A tundish current stabilizer and a tundish

Abstract

This utility model relates to the technical field of tundish flow stabilizers, and discloses a tundish flow stabilizer comprising: a flow stabilizer body having a cavity penetrating the flow stabilizer body for molten steel flow; a guide channel disposed within the cavity for guiding the molten steel flow; the guide channel extending spirally and arranged near the inlet of the cavity; a guide fluid disposed within the cavity and having multiple guide holes for molten steel passage; the guide fluid being arranged near the outlet of the cavity. This utility model can simultaneously satisfy the requirements of good kinetic energy attenuation of molten steel and relatively uniform molten steel flow field distribution.

Description

Technical Field

[0001] This utility model relates to the field of continuous casting tundish technology, and in particular to a tundish flow stabilizer and a tundish. Background Technology

[0002] The tundish is a refractory container used in short-process steelmaking. It first receives molten steel poured from the ladle, and then distributes it to various crystallizers through the tundish nozzle. As an important basic raw material, steel plays a crucial role in the economic development of countries around the world.

[0003] The tundish flow stabilizer is a key device in the continuous casting process. The main body of the flow stabilizer is installed inside the tundish, specifically within the impact zone of the molten steel. The flow stabilizer body has an internal cavity, and an outlet is located at its bottom. The flow stabilizer first receives the molten steel and then discharges it into the tundish.

[0004] The core functions of the tundish flow stabilizer are: to change the direction and speed of molten steel flow, reduce eddies and slag entrainment, and suppress splashing; to reduce the direct impact of molten steel on the bottom of the tundish, avoiding damage to refractory materials and tundish penetration accidents; to extend the residence time of molten steel and promote the floating of inclusions, thereby improving the surface and internal quality of the billet.

[0005] In related technologies, conventional intermediate drum current stabilizers typically have the following problems during use:

[0006] 1. Insufficient kinetic energy attenuation of molten steel: Conventional tundish flow stabilizers have low absorption efficiency for the impact kinetic energy of molten steel, resulting in significant splashing during pouring.

[0007] 2. Uneven distribution of molten steel flow field: Local eddies are easily formed in conventional tundish flow stabilizers, which can easily lead to secondary entrainment of inclusions.

[0008] Therefore, there is an urgent need for a new type of intermediate drum flow stabilizer that can simultaneously achieve efficient kinetic energy attenuation and uniform flow field distribution. Utility Model Content

[0009] This application discloses an intermediate tumbler stabilizer and an intermediate tumbler to solve the problems of insufficient kinetic energy attenuation and uneven flow field distribution in related technologies.

[0010] To solve the above problems, the present invention adopts the following technical solution:

[0011] In a first aspect, this application discloses an intermediate package current stabilizer, comprising:

[0012] The main body of the flow stabilizer has a cavity that runs through it to allow molten steel to flow.

[0013] A flow guide channel, installed inside the cavity, is used to guide the flow of molten steel; the flow guide channel extends in a spiral shape and is arranged close to the inlet of the cavity;

[0014] The guide fluid is located inside the cavity and has multiple guide holes for molten steel to pass through; the guide fluid is arranged near the outlet of the cavity.

[0015] Furthermore, the cavity has a liquid outlet, which is located near the bottom of the guide fluid;

[0016] The liquid outlet extends radially through the main body of the flow stabilizer.

[0017] Furthermore, the cavity also has a liquid inlet, which is located near the top of the guide channel;

[0018] The diameter of the liquid inlet gradually decreases from the top to the bottom of the main body of the flow stabilizer.

[0019] Furthermore, the projection of the liquid inlet section along the radial direction of the flow stabilizer body is conical.

[0020] Furthermore, the top of the guide fluid is provided with a spherical concave surface to buffer the molten steel falling from the guide groove onto the top of the guide fluid.

[0021] Furthermore, the projection of the guide hole along the flow axis is a regular hexagon.

[0022] Furthermore, the multiple guide holes are arranged in a honeycomb pattern.

[0023] Furthermore, the taper of the radial conical projection of the main body of the current stabilizer is 45°~60°.

[0024] Furthermore, the radius of curvature of the spherical concave surface is greater than or equal to 300 mm, and the concave height of the spherical concave surface is 20~30 mm.

[0025] Secondly, this application also discloses an intermediate package, including the intermediate package current stabilizer described in the first aspect.

[0026] The technical solution adopted in this utility model can achieve the following beneficial effects:

[0027] 1. In this utility model, the guide fluid and the guide channel are first installed sequentially inside the mounting cavity of the stabilizer body. Then, the stabilizer body is installed inside the tundish in the area impacted by molten steel, so that the outlet of the stabilizer body is located above the bottom wall of the tundish. Then, molten steel can be poured into the inlet of the stabilizer body. During the pouring process, the molten steel enters the stabilizer body from the inlet and flows along the spiral guide channel to form a swirling flow, and the kinetic energy is gradually absorbed. Through the synergistic effect of the spiral guide channel and the guide fluid, the kinetic energy attenuation efficiency of the molten steel is greatly improved, and the initial splash volume is significantly lower than that of the traditional stabilizer structure. After being buffered by the guide channel and the guide fluid, the molten steel flows into the tundish through the outlet. In addition, the multiple guide holes on the guide fluid disperse the molten steel into several smaller streams, which can eliminate large-scale eddies, make the molten steel flow field distribution more uniform, and increase the residence time of the molten steel, thereby improving the flotation rate of inclusions in the molten steel.

[0028] 2. In this utility model, the main body of the flow stabilizer, the flow guide groove structure and the flow guide structure in the intermediate tundish flow stabilizer can all be produced separately. The modular design can reduce the manufacturing difficulty and make it easier to adapt to the actual working conditions of different intermediate tundishes. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the assembly structure of the current stabilizer and intermediate package disclosed in some embodiments of this application;

[0031] Figure 2 This is a structural diagram of a current stabilizer disclosed in some embodiments of this application;

[0032] Figure 3 These are some embodiments disclosed in this application. Figure 2 Top view.

[0033] In the picture:

[0034] 1. Main body of the flow stabilizer; 2. Liquid inlet; 3. Mounting cavity; 4. Liquid outlet; 5. Flow guide groove; 6. Flow guide fluid; 7. Flow guide hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0037] Traditional straight-cylinder or stepped-cavity tundishes have low absorption efficiency for the impact kinetic energy of molten steel, resulting in significant splashing during pouring. If the splashed molten steel comes into contact with damp ground or equipment, it can cause a secondary explosion, potentially damaging the equipment. The temperature of the splashed molten steel exceeds 1500℃, which can directly cause severe burns, even fatal ones. In real-world cases, there have been instances of death caused by a single drop of molten steel, and in some companies, splashing has resulted in multiple people suffering burns covering over 90% of their bodies. Splashing leads to a loss of 0.5%-5% of molten steel, directly impacting output and costs. The splashing process also entrains air and slag, causing secondary oxidation of the molten steel, increasing H and N content, forming porosity or inclusions, and ultimately affecting the quality of the finished product. The single-path buffer design of traditional tundish flow stabilizers easily creates localized eddies, leading to secondary entrainment of inclusions. Therefore, a new type of flow stabilizer is urgently needed that combines efficient molten steel kinetic energy attenuation with uniform molten steel flow field distribution.

[0038] The following is in conjunction with the appendix Figures 1 to 3 This application provides a detailed description of an intermediate liner stabilizer that integrates a spiral flow guide structure and a honeycomb flow guide structure, through specific embodiments and application scenarios.

[0039] Example 1

[0040] A tundish flow stabilizer includes a flow stabilizer body 1, with a cavity penetrating the flow stabilizer body 1 for molten steel to flow through; it also includes a guide channel 5 disposed within the cavity for guiding the flow of molten steel; the guide channel 5 extends spirally and is arranged near the inlet of the cavity; a guide fluid 6 is disposed within the cavity and has multiple guide holes 7 for molten steel to pass through; the guide fluid 6 is arranged near the outlet of the cavity.

[0041] That is, the cavity on the main body 1 of the flow stabilizer includes a liquid inlet 2, a mounting cavity 3 and a liquid outlet 4. The liquid inlet 2 is located at the top of the main body 1 of the flow stabilizer, the mounting cavity 3 is located below the liquid inlet 2 and is located inside the main body 1 of the flow stabilizer, and the liquid outlet 4 is located below the mounting cavity 3. The liquid inlet 2, the mounting cavity 3 and the liquid outlet 4 are connected in sequence.

[0042] The liquid outlet 4 extends horizontally from the mounting cavity 3 to the side wall of the flow stabilizer body 1. The liquid outlet 4 is radially positioned through the flow stabilizer body 1 and is located near the bottom of the guide fluid 6. The mounting cavity 3 contains a guide groove 5 and a guide fluid 6 arranged sequentially from top to bottom. The guide groove 5 has a spiral structure with a hollow inner ring. Multiple guide holes 7 are vertically oriented along the guide fluid 6. The structure of the guide groove 5 is essentially similar to the spiral structure of a spring.

[0043] The liquid inlet 2 is located near the top of the guide channel 5, and its cross-sectional dimensions on the horizontal plane gradually decrease from the top to the bottom of the stabilizer body 1. The inner wall of the liquid inlet 2 can extend along an arc or a straight line from top to bottom, preferably a straight line. That is, the radial projection of the liquid inlet along the stabilizer body is conical. Because the guide channel 5 and the guide fluid 6 are installed inside the stabilizer body 1, the height of the stabilizer body 1 is relatively higher than the original structure. By setting the liquid inlet 2 to an inverted conical shape, it is easier for the upper water inlet of the large bag to be inserted into the liquid inlet 2 of the stabilizer body 1.

[0044] In this scheme, the guide fluid 6 and the guide channel 5 are first installed sequentially inside the mounting cavity 3 of the stabilizer body 1. Then, the stabilizer body 1 is installed inside the tundish in the area impacted by molten steel, so that the outlet 4 on the stabilizer body 1 is located above the bottom wall of the tundish. Then, molten steel can be poured into the inlet 2 of the stabilizer body 1. During the pouring process, the molten steel enters the stabilizer body 1 from the inlet 2 and flows along the spiral guide channel 5 to form a swirling flow, and the kinetic energy is gradually absorbed. Through the synergistic effect of the spiral guide channel 5 and the guide fluid 6, the kinetic energy attenuation efficiency of the molten steel is greatly improved, and the amount of initial splashing is much lower than that of the traditional stabilizer structure. After being buffered by the guide channel 5 and the guide fluid 6, the molten steel flows into the tundish through the outlet 4. In addition, the multiple guide holes 7 on the guide fluid 6 disperse the molten steel into several smaller streams, which can eliminate large-scale eddies, make the molten steel flow field distribution more uniform, and increase the residence time of the molten steel, which is conducive to improving the flotation rate of inclusions in the molten steel. Among them, the spiral guide channel 5 can guide at least part of the fluid to rotate, converting the kinetic energy of the molten steel in the vertical direction into circumferential kinetic energy in the installation cavity 3, which can significantly reduce axial flow velocity fluctuations; the multi-stage spiral design of the spiral guide channel 5 limits the amplitude of molten steel fluid pressure pulsation by releasing kinetic energy step by step.

[0045] The mounting cavity 3 has a circular cross-sectional shape with a diameter of 240 mm. The height of the spiral groove can be 140-180 mm, and the groove depth can be 15-20 mm. The height of the guide fluid 6 can be 80-100 mm, and the diameter of the guide hole 7 can be 25-30 mm.

[0046] In a preferred embodiment, the outer walls of the guide channel 5 correspond to and fit snugly against the inner wall of the mounting cavity 3, allowing the guide channel 5 to be stably installed inside the mounting cavity 3. This facilitates a relatively stable swirling motion of the molten steel as it passes through the guide channel 5, gradually dissipating energy. The outer walls of the guide fluid 6 also correspond to and fit snugly against the inner wall of the mounting cavity 3, ensuring that the molten steel after passing through the guide channel 5 can only be discharged downwards to the outlet 4 through multiple guide holes 7 on the guide fluid 6. A mounting platform can be provided inside the mounting cavity 3 to facilitate the installation and placement of the guide fluid 6. Once the guide fluid 6 is in place, the guide channel 5 can be placed on top of the guide fluid 6. In other embodiments, the mounting cavity 3 can be configured with a structure that is wider at the top and narrower at the bottom, further facilitating the installation of the guide fluid 6 and the guide channel 5.

[0047] In a preferred embodiment, the liquid inlet 2 is an inverted cone shape, that is, the liquid inlet 2 is wider at the top and narrower at the bottom, and the cone angle of the liquid inlet 2 is 45°~60°.

[0048] Example 2

[0049] Based on Example 1, the difference in this example is that the projection of the guide hole along the axial direction of the guide flow is a regular hexagon, and the multiple guide holes 7 are arranged in a honeycomb pattern. The vortex formed in the hexagonal honeycomb channel can cause the local pressure drop of the water flow to reach 0.8-1.5 kPa. When the flow velocity exceeds 3 m / s, the van der Waals force adsorption effect causes the drag coefficient to increase sharply by 40%. The honeycomb structure has a significant inhibitory effect on the kinetic energy of molten steel.

[0050] Example 3

[0051] Based on Example 1, the difference in this example is that the side of the guide fluid 6 near the guide channel 5 is a spherical concave surface with a radius of curvature greater than or equal to 300 mm and a concave height of 20-30 mm. The spherical concave surface can buffer the molten steel falling from the guide channel 5 onto the top of the guide fluid 6. The curvature of the concave surface increases the contact area between the fluid and the wall, giving the spherical concave surface damping characteristics and facilitating the dissipation of the kinetic energy of the molten steel. In addition, the radial secondary flow induced by the concave surface will generate transverse vortices, further increasing the frictional resistance, facilitating the further consumption of the kinetic energy of the molten steel, slowing down the flow speed of the molten steel, and thus prolonging the residence time of the molten steel in the main body 1 of the flow stabilizer, making it easier for inclusions in the molten steel to float to the surface.

[0052] This utility model also provides an tundish, including the aforementioned tundish flow stabilizer, which is installed at the bottom of the tundish at the molten steel impact point.

[0053] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0054] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0055] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A tundish current stabilizer, characterized in that, include: The main body of the flow stabilizer (1) is provided with a cavity that runs through the main body of the flow stabilizer (1) to allow molten steel to flow; A flow guide (5) is provided in the cavity to guide the flow of molten steel; the flow guide (5) extends in a spiral shape and is arranged close to the inlet of the cavity; A guide fluid (6) is provided in the cavity and has multiple guide holes (7) for molten steel to pass through; the guide fluid (6) is arranged near the outlet of the cavity.

2. The intermediate current stabilizer according to claim 1, characterized in that, The cavity has a liquid outlet (4), which is located near the bottom of the fluid guide (6); The liquid outlet (4) extends through the flow stabilizer body (1) radially.

3. The intermediate current stabilizer according to claim 2, characterized in that, The cavity also has a liquid inlet (2), which is located near the top of the guide channel (5); The diameter of the liquid inlet (2) gradually decreases from the top of the flow stabilizer body (1) to the bottom of the flow stabilizer body (1).

4. The intermediate current stabilizer according to claim 3, characterized in that, The liquid inlet section (2) is cone-shaped when projected radially along the main body (1) of the flow stabilizer.

5. A tundish current stabilizer according to claim 2, characterized in that, The top of the guide fluid (6) is provided with a spherical concave surface to buffer molten steel falling from the guide groove (5) onto the top of the guide fluid (6).

6. The intermediate current stabilizer according to claim 1, characterized in that, The projection of the guide hole (7) along the axial direction of the guide fluid (6) is a regular hexagon.

7. A tundish current stabilizer according to claim 6, characterized in that, The multiple flow guide holes (7) are arranged in a honeycomb pattern.

8. A tundish current stabilizer according to claim 4, characterized in that, The radial conical projection of the main body (1) of the current stabilizer has a taper of 45°~60°.

9. A tundish current stabilizer according to claim 5, characterized in that, The radius of curvature of the spherical concave surface is greater than or equal to 300 mm, and the concave surface height is 20~30 mm.

10. An intermediate package, characterized in that, Includes the intermediate package current stabilizer as described in any one of claims 1-9.

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