Influence of Magnetic Shielding on the Power Loss of Induction Heating Power Supply in the Electromagnetic Induction Controlled Automated Steel Teeming System
Ming HE^{1,}^{2}, Xianliang LI^{1,}^{3}, Qingwei WANG^{1,}^{2}, Lianyu WANG^{1,}^{2}, Qiang WANG^{1}()
1 Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education),Northeastern University, Shenyang 110819, China 2 School of Metallurgy, Northeastern University, Shenyang 110819, China 3 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
In order to reduce the influence of ladle structure on the power loss of power supply in the electromagnetic induction controlled automated steel teeming (EICAST) system, a method of setting magnetic shielding material on the bottom and sides of induction coil is firstly proposed. The influence of the magnetic shielding on the magnetic flux density and the optimal heating position of induction coil are analyzed by numerical simulation, and the correctness of simulation results is verified by laboratory experiments. In addition, the best magnetic shielding sizes and structure for this new technology are determined respectively. The results show that the magnetic shielding method can effectively reduce the power loss of induction coil and improve the optimum heating area of induction coil. When using copper as a magnetic shielding material, the best sizes of magnetic shielding are height of 200 mm, length of 290 mm, width of 290 mm and thickness of 1 mm. At this time, the best heating position of induction coil will move upward, and the moving distance is 20.2 mm, which is beneficial to the installation of induction coil and the improvement of its service life. To improve the strength of nozzle brick and ensure the service life of nozzle brick, a new structure is applied, and its magnetic shielding effect is almost the same as the former. These research works are very important for the wide application of the EICAST technology.
Ming HE, Xianliang LI, Qingwei WANG, Lianyu WANG, Qiang WANG. Influence of Magnetic Shielding on the Power Loss of Induction Heating Power Supply in the Electromagnetic Induction Controlled Automated Steel Teeming System. Acta Metall Sin, 2019, 55(2): 249257.
Fig.1 Numerical model of the calculation for magnetic shielding effect (h, l, w and t indicate the height, length, width and thickness of magnetic shielding material, respectively)
Parameter
Value
Unit
Ampereturns of induction coil
2160, 3600
AN
Height of induction coil
170
mm
Inner diameter of induction coil
235
mm
Length and width of bottom magnetic shielding material
550, 350
mm
Thickness of bottom magnetic shielding material
2
mm
Height of four sides magnetic shielding material
0, 50, 100, 150, 200, 250, 300
mm
Length of four sides magnetic shielding material
290, 310, 330, 350
mm
Width of four sides magnetic shielding material
290, 310, 330, 350
mm
Thickness of four sides magnetic shielding material
0.5, 1, 2, 3
mm
Relative permittivity of copper
1

Relative permeability of copper
0.999991

Bulk conductivity of copper
58000000
S/m
Relative permittivity of steel
1

Relative permeability of steel
4000

Bulk conductivity of steel
10300000
S/m
Table 1 Main model and electromagnetic parameters during the calculation process
Fig.2 Experimental device of magnetic shielding effect test (1—induction coil, 2—upper nozzle, 3—cooling air, 4—collecting device, 5—nozzle brick, 6—Tesla meter, 7—magnetic shielding material, 8—experimental platform, 9—induction heating power supply)
Fig.3 Comparisons between numerical simulation results and experimental results of magnetic flux density (B) at different positions on the center line of nozzle without magnetic shielding material
Fig.4 Distributions of B in plane A without (a) and with (b) bottom magnetic shielding material
Fig.5 Distributions of B at center line of induction coil with or without bottom magnetic shielding material
Fig.6 Distributions of B in plane A (a, c) and plane B (b, d) without (a, b) or with (c, d) sides magnetic shielding materials
Fig.7 Distributions of B in plane A with sides magnetic shielding material heights of 0 mm (a), 50 mm (b), 100 mm (c), 150 mm (d), 200 mm (e) and 250 mm (f)
Fig.8 Changes of B at center line of induction coil with different magnetic shielding material heights
Fig.9 Changes of B at center line of induction coil with different sides magnetic shielding material widths (l=350 mm, h=200 mm, t=2 mm) (a) and lengths (w=290 mm, h=200 mm, t=2 mm) (b)
Fig.10 Changes of B at center line of induction coil with different magnetic shielding material thicknesses
Fig.11 Distributions of B at center line of induction coil with or without bottom and sides magnetic shielding materials
Fig.12 Distributions of B in plane A with different magnetic shielding structures (l=290 mm, w=290 mm, h=200 mm, t=1 mm) (a) traditional structure (b) new structure
Fig.13 Distributions of B at center line with different magnetic shielding structures
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