Influence of Operating Parameters and Filter Material Structure on the Oil-Water Coalescence and Separation Performance
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 15.1 μm 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 15.1 μm),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 15.1 μm to 21.6 μm,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.
coalescence separationfiltering speedfilter material structureoil in waterliquid distribution
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