摘要
钍基熔盐堆10 MW固态实验堆设计采用活化法测量反应堆内部中子能谱分布,中子活化样品在堆外装载后通过传输装置将其快速输送到堆内测量位置进行辐照,辐照完后将其输出到能谱样品间进行解谱分析,进而获取堆内能谱分布情况。为实现中子能谱样品快速进出反应堆,设计了一种堆内双层套管中子活化样品气力输送系统,采用Fluent仿真方法研究样品在不同管道间隙下的运动规律。采用气力输送理论对原理样机的流量、两相流压损等工作参数进行设计并对原理样机的结果进行对比验证试验。试验结果表明:样品运动速度、气体流量和压损等测量参数与理论设计值符合较好,设计方法可行,双层套管的结构设计可以实现样品顺畅进出堆芯的功能。
[Background]The activation method is taken to measure the in-core distribution of neutron spectrum for the designed 10 MW solid-fuel thorium molten-salt reactor(TMSR-SF1).The neutron activation foil sample is loaded outside the reactor and quickly transported to the measurement position in the reactor through the transmission device for irradiation,and then is transferred outside of reactor to the energy spectrum samples for de-spectrographic analysis.[Purpose]In order to realize the rapid entry and exit of the neutron activation foil sample into and out of the reactor,a pneumatic conveying system with double-layer casing is designed in this research.[Methods]The principle of the conveying system and the structure of the double-casing tube were adopted in this study.ANSYS Fluent software and 6DOF dynamic grid technology were used to analyze the movement and stress of the sample under different pipe gaps,so as to determine the sample pipe gap value.Then the flow parameters and gas-solid two-phase flow resistance of the conveying system were calculated in detail using the pneumatic conveying theory.Finally,a prototype was developed for experiments to verify the principle of the conveying system.[Results]The analysis results showed that the sample speed is decreased with the increase of the pipe gap.The experiments results show that the velocity of the sample and the pressure loss of the gas-solid two-phase flow increase with the increase of the gas flow rate.Under the same flow rate,the experimental speed of the sample movement and the pressure loss of the gas-solid two-phase flow are in good agreement with the theoretical calculations.[Conclusions]The pneumatic convey system with double-casing tube can be applied to transport the sample into and out of the reactor,and the theoretical calculations values of pneumatic conveying parameters in this study are reliable.
作者
胡瑞荣
王纳秀
徐博
张宏新
李玲
曹云
朱世峰
HU Ruirong;WANG Naxiu;XU Bo;ZHANG Hongxin;LI Ling;CAO Yun;ZHU Shifeng(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《核技术》
CAS
CSCD
北大核心
2023年第2期84-92,共9页
Nuclear Techniques
基金
中国科学院战略先导科技专项(No.XDA0201002)资助。
关键词
活化法
中子能谱样品
气力输送
双层套管
气固两相流
Activation method
Neutron spectroscopy sample
Pneumatic conveying
Double-casing tube
Gas-solid flow
