Indirect Measurement of Behaviors of Process Variables in Converter Process Based on the Exhaust Gas Information

Abstract

For the improvement of the endpoint control of BOF, a new mathematical model has been developed, which combines dynamic equations of material and heat balance with the exhaust gas information based on mass-spectrometer.
The outline of model calculation is as follows;
(1) By use of the amount of oxygen and submaterials which come into BOF and the composition and flow rate of the exhaust gas which goes out of BOF, the amount of oxygen consumed in the surface of cavity and oxygen consumed by decarburization can be determined.
(2) By including the above calculated value of the amount of oxygen in the model based on reaction theory, the transition of composition and temperature of steel bath can be estimated.
At No. 1 BOF shop in Wakayama Steel Works, the model is being used for the guidance of the operation and contributes to the reduction of reblow ratio.