摘要
为研究严重事故条件下对华龙一号非能动安全壳冷却系统(PCS)内部换热器的影响,以华龙一号PCS内部换热器为研究对象,使用商业流体计算软件ANSYS对低浓度氢气燃烧工况及其影响进行了分析。利用西安交通大学的圆柱形实验作为验证实验,证明了选用燃烧模型的正确。选取经验证的氢气燃烧模型对氢气浓度为8%、10%、12%分别进行分析,得到PCS内部换热器换热管表面的最高温度及最大压力分别为676 K与1.95 MPa,并利用得到的温度、压力载荷对PCS内部换热器进行应力分析,按照ASME规范第Ⅲ卷第1分卷NC分册、第1分篇附录进行应力评定校核,结果表明应力水平满足标准的要求。本文研究结果表明,在严重事故下安全壳内浓度为12%的氢气燃烧后不影响PCS内部换热器的安全使用。
In severe accidents,the zirconium water reaction produces a large amount of hydrogen and inevitably releases a large amount of heat.Passive containment cooling system(PCS)internal heat exchanger is a nuclear safety class equipment and an important component of PCS,which could export heat from the containment.Vapor condenses near PCS internal heat exchangers when heat is removed in response to severe incidents.This process leads to an increase in the concentration of hydrogen and air,which increases the possibility of hydrogen combustion near the internal heat exchanger of PCS.Therefore,the commercial fluid calculation software ANSYS was used to conduct hydrogen combustion outside PCS internal heat exchanger and its influence analysis.The hydrogen combustion model was verified by experiment data before use.Liu Yinhe’s cylindrical experiment in Xi’an Jiaotong University was choosed to verify the numerical model of hydrogen combustion.The Fluent module in ANSYS was used to simulate the flame propagation velocity and peak combustion pressure under the initial conditions of 10%initial hydrogen concentration,0.1 MPa initial pressure and 323 K initial temperature.The calculated results are in good agreement with experimental data.Therefore,the hydrogen combustion model selected in this paper can effectively simulate the hydrogen combustion outside PCS internal heat exchanger.The influence of initial hydrogen concentration,convective heat transfer coefficient in heat exchanger tube and tube bundle on thermal characteristics of the heat exchanger was studied by using Fluent module in ANSYS.The initial hydrogen concentration was 8%,10%and 12%.The range of convective heat transfer coefficient in heat exchange tubes was 200-2000 W/(m2·K).The tube bundle consisted of three heat exchange tubes.It is found that the most important factors affecting the thermal characteristics of the heat exchanger are the initial hydrogen concentration and the convective heat transfer coefficient in the heat exchange tube.The static structu
作者
张东
丁铭
邵晓宙
郝晓华
李龙
ZHANG Dong;DING Ming;SHAO Xiaozhou;HAO Xiaohua;LI Long(China Institute for Radiation Protection,Taiyuan 030006,China;Harbin Engineering University,Harbin 150001,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2024年第7期1540-1547,共8页
Atomic Energy Science and Technology
关键词
非能动安全壳冷却系统
内部换热器
氢气燃烧
应力分析
passive containment cooling system
internal heat exchanger
hydrogen combustion
stress analysis
