수치해석을 통한 전기로 수모델 저취 조건에 따른 유동 및 영향력 분석

초록

As the transition toward carbon neutrality accelerates, the demand for alternative iron sources capable of supportinglow-carbon steelmaking has grown substantially. Direct Reduced Iron (DRI), which offers significantly lower greenhouse gasemissions compared to conventional hot metal, has become an essential feedstock for electric arc furnace (EAF) operations. However, DRI often exhibits low melting efficiency and induces unstable bath behavior, underscoring the need for improvedmelting technologies. To address these challenges, this study investigates a bottom-blowing stirring technology designed toenhance thermal and flow control within the EAF when processing large quantities of DRI, supported by both experimentalobservations and computational fluid dynamics (CFD) simulations. A series of melting trials and flow-field analyses wereperformed to evaluate the effects of bottom inert-gas injection on temperature uniformity, melting kinetics, and the overall DRIdissolution behavior. The bottom-blowing parameters were optimized to strengthen bath circulation, promote efficient heattransfer, and eliminate localized cold regions that hinder DRI melting. CFD results further clarified the internal flow structuresand mixing characteristics induced by the bottom-blowing configuration. The findings indicate that controlled bottom stirringsignificantly improves the dissolution rate of DRI by enhancing mixing intensity and stabilizing bath thermodynamics withoutinducing excessive oxidation or energy losses. This study demonstrates that integrating optimized bottom-blowing technologyinto DRI-charged EAF operations can meaningfully enhance melting performance and energy efficiency. The results offervaluable insight into melt behavior under modified flow conditions and provide practical guidance for industrial implementationof DRI-based EAF steelmaking in support of carbon-neutral production strategies.

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