Bottom-argon-blowing LF furnace and auxiliary argon blowing apparatus thereof, and auxiliary argon blowing method

Abstract

The invention relates to an auxiliary argon blowing apparatus based on bottom argon blowing of a LF furnace, an argon blowing method of the auxiliary argon blowing apparatus, and a bottom-argon-blowing LF furnace equipped with the auxiliary argon blowing apparatus. The auxiliary argon blowing apparatus based on bottom argon blowing of the LF furnace comprises an argon blowing gun used for argon blowing into the furnace, wherein the argon blowing gun is connected with an argon supply pipeline and a driving mechanism used for driving switching of the argon blowing gun between an out-of-furnace standby station and an in-furnace working station; and the argon supply pipeline is provided with a flow control unit. The auxiliary argon blowing apparatus provided by the invention can realize timelyauxiliary argon blowing into the LF furnace in the case of insufficient or failed bottom argon blowing of the LF furnace, thereby guaranteeing smooth implementation of production, preventing influence on the service life of ladles due to excess increase of bottom-blowing argon flow and avoiding ladle-to-ladle operation or molten steel degradation.

Description

technical field [0001] The invention relates to an auxiliary argon blowing device based on argon blowing at the bottom of an LF furnace, an argon blowing method of the auxiliary argon blowing device, and a bottom blowing argon LF furnace equipped with the auxiliary argon blowing device. Background technique [0002] At present, most of the LF refining methods at home and abroad use argon blowing technology at the bottom of the ladle to stir the molten steel to achieve uniform temperature and composition, removal of inclusions, desulfurization and degassing. It is necessary to install breathable bricks at the bottom of the ladle to achieve argon blowing at the bottom. the goal of. However, the permeable bricks must withstand the continuous impact of high-temperature molten steel and the erosion of slag during use, and at the same time, they must also withstand the thermal shock of alternating hot and cold temperatures; often, the surface of the permeable bricks has poor air p...

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Problems solved by technology

[0003] If the bottom blowing pressure is increased, it is necessary to measure the molten steel composition multiple times and prolong the refining time, which will not only damage the permeable brick, increase the risk of steel breakout, affect the service life of the ladle, but also consume a lot of electric energy and alloys; if the molten steel composition is still not If the requirements are met, the steel needs to be downgraded, resulting in a large cost loss;

[0004] If the ladle process is carried out, it will not only affect the production rhythm on site, but also reduce the temperature of the molten steel during the ladle process; at the same time, there will be molten steel splashing, which will increase the loss of molten steel, thereby reducing production efficiency and increasing production costs

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