Electromagnetic visualisation of steel flow in continuous casting nozzles

Higson, S. R.; Drake, Pat; Lyons, Anthony R. A.; Peyton, A. J.; Lionheart, William R B

doi:10.1179/174328106x149897

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…MIT has been used to study two-phase molten steeleargon flows that occur in the submerged entry nozzle, which is used to transport liquid steel into the mould. Laboratory (Ma, Peyton, Binns, & Higson, 2005) and plant (Higson, Drake, Lyons, Peyton, & Lionheart, 2006) studies have shown that cross-section images of the phase fraction can be obtained under the harsh operating conditions with very high temperatures. CIFT has been demonstrated in a laboratory environment on a tenth-scale laboratory model of the continuous casting process using the room-temperature liquid metal, InGaSn (Stefani et al, 2004).…”

Section: Hot Metal Processingmentioning

confidence: 98%

Electromagnetic induction tomography

Peyton

2015

Industrial Tomography

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Section: Hot Metal Processingmentioning

confidence: 98%

Electromagnetic induction tomography

Peyton

2015

Industrial Tomography

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“…Electromagnetic inductance tomography (EMT) [6] presents an attractive tool to visualize the steel fraction within the SEN. In general, EMT uses inductive coupling between sensors to provide images that represent the distributions of electrically conductive and/or magnetically permeable material within the object space.…”

Section: Introductionmentioning

confidence: 99%

Use of electromagnetic induction tomography for monitoring liquid metal/gas flow regimes on a model of an industrial steel caster

Terzija

Yin

Gerbeth

et al. 2010

Meas. Sci. Technol.

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Monitoring of the steel flow through the submerged entry nozzle (SEN) during continuous casting presents a challenge for the instrumentation system because of the high temperature environment and the limited access to the nozzle in between the tundish and the mould. Electromagnetic inductance tomography (EMT) presents an attractive tool to visualize the steel flow profile within the SEN. In this paper, we investigate various flow regimes over a range of stopper positions and gas volume flow rates on a model of a submerged entry nozzle. A scaled (approximately 10:1) experimental rig consisting of a tundish, stopper rod, nozzle and mould was used. Argon gas was injected through the centre of the stopper rod and the behaviour of the two-phase GaInSn/argon flow was studied. The experiments were performed with GaInSn as an analogue for liquid steel, because it has similar conductive properties as molten steel and allows measurements at room temperature. The electromagnetic system used in our experiments to monitor the behaviour of the two-phase GaInSn/argon flow consisted of an array of eight equally spaced induction coils arranged around the object, a data acquisition system and a host computer. The present system operates with a sinusoidal excitation waveform with a frequency of 40 kHz and the system has a capture rate of 40 frames per second. The results show the ability of the system to distinguish the different flow regimes and to detect the individual bubbles. Sample tomographic images given in the paper clearly illustrate the different flow regimes.

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“…This work will focus on the influence of the wall contact angle and roughness as the influence of the contact angle on the structure of the two phase flow has already been shown by . Hints towards a large gas volume near the refractory walls are as well given by …”

Section: Discussionmentioning

confidence: 99%

Low Pressure Effects in SEN‐Stopper Region in Continuous Casting

Thumfart

Javurek

2014

steel research int.

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In the continuous casting of steel, the control of the flow to the mould is a critical issue as a constant mould level is essential for a good quality of the cast product. A stopper rod is a commonly used device to control the flow rate. Agglomeration of solid material near the stopper rod can lead to a reduced cross section and thus to a decreased casting speed or even total blockage (clogging). The mechanisms involved in clogging are still not fully understood. Single phase considerations of the flow in the region of the stopper rod result in a low or even negative pressure at the smallest cross-section. This can cause degassing of dissolved gases from the melt, evaporation of alloys and entrainment of air through the refractory material. In this paper the criteria for degassing of liquid steel at low pressures are analyzed and compared with water. A mathematical model for a two phase flow situation (liquid steel/gas) in the SEN that links the pressure distribution and the throughput with the geometrical parameters, the amount of gas in the SEN and the pressure loss coefficient at the stopper rod is presented. An explanation theory for the diminishing influence of the gas injection on clogging is outlined.

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Electromagnetic visualisation of steel flow in continuous casting nozzles

Cited by 11 publications

References 3 publications

Electromagnetic induction tomography

Electromagnetic induction tomography

Use of electromagnetic induction tomography for monitoring liquid metal/gas flow regimes on a model of an industrial steel caster

Low Pressure Effects in SEN‐Stopper Region in Continuous Casting

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