Electrovortex field in DC arc steelmaking furnaces with bottom electrode

Kazak, Oleg; Semko, A. N.

doi:10.1179/1743281210y.0000000006

Cited by 12 publications

(12 citation statements)

References 3 publications

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“…The comparison of the obtained results by different software packages and methods showed an insignificant difference of ,3%. [11][12][13][14][15] The similarity of the calculations performed by different methods and software packages confirms the reliability of the methods and significance of the results.…”

Section: Verification Of Obtained Resultssupporting

confidence: 61%

“…The results of the calculations show the fact that the Lorentz force in such furnaces is essential for the appearance of EVF. 11,12 The velocity field for isothermal formulation, when the power is insignificant and only compensates losses through the refractory based on the obtained results of electromagnetic force, was calculated in a previous publication. 13 The calculations were carried out in both 2D and 3D formulation.…”

Section: Results Of Solution and Discussionmentioning

confidence: 99%

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Modelling of electrovortex and heat flows in dc arc furnaces with bottom electrode

Kazak

Semko

2013

Ironmaking & Steelmaking

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The article is devoted to the investigation of interaction between electrovortex and heat flows of liquid metal in dc arc furnaces with a bottom electrode. A mathematical model of liquid steel flows in a dc arc furnace with a bottom electrode was developed, and an algorithm of a three-stage solution was produced based on standard software packages. The results of electromagnetic, heat transfer and hydrodynamic analysis in industrial dc arc furnaces are given. It is shown that the Lorentz force makes up ,30% of the volumetric gravity force and makes the main contribution to vortex flow of liquid metal in a dc arc furnace. The convection flows with the maximum heat power of furnace make a significant contribution to the vortex flow of liquid metal, and the maximum value of the vortex flow velocity is ,1?5 times more than the movement without convection. The verification of results has been carried out by comparing them with general electrovortex flows theory, experimental data and results of similar software packages.

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Section: Verification Of Obtained Resultssupporting

confidence: 61%

Section: Results Of Solution and Discussionmentioning

confidence: 99%

Modelling of electrovortex and heat flows in dc arc furnaces with bottom electrode

Kazak

Semko

2013

Ironmaking & Steelmaking

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“…The study done by Wang et al 1,2) indicated that convection and radiation heat transfer mechanisms are responsible for heating and melting iron scrap in the steelmaking process. Kazak et al [3][4][5][6] concluded that the Lorenz force had the major effect on the origination of the vortex motion of a melt in bottom electrode direct current (DC) EAF.…”

Section: Introductionmentioning

confidence: 99%

Computational Simulation Model for Metallurgical Effects during EAF Refining Stage: Waiting and Arcing Time

Elkoumy¹,

El-Anwar

Fathy³

et al. 2018

ISIJ International

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3D computational fluid dynamics models using Fluent were developed to investigate the steel melt flow during waiting and arcing time. Both models were transient that analyzed 60 seconds to investigate the flow characteristics considering variation in steel melt thermo-physical parameters and operating conditions. The velocity of melt movement was high enough to make a turbulent flow (solved with realize k-ε turbulence model). It was found that the steel melt flow velocity increases by a combined effect of the steel melt temperature and composition, and slag pressure. The slag pressure increases by a double effect of slag density and height, and the steel melt fluid flow velocity changes with the slag pressure. The effect of the slag thickness is more significant than the effect of thermo-physical properties of steel melt. Although, the maximum steel melt velocity "during arcing time" may be as large as 0.67 m/s located at steel met outlet, the melt exhibits completely dead zones with minimum flow velocity distribution especially at the bottom and circumference areas. This indicates the importance of combined stirring and large reaction rates to achieve a complete homogeneous melt especially at bottom and circumference areas.

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“…The preliminary analysis provided the optimal division into elements, as well as their form [13][14][15]. The domain area was split into elements unevenly: in the area of the electrodes and boundary with the fettle, where large gradients of all the parameters are situated, the elements were densely located and were of a small size, approximately 0.01 of the electrode radius.…”

Section: A Model Of An Industrial Furnacementioning

confidence: 99%

Rotor Lorentz force as a parameter for the estimation of vortex flows in a DC electric arc furnace with different bottom electrode positions

Nedopekin

Semko

Kazak

2017

Ironmaking & Steelmaking

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This article is devoted to researching a simple parameter which can predict the electrovortex flow in a liquid conductor under a Lorentz force. This is provided by a numerical simulation of the electrovortex and convection flows in a DC electric arc furnace with the bottom electrode in different positions. The electromagnetic, temperature and hydrodynamic distribution parameters are given. It is shown that lifting the bottom electrode above the fettle surface by the electrode radius leads to the decrease of shear stress on the fettle area by 30%, while putting the bottom electrode lower than the fettle surface by a distance equal to the electrode radius and its expansion by the same distance reduces stress by 10%. A good correlation between the shear stress on the fettle area and a rotor Lorentz force provide possibility to use rotor Lorentz force as a simple electromagnetic parameter for the estimation of the vortex flow influence on the increased wearing of the fettle.

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Electrovortex field in DC arc steelmaking furnaces with bottom electrode

Cited by 12 publications

References 3 publications

Modelling of electrovortex and heat flows in dc arc furnaces with bottom electrode

Modelling of electrovortex and heat flows in dc arc furnaces with bottom electrode

Computational Simulation Model for Metallurgical Effects during EAF Refining Stage: Waiting and Arcing Time

Rotor Lorentz force as a parameter for the estimation of vortex flows in a DC electric arc furnace with different bottom electrode positions

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