Carbon determination method for converter steelmaking flue gas analysis

Abstract

The invention provides a carbon determination method for converter steelmaking flue gas analysis, belonging to the field of iron and steel metallurgy. The method includes the following steps: firstly,according to the principle of mass conservation, calculating a decarburization rate of a molten pool in combination with the CO and CO2 percentage contents of the flue gas and the flue gas flow obtained by detection equipment in a converter smelting process; secondly, introducing a concept of molten pool mixing degree into an end point carbon curve fitting index model; and then, according to themolecular theory of metallurgical slags and the characteristics of steel grades produced, obtaining compositions of final smelting slags and the temperature of molten steel at a smelting end point, and calculating a limiting carbon content W[C]0 of the smelting molten pool; and finally, obtaining a carbon determination model for converter steelmaking flue gas analysis. The model in the method introduces the concept of molten pool mixing degree, and fully considers the influence of operating process parameters such as oxygen lance positions, top-blown oxygen flow and bottom-blown gas flow on the decarburization process of the converter molten pool; and the limiting carbon content W[C]0 of the molten pool can be calculated by using the activity of molten slags according to actual smelting steel grades, and higher accuracy can be realized.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for analyzing and determining carbon in converter steelmaking flue gas. Background technique [0002] Oxygen converter steelmaking is currently the most important steelmaking method in the world. my country's converter steel production accounts for more than 90% of the total steel production, and the decarburization reaction runs through the converter steelmaking process. A key indicator of whether converter blowing has reached the end of smelting is whether the carbon content of molten steel in the molten pool of converter steelmaking meets the requirements for tapping; in this regard, the sub-lance technology is widely used in large and medium-sized converters in various steel mills to obtain the carbon content of molten steel at the end of smelting . However, key smelting information such as decarburization rate in the converter bath cannot be continuously ob...

AI Technical Summary

Problems solved by technology

The carbon curve fitting model for the end point of converter smelting focuses on the late stage of blowing. Currently, the common end point carbon curve fitting models include the cubic model and the exponential model. Although these two end point carbon curve fitting models for converter smelting avoid the difficult However, it does not consider the influence of operating process parameters such as oxygen lance position, top-blowing oxygen flow rate, and bottom-blowing gas flow rate on the decarburization rate of the converter melt pool during the actual blowing process.

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