Development and Field Evaluation of a Multiple Slit Nozzle-Based High Volume PM2.5 Inertial Impactor Assembly (HVIA)
Development and Field Evaluation of a Multiple Slit Nozzle-Based High Volume PM2.5 Inertial Impactor Assembly (HVIA)
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DOI：
10.4209/aaqr.2015.01.0050
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发表时间：
2015-08-01
影响因子：
4
通讯作者：
Gupta, Tarun
中科院分区：
文献类型：
--
作者：
Kumar, Anand;Gupta, Tarun
本研究介绍了一种大容量（Q = 950 LPM）、多狭缝、基于螺旋桨的PM2.5（颗粒空气动力学直径< 2.5 μ m）惯性撞击器的开发和实验室性能，并将其性能与现有的单级低流速（Q = 15 LPM）PM2.5撞击器进行了比较。实验室实验进行了各种基于狭缝的喷嘴撞击器使用多分散白云石粉作为测试气溶胶。在进行了严格的参数评估后，选定的最佳狭缝式冲击器配置在215 LPM（中等流量）的操作流量下的截止尺寸为2.51 μ m（空气动力学直径），冲击器级的压降为0.35 kPa。将该最佳中等流量冲击器的狭缝长度外推到950 LPM的流速，以获得高容量的基于多狭缝涡轮的PM2.5惯性冲击器组件。该新型冲击器组件由黄铜和镀铬制成，然后在PM10旋风分离器下游的高容量粉尘采样器（型号AAS 217 NL，Ecotech Instruments，印度）中进行改装。高真空硅脂被用作冲击基底。现场研究进行了共同定位的新型高容量撞击器组件（HVIA）和单级低流速PM2.5撞击器，不仅比较PM2.5的质量浓度，但元素，阴离子和水溶性有机碳（WSOC）/水溶性无机碳（WSIC）的浓度，以及为了验证HVIA在本研究中开发的。
This study presents the development and lab performance of a high volume (Q = 950 LPM), multiple slit nozzle-based PM2.5 (particle aerodynamic diameter < 2.5 mu m) inertial impactor and the performance of the same was compared with an existing single stage low flow rate (Q = 15 LPM) PM2.5 impactor. Lab experiments were performed on various slit-based nozzle impactors using polydisperse dolomite powder as test aerosol. After carrying out rigorous parametric evaluation, the optimum slit nozzle-based impactor configuration selected had cutoff size of 2.51 mu m (aerodynamic diameter) at an operating flow rate of 215 LPM (medium flow) with a pressure drop of 0.35 kPa across the impactor stage. The length of the slit of this optimum medium flow impactor was extrapolated to a flow rate of 950 LPM to obtain the high volume multiple slit nozzle-based PM2.5 inertial impactor assembly. This novel impactor assembly was fabricated from brass and chrome-plated and then retrofitted in a high volume dust sampler (Model AAS 217NL, Ecotech Instruments, India) downstream of the PM10 cyclone separator. High vacuum silicone grease was used as the impaction substrate. A field study was performed with co-located novel high volume impactor assembly (HVIA) and single stage low flow rate PM2.5 impactor, to not only compare the PM2.5 mass concentrations but elemental, anion and water soluble organic carbon (WSOC)/water soluble inorganic carbon (WSIC) concentrations as well in order to validate the HVIA developed in the present study.