Investigation of Radial Thermal-Hydraulic Characteristics of Sodium Heated Once-Through Steam Generator
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摘要: 钠-水直流蒸汽发生器是钠冷快堆的重要设备，传统的蒸汽发生器一维热工水力系统分析程序无法考虑径向热工水力参数分布，不适用于疲劳和热应力分析。为了计算蒸汽发生器的径向热工水力参数分布，采用管网、管道和蒸汽发生器部件相结合的方法开发了TCOSS-2D程序。首先，利用TCOSS-2D对中国示范快堆（CFR600）蒸汽发生器原型样机进行了径向多层建模和热工水力计算，结果表明程序计算的瞬态响应变化趋势与实验符合良好，验证了程序的径向热工水力计算能力；其次，考虑了钠-水直流蒸汽发生器钠侧径向不均匀流量分配，结果表明钠侧径向不均匀流量分配对蒸发器径向温度差异影响大于过热器，瞬态变化过程中钠侧的非均匀流量分配对水侧的不均匀性影响相对较小。因此，本研究开发的钠-水直流蒸汽发生器数值模型能够用于其径向热工水力特性的分析。
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关键词:
- TCOSS-2D /
- 钠-水直流蒸汽发生器 /
- 径向热工水力 /
- 程序验证
Abstract: The sodium heated once-through steam generator is the critical equipment of a sodium-cooled fast reactor. The traditional one-dimensional thermal-hydraulic system analysis code cannot take into account the radial thermal-hydraulic parameter distributions of the steam generator, and therefore is not applicable to fatigue and thermal stress analyses. In order to calculate the radial thermal-hydraulic parameter distribution of the steam generator, the TCOSS-2D code was developed adopting a combination of pipe network, pipeline and steam generator. Firstly, radial multilayer modeling and thermal-hydraulic calculations were carried out on the steam generator prototype of the Chinese demonstration fast reactor (CFR600) using TCOSS-2D, and the results showed that the transient response trend calculated by the code was in good agreement with the experiment, so the radial thermal hydraulic calculation capability of the code was validated. Secondly, the radial non-uniform flow distribution on the sodium side of the sodium heated once-through steam generator was considered and compared. The results show that the radial non-uniform sodium-side flow distribution has a greater effect on the radial temperature difference of the evaporator than the superheater, while the non-uniform flow distribution of the sodium-side of the transient process has a relatively small effect on the non-uniformity of the water-side. Therefore, the numerical model of sodium heated once-through steam generator developed in this study can be utilized for the analysis of its radial thermal-hydraulic characteristics. -
图 2 管网模型示意图
ΔPi—管道压降；dWi/dt—质量流量的时间导数；Pi—节点压力
Figure 2. Schematic Diagram of Pipe Network Model
图 6 钠侧流量均匀分配时钠侧温度计算值与实验值对比
R#N—第N层，下同
Figure 6. Comparison of Calculated and Experimental Results of Sodium-side Temperature for Uniform Sodium-side Flow Distribution
图 7 钠侧流量均匀分配时水侧温度计算值与实验值对比
Figure 7. Comparison of Calculated and Experimental Results of Water-side Temperature for Uniform Sodium-side Flow Distribution
图 8 钠侧流量均匀分配时钠侧轴向温度计算值与实验值对比
Figure 8. Comparison of Calculated and Experimental Results of Sodium-side Axial Temperature for Uniform Sodium-side Flow Distribution
图 9 钠侧流量非均匀分配时钠侧温度计算值与实验值对比
Figure 9. Comparison of Calculated and Experimental Results of Sodium-side Temperature for Non-uniform Sodium-side Flow Distribution
图 10 钠侧流量非均匀分配时水侧温度计算值与实验值对比
Figure 10. Comparison of Calculated and Experimental Results of Water-side Temperature for Non-uniform Sodium-side Flow Distribution
图 11 钠侧流量非均匀分配时钠侧轴向温度计算值与实验值对比
Figure 11. Comparison of Calculated and Experimental Results of Sodium-side Axial Temperature for Non-uniform Sodium-side Flow Distribution
表 1 蒸汽发生器原型样机主要设计参数
Table 1. Major Design Parameters of Prototype Steam Generator
参数名 数值及方式 蒸汽发生器功率/MW 20 传热管布置方式 正三角形 蒸发器传热管长度/m 17.884 过热器传热管长度/m 8.034 蒸发器传热管根数 85 过热器传热管根数 73 壳程设计压力/MPa 2.5 管程设计压力/MPa 17 蒸发器壳程设计温度/℃ 490 蒸发器管程设计温度/℃ 450 过热器壳程设计温度/℃ 510 过热器管程设计温度/℃ 500 
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