Analyzing metallurgical characteristics of converter melt pool and exploring mode of three reaction zones
The mechanism model of converter smelting has developed rapidly,but there are still many problems,such as the disconnection between model parameters and actual blowing and feeding conditions,and the inconsistency between predicted results and actual situations.The establishment of metallurgical models based on mechanism analysis methods such as multiple reaction zones in the converter melt,minimum Gibbs free energy theory,thermodynamic and kinetic coupling reactions has gradually become a consensus in the industry.Changes in the composition of molten steel and slag during the converter melt reaction process were studied and demonstrated the common issues of metallurgical laws in the smelting process.The analysis of the important characteristics of the molten pool reaction was also conducted.Moreover,the mechanism of synchronous changes in FeO accumulation and consumption during the smelting process,the equilibrium state of the reaction interface layer,and the slag-forming route of slag material in the smelting process were proposed.Based on the theory of multiple reaction zones in the converter,the molten pool was divided into"gas-steel liquid"jet impact zone,"slag-metal droplets-furnace gas"emulsification zone,and"slag-steel liquid(metal droplets)"slag zone.An oxygen allocation model for dynamic regulation of three reaction regions with values ranging from 10%～20%:45%～65%:40%～25%was established.Application of the model based on the mixing and stirring of the melt pool in the three reaction zones of the converter showed that when the comprehensive stirring energy was in the range of 0.60～0.75,the variation range of the equivalent mass transfer coefficient at the reaction interface was 1.019～1.024.
converterthree reaction zonesminimum Gibbs free energythermodynamic and kinetic couplingmetallurgical model
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维普
