1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China; 2. Steelmaking Plant, Benxi Iron and Steel Company, Benxi 117000, Liaoning, China
Abstract：The principle，operation of BOF offgas analysis dynamic control model and measures to deal with excese carbon content at endpoint are introduced.The relation ship between carbon content in bath and decarbonization rate was studied. The conclusions are: To ensure the stability of the endpoint prediction, the lance position should be fixed and no additions should be charged 2 min before blowing end; w［C］<0.04% should be reached with low lance position, or blowing 15 s after cross of CO2 and N2 curves,before deciding whether to raise lance when the carbon content is high at endpoint; Taking into account the impact of lance position on decarbonization rate, the relation ship between carbon content and decarbonization rate at endpoint can be expressed by a cubic function;Thermal equilibrium can be used for predicting bath temperature at endpoint only with stable raw materials supply and operation.
2007, Vol. 42 
