凝汽器管道壁面泄漏流场数值模拟研究

doi:10.13385/j.cnki.vacuum.2023.06.03

真空 ›› 2023, Vol. 60 ›› Issue (6): 15-21.doi: 10.13385/j.cnki.vacuum.2023.06.03

凝汽器管道壁面泄漏流场数值模拟研究

张红星¹, 眭霄翔¹, 王海军¹, 刘中华¹, 陈怀东¹, 张海峰²

1.中广核检测技术有限公司,江苏苏州 215004;
2.北京卫星环境工程研究所,北京 100094

收稿日期:2022-09-02 出版日期:2023-11-25 发布日期:2023-11-27
作者简介:张红星（1981-）,男,江苏溧阳人,高级工程师。

Numerical Simulation Study of Leakage Flow Field on the Wall Surface of Condenser Pipe

ZHANG Hong-xing¹, SUI Xiao-xiang¹, WANG Hai-jun¹, LIU Zhong-hua¹, CHEN Huai-dong¹, ZHANG Hai-feng²

1. CGN Inspection Technology Co., Ltd., Suzhou 215004, China;
2. Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China

Received:2022-09-02 Online:2023-11-25 Published:2023-11-27

摘要/Abstract

摘要： 凝汽器作为核电厂热力循环中的冷却设备,乏汽通过与其内的冷却水进行热交换形成冷凝水以进行再次热力循环。凝汽器所用的海水冷却水一旦泄漏就会对二回路的蒸汽发生器造成污染,进而影响核电站的安全运行。本文针对凝汽器液相泄漏过程的流动特性进行了数值模拟研究,采用Euler-Euler两相流模型和k-ε湍流模型分析了不同流动工况下两相泄漏过程的流场,在常温常压情况下通过粒子图像测速（PIV）对凝汽器冷凝管的泄漏过程进行了可视化测量分析,并与数值模拟作了对比。结果表明：气液两相同时存在于泄漏过程中时,泄漏量与管道内液相流动工况无关,只与管道内外侧压差相关;泄漏的检测时间可设定在发生泄漏后0.003s内,此时泄漏射流附近存在的两个回流涡会导致示踪气体的回流,可能会对示踪气体的传质和对流扩散产生影响;管道内外侧压差为100000Pa情况下,冷却剂泄漏的质量流量约为3.925×10^-3kg/s 至9.813×10^-3kg/s。

关键词: 核电厂, 凝汽器, 真空射流, 泄漏检测, PIV实验验证

Abstract: Condenser is a cooling device in the thermal cycle of a nuclear power plant. The exhausting steam undergoes heat exchange with the cooling water in the condenser to form condensed water for another thermal cycle. Due to the seawater used as cooling water, the leakage of condenser will lead to pollution of steam generator in the secondary circuit, which will affect the safety of the nuclear power plant. In this paper, the flow characteristics of the liquid phase leakage process of the condenser were studied numerically and experimentally. The leakage jet flow field under different flow conditions was analyzed by Euler-Euler two-phase flow model and k-ε turbulence model. The leakage process was measured and analyzed by particle image velocimetry and compared with numerical simulation results. The results show that the leakage amount is related to pressure difference between the gas space and coolant rather than the liquid phase flow condition in the pipeline during the two-phase leakage. The detection time of the leak can be set within 0.003s, and the existence of two backflow vortexes near the leakage jet will lead to the return of the tracer gas, which may have an impact on the mass transfer and convective diffusion of the tracer gas. For the current case, the mass flow rate of the coolant leakage is about 3.925×10^-3-9.813 ×10^-3kg/s.

Key words: nuclear power plant, condenser, vacuum jet, leak detection, PIV experimental validation

中图分类号: TL48;O359⁺.1

张红星, 眭霄翔, 王海军, 刘中华, 陈怀东, 张海峰. 凝汽器管道壁面泄漏流场数值模拟研究[J]. 真空, 2023, 60(6): 15-21.

ZHANG Hong-xing, SUI Xiao-xiang, WANG Hai-jun, LIU Zhong-hua, CHEN Huai-dong, ZHANG Hai-feng. Numerical Simulation Study of Leakage Flow Field on the Wall Surface of Condenser Pipe[J]. VACUUM, 2023, 60(6): 15-21.

参考文献

[1] 刘昱, 刘佩, 秦娟. 内陆核电厂放射性废液排放的主要问题分析[J]. 辐射防护, 2013, 33(5): 269-274.
[2] GUOAN Y, HUI H, RUSHAN L, et al.R&D activities on actinide separation in China[J]. Procedia Chemistry, 2012, 7: 215-221.
[3] 张贤山, 孙培伟, 魏新宇. 汽轮机蒸汽旁路排放系统的动态特性分析[J]. 核动力工程, 2021, 42(增刊2): 25-28.
[4] 李开盈, 王旭, 陈松, 等. 核电厂凝汽器传热管缺陷处理与分析[J]. 产业与科技论坛, 2022, 21(7): 44-46.
[5] 陈勇. 核电厂凝汽器泄漏的探究[J]. 科技视界, 2016(9): 8-11.
[6] 李勇, 曹丽华, 赵金峰, 等. 考虑更多因素的凝汽器最佳真空确定方法[J]. 中国电机工程学报, 2006(4): 71-75.
[7] 叶长流, 黄怡彬, 郭昂, 等. 凝汽器泄漏对二回路水质的影响及其对策研究[C]//中国核学会2017年学术年会. 2017: 261-266.
[8] 何洁, 高虎, 何鹰. 核电站凝汽器检漏装置的设计及应用[J]. 装备制造技术, 2013(9): 146-148.
[9] 季怡萍, 邓先钦, 徐鹏, 等. SF6气体泄漏红外成像检测的技术分析和应用探讨[J]. 红外技术, 2022, 44(2): 198-204.
[10] 陈大兵, 丁辉, 李晓红, 等. 电厂凝汽器管泄漏的在线检测[J]. 江苏电机工程, 2004(4): 46-47.
[11] 王建夫, 张志胜, 安国印, 等. 气体示踪技术在盐穴地下储气库微泄漏监测中的应用[J]. 天然气工业, 2021, 41(12): 156-164.
[12] 窦梓元. 水体中天然气管道泄漏扩散规律及后果分析[D]. 成都: 西南石油大学, 2015.
[13] KELSO R M, LIM T T, PERRY A E.An experimental study of round jets in cross-flow[J]. Journal of Fluid Mechanics, 2006, 306: 111-144.
[14] LIM T T, NEW T H, LUO S C.On the development of large-scale structures of a jet normal to a cross flow[J]. Physics of Fluids, 2001, 13(3): 770-775.
[15] 孙振平, 褚孝荣, 周李军. 核电厂凝汽器检漏系统的取样点设计要求和方案[J]. 电站辅机, 2015, 36(3): 9-11.
[16] SONG Y, SHENTU Y, QIAN Y, et al.Experiment and modeling of liquid-phase flow in a venturi tube using stereoscopic PIV[J]. Nuclear Engineering and Technology, 2021, 53(1): 79-92.
[17] 张珅榕, 蔡卫军, 闵景新. 基于欧拉多相流模型的空泡数值模拟[J]. 船海工程, 2015, 44(1): 103-106.
[18] TROSHKO A A, HASSAN Y A.A two-equation turbulence model of turbulent bubbly flows[J]. International Journal of Multiphase Flow, 2001, 27(11): 1965-2000.
[19] LATEB M, MASSON C, STATHOPOULOS T, et al.Comparison of various types of k-ε models for pollutant emissions around a two-building configuration[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2013, 115: 9-21.
[20] RISSO F.Agitation,mixing,and transfers induced by bubbles[J]. Annual Review of Fluid Mechanics, 2018, 50: 25-48.
[21] 王杰, 刘东, 刘盈, 等. 失水事故分析程序临界流模型改进及验证[J]. 核动力工程, 2019, 40(1): 28-32.
[22] 李乾军, 章名耀. 压力对喷动流化床流动特性影响的数值模拟[J]. 动力工程, 2009, 29(9): 831-836.

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凝汽器管道壁面泄漏流场数值模拟研究

Numerical Simulation Study of Leakage Flow Field on the Wall Surface of Condenser Pipe

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