Numerical Analysis of Combustion Mechanism in Iron Bath Type Smelting Reduction Furnace

Shinotake, Akihiko; Takamoto, Yasushi

doi:10.2355/tetsutohagane1955.78.7_1250

Cited by 3 publications

(5 citation statements)

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“…[22] Some researchers have investigated the postcombustion mechanism and method to optimize the postcombustion. [23][24][25][26][27][28] It has been well documented that the top lance jet in the BOF converter [23] and the coherent jet behavior [29][30][31][32][33][34] for other processes could be largely influenced by the combustion phenomena. Nevertheless, to study the effects of postcombustion on the flow behavior by direct observation and measurement is still difficult for the BOF process.…”

Section: Introductionmentioning

confidence: 99%

“…and chemical reaction profoundly, the role of postcombustion together with its dynamic characteristics remains largely unexamined systematically for the BOF process. The available research results, [24,35,41] which suffered from a paucity of development of CFD and study methods, are insufficient to be fully applied to describe the combustion behavior of the oxygen lance jet.…”

Section: Introductionmentioning

confidence: 99%

“…[ 22 ] Some researchers have investigated the postcombustion mechanism and method to optimize the postcombustion. [ 23–28 ] It has been well documented that the top lance jet in the BOF converter [ 23 ] and the coherent jet behavior [ 29–34 ] for other processes could be largely influenced by the combustion phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…Although it is well known that the postcombustion characteristics and dynamic behaviors of the oxygen jet affect the bath flow, slag–metal interaction, emulsion formation, heat transfer, and chemical reaction profoundly, the role of postcombustion together with its dynamic characteristics remains largely unexamined systematically for the BOF process. The available research results, [ 24,35,41 ] which suffered from a paucity of development of CFD and study methods, are insufficient to be fully applied to describe the combustion behavior of the oxygen lance jet.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Postcombustion Effects on the Supersonic Jet Behavior

Zhang,

Wang,

Chen

et al. 2024

steel research int.

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During the top blowing process of the basic oxygen furnace, the oxygen jet may react with CO before it reaches the surface of the molten bath. This combustion reaction affects the dynamic characteristics of the jet, which, in turn, affects its interaction with the bath. In this study, a numerical model is developed to investigate the transient and steady combustion characteristics of the supersonic jet emitted from the top lance. The transient combustion simulation shows that the CO ratio gradually decreases while the CO2 mole fraction increases at the interaction boundary region between jet and ambient due to the chemical reactions. In addition, the jet profile is changed when the postcombustion is introduced. Due to the flame formation and turbulence change at the jet combustion interface, the axial velocity at height of 2 m (x = 73 re) is 89% higher than that of the noncombustion reaction jet flow. In the results, it is demonstrated that the combustion interface is favorable to reduce the jet decay, resulting a higher dynamic pressure before the jet reaches the bath surface. Furthermore, a higher core temperature and lower density are obtained for the combustion jet compared to that of without combustion reaction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Analysis of Postcombustion Effects on the Supersonic Jet Behavior

Zhang,

Wang,

Chen

et al. 2024

steel research int.

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“…Combustion reactions have been described with the SCRS-approach [22] or a variant, the simple back-reaction model [19]. Also chemical equilibrium models [19] or systems of reaction equations [21] have been applied. Comparable modelling was developed for post combustion in oxygen steelmaking [23; 24].…”

mentioning

confidence: 99%

Mathematical model for post combustion in smelting reduction

Becker-Lemgau¹,

Tacke

1996

Steel Research

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Post combustion in the top space of iron bath smelting reduction furnaces is analysed with three-dimensional mathematical modelling. Momentum transport and continuity equations in combination with a k-e model of turbulence are numerically solved for the gas flow field. Combustion reactions are modelled by a set of transport equations based on the SCAS combustion model and its extension to the k-f-g model. A two-stage combustion scheme is formulated to include carbon transfer and combustion. Heat transfer to bath and droplets is approximated including radiation. Computation results for rectangular reactors are presented with velocity patterns and combustion fields. The complex shapes of post combustion flames are demonstrated. Process parameters are varied to study their influence on combustion and heat transfer to the bath. Effects of the injection geometry are illustrated. MathematischesModell fUr die Nachverbrennung bei der Schmelzreduktion. Die Nachverbrennung in der Gaszone von Eisenbadreaktoren wird mit einem dreidimensionalen mathematischem Modell untersucht. Impulstransport-und Kontinuitatsgleichungen werden in Kombination mit einem k-f-Modell fOr die Turbulenz numerisch gelost, woraus die Stromungsfelder in der Gasphase erhalten werden. Verbrennungsreaktionen werden mit Hilfe von Transportgleichungen beschrieben, die auf dem SCRS-Verbrennungsmodell und seiner Erweiterung zum k-f-g-Modell basieren. Ein zweistufiges Verbrennungsschema zur Behandlung des Transports von Kohlenstoff und seiner Verbrennung wird vorgestellt. Das Modell erfaBt Warmestrahlung sowie Warmetransport an Trapfen und Bad. Aechenergebnisse fOr Geschwindigkeits-und Verbrennungsfelder werden fOr rechteckige Reaktoren dargestellt. Die komplizierten Geometrien der auftretenden Nachverbrennungsflammen sind erkennbar. AnschlieBend werden ProzeBparameter variiert und der EinfluB der Einblasgeometrie dargestellt.

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