Effect of flow modifiers on liquid metal cleanliness in four-strand delta shaped billet caster tundish

Chattopadhyay, Kinnor; Isac, Mihaiela; Guthrie, R. I. L.

doi:10.1179/1743281212y.0000000003

Cited by 20 publications

(23 citation statements)

References 23 publications

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“…Por questões de escala, a flotação de macroinclusões (%( ≈ ) não pode ser analisada adequadamente pela Figura 3. A Figura 4 apresenta uma nova curva nível para a equação (9) dando ênfase à região de inclusões de tamanho grande (≈100-120µm) [18]. O comportamento das configurações de distribuidor em relação à passagem de inclusões não-metálicas grandes para o molde é diferente daquele para inclusões médias.…”

Section: Limpidez Do Açounclassified

Discussão Sobre O Conceito De Curto-Circuito Aplicado À Análise Do Escoamento De Distribuidores Para Lingotamento Contínuo

Braga¹,

Barral²,

Costa³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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ResumoO curto-circuito é um dos componentes dos modelos de compartimentos utilizados na análise das curvas de Distribuição de Tempos de Residência (DTR) de distribuidores para lingotamento contínuo. Foram identificados na literatura, no entanto, diversos exemplos de seu emprego incorreto. O presente trabalho discute a interpretação física do curto-circuito, as formas de sua quantificação e as consequências nocivas de sua presença sobre a limpidez do aço e o controle da temperatura do aço no molde. Mostra-se que o método de cálculo dos parâmetros dos modelos de compartimentos deve ser alterado caso haja curto-circuito no distribuidor. É constatado que o curto-circuito deve ser evitado durante o projeto de distribuidores destinados à fabricação de aços limpos devido ao risco de perdas metálicas por macroinclusões. Palavras-chave: Distribuidor; Curva DTR; Curto-circuito; Aço limpo. DISCUSSION ABOUT THE CONCEPT OF SHORT CIRCUIT APPLIED TO FLOW ANALYSIS OF CONTINUOUS CASTING TUNDISHES AbstractShort circuit is one of components of compartment models used in the analysis of Residence Time Distribution (RTD) curves of continuous casting tundishes. It has been identified in the literature, however, several examples of misunderstandings regarding its use. This work discusses the physical interpretation of short circuit, the ways of its quantification and the harmful consequences of its presence on steel cleanness and steel temperature control in the mould. It is shown that the method of calculating parameters of compartment models must be changed if there is a short circuit in the tundish. It is pointed out that the short circuit should be avoided during the tundish design for clean steels producing due to the risk of metal losses by macroinclusions.

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Section: Limpidez Do Açounclassified

Discussão Sobre O Conceito De Curto-Circuito Aplicado À Análise Do Escoamento De Distribuidores Para Lingotamento Contínuo

Braga¹,

Barral²,

Costa³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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“…As the last refractory reactor, the tundish plays important roles in refining and distributing molten steel to the continuous casting mold. In order to realize such an aim, many flow control devices, such as weirs, dams, impact pads, gas curtains, baffle wall, and turbulence inhibitors have been applied to change the fluid flow, and heat and mass transfer in the tundish [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Metals 2019, 9, x FOR PEER REVIEW 2 of 16 (2) Numerical simulation is a more and more popular method to have a deep insight into the metallurgical phenomena because it can give detailed information about the metallurgical process [11][12][13][14][15][16][17][18][19][20]. But some assumptions are applied in the mathematical model in order to simplify the governing equations.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Symmetric Transfer Behavior in an Asymmetric Two-Strand Tundish with Different Turbulence Inhibitor

Yang

Lei

Zhao

et al. 2019

Metals

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The task of the tundish is to supply and distribute the molten steel with the similar temperature and the similar inclusion mass concentration to the continuous casting mold. But it is difficult for the asymmetric tundish to accomplish this task. Thus, the scheme about the asymmetric turbulence inhibitor and the baffle wall with guided holes is proposed to optimize the tundish. In order to have a deep insight into the metallurgical behavior in the asymmetric tundish, numerical simulation is applied to describe the fluid flow, the heat transfer, RTD (residence time distribution) curve, and inclusion collision aggregation behavior. Numerical results show that the predicted temperature and inclusion concentration agree with the industrial experimental data. In the asymmetric two-strand tundish, the asymmetric turbulence inhibitor and the baffle wall with guided holes can extend the mean residence time at the left outlet, reduce the temperature difference between the two outlets, and prompt the inclusion removal rate at the left outlet.

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“…A. Tripathi et al [7] studied the effect of the shape of tundish and FCDs on the fluid flow characteristics in three different industrial six strand billet caster tundishes by mathematical simulation. K. Chattopadhyay et al [8] used mathematical simulation and water modeling to study the effect of flow modifiers on liquid metal cleanliness in a four-strand delta shaped billet caster tundish. T. Merder et al [9] designed and compared three baffles for a six-strand delta-shaped continuous casting tundish by mathematical simulation, and the research study used industrial experiments to validate numerical simulation in an industrial tundish.…”

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confidence: 99%

Optimization of flow control devices for a T-type five-strand billet caster tundish: water modeling and numerical simulation

Zhang

2016

China Foundry

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In continuous casting, the tundish is an important intermediate vessel between the ladle and the mould. It not only is used as a reservoir and distributor, keeping the static pressure of liquid steel stable, but also it is used as a reactor to produce clean steel [1,2] .The important role of tundish metallurgy is to promote the floatation and removal of nonmetallic inclusions and the homogenization of liquid steel temperature and composition in tundish. The transmission of substance and energy are determined by the flow characteristics of liquid steel in the tundish [3] . It is very important to study the flow characteristics of liquid steel, and the reasonable flow control devices (FCDs) are an important guarantee to obtain the ideal flow characteristic.The T-type five-strand billet caster tundish is a kind of multi-strand tundish. Compared with single-strand and two-strand tundish, the rule of fluid flow in a multistrand tundish is more complicated and many problems Abstract: The optimization of flow control devices (FCDs) for a T-type five-strand billet caster tundish was carried out by water modeling and numerical simulation. In water modeling experiments, flow characteristics of the bare tundish and tundish configurations with designed U-type baffles and a round turbulence inhibitor were analyzed using residence time distribution (RTD) curves. Mathematical models for liquid steel in the real plant tundish were established using the fluid dynamics software package Fluent. The flow field, the temperature field, and the RTD curves of liquid steel in the proposed tundish configurations were obtained. The results of numerical simulation and water modeling were validated with each other by the predicted and experimental RTD curves. The results of flow field and temperature field were used to reflect the actual state of a real plant tundish and to choose the optimal FCD. Finally, from the whole performance of the multi-strand tundish, the optimal scheme was determined by combining the results of water modeling and numerical simulation. With the optimal tundish equipped with U-type baffle with deflector holes and round turbulence inhibitor, not only was the flow characteristic of each strand improved, but also the difference of flow characteristics between multiple strands was smaller.

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Effect of flow modifiers on liquid metal cleanliness in four-strand delta shaped billet caster tundish

Cited by 20 publications

References 23 publications

Discussão Sobre O Conceito De Curto-Circuito Aplicado À Análise Do Escoamento De Distribuidores Para Lingotamento Contínuo

Discussão Sobre O Conceito De Curto-Circuito Aplicado À Análise Do Escoamento De Distribuidores Para Lingotamento Contínuo

Quasi-Symmetric Transfer Behavior in an Asymmetric Two-Strand Tundish with Different Turbulence Inhibitor

Optimization of flow control devices for a T-type five-strand billet caster tundish: water modeling and numerical simulation

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