换料水箱不同初始温度对非能动余热排出热交换器换热性能的影响  

Effect of Different Initial Temperatures of IRWST on Heat Exchange Performance of Passive Residual Heat Removal Heat Exchanger

作　　者：严林峰 吴幸慈 Yan Linfeng;Wu Xinci(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan,430074,China)

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《核动力工程》2021年第S02期20-24,共5页Nuclear Power Engineering

摘　　要：为探索AP1000内置换料水箱(IRWST)不同初始温度对非能动余热排出热交换器(PRHR HX)换热性能的影响,并讨论调整IRWST水温的效益,采用计算流体动力学分析的方法对其进行瞬态数值模拟,湍流模型选用标准的k-ε模型,压力和速度的修正选择SIMPLEC算法。结果表明,降低IRWST的初始温度可提高PRHR HX的换热性能;IRWST初始温度和管束出口平均温度呈正比;管束进出口相对温降随IRWST初始温度的降低呈线性增加。在此基础上,对后续的研究发展方向进行了展望,提出在发生事故后,先提高IRWST水温以降低堆芯组件热应力损伤和流体振动,然后慢慢降低IRWST水温以维持换热能力,使其不但保有反应堆堆芯的完整性、无损反应堆堆芯组件并且能够维持堆芯长期冷却的设计思路。CFD computations were conducted to investigate the effect of different initial temperatures of the AP1000 In-containment Refueling Water Storage Tank(IRWST)on the heat exchange performance of Passive Residual Heat Removal heat exchanger(PRHR HX),and to discuss possible benefits of adjusting the water temperature of IRWST.The standard κ-ε model is selected for the turbulence model and the SIMPLEC algorithm is selected for the correction of pressure and speed.The results show that reducing the initial temperature of IRWST can improve the heat exchange performance of PRHR HX.In addition,the initial temperature of IRWST is directly proportional to the average temperature at the tube bundle outlet.Furthermore,the relative temperature drop at the inlet and outlet of the tube bundle increases linearly with the decrease of the initial temperature of IRWST.On this basis,the following research and development directions are prospected,and the following design thought is put forward:after an accident,first increase the IRWST water temperature to reduce the thermal stress damage and fluid vibration of the core components,and then slowly reduce the IRWST water temperature to maintain the heat exchange capacity,so that it not only keeps the integrity of the reactor core,does not damage the reactor core components,but also can maintain the long-term cooling of the reactor core.

关 键 词：非能动余热排出热交换器(PRHR HX) 内置换料水箱(IRWST) 数值模拟 换热能力 长期冷却 

分 类 号：TL33[核科学技术—核技术及应用]