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研究报告

刘佳琪,张国城,吴丹,霍胜伟,荆文杰,沈上圯,赵晓宁.PM₁切割器的评价及其与PM_2.5切割器的切换研究[J].环境科学学报,2021,41(12):5093-5097

基金项目：国家质量基础的共性技术研究与应用国家重点研发计划（No.2017YFF0205504）；中国博士后科学基金面上资助项目（No.2019M660538）

摘要：开展了PM₁切割器的性能评价研究,通过搭建基于静态箱法的评价系统,选用8种粒径的单分散聚苯乙烯微球,结合空气动力学粒径谱仪获取PM₁切割器的捕集效率,最终得出拟合曲线.通过该方法测量得出某台BGI的PM₁切割器在16.67 L·min^-1工作流量下的50%切割粒径分布在(1.0±0.1) μm范围内,几何标准偏差分布在1.2±0.1范围内.同时研究了采样流量对PM₁切割器性能的影响,发现50%切割粒径随流量增大呈现减小趋势,而几何标准偏差一致性较好,偏差不超过1%,尤其当采样流量为6.77 L·min^-1时,PM₁切割器的性能可调整为符合国家标准对PM_2.5切割器的要求,本研究成果为PM₁切割器评价方法及性能指标的确定提供了参考.

Abstract：The performance evaluation of PM₁ cutter was studied. By building an evaluation system based on static box method, 8 kinds of monodisperse polystyrene microspheres with different particle sizes were selected. Combined with aerodynamic particle size spectrometer, the collecting efficiency of PM₁ cutter was obtained. The fitting curve was deserved eventually. The results show that the 50% cutting size of a BGI PM₁ cutter was in the range of (1.0±0.1) μm and the geometric standard deviation was in the range of (1.2±0.1) at the working flow of 16.67 L·min^-1. The influence of sampling flow rate on PM₁ cutter performance was also studied. It was found that the 50% cutting size decreased with the increase of flow rate, while the geometric standard deviation was consistent and the deviation was less than 1%. The performance of PM₁ cutter can be adjusted to meet the requirements of the national standard for PM_2.5 cutter when the sampling flow was 6.77 L·min^-1. The results of this study provided a reference for the evaluation method and performance indexes of PM₁ cutter.

Key words：PM₁ cutter performance evaluation 50% cutting size geometric standard deviation