应用CFD方法分析球填料旋转床内气相流动特征

CFD Analysis of Gas Flow in a Rotating Ball-Packed Bed

旋转填充床(RPB)作为一种新型设备,在分离与快速反应方面有着突出的优势。作者建立了球填料旋转床三维CFD模型,分别采用Standardk-?与Realizablek-?湍动模型对气相流动特性进行了模拟研究。结果表明,压降的模拟值与实验值吻合良好,进而获得湍流模型适宜的操作范围;气量增大,径向速度、内外空腔压降及湍动能升高,而气相平均停留时间减小;转速增大,则切向速度、填料区压降与湍动能增高,但气相平均停留时间变化不大。

Rotating packed bed（RPB） has great advantages in separation and rapid reaction applications. In this work, a three-dimensional CFD model of rotating ball packed bed was developed, and Standard k-ε and Realizable k-ε turbulence models were used to investigate gas flow in RPB. The simulated pressure drop results agreed well with experimental data, and an appropriate turbulent model was proposed under various operating conditions. The results show that radial velocity, pressure drop in inner or outer cavity and turbulent kinetic energy are positively correlated with gas flow rate, while the mean residence time is inversely proportional to gas flow rate. Tangential velocity, pressure drop in packing zone and turbulent kinetic energy increase with the increase of rotational speed with almost no change of mean residence time.