Electromagnetic Control Method of Mold Flow Field Used in Slab Continuous Casting Production

Abstract

The invention discloses a crystallizer flow field electromagnetic control method for slab continuous casting production. A crystallizer flow field is controlled by adopting a plurality of electromagnetic stirrers. The electromagnetic stirrers are traveling wave magnetic field generators. The electromagnetic stirrers are separately arranged in the upper region of a wide surface (9) of the crystallizer and in the lower region of a narrow surface (3) of the crystallizer; the upper electromagnetic stirrers (4) are mounted between the upper portion of the upper edge of the outlet of a water gap (2)and a meniscus surface (1) and the lower electromagnetic stirrers (7) are mounted below a spit stream spitted from a side hole of the water gap and an impact point of the narrow surface. The upper and lower electromagnetic stirrers are separately powered by a power supply, and control the current intensity independently. The upper edges of iron cores of the lower electromagnetic stirrers are located in the same height with the intersection of a straight line (6) drawn by taking the upper edge of the outlet of the water gap as the starting point and the angle of the outlet of the water gap asthe angle and the narrow surface of the crystallizer, and the stirring direction of a stirring coil is from bottom to top and is opposite to the direction of the stream (5) of a lower ring current along the narrow edge for weakening the impact depth of the stream of the lower ring current.

Description

technical field [0001] The invention relates to a crystallizer control technology for slab continuous casting production, in particular to an electromagnetic control method for mold flow field used in slab continuous casting production. Background technique [0002] During the slab continuous casting process, the molten steel enters the continuous casting mold through the submerged nozzle, and the molten steel stream flows in two directions respectively up and down after hitting the narrow surface of the mold, thus forming two circulations in the mold. The upper circulation dominates the flow of molten steel near the meniscus of the mold, affecting the melting, spreading and entrainment of mold slag; the impact depth of the lower circulation controls the floating separation of inclusions and bubbles. Therefore, the flow of molten steel in the mold must be controlled from the following two aspects: (1) The meniscus must be stabilized, the reverse flow rising along the solidif...

AI Technical Summary

Problems solved by technology

Place the electromagnetic stirrer under the nozzle of the mold, and the electromagnetic force along the horizontal direction of the mold interacts with the obliquely downward stream spit out from the side hole of the nozzle. The impact depth of the spout stream is quite limited, and it cannot effectively improve the floating conditions of non-metallic inclusions and bubbles in the crystallizer

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