BOFdePhos – Control of Dephosphorisation in BOF process

Initial situation:

  • 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.

Working topics:

  • 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.

 

Results:

  • 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.

Siehe auch

CheckSIS –
Performance assessment
for automatic surface
inspection systems

Initial situation In modern steel production, automatic surface inspection systems (ASIS) are commonly used to detect and classify surface defects […]

Presed – Predictive Sensor Data mining

Initial situation: Some steelworks experiences problems with product deficiencies like slivers and cracks. Several pre-studies indicated a relationship between the time […]

FlexGap – Industrielle Demonstration einer neuen, adaptiven Flachführung

Mit mehr und mehr hochfesten Stählen müssen die Walzgerüste an die daraus resultierenden höheren Walzkräfte angepasst werden. Aufgrund der größeren […]

OptDeslag – Improved deslagging and slag conditioning

Initial situation: Performance of many metallurgical operations is significantly influenced by the condition of the slag Therefore in some cases […]