轻质分散相水力旋流器的分割尺寸

Theoretical prediction of the cut size of hydrocyclones separating light dispersions

轻质分散相水力旋流器在食用油的提炼、奶品脱脂、果汁浓缩等农副产品加工以及废水回用于农田水利的过程中有着广泛的应用前景。该文根据旋流器的分离效率模型计算并关联了轻质分散相水力旋流器的分割尺寸 d50 ,可作为衡量旋流器分离能力的标志。得到的结果可适用于不同的流体流量、不同的分流比、不同的流体物性参数以及不同尺寸关系的旋流器。根据计算结果 ,分流比对分割尺寸的影响比较小 ,半锥角、溢流口尺寸与底流口尺寸对分割尺寸的影响比较大。旋流器大小、流体的流量以及物性参数对旋流器分割尺寸的影响比较直接 ,当旋流器尺寸 R0 、流量以及物性参数变化时 ,分割尺寸的改变遵循旋流器数不变的规律。由于分割尺寸与 R0 的平方根成正比 ,所以旋流器尺寸越小 ,分割尺寸也越小 ,因此旋流器的分离能力也就越大。

Light dispersion hydrocyclones can find their wide applications in the agricultural product processing such as abstraction of edible oil, degreasing milk, concentration of fruit juice, etc. and in the process of recovery of irrigating water from town wastewater. Based on the previously developed migration probability model for single cone light dispersion hydrocyclones, the cut size d 50 was theoretically predicted and correlated to the hydrocyclone number. The results can be used to compare the separating capacities of different hydrocyclones with different structural parameters under different split ratios, flow rates and fluid properties. It is indicated that the split ratio has a relative small effect on the cutting size while the semi cone angle and sizes of overflow and underflow orifices have very large effects. The hydrocyclone radius R 0, the flow rate and the fluid properties affect the cut size d 50 in such a way that the hydrocyclone number will keep constant when these parameters vary. The separating capacity of a hydrocyclone will increase with decreasing R 0 as the cut size is proportional to the square root of R 0.