A Composite Coil Mold Electromagnetic Stirrer

Abstract

The invention provides an electromagnetic stirrer of a combined type coil crystallizer. The electromagnetic stirrer comprises an annular yoke and a plurality of magnetic field generating devices, wherein each magnetic field generating device comprises a traveling wave magnetic field generating part and a rotating magnetic field generating part, the annular yoke is positioned outside the crystallizer, a certain interval is formed between the annular yoke and the crystallizer, and the traveling wave magnetic field generating parts and the rotating magnetic field generating parts are installed onan inner wall of the annular yoke in a circumferential shape; each traveling wave magnetic field generating part comprises a vertical edge of each C-shaped iron core and a traveling wave magnetic field coil, the traveling wave magnetic field coils wind around the vertical edges of the C-shaped iron cores in a direction perpendicular to the flowing direction of molten steel, and certain intervalsexist among the coils; and each rotating magnetic field generating part comprises two horizontal edges of each C-shaped iron core and a rotating magnetic field coil, and the rotating magnetic field coils wind around two horizontal edges of the C-shaped iron cores in a flowing direction parallel to the flowing direction of the molten steel in the continuous casting crystallizer. According to the electromagnetic stirrer, by utilizing the stacking of a rotating magnetic field and a traveling wave magnetic field, the defects caused by inclusions and the like in the casting blank production processare improved, and the quality of a steel billet is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel continuous casting equipment, and in particular relates to an electromagnetic stirrer for a composite coil crystallizer. Background technique [0002] With the rapid development of modern industry, various industries have higher and higher requirements for steel quality. Therefore, electromagnetic stirring technology is widely used in continuous casting production. At present, electromagnetic stirrer has become a high-efficiency continuous casting, and it is necessary to obtain high-quality casting slabs. few links. [0003] The essence of electromagnetic stirring is to strengthen the movement of molten steel in the liquid phase cavity by means of the electromagnetic force induced by the electromagnetic field in the liquid phase cavity, thereby strengthening the convection, heat transfer and mass transfer process of the molten steel, resulting in inhibiting the development of columnar cryst...

AI Technical Summary

Problems solved by technology

In the process of continuous casting of blooms, it is easy to generate flow dead zones at the corners of the billet, causing defects in the casting slab, and the excessive flow rate of the submerged nozzle will impact the initial solidification shell of the slab, and also hinder non-metallic inclusions Floating, seriously affecting the quality of the slab

[0005] At present, most of the mold electromagnetic stirrers in industrial continuous casting production are conventional electromagnetic stirrers. The rotating magnetic field generated by them can stir the molten steel horizontally, so that the temperature distribution of the molten steel in the mold can be more uniform, and the equiaxed crystal ratio can be increased. The rotating magnetic field has little effect on the floating of inclusions in the molten steel in the mold, and the direction of the traveling wave magnetic field is opposite to that of the submerged nozzle jet, which can strengthen the longitudinal flow of the molten steel in the mold and reduce the speed of the submerged nozzle jet

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