Analysis of Heat Transfer Characteristics of Steam Generator with Axial Economizer Based on RELAP5
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摘要: 立式自然循环蒸汽发生器作为压水堆核电站的重要设备，增强其换热性能对整个电站的经济性至关重要。本研究选用AP1000的蒸汽发生器作为研究对象，并利用RELAP5系统分析程序，分别对传统蒸汽发生器和轴流式预热蒸汽发生器进行计算分析，研究了轴流式预热蒸汽发生器的换热机理，并着重分析了不同纵向隔板高度和循环水分配率对换热特性的影响。结果表明：轴流式预热蒸汽发生器能够显著提升一、二次侧传热温差，从而有效提高整体换热效率；此外，研究还发现提升隔板高度能在一定程度上提高换热能力，并存在最佳隔板高度使得换热功率达到峰值；同时，通过降低循环水分配率有助于增大传热温差，进一步提高换热性能。本研究为轴流式预热蒸汽发生器工程分析和设计提供参考依据。
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关键词:
- 轴流式预热蒸汽发生器 /
- 传热特性 /
- 隔板高度 /
- 循环水分配率 /
- 换热功率
Abstract: The vertical natural-circulation steam generator, as a crucial equipment in pressurized water reactor nuclear power plants, enhancing its heat transfer performance is vital to the economy of the entire power plant. This study selects the steam generator of AP1000 as the research object and employs the RELAP5 system analysis program to calculate and analyze both the conventional steam generator and the steam generator with axial economizer. The heat transfer mechanism of the steam generator with axial economizer is studied, and focus on the effects of different heights of the divider plate and the recirculated water distribution ratio on the heat transfer characteristics. The results show that the steam generator with axial economizer can significantly increase the heat transfer temperature difference between the primary and secondary sides, thereby effectively enhancing the overall heat transfer efficiency. In addition, the study finds that increasing the height of the divider plate can improve the heat transfer capacity to a certain extent, and there is an optimal height at which the heat transfer power reaches its peak. Moreover, reducing the recirculated water distribution ratio helps to increase the heat transfer temperature difference, further improving the heat transfer performance. This research provides reference for the engineering analysis and design of the steam generator with axial economizer. -
图 2 轴流式预热蒸汽发生器的RELAP5节点图
Figure 2. Node Diagram of RELAP5 for Steam Generator with Axial Economizer
图 3 沿一次侧流体流动方向流体温度变化
Figure 3. Fluid Temperature Changes Along t Primary Side Fluid Flow Direction
图 4 沿一次侧流体流动方向管壁外表面热流密度
Figure 4. Heat Flux Density on the Outer Surface of the Tube Wall Along the Primary Side Fluid Flow Direction
图 7 不同隔板高度的预热区温度分布
Figure 7. Temperature Change of the Preheating Section Under Different Plate Heights
图 9 换热功率随循环水分配率的变化
Figure 9. Variation of Heat Exchange with the Ratio of Recirculated Water
图 10 产汽量随循环水分配率的变化
Figure 10. Variation of Steam Production with the Ratios of Recirculated Water
图 11 不同循环水分配率的预热区温度分布
Figure 11. Temperature Change of the Preheating Section Under Different Ratios of Recirculated Water
图 12 不同循环水分配率的二次侧空泡份额分布
Figure 12. Void Fraction Distribution Under Different Ratios of Recirculated Water
表 1 AP1000蒸汽发生器的RELAP5稳态计算结果
Table 1. Steady-State Calculation Results of RELAP5 for AP1000 Steam Generator
参数 设计值[14] 计算值 相对偏差/% 换热功率/MW 1707.5 1711.5 0.23 蒸汽出口压力/MPa 5.77 5.78 0.17 蒸汽流量/(kg·s−1) 943.7 943.7 0 一次侧出口温度/K 553.80 553.47 −0.06 一次侧流体流量/(kg·s−1) 7591.3 7591.5 0.003 循环倍率 3.71 3.71 0 
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