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Dynamic process models were developed for degassing and desulphurisation, based on fundamentals of thermodynamics and reaction kinetics. The degassing model takes into account the additional pressure in ascending gas bubbles, resulting from their retarded expansion because of the inertia of steel which has to be displaced. Just below the bath surface, this additional pressure is much higher than the low vessel pressure at which vacuum degassing processes are normally operated.

The model parameters for dehydrogenation and denitrogenation were identified by adapting offline simulation results to process data collected at the vacuum tank degassing plants of Buderus and Sidenor. For the online application of the model at Buderus, the only necessary process data are the vessel pressure and the stirring gas flow rate. Without steel analysis before vacuum, the performance is nearly as good as from the offline simulations. The standard deviation of the error, i.e. the difference between simulated and analysed content after vacuum, increased from 0.20 to 0.24 ppm for hydrogen, and from 9 to 12 ppm for nitrogen. .

Additional information

Authors: KOHLE S, BFI, Dusseldorf (DE);KLEIMT B, BFI, Dusseldorf (DE);LICHTERBECK R, BFI, Dusseldorf (DE);JOHANN K.P, Edelstahlwerke Buderus, Wetzlar (DE);STENDER-ROBERTZ J, Edelstahlwerke Buderus, Wetzlar (DE);LARAUDOGOITIA J, Sidenor I+D, Basauri (ES);ORS F, Sidenor I+D, Basauri (ES)
Bibliographic Reference: EUR 19484 EN (2001), pp.70. Euro: 10.00
Availability: Available from EUR-OP Sales Agents
ISBN: ISBN: 92-894-1220-8
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