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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）。
Author NameAffiliationPostcode
ZHANG Tao* State Key Lab of Clean and Efficient Coal-fired Power Generation and Pollution Control， Nanjing， Jiangsu Province， 210023 210023
LIU Sihan School of Light Industry and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
ZHOU Zhiqiang School of Light Industry and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
ZHOU Hao State Key Lab of Clean and Efficient Coal-fired Power Generation and Pollution Control， Nanjing， Jiangsu Province， 210023 210023
SUN Zhaoxia School of Light Industry and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LIANG Yun* School of Light Industry and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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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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