操作参数和滤材结构对纤维滤材油-水聚结分离性能的影响

Influence of Operating Parameters and Filter Material Structure on the Oil-Water Coalescence and Separation Performance

为提高纤维滤材对油-水聚结分离性能,搭建油-水聚结分离性能测试装置,探究含油量和过滤速率协同、纤维滤材层数以及孔径等操作参数和滤材结构对水包油乳液聚结分离性能以及液体分布影响。研究结果表明,单层平均孔径15.1μm聚丙烯纤维滤材在过滤速率0.001 m/s、含油量1000 mg/L的条件下可获得最高80.2%的除油效率、最大0.96的品质因子。当含油量相同时,滤材的饱和度与过滤速率呈反比;过滤速率相同时,滤材的饱和度和含油量呈正比。滤材品质因子随着纤维滤材(平均孔径15.1μm)层数由1层增加到5层,其曲线变化趋势为先增大后减小,除油效率可显著提升23.2%,下游平均粒径降低约80.0%。滤材孔径与滤材效率和品质因子呈反比,在过滤速率0.001 m/s、含油量100 mg/L的条件下,随平均孔径从15.1μm增加到21.6μm,滤材的除油效率从67.1%下降到31.2%,品质因子从0.64下降到0.35。纤维滤材表面液体分布和内部持液量分析表明,油相主要聚集在滤材上半部分,沿流动方向滤材内部可能存在厚薄不均匀的油膜。

To improve the oil-water coalescence and separation performance of fiber filter materials,an oil-water coalescence and separation performance test device was built to explore the effect of operating parameters such as oil content and filtration rate synergy,fiber filter material layers and pore size,as well as filter material structure on oil in water lotion coalescence and separation performance and liquid distribution.The research results indicate that the polypropylene fiber filter material with the average pore size of 15.1μm for a single layer can achieve a maximum oil removal efficiency of 80.2%and a maximum quality factor of 0.96 under the filtration rate of 0.001 m/s and oil content of 1000 mg/L.When the oil content is the same,the saturation of the filter material is inversely proportional to the filtration rate;when the filtration rate is the same,the saturation of the filter material is directly proportional to the oil content.The quality factor of filter material varies with the increasing number of layers from 1 to 5 in fiber filter material(average pore size 15.1μm),of which the curve shows a trend of first increasing and then decreasing.The oil removal efficiency can be significantly improved by 23.2%,and the downstream average particle size can be reduced by about 80.0%.The pore size of the filter material is inversely proportional to its filtration efficiency and quality factor.Under the filtration rate of 0.001 m/s and oil content of 100 mg/L,the average pore size increases from 15.1μm to 21.6μm,the oil removal efficiency of the filter material decreases from 67.1%to 31.2%,and the quality factor decreases from 0.64 to 0.35.The analysis of liquid distribution on the surface and internal liquid holding capacity of the fiber filter material shows that the oil phase mainly accumulates in the upper part of filter material,and there may be uneven oil film thickness in filter material along the flow direction.