海洋条件下自然循环蒸汽发生器U型管内倒流特性研究

李孝佳; 张勇; 丛腾龙; 李沛颖; 卢川; 张吉斌

doi:10.13832/j.jnpe.2021.04.0006

海洋条件下自然循环蒸汽发生器U型管内倒流特性研究

doi: 10.13832/j.jnpe.2021.04.0006

1.
哈尔滨工程大学核安全与仿真技术国防重点学科实验室，哈尔滨， 150001
2.
中国核动力研究设计院核反应堆系统设计技术重点实验室，成都， 610213

详细信息

作者简介:
李孝佳（1996—），男，硕士研究生，现主要从事核反应堆热工水力研究，E-mail: xiaojia@hrbeu.edu.cn

通讯作者:
丛腾龙，Email: tlcong@hrbeu.edu.cn

中图分类号: TL334
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- 被引次数: 0
出版历程
- 收稿日期: 2020-05-20
- 修回日期: 2020-12-24
- 刊出日期: 2021-08-15

Research on Characteristics of U-tube Backflow in Natural Circulation Steam Generator under Ocean Conditions

1.
National Defense Key Discipline Laboratory of Nuclear Safety and Simulation Technology, Harbin Engineering University, Harbin, 150001, China
2.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: 当压水堆处于自然循环工况时，蒸汽发生器U型管内可能发生倒流现象，导致一回路流动阻力增大、自然循环流量降低，为反应堆安全运行带来不利影响。基于RELAP5程序建立了海洋条件下的附加力模型及控制体空间坐标求解模型，对蒸汽发生器所有U型管进行建模和节点划分，计算了海洋条件下蒸汽发生器内U型管的倒流临界质量流量及进出口压差，最后分析了3种海洋条件对U型管内流体倒流的影响。结果表明，倾斜条件下有可能会改变倒流现象；而在航行过程中可能遇到的起伏条件都无法改变倒流现象；当摇摆条件比较剧烈时有可能改变倒流现象。
- 蒸汽发生器 /
- 海洋条件 /
- 热工水力 /
- 流动不稳定性
Abstract: When the pressurized water reactor is in natural circulation, reverse flow may occur in the U-tube of the steam generator, which will increase the flow resistance of the primary circuit and decrease the flow of natural circulation, which will adversely affect the safe operation of the reactor. Based on the RELAP5 program, the additional force model under ocean conditions and the spatial coordinate solution model of the control body are established, all U-tubes of the steam generator are modeled and node division are conducted, and the steam generator under ocean conditions (inclination, undulation, swing) is calculated. The critical mass flow rate of the reverse flow and the pressure difference between the inlet and outlet of the inner U-shaped pipe are analyzed. Finally, the influence of three ocean conditions on the reverse flow of the fluid in the U-shaped pipe is analyzed. The results show that the backflow phenomenon may be changed under inclined conditions; the undulating conditions that may be encountered during navigation cannot change the backflow phenomenon; the backflow phenomenon may be changed when the sway conditions are severe.
- Steam generator /
- Marine conditions /
- Thermal hydraulics /
- Flow instability

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图 1 蒸汽发生器示意图

Figure 1. Schematic Diagram of Steam Generator

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图 2 仿真结果与实验结果比较

Figure 2. Comparison of Simulation Results and Experimental Results

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图 3 蒸汽发生器节点划分方案

Figure 3. Node Division Scheme of Steam Generator

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图 4 单管水动力特性曲线

Figure 4. Hydrodynamic Characteristic Curve for Single Pipe

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图 5 进口流量为81 kg/s时各U型管管内流量

Figure 5. Mass Flow Rate in Each U-Tube when Inlet Mass Flow Rate is 82 kg/s

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图 6 进口流量为82 kg/s时各U型管管内流量

Figure 6. Mass Flow Rate in Each U-Tube when Inlet Mass Flow Rate is 82 kg/s

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图 7 摇摆幅度为20°时不同周期下管内流量变化情况

Figure 7. Change of Flow in Pipe under Different Cycles when the Swing Amplitude is 20°

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图 8 周期为10 s时不同摇摆幅度下管内流量变化情况

Figure 8. Change of Flow in Pipe under Different Swing Amplitude when the Cycle is 10 s

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图 9 进口流量为81 kg/s时摇摆条件对倒流的影响

Figure 9. Effect of Rocking Conditions on Reverse Flow when the Inlet Flow Rate is 81 kg/s

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图 10 进口流量为82 kg/s时摇摆条件对倒流的影响

Figure 10. Effect of Rocking Conditions on Reverse Flow when the Inlet Flow Rate is 82 kg/s

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图 11 起伏幅度7 m对1号管内压差及质量流量的影响

Figure 11. Effect of 7 m Fluctuation Range on Pressure Drop and Mass Flow Rate in No. 1 tube

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图 12 起伏幅度12 m对1号管内压差及质量流量的影响

Figure 12. Effect of 12 m Fluctuation Range on Pressure Drop and Mass Flow in No. 1 Tube

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表 1 蒸汽发生器参数

Table 1. Steam Generator Parameters

参数名	蒸汽发生器热功率/MW	一回路工作压力/MPa	一回路水进口温度/K	一回路水出口温度/K	一回路水平均温度/K	一回路进口水比焓/(kJ·kg⁻¹)	一回路出口水比焓/(kJ·kg⁻¹)
参数值	50	15.50	580.15	550.15	560.15	3526.90	3445.80

参数名	一回路进口质量流量/(kg·s⁻¹)	一回路进口质量流密度/(kg·s⁻¹·m⁻²)	二回路工作压力/MPa	二回路给水温度/K	传热管内管直径/m	传热管外管直径/m	U型传热管数目
参数值	500.0	1249.34	5.0	536.15	0.13	0.15	3000

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参考文献(15)

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