高温FLiBe熔盐颗粒粒径分布特征研究  

Study on the particle size distribution of high temperature FLiBe molten salt

作　　者：刘立志 付海英[1] 刘忠英[1] 马继飞[1] 杜林[1] 唐晓星[1] 钱渊[1] 姚剑[1] 李玉兰[1] LIU Lizhi;FU Haiying;LIU Zhongying;MA Jifei;DU Lin;TANG Xiaoxing;QIAN Yuan;YAO Jian;LI Yulan(Key Laboratory of Interfacial Physics and Technology,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所微观界面物理与探测重点实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2020年第10期89-94,共6页Nuclear Techniques

基　　金：国家自然科学基金(No.11705267);王宽诚教育基金(No.GJTD-2018-10)资助。

摘　　要：含铍熔盐有很强的化学毒性,为了实现对高温含铍熔盐颗粒的准确监测和有效去除,了解其粒径分布特征是解决问题的关键。基于熔盐减压蒸馏实验装置和低压冲击采样器,搭建了用于测量高温熔盐颗粒粒径的实验装置,并研究不同实验工况下FLiBe熔盐的粒径分布。实验结果表明:常温下熔盐颗粒粒径分布集中在2.5μm以上;而高温(930℃)下则集中在0.26~2.5μm。同时研究了高温实验工况下,气体吹扫和采样时间对熔盐颗粒粒径分布的影响。研究结果表明:采样时间并未对粒径分布产生明显影响;而气体吹扫虽然改变了最终熔盐颗粒的排放浓度,但未对粒径分布产生显著影响。样品扫描电镜结果验证了实验装置粒径刻度的准确性,而观测到熔盐颗粒呈规则的球形而非晶体状这一现象,推测是由熔盐颗粒碰撞沉积导致。[Background]Beryllium bearing molten salt has strong chemical toxicity,hence needs to be accurately monitored and effectively removed at high temperature.[Purpose]This study aims at the characteristics of particle size distribution of high temperature FLiBe molten salt.[Methods]Based on the experimental device of low pressure distillation of molten salt and Dekati low pressure impact sampler(DLPI),an experimental device for measuring the particle size of high temperature molten salt particles was set up,and the particle size distribution of FLiBe molten salt under different experimental conditions was studied.The effect of gas purging and different sampling time on the particle size distribution of molten salt particles under high temperature were investigated,and scanning electron microscope(SEM)was employed to examine the experimental measurement results.[Results&Conclusions]The experimental results show that the particle size of the molten salt particles is concentrated above 2.5μm at room temperature,while at high temperature,it is concentrated at 0.26~2.5μm.The sampling time has no obvious influence on the particle size distribution of molten salt particles;although the final concentration of molten salt particles is changed by gas purging,it does not significantly affect the particle size distribution.The SEM results of the collected samples verify the accuracy of the particle size scale of the experimental device,and it is observed by SEM that the molten salt particles are in the shape of regular spherical rather than crystalline,which may be caused by the collision and deposition of molten salt particles.

关 键 词：钍基熔盐堆 FLIBE 高温熔盐 粒径分布 

分 类 号：TL99[核科学技术—核技术及应用]