颗粒-壁面相互作用对石墨粉尘在高温气冷堆蒸汽发生器换热管表面沉积过程的影响  

Effect of Particle-wall Interaction on Graphite Dust Deposition on HTGR Steam Generator Tube

作　　者：魏明哲[1] 张易阳[1] 吴莘馨[1] 雒晓卫[1] 

机构地区：[1]清华大学核能与新能源技术研究院,先进核能技术协同创新中心,先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《原子能科学技术》2016年第8期1369-1374,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金青年科学基金资助项目(51406097);清华大学自主科研计划资助项目(20151080381)

摘　　要：石墨粉尘在高温气冷堆蒸汽发生器换热管表面的沉积直接影响一回路放射性分布,因而备受学界和业界的关注。本文采用临界粘附速度模型研究石墨粉尘颗粒的碰壁过程,并将其耦合入蒸汽发生器一次侧的气固两相流模拟计算中,得到了石墨粉尘颗粒在换热管束间的输运和沉积规律。结果表明,考虑颗粒-壁面相互作用后,石墨颗粒沉积率显著减小,其与粒径的关系也有所不同。沉积率随粒径的增大先增大后减小,最大沉积率对应粒径约3μm。空间分布规律上,小颗粒迎风第1排管沉积率相对最大,2μm以上颗粒最大沉积率发生在第4-6排管。The deposition of graphite dust on steam generator（SG）tubes is a highly concerned issue for operation and maintenance of high-temperature gas-cooled reactor（HTGR）,as the distribution of radioactivity is directly affected.In this paper,the computational fluid dynamics（CFD）study on graphite dust deposition on SG tubes was presented,with emphasis of the particle-wall interaction.From a view of kinetic energy dissipation,a critical capture velocity model was adopted to account for particle-wall collisions and incorporated into CFD simulation.The results show that the hit-and-stick assumption significantly overestimates the deposition rate of graphite dusts. With reasonable consideration of particle rebound,the deposition rate first increases thendecreases with particle diameter increasing,showing a maximum at 3μm.The analysis of spatial distribution indicates that largest deposition rates appear on middle rows of tubes.

关 键 词：高温气冷堆 石墨粉尘 沉积 蒸汽发生器换热管 颗粒-壁面相互作用 

分 类 号：TL33[核科学技术—核技术及应用]