Method for dynamically controlling steelmaking process of bottom blowing O2-CO2-CaO converter
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An o2-co2-cao, converter steelmaking technology, applied in steel manufacturing process, manufacturing converter, sustainable manufacturing/processing, etc. problems, to avoid overoxidation, promote the balance of metallurgical reactions, and improve the quality of molten steel
Active Publication Date: 2020-08-07
UNIV OF SCI & TECH BEIJING
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[0005] In view of the above problems, the present invention proposes a bottom-blown O 2 -CO 2 -CaO converter steelmaking process dynamic control method, which solves the existing technical problems such as large fluctuations in the final composition of the conventional converter steelmaking process, overoxidation of molten steel, and long blowing time
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Embodiment 1
[0026] 3. Embodiment 1: the present invention is applied to blow O at the bottom of 120t 2 -CO 2 -CaO converter steelmaking process, the top blowing gas is O 2 , the bottom-blown central gas includes O 2 +CO 2 , the protective gas for the bottom blown ring seam is CH 4 . Specific steps are as follows:
[0027] 1): The temperature of molten iron collected through the raw material parameter acquisition system is 1300°C, and the carbon content of molten iron is [%C] 0 =4.0%, silicon content [%Si] 0 =0.60%, phosphorus content is [%P] 0 =0.109%, the scrap carbon content is [%C] 0 =0.10%, silicon content [%Si] 0 =0.25%, phosphorus content is [%P] 0 =0.020%, the steel scrap ratio is 15%, the target carbon content is 0.02%, and the target temperature is 1635°C, which is transmitted to the blowing parameter calculation module, and the operation process in the early stage of blowing is formulated through the central control system.
[0028] 2): In the early stage of blowing, ...
Embodiment 2
[0032] Embodiment 2: The present invention is applied to blowing O at the bottom of 300t 2 -CO 2 -CaO converter steelmaking process, the top blowing gas is O 2 , the bottom-blown central gas includes O 2 +CO 2 , the protective gas for the bottom blown ring seam is CH 4 . Specific steps are as follows:
[0033] 1): The temperature of molten iron collected through the raw material parameter acquisition system is 1300°C, and the carbon content of molten iron is [%C] 0 =4.0%, silicon content [%Si] 0 =0.50%, phosphorus content is [%P] 0 =0.100%, the scrap carbon content is [%C] 0 =0.15%, silicon content [%Si] 0 =0.20%, phosphorus content is [%P] 0 =0.020%, the steel scrap ratio is 15%, the target carbon content is 0.02%, and the target temperature is 1635°C, which is transmitted to the blowing parameter calculation module, and the operation process in the early stage of blowing is formulated through the central control system.
[0034] 2): In the early stage of blowing, ...
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Abstract
The invention discloses a method for dynamically controlling the steelmaking process of a bottom blowing O2-CO2-CaO converter, and belongs to the technical field of steelmaking. The method is suitablefor the steelmaking process of the 30-300t bottom blowing O2-CO2-CaO converter. According to a steelmaking process of the bottom blowing O2-CO2-CaO converter, O2 is adopted as top blowing gas, O2+CO2mixed gas is adopted as bottom blowing gas, lime powder is sprayed into the converter from a bottom blowing spray gun, and molten steel ingredients of the converter steelmaking process are predictedbased on material conservation in combination with the ingredient data of molten iron in the converter and waste steel, converter blowing process converter gas ingredient data and bottom blowing equipment work conditions; the top blowing oxygen amount, the bottom blowing gas ratio and the lime powder flow are dynamically adjusted by stages according to the blowing end point target ingredient requirements; while the fire blowing point area temperature is reduced, the converter molten pool stirring effect is enhanced, conduction of slag metal reaction balance is promoted, and the carbon contentand phosphorus content of molten steel are reduced; meanwhile, peroxidation of a converter blowing end point is avoided, deoxidizing alloy consumption is reduced, the number of occluded foreign substances in steel is reduced, and the quality of the molten steel is improved; and on the basis of an efficient metallurgy reaction, the metal yield is increased again, the production cost is reduced, andthe smelting period is shortened.
Description
technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a bottom-blown O 2 -CO 2 -CaO converter steelmaking process dynamic control method. Background technique [0002] The converter steelmaking process can process molten iron and steel scrap of various compositions, and the furnace charge can be flexibly adjusted, and the blowing cycle is short and the production capacity is strong, so it has become the most widely used steelmaking method in the world. The converter steelmaking process uses top blowing oxygen as a means of heating and stirring the molten pool, and cooperates with bottom blowing to strengthen the stirring of the molten pool to provide better kinetic conditions for metallurgical reactions, and to produce carbon content, phosphorus content and temperature at the end point. molten steel. However, in the conventional converter smelting process, the stirring of the molten pool is not strong enough, and t...
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