Kettlor: efficient stirring in ladle metallurgy

Burty, M.; Pusse, C.; Bertoletti, C.; Wetta, P.; Cariola, E.

doi:10.1051/metal:2006128

Cited by 11 publications

(14 citation statements)

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“…[2,4] Efforts are underway to detect ladle wall vibration due to gas injection to explain the level of agitation inside. [5][6][7][8][9][10][11][12][13][14][15][16] Mucciardi [17] used an accelerometer to measure ladle vibration due to stirring to correlate the mixing power and vibration signal. He reported that an accelerometer is a viable transducer for controlling the interaction between liquids and gases when direct contact with the liquid phase is not practical.…”

Section: Introductionmentioning

confidence: 99%

Study of Low Flow Rate Ladle Bottom Gas Stirring Using Triaxial Vibration Signals

Yenus

Brooks

Dunn

et al. 2017

Metall Mater Trans B

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Section: Introductionmentioning

confidence: 99%

Study of Low Flow Rate Ladle Bottom Gas Stirring Using Triaxial Vibration Signals

Yenus

Brooks

Dunn

et al. 2017

Metall Mater Trans B

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“…A topic for future work would be to study the frequency spectrum content of the ladle vibration in more detail to identify the frequency bandwidth that has a better correlation with the gas flow rate, and consequently with the gas‐stirring intensity. In addition, possible nonlinear relationships between the gas flow rate and vibration intensity could be investigated. Finally, a closer look would also be taken at the possible relationship between the LRV and the number of stirrings after the ladle relining, and to improve the coefficient of determination by modifying the LRV and including more explanatory variables in the model.…”

Section: Resultsmentioning

confidence: 99%

“…The main tasks of ladle treatments in steelmaking meltshop are alloying, deoxidation, degassing, and heating of steel. As steelmakers strive to reduce variance in composition and temperature as well as improve energy use and yields, various methods, including vibration, optical, and acoustic measurements, have been proposed for indirect measurements.…”

Section: Introductionmentioning

confidence: 99%

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Vibration‐Based Monitoring of Gas‐Stirring Intensity in Vacuum Tank Degassing

Pylvänäinen

Visuri

Nissilä

et al. 2020

steel research int.

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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.

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“…Several studies have been performed on the vibration measurements of laboratory and industrial ladles. Burty et al [5,6] studied advanced technique for ladle stirring monitoring, including vibrations sensors and derived an optimal vibration range to monitor the inclusion removal rate. Behera et al [7] implemented a stirring control system, which is based on the measurements of vibrations, and concluded that a vibration-based monitoring of the ladle furnace enabled a reduction of 20% and 10% in argon gas and aluminum consumption, respectively.…”

Section: Introductionmentioning

confidence: 99%

Vibrations of a laboratory-scale gas-stirred ladle with two eccentric nozzles and multiple sensors

Alia

Pylvänäinen

Visuri

et al. 2019

J. Iron Steel Res. Int.

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During ladle stirring, a gas is injected into the steel bath to generate a mixing of the liquid steel. The optimal process control requires a reliable measurement of the stirring intensity, for which the induced ladle wall vibrations have proved to be a potential indicator. An experimental cold water ladle with two eccentric nozzles and eight mono-axial accelerometers was thus investigated to measure the vibrations. The effect of the sensors' positions with respect to the gas plugs on the vibration intensity was analyzed, and experimental data on several points of the ladle were collected for future numerical simulations. It is shown that the vibration root-mean-square values depend not only on process parameters, such as gas flow rate, water, and oil heights, but also on the radial and axial positions of the sensors. The vibration intensity is clearly higher, close to the gas plumes, than in the opposite side. If one of the nozzles is clogged, the vibration intensity close to the clogged nozzle drops drastically (À 36 to À 59%), while the vibrations close to the normal operating nozzle are hardly affected. Based on these results, guidelines are provided for an optimized vibration-based stirring.

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Kettlor: efficient stirring in ladle metallurgy

Cited by 11 publications

References 0 publications

Study of Low Flow Rate Ladle Bottom Gas Stirring Using Triaxial Vibration Signals

Study of Low Flow Rate Ladle Bottom Gas Stirring Using Triaxial Vibration Signals

Vibration‐Based Monitoring of Gas‐Stirring Intensity in Vacuum Tank Degassing

Vibrations of a laboratory-scale gas-stirred ladle with two eccentric nozzles and multiple sensors

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