To improve the efficiency and reduce the energy consumption of an electromagnetic induction heater for steel ingot riser, an optimization method for the yoke is proposed. Using ANSYS multi-physics coupling simulation, the effects of the yoke on the magnetic field distribution, heating efficiency, and solidification of the steel ingot riser were analyzed. The results show that when the yoke is expanded to 130% of the coil area and its thickness is increased to 120 mm, magnetic flux leakage at the edges is suppressed under the same working conditions. This increases the magnetic flux density on the molten steel surface by approximately 80% and increases the Joule heating power by about 2.5 times. Meanwhile, the temperature distribution in the riser region becomes more uniform, solidification of the ingot is delayed, and the feeding channel duration at the riser line is extended by 18 min. Under the same excitation current of 692 A, this optimized design increases the heating power from 10.67 kW before optimization to 26.58 kW, achieving an efficient heating mode of "low current, high power" while reducing coil losses.
Patil P , Puranik A , Balachandran G , et al . FEM simulation of effect of mould wall thickness on low alloy steel ingot solidification [J]. Ironmaking & Steelmaking , 2016 , 43 ( 8 ): 621 - 627 .
Khalajzadeh V , Beckermann C . Simulation of shrinkage porosity formation during alloy solidification [J]. Metallurgical and Materials Transactions A , 2020 , 51 ( 5 ): 2239 - 2254 .
Tavakoli M H , Karbaschi H , Samavat F . Influence of workpiece height on the induction heating process [J]. Mathematical and Computer Modelling , 2011 , 54 ( 1-2 ): 50 - 58 .
Sun J L , Li S , Qiu C W , et al . Numerical and experimental investigation of induction heating process of heavy cylinder [J]. Applied Thermal Engineering , 2018 , 134 : 341 - 352 .
Liu N N , Xu C J , Lv Y , et al . Effect of electromagnetic induction coil position on feeding effect in steel ingot [J]. AIP Advances , 2022 , 12 ( 4 ): 045212 .