2种铀矿井下常用口罩对气溶胶粒子的过滤特性研究

发布时间：2018-07-28 07:55

【摘要】：为探究铀矿井下常用的2种口罩对气溶胶粒子的过滤特性,在我国南方某铀矿山,利用APS 3321型空气动力学粒径谱仪对井下工作人员常用纱布口罩和KN95型口罩的过滤特性进行了研究。井下气溶胶监测数据显示,该铀矿井下典型作业场所PM10的质量浓度介于0.069~9.800 mg/m3,个数浓度介于173.918~2 561.600个/cm3;PM2.5的质量浓度介于0.039~0.479 mg/m3之间,个数浓度介于173.100~2 556.382个/cm3之间。口罩过滤特性试验结果表明:1)KN95型口罩和纱布口罩对PM10的平均过滤效率分别为95%和76%,对PM2.5的平均过滤效率分别为93%和61%,可见KN95型口罩过滤效率明显高于纱布口罩;2)在0.5~3.5μm粒径范围内,2种口罩对颗粒物的过滤效率均随粒径增大而增大,在3.5~10μm粒径范围内,2种口罩对不同粒径颗粒物的过滤效率均接近100%;3)无论从质量浓度还是个数浓度来看,经口罩过滤后的气溶胶粒子大多数分布在2.5μm粒径范围内,表明PM2.5是主要的气溶胶污染物。
[Abstract]:In order to investigate the filtration characteristics of aerosol particles by two kinds of masks commonly used in underground uranium mine, a uranium mine mountain in southern China is studied. The filtration characteristics of gauze masks and KN95 masks for underground workers were studied by using APS 3321 aerodynamics particle size spectrometer. The underground aerosol monitoring data show that the mass concentration of PM10 is 0.069 ~ 9.800 mg / m ~ (3), the mass concentration of PM2.5 is between 0.039 ~ 0.479 mg/m3 and the number concentration is between 173.100 ~ 255.382 / cm ~ 3 ~ 2 / cm ~ 3, the mass concentration of PM2.5 is between 0.039 ~ 0.479 mg/m3, and the number concentration is between 173.918 ~ (2 561.600) / cm ~ (3). The average filtering efficiency of KN95 type mask and gauze mask for PM10 was 95% and 76%, respectively, and for PM2.5 was 93% and 61%, respectively. The filtering efficiency of KN95 type mask was obviously higher than that of gauze mask. In the range of 0.5 渭 m and 3.5 渭 m, the filtration efficiency of two kinds of masks for particulate matter increased with the increase of particle size. In the range of 3.5 渭 m ~ 10 渭 m, the filtration efficiency of two kinds of masks for different particle size is close to 100 ~ (3) in terms of mass concentration and number concentration, most of the aerosol particles filtered by the mask are in the range of 2.5 渭 m particle size. PM2.5 is the main aerosol pollutant.
【作者单位】：南华大学环境保护与安全工程学院;
【基金】：国家自然科学青年基金项目(11105069) 国家级大学生创新创业训练计划项目(201210555012) 湖南省大学生研究性学习和创新性实验计划项目(序号212)
【分类号】：TD783

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