Continuous casting tundish direct-current plasma heating device using a plurality of graphite hollow bars as electrodes

Abstract

The invention provides a continuous casting tundish molten steel direct-current plasma heating method and device using a plurality of graphite hollow electrodes, which are suitable for heating systems in industrial production. A hollow graphite electrode plasma heating technology can be used for a molten iron pretreatment, ladle refining and continuous casting tundish plasma heating device. The method and the device can reasonably control the temperature of molten steel in a tundish, compensate temperature fluctuation and stabilize casting operation, so that the production rate of a continuous casting machine is greatly increased. By mounting the heating device for compensating the heat of the molten steel in the tundish, the temperature of the molten steel of the tundish can be greatly lowered, constant low-temperature casting is realized, non-metal inclusions and central segregation in continuous casting blanks can be reduced, submerged nozzle blockage is prevented, the quality of the casting blanks is improved, the yield rate is improved, and casting operation is stable. By heating the molten steel of the tundish, the tapping temperature of a steel smelting furnace can be lowered, and the refractory and energy fees of a steel smelting technology can be reduced. The hollow graphite electrode plasma heating technology plays an important role in helping China metallurgical industry take a quality-benefit road.

Description

technical field [0001] The invention belongs to the field of science and technology and industrial technology, and in particular relates to a continuous casting tundish DC plasma heating device and method using multi-graphite hollow rods as electrodes. Background technique [0002] Plasma is composed of a large number of free electrons and ions and a small amount of unionized gas molecules and atoms. Reaching a certain degree of ionization (>10-4), the gas is in a conductive state. Since the overall behavior of the ionized gas shows electrical neutrality, that is, the number of positive and negative charges in the ionized gas is equal, this gas state is called a plasma state. Plasma heating technology is to apply a certain amount of electric energy on the plasma generator to generate arc light to fully ionize the gas medium, so that the plasma energy is highly concentrated for heating. According to the temperature, it can be divided into high temperature plasma and low t...

AI Technical Summary

Problems solved by technology

[0005] The plasma gun body is divided into metal plasma gun and non-metal plasma gun according to the material. In order to keep the gun body working normally, the metal plasma gun needs to cool down the plasma gun body with water. The water cooling system will take away part of the heat. It must enter the tundish for heating, so the plasma gun body is not allowed to leak water. Once the water leaks, it will explode with the high-temperature molten steel. Therefore, metal plasma guns generally have the disadvantages of complex structure, short service life, and high cost.

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