Analysis of Steady and Transient Characteristics of Once-through Steam Generator for Lead Bismuth Fast Reactor
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摘要: 铅铋快堆的安全稳定运行与换热器一二次侧间的散热性能密切相关。本研究通过建立基于铅铋快堆的直流蒸汽发生器（OTSG）稳态与瞬态耦合分布参数模型，分析对比了不同负荷条件下OTSG内部热工水力特性的分布差异，并进一步揭示了铅铋快堆一次侧焓值及流量扰动对换热器动态散热性能的影响。结果表明：稳态传热时铅铋快堆一次侧温降主要集中在过冷沸腾及核态沸腾区，二次侧负荷减小将导致管壁面温度飞升前移；动态调节显示在设计工况下一次侧入口焓值仅下降5%，就可能导致铅铋快堆循环在90 s后进入事故工况。研究结果为铅铋快堆的OTSG动态流动换热特性研究及结构设计优化提供了有价值的建议。Abstract: The safe and stable operation of lead bismuth fast reactor is closely related to the heat dissipation performance between the primary and secondary sides of the heat exchanger. In this study, the steady-state and transient coupled distribution parameter model of once-through steam generator (OTSG) based on lead bismuth fast reactor is established. The distribution difference of thermal and hydraulic characteristics in OTSG under different load conditions is analyzed and compared, and the influence of primary enthalpy and flow disturbance of lead bismuth fast reactor on the dynamic heat dissipation performance of heat exchanger is further revealed. The steady-state results show that the temperature drop on the primary side of the lead bismuth fast reactor was mainly concentrated in the subcooled boiling and nucleate boiling regions, and the decrease in the secondary side load can cause the temperature jump on the tube wall. The dynamic results show that the primary side inlet enthalpy only decreases by 5% under design conditions, which may lead to the lead bismuth reactor cycle entering accident conditions after 90 seconds. The relevant results provide valuable suggestions for the study of OTSG flow and heat transfer characteristics and structural design optimization of the lead bismuth fast reactor.
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图 1 铅铋快堆OTSG几何结构示意图
Figure 1. Geometric Structure of OTSG for Lead Bismuth Fast Reactor
图 4 满负荷下OTSG各部分温度沿管长的分布
Figure 4. Temperature Distribution of Each OTSG Part along the Tube Length under Full Load
图 5 不同负荷下OTSG各部分温度沿管长的分布
Figure 5. Temperature Distribution of Each OTSG Part along the Tube Length under Different Loads
图 6 各传热区域长度占比随负荷变化
Figure 6. Variation of Length Ratio of Each Heat Transfer Zone with Load
图 7 不同负荷下流体的平均温度变化
Figure 7. Variation of Average Temperature of Fluid under Different Loads
图 8 一次侧焓值下降OTSG的温度随时间变化关系
Figure 8. Temperature Variation of OTSG with Time When Enthalpy of Primary Side Decreases
图 9 一次侧流量下降OTSG的换热分区占比动态变化
Figure 9. Dynamic Change of Heat Transfer Zone of OTSG with Primary Side Flowrate Decrease
表 1 铅铋合金热工物性计算
Table 1. Calculation of Thermal Properties of LBE
铅铋物性 经验关系式 ρ/(kg·m−3) $ {\rho_{_{{\text{LBE}}}}} = 11096 - 1.3236T $ cp/[J·(kg·K)−1] $ {c_{p\;,_{\text{LBE}}}} = 159 - 2.72 \times {10^{ - 2}}T + 7.12 \times {10^{ - 6}}{T^2} $ η/(Pa·s) $ {\eta _{{\text{LBE}}}} = 4.94 \times {10^{ - 4}}{\text{exp}}\left(\dfrac{{754.1}}{T}\right) $ λ/[W·(m·K)−1] $ {\lambda _{{\text{LBE}}}} = 3.61 + 1.517 \times {10^{ - 2}}T - 1.741 \times {10^{ - 6}}{T^2} $ $ T $—温度；$ \rho $—密度；$ {c_{p\;}} $—比热容；$ \eta $—动力粘度 
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表 2 求解程序中各传热区域分段的判别条件
Table 2. Discriminant Conditions for Segmentation of Each Heat Transfer Region in the Numerical Code
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表 3 设计点的计算边界条件
Table 3. Boundary Conditions for Design Points
参数名 参数值 堆芯功率/MW 1284 一次侧运行压力/MPa 15.17 二次侧运行压力/MPa 6.38 一次侧质量流量/(kg·s−1) 8273 二次侧质量流量/(kg·s−1) 680.4 一次侧入口温度/℃ 237.8 二次侧入口温度/℃ 317.7
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