滤网对颗粒捕集过程的微观实验
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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 showthat 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.
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 showthat 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.
引文
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[9]Huang H K,Zheng C,Zhao H,et al.Numerical investigation on non-steady-state filtration of elliptical fibers for submicron particles in the“greenfield gap”range[J].Journal of Aerosol Science,2017,114(sup C):263-275.
[10]Jin X,Yang L,Du X,et al.Modeling filtration performance of elliptical fibers with random distributions[J].Advanced Powder Technology,2017,28(4):1193-1201.
[11]Xu Z L.Filtration mechanism of fine particle,in fundamentals of air cleaning technology and its application in cleanrooms[M].Heidelberg:Springer Berlin Heidelberg,2014:133-183.
[12]Steffens J R,Coury J R.Collection efficiency of fiber filters operating on the removal of nano-sized aerosol particles:II.heterogeneous fibers[J].Separation and Purification Technology,2007,58(1):106-112.
[2]柳静献,毛宁,常德强,等.高密面层结构对针刺毡滤料性能影响的实验研究[J].东北大学学报(自然科学版),2011,32(1):129-132.(Liu Jing-xian,Mao Ning,Chang De-qiang,et al.Experimental study on the effect of high-density surface structure on filtration performance of needle-punched felt[J].Journal of Northeastern University(Natural Science),2011,32(1):129-132.)
[3]Zhou F B,Li J L,Li S H,et al.Experimental investigation and application of dry-type filtering dust collection technology in fully mechanized excavation face[J].Journal of China Coal Society,2017,42(3):639-645.
[4]Song Y,Zhang Y,Dai W.PM2.5 sources and their effects on human health in China:case report[J].Encyclopedia of Environmental Health,DOI:10.1016/B978-0-444052272-6.00067-2.
[5]Sun X W,Pei L C,Lei R,et al.The cumulative effect of air pollutants on the acute exacerbation of COPD in Shanghai,China[J].Science of the Total Environment,2018,622/623:875-881.
[6]Zhang X,Liu J J,Hou Y F,et al.Experimental study on the performance of the air purifier in removing the particulate pollutants[J].Journal of Safety and Environment,2016(5):303-307.
[7]Huang B,Qiang Y,Li S Q,et al.Experimental investigation on the particle capture by a single fiber using microscopic image technique[J].Powder Technology,2006,163(3):125-133.
[8]Alonso M,Alguacil F J,Santos J P,et al.Deposition of ultrafine aerosol particles on wire screens by simultaneous diffusion and image force[J].Journal of Aerosol Science,2007,38(12):1230-1239.
[9]Huang H K,Zheng C,Zhao H,et al.Numerical investigation on non-steady-state filtration of elliptical fibers for submicron particles in the“greenfield gap”range[J].Journal of Aerosol Science,2017,114(sup C):263-275.
[10]Jin X,Yang L,Du X,et al.Modeling filtration performance of elliptical fibers with random distributions[J].Advanced Powder Technology,2017,28(4):1193-1201.
[11]Xu Z L.Filtration mechanism of fine particle,in fundamentals of air cleaning technology and its application in cleanrooms[M].Heidelberg:Springer Berlin Heidelberg,2014:133-183.
[12]Steffens J R,Coury J R.Collection efficiency of fiber filters operating on the removal of nano-sized aerosol particles:II.heterogeneous fibers[J].Separation and Purification Technology,2007,58(1):106-112.