An auxiliary method for predicting the end point of converter steelmaking

Abstract

The invention relates to a method of supplementarily forecasting the steelmaking finishing point of a converter, belonging to the field of ferrous metallurgy. The method comprises the steps of: aiming at small and medium converters without dynamic detection equipment, calculating the addition quantity and oxygen consumption of auxiliary materials by an industrial control computer and a process database according to the initial converter blowing metal filling information and the target carbon content and temperature of molten steel at the finishing point; calculating the carbon content and temperature of a blowing process molten pool in real time according to the blowing process information; and calculating the content of Mn, P and S in the molten steel when the blowing achieves the finishing point. The method is applied in production practice of 80t converters, and test results show that the forecasting values on the compositions and temperature of the molten steel at the steelmaking finishing point of the converter by adopting the method are close to the practical value, an operator can be assisted for accurately controlling the steelmaking finishing point of the converter, thereby continuously improving the steelmaking finishing point control level of the converter.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular provides a method for assisting in predicting the end point of converter steelmaking. The method is suitable for the production of various high, medium and low carbon steel products by small and medium-sized converters. Background technique [0002] 1. Converter steelmaking is currently the most important steelmaking method in the world, and its steel production accounts for more than 60% of the total steel production. Continuously improving the control level of the end point of converter steelmaking is the goal pursued by metallurgists. In order to achieve the goal of high hit rate in the end point control of converter steelmaking, converter blowing has developed from the previous manual experience operation to the direction of automatic steelmaking. At present, the more commonly used method in steel mills is to combine the mathematical model of steelmaking process wit...

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Problems solved by technology

[0003] 2. Large-scale converters can use dynamic detection equipment such as auxiliary lances and furnace gas analysis, combined with corresponding mathematical models to achieve accurate hitting of the steelmaking end of the converter; small and medium-sized converters are limited by the furnace mouth of the converter, and cannot be equipped with such dynamic auxiliary lances. Testing equipment, while most domestic small and medium-sized converters are not equipped with furnace gas analysis and testing equipment

[0004] 3. For these converters that lack dynamic detection equipment, some adopt the converter bomb detection technology to control the end point of converter steelmaking without turning down the furnace, but the equipment investment cost of this method is relatively high; some still use The end point is judged by manual experience, and the end point of the converter steelmaking is controlled according to the information obtained from the sampling analysis of the inverted furnace. However, the production efficiency of the converter is low in this method, and the hit rate of the end point is limited.

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