Vibration‐Based Monitoring of Gas‐Stirring Intensity in Vacuum Tank Degassing,Steel Research International

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Vibration‐Based Monitoring of Gas‐Stirring Intensity in Vacuum Tank Degassing
Steel Research International ( IF 1.9 ) Pub Date : 2020-03-16 , DOI: 10.1002/srin.201900587
Mika Pylvänäinen ₁ , Ville-Valtteri Visuri ₂ , Juhani Nissilä ₁ , Jouni Laurila ₁ , Konsta Karioja ₁ , Seppo Ollila ₃ , Timo Fabritius ₂ , Toni Liedes ₁

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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.

中文翻译：

基于振动的真空罐脱气中气体搅拌强度的监测

通常在真空罐中使用注入氩气的方式搅拌液态钢，以实现均匀的成分和高纯度钢。这项工作的目的是研究容器振动对真空罐脱气机中气体搅拌的运行状态监控的影响。经过对振动特征的广泛分析，发现垂直速度的均方根（RMS）是测量由钢包中的气体注入量引起的搅拌强度的最佳特征。使用中心长度为21 s的中值滤波器进行平滑。在这项工作中，使用钢包响应值（LRV）描述了气体搅拌的运行状态监控。这描述了钢包以最小量的氩气产生最大量的振动的能力。每个钢包的LRV汇总显示了它们之间的显着差异。相应地，钢包响应度值（rLRV）用于在线监测可能的气体泄漏。rLRV还可以用于在线监测搅拌效率，并将其与特定钢包或所有钢包的整体效率进行比较。

更新日期：2020-03-16

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