Method for cooling and secondary blowing-in of converter

Abstract

The invention relates to a method for cooling and secondary blowing-in of a converter. The method comprises blowing-out of the converter, blowing-out of the converter for maintenance, converter dryingand blowing-in processing for secondary blowing-in of the converter, and smelting processing after secondary blowing-in of the converter. According to the invention, during blowing-out of the converter, no brick in a converter lining is exposed; no slag in the blown-out converter is subjected to slagging; the converter is naturally cooled at a room temperature, so converter lining bricks are slowly cooled; during cooling of the converter, water is prohibited from leaking into the converter; when the converter is shut down, a tap hole cannot be exchanged; and after the converter is shut down,different damaged parts of the converter lining are repaired by adopting different repair materials and repair manners. With the method provided by the invention, under the situation that the converter with a magnesia carbon brick lining has shut down for 72 hours or more or the temperature of the converter drops to an environment temperature, the converter lining bricks are not removed or re-built, and the converter is started again through secondary drying of the converter. Thus, under the premises of guaranteeing safe production and meeting process demands, the refractory material cost of the converter in a steelmaking plant is reduced; production capacity can be dynamically adjusted at any time; and the converter in the steelmaking plant can be started and shut down at any time according to market situations.

Description

technical field [0001] The invention relates to the field of converter steelmaking, in particular to a converter cooling and secondary start-up method. Background technique [0002] The current situation faced by the steel industry is relatively severe. First, the contradiction of oversupply has existed for a long time. The national crude steel production capacity has reached 1.2 billion tons, while the demand of downstream industries has shrunk sharply. It is difficult to withdraw backward steel production capacity, and the outstanding contradiction of overcapacity will be difficult to resolve in the short term, and market competition will become more intense. Second, steel and iron ore prices continued to decline. Third, the industry-wide losses have intensified. Therefore, iron and steel enterprises are bound to face the problem of "removing inventory and reducing production capacity". As far as steelmaking plants are concerned, starting and stopping converters at any ...

AI Technical Summary

Problems solved by technology

Third, the industry-wide losses have intensified

After the furnace is shut down for a long time to cool down, especially in the case of low winter temperatures in the north, the carbon in it is easily oxidized, resulting in pulverization and peeling of the magnesia-carbon bricks, and the safety of the iron-mixed production cannot be guaranteed again.

The entire set of lining bricks can only be dismantled and scrapped, but a set of lining bricks for a 100-ton converter weighs more than 300 tons and is worth more than one million yuan, which is unbearable for the production cost of the steelmaking plant.

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