SMS Siemag AG, Düsseldorf, Germany:

Hoffmann A., Mag. Phys., Head of Process Simulation in Metallurgy and Continuous Casting, axel.hoffmann@sms-siemag.com

Reichel J., Dr., Technical Referent in Basic Oxygen Steelmaking and Secondary Metallurgy

Loginov S., Mag. Sc., Technologist, Electric Arc Fernaces and Converters

SMS India Pvt. Ltd., Gurgaon, India:

Das S.,  Bach. Eng., General Manager Metallurgy

Inexact operating conditions are frequently the limiting factor in process models for steelmaking plants. Typical process route of a BOF steel plant is analyzed in this paper. To minimize the problems, SMS Siemag AG has examined the effects which operating conditions such as errors in the hot metal weight and in hot metal analysis have on the result of the BOF model at the end of blowing and conducted tests in several steelmaking plants. Hot metal charging at Jindal South West Steel Ltd. is considered. Process phases of the BOF process with related decarburization rates are examined. Special emphasis was put on a novel corrective calculation in order to improve the results despite adverse conditions. General BOF process and BOF model are overviewed with describing input data and calculated set-points. This corrective calculation is based on a sublance measurement and on the evaluation of the waste-gas analysis during the dynamic phase. Effect of variation in input data and detection of end-of-blow via waste gas measurement are considered. Possibilities of BOF Duplex process are investigated meaning metal dephosphorization. The desired aims in terms of carbon and temperature could thus be achieved even under suboptimal conditions.