摘要
由于滤网具有良好的颗粒捕集性能而被广泛应用于工业或民用领域,但对其微观捕集机理研究尚且有限.本文通过建立一套显微观测系统真实记录滤网捕集颗粒的全过程,研究其在捕集颗粒过程中的微观表现,分析影响单纤维过滤及滤网网孔架桥堵塞的影响因素.结果表明随着过滤风速的减小,滤网的未堵塞孔面积与孔总面积之比逐渐降低,且最终会出现一个稳定状态;而随着滤网孔径的减小,该比值逐渐降低.在实际使用过程中应根据具体使用条件合理选择过滤风速和滤网孔径,对于长时间使用的滤网应及时清灰避免二次污染.
Due to its good particles trapping properties,filter screen is widely used in industrial or civil fields.However,the research on its micro-capture mechanism is still limited.In this paper,a set of microscopic observation system was set up to record the whole process of filter screen trapping particles.The microscopic performance of the process of particles trapping was studied.The influencing factors that affect single fiber filtration and mesh bridging blockage were analyzed.The results show that with the increase of filtration velocity,the ratio of unblocked pore area to total pore area gradually decreases,and eventually a stable state will appear.With the increase of mesh number,the ratio gradually decreases.In the actual application,the filtration velocity and filter screen pore size should be properly selected according to the specific conditions of use.The filter screen should be cleaned in time to avoid secondary pollution.
作者
余振辉
柳静献
初砚昊
田鹏
YU Zhen-hui;LIU Jing-xian;CHU Yan-hao;TIAN Peng(School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China)
出处
《东北大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2019年第3期430-434,446,共6页
Journal of Northeastern University(Natural Science)
基金
国家十三五重大专项(2017YFC0211801
2016YFC0801704
2016YFC0203701
2016YFC0801605)
国家十二五科技支撑项目(2015BAK40B02)
关键词
滤网
捕集机理
显微观测
架桥
网孔堵塞
filter screen
trapping mechanism
microscopic observation
bridging
mesh blockage