高海拔地区水力旋流器旋液分离过程CFD模拟与结构优化

CFD Simulation and Structure Optimization of the Hydrocyclone Separation Process in High Altitude Areas

针对氯化钾冷结晶器溢流液分离问题,提出使用水力旋流器进行固液分离。采用CFD数值模拟方法对水力旋流器的分离过程进行计算,研究在高海拔地区下水力旋流器筒径、溢流口直径、入口流速、锥角等因素对其流动特性和分离性能的影响。结果表明:筒径Dc=200 mm时分离效果最好;溢流口直径d0的增大会使分离效率与压降减小;增大入口流速会使分离效率先上升再下降,且压降随入口流速增大而增大;锥角α减小,水力旋流器分离效率增加并且压降减小,海拔高度的改变基本不改变水力旋流器的分离效率与压降。经分析可知:当D_(c)=200 mm、d_(0)=56 mm、α=10°、入口流速为9 m/s时,粒径在20μm以上的颗粒分离效率可以达到80%以上,此时压降为0.26 MPa,整体性能最好。

Aiming at separating overflow fluids in potassium chloride cold crystallizer,making use of a hydrocyclone for solid-liquid separation was proposed,including employing CFD simulation method to calculate hydrocyclone’s separation process and investigat the effects of hydrocyclone’s cylinder diameter,overflow port diameter,inlet flow rate and cone angle on the flow characteristics and separation performance at high altitude areas.The results show that,as for a 200 mm cylinder diameter,the separation effect becomes best;and increasing the overflow port diameter will reduce separation efficiency and pressure drop;raising the inlet flow rate will make separation efficiency rise first and then become decreased and the pressure drop will increase with the increase of the inlet flow rate;the cone angle decreases,the hydrocyclone’s separation efficiency becomes increased and the pressure drop decreased.The altitude’s variation doesn’t change hydrocyclone’s separation efficiency and pressure drop.Analysis results show that,when the structural parameters are D_(c)=200 mm,d_(0)=56 mm,cone angleα=10°,and inlet flow rate is 9 m/s.When the particle size is more than 20μm,the separation efficiency can reach more than 80%together with a 0.26 MPa pressure drop,the overall performance becomes best.