A method for controlling extremely low carbon-oxygen concentration product during the whole converter operation

By linking the content of silicon molten iron, temperature, smelting steel grade and scrap steel in real time in the converter, and combining strong bottom blowing technology to reduce the Pco partial pressure, the problems of high carbon oxygen accumulation and unstable bottom blowing effect in the top-bottom reblowing converter are solved, and the effective control of low carbon oxygen accumulation is achieved, extending the life of the converter and improving the quality of the molten steel.

CN116536474BActive Publication Date: 2025-04-04МААНЬШАНЬ АЙРОН ЭНД СТИЛ КО ЛТД
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Patent Information

Application Number
CN202310347985.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-31
Publication Date
2025-04-04
Estimated Expiration
2043-03-31

AI Technical Summary

Technical Problem

In the prior art, carbon oxygen accumulation in the top-bottom reblowing converter process is high, the bottom-blowing effect is unstable, and the converter life is short.

Method used

By linking the content of silicon molten iron, temperature, smelting steel seeds and scrap steel in real time in the converter, on the basis of heat balance of the converter and combining strong bottom blowing, a low-carbon oxygen accumulation control technology is constructed to reduce the Pco partial pressure as a means.

Benefits of technology

It effectively reduces the oxidation properties of molten steel and slag, reduces the chemical corrosion of steel and slag on the furnace lining, reduces the consumption of deoxidants and alloys, and improves the dephosphorization rate and molten steel quality.

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Abstract

The present invention discloses a control method for extremely low carbon and oxygen concentration product of the whole converter service, which belongs to the technical field of steel smelting. The method of the present invention comprises: step one, selection of furnace bottom material and bottom blowing element type; step two, setting of stage furnace bottom control range; step three, dynamic monitoring of converter bottom; step four, heat balance control; step five, bottom blowing intensity control; step six, oxygen supply and slag making; step seven, slag splashing; step eight, furnace bottom control; in the design stage of refractory materials for new furnaces, the operations of step one and step two are completed, and after opening a new furnace, steps three to eight are repeated to complete the carbon and oxygen concentration product control of the whole converter service. The present invention realizes real-time linkage between molten iron silicon content, temperature, smelting steel type and scrap steel addition, and on the basis of converter heat balance, constructs a low carbon oxygen product control technology by reducing Pco partial pressure as a means to reduce the oxidizability of molten steel and slag, and reduce the chemical erosion of steel and slag on the furnace lining.
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