BOFdePhos – Control of Dephosphorisation in BOF process
End-point control of the Oxygen Steelmaking Converter (BOF) process is mainly based on results of a static charge calculation and observation of decarburisation based on off-gas data.
Information on dephosphorisation behaviour and achievement of the final P target value is normally not available. Thus quite often a reblow due to high P content, and also for steel temperature adjustment is required.
Enhancement of existing dynamic converter models based on fundamental investigations of thermodynamic equilibrium conditions and mass flows determining the reaction kinetics, using appropriately extended thermo-dynamic data bases within ChemApp or FactSage and suitable CFD simulations.
Trials with special sublance probes for on-line determination of the slag oxygen content.
Development of model based dynamic control strategies for precise determination and optimal adjustment of the process end-point regarding phosphorus content and melt temperature, in order to achieve direct tapping after sublance measurement without waiting for steel probe analysis.
Comprehensive dynamic model for the BOF process for on-line monitoring with focus on dephosphorisation, taking into account slag conditions and melt temperature.
Accurate end-point determination with calculation of optimal set-points for oxygen blowing and slag former additions, to achieve the target values with higher resource efficiency.