Automatic tundish liquid level control method and system

Abstract

The invention discloses an automatic tundish liquid level control method and system. The system comprises an automatic tundish liquid level control device, and the automatic tundish liquid level control device comprises a PLC controller, a display, a central control unit, a control box, a large ladle, a tundish, a long water pipe, a large ladle slide plate, a crystallizer and a casting blank. A bottom liquid outlet of the large ladle is provided with a large ladle slide plate and connected with the tundish through the long water pipe, the casting blank is arranged in the crystallizer which isconnected to the bottom of the tundish, and a weight sensor is arranged in the tundish. Liquid steel injecting speed is controlled by the PLC controller and the central control unit through the weightsensor for informing, so that the liquid steel content of the tundish is controlled in a preset weight range with a preset weight value as a reference value; liquid steel purity is improved, metal yield is increased, tundish weight is stably controlled, and influences of tundish liquid level fluctuation on casting blank quality are reduced.

Description

technical field [0001] The invention relates to a method and system for automatically controlling the liquid level of a tundish. Background technique [0002] In the production process of continuous casting, as the molten steel level drops in the later stage of casting, due to the action of the earth's deflection force (Coriolis force), a confluence vortex will be generated at the steel-slag interface in the ladle, and the vortex will easily cause slag entrainment. When the height of molten steel is lower than the critical height of the vortex, the vortex is even involved in gas, the concave vortex becomes more and more obvious, and the swirling velocity becomes larger and larger until it passes through the nozzle. The height of the liquid level at this time is called the penetration height, resulting in a large Slag enters the nozzle, which is very unfavorable to the production of clean steel. The ladle vortex slag brings great harm: (1) deteriorates the castability of mol...

AI Technical Summary

Problems solved by technology

[0002] In the production process of continuous casting, as the molten steel level drops in the later stage of casting, due to the action of the earth's deflection force (Coriolis force), a confluence vortex will be generated at the steel-slag interface in the ladle, and the vortex will easily cause slag entrainment. When the height of molten steel is lower than the critical height of the vortex, the vortex is even involved in gas, the concave vortex becomes more and more obvious, and the swirling velocity becomes larger and larger until it passes through the nozzle. The height of the liquid level at this time is called the penetration height, resulting in a large The slag enters the nozzle, which is very unfavorable to the production of clean steel

The ladle vortex slag brings great harm: (1) deteriorates the castability of molten steel, blocks the nozzle, and the casting cannot be carried out normally; (2) causes the oxidation of alloy elements in molten steel, and produces inclusions that affect the purity of molten steel; (3) The content of dissolved aluminum in the slab decreases, and the tundish and shroud are severely corroded; (4) The large slag enters the tundish, resulting in the accumulation of molten slag in the tundish, which has adverse effects on the continuous casting process

[0003] In conventional production, a slag detection device is usually installed near the nozzle at the bottom of the ladle. When the amount of slag entering the molten steel flow accounts for a certain proportion, the sliding nozzle is closed in advance to reduce the amount of slag, but it will cause excessive residue in the ladle. More molten steel, which in turn leads to lower metal yield

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