Abstract:

In order to explore influences of nanofibers on the gas-liquid filtration performance of composite filters, polyacrylonitrile (PAN) nanofibrous 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 increase then decrease, 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.

Key words: electrospinning, polyacrylonitrile, composite filter, filtration performance, nanofiber