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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。
The computational fluid dynamics (CFD) simulation of the gas-solid two-phase flow field in the deposition chamber was performed by means of the Euler-Euler method. The steady state simulation of the reduction reaction product was carried out by means of the HSC Chemistry software. The calculation results of the reduction reaction and the flow field distribution The results of the calculation are combined to obtain the velocity field and component concentration field in the deposition chamber. The results show that the distribution of fuel particles in the deposition chamber is not uniform and local particles accumulate in the deposition chamber. The adhesion of the bed material may be caused by the viscous force caused by the melting of the niobium chloride which is a by-product of the reduction reaction. The reaction rate And Nb Cl5 flow inhomogeneities led to a substantial increase in the amount of by-product formation, thereby promoting the bonding of the bed material.