核燃料颗粒涂铌沉积室内流态化与CVD反应的耦合数值模拟研究  

Coupled Numerical Simulation of Nuclear Fuel Particles Fluidization and CVD Reaction in Deposition Chamber for Niobium Coating

作　　者：李统业[1] 王辉[1] 陈建华[2] 潘小强[1] 

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,成都610041 [2]中国科学院过程工程研究所,北京100190

出　　处：《核动力工程》2016年第1期52-56,共5页Nuclear Power Engineering

基　　金：武器装备预研基金重点项目(9140C700101130C70018);中核预研基金项目(416031102)

摘　　要：利用Euler-Euler方法对沉积室内的气固两相流场进行计算流体力学(CFD)模拟计算,利用HSC Chemistry软件对还原反应产物进行稳态模拟计算,并将还原反应的计算结果与流场分布的计算结果相结合,拟合得到沉积室内的速度场和组分浓度场。研究结果表明,沉积室内燃料颗粒分布不均匀,在沉积室内存在局部颗粒堆积现象;床料粘结现象可能是由于还原反应副产物低价氯化铌的熔化产生的粘性力引起,沉积室内反应速率及Nb Cl5流量的不均匀性导致副产物生成量大幅提高,进而促进床料的粘结。In order to study the agglomeration mechanism, the gas-solid flow field in the deposition chamber was numerically studied by Euler-Euler method, and the steady-state reduction reaction products were simulated by HSC Chemistry. Combined the flow field distribution and reduction reaction simulation, the velocity and component concentration fields in the deposition chamber were obtained. The results showed that both the gas-solid flow fields and reaction products concentration fields in the deposition chamber were not uniform, and local particle accumulation phenomenon in deposition chamber cone section was found. The bed agglomeration can be attributed to the melting of the low valence niobium chloride produced by reduction reaction The reaction rate and NbC15 flow non-uniformity can lead to the low valence niobium chloride generation increases significantly, which can promote the bed agglomeration.

关 键 词：核燃料 颗粒涂铌 气固两相流 计算流体力学(CFD) 化学气相沉积(CVD) 

分 类 号：TL21[核科学技术—核燃料循环与材料]