In order to explore influences of nanofibers on the gas-liquid filtration performance of composite filters, polyacrylonitrile ( PAN) nanofibrous filters of 3 layers were prepared by electrospinning method, with different surface density and fiber diameters. Based on the same conditions, the pressure drop, filtration efficiency and quality factor of the composite filters were evaluated experimentally by using liquid aerosol of diethylhexyl sebacate ( DEHS ) . The results show that filtration efficiency and pressure drop of filters increase with increase of surface density when coalescence filtration is steady state. Quality factor of filters in steady state, however, first increases then decreases, and the maximum value is achieved when the surface density of nanofiber layer is 0. 4 g/m2 . In addition, with the decrease of diameter from 706. 5 nm to 520. 1 nm, filtration efficiency and quality factor of filters in steady state increase when surface density of nanofiber layers are equal, which indicates that composite filters with smaller fiber diameter will be more suitable.%为探究纳米纤维物性参数对复合滤材气液过滤性能的影响,利用静电纺丝方法在普通玻璃纤维滤材上制备了聚丙烯腈(PAN)纳米纤维层,以3层堆叠方式得到不同纳米纤维层面密度和纤维直径的复合滤材.在相同实验条件下,以癸二酸二辛酯(DEHS)为实验介质,通过滤材气液过滤性能实验装置分析了不同复合滤材的过滤效率、压降和品质因子.结果表明:复合滤材的稳态过滤效率和压降均随着纳米纤维层面密度的增大而增加,但稳态品质因子呈现先增加后降低的趋势,且在面密度为0.4 g/m2时达到最大值;在面密度相等的条件下,纳米纤维直径由706.5 nm降低到520.1 nm,滤材的稳态过滤效率和品质因子均随着纳米纤维直径的减小而逐渐增加,表明在复合滤材中宜选用纤维直径较小的纳米纤维层.
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