摘要
液态铅铋合金在流动中产生的不溶性颗粒物会在流道内局部聚集,影响铅铋快堆的运行。利用ANSYS软件对小型自然循环铅冷快堆SNCLFR-100棒束通道中颗粒物沉积进行了数值模拟计算,得到颗粒物的沉积运动情况;基于灰色理论,得到颗粒物种类、颗粒物粒径、颗粒物速度对颗粒物沉积的影响。结果表明:通道内颗粒物沉积主要发生在入口阶段,进口段表面为大面积附着沉积,在中段及后段表面为点状沉积;随着轴向距离的加大,湍动能大小是影响颗粒物径向分布的主要因素;颗粒物密度以及粒径的增大会加强颗粒物的沉积;颗粒物速度的增大会降低颗粒物的沉积;对颗粒物沉积的影响程度大小为粒径>种类>速度。
[Background]In the international fourth-generation nuclear power system,the lead-bismuth fast reactor is one of the most concerned technologies.However,insoluble particulate matter generated in the flow of liquid lead-bismuth alloys will collect locally in the flow channel and affect the operation of lead-bismuth fast reactors.[Purpose]This study aims to find the motion deposition of particulate matter in the flow channel,understand its influence on the safe operation of small lead-bismuth fast reactors,and provide a reference for the safe design of lead-bismuth reactors.[Methods]Firstly,based on the design scheme of 100 MWth small natural circulation lead cooled fast reactor SNCLFR-100,the particle deposition in the rod bundle channels that were divided into three types according to the relative position and wall conditions:triangle like channels,pentagon like channels and trapezoid like channels,was numerically simulated using ANSYS software,and the particle deposition movement was obtained.Then,the effects of particle type,particle size and particle velocity on particle deposition were obtained on the basis of grey correlation degree theory.Finally,the correlation degree of various factors affecting particle deposition rate was analyzed.[Results]The results show that the particle deposition mainly occurs at the inlet stage,the surface of the inlet section is large area adhesion deposition,and the surface of the middle and rear sections is point-like deposition.With the increase of axial distance,the magnitude of turbulent kinetic energy is the main factor affecting the radial distribution of particulate matter.The increase of particle density and particle size will strengthen the deposition of particulate matter.The increase of particle velocity will reduce the particle deposition.The degree of influence on particle deposition is particle size>type>particle velocity.[Conclusions]During the operation of lead-bismuth fast reactor,attention should be paid to the deposition of particles in the inlet section and to
作者
周涛
唐剑宇
蒋屹
ZHOU Tao;TANG Jianyu;JIANG Yi(Department of Nuclear Science and Technology,School of Energy and Environment,Southeast University,Nanjing 210096,China;Institute of Nuclear Thermal-hydraulic Safety and Standardization,Nanjing 210096,China;National Engineering Research Center of Power Generation Control and Safety,Nanjing 210096,China;School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China)
出处
《核技术》
CAS
CSCD
北大核心
2023年第7期101-110,共10页
Nuclear Techniques
基金
江苏省双创人才(No.JSSCR2021500)
国家重点研发计划重点专项(No.2020YFB1901700)资助。
关键词
铅铋快堆
棒束通道
颗粒物
沉积
灰色关联度
Lead-bismuth fast reactor
Rod bundle channel
Particulate matter
Deposit
Grey correlation degree
