1992 Volume 78 Issue 5 Pages 753-760
Flow control of liquid iron in a high-frequency induction furnace was carried out by using the magnetic shield for the frequency range from 30 kHz to 200 kHz. Several types of graphite shield with different resistivities (ρeff) were used for the experiments. Magnetic flux densities (Bz) were measured along the axis of the induction coil (90 mm ID, 140 mm height, 15 turns), and also the Joule's heats ( W) generated in the shields were measured. It was found that the degree of suppression of Bz near the shield and the value of W changed widely with ρeff and frequency (f). And then the experiment on the dissolution of graphite rod in liquid iron was made at 1 673 K to obtain the local and average mass-transfer coefficients (κLz and κL) which depend on the flow intensity. It was found that the values of κLz and κL varied widely with ρeff as well as f.
The mutual inductance model was used for the analysis on the electromagnetic field in the furnace. Calculated values of Bz and W were in good agreement with the observed ones. The Navier-Stokes' equation and the conservation equation of carbon in liquid iron were solved numerically under laminar flow condition. Calculated values of κLz were consistent with the observed ones.
