A device for cleaning impurities in intermediate packages

Abstract

This invention relates to the field of continuous casting technology, specifically to a device for cleaning inclusions in a tundish, comprising an impact-bearing component, a flow-guiding component, and an air-blowing component. The impact-bearing component is located at the bottom of the tundish and below the long nozzle. The flow-guiding component has a hole on its top surface that matches the horizontal cross-section of the impact-bearing component. The flow-guiding component is fastened above the impact-bearing component, and the edge of the hole on its top surface is connected to the top edge of the side surface of the impact-bearing component. A flow hole is provided on the side surface of the flow-guiding component, and an opening is provided around the hole on the top surface of the flow-guiding component. Molten steel overflowing from the impact-bearing component flows into the area between the side surface of the impact-bearing component and the side surface of the flow-guiding component through the opening on the top surface of the flow-guiding component, and then flows out through the flow hole, thereby optimizing the flow of molten steel and the treatment of inclusions. This invention not only improves the cleanliness of the molten steel but also ensures the stability and consistency of the molten steel quality.

Description

Technical Field

[0001] This invention relates to the field of continuous casting technology, specifically to a device for cleaning inclusions in an tundish. Background Technology

[0002] In steel production, the tundish, as a crucial transitional device between the ladle and the crystallizer for pouring molten steel, plays a vital role in the final steel quality. During transport, the molten steel in the tundish may generate inclusions, such as non-metallic particles, which negatively impact the mechanical properties of the steel, reduce its cleanliness, and lead to product defects. The cleanliness of molten steel is a key indicator for evaluating steel product quality, especially in high-end steel products and special-purpose steels, where cleanliness is critical to the performance and reliability of the final product. Improving the cleanliness of molten steel necessitates increasing the inclusion removal rate. The inclusion removal rate refers to the efficiency of removing inclusions from molten steel during steel production through specific process measures, such as stirring and argon blowing. Traditional tundish structures cannot adequately remove inclusions, thus affecting the inclusion removal rate and the quality of the molten steel. Summary of the Invention

[0003] This invention provides an inclusion cleaning device for tundishes to solve the problem of inclusions affecting steel quality in existing tundish metallurgical technology. Through structural design optimization, the flow path of molten steel in the tundish is adjusted to improve the purification capacity and cleanliness of molten steel, thereby ensuring the stability and consistency of molten steel quality.

[0004] This invention provides a device for cleaning impurities in intermediate treasuries, comprising: Impact-affected components, flow guiding components, air blowing components; The impact-bearing component is a cylindrical structure with one end open, formed by the bottom and side surfaces. It is located at the bottom of the tundish and below the long nozzle, directly bearing the impact of the molten steel from the long nozzle. The flow guiding component is a cylindrical structure formed by a top surface and a side surface. The top surface has a hole that matches the horizontal cross-section of the impacted component. The flow guiding component is fastened above the impacted component, and the edge of the hole on the top surface is connected to the top of the side surface of the impacted component. The side surface of the flow guiding component is located at the bottom of the tundish, forming the outer boundary of the inclusion cleaning device. The side surface of the flow guiding component has a steel flow hole that is perpendicular to the side surface of the flow guiding component or inclined upward in the horizontal direction. The hole on the top surface of the flow guiding component is surrounded by an opening. The molten steel overflowing from the impacted component flows into the area between the side surface of the impacted component and the side surface of the flow guiding component through the opening on the top surface of the flow guiding component, and then flows out through the steel flow hole, which can optimize the flow of molten steel and the treatment of inclusions. The air blowing component is located in the bottom area of ​​the tundish between the side of the impacted component and the side of the flow guiding component. The surface of the air blowing component has an air outlet for blowing air into the molten steel in the tundish; it can effectively enhance the cleaning effect of the molten steel.

[0005] As a preferred embodiment of the impurity cleaning device for intermediate packages according to the present invention, the top surface of the guide member is inclined downward in the horizontal direction relative to the side it is connected to, and the inclination angle is not less than 5°.

[0006] As a preferred embodiment of the inclusion cleaning device for tundish described in this invention, the blowing component is provided with a gas channel connected to a gas supply device for blowing external gas into the molten steel in the tundish; the molten steel overflows from the impacted component and enters the blowing area, where it is churned by bottom-blown gas; the bottom-blown gas in the blowing area can continuously churn the molten steel, forming an effective gas flow; this gas flow can not only help the inclusions carried by the molten steel rise to the slag layer, but also promote uniform mixing inside the molten steel, thereby improving the overall cleanliness and treatment effect of the molten steel.

[0007] As a preferred embodiment of the inclusion cleaning device for tundish according to the present invention, the gas channels of the blowing component are distributed in a uniform, concentrated, gradient, or staggered manner. The structural design of the gas channels allows gas to enter the tundish uniformly through the blowing component; this structural design ensures uniform gas distribution within the blowing component, thereby improving the cleaning effect of the gas on the molten steel; 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.

[0008] As a preferred embodiment of the inclusion cleaning device for tundish described in this invention, the blowing component adopts either vertical blowing or oblique blowing. Vertical blowing refers to the gas being blown directly upwards into the molten steel along the vertical axis of the blowing component, thereby achieving uniform gas distribution. Oblique blowing involves the gas being blown in at an oblique upward angle, with the angle between the oblique upward direction and the bottom surface of the tundish not less than 10°. This method can more effectively adjust the direction and speed of gas flow to optimize the mixing and cleaning effect of the molten steel. The choice between these two blowing methods can be adjusted according to specific process requirements to achieve the best molten steel treatment effect.

[0009] In a preferred embodiment of the inclusion cleaning device for tundishes according to the present invention, the air blowing component is a permeable brick, and the total air blowing volume of the air blowing component is related to the volume of molten steel. The total air blowing volume of the air blowing component per hour is 0.5 to 5 times the volume of molten steel poured per hour. The gas blown in by the air blowing component is argon.

[0010] In a preferred embodiment of the impurity cleaning device for tundishes according to the present invention, the dimensions of the flow guiding component are adjusted according to the dimensions of different tundishes. The bottom area of ​​the space enclosed by the sides of the flow guiding component, i.e., the bottom area of ​​the impurity cleaning device, is no higher than 50% and no lower than 10% of the total bottom area of ​​the tundish; the length of the outer major axis of the flow guiding component, i.e., the length of the major axis of the impurity cleaning device, does not exceed 60% of the length between the two ends of the major axis of the inner wall of the tundish, ensuring that the size of the impurity cleaning device is not too large, avoiding problems such as decreased operating efficiency or uneven gas flow. Furthermore, a reasonable space also helps to better control and manage gas flow and cleaning effect, ensuring effective cleaning of the tundish. The thickness of the sides of the flow guiding component can be adjusted as needed, ranging from 5% to 40% of the length of the outer major axis of the flow guiding component.

[0011] The beneficial effects of this invention are as follows: This invention provides a device for cleaning inclusions in an tundish, comprising an impact-bearing component, a flow-guiding component, and an air-blowing component. The impact-bearing component is a cylindrical structure with one open end, formed by a bottom surface and a side surface, disposed at the bottom of the tundish and located below the long nozzle, directly bearing the impact of molten steel from the long nozzle. The flow-guiding component is a cylindrical structure formed by a top surface and a side surface, with a hole on the top surface matching the horizontal cross-section of the impact-bearing component. The flow-guiding component is fastened above the impact-bearing component, and the edge of the hole on the top surface is connected to the top end of the side surface of the impact-bearing component. The side surface of the flow-guiding component is disposed at the bottom of the tundish, forming the exterior of the inclusion-cleaning device. The invention features a flow guide component with flow holes perpendicular to or inclined upwards in the horizontal direction on its side. Openings surround the holes on the top surface of the flow guide component. Molten steel overflowing from the impacted component flows into the area between the side of the impacted component and the side of the flow guide component through the openings on the top surface of the flow guide component, and then flows out through the flow holes. This optimizes the flow pattern of the molten steel and the removal of inclusions. An air blowing component is located at the bottom of the tundish between the side of the impacted component and the side of the flow guide component. The air blowing component has an air outlet on its surface for blowing air into the molten steel in the tundish, effectively enhancing the cleaning effect of the molten steel. This invention not only improves the cleanliness of the molten steel but also ensures the stability and consistency of the molten steel quality, making it more suitable for use in single-flow or dual-flow tundishes, providing an efficient solution for the steel production process. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of the impurity cleaning device of the present invention; Figure 2 This is a schematic diagram of the bottom of the debris cleaning device of the present invention; Figure 3 This is a cross-sectional view of the debris cleaning device of the present invention; Figure 4 A cross-sectional view of an intermediate package equipped with the inclusion cleaning device of the present invention.

[0014] Explanation of icon numbers: 1-Impact component, 2a-Flow guiding component, 2b-Steel flow hole, 2c-Air blowing component, 3-Tundish, 4-Steel outlet.

[0015] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0016] The technical solutions described below in conjunction with the embodiments will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] The main objective of this invention is to provide a device for cleaning impurities in intermediate treasuries, which has the following advantages: (1) Impact-affected component design: The impact-affected component is located on the lower side of the long nozzle and directly bears the impact force of the molten steel, which promotes the full collision and aggregation of inclusions, improves the efficiency of inclusion removal, and ensures that the molten steel is more uniform and clean.

[0018] (2) Design of flow guiding components: The structural design of the flow guiding components adjusts the flow path of molten steel in the tundish, and the size of the flow guiding components can be flexibly adjusted according to the actual size of the tundish, ensuring that they can work effectively under different production conditions, thereby optimizing the handling of inclusions and improving the adaptability of production.

[0019] (3) Air blowing component design: The external gas is blown in evenly through the air blowing component to form a continuous turbulent flow, which drives the inclusions to rise to the slag layer, thereby significantly improving the cleanliness of the molten steel.

[0020] (4) Airflow control: The blowing component supports vertical or oblique blowing mode. The tilt angle design makes the gas flow more uniform. The air hole distribution technology and flow control can realize the precise adjustment of gas distribution, enhance the flow effect of gas in molten steel, and improve the overall quality stability.

[0021] (5) By combining the flow guiding component and the air blowing component, a double air blowing layer is formed, which effectively prevents the generation of dead zone volume, ensures that the flow of molten steel in the tundish is more uniform, improves the stability and consistency of molten steel quality, and helps to improve the processing efficiency of inclusions and the overall cleanliness.

[0022] like Figure 1-4 As shown, an embodiment of the present invention provides a device for cleaning impurities in intermediate packages, comprising: Impact-affected component 1, flow guiding component 2a, air blowing component 2c; The impact-bearing component 1 is a cylindrical structure with one end open, formed by the bottom and side surfaces. It is located at the bottom of the tundish 3 and below the long nozzle, directly bearing the impact of the molten steel from the long nozzle. The flow guiding component 2a is a cylindrical structure formed by a top surface and a side surface. The top surface has a hole that matches the horizontal cross-section of the impacted component 1. The flow guiding component 2a is fastened above the impacted component 1, and the edge of the hole on the top surface is connected to the top of the side surface of the impacted component 1. The side surface of the flow guiding component 2a is located at the bottom of the tundish 3, forming the outer boundary of the inclusion cleaning device. The side surface of the flow guiding component 2a has a steel flow hole 2b that is perpendicular to the side surface of the flow guiding component 2a or inclined upward in the horizontal direction. The hole on the top surface of the flow guiding component 2a has an opening around it. The molten steel overflowing from the impacted component 1 flows into the area between the side surface of the impacted component 1 and the side surface of the flow guiding component 2a through the opening on the top surface of the flow guiding component 2a, and then flows out through the steel flow hole 2b. This can optimize the flow of molten steel and the treatment of inclusions. The air blowing component 2c is located in the bottom area of ​​the tundish 3 between the side of the impacted component 1 and the side of the flow guiding component 2a. The surface of the air blowing component 2c has an air outlet for blowing air into the molten steel in the tundish 3; it can effectively enhance the cleaning effect of the molten steel.

[0023] In one embodiment of the present invention, the top view cross section of the impacted component 1 is circular or elliptical; the top view cross section of the guide component 2a is circular or elliptical.

[0024] In one embodiment of the present invention, the top surface of the flow guide 2a is inclined downward in the horizontal direction relative to the side it is connected to, and the inclination angle is not less than 5°.

[0025] In one embodiment of the present invention, the blowing component 2c is provided with a gas channel connected to a gas supply device for blowing external gas into the molten steel in the tundish 3; the molten steel overflows from the impact component 1 and enters the blowing area, where it is churned by the bottom-blown gas; the bottom-blown gas in the blowing area can continuously churn the molten steel, forming an effective gas flow; this gas flow can not only help the inclusions carried by the molten steel rise to the slag layer, but also promote uniform mixing inside the molten steel, thereby improving the overall cleanliness and treatment effect of the molten steel.

[0026] In one embodiment of the present invention, the gas channels of the blowing component 2c are distributed in a uniform, concentrated, gradient, or staggered manner. The structural design of the gas channels allows gas to enter the tundish 3 uniformly through the blowing component 2c; this structural design ensures uniform gas distribution inside the blowing component 2c, thereby improving the cleaning effect of the gas on the molten steel; uniform gas flow can not only effectively remove inclusions, but also optimize the flow state of the molten steel, improving the overall quality and stability of the molten steel.

[0027] In one embodiment of the present invention, the blowing component 2c adopts a vertical blowing method or an oblique blowing method; vertical blowing refers to the gas being blown directly upward into the molten steel along the vertical axis of the blowing component, thereby achieving uniform gas distribution; oblique blowing refers to the gas being blown in at an oblique upward angle, with the oblique upward direction forming an angle of not less than 10° with the bottom surface of the tundish 3. This method can more effectively adjust the direction and speed of gas flow to optimize the mixing and cleaning effect of the molten steel; the choice between these two blowing methods can be adjusted according to specific process requirements to achieve the best molten steel treatment effect.

[0028] In one embodiment of the present invention, the air blowing component 2c is a permeable brick, and the total air flow rate of the air blowing component 2c is related to the amount of molten steel. The total air blowing volume of the air blowing component 2c per hour is 0.5 to 5 times the volume of molten steel poured per hour. The gas blown in by the air blowing component 2c is argon. The pore distribution pattern and flow control of the air blowing component 2c can precisely adjust the gas distribution, enhance the gas distribution effect, and improve the quality stability of the molten steel.

[0029] In one embodiment of the present invention, the size of the flow guiding component 2a is adjusted according to the size of different intermediate tundishes 3. The bottom area of ​​the space enclosed by the sides of the flow guiding component 2a, i.e., the bottom area of ​​the inclusion cleaning device (including the area occupied by the bottom surface of the impacted component 1), does not exceed 50% of the bottom area of ​​the entire intermediate tundish 3 and is not less than 10% of the bottom area of ​​the entire intermediate tundish 3; the outer long axis length of the flow guiding component 2a, i.e., the length of the inclusion cleaning device, does not exceed 60% of the length between the two ends of the long axis of the inner wall of the intermediate tundish 3, ensuring that the size of the inclusion cleaning device is not too large, avoiding problems such as decreased operating efficiency of the inclusion cleaning device or uneven gas flow. In addition, reasonable space also helps to better control and manage gas flow and cleaning effect, ensuring effective cleaning of the intermediate tundish. The thickness of the sides of the flow guiding component can be adjusted as needed, ranging from 5% to 40% of the outer long axis length of the flow guiding component 2a.

[0030] In this invention, the inclusion cleaning device for tundishes involves molten steel flowing into the impacted component 1 from the long nozzle. Molten steel overflowing from the impacted component 1 flows through an opening on the top surface of the guide component 2a into the area between the side of the impacted component 1 and the side of the guide component 2a, and then flows out through the steel flow hole 2b. Gas within the blowing component 2c is evenly distributed through a designed airflow channel, forming bubbles that agitate the molten steel. As the bubbles rise, they continuously aggregate and adsorb inclusions. Some bubbles rise to the slag surface through the opening on the top surface of the guide component 2a, while others flow out through the steel flow hole 2b on the side of the guide component 2a, forming a double-layer blowing layer. This process not only increases the buoyancy of inclusions but also promotes the mixing of the molten steel, improving the overall cleanliness of the molten steel. With the continuous agitation of the gas, inclusions are effectively carried to the slag layer, reducing their content in the molten steel. The molten steel then flows out from the outlet 4.

[0031] In one embodiment of the present invention, the bottom area of ​​the inclusion cleaning device occupies 32% of the bottom area of ​​the tundish, the ratio of the length of the outer long axis of the guide component to the length of the two ends of the inner long axis of the tundish wall is 3:8, and the top surface of the guide component is inclined downward in the horizontal direction relative to the side it is connected to, with an inclination angle of 7°. After using the inclusion cleaning device, the cleanliness of the molten steel is significantly improved, and the inclusion removal rate reaches 42.27%. In contrast, in the tundish without the inclusion cleaning device of this embodiment, the inclusion removal rate is only 31.19%.

[0032] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An inclusion cleaning device for a single- or double-flow tundish, characterized in that, include: Impact-affected components, flow guiding components, air blowing components; The impact-bearing component is a cylindrical structure with one end open, formed by the bottom and side surfaces. It is located at the bottom of the tundish and below the long nozzle, directly bearing the impact of the molten steel from the long nozzle. The flow guiding component is a cylindrical structure formed by a top surface and two sides. The top surface has a hole matching the horizontal cross-section of the impacted component. The flow guiding component is fastened above the impacted component, and the edge of the hole on the top surface connects to the top edge of the side surface of the impacted component. The side surface of the flow guiding component is located at the bottom of the tundish and outside the side surface of the impacted component, forming the outer boundary of the inclusion cleaning device. The side surface of the flow guiding component has a flow hole perpendicular to the side surface or inclined upwards in the horizontal direction. An opening is provided around the hole on the top surface of the flow guiding component, allowing molten steel overflowing from the impacted component to flow into the impacted component through the opening on the top surface of the flow guiding component. The steel flows out through the flow hole after passing through the area between the side of the impact component and the side of the guide component; the top surface of the guide component is inclined downwards in the horizontal direction relative to the side it is connected to, and the inclination angle is not less than 5°; the bottom area of ​​the space enclosed by the side of the guide component is not higher than 50% and not less than 10% of the bottom area of ​​the entire tundish; the length of the outer long axis of the guide component does not exceed 60% of the length between the two ends of the long axis of the inner wall of the tundish; the thickness of the side of the guide component is 5~40% of the length of the outer long axis of the guide component; the structural design of the guide component adjusts the flow path of the molten steel in the tundish; The air blowing component is located in the bottom area of ​​the tundish between the side of the impacted component and the side of the guide component. The surface of the air blowing component has an air outlet for blowing air into the molten steel in the tundish. The air blowing component adopts a vertical or oblique blowing method. The total air blowing volume of the air blowing component per hour is 0.5 to 5 times the volume of molten steel poured per hour. By combining the flow guiding components and the air blowing components, a double air blowing layer is formed, which effectively prevents the formation of dead zone volume, ensures more uniform flow of molten steel in the tundish, improves the stability and consistency of molten steel quality, and helps to improve the efficiency of inclusion treatment and overall cleanliness.

2. The device for cleaning inclusions in single-flow or dual-flow tundishes according to claim 1, characterized in that, The blowing component has a gas channel connected to the gas supply device, which is used to blow external gas into the molten steel in the tundish.

3. The impurity cleaning device for single-flow or dual-flow tundishes according to claim 2, characterized in that, The gas channels of the blowing component can be distributed in a uniform, concentrated, gradient, or staggered manner.

4. The impurity cleaning device for single-flow or dual-flow tundishes according to claim 1, characterized in that, The air-blowing component is made of breathable bricks.

5. The impurity cleaning device for single-flow or dual-flow tundishes according to claim 1, characterized in that, The gas blown in by the blowing component is argon.

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