電磁シールド方式による高周波誘導炉内の溶鉄の攪拌制御

概要

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Flow control of liquid iron in a high-frequency induction furnace was carried out by using the magnetic shield for the frequency range from 30kHz to 200kHz. Several types of graphite shield with different resistivities (ρ_<eff>) were used for the experiments. Magnetic flux densities (B_z) 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 B_z near the shield and the value of W changed widely with ρ_<eff> and frequency (ƒ). And then the experiment on the dissolution of graphite rod in liquid iron was made at 1673 K to obtain the local and average mass-transfer coefficients (k_<Lz> and k_L) which depend on the flow intensity. It was found that the values of k_<Lz> and k_L varied widely with ρ_<eff> as well as ƒ. The mutual inductance model was used for the analysis on the electromagnetic field in the furnace. Calculated values of B_z 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 k_<Lz> were consistent with the observed ones.
社団法人日本鉄鋼協会の論文
1992-05-01