分类： 物理学 >> 核物理学 提交时间： 2024-12-09
摘要： Gas-phase oxygen control technology, designed to control the oxygen concentration (Co) in liquid lead-bismuth eutectic (LBE) within an optimal range, represents an effective approach to mitigating corrosion in structural materials. To examine the effects of key parameters including inlet gas flow rate and liquid LBE temperature on the efficiency of this technology, a series of experiments were conducted in static liquid LBE at temperatures ranging from 350-550°C, with an Ar+5%H₂ gas flow of 100-500ml/min. The results were analyzed thermodynamically, to explore comprehensively the oxygen control process. Findings indicate that increases in liquid LBE temperature and inlet gas flow rate markedly enhance the efficiency of oxygen reduction. Specifically, at 550°C, the average oxygen reduction rate achieved 4.35 × 10⁻5wt.%/h, which is approximately two orders of magnitude higher than that observed at 350°C (3.11 × 10⁻7 wt.%/h). Additionally, the average deoxygenation limits (logCo)at temperatures of 350°C, 400°C, 450°C, 500°C, and 550°C stabilized at values of -10.33, -9.56, -8.53, -7.98, and -7.70, respectively. The dissolution and precipitation of temperature-dependent oxides that resist H₂ reduction are the fundamental factors influencing the deoxygenation limit in liquid LBE, with Fe3O4 being the primary determinant.
分类： 物理学 >> 核物理学 提交时间： 2024-12-01
摘要： Gas-phase oxygen control technology, designed to control the oxygen concentration (C0) in liquid lead-bismuth eutectic (LBE) within an optimal range, represents an effective approach to mitigating corrosion in structural materials. To examine the effects of key parameters including inlet gas flow rate and liquid LBE temperature on the efficiency of this technology, a series of experiments were conducted in static liquid LBE at temperatures ranging from 350-550°C, with an Ar+5%H2 gas flow of 100-500ml/min. The results were analyzed thermodynamically, to explore comprehensively the oxygen control process. Findings indicate that increases in liquid LBE temperature and inlet gas flow rate markedly enhance the efficiency of oxygen reduction. Specifically, at 550°C, the average oxygen reduction rate achieved 4.35 × 10⁻5wt.%/h, which is approximately two orders of magnitude higher than that observed at 350°C (3.11 × 10⁻⁷ wt.%/h). Additionally, the average deoxygenation limits (logCo)at temperatures of 350°C, 400°C, 450°C, 500°C, and 550°C stabilized at values of -10.33, -9.56, -8.53, -7.98, and -7.70, respectively. The dissolution and precipitation of temperature-dependent oxides that resist H₂ reduction are the fundamental factors influencing the deoxygenation limit in liquid LBE, with Fe3O4being the primary determinant.
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