双锥旋流分离器内固-液分离过程的数值模拟

Numerical Simulation of Solid-Liquid Separation Process in Dual-cone Hydrocyclone

为了进一步认识双锥旋流分离器的固-液分离过程．利用基于计算流体动力学的多相流模型对直径100mm双锥旋流分离器内粒径为5~50μm的颗粒的分离过程进行数值模拟．比较模拟所得颗粒的分离效率与实验结果的一致性。结果表明：粒径为5μm的颗粒进入内旋流后紧靠空气芯快速上升；粒径为25μm的颗粒进入内旋流后上升速度较慢，且在上升过程中逐渐远离空气芯；粒径为50μm的颗粒偶有进入内旋流的现象，但最终仍从底流排出；颗粒在分离器内的分布规律是．颗粒越小越趋向于分布于整个分离器内，随着粒径的增大，颗粒的分布先后出现浓度偏移及空间偏移，颗粒越大越趋向于分布于壁面附近及锥底部分。

To further understand the solid-liquid separation process in the dual-cone hydrocyclone, the separation of particles with size from 5 to 50 μm in the dual-cone hydrocyclone with diameter of 100 mm was simulated, based on the multiphase model of computational fluid dynamics. The simulated particle separation efficiency and the laboratory results were compared. The results show that after entering into the inner swirl, the 5 μm particles go up quickly with the particles flow closely surrounding the air core. The upward velocity of the 25 μm particles in the inner swirl is slower than that of the 5 μm particles and they gradually flow away from the air core. The 50 μm particles enter into the inner swirl occasionally. However, they flow out with the underflow finally. Distribution of particles in the separator indicate that the smaller particles tend to distribute throughout the separator. With the increase of the particle size, the particle concentration and spatial aggregation occur successively. And the larger particles are more likely to distribute in the near wall region and the bottom of the cone.