A Fundamental Investigation of Decarburization Reactions in the Argon–Oxygen Decarburization Converter Using Coupled Computational Fluid Dynamics and Thermodynamics Databases

Chanouian, Serg; Ahlin, Björn; Tilliander, Anders; Ersson, Mikael

doi:10.1002/srin.202200156

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…However, it is also reasonable to assume that there is a point where a decrease in mixing time would not yield any increase in the reaction rates. Therefore, the objective of this study is to develop a practical model that combines fluid dynamics with chemical reactions, building upon our previous work [26,27]. An arbitrary metallurgical side-blowing reactor with continuous oxygen supply is utilized in this study to investigate the aforementioned effect focusing on the decarburization reaction in a Fe-C-O system.…”

Section: Introductionmentioning

confidence: 99%

The Importance of Mixing Time in Intensely Stirred Metallurgical Reactors: Applied on Decarburization Reactions

Chanouian,

Larsson,

Ersson

2023

Metals

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In metallurgical converter processes, numerical modeling is a useful tool for understanding the complexity of the systems. In this paper, we present a practical model that couples fluid dynamics and chemical reactions to explore the impact of mixing time on decarburization. Using computational fluid dynamics (CFD), in this study, we investigate an arbitrary metallurgical reactor with continuous oxygen supply, focusing on the Fe–C–O system. The model employs local equilibrium, a turbulence limiter, and finite volume method for mass, momentum, and energy transfer. Tracer injection points in the gas plume’s rising region exhibit faster mixing, and a comparison of reaction cases reveals distinct decarburization rates based on oxygen injection distribution and the influence of turbulence on reactions. Overall, while mixing time matters, the results show that this system is primarily governed by thermodynamics and oxygen supply, and a 270% increase in mixing time increase had a small impact on the end carbon content.

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Section: Introductionmentioning

confidence: 99%

The Importance of Mixing Time in Intensely Stirred Metallurgical Reactors: Applied on Decarburization Reactions

Chanouian,

Larsson,

Ersson

2023

Metals

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A Thermodynamic and Kinetic‐Based Argon Oxygen Decarburization Process Model and Validation with Plant Data

Jagadish,

Saragadam,

singha

et al. 2024

steel research int.

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Argon oxygen decarburization (AOD) is one of the most dynamic and complex processes in stainless steel production. Along with a lot of metallic additions, oxygen (O2), argon (Ar), or nitrogen (N2) gas is blown into the reactor to produce complex stainless‐steel grades. Typically, a hit‐and‐trial method approach is followed in the plant to optimize the critical process parameters for producing any new grades or optimizing the existing ones. In this regard, a mathematical model of the process coupled with robust thermodynamic databases is adopted to optimize the process. As discussed in the manuscript, most of the previous models explain the decarburization patterns by assuming a critical carbon (C) content to justify the change in decarburization rate from surface oxidation due to high O2 flow rates at high C levels to liquid phase mass transfer of C at low C levels. In the current study, decarburization patterns are described without any assumption of critical C content. The modeling results are validated against the plant data for a standard 316L grade in a 150 ton AOD converter. Next, the model parameters are implemented as it is for grades 439 and 321 and the AOD model is used as a predictive tool for these grades.

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Modeling Decarburization in the AOD Converter: A Practical CFD-Based Approach With Chemical Reactions

Chanouian,

Pitkala,

Larsson

et al. 2023

Metall Mater Trans B

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Gas-blowing technology is widely used in converter steelmaking to homogenize liquid steel and accelerate chemical reactions, with Argon oxygen decarburization (AOD) being the dominant process for stainless steelmaking. Due to the harsh environment, it is advisable to study the phenomenon using small-scale physical models and numerical simulations before conducting industrial-scale trials. This paper presents a practical computational fluid dynamics (CFD) approach for simulating the AOD process, with chemical reactions considered. This approach can simulate the entire process in a reasonable time using a standard workstation. The simulation employs a Finite Volume Method CFD approach to handle mass, momentum, and energy transfer, and a local equilibrium assumption is utilized. The study shows that a practical approach can be used to model the initial stage of decarburization in the AOD process with a reduced accuracy in mass transport calculations. The accuracy of the simulation is validated using industrial data, and good agreement is found.

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A Fundamental Investigation of Decarburization Reactions in the Argon–Oxygen Decarburization Converter Using Coupled Computational Fluid Dynamics and Thermodynamics Databases

Cited by 6 publications

References 34 publications

The Importance of Mixing Time in Intensely Stirred Metallurgical Reactors: Applied on Decarburization Reactions

The Importance of Mixing Time in Intensely Stirred Metallurgical Reactors: Applied on Decarburization Reactions

A Thermodynamic and Kinetic‐Based Argon Oxygen Decarburization Process Model and Validation with Plant Data

Modeling Decarburization in the AOD Converter: A Practical CFD-Based Approach With Chemical Reactions

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