A Novel Process Control Model for Extracting Vanadium Semi-Steel in Basic Oxygen Furnace Based on Steelmaking Mechanism

摘要

A novel process control model for basic oxygen furnace (BOF) steelmaking is proposed based on metallurgy mechanism, with lower contents of carbon, manganese, silicon, and lower temperature in semi-steel after extracting vanadium. According to mass balance and heat balance, a static control model is built up, with slagging model, temperature model, and oxygen supply model. When actual amount of oxygen supply reaches 85% of theoretical value calculated by static model, quasi-dynamic control model is activated to predict carbon and temperature in later period of steelmaking. A steelmaking process control system for semi-steel smelting on 120 tonne BOF is developed in a steelmaking plant in China. Based on test of three steel grades, this model acts a guide for BOF steelmaking with semi-steel, not only providing tactic, but also pointing out a feasible method for BOF process control without sub-lance or off-gas analyzer.