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为研究三角形螺旋填料旋转床内部流场的复杂流动,建立了正三角形结构的填料物理模型来描述实际的三角形螺旋填料,并基于Gambit-Fluent的计算平台,采用realizable k-ε湍流模型对逆流旋转填料床进行气相干床压降的计算流体力学(CFD)模拟。结果表明:正三角形填料模型比较符合大比表面积,高空隙率的三角形螺旋填料的实际情况;气相在填料表面剧烈湍动,对强化传质极为有利;不同气体流量和转速下的正三角形填料旋转床气相干床压降的CFD模拟值与三角形螺旋填料床气相干床压降的实验值较吻合,两者的平均相对误差为15.8%。
In order to study the complex flow field inside the rotating bed of triangular helical packing, a physical model of filler with an equilateral triangular structure was established to describe the actual triangular helical packing. Based on the Gambit-Fluent calculation platform, a realizable k-ε turbulence model was adopted to counter- CFD simulations of bed pressure drop in packed beds. The results show that the equilateral triangular packing model conforms to the actual situation of the triangular spiral packing with large specific surface area and high porosity. The gas phase is intense turbulent on the packing surface, which is very beneficial to the enhanced mass transfer. The equiaxial packing rotation under different gas flow rates and rotating speeds The CFD simulation results of the pressure drop in the gas-bed co-bed are in good agreement with the experimental values of the pressure drop in the gas-coke bed of the triangular screw packed bed. The average relative error between them is 15.8%.