电晕驻极滤袋对荷电微细颗粒物捕集效率

Abstract
Figure/Table
References
Related Citation (8)

Download: PDF (1103 KB) HTML (0 KB)
Export: BibTeX | EndNote (RIS)

Abstract In this study, the bag filters were charged by single needle corona discharge with negative DC power supply, and a hybrid electrostatic filter comprised of pre-charger and electret bag filter were designed and manufactured. The collection efficiency of electret bag filter for uncharged, positively charged, negatively charged and bipolarly charged particles (0.3~10μm) were systematically studied, and the stability of collection efficiency for particles with different charge types were compared under different flow velocity conditions. Compared to raw bag filter for capturing neutral particles, the collection efficiency of electret bag filter for charged particles was higher. Especially for the particles with a size of 0.3μm, the collection efficiency increased from 79.9% to 99.9% (positive charge), 99.3% (negative charge) and 98.6% (bipolar charge), respectively. The electrostatic collection efficiency compensates for the reduction of mechanical collection efficiency with the increase of flow velocity. For the 0.3μm particles, the decrement of collection efficiency decreased from 9.4% (neutral) to 0.06% (positive charge), 0.2% (negative charge) and 5.2% (bipolar charge), respectively. More specifically, the enhancement of collection efficiency by coulomb attraction was stronger than that by coulomb repulsion, and both were superior to the agglomeration behavior. Three filter cake models were inferred by SEM to systematically explain this experimental phenomenon. These findings are very important for further studying the combination of electrostatic and mechanical collection mechanism of bag filter for fine particulate matter.

Key words： electret bag filter fine particulate matter charging collection efficiency filter cake

Received: 23 June 2023

PACS:

X513

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LYU Chao
	YANG Xiao-chuan
	ZHU Mian
	LIU Jing-xian

Cite this article:

LYU Chao,YANG Xiao-chuan,ZHU Mian等. Collection efficiency of electret bag filter for charged fine particulate matter[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 663-669.

URL:

http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I2/663

[1]	柳静献,毛宁,孙熙,等.我国除尘滤料历史、现状与发展趋势综述[J]. 中国环保产业, 2020,(11):6. Liu J X, Mao N, Sun X, et al. Review of the history, current situation and development trend of filter materials for dust removal in China [J]. China environmental protection industry, 2020,(11):6.
[2]	Chikao K. Fine particle filtration technology using fiber as dust collection medium [J]. KONA Powder and Particle Journal, 2019,6:88-113.
[3]	高涵超,张苏广,夏兆鹏,等.空气过滤用驻极体纤维材料研究进展[J]. 高分子材料科学与工程, 2023,39(4):173-181. Gao H C, Zhang S G, Xia Z P, et al. Progress of electret fibrous membranes for air filtration [J]. Polymer Materials Science and Engineering, 2023,39(4):173-181.
[4]	梁幸幸,杨颖,许德平.静电纺丝法制备空气过滤膜及应用[J]. 化学工业与工程, 2015,32(3):59-67. Liang X X, Yang Y, Xu D P. Preparation and application of air filtration membrane by electrospinning [J]. Chemical Industry and Engineering, 2015,32(3):59-67.
[5]	卢晨,刘力,王洪.非织造驻极体电荷稳定性及驻极方法研究现状[J]. 化工新型材料, 2022,50(1):62-65. Lu C, Liu L, Wang H. Research status of charge stability and charging method of nonwoven electret [J]. New Chemical Materials, 2022, 50(1):62-65.
[6]	钱幺,吴波伟,钱晓明.驻极体纤维过滤材料研究进展[J]. 化工新型材料, 2021,49(6):42-46. Qian Y, Wu W B, Qian X M. Research progress of electret fiber filter materials [J]. New Chemical Materials, 2021,49(6):42-46.
[7]	赫伟东,郭颖赫,常德强,等.袋除尘滤料电晕驻极强化研究[J]. 东北大学学报(自然科学版), 2018,39(10):1469-1473,1479. He W D, Guo Y H, Chang D Q, et al. Enhancement of baghouse filter with corona electret [J]. Journal of Northeastern University (Natural Science), 2018,39(10):1469-1473,1479.
[8]	吕超,柳静献,孙熙,等.燃煤飞灰单极荷电对纤维滤料过滤性能的强化[J]. 东北大学学报(自然科学版), 2021,42(9):1335-1340. Lyu C, Liu J X, Sun X, et al. Enhancement of filtration performance of fibrous filter for unipolarly charged coal-fired fly ash [J]. Journal of Northeastern University (Natural Science), 2021,42(9):1335-1340.
[9]	李雪娥,向晓东,李梦玲,等.双极电袋复合除尘器的增效减阻效应[J]. 环境工程学报, 2019,13(1):141-146. Li X E, Xiang X D, Li M L, et al. Efficiency enhancement and drag reduction effects of bipolar electrostatic bag filter [J]. Chinese Journal of Environmental Engineering, 2019,13(1):141-146.
[10]	Lv C, Li G D, Shen R Q, et al. Study on electric agglomeration of bipolar charged coal fired fly ash particles and its effect on filtration performance of fibrous filter [J]. Clean Technologies and Environmental Policy, 2023,25:1887-1901.
[11]	菅义夫.静电手册[M]. 北京:科学出版社, 1981. Suge Y. Electrostatic handbook [M]. Beijing:Science Press, 1981.
[12]	陈斌,项深泽.纤维过滤材料过滤气体机理及其应用[J]. 化学工程与装备, 2009,153(10):140-141. Chen B, Xiang S Z. Mechanism and application of fiber filter materials in gas filtration [J]. Chemical Engineering and Equipment, 2009,153(10):140-141.
[13]	Snaddon R W L. Electrically enhanced collection of respirable aerosols in granular bed filters at low Reynolds numbers [J]. IEEE Transactions on Industry Applications, 1985,21(2):501-506.
[14]	Shapiro M, Laufer G, Gutfinger C. Electrostatically enhanced granular bed filters [J]. Aerosol Science and Technology, 1986,5(1):39-54.
[15]	Ren J Y, Yan X S, Zhang L D, et al. Filtration of submicron dust by a dual-layer granular bed filter with an external electric field [J]. Environmental Science and Pollution Research, 2021,28:48967-48983.
[16]	Brown R C. Air filtration [M]. Oxford:Pergamon Press, 1993.
[17]	余振辉,柳静献,初砚昊,等.滤网对颗粒捕集过程的微观实验[J]. 东北大学学报(自然科学版), 2019,40(3):430-434. Yu Z H, Liu J X, Chu Y H, et al. Microsopic experiment of particle trapping process for filter screen [J]. Journal of Northeastern University (Natural Science), 2019,40(3):430-434.
[18]	Chang Q, Zheng C, Yang Z, et al. Electric agglomeration modes of coal-fired fly-ash particles with water droplet humidification [J]. Fuel, 2017,200:134-145.