液态铅铋合金回路氧输运特性的数值研究

梁瑞仙; 杨凌峰; 王译锋; 李小波; 牛风雷

doi:10.13832/j.jnpe.2022.06.0187

液态铅铋合金回路氧输运特性的数值研究

doi: 10.13832/j.jnpe.2022.06.0187

华北电力大学核科学与工程学院，北京，102206

基金项目: 国家自然科学基金项目（12027813）；国家重点研发计划（2019YFB1901301）

详细信息

作者简介:
梁瑞仙（1994—），男，博士研究生，主要研究液态LBE应用技术，Email: liangruixian@ncepu.edu.cn

中图分类号: TL334
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出版历程
- 收稿日期: 2021-12-07
- 修回日期: 2022-06-08
- 刊出日期: 2022-12-14

Numerical Study on Oxygen Transport Characteristics in Liquid Lead-Bismuth Eutectic Circuit

School of Nuclear Science and Technology, North China Electric Power University, Beijing, 102206, China

摘要

摘要: 为研究液态铅铋合金（LBE）冷却剂系统气态氧控装置——膨胀箱中覆盖气体的氧输运特性，利用计算流体动力学（CFD）软件ANSYS Fluent对氧输运进行了数值计算。根据覆盖气体流动特性和混合气体中低氧分压特点，对膨胀箱气相空间进行简化，将气-液交界面视为氧浓度恒定的自由表面边界，采用组分输运模型计算气体和液态LBE之间传质后的液态LBE氧浓度。结果表明，传质系数随液态LBE入口流速增大而增大，液态LBE入口流速增大则膨胀箱内气-液对流强度增加，有利于增强膨胀箱的氧输运；膨胀箱中液态LBE温度越高，则氧输运的平均传质系数越大；在液态LBE入口流速一定时，平均传质系数可表示为温度的递增函数。在饱和氧浓度阈值内，入口氧浓度和气-液交界面氧浓度不影响膨胀箱的传质系数，对液态LBE回路的氧浓度控制有利。本研究定量获得了使液态LBE回路处于合理氧浓度范围内的操作条件，为实验及系统设计提供数据参考。
- 液态铅铋合金（LBE） /
- 氧输运 /
- 气态氧控 /
- 计算流体动力学（CFD） /
- 组分输运模型
Abstract: In order to study the oxygen transport characteristics of the cover gas in a gaseous oxygen control device of liquid lead-bismuth eutectic (LBE) coolant system--expansion tank, the numerical calculation of oxygen transport was carried out by ANSYS Fluent software using computational fluid dynamics (CFD). According to the flow characteristics of the cover gas and the characteristics of low oxygen partial pressure in the gas mixture, the gas-phase space of expansion tank was simplified, the gas-liquid interface was regarded as the free surface boundary with constant oxygen concentration, and the oxygen concentration in liquid LBE after mass transfer between gas and liquid LBE was calculated by component transport model. The results show that the mass transfer coefficient increases with the increase of liquid LBE inlet velocity. When the inlet velocity of liquid LBE increases, the intensity of gas-liquid convection in the expansion tank increases, which is beneficial to enhance the oxygen transport in the expansion tank. The higher the LBE temperature in the expansion tank, the greater the average mass transfer coefficient of oxygen transport. When the liquid LBE inlet velocity is constant, the average mass transfer coefficient can be expressed as an increasing function of temperature. Within the saturated oxygen concentration threshold, the inlet oxygen concentration and the oxygen concentration at the gas-liquid interface do not affect the mass transfer coefficient of the expansion tank, which is beneficial for oxygen concentration control of liquid LBE circuit. In this study, the operating conditions for the liquid LBE circuit to be in a reasonable range of oxygen concentration were obtained quantitatively, which provided data reference for experiment and system design.
- Liquid lead-bismuth eutectic (LBE) /
- Oxygen transport /
- Gaseous oxygen control /
- Computational fluid dynamics (CFD) /
- Component transport model

HTML全文

图 1 液态LBE回路设计图

Figure 1. Liquid LBE Circuit Design Diagram

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图 2 扩散模型验证结果

Figure 2. Validation Results of Diffusion Model

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图 3 液态LBE冷却剂系统氧浓度合理区间及部分模拟结果　　　　　

C_out—平均出口氧浓度

Figure 3. Reasonable Range of Oxygen Concentration in Liquid LBE Coolant System and Some Simulation Results

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图 4 平均传质系数随膨胀箱液态LBE入口流速变化

Figure 4. Change of Average Mass Transfer Coefficient with Liquid LBE Inlet Velocity of Expansion Tank

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图 5 平均传质系数随液态LBE温度变化

Figure 5. Change of Average Mass Transfer Coefficient with Liquid LBE Temperature

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图 6 液态LBE温度为600℃下平均传质系数随入口氧浓度的变化

Figure 6. Change of Average Mass Transfer Coefficient with Inlet Oxygen Concentration at Liquid LBE Temperature of 600℃

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图 7 液态LBE温度为400℃下平均传质系数随气-液交界面氧浓度变化

Figure 7. Change of Average Mass Transfer Coefficient with Oxygen Concentration of Gas-Liquid Interface at Liquid LBE Temperature of 400℃

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表 1 模拟计算矩阵

Table 1. Simulation of Calculation Matrix

物性参数	参数值
液态LBE温度/℃	300、350、400、450、500、550、600
回路膨胀箱液态LBE 入口流速 /(m·s⁻¹)	0.2、0.3、0.4、0.5、0.6
入口平均氧浓度/%	1.0×10⁻⁹、1.0×10⁻¹⁰、1.0×10⁻¹¹
气-液交界面氧浓度/%	1.0×10⁻⁶、5.0×10⁻⁶、1.0×10⁻⁵、2.0×10⁻⁵、5.0×10⁻⁵、1.0×10⁻⁴

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