Coil Design in Electromagnetic Induction-controlled Automated Steel-teeming System and Its Effects on System Reliability

Liu, Xingan; Wang, Qiang; Li, Dejun; Li, Guanlin; Geng, Duyan; Gao, Ao; He, Jicheng

doi:10.2355/isijinternational.54.482

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…Edge-induction-heating technology was developed using electromagnetic theory and the thermal effect of current as a basic principle. [3] It has been widely used in steel production processes owing to its high heating rate, high heating efficiency, environmental protection, and easy automation, [4,5] such as electromagnetic steelteeming technology, [6,7] induction-heating tundish, [8,9] materials heat treatment, [10,11] and strip edge temperature compensation. [12,13] The Joule heat generated by eddy currents can effectively alleviate the problem of uneven transverse temperature distribution caused by the rapid drop in edge temperature.…”

Section: Introductionmentioning

confidence: 99%

Transverse Thermal Behavior of a Hot‐Rolled Strip During the Edge‐Induction‐Heating Process

Wen

Zhang

et al. 2023

steel research int.

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To obtain the transverse temperature distribution of running strips under C‐type edge induction heaters during the hot‐rolling process, a coupled electromagnetic–thermal finite‐element model is established using COMSOL, in which the electromagnetic and temperature distributions regularity with various process parameters are systematically obtained. It is shown in the results that the temperature increase is directly proportional to the frequency and current and inversely proportional to the thickness. Meanwhile, the edge temperature drop can be rapidly compensated for using an edge heater, but it also leads to the appearance of a “cat‐ear” high‐temperature zone at the edge; thus, the transverse temperature uniformity cannot be guaranteed. To improve the temperature uniformity of the running strip, a magnetic shield plate is designed to weaken the effect of the cat ear, and the effects of the size and installation position of the shielding plate on the temperature distribution are analyzed. The standard deviation and uniformity of the temperature are used to determine the uniformity of the transverse temperature, and the optimal parameter combination mode of the magnetic shielding amounts is obtained, which can provide a reference for optimizing the heating process at the edge of the strip under moving conditions.

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Section: Introductionmentioning

confidence: 99%

Transverse Thermal Behavior of a Hot‐Rolled Strip During the Edge‐Induction‐Heating Process

Wen

Zhang

et al. 2023

steel research int.

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“…Wang et al (2015) and Li et al (2012) established a thermal experimental setup to investigate the impact of the power parameters, coil position and nozzle material on the electromagnetic steel teeming process. After implementing the EICAST system, Liu et al (2014) evaluated the temperature and equivalent stress distributions during the thermal cycle process to assess the safety and reliability of ladle. Because the length and installation position of the coil were directly impacted by the blocking layer, the influence of the liquid steel refining temperature and refining time on the blocking layer were explored, and a control scheme of the blocking layer by regulating Fe-C alloy composition was provided (He et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

A model to predict coil temperature evolution during the whole thermal cycle process of ladle with a novel steel teeming technology

WANG

et al. 2022

JTST

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Electromagnetic induction controlled automated steel teeming (EICAST) is a ladle-sand-free technology applied to the steel teeming process for clean steel practice. The temperature of the induction coil in the EICAST system greatly influence its service life. In this paper, a numerical model was developed to predict the temperature evolution of the induction coil without or with a nano thermal insulation felt (WDS) during the whole thermal cycle of ladle. Industrial experiment was conducted for the model validation. The results indicate that WDS reduces the coil temperature at the ladle baking and secondary refining stages, however it causes a rapid jump in the coil temperature from 309°C to 707°C during the induction heating process. Because the coil temperature is high enough compared to its ambient temperature after the induction heating stage, the temperature of the induction coil using WDS heat insulation material drops to 461°C constantly at the steel teeming stage. The measured temperatures of the nozzle brick and coil in the industrial experiment correspond well with the calculated ones by numerical simulation. The developed model could be used to predict the coil temperature evolution and improve coil cooling strategy at each stage of the whole thermal cycle process of ladle for the industrial application.

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“…The safety and reliability of the coil inserted inside the nozzle brick had been thoroughly studied in the research of an electromagnetic induction controlled automated steel teeming (EICAST) technology. [ 23 ] And its temperature could be kept in a low range by the heat insulation and air‐mist cooling. [ 24,25 ] Direct current (DC) is applied to produce a static electromagnetic field near the nozzle.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Design of Vortex Suppression Utilizing Static Electromagnetic Field during Steel Teeming from Ladle

Zhao

et al. 2022

steel research int.

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Vortex slag entrapment during ladle teeming process causes liquid steel pollution, nozzle clogging, etc. Tangential velocity of molten steel is directly related to the vortex. Herein, the tangential velocity is reduced by the electromagnetic force generated by the interaction between a static electromagnetic field and the molten steel. Through the multiphysical field simulation, influences of the electromagnetic parameter, coil structure, coil position, and ladle structure on the vortex are investigated. Results demonstrate that magnetic induction intensity is proportional to the coil ampere‐turns, thereby affecting the vortex suppression. The action region of the static electromagnetic field expands when the coil diameter increases from 180 to 360 mm; it is beneficial to reduce the vortex critical height by 37.9%. The reduction of the distance between the coil and the molten steel also promotes the vortex suppression. The coil misalignment is beneficial to fully utilize the electromagnetic field; the critical height is reduced by 15%. The tangential velocity is changed when the nozzle diameter and eccentricity are optimized, and the vortex suppression will be amplified by using the electromagnetic field. This study provides the theoretical guidance for the optimizing design of the vortex suppression utilizing the static electromagnetic field.

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Coil Design in Electromagnetic Induction-controlled Automated Steel-teeming System and Its Effects on System Reliability

Cited by 8 publications

References 14 publications

Transverse Thermal Behavior of a Hot‐Rolled Strip During the Edge‐Induction‐Heating Process

Transverse Thermal Behavior of a Hot‐Rolled Strip During the Edge‐Induction‐Heating Process

A model to predict coil temperature evolution during the whole thermal cycle process of ladle with a novel steel teeming technology

Optimizing Design of Vortex Suppression Utilizing Static Electromagnetic Field during Steel Teeming from Ladle

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