Furnace gas analysis model-based decarburization control method of vacuum oxygen decarburization refining

Abstract

The invention discloses a furnace gas analysis model-based decarburization control method of vacuum oxygen decarburization refining. The furnace gas analysis model-based decarburization control method comprises following steps: after vacuum pumping, pre-treatment, and oxygen lance oxygen blowing, exhaust gas parameter information, including furnace gas generation amount and furnace gas composition, of an oxygen blowing period is calculated; oxygen blowing decarburization rate is calculated based on the furnace exhaust gas parameter information; tracking calculation on molten steel carbon content is carried out; determination on oxygen blowing decarburization rate correction factors and molten steel carbon content correction computation is carried out; determination on finish of top lance oxygen blowing is carried out; exhaust gas related parameter information, including suction air amount and exhaust gas flow amount calculation, furnace gas generation amount calculation, and furnace gas composition calculation, at a vacuum period is calculated; vacuum treatment decarburization rate is calculated; molten steel carbon content is calculated; stop determination on deep vacuum free decarburization treatment is carried out; and subsequent processing is carried out until VOD (vacuum oxygen decarburization) processing is finished. The furnace gas analysis model-based decarburization control method is capable of reducing interference of environment change on furnace gas detection information, and can be used for model calculation and process monitoring more effectively, and for accurate control on process oxygen blowing and vacuum treatment time.

Description

technical field [0001] The invention relates to a control method for vacuum oxygen blowing decarburization refining. Background technique [0002] Vacuum Oxygen Decarburization (Vacuum Oxygen Decarburization, VOD) mainly uses the principle of vacuum conditions to promote carbon-oxygen reaction and reduce the oxidation of chromium to carry out decarburization smelting. The stainless steel molten steel placed in the ladle in the vacuum tank is blown with oxygen by a top-blown oxygen lance to obtain oxygen. The oxygen dissolves in the molten steel and reacts with the carbon in the molten steel. The carbon in the liquid reacts, so that a very low carbon content can be obtained. The VOD method is an ideal method for producing stainless steel, especially ultra-low carbon and nitrogen stainless steel. [0003] Through reasonable oxygen blowing control, to achieve effective decarburization, and to control the oxidation of alloying element chromium, reduce reduction consumption, sh...

AI Technical Summary

Problems solved by technology

In practical applications, the carbon content of molten steel at the beginning of VOD treatment is several tens of times that of the target carbon at the end point. It is difficult to achieve accurate tracking and control of the entire decarburization process only by using the model. The greater the relative deviation of the content, it is difficult to achieve precise control

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