Method for treating converter mouth slag through oxygen blowing by oxygen lance

Abstract

The invention discloses a method for treating converter mouth slag through oxygen blowing by an oxygen lance. The method includes the steps of arranging the position of the oxygen lance and setting the oxygen pressure. Specifically, the method includes the steps of building a mathematic model between the position h of the oxygen lance and an impact converter mouth diameter Dimpact, the number M of spraying holes of the oxygen lance, the included angle alpha between the spraying holes and the center of the oxygen lance as well as the expansion angle beta of spraying holes of a Laval nozzle and determining the position h of the oxygen lance through the mathematic model, wherein h is equal to Dimpact / [(M+1)*tan(alpha+beta)] according to the mathematic model; and setting the oxygen pressure of the oxygen lance to be 60-65% of the normal work pressure of the oxygen lance, and carrying out slag removal operation in the sample waiting process after converting, lance lifting, temperature measuring and sampling. According to the method, by reasonably arranging the position of the oxygen lance and setting the work pressure and the oxygen blowing time, the converter mouth slag is treated through oxygen blowing by the oxygen lance, and damage to converter equipment and converter linings is avoided. Compared with methods of treating the slag through a converter disassembly machine, the method has the advantages that 25 minutes is saved each time, the production and operation efficiency is greatly improved, the operation is safe and fast, and the slag clearing effect is good.

Description

technical field [0001] The invention relates to a method for treating slagging at the mouth of a converter by blowing oxygen with an oxygen lance, and belongs to the technical field of converter steelmaking technology. Background technique [0002] The slagging at the furnace mouth of the converter is a major problem that plagues the steelmaking production of the converter and the life of the furnace mouth and the furnace shell. The so-called furnace mouth slagging means that the slag and metal particles are welded together, and the adhesion is accumulated on the upper part and the inner ring of the water-cooled furnace mouth, with a thickness of up to 300mm, and some can irregularly extend from the furnace mouth down to the trunnion. The conical structure of the cap is combined, and it just snaps on the furnace mouth. The slag has not been fully melted in the early stage of blowing and the metal splash that is easy to occur during the slag back-drying period is one reason ...

AI Technical Summary

Problems solved by technology

The slag has not been fully melted in the early stage of blowing and the metal splash that is easy to occur during the slag back-drying period is one reason for the slagging at the furnace mouth, and the slag splashing of the remaining steel is another reason for the slagging at the furnace mouth; when the slagging at the furnace mouth is serious, the thickness It can reach more than 400mm, resulting in serious consequences such as damage to the sub-gun, jamming of scrap steel, and difficulty in loading iron

At present, the conventional treatment method is to use a furnace demolition machine to open the furnace mouth. Although this method can remove the slagging at the furnace mouth, it often causes serious damage to the equipment and refractory bricks near the furnace mouth or even falls off. At the same time, it takes at least ten minutes for each treatment. As long as forty to fifty minutes, it takes up a lot of production time and seriously affects the operation rate of the converter