Method for utilizing CO2 to control high-temperature fire point at jet flow impact area of coverter oxygen lance

Abstract

The invention relates to the technical field of steelmaking technology, in particular to a method for utilizing CO2 to control a high-temperature fire point at a jet flow impact area of a coverter oxygen lance. The method is suitable for the steelmaking process of a 30-400 t converter. According to the converter converting process, based on the metallurgical reaction characteristic of a molten pool, the CO2 proportion in a blowing gas is dynamically controlled at different periods, by utilizing the high-temperature reaction characteristic of CO2, at the earlier stage of converting, thermal radiation of the fire point is reduced, at the metaphase of converting, stirring of the molten pool is intensified to accelerate transmission of substance and energy between the fire point and the moltenpool, and at the later period of converting, peroxidation of molten steel is prevented, the metal yield is increased, and the temperature distribution and fire point volume of the oxygen lance jet flow impact area are controlled during the converting process to further improve the smelting effect.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a 2 A method for controlling the high-temperature fire point in the jet impact zone of the oxygen lance of the converter. Background technique [0002] Due to the extremely complex physical and chemical changes inside the converter, the harsh smelting environment, and the limitations of current research methods, there are few reports on the research on the high-temperature fire point in the oxygen lance jet impact zone of the converter, and practitioners can only regard the converter as a "black box". The system analyzes the relationship between converter material, energy and momentum input and output, and performs fuzzy control. [0003] On the other hand, with the development of high-efficiency smelting technology, the oxygen supply intensity of the converter steelmaking process is continuously increasing. The high-intensity oxygen jet directly contacts the conv...

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Problems solved by technology

[0002] Due to the extremely complex physical and chemical changes inside the converter, the harsh smelting environment, and the limitations of current research methods, there are few reports on the research on the high-temperature fire point in the oxygen lance jet impact zone of the converter, and practitioners can only regard the converter as a "black box". System, analyze the relationship between converter materials, energy and momentum input and output, and perform fuzzy control

[0003] On the other hand, with the development of high-efficiency smelting technology, the oxygen supply intensity of the converter steelmaking process is continuously increasing. The high-intensity oxygen jet directly contacts the converter molten pool. In the jet impact zone, the strong metallurgical exothermic reaction leads to a sharp increase in heat. Limited by the transient heat absorption capacity of the converter steelmaking molten pool, it is difficult to effectively release the heat in the jet impact area, resulting in a high-temperature fire point area above 2700 °C, which causes a large amount of iron to evaporate. It is too late to pass into the molten pool, and as the flue gas is discharged, it will cause a huge waste of input energy of the converter

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