Automation Steelmaking Model Based On The Analysis Of The Furnace Gas

This paper established converter steelmaking control mathematical model based on the analysis of the furnace gas through the thermodynamics and kinetics analysis of oxidation reaction of each element. Establish the online forecast software according to the mathematical model and conduct offline simulation. The results show that the software has good hit rate and has guiding significance for the actual production of converter.According to the characteristics of the physical and chemical reactions in the furnace, we can establish the steel forecast mathematical model. It includes converter gas correction module、decarburization rate module、element oxygen analysis module、 lime melting speed module、 quality of slag composition module、 melting liquid temperature calculation module、composition and quality calculation module. In the converter gas correction module, according to the nitrogen balance, we can calculate the secondary combustion in the furnace and the funnel to get the precise initial furnace gas composition which will provide data for the precise calculation of the model. Decarburization rate module method will be used in different smelt period. In the element oxygen analysis module, we can get each element`s oxidation distribution coefficient by the concrete analysis and gibbs free energy of each oxidation reaction. Lime melting speed module can be calculated by the slag material components.Using VB6.0 and SQL Sever2000 compile forecast software to do offline simulation. Offline simulation is based on the analysis of gas information to predict the abnormal furnace condition, and along with the analysis of the abnormal furnace we can get the influence for the simulation accuracy. The offline simulation results show that the temperature prediction deviation within 20 ℃ occupy 84.8%; the endpoint carbon forecast deviation less than 0.02% occupy 82%; the double shot reach up to 73.9%.