Three-phase-equilibrium electroslag refining furnace

Abstract

The invention discloses a three-phase-equilibrium electroslag refining furnace which comprises a modular-multilevel-based correction device, a normal electroslag furnace, a three-phase power supply and a transformer, wherein the modular-multilevel-based correction device is connected with the three-phase power supply through a three-phase incoming line; two phases of the three-phase power supply are connected with the normal electroslag furnace through the transformer; the modular-multilevel-based correction device is of a three-phase half-bridge topological structure; and each bridge arm in the three-phase half-bridge topological structure is characterized in that two converter sub-modules are serially connected and then are connected with one phase of the three-phase power supply through an electric reactor. The three-phase-equilibrium electroslag refining furnace disclosed by the invention solves the problem of three-phase nonequilibrium of the power grid caused by the single-phase electroslag furnace, and improves power factor of the load, reduces a series of influences caused by the problem of grid nonequilibrium, and saves investment cost of steel-making enterprise; and meanwhile, the electroslag refining furnace achieves the purpose of energy conservation and emission reduction, improves utilization rate of electric energy and reduces pollution on the power grid.

Description

technical field [0001] The invention relates to a three-phase equilibrium electroslag remelting furnace used for smelting metals and alloys thereof in steelmaking enterprises. Background technique [0002] At present, the electroslag furnaces used by steelmaking enterprises are basically single-phase electroslag furnaces, including two types: unipolar and bipolar. During the remelting process of the electroslag furnace, as the melting progresses, the electrodes continue to shorten and the steel ingot gradually rises, which leads to changes in the resistance of the electrodes and the resistance of the steel ingot, which leads to voltage and current fluctuations. [0003] At the same time, when an enterprise uses a single-phase electroslag furnace to make steel, it basically selects two phases of the three phases A, B, and C of the power grid to connect to the electroslag furnace through a transformer. Possibly a three-phase imbalance. In order to solve the problem of unbala...

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The present invention provides a three-phase balanced electroslag remelting furnace, the purpose of which is to integrate the ordinary electroslag furnace and the deviation correction device based on modular multi-level to solve the problem of three-phase imbalance and increase the load The power factor is lower, the production cost of the enterprise is reduced, and the purpose of energy saving and emission reduction is achieved

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