steel ladle, characterized in that, It includes an argon blowing pipe installed in the impact zone of the intermediate package. An aerosol nozzle is installed on the argon blowing pipe facing the casting side. The argon blowing pipe is connected to the gas supply pipeline through a connecting pipe. The gas supply pipeline is connected to an external gas source. A shut-off valve, a purification triplet, a pressure reducing valve, and a pressure gauge are installed sequentially along the gas flow direction on the gas supply pipeline.

2. The sealing and protection device for the impact zone of the ladle in continuous casting of killed aluminum steel according to claim 1, characterized in that, The shape of the argon blowing tube matches the outer contour of the impact zone of the middle package, including a horizontal section and inclined sections arranged on both sides of the horizontal section, and the horizontal section and the inclined section are connected by connecting pipe fittings.

3. The sealing and protection device for the impact zone of the ladle in continuous casting of killed aluminum steel according to claim 1 or 2, characterized in that, The air outlet end of the aerosol nozzle is fitted with an airflow regulating cover. The airflow regulating cover is snapped onto the air outlet end of the aerosol nozzle and can rotate around the outer circumference of the air outlet end. The air outlet end of the airflow regulating cover is provided with an airflow channel. The airflow channel is connected to the air outlet end of the aerosol nozzle. The gas flow direction of the airflow channel is set at an acute angle to the gas flow direction of the aerosol nozzle.

4. The sealing and protection device for the impact zone of the ladle in continuous casting of killed aluminum steel according to claim 2, characterized in that, The connecting section of the horizontal section and the inclined section is threadedly connected to the connecting pipe fitting, and a sealing ring is provided inside the connecting pipe fitting.

5. The sealing and protection device for the impact zone of the ladle in continuous casting of killed aluminum steel according to claim 2, characterized in that, The connecting pipe fitting is equipped with reinforcing ribs at the bends.

6. The sealing and protection device for the impact zone of the ladle in continuous casting of killed aluminum steel according to claim 1, characterized in that, The aerosol nozzles are provided in multiple ways, and the multiple aerosol nozzles are arranged on the same mounting surface and distributed at equal intervals.

7. The sealing and protection device for the impact zone of the ladle in continuous casting of killed aluminum steel according to claim 1, characterized in that, The pressure gauge displays a range of 0.2 to 0.4 MPa.

Images