Study of Tundish Slag Entrainment Using Physical Modelling

Michalek, Karel; Gryc, Karel; Socha, Ladislav; Tkadlečková, Markéta; Saternus, M.; Pieprzyca, J.; Merder, T.; Pindor, Lukáš

doi:10.1515/amm-2016-0048

Cited by 19 publications

(11 citation statements)

References 8 publications

(13 reference statements)

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“…To understand the effect of impeller design on the refining process and optimally conduct it in an industrial application, some studies have been done. [5][6][7][8][9][10][11][12][13][14][15][16][17][17][18][19][20][21][22][23][24][25][26][27][28] Visuri et al [20] have given a comprehensive review in hot metal desulfurization and particularly summarized the previous contributions and work in progress on KRs. Song et al [21] conducted a particle image velocimetry (PIV) measurement to investigate the flow pattern induced by a 30-degree pitched paddle impeller for an aluminum-melting furnace.…”

Section: Introductionmentioning

confidence: 99%

Computational Investigation on Effect of Impeller Dimension on Fluid Flow and Interface Behavior for Kanbara Reactor Hot Metal Treatment

Shen

Guo

et al. 2021

steel research int.

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Kanbara Reactor (KR) is widely used for hot metal desulfurization pretreatment in the steelmaking industry. The configuration of its impeller plays a crucial role in the reactor performance, but its function is not fully understood. Herein, a 3D volume of fluid (VOF) model coupled with the sliding mesh technique is developed, and the performance of five impellers with different dimensions is investigated. After the test of grid dependency, the calibration of turbulent models, and the validation via experiments, the numerical model is applied to study the typical developing phenomena and the effect of impeller dimension on the fluid flow characteristics, mixing time, interface profile, and vortex core depth. The results show that the centrifugal discharging flow extruded by the rotating impeller creates a double‐recirculation flow pattern in the axial direction. When the aspect ratio χ of the impeller increases, the upper recirculating region is successively strengthened and enlarged. Furthermore, the mixing time as a function of impeller configuration exists a minimum value. Impeller III is the optimal configuration in the current study. In addition, the relationship between vortex core depth and χ is obtained, and the velocity of the gas–liquid interface increases with the increase in χ.

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Section: Introductionmentioning

confidence: 99%

Computational Investigation on Effect of Impeller Dimension on Fluid Flow and Interface Behavior for Kanbara Reactor Hot Metal Treatment

Shen

Guo

et al. 2021

steel research int.

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“…According to the Třinecké železárny, a.s. suggestions the previous work [18] was focused on studying the problem of slag entrainment risk during heat changes and for installation of different kind of impact pad. Based on the obtained results, casting speed v = 2.5 m· min -1 (model outflow for individual casting strand = 4 dm 3 · min -1 ) was selected.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…Results of such research [8][9][10][11][12][13][14][15][16][17] were discussed in details in article [18]. It can be stated that phenomena of slag entrainment and their risk of creating can be observed and studied the best when the similarity theory is based on Froude criterion: ω -the speed of liquid flow; m· s -1 , g -gravitational acceleration; m· s -2 , l -characteristic dimension; m. the second phase, only in the presence of atmosphere, the critical level of 200 mm for vortex creation was the highest.…”

Section: Introductionmentioning

confidence: 99%

Physical Modelling of Tundish Slag Entrainment under Various Technological Conditions

Michalek¹,

Gryc²,

Socha³

et al. 2017

Archives of Metallurgy and Materials

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This paper deals with the issue of physical modelling of vortexes creation and tundish slag entrainment over the mouth of the nozzle into the individual casting strands. Proper physical model is equivalent to the operational continuous casting machine No. 2 in TŘINECKÉ ŽELEZÁRNY, a.s. Physical modelling methodology and simulated operational conditions are shortly described. Physical modelling was used for the evaluation of current conditions of steel casting at the application of different impact pads in the tundish. Further, laboratory measurement on the physical model aiming the determination of exact critical periods of vortexes creation and study of the slag entrainment as a consequence of changes in surface level during the tundish refilling to standard level were realised. The obtained results were analysed and discussed.

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“…The C-curve method was used to define the characteristics of the steel flow in the tundish under constant (steady) casting conditions [14][15][16]. Upon reaching the desired level in the mold and stabilizing the casting flow rate, a measured amount of aqueous KCl solution was injected into the ladle shroud.…”

Section: The Standard Impact Padmentioning

confidence: 99%

Geometric Modification of the Tundish Impact Point

Buľko

Priesol²,

Demeter

et al. 2018

Metals

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In connection with the increasing requirements for cleanliness in conticast steel, it is necessary to develop original solutions. The tundish, as the last refractory-lined reactor, gives enough space to remove inclusions by optimizing the flow of steel. The basic component of the tundish is the impact pad, the shape of which creates a suitable flow of steel, thus making it part of the tundish metallurgy. The optimal steel flow in the tundish must avoid creating dead zone areas, or the slag “eye” phenomenon in the slag layer around the ladle shroud, and is intended to create conditions for the release of inclusions by promoting reactions at the steel-slag phase interface. The flow also has to prevent excessive erosion of the tundish refractory lining. This paper compares the standard impact pad with the “Spheric” spherical impact pad using computional fluid dynamiscs (CFD) tools and physical modelling. The evaluation criteria are residence time and flow in the tundish at three different casting speeds.

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Study of Tundish Slag Entrainment Using Physical Modelling

Cited by 19 publications

References 8 publications

Computational Investigation on Effect of Impeller Dimension on Fluid Flow and Interface Behavior for Kanbara Reactor Hot Metal Treatment

Computational Investigation on Effect of Impeller Dimension on Fluid Flow and Interface Behavior for Kanbara Reactor Hot Metal Treatment

Physical Modelling of Tundish Slag Entrainment under Various Technological Conditions

Geometric Modification of the Tundish Impact Point

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