BOF smelting model based on coupling reaction mechanism
Complex multivariate and multiphase coupling reactions occur inside the converter.Since the static con-trol model can only consider the beginning and end states of the converter smelting process,it is impossible to know the continuous molten steel composition and temperature changes in the entire smelting process,making it difficult to accurately control the end point of the converter steelmaking.Therefore,the mechanism model of the converter smelting process is of great guiding significance to actual production.Based on the static model,the converter smelt-ing process model is established based on the coupling reaction mechanism,and software that can be used for model calculation is written in C#language.The model can calculate the slag-making agent,coolant,and oxygen con-sumption required in the smelting process,and can calculate the temperature of the bath,the composition of the bath,and the composition of the slag with the blowing time,and make a more accurate prediction of the tempera-ture,composition,and slag composition of the molten steel end point.By changing the operating parameters of the model,the influence of different oxygen supply intensities on the decarbonization rate and the influence of bottom blown argon air flow on the dephosphorization rate were studied.The results show that the change in oxygen supply intensity has a more obvious impact on the early and mid-stage of the decarbonization process,and it has a smaller impact on the late stage of the decarbonization process.The increase of the bottom blown argon air flow has a greater impact on the early stage of the dephosphorization process,which can increase the rate of the dephosphorization reac-tion,but with the increase of the argon air flow,the FeO content in the slag decreases,resulting in a decrease in the dephosphorization rate.By comparing the actual data of 100 furnaces of a steel mill converter with the calculation results of the model,it was found that the hit rate of the carbon content of the end point of molten steel in the range of deviation-0.02%-0.02%is 89%,and the hit rate of the end point of molten steel temperature in the range of deviation(t±10)℃is 83.0%.The deviation between the actual measurement data and the theoretical calculated value within a certain range is small,which has the significance of guiding practical production.
converter smeltingend point controlmechanism modelcoupling reactiondynamics
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