Sublance fixed-carbon fault emergency treatment method

Abstract

The invention discloses a sublance fixed-carbon fault emergency treatment method, and belongs to the field of steel smelting. The method comprises the steps that S01, a carbon content prediction equation, [C] = A + B * (CO)%,is established in advance, wherein [C] represents the molten steel carbon content, A and B represent coefficients corresponding to a converter, and (CO)% represents the converter gas CO content peak value after sublance fixed-carbon measurement; S02, when a sublance fixed-carbon fault occurs, a converter gas CO content peak value (CO) 0% after the current measurement is acquired, and the peak value (CO) 0% is substituted into the carbon content prediction equation to acquire a molten steel carbon content prediction value [C0]; and S03, according to the predicted value [C0] of the carbon content of the molten steel, how to smelt subsequently is determined. According to the method, the accuracy and timeliness of prediction on the molten steel carbon content when the sublance fixed-carbon fault occurs can be greatly improved, the correctness and reliability of subsequent judgment and operation of on-site staff are ensured, the emergency treatment efficiency after the sublance fixed-carbon fault occurs is improved, and meanwhile the production quality of steel is ensured.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to an emergency treatment method for faults of a secondary gun for carbon determination. Background technique [0002] In the process of converter steelmaking, the actual decarburization speed is "slow at both ends and fast in the middle". In the early stage of blowing, the decarburization rate increases almost linearly with the blowing time; in the middle stage of blowing, the decarburization rate almost depends only on the intensity of oxygen supply; in the later stage of blowing, when the carbon content drops to a certain level, the carbon diffusion rate decreases , the oxidation rate of carbon also drops sharply to be similar to that at the beginning of blowing, but the oxidation rate depends on the concentration and diffusion rate of carbon, and is proportional to the carbon content. In general, when the oxygen supply is about 85% in the middle and late stages of smeltin...

AI Technical Summary

Problems solved by technology

However, due to the long-term use of sub-guns to determine carbon, the experience and skills of converter operators to judge carbon content have declined and are uneven, and the judgment is extremely inaccurate

If the estimated value of carbon content is low, that is, the actual carbon content is high, the actual amount of auxiliary blowing oxygen supply will be too small, resulting in low oxygen content at the end of the molten steel, which will eventually lead to high phosphorus content in molten steel; if the estimated carbon content Too high, that is, the actual carbon content is low, which will lead to too much oxygen supply in the auxiliary blowing, resulting in high oxygen content at the end of molten steel, and overoxidation of molten steel.

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