Impregnation cleaning device for tundish

Abstract

The invention relates to the technical field of continuous casting, in particular to an inclusion cleaning device for a tundish, which comprises an impacted component, a flow guide component and an air blowing component, the impacted part is arranged at the bottom of the tundish and located on the lower side of the long nozzle. A hole matched with the horizontal section of the impacted component is formed in the top face of the flow guide component, the flow guide component is buckled above the impacted component, and the edge of the hole formed in the top face is connected with the top end of the side face of the impacted component. A steel flowing hole is formed in the side face of the flow guide component, openings are formed in the periphery of a hole formed in the top face of the flow guide component, molten steel overflowing from the impacted component flows into the area between the side face of the impacted component and the side face of the flow guide component from the openings formed in the top face of the flow guide component and then flows out of the steel flowing hole, and optimization of molten steel flowing and inclusion treatment is achieved. According to the invention, not only is the cleanliness of the molten steel improved, but also the stability and consistency of the quality of the molten steel are ensured.

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 production process, the tundish is the key transition device for pouring molten steel between the ladle and the crystallizer, and its performance is crucial to the final steel quality. The molten steel in the tundish may produce inclusions during transportation. These inclusions, such as non-metallic particles, will have a negative impact on the mechanical properties of the steel, reduce the cleanliness of the molten steel, and cause product defects. The cleanliness of molten steel is one of the important indicators for evaluating the quality of steel products, especially in high-end steel products and special-purpose steels. Cleanliness is crucial to the performance and reliability of the final product. Improving the cleanliness of molten steel is bound to increase the inclusion removal rate. The inclusion removal rate refers to the efficiency of removing inclusions from molten steel through specific process measures such as stirring and argon blowing during the steel production process. The traditional tundish structure cannot fully achieve the removal of inclusions, which affects the inclusion removal rate and the quality of molten steel. Summary of the invention

[0003] The present invention provides an inclusion cleaning device for a tundish, which is used to solve the problem that inclusions affect steel quality in the existing tundish metallurgical technology. By optimizing the structural design, the flow route of molten steel in the tundish is adjusted, the purification capacity of the molten steel in the tundish and the cleanliness of the molten steel are improved, thereby ensuring the stability and consistency of the molten steel quality.

[0004] The present invention provides an inclusion cleaning device for a tundish, comprising: Impacted parts, flow guide parts, and air blowing parts; The impacted component is a cylindrical structure with one end open formed by a bottom surface and a side surface, which is arranged at the bottom of the tundish and located below the long nozzle, and directly bears the impact of the molten steel from the long nozzle; The flow guide component is a cylindrical structure formed by a top surface and a side surface. A hole matching the horizontal cross section of the impacted component is provided on the top surface. The flow guide component is buckled above the impacted component, and the edge of the hole provided on the top surface is connected to the top of the side surface of the impacted component. The side surface of the flow guide component is provided at the bottom of the tundish to form the outer limit of the inclusion cleaning device. The side surface of the flow guide component is provided with a steel flow hole perpendicular to the side surface of the flow guide component or inclined above the horizontal direction. An opening is provided around the hole provided on the top surface of the flow guide component. The molten steel overflowing from the impacted component flows from the opening provided on the top surface of the flow guide component into the area between the side surface of the impacted component and the side surface of the flow guide component, and then flows out from the steel flow hole, so that the flow of molten steel and the treatment of inclusions can be optimized. The blowing component is arranged at the bottom area of ​​the tundish between the side of the impacted component and the side of the guide component. An air outlet is provided on the surface of the blowing component for blowing air into the molten steel in the tundish; the cleaning effect of the molten steel can be effectively enhanced.

[0005] As a preferred solution of the inclusion cleaning device for a tundish described in the present invention, the top surface of the guide component is inclined below the horizontal direction relative to the side surface to which it is connected, and the inclination angle is not less than 5°.

[0006] 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 tundish; the molten steel overflows from the impacted component and enters the blowing area, and is churned by the bottom blowing gas; the bottom blowing gas in the blowing area can continuously churn the molten steel to form an effective gas flow; this gas flow can not only help the inclusions carried by the molten steel to rise to the slag layer, but also promote uniform mixing inside the molten steel, thereby improving the overall cleanliness of the molten steel and the treatment effect.

[0007] As a preferred solution of the inclusion cleaning device for the tundish described in the present invention, the distribution form of the gas channel of the blowing component includes uniform distribution, concentrated distribution, gradient distribution or staggered distribution. The structural design of the gas channel allows the gas to enter the tundish evenly through the blowing component; the structural design can ensure the uniform distribution of the gas inside the blowing component, 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.

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

[0009] As a preferred embodiment of the inclusion cleaning device for a tundish of the present invention, the blowing part is a permeable brick, and the total amount of air blown by the blowing part is related to the amount of molten steel. The total amount of air blown by the blowing part per hour is 0.5 to 5 times the volume of molten steel poured per hour. The gas blown into the blowing part is argon.

[0010] As a preferred embodiment of the inclusion cleaning device for a tundish described in the present invention, the size of the flow guide component is adjusted according to the size of different tundishes. The bottom area of ​​the space enclosed by the side of the flow guide component, that is, the bottom area of ​​the inclusion cleaning device, is not higher than 50% of the bottom area of ​​the entire tundish, and is not lower than 10% of the bottom area of ​​the entire tundish; the length of the outer major axis of the flow guide component, that is, the length of the major axis of the inclusion cleaning device, does not exceed 60% of the length between the two ends of the inner wall of the tundish in the direction of the major axis, to ensure that the size of the inclusion cleaning device is not too large, to avoid the problem of reduced 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 effects, and ensure effective cleaning of the tundish. The thickness of the side of the flow guide component can be adjusted as needed, which is 5~40% of the length of the outer major axis of the flow guide component.

[0011] The beneficial effects of the present invention are as follows: The present invention provides an inclusion cleaning device for a tundish, comprising an impacted component, a flow guide component, and an air blowing component; the impacted component is a cylindrical structure formed by a bottom surface and a side surface with an open end, arranged at the bottom of the tundish and located below the long water nozzle, and directly bears the impact of the molten steel from the long water nozzle; the flow guide component is a cylindrical structure formed by a top surface and a side surface, the top surface is provided with a hole matching the horizontal cross section of the impacted component, the flow guide component is buckled above the impacted component, and the edge of the hole opened on the top surface is connected to the top of the side surface of the impacted component; the side surface of the flow guide component is arranged at the bottom of the tundish, forming the outer surface of the inclusion cleaning device Boundary; The side of the flow guide component is provided with a steel flow hole perpendicular to the side of the flow guide component or inclined above the horizontal direction, and the hole provided on the top surface of the flow guide component is provided with an opening around it, and the molten steel overflowing from the impacted component flows from the opening provided on the top surface of the flow guide component into the area between the side of the impacted component and the side of the flow guide component, and then flows out from the steel flow hole, which can optimize the flow mode of the molten steel and the removal effect of inclusions; The blowing component is provided in the bottom area of ​​the tundish between the side of the impacted component and the side of the flow guide component, and the surface of the blowing component is provided with an air outlet for blowing air into the molten steel in the tundish; It can effectively enhance the cleanliness effect of the molten steel. The present invention not only improves the cleanliness of the molten steel, but also ensures the stability and consistency of the quality of the molten steel, and is more suitable for use in a single-flow or double-flow tundish, providing an efficient solution for the steel production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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.

[0013] Figure 1 It is a schematic structural diagram of the inclusion cleaning device of the present invention; Figure 2 is a schematic diagram of the bottom of the inclusion cleaning device of the present invention; Figure 3 is a 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.

[0014] Description of Figure Numbers: 1-impacted part, 2a-flow guide part, 2b-steel flow hole, 2c-air blowing part, 3-tundish, 4-steel outlet.

[0015] 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

[0016] 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.

[0017] The main purpose of the present invention is to provide an inclusion cleaning device for a tundish, which has the following advantages: (1) Design of impacted parts: The impacted parts are located at the lower side of the long shroud and directly bear 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 guide components: The structural design of the flow guide components adjusts the flow path of the molten steel in the tundish, and the size of the flow guide 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 production adaptability.

[0019] (3) Design of blowing components: External gas is evenly blown in through the blowing components to form a continuous tumbling flow, which drives inclusions to rise to the slag layer, thereby significantly improving the cleanliness of the molten steel.

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

[0021] (5) Through the cooperation of the flow guide component and the blowing component, a double-layer 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 the quality of the molten steel, and helps to improve the efficiency of inclusion treatment and overall cleanliness.

[0022] like Figure 1-4 As shown, an embodiment of the present invention provides an inclusion cleaning device for a tundish, comprising: Impacted component 1, flow guide component 2a, air blowing component 2c; The impacted component 1 is a cylindrical structure formed by a bottom surface and a side surface with an open end, which is arranged at the bottom of the tundish 3 and located below the long nozzle, and directly bears the impact of the molten steel from the long nozzle; The flow guide component 2a is a cylindrical structure formed by a top surface and a side surface. A hole matching the horizontal cross section of the impacted component 1 is provided on the top surface. The flow guide component 2a is buckled above the impacted component 1, and the edge of the hole provided on the top surface is connected to the top of the side surface of the impacted component 1; the side surface of the flow guide component 2a is provided at the bottom of the tundish 3 to form the outer limit of the inclusion cleaning device; a steel flow hole 2b perpendicular to the side surface of the flow guide component 2a or inclined above the horizontal direction is provided on the side surface of the flow guide component 2a, and openings are provided around the hole provided on the top surface of the flow guide component 2a. The molten steel overflowing from the impacted component 1 flows from the opening provided on the top surface of the flow guide component 2a into the area between the side surface of the impacted component 1 and the side surface of the flow guide component 2a, and then flows out from the steel flow hole 2b, so that the flow of molten steel and the treatment of inclusions can be optimized; The blowing component 2c is arranged in the bottom area of ​​the tundish 3 between the side of the impacted component 1 and the side of the guide component 2a. An air outlet is opened on the surface of the blowing component 2c 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 cross-section of the impacted component 1 is circular or elliptical when viewed from above; the cross-section of the flow guide component 2a is circular or elliptical when viewed from above.

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

[0025] In one embodiment of the present invention, a gas channel is provided in the blowing component 2c, which is connected to the gas supply device and is used to blow external gas into the molten steel in the middle bag 3; the molten steel overflows from the impact component 1 and enters the blowing area, and is churned by the bottom blowing gas; the bottom blowing gas in the blowing area can continuously churn the molten steel to form an effective gas flow; this gas flow can not only help the inclusions carried by the molten steel to 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 distribution form of the gas channel of the blowing part 2c includes uniform distribution, concentrated distribution, gradient distribution or staggered distribution. The structural design of the gas channel allows the gas to enter the tundish 3 evenly through the blowing part 2c; the structural design can ensure the uniform distribution of the gas inside the blowing part 2c, 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.

[0027] In one embodiment of the present invention, the blowing component 2c adopts vertical blowing or oblique blowing; vertical blowing refers to the gas being directly blown into the molten steel along the vertical axis of the blowing component upward, so as to achieve uniform gas distribution; oblique blowing refers to the gas being blown in at an oblique upward angle, and the angle between the oblique upward direction and the bottom surface of the ladle 3 is not less than 10°. This method can more effectively adjust the direction and speed of the gas flow to optimize the mixing and cleaning effects of the molten steel; the selection of 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 blowing component 2c is a permeable brick, the total blowing flow of the blowing component 2c is related to the amount of molten steel, and 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 gas blown into the blowing component 2c is argon. The pore distribution form and flow control of the blowing component 2c can accurately adjust the distribution of the gas, 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 guide component 2a is adjusted according to the size of different tundishes 3. The bottom area of ​​the space enclosed by the side of the flow guide component 2a, that is, 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 tundish 3, and is not less than 10% of the bottom area of ​​the entire tundish; the outer long axis length of the flow guide component 2a, that is, the length of the inclusion cleaning device does not exceed 60% of the length between the two ends of the inner wall of the tundish 3 in the long axis direction, to ensure that the size of the inclusion cleaning device is not too large, to avoid the problem of reduced 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 effects, and ensure effective cleaning of the tundish. The thickness of the side of the flow guide component can be adjusted as needed, which is 5-40% of the outer long axis length of the flow guide component 2a.

[0030] When the inclusion cleaning device for the tundish of the present invention is in use, the molten steel flows into the impacted component 1 from the long water inlet, and the molten steel overflowing from the impacted component 1 flows into the area between the side of the impacted component 1 and the side of the guide component 2a from the opening set on the top surface of the guide component 2a, and then flows out from the steel flow hole 2b. The gas in the blowing component 2c is evenly distributed through the designed air flow channel to form bubbles and churn the molten steel. During the rising process, the bubbles continuously aggregate and absorb inclusions. A part of the bubbles rises to the slag surface through the opening on the top surface of the guide component 2a, and the other part of the bubbles flows out from the steel flow hole 2b on the side of the guide component 2a to form a double-layer blowing layer. This process not only improves the buoyancy of the inclusions, but also promotes the mixing of the molten steel, thereby improving the overall cleanliness of the molten steel. As the gas continues to churn, the inclusions are effectively brought to the slag layer, reducing their content in the molten steel, and then the molten steel flows out from the steel 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 flow guide component to the length of the two ends of the long axis direction of the inner wall of the tundish is 3:8, and the top surface of the flow guide component is inclined below the horizontal direction relative to the side surface to which it is connected, and the inclination angle is 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 the tundish that does not use the inclusion cleaning device of this embodiment, the inclusion removal rate is only 31.19%.

[0032] 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: Impacted parts, flow guide parts, and air blowing parts; The impacted component is a cylindrical structure formed by a bottom surface and a side surface with an open end, which is arranged at the bottom of the tundish and located below the long nozzle, and directly bears the impact of the molten steel from the long nozzle; The flow guide component is a cylindrical structure formed by a top surface and a side surface. The top surface is provided with a hole matching the horizontal cross section of the impacted component. The flow guide component is buckled above the impacted component, and the edge of the hole provided on the top surface is connected to the top of the side surface of the impacted component. The side surface of the flow guide component is provided at the bottom of the tundish to form the outer limit of the inclusion cleaning device. The side surface of the flow guide component is provided with a steel flow hole perpendicular to the side surface of the flow guide component or inclined above the horizontal direction. The hole provided on the top surface of the flow guide component is provided with openings around it. The molten steel overflowing from the impacted component flows from the opening provided on the top surface of the flow guide component into the area between the side surface of the impacted component and the side surface of the flow guide component, and then flows out from the steel flow hole. The blowing component is arranged at the bottom area of ​​the tundish between the side of the impacted component and the side of the flow guide component, and a gas outlet is opened on the surface of the blowing component for blowing gas into the molten steel in the tundish.

2. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The top surface of the guide component is inclined below the horizontal direction relative to the side surface to which it is connected, and the inclination angle is not less than 5°.

3. The inclusion cleaning device for a tundish according to claim 1, characterized in that: A gas channel is provided in the blowing component and is connected to the gas supply device for blowing external gas into the molten steel in the tundish.

4. The inclusion cleaning device for a tundish according to claim 3, characterized in that: The distribution forms of the gas channels of the blowing component include uniform distribution, concentrated distribution, gradient distribution or staggered distribution.

5. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The blowing parts adopt vertical blowing or oblique blowing mode.

6. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The blowing parts are air-permeable bricks.

7. 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 molten steel poured per hour.

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

9. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The bottom area of ​​the space enclosed by the sides of the guide component shall not be higher than 50% and not lower than 10% of the bottom area of ​​the entire tundish; the length of the external major axis of the guide component shall not exceed 60% of the length between the two ends of the major axis direction of the inner wall of the tundish.

10. The inclusion cleaning device for a tundish according to claim 1, characterized in that: The thickness of the side surface of the guide component is 5-40% of the length of the outer major axis of the guide component.

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