Vacuum tank degassing
The objective of the vacuum tank degassing treament is to remove tramp
elements, such as oxygen, hydrogen, nitrogen or sulphur, from the
steel. These aims are achieved by gas-stirring under vacuum atmosphere.
However, clogging of the bottom nozzles constitutes a major problem. In
order to counter this problem, vibration-based method was used to
identify the effectivity of gas stirring and identify malfunctions.
test installation of a vibration-based monitoring system was conducted.
On the basis of the results obtained, two indices were proposed for
- M. Pylvänäinen, V.-V. Visuri, J. Nissilä, J. Laurila, K. Karioja, S. Ollila, T. Fabritius,
and T. Liedes, “Vibration-Based Monitoring of Gas-Stirring Intensity
in Vacuum Tank Degassing,” Steel Research International, vol. 91, no. 6, 1900587, 2020.
- M. Pylvänäinen, V.-V. Visuri,
T. Liedes, J.
Karioja, S. Pikkupeura, S. Ollila, and T. Fabritius, ”Vibration-based
Assessment of Gas Stirring Intensity in Ladle Treatments”, Proceedings
of the 5th International Conference on Process Development in Iron and
Steelmaking, Swerea MEFOS, Luleå, Sweden, no. 14, 2016.