Rotating electromagnetic field and tangential flow guiding composite purifying tundish steel liquid method and device

Abstract

The invention relates to a method for purifying liquid steel in tundish by the composition of a rotary electromagnetic field and a tangential diversion and a device. The method is that the generating device of the rotary magnetic field generates the rotary electromagnetic force to drive steel water in a tundish rotary chamber to generate the rotary flow, which is characterized in that the vertical impact flow of a ladle nozzle is guided to horizontal tangential to flow into the rotary chamber to form the power of the rotary flow, then the power of the rotary flow is composed with the rotary electromagnetic force to allow the steel water in the rotary chamber to generate the symmetric rotary flow, and the centrifugal force is utilized to separate the non-metallic impurities from the steel water. The device is the tundish which contains the rotary chamber, which is characterized in that the rotary chamber is connected with a guide slot along the tangent, the ladle nozzle is arranged in the guide slot, and the outside of the rotary chamber is provided with a generating device of the fan-shaped rotary magnetic field. The invention adopts the composition of the rotary electromagnetic field and the tangential guide flow, thus enhancing the rotation intensity of the steel water, reducing the input power and the energy consumption of the generating device of the rotary magnetic field, eliminating the damage function of the ladle injection flow on the centrifugal separation of inclusions and improving the purification effect.

Description

technical field [0001] The present invention relates to a new method for compound purification of molten steel in continuous casting tundish by using rotating electromagnetic field and tangential flow guide, that is, using electromagnetic field to drive the rotation of molten steel in the ladle nozzle area of ​​the tundish, and at the same time displacing the ladle nozzle impact area On the side of the tundish, the impact kinetic energy of the ladle nozzle is converted into a horizontal tangential impact flow, and the compound rotating magnetic field drives the molten steel to rotate. Using the difference in density between the inclusions and the molten steel, the inclusions migrate centripetally, and then collide, aggregate, grow and float quickly remove. The invention belongs to the technical field of pure steel continuous casting. Background technique [0002] With the introduction of the concept of "tundish metallurgy" in the early 1980s, the tundish has developed from ...

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Problems solved by technology

[0004] However, in the centrifugal tundish technology, the rotation of molten steel is provided by the electromagnetic field, which requires high power consumption; in addition, when the ladle nozzle is located at the center of rotation, the impact flow of the ladle nozzle will form downward, then upward, and then to The complex flow in the vertical direction will redisperse the centripetally gathered inclusions, so that the removal effect of inclusions will be significantly reduced, and even the purification effect will not be achieved.

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