Investigation of decarburization behavior in RH-reactor and its operation improvement.

Kuwabara, Tatsuro; Umezawa, Kazusige; Mori, Kouji; Watanabe, Hisashi

doi:10.2355/isijinternational1966.28.305

Cited by 126 publications

(90 citation statements)

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“…Vários pesquisadores [1][2][3], entre outros ressaltam que a cinética destas reações, são afetadas principalmente pela taxa de circulação do aço entre a câmara de vácuo e a panela. Salientam que a taxa de circulação depende da vazão de argônio, posicionamento e configuração dos bicos de injeção de argônio; número, comprimento, diâmetro interno e formato das pernas; pressão na câmara de vácuo.…”

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Simulação Numérica Do Fluxo Recirculatório Em Um Reator Rh: Aplicação À Dessulfuração

Silva¹,

Rodrigues²,

Soares³

et al. 2017

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

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ResumoForam realizadas simulações numéricas, utilizando Computational Fluid Dynamics, para determinar o comportamento fluidodinâmico em condições isotérmicas de metal e gás no interior de um reator RH. São estudados os efeitos da taxa de injeção de gás sobre a distribuição espacial de gás, taxa de circulação e campo de velocidade no sistema. Analisa-se, a partir dos dados de simulação, os resultados de uma operação industrial de dessulfuração por adição de reagentes na câmara de vácuo. Palavras-chave: Reator RH; Modelagem; Dessulfuração. NUMERICAL SIMULATION OF RECIRCULATING FLOW IN RH REACTOR: APPLICATION TO DESULFURIZATION AbstractComputational Fluid Dynamics has been applied in order to describe the flow of gas and metal inside a RH reactor. The effects of gas injection on gaseous spatial distribution, steel circulation rate and flow field inside the ladle, snorkels and vacuum camera have been assessed. Data from this simulation were used for analyzing the results of a desulfurization trial performed by addition of reagents inside the vacuum camera.

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“…De acordo com Kuwabara [2] Q ton min ⁄ = 114 G / d / ln P P / ~113 Q = taxa de circulação (ton/min); d = diâmetro das pernas (m); G = taxa de injeção de gás (Nm 3 /min); P 1 = pressão na câmara de vácuo; P 2 = pressão de injeção. Enquanto que, Seshadri e Costa [4] apontam que:…”

Section: -Introduçãounclassified

Simulação Numérica Do Fluxo Recirculatório Em Um Reator Rh: Aplicação À Dessulfuração

Silva¹,

Rodrigues²,

Soares³

et al. 2017

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

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“…Conversely, the dependencyof decarburization rate on_ the pressure in the chamber is small with less than lOppm of carbon. (3) As the influence of the sulphur content on the decarburization rate is small with a carbon content of more than 10 …”

Section: Effect Of [S]mentioning

confidence: 99%

Decarburization Reaction in Ultra-low Carbon Iron Melt under Reduced Pressure.

et al. 1993

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The kinetics of the decarburization reaction with dissolved oxygen in a liquid iron in the ultra-low carbon concenttation range under reduced pressure have been studied, using an induction furnace with a 20kg melt, The results obtained are as follows:(1 ) The decarburization reaction proceeds to less than 5ppm of carbon, and the decarburization rate constant, K, decreases as the carbon content decreases. (2) As the pressure in the chamberdecreases, the decarburization rate increases with a carbon content of more than 10 ppm. On the other hand, the dependencyof decarburization rate on the pressure in the chamber is small, with less than 10ppm of carbon. The influence of the sulphur content on the decarburization rate is small with a carbon content of more than IOppm. The decarburization rates are not affected by the mass transfer of CO in the gas phase under experimental conditions. Thus, it is concluded that the decarburization rate is controlled by the mass transfer of carbon in liquid iron. (4) The fact that the decarburization rate at a carbon content of more than 10ppm is affected by the total pressure of the chamberhas been explained by the change in interfacial area of the reaction between the gas and liquid phases resulting from CO boiling in the bulk melt. (5) The decrease in the decarburization rate in the ultra-low carbon concentfation range in RH is also caused by the decrease in interfacia[ area of the reaction between the gas and liquid phases.KEY WORDS: kinetics; decarburization; molten iron; ultra-low carbon steel; RH degassing. Metal samples were taken by quartz tubes for analysis of [C] and [O]. Other compositions ([Si], [Mn], [P] and [S]) were analyzed and were found to be constant during experiments. The analytical method of carbon was combustion-infrared absorptiometry by electro resistance furnace. Type EMIA-U511 was used for this analysis. Samples were always cleaned by electropolishing before the analysis. Sucrose (C12H22011) was used as a standard reagent. In this paper, taking into account the accuracy of analysis of carbon, the decarburization reaction with a carbon content of more than 5 ppm will be discussed.Other experimental conditions are shown in Table 1. In some experiments, Ar gas was blown onto the melt surface. In other experiment. Ar gas bubbling i•nto the melt was performed. 1O ppm).of the melt was observed at all the surface of the melt, as shown in Fig. 2a). When carbon content decreased by 20~~O ppm, the evolution of CO bubbles was observed only at the interface between the crucible and the melt (Fig. 2b)). When carbon content decreased by less than lOppm (approximately lOmin after the start), the evolution of CO bubbles was not observed and hence, the surface of the melt became quiet (Fig. 2c)) . Figure 3 shows the typical changes in [C] and [O] (Fig. 2b)). At [C]

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“…Kuwabara et al 2) proposed empirical equations to predict the molten steel circulation. From water model experiments, 1,2) several empirical equations have been proposed to predict the circulation flow rate. However, there is limitation in their applicability to a real RH system due to the large difference between the conditions of the water model and the real system.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rotating Magnetic Field on Two-phase Flow in RH Vacuum Degassing Vessel

Li¹,

Tsukihashi²

2005

ISIJ Int.

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Rotating magnetic field is applied in up-leg of RH vessel to promote the removal of non-metallic inclusions of molten steel and to prolong the life of RH equipment. Physical and mathematical models have been developed to understand the two-phase turbulent flow considering the effect of the rotating magnetic field in the RH vacuum degassing vessel. Water model experiments verified that the gas bubbles can be moved toward the central zone of up-leg of RH vessel as the result of density difference between gas bubbles and liquid in the swirling flow. The larger circulation flow rate can be obtained in RH degassing vessel with the effect of swirling flow. A penetrating velocity, which does not change the equation characteristics but changes solution distribution, is proposed to revise the gas volume fraction conservation equation. A revised gas volume fraction conservation equation is successfully used to solve the gas distribution in RH vessel. If there is no swirling flow, the larger upward velocities and maximum of the gas volume fraction appear near wall of up-leg. If the rotating magnetic field is applied in up-leg, the larger upward velocities occur in the central zone of up-leg. These phenomena agree with the experimental observation. When the rotating electromagnetic force is applied, the numerical results showed that a swirling flow may be produced and extended into the vacuum chamber. As the occurrence of swirling flow in upper part of up-leg, the maximum of gas volume fraction moves toward the center zone of up-leg and the upward parabolic velocity distribution is also formed.

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Investigation of decarburization behavior in RH-reactor and its operation improvement.

Cited by 126 publications

References 0 publications

Simulação Numérica Do Fluxo Recirculatório Em Um Reator Rh: Aplicação À Dessulfuração

Simulação Numérica Do Fluxo Recirculatório Em Um Reator Rh: Aplicação À Dessulfuração

Decarburization Reaction in Ultra-low Carbon Iron Melt under Reduced Pressure.

Effect of Rotating Magnetic Field on Two-phase Flow in RH Vacuum Degassing Vessel

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