Device for inhibiting rotational flow of molten steel

Abstract

The utility model relates to a device for inhibiting rotational flow of molten steel, and belongs to the technical field of steelmaking production equipment in the metallurgical industry. According to the technical scheme, the device comprises an anti-vortex groove (1), an upper steel passing hole (2), a body (3), a middle steel passing hole (4) and a lower steel passing hole (5), the body (3) is installed at the bottom of a steel ladle, the body (3) is provided with the anti-vortex groove (1), the upper steel passing hole (2), the middle steel passing hole (4) and the lower steel passing hole (5) which are sequentially communicated from top to bottom and penetrate through the body (3), and the size of the lower steel passing hole (5) is matched with that of a water feeding opening of the steel ladle; the anti-vortex groove (1) is a rectangular groove, the upper steel through hole (2) is a big-end-up conical hole, and the middle steel through hole (4) is a cylindrical hole. The device has the beneficial effects that vortex slag entrapment at the last stage of steel ladle pouring can be inhibited, the residual steel amount of the steel ladle is reduced, the molten steel yield is improved, and meanwhile, the purity of the molten steel can be ensured.

Description

Technical Field

[0001] This utility model relates to a device for suppressing the swirling of molten steel, belonging to the technical field of steelmaking production equipment in the metallurgical industry. Background Technology

[0002] With the increasing sophistication of the equipment manufacturing industry, the requirements for steel performance and purity are becoming increasingly stringent. Continuous casting, as a crucial process for quality control, is the source of purity control in continuous casting, particularly in the ladle pouring stage, and it also significantly impacts the purity control of subsequent products. Towards the end of the ladle pouring process, when the molten steel level drops below a critical height, fluid vortices are generated on the surface, gradually evolving and developing into funnel-shaped vortices. Under the influence of the Coriolis force generated by the Earth's rotation, the vortex flows counterclockwise. During the pouring process, these vortices cause slag entrainment, resulting in some ladle slag entering the molten steel, severely affecting the purity of the steel and the quality of the product. Therefore, controlling slag entry into the ladle is extremely important during the steel pouring process.

[0003] Traditional methods for controlling slag discharge from molten steel ladles involve detection. If slag is detected in the steel stream, pouring is immediately stopped. For steel grades with strict quality requirements, a residual steel method is typically used. Pouring is stopped just before the molten steel level in the ladle reaches the critical height necessary to form a vortex, preventing slag from being trapped in the vortex and affecting the purity of the molten steel. However, this inevitably results in some molten steel remaining in the ladle that cannot be poured, leading to increased costs. Therefore, how to control slag discharge from molten steel ladles while minimizing residual steel, ensuring steel purity, and pouring as much molten steel as possible to reduce costs has become a key research focus for steel companies.

[0004] Patent CN202111522249.5, "A Method for Controlling Slag Entrainment in the Later Stages of Steel Ladle Casting," discloses a method for controlling slag entrainment in the later stages of steel ladle casting, comprising the following steps: after the construction and baking of the permanent layer of the ladle, installing permeable seat bricks and bottom impact blocks, reserving installation positions for anti-vortex dams, starting the casting of the bottom working layer, and removing the mold for the reserved anti-vortex dam installation positions after 12 hours of curing; casting the working layer of the ladle wall with formwork, and demolding after 12 hours of curing; and placing the anti-vortex dam, The pre-reserved position of the nozzle seat brick is cleaned. First, the anti-vortex dam is hoisted to the designated position and lowered, and then the nozzle seat brick is hoisted and installed. The anti-vortex dam is installed on one side of the nozzle seat brick and close to the working layer of the ladle wall, and the anti-vortex dam is parallel to the nozzle seat brick. The bottom casting refractory is used for casting. In the later stage of ladle casting, this method can reduce the increase of vortices around the nozzle caused by the drop in the molten steel level, effectively reduce the amount of slag entrainment in the molten steel, improve the quality of molten steel, and reduce the amount of casting residue. However, the use of the anti-vortex dam will lead to an increase in cost.

[0005] Patent CN201610738453.3, "A Method for Suppressing Eddy Slag Entrainment at the End of Steel Ladle Tapping," describes a method that involves encapsulating an electromagnetic stirrer in the lower part of the ladle's base brick, filling the gap between the stirrer and the base brick with heat-insulating refractory material, and providing power and cooling pipe outlets on the bottom shell of the ladle. When the electromagnetic stirrer is not in operation, it is cooled by blowing nitrogen gas at a pressure of 0.3–0.5 MPa through the cooling pipes. After tapping, when the molten steel in the ladle reaches one-third of its total height, the electromagnetic stirrer is activated to agitate the molten steel at the tapping spout and suppress vortex formation. The electromagnetic stirrer has a power of 30–100 kW and a power frequency of 5–20 Hz, and is simultaneously cooled with air pressure of 0.5–0.8 MPa. After all the molten steel has been tapped, the tapping spout is closed, and the power to the electromagnetic stirrer is turned off, while the stirrer continues to be cooled by air. This method effectively suppresses vortex formation and reduces slag entrainment. This method involves complex equipment, is inconvenient to maintain and use, and also increases costs.

[0006] Patent CN201010292947.6, "A Vortex-Free Ladle and Its Working Method," includes a sliding nozzle and a main nozzle. An annular flow-guiding protrusion is provided at the bottom of the ladle, and a spiral-shaped flow-disrupting protrusion is provided above the sliding nozzle and the main nozzle. The annular flow-guiding protrusion at the bottom of the ladle and the spiral-shaped flow-disrupting protrusion above the sliding nozzle and the main nozzle are arranged in opposite directions. When molten steel is discharged, it is affected by the combined action of the annular flow-guiding protrusion at the bottom of the ladle and the spiral-shaped flow-disrupting protrusions arranged in opposite directions above the sliding nozzle and the main nozzle. According to the principle of conservation of angular momentum, the momentum of the molten steel flowing in two different directions cancels each other out, suppressing or eliminating the generation of vortices. This is mainly achieved by modifying the bottom of the ladle and using the protrusions to reduce vortices. Utility Model Content

[0007] The purpose of this invention is to provide a device for suppressing the swirling of molten steel, which can suppress vortex slag entrainment at the end of ladle pouring, reduce the amount of residual steel in the ladle, improve the steel yield, and at the same time ensure the purity of molten steel, thus solving the problems existing in the background art.

[0008] The technical solution of this utility model is:

[0009] A device for suppressing swirling of molten steel includes an anti-vortex groove, an upper steel passage hole, a body, a middle steel passage hole, and a lower steel passage hole. The body is installed at the bottom of the ladle. The body has an anti-vortex groove, an upper steel passage hole, a middle steel passage hole, and a lower steel passage hole that are connected and penetrate the body from top to bottom. The size of the lower steel passage hole matches the upper water inlet of the ladle.

[0010] The anti-vortex groove is a rectangular groove, the upper through hole is a conical hole that is larger at the top and smaller at the bottom, and the middle through hole is a cylindrical hole.

[0011] The anti-vortex groove is a rectangular groove with four concave arc surfaces on its four sides. The upper through-hole is a conical hole that is larger at the top and smaller at the bottom, and the middle through-hole is a cylindrical hole.

[0012] The anti-vortex groove is rhomboid in shape, with the upper steel passage hole being a conical hole that is larger at the top and smaller at the bottom, and the middle steel passage hole being a cylindrical hole.

[0013] The anti-vortex groove is a rectangular groove, the upper through-hole is a rectangular hole that is larger at the top and smaller at the bottom, and the middle through-hole is a rectangular hole.

[0014] The anti-vortex groove is a rectangular groove with four concave arc-shaped surfaces on its four sides. The upper through-hole is a rectangular hole that is larger at the top and smaller at the bottom, and the middle through-hole is a rectangular hole.

[0015] The anti-vortex groove is rhomboid in shape, with a rectangular hole at the top (larger at the top and smaller at the bottom) and a rectangular hole in the middle.

[0016] When using this utility model, the ladle top inlet is installed in the lower steel passage hole of the device, and the ladle bottom inlet is connected to the ladle top inlet through a sliding plate mechanism. At the end of the ladle pouring, the anti-vortex groove changes the flow field of the molten steel, interrupts the flow inertia of the molten steel, and prevents the molten steel from forming vortices.

[0017] The beneficial effects of this utility model are: it can suppress vortex slag entrainment at the end of ladle casting, reduce the amount of residual steel in the ladle, improve the steel yield, and at the same time ensure the purity of the molten steel. Attached Figure Description

[0018] Figure 1 This is a front view of Embodiment 1 of the present utility model;

[0019] Figure 2 This is a top view of one embodiment of the present utility model;

[0020] Figure 3 This is a front view of Embodiment 2 of the present utility model;

[0021] Figure 4 This is a top view of Embodiment 2 of the present utility model;

[0022] Figure 5 This is a front view of Embodiment 3 of the present utility model;

[0023] Figure 6 This is a top view of embodiment three of the present utility model;

[0024] Figure 7 This is a front view of Embodiment 4 of the present utility model;

[0025] Figure 8 This is a top view of embodiment four of the present utility model;

[0026] Figure 9This is a front view of Embodiment 5 of the present utility model;

[0027] Figure 10 This is a top view of embodiment five of the present utility model;

[0028] Figure 11 This is a front view of Embodiment Six of this utility model;

[0029] Figure 12 This is a top view of embodiment six of the present utility model;

[0030] Figure 13 This is a schematic diagram of the usage state of this utility model;

[0031] In the diagram: 1. Anti-vortex channel; 2. Upper steel passage hole; 3. Body; 4. Middle steel passage hole; 5. Lower steel passage hole; 6. Ladle inlet; 7. Upper sliding plate; 8. Lower sliding plate; 9. Ladle outlet. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and examples.

[0033] See attached document Figure 1-13 A device for suppressing swirling of molten steel includes an anti-vortex groove 1, an upper steel passage hole 2, a body 3, a middle steel passage hole 4, and a lower steel passage hole 5. The body 3 is installed at the bottom of the ladle. The body 3 is provided with an anti-vortex groove 1, an upper steel passage hole 2, a middle steel passage hole 4, and a lower steel passage hole 5 that are connected and penetrate the body 3 from top to bottom. The size of the lower steel passage hole 5 is matched with the upper water inlet of the ladle. Example 1

[0034] See attached document Figure 1 , 2 The vortex groove 1 is a rectangular groove, the upper steel passage hole 2 is a conical hole with a larger top and a smaller bottom, the middle steel passage hole 4 is a cylindrical hole, and the inner diameter of the lower steel passage hole 5 is 3-5mm larger than the outer diameter of the ladle's upper water inlet. Example 2

[0035] See attached document Figure 3 , 4 The vortex groove 1 is a rectangular groove, and the four sides of the rectangular groove are inwardly concave arc surfaces, otherwise the same as in Embodiment 1. Example 3

[0036] See attached document Figure 5 , 6 The vortex groove 1 is rhomboid, and the rest is the same as in Example 1. Example 4

[0037] See attached document Figure 7 , 8The vortex channel 1 is a rectangular channel, the upper steel passage hole 2 is a rectangular hole that is larger at the top and smaller at the bottom, the middle steel passage hole 4 is a rectangular hole, and the inner diameter of the lower steel passage hole 5 is 3-5mm larger than the outer diameter of the ladle's upper water inlet. Example 5

[0038] See attached document Figure 9 , 10 The vortex groove 1 is a rectangular groove, and the four sides of the rectangular groove are inwardly concave arc surfaces, and the rest is the same as in Embodiment 4. Example 6

[0039] See attached document Figure 11 , 12 The vortex groove 1 is rhomboid, and the rest is the same as in Example 4.

[0040] The specific usage method is as follows:

[0041] See attached document Figure 13 During the ladle construction process, the main body 3 of this device is installed at the bottom of the ladle, replacing the traditional ladle seat bricks. The ladle inlet 6 is installed in the lower steel passage hole 5 of the main body 3. The upper slide plate 7 and lower slide plate 8 are installed below the ladle inlet 6, and the ladle outlet 9 is installed on the lower slide plate 8. During pouring, the slide plates are opened, and the molten steel flows out of the ladle through the anti-vortex groove 1, the upper steel passage hole 2, the middle steel passage hole 4, the ladle inlet 6, and the ladle outlet 9. At the end of the ladle pouring, the anti-vortex groove changes the flow field of the molten steel, interrupts the flow inertia of the molten steel, and prevents the molten steel from forming vortices.

[0042] This device suppresses vortex slag entrainment at the end of ladle pouring without increasing costs, thereby reducing the amount of residual steel in the ladle, increasing steel yield, and ensuring the purity of the molten steel. Specific effects are as follows:

[0043] (1) Using this device, based on a 120-140t ladle, the average amount of leftover steel in the ladle is reduced by 2.06t, and the billet yield is increased by 1.5%, which can effectively reduce production costs.

[0044] (2) By using this device, the purity of the product is improved, the level of Class B inclusions is reduced by an average of 0.26 levels, and the level of Class D inclusions is reduced by an average of 0.09 levels.

Claims

1. A device for suppressing the swirling flow of molten steel, characterized in that: It includes an anti-vortex groove (1), an upper steel passage hole (2), a body (3), a middle steel passage hole (4) and a lower steel passage hole (5). The body (3) is installed at the bottom of the ladle. The body (3) is provided with an anti-vortex groove (1), an upper steel passage hole (2), a middle steel passage hole (4) and a lower steel passage hole (5) that are connected and penetrate the body (3) from top to bottom. The size of the lower steel passage hole (5) is matched with the water inlet of the ladle.

2. The device for suppressing molten steel swirling according to claim 1, characterized in that: The anti-vortex groove (1) is a rectangular groove, the upper through-hole (2) is a conical hole with a larger upper part and a smaller lower part, and the middle through-hole (4) is a cylindrical hole.

3. The device for suppressing molten steel swirling according to claim 1, characterized in that: The anti-vortex groove (1) is a rectangular groove with four concave arc surfaces on its four sides. The upper through-hole (2) is a conical hole with a larger upper part and a smaller lower part, and the middle through-hole (4) is a cylindrical hole.

4. The device for suppressing molten steel swirling according to claim 1, characterized in that: The anti-vortex groove (1) is rhomboid, the upper through-hole (2) is a conical hole with a larger upper part and a smaller lower part, and the middle through-hole (4) is a cylindrical hole.

5. The device for suppressing molten steel swirling according to claim 1, characterized in that: The anti-vortex groove (1) is a rectangular groove, the upper through-hole (2) is a rectangular hole with a larger upper part and a smaller lower part, and the middle through-hole (4) is a rectangular hole.

6. The device for suppressing molten steel swirling according to claim 1, characterized in that: The anti-vortex groove (1) is a rectangular groove with four concave arc surfaces. The upper through-hole (2) is a rectangular hole with a larger upper part and a smaller lower part, and the middle through-hole (4) is a rectangular hole.

7. The device for suppressing molten steel swirling according to claim 1, characterized in that: The anti-vortex groove (1) is rhomboid, the upper through-hole (2) is a rectangular hole with a larger upper part and a smaller lower part, and the middle through-hole (4) is a rectangular hole.

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