Performance of N95 elastomeric respirators in high humidity and high coal dust concentration environment
Performance of N95 elastomeric respirators in high humidity and high coal dust concentration environment
复制标题
N95弹性防护口罩在高湿、高煤尘浓度环境下的性能
DOI：
10.1016/j.ijmst.2021.11.007
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发表时间：
2022-01-01
影响因子：
11.8
通讯作者：
Jing, Pengli
中科院分区：
文献类型：
--
作者：
Zhu, Jintuo;He, Xinjian;Jing, Pengli
深煤高湿、高粉尘环境对煤矿工人佩戴的防护口罩性能提出了严峻的挑战。本文旨在对煤矿深部使用的呼吸器进行定量评价，为矿工的呼吸防护工作提供科学指导。基于自主设计的原位PM2.5捕集器、可控PM2.5发生器、人体呼吸模拟器和呼吸器仿真测试系统，在模拟矿山深部工况下，研究了粉尘负荷、磨损时间和粉尘浓度对N95弹性呼吸器过滤效率、呼吸阻力和品质因子的影响。随着粉尘负荷的增加，呼吸器过滤效率先降低后升高（最小值为97.5%）。呼吸阻力从120 ~ 180到1020 ~ 1530 Pa呈指数增长，质量因子从0.051 ~ 0.076到0.0058 ~ 0.0085 Pa-1呈对数递减。当PM2.5煤尘浓度从5 mg/m增加到50 mg/m(3)时，呼吸阻力超过300 Pa的呼吸器的佩戴时间从7 h减少到1 h以下。一个N95弹性呼吸器无法完成8 h的轮班工作。为了避免粉尘负荷带来的过大的呼吸阻力，煤矿工人需要更多的滤筒。(C) 2021年由Elsevier B.V.代表中国矿业大学出版。
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. (C) 2021 Published by Elsevier B.V. on behalf of China University of Mining & Technology.