Kinetics for reaction of low-carbon steel melts with CO−CO2 gas mixtures using nonlinear rate equations

Susa, Masahiro; Nagata, Kazuhiro

doi:10.1007/bf02654101

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…T. Kuwabara et al 4) proposed a reaction zone model and evaluated first the decarburization in the bulk of molten steel by experiment-taking sample in the up-leg and the down-leg in vacuum, and the circulation flow rate. M. Susa and K. Nagata 5) analyzed the transfer reaction of the carbon and the oxygen from the surface to the molten steel, coupling of the chemical reaction, the carbon and the oxygen diffusion were taken into account within the diffusion layer in the molten steel in order to explain the change of the concentrations in molten steel. And some other mathematical models simulating the decarburization reaction in the RHdegasser have been developed.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model for Decarburization Process in RH Refining Process

et al. 2014

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A three-dimensional mathematical model for natural decarburization process of ultra-low carbon Al killed steel during RH refining has been established. The decarburization behavior in RH degasser was discussed on the basis of a comparison between simulation data and the actual plant trials ones. The effects of the different initial carbon content, initial oxygen content, the lift gas rate and inside diameter on decarburization were investigated. The results showed that when the dissolved oxygen concentration was 0.08% in the molten steel, the flow rate of gas injected through the up-leg was 120 Nm 3 /h, the inside diameter of up and down-leg was 650 mm, under these conditions, the initial carbon content was 0.03%, 0.023% and 0.015%, respectively, after about 25 minute, the average carbon content in molten steel was 0.011%, 0.01% and 0.0008%. The final dissolved carbon content is related to the initial dissolved oxygen content in molten steel. The average carbon concentration and the decarburization rate of the molten steel will decrease with the increasing of the initial dissolved oxygen content. The effects of different inside diameter of up and down-leg were also compared, it shows that the increasing of the diameter of up/down-leg will promote decarburization effectively, which can increase the circulation flow rate and promote the reaction rate.

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Section: Introductionmentioning

confidence: 99%

Mathematical Model for Decarburization Process in RH Refining Process

et al. 2014

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“…(12), (13) or (14 given by Eqs. (12), (13) and (14) based upon the assumption of chemical reactions being the rate-determining step. It …”

Section: Introductionmentioning

confidence: 99%

The Least Number of Chemical Reactions to Describe the Oxidation and the Carburization of Liquid Iron in Irreversible Processes.

et al. 1998

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Mathematical Modelling of Non‐equilibrium Decarburization Process during Vacuum Circulation Refining of Molten Steel: Application of the Model and Results (II) ‐ Non‐equilibrium Factors and their Influences on the Decarburization Process

Wei

2008

steel research international

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The results, which were obtained by applying the novel three-dimensional mathematical model proposed and developed earlier [11 to model and analyse the decarburization process of molten steel during the RH and RH-KTB refining in a 90-t multifunction RH degasser, showed that under the conditions of the present work, the contributions of the flow, mass diffusion and chemical reactions and other non-equilibrium processes to the Raleigh-Onsager dissipation function are not large throughout vacuum circulation refining of molten steel. Thus, it is held everywhere in the whole flow field of the system that the value of the non-linear dissipation factor is approximately equal to one. The entropy generation and energy dissipation in the system rapidly decrease with increasing refining time. Compared to the work done by the drag force while the bubbles passing through the liquid phase as well as by the viscous and turbulent flow and diffusion processes, the carbon-oxygen reaction itself plays a more governing role to the entropy production and energy dissipation in the system. The RH refining process of low and ultra-low carbon steels seems to be close to the linear zone of the non-equilibrium state. The influences of the viscous and turbulent flow dissipation as well as diffusion processes on the non-equilibrium activity coefficients of the carbon and oxygen in the molten steel may almost be neglected. Except in the regions where the chemical C-O reaction takes place (the up-snorkel zone and the bath in the vacuum vessel), the non-equilibrium components of the non-equilibrium activity coefficients of the carbon and oxygen in the molten steel at the other places in the degasser are all tending towards one. The non-equilibrium effects (mainly, the C-O reaction itself)give a restraining role on the decarburization of liquid steel in the RH refining process. This model is able to model more reasonably and precisely the non-equilibrium decarburization process during the vacuum circulation refining of molten steel in comparison to a model without considering the non-equilibrium effects.

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Kinetics for reaction of low-carbon steel melts with CO−CO2 gas mixtures using nonlinear rate equations

Cited by 3 publications

References 10 publications

Mathematical Model for Decarburization Process in RH Refining Process

Mathematical Model for Decarburization Process in RH Refining Process

The Least Number of Chemical Reactions to Describe the Oxidation and the Carburization of Liquid Iron in Irreversible Processes.

Mathematical Modelling of Non‐equilibrium Decarburization Process during Vacuum Circulation Refining of Molten Steel: Application of the Model and Results (II) ‐ Non‐equilibrium Factors and their Influences on the Decarburization Process

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