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Dust Holding Performance Against Oil-dust Mixture Particles of Composite Air Filter Material Consisting of Gradient Distributed Ultrafine Fibers |
Received:January 19, 2022 |
DOI:10.11980/j.issn.0254-508X.2022.10.005 |
Key Words:composite air filter material gradient structure filtration efficiency DEHS-A2 mixture dust dust holding capacity pressure drop |
Fund Project:国家环境保护大气物理模拟与污染控制重点实验室开放课题(D2020Y004-7)。 |
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Abstract:The composite air filter material consisting of ultrafine fibers that gradient distributed in the thickness direction was fabricated by wet-laid method in this study. Then the filtration efficiency against sodium chloride particles with different size was studied. Moreover, the dust holding capacity (DHC) against pure A2 dust, pure DEHS mist and DEHS-A2 mixture dust was analyzed. The results showed that the most penetrating particle size of the filter material was 100 nm. In addition, the DHC against pure A2 dust and pure DEHS was 92.0 g/m2 and 182.5 g/m2, respectively. The maximum DHC against mixture dust with DEHS content of 20% was 414.7 g/m2. Whereas the minimum DHC against mixture dust with DEHS content of 60% was 84.1 g/m2. While it was still higher than that of commercial melt-blown fibers composite filter material (26.5 g/m2). For the mixture dust with DEHS content of 20%, the pressure drop of the filter material increased slowest with a loose filter cake formed by mixed dust on the surface of the filter material. In addition, the pressure drop increased fastest and the A2 dust was immersed in the DEHS films forming the cakes with “sea-island” structures when the DEHS content was 80%. |
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