Evaluation of Gas-Liquid Mass Transfer and Interfacial Area in Bubbling Jet

Kumagai, Toru; Iguchi, Manabu; Nakatani, Tadatoshi

doi:10.2355/tetsutohagane1955.89.7_735

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…When the gas dissolves into the bath, the pH level drops owing to the chemical reaction and the pH level was measured every 5 s. The relationship between the pH-value, pH and the absorption is calculated from the thermodynamics representation of the absorption of , in the solution. This is given by the following relationships: 14 where and are the equilibrium constants for the following reactions: where the equilibrium constants for reactions (7) to (9) can be expressed as follows: 15 …”

Section: Theorymentioning

confidence: 99%

Use of physical modelling to study how to increase the production capacity by implementing a novel oblong AOD converter

Samuelsson

Ternstedt²,

Tilliander

et al. 2017

Ironmaking & Steelmaking

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There is no known example of an AOD converter with oblong cross sections in the literature. Changing the geometry of the converter vessel, from the traditional circular cross sections, to increase converter volume could potentially influence the performance of the converter and in particular the decarburisation rate. To study the feasibility of implementing an oblong converter, physical modelling was used to study the fluid flow of the proposed converter configuration, geometry and number of tuyeres, and the potential influence on the decarburisation rate. Two water models were employed using water containing NaOH and gas injected through six or eight tuyeres as fluids. In the model, CO 2 gas was injected and the reaction of CO 2 and NaOH was indirectly measured by detecting the pH value of the water. The mixing time is considered to be a good indicator of the decarburisation as kinetics will be diffusion controlled in the latter period of the process. The following three configurations were studied: (i) a circular converter with six tuyeres, (ii) an oblong converter with six tuyeres, and (iii) an oblong converter with eight tuyeres. The mixing time can be used to evaluate the different converter configurations. The average CO 2 concentrations based on several experiments, differed by less than 5% between the circular and oblong models after 165 s of injection of air and CO 2 . The results also showed that no difference in mixing time could be found when using 6 and 8 tuyeres, respectively in the oblong model, where the CO 2 concentrations differed by less than 2% after 165 s of injection time of air and CO 2 . Based on the findings, it has been observed that the influence of converter geometry on mixing time is small, it was concluded that decarburisation rate is likely to be the same irrespectively of converter geometry.

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Section: Theorymentioning

confidence: 99%

Use of physical modelling to study how to increase the production capacity by implementing a novel oblong AOD converter

Samuelsson

Ternstedt²,

Tilliander

et al. 2017

Ironmaking & Steelmaking

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Analysis of Liquid Phase Mass Transfer at Free Surface in Gas-stirred Vessel

Arai

Matsumoto

2020

Tetsu-to-Hagane

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Gas injection has been widely used to enhance mass transfer and homogenization of temperature and composition of molten steel. In this paper, water model experiments for degassing were performed to investigate mass transfer at free surface in a gas-stirred vessel. Mass transfer coefficients in liquid phase were measured and the correlation with gas flow rate and liquid height were analyzed. A mass transfer model was constructed based on the Levich's model assuming that a part of energy input by gas injection was consumed near the free surface. As a result, the following dimensionless correlation was obtained: The present correlation agrees well with the mass transfer coefficients in liquid phase including previous data for water model systems and that of molten steel systems can be also approximately estimated.

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Evaluation of Gas-Liquid Mass Transfer and Interfacial Area in Bubbling Jet

Cited by 2 publications

References 18 publications

Use of physical modelling to study how to increase the production capacity by implementing a novel oblong AOD converter

Use of physical modelling to study how to increase the production capacity by implementing a novel oblong AOD converter

Analysis of Liquid Phase Mass Transfer at Free Surface in Gas-stirred Vessel

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