In order to optimize the tundish induction heating system, the influence of channel abduction angle on the distribution of electromagnetic field was studied. A three-dimensional electromagnetic field mathematical model was established to simulate the distribution characteristics of magnetic induction intensity, induced current density and Joule heat when the channel abduction angle changes in the range of 2° to 10°, taking a two-strand tundish with large nozzle spacing (5 550 mm) in a steel plant as the object. The calculation results show that under the same heating power, as the abduction angle increases, the geometric position of the channel shifts relative to the coil, resulting in a downward trend in magnetic induction intensity, current density and Joule heat, and this attenuation is most significant in the channel outlet area, indicating that the magnetic field energy loss is mainly concentrated in the second half of the channel. The magnetic field shows a stable eccentric distribution on the central section of the channel, and the electromagnetic parameters near the coil side are higher. Through comprehensive analysis, it is determined that the 2° abduction angle is the best design parameter. At this angle, the magnetic induction intensity at the near coil side can reach 0.188 T, and the overall induced current density is higher than 1.70×10⁶ A/m². Therefore, in practical engineering design, it is recommended to use 2° or adjacent small outreach angles to maximize electromagnetic coupling efficiency and improve heating performance.
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