Vacuum tank degassing
The objective of the vacuum tank degassing treatment is to remove tramp
elements, such as oxygen, hydrogen, nitrogen or sulphur, from the
steel. This is achieved by gas stirring under a vacuum.
However, clogging of the bottom nozzles constitutes a major problem. In
order to counter this problem, a vibration-based method was used to
assess the effectiveness of gas stirring and identify malfunctions.
Highlights
- A
test installation of a vibration-based monitoring system was conducted.
On the basis of the results obtained, two indices were proposed for
control purposes.
Selected publications
- J. Nissilä, M. Pylvänäinen, J. Laurila, S. Ollila, V.-V. Visuri, and T. Liedes, “Detecting Gas Injection Problems in Vacuum Tank Degassing Using
Measurements of Multiple Variables", Proceedings of the 5th International Conference on Maintenance, Condition Monitoring and Diagnostics 2021 (E. Juuso and D. Galar, eds.), Lecture Notes in Mechanical Engineering, Springer Nature Singapore Pte Ltd, Singapore, 2023
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- 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.
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- M. Pylvänäinen, V.-V. Visuri, T. Liedes, J. Laurila, K. 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.