Continuous casting tundish

Abstract

The utility model discloses a continuous casting tundish, and belongs to the technical field of steelmaking continuous casting. The continuous casting tundish comprises a shell, a retaining wall, a retaining dam and a protrusion. The retaining wall is installed in the shell and divides the interior of the shell into an impact area and a casting flow area, and a middle opening is formed in the bottom end of the retaining wall so as to communicate the impact area with the casting flow area; the retaining dam is installed in the shell and located in the casting flow area, and the top end of the retaining dam is lower than the top end of the retaining wall; at least one protrusion is arranged on the side, close to each other, of the retaining wall or the retaining dam in a protruding mode and extends in the height direction of the retaining wall or the height direction of the retaining dam. According to the continuous casting tundish, the flowing speed and the flowing direction of molten steel are changed through the effect of the protruding structures, so that the flowing form of the molten steel in the whole continuous casting tundish is improved, the flowing uniformity of the molten steel in the whole shell is guaranteed, the effectiveness of separation of inclusions in the molten steel is improved, and therefore the cleanliness of the molten steel can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a continuous casting tundish in the technical field of steelmaking continuous casting, and particularly relates to a continuous casting tundish. BACKGROUND

[0002] In the process of steelmaking continuous casting, the continuous casting tundish plays a key role in the process, that is, the continuous casting tundish is an important transition container between the refining ladle and the continuous casting crystallizer; the mutual cooperation of the retaining wall and the retaining dam is usually arranged in the shell of the continuous casting tundish to realize the uniformity of the flow field of the molten steel in the shell and the floating of the inclusions.

[0003] Specifically, the retaining wall separates the shell into an impact zone and a casting flow zone, the retaining dam is located in the casting flow zone, and a middle opening is arranged at the bottom end of the retaining wall; the molten steel in the refining ladle flows into the casting flow zone between the retaining wall and the retaining dam through the middle opening at the bottom end; then, when the continuous casting tundish starts to work and is about to stop working, the molten steel flows to the casting flow zone on the right side of the retaining dam through the two side openings at the bottom end of the retaining dam; when the molten steel gradually fills the shell, the molten steel flows over to the casting flow zone on the right side of the retaining dam through the top end of the retaining dam; finally, the molten steel flows into the continuous casting crystallizer through the tapping hole in the casting flow zone.

[0004] However, when the molten steel flows between the retaining wall and the retaining dam, a horizontal rotating flow is formed in the region between the retaining wall and the retaining dam, thereby causing uneven flow of the molten steel in the whole shell, which affects the floating of the inclusions in the molten steel to the upper surface of the molten steel, and the cleanliness of the molten steel cannot be guaranteed.

[0005] In view of the above problems, a continuous casting tundish is needed to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a continuous casting tundish, which can improve the flow form of the molten steel in the continuous casting tundish, guarantee the uniformity of the flow of the molten steel, and be beneficial to the floating of the inclusions in the molten steel to the upper surface of the molten steel, so as to improve the cleanliness of the molten steel.

[0007] To achieve the purpose, the utility model adopts the following technical scheme:

[0008] The continuous casting tundish comprises:

[0009] a shell;

[0010] a retaining wall installed in the shell and separating the shell into an impact zone and a casting flow zone, wherein a middle opening is arranged at the bottom end of the retaining wall to connect the impact zone and the casting flow zone;

[0011] a retaining dam installed in the shell and located in the casting flow zone, wherein the top end of the retaining dam is lower than the top end of the retaining wall;

[0012] The retaining wall or the dam has at least one protrusion on one side that is close to each other. The protrusion extends along the height direction of the retaining wall or the height direction of the dam. The height direction of the retaining wall and the height direction of the dam are both parallel to the Z-axis.

[0013] As an optional feature, the dam has two protrusions on the side near the retaining wall, and the two protrusions are arranged symmetrically.

[0014] Alternatively, the two protrusions are positioned opposite each other on either side of the central opening.

[0015] As an optional feature, the angle between the axis of the protrusion and the Z-axis is -15° to 15°.

[0016] Alternatively, the distance between the two protrusions gradually increases or decreases along the Z-axis from bottom to top.

[0017] As an alternative, the height of the protrusion along the Z-axis is not higher than the height of the retaining dam.

[0018] As an optional feature, in the horizontal distance direction between the dam and the retaining wall, the outward protrusion length of the protrusion is located at 10% to 60% of the horizontal distance between the dam and the retaining wall.

[0019] As an optional solution, the bottom end of the dam is provided with two side openings at an angle, and the distance between the two side openings gradually increases or decreases along the Z-axis from bottom to top.

[0020] As an optional solution, the continuous casting tundish also includes:

[0021] A long nozzle is connected to the shell and is located in the impact zone. Molten steel enters the impact zone from the long nozzle.

[0022] As an optional solution, the continuous casting tundish also includes:

[0023] A stopper rod is provided at the outlet of the casting flow zone and is used to adjust the flow rate of the liquid at the outlet.

[0024] The beneficial effects of this utility model are as follows:

[0025] The continuous casting tundish of this invention features a baffle wall installed inside a shell, dividing the shell into an impact zone and a casting flow zone. A central opening at the bottom of the baffle wall connects the impact zone and the casting flow zone. A dam is installed inside the shell within the casting flow zone, with its top lower than the top of the baffle wall. Simultaneously, at least one protrusion is provided on the side of the baffle wall or dam that is close to each other, extending along the height of either the baffle wall or the dam. When molten steel flows into the casting flow zone between the baffle wall and the dam through the central opening, the protrusion changes the flow rate and direction of the molten steel, preventing horizontal rotational flow between the baffle wall and the dam. This improves the flow pattern of the molten steel within the entire continuous casting tundish, ensuring uniformity of molten steel flow throughout the shell. This reduces the possibility of slag entrapment in the tundish, improves the effectiveness of separating inclusions in the molten steel, and facilitates the upward floating of inclusions to the upper surface of the molten steel, thereby enhancing the cleanliness of the molten steel. Attached Figure Description

[0026] Figure 1 This is a top view of the continuous casting tundish provided by this utility model;

[0027] Figure 2 This is a top view of the retaining dam and protrusion provided by this utility model;

[0028] Figure 3 This is a front view of the retaining wall and protrusion provided by this utility model;

[0029] Figure 4 This is a front view of the retaining wall provided by this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Shell; 11-Impact zone; 12-Casting flow zone;

[0032] 2-Retaining wall; 21-Central opening; 3-Dam; 31-Side opening; 4-Protrusion; 5-Long water inlet; 6-Stop bar. Detailed Implementation

[0033] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0034] Any feature disclosed in this specification, unless specifically stated otherwise, may be replaced by other equivalent or similar features. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features. Throughout this specification, the same reference numerals indicate the same elements.

[0035] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] This embodiment proposes a continuous casting tundish that enables better uniformity of molten steel flow, avoids horizontal rotational flow of molten steel during the flow process, thus ensuring good flow performance of molten steel, improving the effectiveness of separating inclusions in molten steel, and thereby improving the cleanliness of molten steel.

[0037] Specifically, such as Figures 1 to 4 As shown, the continuous casting tundish includes a shell 1, a retaining wall 2, a retaining dam 3, and a protrusion 4. The retaining wall 2 is installed inside the shell 1, dividing the shell 1 into an impact zone 11 on the left and a casting flow zone 12 on the right. A central opening 21 at the bottom of the retaining wall 2 connects the impact zone 11 and the casting flow zone 12. The retaining dam 3 is installed inside the shell 1 and located in the casting flow zone 12. The top of the retaining dam 3 is lower than the top of the retaining wall 2, so that the retaining wall 2 and the retaining dam 3 form a weir and dam structure, which, under the combined action of the retaining wall 2 and the retaining dam 3, promotes the separation and upward floating of inclusions. At least one protrusion 4 is provided on the side of the retaining wall 2 or the retaining dam 3 that is close to each other, extending along the height direction of the retaining wall 2 or the retaining dam 3. The height directions of both the retaining wall 2 and the retaining dam 3 are parallel to the Z-axis.

[0038] Compared with the prior art, the continuous casting tundish in this embodiment has at least one protrusion 4 added to the side of the retaining wall 2 or the retaining dam 3 that is close to each other, and the protrusion 4 extends along the height direction of the retaining wall 2 or the retaining dam 3. When molten steel flows into the casting flow zone 12 between the retaining wall 2 and the retaining dam 3 through the central opening 21, the flow rate and flow direction of the molten steel can be changed under the action of the protrusion 4 structure. This can prevent the molten steel in the area between the retaining wall 2 and the retaining dam 3 from forming a horizontal rotational flow, thereby improving the flow pattern of molten steel in the entire continuous casting tundish. This can ensure the uniformity of molten steel flow in the entire shell 1, reduce the possibility of slag entrapment in the continuous casting tundish, improve the effectiveness of separating inclusions in the molten steel, and facilitate the inclusions in the molten steel to float to the upper surface of the molten steel, thereby improving the cleanliness of the molten steel.

[0039] Preferably, in this embodiment, as Figures 1 to 3 As shown, two protrusions 4 are provided on the side of the retaining dam 3 near the retaining wall 2, and the two protrusions 4 are arranged symmetrically. In other embodiments, protrusions 4 can also be provided on the side of the retaining wall 2 near the retaining dam 3. The specific number of protrusions 4 is not limited and needs to be determined according to the actual structural configuration of the retaining dam 3 and the retaining wall 2 and the working conditions of molten steel flow.

[0040] By symmetrically protruding two protrusions 4 on the side of the retaining wall 2 near the retaining dam 3, on the one hand, the structural function of the two protrusions 4 can better change the flow rate and flow direction of the molten steel, and further improve the flow pattern of the molten steel in the entire continuous casting tundish; on the other hand, the symmetrical arrangement of the two protrusions 4 can more uniformly change the flow rate and flow direction of the molten steel, and further ensure the uniformity of the flow of molten steel in the entire shell 1.

[0041] Specifically, such as Figures 1 to 3 As shown, the protrusion 4 and the retaining dam 3 are an integral structure, which eliminates the assembly process between the protrusion 4 and the retaining dam 3 and ensures the stability of the connection between the retaining dam 3 and the protrusion 4. In other embodiments, the retaining dam 3 and the protrusion 4 can also be separate structures, which is not specifically limited here.

[0042] Furthermore, the two protrusions 4 are located opposite each other on both sides of the central opening 21, that is, the two protrusions 4 are staggered from the central opening 21, so as to avoid the two protrusions 4 blocking the central opening 21, thereby ensuring the smooth flow of molten steel in the central opening 21.

[0043] Specifically, the angle between the axis of the protrusion 4 and the Z-axis is -15° to 15°. That is, relative to the dam 3, the protrusion 4 can be set vertically along the Z-axis or inclined at a certain angle with the Z-axis. This ensures that the area of ​​the molten steel impacting the protrusion 4 is appropriate, thereby better changing the flow path of the molten steel flowing into the casting flow zone 12 from the two side openings 31 at the bottom of the dam 3, and further improving the flow pattern of the molten steel in the entire continuous casting tundish.

[0044] Specifically, such as Figure 3 As shown, along the Z-axis and from bottom to top, the distance between the two protrusions 4 gradually increases or decreases. That is, both protrusions 4 are inclined at a certain angle to the Z-axis, and the two protrusions 4 can form a flared or constricted shape, which can significantly affect the flow velocity and flow direction of the molten steel flowing through the two protrusions 4, and further ensure the uniformity of the flow of molten steel in the entire continuous casting tundish.

[0045] Furthermore, along the Z-axis, the height of the protrusion 4 should not be higher than the height of the retaining dam 3. That is, along the Z-axis, the height of the protrusion 4 should be consistent with or less than the height of the retaining dam 3, so as to avoid the improvement of the flow field performance of molten steel due to the height of the protrusion 4 being higher than the height of the retaining dam 3.

[0046] Specifically, such as Figure 1As shown, in the horizontal distance direction between the retaining dam 3 and the retaining wall 2, the outward protrusion length of the protrusion 4 is located between 10% and 60% of the horizontal distance between the retaining dam 3 and the retaining wall 2. The horizontal distance direction between the retaining dam 3 and the retaining wall 2 is parallel to the X-axis.

[0047] By positioning the protrusion 4 along the X-axis to be 10% to 60% of the horizontal distance between the retaining wall 2 and the dam 3, the following measures can be taken: Firstly, the protrusion 4 should not be too long and come into contact with the retaining wall 2, thus blocking the flow of molten steel and ensuring the free flow of molten steel in the area between the retaining wall 2 and the dam 3. Secondly, the protrusion 4 should not be too short, which would prevent a significant improvement in the flow rate and direction of the molten steel.

[0048] Furthermore, such as Figure 3 As shown, two side openings 31 are inclinedly provided on opposite sides of the bottom end of the retaining dam 3. Along the Z-axis and from bottom to top, the distance between the two side openings 31 gradually increases or decreases. That is, the side openings 31 can form a triangular structure between the inner wall surface of the shell 1 and the outer edge of the bottom end of the retaining dam 3, which can facilitate the guiding flow of molten steel in the side openings 31.

[0049] Specifically, when the continuous casting tundish is just starting to work and is about to finish working, the molten steel flows through the two side openings 31 to the casting flow zone 12 located on the right side of the dam 3; as the molten steel gradually fills the shell 1, the molten steel overflows through the top of the dam 3 to the casting flow zone 12 located on the right side of the dam 3.

[0050] Specifically, such as Figure 1 As shown, the continuous casting tundish also includes a long nozzle 5, which is connected to the shell 1 and located in the impact zone 11. That is, one end of the long nozzle 5 is connected to the refining ladle, and the other end is connected to the impact zone 11. Molten steel in the refining ladle enters the impact zone 11 through the long nozzle 5. The long nozzle 5 can adopt the existing long nozzle 5 structure in continuous casting tundishes.

[0051] Specifically, a turbulence generator is installed at the bottom of the long nozzle 5. This generator forces the molten steel exiting the long nozzle 5 to flow upwards along the Z-axis. It is understandable that without the turbulence generator, the molten steel would initially surge upwards along the Z-axis; however, the turbulence generator makes the flow of the molten steel exiting the long nozzle 5 more regular and the flow direction more clearly defined. The structure of the turbulence generator is a common existing structure and will not be described in detail here.

[0052] Furthermore, such as Figure 1As shown, the continuous casting tundish also includes a stopper rod 6, which is located at the tap hole of the casting flow zone 12. The casting flow zone 12 has multiple tap holes, and a stopper rod 6 is provided at each tap hole. This allows for adjustment of the molten steel flow rate at the tap hole, thereby controlling the molten steel discharge rate. The stopper rod 6 can utilize the existing stopper rod structure found in continuous casting tundishes; and the mating structure between the stopper rod 6 and the tap hole is a common mating structure in this field, which will not be described in detail here.

[0053] The specific working process of the continuous casting tundish in this embodiment is as follows:

[0054] First, the molten steel in the refining ladle enters the impact zone 11 inside the shell 1 through the long nozzle 5. The molten steel entering the impact zone 11 flows into the area between the retaining wall 2 and the dam 3 through the central opening 21 at the bottom of the retaining wall 2. In this area, the molten steel impacts two protrusions 4, which can change the flow rate and direction of the molten steel under the action of the two protrusions 4 structure, so as to avoid the molten steel in the area between the retaining wall 2 and the dam 3 forming a horizontal rotational flow, thereby improving the flow pattern of the molten steel in the entire continuous casting tundish.

[0055] Then, when the continuous casting tundish just starts working, the molten steel flowing into the area between the retaining wall 2 and the retaining dam 3 flows through the two side openings 31 at the bottom of the retaining dam 3 to the casting flow zone 12 located on the right side of the retaining dam 3; as the molten steel gradually fills the entire shell 1, the molten steel overflows through the top of the retaining dam 3 to the casting flow zone 12 located on the right side of the retaining dam 3; then the molten steel in the casting flow zone 12 flows into the outlet through the gap between the stopper 6 and the outlet, and then flows into the continuous casting crystallizer through the outlet; thus, the intermediate flow of molten steel between the refining ladle and the continuous casting crystallizer is achieved through the continuous casting tundish, and the purpose of improving the cleanliness of the molten steel is to improve the molten steel. Among them, the refining ladle and the continuous casting crystallizer are common structures in existing steelmaking continuous casting technology, and the specific structure and working principle of the refining ladle and the continuous casting crystallizer will not be described in detail here.

[0056] In this embodiment, the continuous casting tundish has two protrusions 4 arranged on the side of the retaining wall 2 near the retaining dam 3, with the angle between the axis of the protrusion 4 and the Z-axis being -15° to 15°. The protruding length of the protrusion 4 is 10% to 60% of the horizontal distance between the retaining dam 3 and the retaining wall 2. This allows the protrusions 4 to improve the flow pattern of molten steel in the area between the retaining wall 2 and the retaining dam 3, thereby improving the flow field performance of the molten steel in the entire continuous casting tundish. This eliminates the horizontal rotational flow of molten steel in the area between the retaining wall 2 and the retaining dam 3, reducing the possibility of slag entrapment in the continuous casting tundish, improving the effectiveness of inclusion separation in the molten steel, and increasing the cleanliness of the molten steel, ensuring that high-cleanliness molten steel enters the continuous casting mold.

[0057] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A continuous casting tundish, characterized in that, include: Shell (1); A baffle (2) is installed inside the housing (1) and divides the housing (1) into an impact zone (11) and a casting flow zone (12). The bottom end of the baffle (2) is provided with a central opening (21) to connect the impact zone (11) and the casting flow zone (12). A dam (3) is installed inside the shell (1) and located in the casting flow zone (12), with the top of the dam (3) being lower than the top of the retaining wall (2); A protrusion (4) is provided on one side of the retaining wall (2) or the retaining dam (3) that are close to each other. The protrusion (4) extends along the height direction of the retaining wall (2) or the height direction of the retaining dam (3). The height direction of the retaining wall (2) and the height direction of the retaining dam (3) are both parallel to the Z-axis.

2. The continuous casting tundish as described in claim 1, characterized in that, The dam (3) has two protrusions (4) on the side near the retaining wall (2), and the two protrusions (4) are symmetrically arranged.

3. The continuous casting tundish as described in claim 2, characterized in that, The two protrusions (4) are located opposite each other on both sides of the central opening (21).

4. The continuous casting tundish as described in claim 2, characterized in that, The angle between the axis of the protrusion (4) and the Z-axis is -15° to 15°.

5. The continuous casting tundish as described in claim 4, characterized in that, Along the Z-axis and from bottom to top, the distance between the two protrusions (4) gradually increases or decreases.

6. The continuous casting tundish as described in claim 2, characterized in that, Along the Z-axis, the height of the protrusion (4) is not higher than the height of the dam (3).

7. The continuous casting tundish as described in claim 2, characterized in that, In the horizontal distance direction between the dam (3) and the retaining wall (2), the outward protrusion length of the protrusion (4) is located at 10% to 60% of the horizontal distance between the dam (3) and the retaining wall (2).

8. The continuous casting tundish as described in any one of claims 1-7, characterized in that, The bottom end of the dam (3) is provided with two side openings (31) at an incline. Along the Z-axis and from bottom to top, the distance between the two side openings (31) gradually increases or decreases.

9. The continuous casting tundish as described in any one of claims 1-7, characterized in that, The continuous casting tundish also includes: A long nozzle (5) is connected to the shell (1). The long nozzle (5) is located in the impact zone (11). Molten steel enters the impact zone (11) from the long nozzle (5).

10. The continuous casting tundish as described in any one of claims 1-7, characterized in that, The continuous casting tundish also includes: A stopper rod (6) is provided at the outlet of the casting flow zone (12) and is used to adjust the flow rate of the liquid at the outlet.

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