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Validation of a new method for directional dust monitoring

机译：验证新的定向粉尘监测方法

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Fugitive dust from industrial sites is problematic to quantify and can be associated with nuisance complaints. Despite significant limitations, the British Standard 1747 Part 5 (BS 1747:5) directional dust gauge remains preferred for monitoring fugitive dust flux on site boundaries. An alternative directional dust gauge, DustScan, was developed at the University of Leeds, UK, and uses cylindrical adhesive 'sticky pads' to sample dust in flux. With this sampler, dust capture is measured as soiling, as opposed to mass, with the BS 1747:5 sampler. An Aerosol Test Tunnel (ATT) was developed to evaluate the performance of the DustScan sampler. Atmospheric turbulence was simulated using a coarse grid generator and maintained as rough-wall channel flow by roughness elements fixed to its floor and roof of the ATT. A poly-disperse test dust was introduced upwind to form a cloud at the sampler. DustScan directional dust gauges were repeatedly exposed to aliquots of test dust at wind speeds of 2-10 m s~(-1) in the ATT. Dust soiling levels either side of the gauge's centreline (relative to the incident direction) were compared to demonstrate that the DustScan sampler is directionally accurate. Much lower proportions of antithetic sampling (dust catch on the downwind face of the gauge) occurred than for the BS 1747:5 sampler. The sampled particle size selection was related to the ratio of particle stop distance (s) to sampler diameter (D) ratio, sjD, showing that the particle size cut point fell with increasing wind speeds. A preliminary assessment of collection efficiency (CE) was made by determining dust mass after controlled ignition of selected sticky pad samples. Although dust saturation of the sticky pads can lead to sample loss over prolonged exposure periods, this loss is relatively small over the 1-2 week intervals established as appropriate for the DustScan sampler. This need for shorter sampling intervals is considered to outweigh the convenience of the longer exposure time but significantly poorer dust sampling characteristics of the BS 1747:5 sampler.
机译：来自工业现场的逸散粉尘难以量化，并且可能与令人讨厌的投诉相关。尽管存在很大的局限性，英国标准1747第5部分（BS 1747：5）定向灰尘测量仪仍然是监视站点边界上的扬尘通量的首选。英国利兹大学开发了另一种定向灰尘计DustScan，它使用圆柱形粘合剂“粘垫”对助焊剂中的灰尘进行采样。使用此采样器，使用BS 1747：5采样器测量的尘埃捕集是相对于质量的污物测量。开发了气溶胶测试通道（ATT）来评估DustScan采样器的性能。使用粗网格发生器模拟了大气湍流，并通过固定在ATT底部和顶部的粗糙元素将其作为粗糙壁通道的流动来保持。将多分散测试粉尘引入到上风以在采样器处形成云。在ATT中，在2-10 m s〜（-1）的风速下，将DustScan定向式测尘仪反复暴露于等分试样中。比较了量规中心线两侧的灰尘污染水平（相对于入射方向），以证明DustScan采样器的方向准确。与BS 1747：5采样器相比，对比例采样（仪表的顺风面上的灰尘捕获）的比例要低得多。采样的粒度选择与颗粒停止距离（s）与采样器直径（D）的比sjD有关，这表明粒度切点随风速的增加而降低。通过在选定的粘性垫样品受控点火后确定粉尘质量，初步评估了收集效率（CE）。尽管粘尘垫的灰尘饱和会导致长时间的暴露而导致样品流失，但在为DustScan采样器确定的1-2周间隔内，这种流失相对较小。认为需要较短的采样间隔会超过较长的暴露时间带来的便利，但BS 1747：5采样器的粉尘采样特性会大大降低。

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