Characteristics of oxygen mass transfer in a pneumatic mass exchanger for solid-phase oxygen control in the lead bismuth

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2025-04-03 DOI:10.1016/j.nucengdes.2025.114022

Zhen Yang, Haicai Lyu, Honglin Zhou, Fang Liu, Weihao Xing, Shengfei Wang, Wentao Guo, Zhangpeng Guo, Ruixian Liang, Fenglei Niu

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Abstract

Oxygen concentration in lead–bismuth alloy (LBE) systems has a significant effect on the corrosion rate of structural materials. The corrosion of structural materials by LBE can be effectively mitigated by dynamically adjusting the dissolved oxygen concentration in liquid lead–bismuth. Solid-phase oxygen control technology comprised of a packed bed of lead oxide spheres is widely recognized as an effect and promising solution to regulate the dissolved oxygen concentration, in which how to quantitatively regulate the supplemental solid-phase PbO oxygen source is the key to solid-phase oxygen control technology. This paper innovatively designs a pneumatic mass exchanger for controllable oxygenation without moving parts, and experimentally investigates the oxygen mass transfer characteristics under different temperatures, relative flow velocities, and surface areas of oxygen source areas. By combining an empirical oxygen mass transfer model and the oxygen mass conservation equation, a theoretical prediction model for the reciprocating pneumatic mass exchanger is developed. The results indicate that temperature can rapidly adjust the oxygen dissolution rate, while the relative flow velocity can be used as an effective measure to precisely control the oxygen concentration. The oxygen dissolution rate is directly proportional to the oxygen source surface area. The average relative error of the oxygen concentration between the theoretical prediction model and experimental results is 1.65, with the deviation primarily attributed to discrepancies in oxygen diffusion and the fitting of the mass transfer empirical model. The oxygen concentration in lead–bismuth can be controlled within a reasonable range, thereby validating the oxygenation performance of the novel solid-state oxygen control device—the pneumatic mass exchanger.

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铅铋固相氧控制用气动质交换器氧传质特性研究

铅铋合金（LBE）体系中的氧浓度对结构材料的腐蚀速率有显著影响。通过动态调节铅铋液中溶解氧的浓度，可以有效地缓解LBE对结构材料的腐蚀。由氧化铅球填充床组成的固相氧控制技术被广泛认为是一种有效而有前途的溶解氧浓度调节方案，其中如何定量调节补充的PbO氧源是固相氧控制技术的关键。本文创新性地设计了一种无运动部件可控氧合的气动质交换器，实验研究了不同温度、相对流速、不同氧源区表面积条件下的氧传质特性。将经验氧传质模型与氧质量守恒方程相结合，建立了往复式气动质交换器的理论预测模型。结果表明，温度可以快速调节氧的溶解速率，而相对流速可以作为精确控制氧浓度的有效措施。氧的溶解速率与氧源表面积成正比。理论预测模型与实验结果的平均相对误差为1.65，其主要原因是氧扩散和传质经验模型拟合的差异。可以将铅铋中的氧浓度控制在合理的范围内，从而验证了新型固态氧控制装置—气动质交换器的充氧性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.