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Vibration‐Based Monitoring of Gas‐Stirring Intensity in Vacuum Tank Degassing
Author(s) -
Pylvänäinen Mika,
Visuri Ville-Valtteri,
Nissilä Juhani,
Laurila Jouni,
Karioja Konsta,
Ollila Seppo,
Fabritius Timo,
Liedes Toni
Publication year - 2020
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201900587
Subject(s) - ladle , argon , materials science , intensity (physics) , work (physics) , vibration , mechanical engineering , metallurgy , engineering , acoustics , chemistry , optics , physics , organic chemistry
Liquid steel is typically stirred in a vacuum tank using argon gas injection to achieve a homogeneous composition and high‐purity steel. The aim of this work is to study the effect of vessel vibration on the operational state monitoring of the gas stirring in a vacuum tank degasser. Following an extensive analysis of vibration features, the root mean square (RMS) of vertical velocity is found to be the best feature for the measurement of the stirring intensity caused by the volumetric gas injection rate into the ladle. Smoothing is conducted using a centered median filter with a window length of 21 s. In this work, the operational state monitoring of gas stirring is described using a ladle responsiveness value (LRV). This describes the ability of a ladle to generate the maximum amount of vibration with the minimum amount of argon gas. The LRV summarized for each ladle reveals significant differences between them. Correspondingly, a rolling ladle responsiveness value (rLRV) is used for online monitoring of possible gas leakages. The rLRV can also be used for the online monitoring of the stirring efficiency and as its comparison with the overall efficiency of a specific ladle or all ladles.