新型两级气浮旋流设备结构优化与性能研究

Structure Optimization and Performance Study of New Two-stage Air-flotation Cyclone for Oily Water Treatment

为使现有的两级气浮旋流设备作用效果更佳,利用流体分析软件Fluent6.3.26对其进行结构优化和性能研究。研究结果表明,在一定的入口流量下,存在最优一级旋流管径,该管径可使一级油水分离效果最优;两级气浮旋流设备中罐的旋流流场由弯头决定,当弯头的轴向位置离罐底较高时,可使含油污水充分经过气浮作用而得到净化;弯头离轴心的最佳径向位置约为半径的0.36倍,这样可使油水分离性能最佳;当两级气浮旋流设备的最佳入口流速小于2 m/s时,可使油水分离性能最优。现场试验结果表明,新型两级气浮旋流设备能将污水中含油体积分数降到20.00×10^(-6)以下,说明新型两级气浮旋流设备能够进行有效的污水处理,这对我国自主研发气浮旋流处理含油污水技术具有积极的促进作用。

To improve the separation performance of the current two-stage air-flotation cyclone,structure optimization and performance study have been conducted by using fluid analysis software Fluent6. 3. 26. The results show that the optimal one-stage cyclone pipe diameter could be attained at certain inlet flow to achieve optimal oilwater separation. The cyclone flow field in a two-stage air-flotation cyclone is determined by the bend. A higher bend axial position from the bottom of the tank could achieve a better separation performance by fully air-flotation. The optimal radial position of bend is about 0. 36 times the tank radius. The optimal inlet flow rate is less than 2 m / s.Field test results show that the new two-stage air-flotation cyclone could reduce the oil volume fraction to 20. 00 ×10^(-6),presenting an effective wastewater treatment. The study results provide positive effects on independent development of air-flotation cyclone for oily water treatment.