Numerical Investigation on the Effects of Impeller Structures in Hot Metal Desulfurization Processes by Mechanical Stirring

Wang, Ruizhi; Jia, Shuyuan; He, Zhu

doi:10.3390/met12020229

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…In order to accurately simulate the movement and dispersion of solid particles during mixing, the DPM model is employed to track the solid particles in the Lagrangian coordinate system. The two-way coupling between the VOF model and the DPM model is realized by the momentum exchange between the continuous phase and the particle phase [32,33], ultimately establishing the solid-liquid-gas multiphase flow model.…”

Section: Numerical Simulationmentioning

confidence: 99%

Mixing Characteristics and Parameter Effects on the Mixing Efficiency of High-Viscosity Solid–Liquid Mixtures under High-Intensity Acoustic Vibration

Zhan

Jiang

et al. 2023

Processes

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High-intensity acoustic vibration is a new technology for solving the problem of uniform dispersion of highly viscous materials. In this study, we investigate the mixing characteristics of high-viscosity solid–liquid phases under high-intensity acoustic vibration and explore the effect of vibration parameters on the mixing efficiency. A numerical simulation model of solid–liquid–gas multiphase flow, employing the volume of fluid (VOF) and discrete phase model (DPM), was developed and subsequently validated through experimental verification. The results show that the movement and deformation of the gas–liquid surface over the entire field are critical for achieving rapid and uniform mixing of the solid–liquid phases under acoustic vibration. Increasing the amplitude or frequency of vibration can intensify the movement and deformation of the free surface of gas and liquid, improve the mixing efficiency, and shorten the mixing time. Under the condition of constant acceleration, the mixing efficiency of materials is higher at low frequency and high amplitude. Further, we define a relationship that predicts desirable mixing conditions as a function of amplitude and frequency. This serves as a valuable reference guide for evaluating the minimum requirements when selecting operating parameters.

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Section: Numerical Simulationmentioning

confidence: 99%

Mixing Characteristics and Parameter Effects on the Mixing Efficiency of High-Viscosity Solid–Liquid Mixtures under High-Intensity Acoustic Vibration

Zhan

Jiang

et al. 2023

Processes

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“…To forecast the desulfurization behavior in the ladle, several researchers [20][21][22] also suggested mathematical models including the thermodynamic processes and the computational fluid dynamics (CFD) model. To simulate the desulfurization process in the kambara reactor (KR), Wang et al [23] developed a three-dimensional transient coupling mathematical model utilizing the volume of fluid (VOF) and discrete phase model. They compared the desulfurization efficiency of different impellers quantitatively by the model.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the dolomite in-situ desulfurization in molten iron

Shen

Yu²,

Zhang³

et al. 2023

Mater. Res. Express

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With the growing need for high-quality steel, the requirement for efficient deep desulfurization technologies is growing, and lots of research have be conducted. The desulfurization in hot iron with Mg produced in situ by the aluminothermic reduction of decomposed dolomite was simulated. The magnesium generated at the molten matte-slag interface is dissolved in the molten iron and desulfurizing while spread downwards The process has been studied by experiment and computational fluid dynamics simulation. Some analysis and assumptions were made for the simulation conditions and the simulated data are in good agreement with the experimental results. The rate of desulfurization depended mainly on the reaction rate and is almost independent of the rate of diffusion of Al、S and Mg according to the results. Under the present experimental conditions, the desulfurization rate increased with the increase in temperature and the amount of reactants. However, the effect is not obvious when the temperature is higher than 1623K. The adjustment in diffusion coefficient has minimal influence on the desulfurization efficiency. The desulfurization reaction is mainly in the homogeneous phase, and the proportion of magnesium bubble desulfurization could be ignored when the temperature is higher than 1523K.

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The effect of impeller height and rotation speed on the Kambala reactor desulfurization process

Ji,

Xu,

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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To improve the utilization efficiency of desulfurizer in the Kambala reactor liquid iron desulfurization process and prolong the life of the impeller, the height of the impeller and its optimal matching rotation speed are optimized. Through numerical simulation, the mixing effect of different height impellers under different rotation speeds is studied, the movement and distribution modes of desulfurizer particles are analyzed, the pumping capacity and power are calculated, and the influence of impeller height and optimal matching rotation speed on the desulfurization effect has been clarified. The numerical simulation results show that the optimization of impeller height and optimal matching rotation speed can improve the mixing effect. The height of the impeller increases, and its optimal matching rotation speed decreases. Based on the results, in existing models, it is recommended to run at 60 r/min with an impeller height of 800 mm for optimal mixing performance.

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Numerical Investigation on the Effects of Impeller Structures in Hot Metal Desulfurization Processes by Mechanical Stirring

Cited by 4 publications

References 27 publications

Mixing Characteristics and Parameter Effects on the Mixing Efficiency of High-Viscosity Solid–Liquid Mixtures under High-Intensity Acoustic Vibration

Mixing Characteristics and Parameter Effects on the Mixing Efficiency of High-Viscosity Solid–Liquid Mixtures under High-Intensity Acoustic Vibration

Numerical simulation of the dolomite in-situ desulfurization in molten iron

The effect of impeller height and rotation speed on the Kambala reactor desulfurization process

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