A control method for increasing the blowing end temperature of steelmaking converter

Abstract

The invention relates to a control method for increasing the blowing end point temperature of a steelmaking converter. Firstly, the addition amount of steel scrap cold material and the type and quantity of the first batch of blowing material are determined. At the end of the oxidation period of silicon and manganese, the alkalinity of steel slag The range is 1.1-1.8, the MgO content in the slag is 4.0%-6.5%, the TFe content is 15%-23%, and the molten iron temperature is 1385-1425°C; Calcium and magnesium-containing slagging material and iron-containing oxide cold material; steel slag alkalinity ranges from 2.7 to 3.4, MgO content in slag is 7.5% to 10.5%, TFe content is 13% to 19%; gun operation. The method ensures that the slagging reaction in the whole process of converter blowing is compatible with the reaction process of molten iron, stabilizes the heat dissipation coefficient and the temperature rise rate in the process of converter blowing, and improves the temperature control capability at the end point of steelmaking converter blowing.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking temperature control, and in particular relates to a control method for increasing the blowing end point temperature of a steelmaking converter. Background technique [0002] The converter end point temperature is an important indicator of the converter process, and the stability of its control directly affects the production rhythm, cost, and converter life. Therefore, it is necessary to stably control the converter end point temperature. At present, the technologies for controlling the temperature at the end point of the converter mainly include the sub-gun method and the static model calculation method, or both are used at the same time. Among them, the sub-lance method is to use the sub-lance system to measure the temperature of the molten pool and the carbon content of the molten pool when the blowing is close to the end, and adjust the operation to greatly improve the hit rate o...

AI Technical Summary

Problems solved by technology

Among them, the sub-lance method is to use the sub-lance system to measure the temperature of the molten pool and the carbon content of the molten pool when the blowing is close to the end, and adjust the operation to greatly improve the hit rate of the smelting end point. However, the sub-lance equipment is expensive and can only be used for more than 120t. Converter, at the same time, the probe consumes a lot; the static model calculation method determines the smelting plan and the amount of auxiliary materials based on the requirements of the steel type and the initial information of the raw materials, but due to the uncertainty in the blowing process, the end point hit rate is generally less than 60%

In summary, the existing technology has the problems of low end-point hit rate, poor economy, and narrow application range. Therefore, for establishing a key temperature control method with good economy, high end-point hit rate, wide application range and stable process control, It is of great significance to improve the efficiency of converter smelting and the quality of molten steel

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