Optimizing Design of Vortex Suppression Utilizing Static Electromagnetic Field during Steel Teeming from Ladle

Abstract

Vortex slag entrapment during ladle teeming process causes liquid steel pollution, nozzle clogging, etc. Tangential velocity of molten steel is directly related to the vortex. Herein, the tangential velocity is reduced by the electromagnetic force generated by the interaction between a static electromagnetic field and the molten steel. Through the multiphysical field simulation, influences of the electromagnetic parameter, coil structure, coil position, and ladle structure on the vortex are investigated. Results demonstrate that magnetic induction intensity is proportional to the coil ampere‐turns, thereby affecting the vortex suppression. The action region of the static electromagnetic field expands when the coil diameter increases from 180 to 360 mm; it is beneficial to reduce the vortex critical height by 37.9%. The reduction of the distance between the coil and the molten steel also promotes the vortex suppression. The coil misalignment is beneficial to fully utilize the electromagnetic field; the critical height is reduced by 15%. The tangential velocity is changed when the nozzle diameter and eccentricity are optimized, and the vortex suppression will be amplified by using the electromagnetic field. This study provides the theoretical guidance for the optimizing design of the vortex suppression utilizing the static electromagnetic field.

Suppression and Control of Vortex Formation Caused by Boundary Disturbance during Ladle Teeming Process

“…[ 43 ] He reduced the tangential velocity at the bottom of the ladle using a static magnetic field, which markedly suppressed vortex formation. [ 44 ] Mulligan observed an unstable state of vortices under disturbances caused by a rotating wall. [ 45 ] An experimental investigation involving cylindrical containers with independently rotating top, bottom, and side walls revealed a discernible correlation between the genesis and dissipation of vortices and the initial tangential velocity.…”