Efficient bottom blowing method for improving steelmaking flow field in converter blowing

Abstract

The invention provides an efficient bottom blowing method for improving a steelmaking flow field in converter blowing. Gas supply units with the number n are mounted at the bottom of a converter, and n is more than or equal to 6 and less than or equal to 16; the change of the air flow of each single air supply unit in one cycle is distributed in a sine curve manner; and all the gas supply units are sequentially started for injection according to a clockwise or anticlockwise sequence. According to the efficient bottom blowing method, molten steel in the converter can sequentially move according to the sine rule, so that the molten steel forms a regular water flow direction in the horizontal direction, the mixing degree between gas supply unit areas is effectively improved, mixing dead angles are avoided, the stirring capacity of bottom blowing gas is improved, and the uniform mixing time is shortened.

Description

technical field [0001] The invention relates to the technical field of converter top and bottom combined blowing, in particular to a high-efficiency bottom blowing method for improving the steelmaking flow field in converter blowing. Background technique [0002] Converter top and bottom blowing is a new technology. After combining top blowing and bottom blowing, it retains the advantages of the oxygen lance top blowing method, which is easy to control the slagging process, and overcomes the weak ability of pure top blowing oxygen to stir the melt in the converter. The disadvantages are of great significance to the field of steelmaking. [0003] The purpose of the converter bottom blowing is to stir the molten steel in the converter, shorten the stirring time on the premise of improving the uniformity of the molten steel, and improve the production efficiency of the converter. At present, in order to improve efficiency, the number of breathable bricks is usually increased u...

AI Technical Summary

Problems solved by technology

At present, in order to improve efficiency, the number of breathable bricks is usually increased under the premise that the total air flow remains unchanged. The breathable bricks are evenly distributed at the bottom of the converter, and the gas is simultaneously blown into the converter to stir the molten steel in the converter; although this method can It satisfies the need to reduce the amount of gas, but there are still the following disadvantages: First, the increase in the number of permeable bricks will divide the molten steel in the converter into more regions, and the gas of the permeable bricks will be blown vertically upwards, resulting in a decrease in the degree of mixing between the regions; The second is that although the increase in the number of air-permeable bricks will make the molten steel in a state of strong movement at the same time, the regular movement direction of the molten steel is vertical movement, but the horizontal direction cannot produce regular flow, making the horizontal flow of the molten steel chaotic. Molten steel will collide with each other in the area of ​​the first breathable brick and adjacent breathable bricks, which will reduce the stirring force of the bottom blowing gas, and then make the uniformity of the mixed molten steel worse, which not only prolongs the mixing time, but also affects the product. impact on the quality of

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