Enhancement of fine particle filtration with efficient humidification  

作　　者：Yumei Zhang Weidong Zhang Zhengyu Yang Junteng Liu Fushen Yang Ning Li Le Du 

机构地区：[1]The State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Membrane Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China

出　　处：《Chinese Journal of Chemical Engineering》2016年第4期453-459,共7页中国化学工程学报（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China(863 Program)(No.2013AA065003);the National Natural Science Foundation of China(No.21276011);the Ph.D.Programs Foundation of Ministry of Education of China(200800100001)

摘　　要：Filtration is one of the most effective methods to remove suspended fine particles from air. In filtration processes,pressure drop of compact dust cake causes problems in efficiency and economy, which has received increasing attention and still remains challenging. In this study, we developed a novel technique to intensify the filtration of fine particles with efficient humidification. Two strategies for humidification, including ultrasonic atomization and steam humidification(controlling of ambient humidity), were employed and proved to be both effective. The regeneration frequency of the filter could be reduced by 55% with ultrasonic atomization, while steam humidification could lead to a 78% reduction in regeneration frequency. The effect of operating conditions on pressure drop and the mass loading during filtration were investigated. The dust cake showed a loose and porous structure with an optimized droplet-to-particle ratio. With the ratio of 1.53 and 0.0282, the maximum mass loading was 552 g·m-2upon the ultrasonic atomization and 720 g·m-2upon the steam humidification. The results show that humidification could slow down the increase of pressure drop during filtration and improve the efficiency of process.Filtration is one of the most effective methods to remove suspended fine particles from air. In filtration processes, pressure drop of compact dust cake causes problems in efficiency and economy, which has received increasing at- tention and still remains challenging. In this study, we developed a novel technique to intensify the filtration of fine particles with efficient humidification. Two strategies for humidification, including ultrasonic atomization and steam humidification （controlling of ambient humidity）, were employed and proved to be both effective. The re- generation frequency of the filter could be reduced by 55% with ultrasonic atomization, while steam humidification could lead to a 78% reduction in regeneration frequency. The effect of operating conditions on pressure drop and the mass loading during filtration were investigated. The dust cake showed a loose and porous structure with an opti- mized droplet-to-particle ratio. With the ratio of 1.53 and 0.0282, the maximum mass loading was 552 g·m^-2 upon the ultrasonic atomization and 720 g. m 2 upon the steam humidification. The results show that humidification could slow down the increase of pressure drop during filtration and improve the efficiency of process.

关 键 词：FiltrationHumidificationLiquid bridgePressure dropDust cake structure 

分 类 号：TQ028.26[化学工程]