Flow guide pipe of electromagnetic stirring tundish

Abstract

The utility model discloses a flow guide pipe of an electromagnetic stirring tundish, which comprises a pipe body, a steel flowing hole is arranged in the pipe body along the length direction of the pipe body, the inlet end of the steel flowing hole penetrates through one end part of the pipe body, a first steel tapping hole is arranged on the wall surface of one side of the pipe body, and a second steel tapping hole is arranged on the wall surface of the other side of the pipe body. A second steel tapping hole is formed in the side wall face, opposite to the first steel tapping hole, of the pipe body, the first steel tapping hole and the second steel tapping hole are both communicated with fluid of the steel flowing hole, and the height of the first steel tapping hole and the height of the second steel tapping hole are gradually increased from the inlet end to the outlet end. And the axis height of the steel flowing hole is gradually increased from the inlet end to the outlet end. By arranging the upwards inclined steel flowing hole, the upwards raised steel tapping hole and the angle matched with the specific size of the steel tapping hole, circulation of molten steel in the tundish can be enhanced, so that the size of a dead zone is reduced, and by arranging the pipe body, upward floating of steel slag during electromagnetic stirring is enhanced, the impurity removal rate is increased, and the quality of the molten steel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical refractory materials, and is specifically a flow guide tube for an electromagnetic stirring ladle. Background Art

[0002] Electromagnetic stirring uses electromagnetic force to drive the movement of molten steel in the liquid phase hole in the tundish to enhance the convection, heat transfer and mass transfer of molten steel. The flow nozzle of the guide pipe distributes molten steel to each nozzle. The size design of the guide pipe has a crucial influence on the flow field of molten steel in the tundish, the dead zone volume and the inclusion removal rate. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to provide a flow guide tube for an electromagnetic stirring tundish which can improve the quality of molten steel in the tundish.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a flow guide tube for an electromagnetic stirring ladle, comprising a tube body, a steel flow hole is opened in the tube body along its length direction, the inlet end of the steel flow hole passes through one end portion of the tube body, a first steel tapping hole is opened on one side wall of the tube body, a second steel tapping hole is opened on the side wall of the tube body opposite to the first steel tapping hole, the first steel tapping hole and the second steel tapping hole are both fluidically conductive with the steel flow hole, the first steel tapping hole and the second steel tapping hole gradually increase in height from the inlet end to the outlet end, and the axial height of the steel flow hole gradually increases from the inlet end to the outlet end.

[0005] A flow guide tube for electromagnetic stirring ladle, wherein the angle between the axis of the flow steel hole and the horizontal plane is 2°, and the outlet end of the flow steel hole is 54mm higher than the inlet end of the flow steel hole. The flow steel hole gradually rises, which can prevent the impact on the bottom of the ladle from causing damage to the ladle, and promote the formation of a good flow field, uniform composition and temperature, and promote the floating of inclusions.

[0006] A flow guide pipe for an electromagnetic stirring ladle, in a cross section perpendicular to the center line of the flow guide pipe: the angle c between the axis of the first tapping hole and the horizontal plane is 5°, and the angle d between the axis of the second tapping hole and the horizontal plane is also 5°. The first tapping hole and the second tapping hole are raised, which can further prevent the impact on the bottom of the ladle from causing damage to the ladle, and further promote the formation of a good flow field.

[0007] A flow guide tube for an electromagnetic stirring bag, wherein the diameter of the flow steel hole is 162 mm.

[0008] A flow guide pipe of an electromagnetic stirring ladle, wherein the diameter of the first steel tapping hole and the diameter of the second steel tapping hole are both 162 mm.

[0009] A flow guide pipe of an electromagnetic stirring ladle, wherein on a horizontal plane passing through the center line of the flow guide pipe: an angle a between the axis of the first steel tapping hole and the axis of the second steel tapping hole is 165°.

[0010] A guide tube for an electromagnetic stirring ladle, on a horizontal plane passing through the center line of the guide tube: the axis of the first steel tapping hole is perpendicular to the center line of the guide tube, and the outlet end of the second steel tapping hole is inclined in a direction away from the inlet end of the steel flow hole, that is, the outlet end of the second steel tapping hole is offset from a direction perpendicular to the center line of the guide tube toward an extension line of the flow direction of molten steel in the steel flow hole.

[0011] A flow guide pipe of an electromagnetic stirring ladle, wherein on a horizontal plane passing through the center line of the flow guide pipe: an angle b between the axis of the second steel tapping hole and the center line of the flow guide pipe is 75 degrees.

[0012] A flow guide tube for an electromagnetic stirring ladle, wherein the length of the tube body is 1800 mm.

[0013] A flow guide tube for an electromagnetic stirring ladle, wherein the angle e between the side wall surface of the tube body on which the first steel tapping hole is opened and the plane where the bottom wall of the tube body is located is 80°, and the angle f between the side wall surface of the tube body on which the second steel tapping hole is opened and the plane where the bottom wall of the tube body is located is 85°.

[0014] A flow guide tube for an electromagnetic stirring ladle, which is cast and made of corundum spinel or corundum mullite (Al 2 O 3 ≥80%, MgO≤10% or Al 2 O 3 +S i O 2 ≥80%).

[0015] The technical solution of the utility model has achieved the following beneficial technical effects:

[0016] 1. By setting an upwardly inclined steel flow hole and an upwardly rising steel tapping hole, and matching the angle of the specific size of the steel tapping hole, the circulation of molten steel in the tundish can be strengthened, thereby reducing the dead zone volume, and by setting a tube body, the floating of slag during electromagnetic stirring is strengthened, the impurity removal rate is improved, and the quality of molten steel is improved; when used, this structure further optimizes the flow field of the tundish, improves the inclusion removal rate, and thus improves the quality of steel. The use of this structure can improve the removal of inclusions of different particle sizes to a certain extent, especially the removal of large-size inclusions, and the improvement effect is more obvious.

[0017] 2. The guide pipe of this structure makes electromagnetic stirring have a better heat supplement effect, and at the same time optimizes the flow field of the tundish so that the temperature of the steel flow from the guide pipe entering each water outlet of the tundish is basically the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural schematic diagram of the utility model;

[0019] Figure 2 A front view structural schematic diagram of the utility model;

[0020] Figure 3 A schematic diagram of the cross-sectional structure of the utility model;

[0021] Figure 4 A side structural schematic diagram of the utility model;

[0022] Figure 5 A schematic diagram of the center line of the flow guide tube of the utility model;

[0023] Figure 6 Original three-dimensional spatial model of the watershed;

[0024] Figure 7 Overall flow diagram;

[0025] Figure 8 Velocity vector diagram of symmetry surface;

[0026] Fig. 9 Velocity vector diagram of the cross section where the stopper rod is located;

[0027] Fig.10 Liquid surface velocity cloud diagram;

[0028] Fig.11 RTD curves for each stream.

[0029] The reference numerals in the figure are as follows: 1-tube body; 2-steel flow hole; 3-first steel outlet hole; 4-second steel outlet hole; 5-center line of the guide pipe. DETAILED DESCRIPTION

[0030] A flow guide tube for an electromagnetic stirring package in this embodiment, see Figure 1 , comprising a tube body 1, wherein a steel flow hole 2 is provided in the tube body 1 along its length direction, the inlet end of the steel flow hole 2 passes through one end of the tube body 1, a first steel tapping hole 3 is provided on one side wall of the tube body 1, and a second steel tapping hole 4 is provided on the side wall of the tube body 1 opposite to the first steel tapping hole 3, the first steel tapping hole 3 and the second steel tapping hole 4 are both fluidly connected with the steel flow hole 2, the first steel tapping hole 3 and the second steel tapping hole 4 gradually increase in height from the inlet end to the outlet end, and the axial height of the steel flow hole 2 gradually increases from the inlet end to the outlet end, and by providing an upwardly inclined steel flow hole and an upwardly rising steel tapping hole, and matching the angle of the specific size of the steel tapping hole, the circulation of molten steel in the tundish can be enhanced, thereby reducing the dead zone volume.

[0031] like Figure 4As shown, the angle between the axis of the steel flow hole 2 and the horizontal plane is 2°, and the outlet end of the steel flow hole 2 is 54 mm higher than the inlet end of the steel flow hole 2. By setting the tube body, the floating of steel slag during electromagnetic stirring is enhanced, the impurity removal rate is improved, and the quality of molten steel is improved.

[0032] like Figure 2 As shown, on the cross section perpendicular to the center line 5 of the guide tube: the angle c between the axis of the first steel tapping hole 3 and the horizontal plane is 5°, and the angle d between the axis of the second steel tapping hole 4 and the horizontal plane is also 5°.

[0033] like Figure 3 As shown, the diameter of the steel flow hole 2 is 162 mm, the diameter of the first steel outlet hole 3 and the diameter of the second steel outlet hole 4 are both 162 mm, and the length of the tube body 1 is 1800 mm.

[0034] like Figure 3 As shown, on the horizontal plane passing through the center line 5 of the guide pipe: the angle a between the axis of the first steel tapping hole 3 and the axis of the second steel tapping hole 4 is 165°.

[0035] like Figure 3 As shown, on the horizontal plane passing through the center line 5 of the guide pipe: the axis of the first steel tapping hole 3 is perpendicular to the center line 5 of the guide pipe, and the outlet end of the second steel tapping hole 4 is inclined toward the direction away from the inlet end of the steel flow hole 2, that is, the outlet end of the second steel tapping hole 4 is offset from the direction perpendicular to the center line 5 of the guide pipe toward the extension line of the flow direction of the molten steel in the steel flow hole 2, and on the horizontal plane passing through the center line 5 of the guide pipe: the angle b between the axis of the second steel tapping hole 4 and the center line 5 of the guide pipe is 75°.

[0036] like Figure 2 As shown, the angle e between the side wall surface of the tube body 1 having the first steel tapping hole 3 and the plane where the bottom wall of the tube body 1 is located is 80°, and the angle f between the side wall surface of the tube body 1 having the second steel tapping hole 4 and the plane where the bottom wall of the tube body 1 is located is 85°.

[0037] Simulation test of flow field of the middle package using the flow guide tube of the middle package with electromagnetic stirring of the present embodiment

[0038] 1. The specific test parameters are shown in Table 1 below:

[0039] Table 1 Parameters required for the test

[0040]

[0041]

[0042] 2. Simulation Analysis

[0043] 2.1 CAD digital object modeling

[0044] The flow field is a space domain filled with fluid, so the CAD model is a complex geometric body filled with molten steel. Considering the symmetric characteristics of the flow field space, 1 / 2 of the flow field space is taken as the calculation object, and the symmetry surface is processed using a numerical symmetry boundary. The original three-dimensional space model of the flow field is as follows Figure 6 As shown:

[0045] 2.2 CAE Digital Object Modeling

[0046] The test object is divided into tetrahedral grids, and the number of grids is about 750,000.

[0047] 2.3 CAE Model

[0048] In this experiment, the Stokes equations were used to describe the flow phenomenon of molten steel. The finite volume method was used for calculation. The k-ε double equation mathematical model was used to describe the turbulent flow characteristics of molten steel. The turbulent flow in the near-wall area was treated with an optimized wall function.

[0049] 2.4 Boundary Conditions

[0050] According to the working conditions of the test object in service, the boundary conditions are set. For details, please see the table below:

[0051] Table 2 Boundary conditions

[0052] area Boundary conditions parameter Entrance Speed ​​​​entry Speed ​​is calculated from casting parameters Free surface Free slip wall Tundish wall No-slip wall Symmetrical plane Symmetrical Boundary exit Open Borders Relative pressure is 0

[0053] 3. Results of Flow Field of Liquid Steel in Tundish

[0054] In order to intuitively display the flow field results, streamline diagram and vector diagram are used to describe the calculation results. The details are as follows:

[0055] 3.1. The overall streamline diagram is as follows Figure 7 shown.

[0056] 3.2. The velocity vector diagram of the symmetry surface is shown in Figure 8 shown.

[0057] 3.3、The velocity vector diagram of the cross section where the stopper rod is located is as follows Fig. 9 shown.

[0058] 3.4、Liquid surface velocity cloud diagram Fig.10 shown.

[0059] 4. Experimental Results Analysis

[0060] 4.1、RTD curve analysis Fig.11 The RTD curve analysis results are shown in Table 3.

[0061] Table 3 RTD curve analysis results

[0062] 4.2. Analysis of inclusion removal rate is shown in Table 4 Table 4 Calculation results of inclusion removal rate

[0063]

[0064] The flow guide tube of the electromagnetic stirring tundish in this embodiment further optimizes the tundish flow field when used in the tundish, improves the inclusion removal rate, and thus improves the quality of steel. The structure can improve the removal of inclusions of different particle sizes to a certain extent, especially for the removal of large particle size inclusions, and the improvement effect is more obvious. Overall, the residence time of each flow of molten steel in the tundish using this structure is another beneficial attempt to eliminate the dead zone, and the overall average residence time and the dead zone volume are almost the same.

[0065] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A flow guide tube for an electromagnetic stirring ladle, characterized in that: The invention comprises a tube body (1), wherein a steel flow hole (2) is provided in the tube body (1) along its length direction, the inlet end of the steel flow hole (2) passes through one end of the tube body (1), a first steel tapping hole (3) is provided on one side wall of the tube body (1), and a second steel tapping hole (4) is provided on the side wall of the tube body (1) opposite to the first steel tapping hole (3), the first steel tapping hole (3) and the second steel tapping hole (4) are both fluidically connected to the steel flow hole (2), the heights of the first steel tapping hole (3) and the second steel tapping hole (4) gradually increase from the inlet end to the outlet end, and the height of the axis of the steel flow hole (2) gradually increases from the inlet end to the outlet end.

2. The flow guide tube of the electromagnetic stirring ladle according to claim 1, characterized in that: The angle between the axis of the steel flow hole (2) and the horizontal plane is 2°, and the outlet end of the steel flow hole (2) is 54 mm higher than the inlet end of the steel flow hole (2).

3. The flow guide tube of the electromagnetic stirring ladle according to claim 1, characterized in that: On a cross section perpendicular to the center line (5) of the guide tube: the angle c between the axis of the first steel tapping hole (3) and the horizontal plane is 5°, and the angle d between the axis of the second steel tapping hole (4) and the horizontal plane is also 5°.

4. The flow guide tube of the electromagnetic stirring ladle according to claim 1, characterized in that: The diameter of the steel flow hole (2) is 162 mm.

5. The flow guide tube of the electromagnetic stirring ladle according to claim 1, characterized in that: The diameter of the first steel tapping hole (3) and the diameter of the second steel tapping hole (4) are both 162 mm.

6. The flow guide tube of the electromagnetic stirring ladle according to claim 1, characterized in that: On a horizontal plane passing through the center line (5) of the guide pipe: the angle a between the axis of the first steel tapping hole (3) and the axis of the second steel tapping hole (4) is 165°.

7. The flow guide tube of the electromagnetic stirring ladle according to claim 1, characterized in that: On a horizontal plane passing through the center line (5) of the guide tube: the axis of the first steel tapping hole (3) is perpendicular to the center line (5) of the guide tube, and the outlet end of the second steel tapping hole (4) is inclined in a direction away from the inlet end of the steel flow hole (2), that is, the outlet end of the second steel tapping hole (4) is offset from a direction perpendicular to the center line (5) of the guide tube towards an extension line of the flow direction of the molten steel in the steel flow hole (2).

8. The flow guide tube of the electromagnetic stirring ladle according to claim 7, characterized in that: On a horizontal plane passing through the center line (5) of the guide pipe: the angle b between the axis of the second steel tapping hole (4) and the center line (5) of the guide pipe is 75°.

9. A flow guide tube for an electromagnetic stirring ladle according to any one of claims 1 to 8, characterized in that: The length of the tube body (1) is 1800 mm.

10. A flow guide tube for an electromagnetic stirring ladle according to any one of claims 1 to 8, characterized in that: The angle e between the side wall surface of the tube body (1) on which the first steel outlet hole (3) is formed and the plane on which the bottom wall of the tube body (1) is located is 80°, and the angle f between the side wall surface of the tube body (1) on which the second steel outlet hole (4) is formed and the plane on which the bottom wall of the tube body (1) is located is 85°.

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