University of Oulu

Pylvänäinen, M., Visuri, V., Nissilä, J., Laurila, J., Karioja, K., Ollila, S., Fabritius, T. and Liedes, T. (2020), Vibration‐Based Monitoring of Gas‐Stirring Intensity in Vacuum Tank Degassing. steel research int., 91: 1900587. doi:10.1002/srin.201900587

Vibration‐based monitoring of gas‐stirring intensity in vacuum tank degassing

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Author: Pylvänäinen, Mika1; Visuri, Ville-Valtteri2; Nissilä, Juhani1;
Organizations: 1Intelligent Machines and Systems, University of Oulu, PO Box 4200, 90014 Oulu, Finland
2Process Metallurgy Research Unit, University of Oulu, PO Box 4300, 90014 Oulu, Finland
3Technical Development, Steelmaking, SSAB Europe Oy, PO Box 93, 92101 Raahe, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2020091469407
Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2020-09-14
Description:

Abstract

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.

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Series: Steel research international
ISSN: 1611-3683
ISSN-E: 1869-344X
ISSN-L: 1611-3683
Volume: 91
Issue: 6
Article number: 1900587
DOI: 10.1002/srin.201900587
OADOI: https://oadoi.org/10.1002/srin.201900587
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Subjects:
Funding: This work was conducted within the Symbiosis of Metal Production and Nature (SYMMET) and DIMECC FLEX research programs funded by Business Finland. V.‐V.V. thanks the Finnish Cultural Foundation and the Walter Ahlström Foundation for financial support. SSAB Europe Oy is gratefully acknowledged for supporting this work.
Copyright information: © 2020 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
  https://creativecommons.org/licenses/by/4.0/