Induction coil protector for electromagnetic stirring tundish

Abstract

The utility model discloses an electromagnetic stirring tundish induction coil protection piece which comprises an impact area protection plate and a pouring area protection plate, and an electromagnetic stirring tundish induction coil is located in a space defined by the impact area protection plate and the pouring area protection plate. The casting area protection plate comprises a first head section, a first arc-shaped connecting section and a first tail section; the impact area protection plate comprises a second head section, a second arc-shaped connecting section, a transition connecting section, a third arc-shaped connecting section and a second tail section. The tundish can protect the induction coil, improve a molten steel flow field in the tundish and reduce molten steel scouring.

Description

Technical Field

[0001] The utility model relates to the technical field of steelmaking equipment, and is specifically an electromagnetic stirring induction coil protection part. Background Art

[0002] The electromagnetic stirring tundish uses the transformer principle. When the induction coil is connected to the alternating current, it is equivalent to the primary circuit, and the molten steel in the tundish is equivalent to the secondary circuit, so that an induced current is generated in the molten steel in the tundish and a circuit is formed in the tundish to compensate for the heat loss of the molten steel in the tundish, which is beneficial to the mixing of the molten steel and thus makes the temperature distribution more uniform. At the same time, it promotes the floating of inclusions in the molten steel in the impact zone and the pouring zone, optimizes the molten steel temperature and flow field distribution, and accurately controls the pouring temperature. The induction coil is located in the impact zone of the tundish, and a protective part with a reasonable structure needs to be designed to surround the induction coil, reduce the erosion of the molten steel on the refractory materials around the induction coil, and increase the service life of the tundish. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to provide an electromagnetic stirring tundish induction coil protection member which can protect the induction coil, improve the molten steel flow field in the tundish, and reduce the erosion of the molten steel.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] An electromagnetic stirring induction coil protection member comprises an impact zone protection plate and a pouring zone protection plate, wherein the electromagnetic stirring induction coil is located in a space enclosed by the impact zone protection plate and the pouring zone protection plate;

[0006] The pouring area protection plate includes a first head section, a first arc-shaped connecting section and a first tail section, wherein the first arc-shaped connecting section is located between the first head section and the first tail section and its two ends are connected to the first head section and the first tail section respectively; the length L1 of the upper end surface of the first head section is greater than 1500 mm, the length L2 of the upper end surface of the first tail section is greater than 700 mm, the arc length L3 of the first arc-shaped connecting section is greater than 130 mm, the angle between the first head section and the first tail section is greater than 160°, and the thickness of the first head section, the first arc-shaped connecting section and the first tail section is 70-80 mm;

[0007] The impact zone protection plate includes a second head section, a second arc-shaped connecting section, a transition connecting section, a third arc-shaped connecting section and a second tail section. The second arc-shaped connecting section is located between the second head section and the transition connecting section, and its two ends are respectively connected to the second head section and the transition connecting section. The third arc-shaped connecting section is located between the transition connecting section and the second tail section, and its two ends are respectively connected to the transition connecting section and the second tail section. The arc length of the second arc-shaped connecting section is 130-135mm, and the arc length of the third arc-shaped connecting section is 220-225mm. The length of the second head section is 295-320mm, the length of the transition connecting section is 295-354mm, and the length of the second tail section is 1181-1186mm.

[0008] The electromagnetic stirring includes an induction coil protection member, the upper end surface length L1 of the first head section is 1534 mm, the upper end surface length L2 of the first tail section is 702 mm, the arc length L3 of the first arc-shaped connecting section is 131 mm, and the radius R1 of the arc where the first arc-shaped connecting section is located is 500 mm, the angle A between the first head section and the first tail section is 165°, and the thickness L6 of the first head section, the first arc-shaped connecting section and the first tail section is 80 mm; the overall height L7 of the casting area protection plate is 1150 mm.

[0009] The electromagnetic stirring device includes an induction coil protection member, and the upper end surfaces of the first head section, the first arc-shaped connecting section and the first tail section are flush.

[0010] In the electromagnetic stirring device, the induction coil protection member is included, and the lower end surface of the first head section, the lower end surface of the first arc-shaped connecting section, and the lower end surface of a section of the first tail section adjacent to the first arc-shaped connecting section are flush.

[0011] The electromagnetic stirring device includes an induction coil protection member, and the lower part of the first tail section has a steel outlet channel notch, the height L4 of the steel outlet channel notch is 410 mm, and the width L5 is 383 mm; the side elevation of the first tail section above the steel outlet channel notch is an inclined surface, and the angle B between the inclined surface and the horizontal plane is 100°.

[0012] The electromagnetic stirring induction coil protection member is as follows: the side of the impact zone protection plate adjacent to the electromagnetic stirring induction coil is the inner side, and the side away from the electromagnetic stirring induction coil is the outer side; on the inner side: the length M1 of the second head section is 295mm, the length M2 of the transition connection section is 295mm, and the length M3 of the second tail section is 1181mm; on the outer side: the length M4 of the second head section is 320mm, the length M5 of the transition connection section is 354mm, and the length M6 of the second tail section is 1186mm.

[0013] The electromagnetic stirring includes an induction coil protection member, an angle C between the second head section and the transition connection section is 155°, an angle D between the transition connection section and the second tail section is 140°, and an angle E between the second head section and the second tail section is 115°.

[0014] The electromagnetic stirring includes an induction coil protection member, the thickness L6 of the impact zone protection plate is 105 mm, the overall height L7 is 1010 mm, the radius R2 of the arc where the second arc-shaped connecting section is located and the radius R3 of the arc where the third arc-shaped connecting section is located are both 300 mm.

[0015] The electromagnetic stirring device includes an induction coil protection member, and an installation groove is longitudinally opened on the upper edge of the outer plate surface of the second head section, and the groove depth of the installation groove is 55 mm; the upper end surfaces of the second arc-shaped connecting section, the transition connecting section, the third arc-shaped connecting section and the second tail section are flush, and the upper end surface of the second head section is 80 mm lower than the upper end surface of the transition connecting section.

[0016] The electromagnetic stirring device includes an induction coil protection member, and the lower part of the second tail section has a steel-outlet channel notch, the height L4 of the steel-outlet channel notch is 410 mm, and the width L5 is 641 mm; the side elevation of the first tail section above the steel-outlet channel notch is an inclined surface, and the angle B between the inclined surface and the horizontal plane is 103°.

[0017] The refractory material of the induction coil protection part in the electromagnetic stirring is aluminum-magnesium or MgO+Al2O3≥70% or MgO+SiO2≥70%.

[0018] The technical solution of the utility model has achieved the following beneficial technical effects: the electromagnetic stirring tundish induction coil protection part of the utility model has a reasonable structure and is easy to process and produce, and can effectively protect the induction coil. At the same time, its own external structure is used to improve the flow field of molten steel in the tundish, to make the composition and temperature of molten steel uniform, to promote the floating of inclusions, and to reduce the scouring of molten steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the main structure of the pouring area protection plate of the electromagnetic stirring device including the induction coil protection member of the utility model;

[0020] Figure 2 for Figure 1 The schematic diagram of the top view of the structure of the pouring area protection plate of the electromagnetic stirring device of the utility model is shown;

[0021] Figure 3 for Figure 1The three-dimensional structural diagram of the pouring area protection plate of the electromagnetic stirring device of the utility model is shown;

[0022] Figure 4 This is a front view of the impact zone protection plate of the induction coil protection member of the electromagnetic stirring package of the utility model;

[0023] Figure 5 for Figure 4 The schematic diagram of the top view of the structure of the impact zone protection plate of the induction coil protection member in the electromagnetic stirring of the utility model is shown;

[0024] Figure 6 for Figure 4 The three-dimensional structural diagram of the pouring area protection plate of the electromagnetic stirring device of the utility model is shown;

[0025] Figure 7 for Figure 4 The three-dimensional structural diagram of the pouring area protection plate of the electromagnetic stirring device of the utility model from another angle;

[0026] Figure 8 Original three-dimensional spatial model of the watershed;

[0027] Fig. 9 Overall flow diagram;

[0028] Fig.10 Velocity vector diagram of symmetry surface;

[0029] Fig.11 Velocity vector diagram of the cross section where the stopper rod is located;

[0030] Fig.12 Liquid surface velocity cloud diagram;

[0031] Fig.13 RTD curves for each stream.

[0032] The reference numerals in the figure are as follows: 1-first head section; 2-first arc-shaped connecting section; 3-first tail section; 4-notch of the steel outlet channel; 5-inclined surface; 6-second head section; 7-second arc-shaped connecting section; 8-transition connecting section; 9-third arc-shaped connecting section; 10-second tail section; 11-inner side; 12-outer side; 13-installation groove. DETAILED DESCRIPTION

[0033] like Figures 1 to 7 As shown, the electromagnetic stirring induction coil protection member of this embodiment includes an impact zone protection plate and a pouring zone protection plate, and the electromagnetic stirring induction coil is located in a space enclosed by the impact zone protection plate and the pouring zone protection plate;

[0034] like Figures 1 to 3As shown, the casting area protection plate includes a first head section 1, a first arc-shaped connecting section 2 and a first tail section 3, the first arc-shaped connecting section 2 is located between the first head section 1 and the first tail section 3 and the two ends are respectively connected to the first head section 1 and the first tail section 3; the upper end surface length L1 of the first head section 1 is greater than 1500mm, the upper end surface length L2 of the first tail section 3 is greater than 700mm, the arc length L3 of the first arc-shaped connecting section 2 is greater than 130mm, the angle between the first head section 1 and the first tail section 3 is greater than 160°, and the thickness of the first head section 1, the first arc-shaped connecting section 2 and the first tail section 3 is 70-80mm. The length L1 of the upper end face of the first head section 1 is 1534 mm, the length L2 of the upper end face of the first tail section 3 is 702 mm, the arc length L3 of the first arc-shaped connecting section 2 is 131 mm, and the radius R1 of the arc where the first arc-shaped connecting section 2 is located is 500 mm, the angle A between the first head section 1 and the first tail section 3 is 165°, the thickness L6 of the first head section 1, the first arc-shaped connecting section 2 and the first tail section 3 is 80 mm; the overall height L7 of the pouring area protection plate is 1150 mm. The upper end faces of the first head section 1, the first arc-shaped connecting section 2 and the first tail section 3 are flush. The lower end face of the first head section 1, the lower end face of the first arc-shaped connecting section 2 and the lower end face of a section of the first tail section 3 adjacent to the first arc-shaped connecting section 2 are flush. The lower part of the first tail section 3 is provided with a steel outlet channel notch 4, the height L4 of the steel outlet channel notch 4 is 410 mm, and the width L5 is 383 mm; the side elevation of the first tail section 3 above the steel outlet channel notch 4 is an inclined surface 5, and the angle B between the inclined surface 5 and the horizontal plane is 100°.

[0035] like Figures 4 to 7 As shown, the impact zone protection plate includes a second head section 6, a second arcuate connecting section 7, a transition connecting section 8, a third arcuate connecting section 9 and a second tail section 10, the second arcuate connecting section 7 is located between the second head section 6 and the transition connecting section 8, and its two ends are respectively connected to the second head section 6 and the transition connecting section 8, the third arcuate connecting section 9 is located between the transition connecting section 8 and the second tail section 10, and its two ends are respectively connected to the transition connecting section 8 and the second tail section 10; the arc length of the second arcuate connecting section 7 is 132mm, and the arc length of the third arcuate connecting section 9 is 222mm; the length of the second head section 6 is 295-320mm, the length of the transition connecting section 8 is 295-354mm, and the length of the second tail section 10 is 1181-1186mm.

[0036] The side of the impact zone protection plate adjacent to the electromagnetic stirring induction coil is the inner side 11, and the side away from the electromagnetic stirring induction coil is the outer side 12; on the inner side 11: the length M1 of the second head section 6 is 295mm, the length M2 of the transition section 8 is 295mm, and the length M3 of the second tail section 10 is 1181mm; on the outer side 12: the length M4 of the second head section 6 is 320mm, the length M5 of the transition section 8 is 354mm, and the length M6 of the second tail section 10 is 1186mm. The angle C between the second head section 6 and the transition section 8 is 155°, the angle D between the transition section 8 and the second tail section 10 is 140°, and the angle E between the second head section 6 and the second tail section 10 is 115°. The thickness L6 of the impact zone protection plate is 105mm, and the overall height L7 is 1010mm. The radius R2 of the arc where the second arc-shaped connecting section 7 is located and the radius R3 of the arc where the third arc-shaped connecting section 9 is located are both 300mm. A mounting groove 13 is longitudinally provided on the upper edge of the outer plate surface of the second head section 6, and the groove depth of the mounting groove 13 is 55mm; the upper end surfaces of the second arc-shaped connecting section 7, the transition connecting section 8, the third arc-shaped connecting section 9 and the second tail section 10 are flush, and the upper end surface of the second head section 6 is 80mm lower than the upper end surface of the transition connecting section 8. The lower part of the second tail section 10 has a steel-outlet channel notch 4, and the height L4 of the steel-outlet channel notch 4 is 410mm and the width L5 is 641mm; the side elevation of the first tail section 3 above the steel-outlet channel notch 4 is an inclined surface 5, and the angle B between the inclined surface 5 and the horizontal plane is 103°.

[0037] The electromagnetic stirring ladle induction coil protection component of this embodiment has a reasonable structure and is easy to process and produce. It can effectively protect the induction coil. At the same time, it uses its own external structure to improve the flow field of molten steel in the ladle, make the molten steel composition and temperature uniform, promote the floating of inclusions, and reduce the scouring of molten steel.

[0038] The flow field simulation test of the middle package of the induction coil protection member in this embodiment is carried out. The specific test parameters are shown in Table 1 below:

[0039] Table 1 Parameters required for the test

[0040] name parameter Billet size 280mm×380mm Pulling speed 0.62m / min~0.85m / min Inner and outer diameter of shroud 75mm / 135mm Working fluid level 700mm~850mm Long shroud insertion depth 200mm~300mm

[0041] 2. Simulation Analysis

[0042] 2.1 CAD digital object modeling

[0043] 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 8 As shown:

[0044] 2.2 CAE Digital Object Modeling

[0045] The test object is divided into tetrahedral grids, and the number of grids is about 750,000.

[0046] 2.3 CAE Model

[0047] 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.

[0048] 2.4 Boundary Conditions

[0049] According to the working conditions of the test object in service, the boundary conditions are set. For details, please see the table below:

[0050] Table 2 Boundary conditions

[0051] 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

[0052] 3. Results of Flow Field of Liquid Steel in Tundish

[0053] 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:

[0054] 3.1. The overall streamline diagram is as follows Fig. 9 shown.

[0055] 3.2. The velocity vector diagram of the symmetry surface is shown in Fig.10 shown.

[0056] 3.3、The velocity vector diagram of the cross section where the stopper rod is located is as follows Fig.11 shown.

[0057] 3.4、Liquid surface velocity cloud diagram Fig.12 shown.

[0058] 4. Experimental Results Analysis

[0059] 4.1、RTD curve analysis Fig.13 The RTD curve analysis results are shown in Table 3.

[0060] Table 3 RTD curve analysis results

[0061]

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

[0063] Table 4 Calculation results of inclusion removal rate

[0064]

[0065] The electromagnetic stirring tundish induction coil protection member of this embodiment further optimizes the tundish flow field when used together with the guide tube 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 dead zone volume are almost the same.

[0066] 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. An electromagnetic stirring induction coil protection member, characterized in that: It comprises an impact zone protection plate and a pouring zone protection plate, wherein the induction coil of the electromagnetic stirring package is located in a space enclosed by the impact zone protection plate and the pouring zone protection plate; The pouring area protection plate comprises a first head section (1), a first arc-shaped connecting section (2) and a first tail section (3); the first arc-shaped connecting section (2) is located between the first head section (1) and the first tail section (3) and its two ends are respectively connected to the first head section (1) and the first tail section (3); the length L1 of the upper end surface of the first head section (1) is greater than 1500 mm, the length L2 of the upper end surface of the first tail section (3) is greater than 700 mm, the arc length L3 of the first arc-shaped connecting section (2) is greater than 130 mm, the angle A between the first head section (1) and the first tail section (3) is greater than 160°, and the thickness of the first head section (1), the first arc-shaped connecting section (2) and the first tail section (3) is 70-80 mm; The impact zone protection plate comprises a second head section (6), a second arc-shaped connecting section (7), a transition connecting section (8), a third arc-shaped connecting section (9) and a second tail section (10); the second arc-shaped connecting section (7) is located between the second head section (6) and the transition connecting section (8), and its two ends are respectively connected to the second head section (6) and the transition connecting section (8); the third arc-shaped connecting section (9) is located between the transition connecting section (8) and the second tail section (10), and its two ends are respectively connected to the transition connecting section (8) and the second tail section (10); the arc length of the second arc-shaped connecting section (7) is 130-135 mm, and the arc length of the third arc-shaped connecting section (9) is 220-225 mm; the length of the second head section (6) is 295-320 mm, the length of the transition connecting section (8) is 295-354 mm, and the length of the second tail section (10) is 1181-1186 mm.

2. The electromagnetic stirring induction coil protection member according to claim 1, characterized in that: The length L1 of the upper end surface of the first head section (1) is 1534 mm, the length L2 of the upper end surface of the first tail section (3) is 702 mm, the arc length L3 of the first arc-shaped connecting section (2) is 131 mm, and the radius R1 of the arc where the first arc-shaped connecting section (2) is located is 500 mm, the angle A between the first head section (1) and the first tail section (3) is 165°, and the thickness L6 of the first head section (1), the first arc-shaped connecting section (2) and the first tail section (3) is 80 mm; the overall height L7 of the casting area protection plate is 1150 mm.

3. The electromagnetic stirring induction coil protection member according to claim 1, characterized in that: The upper end surfaces of the first head section (1), the first arc-shaped connecting section (2) and the first tail section (3) are flush.

4. The electromagnetic stirring induction coil protection member according to claim 3, characterized in that: The lower end surface of the first head section (1), the lower end surface of the first arc-shaped connecting section (2) and the lower end surface of a section of the first tail section (3) adjacent to the first arc-shaped connecting section (2) are flush.

5. The electromagnetic stirring induction coil protection member according to claim 4, characterized in that: The lower part of the first tail section (3) is provided with a steel outlet channel notch (4), the height L4 of the steel outlet channel notch (4) is 410 mm, and the width L5 is 383 mm; the side elevation of the first tail section (3) above the steel outlet channel notch (4) is an inclined surface (5), and the angle B between the inclined surface (5) and the horizontal plane is 100°.

6. The electromagnetic stirring induction coil protection member according to claim 1, characterized in that: The side of the impact zone protection plate adjacent to the electromagnetic stirring induction coil is the inner side (11), and the side away from the electromagnetic stirring induction coil is the outer side (12); on the inner side (11): the length M1 of the second head section (6) is 295 mm, the length M2 of the transition section (8) is 295 mm, and the length M3 of the second tail section (10) is 1181 mm; on the outer side (12): the length M4 of the second head section (6) is 320 mm, the length M5 of the transition section (8) is 354 mm, and the length M6 of the second tail section (10) is 1186 mm.

7. The electromagnetic stirring induction coil protection member according to claim 1, characterized in that: The included angle C between the second head section (6) and the transition section (8) is 155°, the included angle D between the transition section (8) and the second tail section (10) is 140°, and the included angle E between the second head section (6) and the second tail section (10) is 115°.

8. The electromagnetic stirring induction coil protection member according to claim 1, characterized in that: The thickness L6 of the impact zone protection plate is 105 mm, the overall height L7 is 1010 mm, and the radius R2 of the arc where the second arc-shaped connecting section (7) is located and the radius R3 of the arc where the third arc-shaped connecting section (9) is located are both 300 mm.

9. The electromagnetic stirring induction coil protection member according to claim 1, characterized in that: A mounting groove (13) is provided in the longitudinal direction on the outer plate surface of the second head section (6), and the groove depth of the mounting groove (13) is 55 mm; the upper end surfaces of the second arc-shaped connecting section (7), the transition connecting section (8), the third arc-shaped connecting section (9) and the second tail section (10) are flush, and the upper end surface of the second head section (6) is 80 mm lower than the upper end surface of the transition connecting section (8).

10. The electromagnetic stirring induction coil protection member according to claim 1, characterized in that: The lower part of the second tail section (10) is provided with a steel outlet channel notch (4), the height L4 of the steel outlet channel notch (4) is 410 mm, and the width L5 is 641 mm; the side elevation surface of the first tail section (3) above the steel outlet channel notch (4) is an inclined surface (5), and the angle B between the inclined surface (5) and the horizontal plane is 103°.

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