Performance of N95 elastomeric respirators in high humidity and high coal dust concentration environment  

作　　者：Jintuo Zhu Xinjian He Liang Wang Xiaoxue Liao Guangping Teng Pengli Jing 

机构地区：[1]Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology),Ministry of Education,Xuzhou 221116,China [2]National Professional Laboratory for Fundamental Research of Mine Gas and Dust Control Technology,School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China [3]School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China

出　　处：《International Journal of Mining Science and Technology》2022年第1期215-224,共10页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51904291);the Basic Research Program of Jiangsu Province(No.BK20190638);the Fundamental Research Funds for the Central Universities(No.2020XGYJ08);the Project funded by China Postdoctoral Science Foundation(No.2020 M681781),the Jiangsu Planned Projects for Postdoctoral Research Funds(No.2020Z076);the State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology(No.SICGM202105).

摘　　要：High humidity and high dust concentration in deep coal mines may severely challenge the performance of respirators worn by coal miners.This paper aims at quantitatively evaluating the respirators used in deep coal mines and providing scientific guidance for the respiratory protection of miners.Based on the self-designed in-situ PM2.5 collector,controllable PM2.5 generator,human breathing simulator,and respirator simulation testing system,under the simulated deep mine working condition,this study investigated the effects of dust loading,wearing time,and dust concentration on the filtration efficiency,breathing resistance,and quality factor of N95 elastomeric respirators.With the increase of dust loading,the respirator filtration efficiency firstly decreased,then increased(minimum value 97.5%).The breathing resistance increased exponentially from 120 to 180 to 1020-1530 Pa,and the quality factor decreased logarithmically from 0.051 to 0.076 to 0.0058-0.0085 Pa^(-1).As the PM2.5 coal dust concentration increased from 5 to 50 mg/m^(3),the wearing time for the respirator breathing resistance to exceed 300 Pa reduced from 7 h to less than 1 h.One N95 elastomeric respirator is not able to perform an 8-h work shift.To avoid the excessive breathing resistance caused by dust loading,more filter cartridges are needed for coal miners.

关 键 词：Coal dust RESPIRATOR Dust loading Filtration efficiency Breathing resistance 

分 类 号：TD714.4[矿业工程—矿井通风与安全]