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Impact of aging on the performance of impactor and sharp-cut cyclone size selectors for DPM sampling

机译：老化对DPM采样的影响和尖锐旋风尺寸选择器的影响

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摘要

Diesel particulate matter (DPM) is an occupational health hazard in underground mines. It generally occurs in the submicrometer size range and is often present in the mine atmosphere with significant concentrations of dust particles that tend to occur in the supramicrometer size range. As dust can interfere with analytical methods to measure DPM, it is often removed from a sample stream using an impactor-type size selector such as the DPM impactor (DPMI). Because the DPMI physically removes oversized particles from the stream, its performance may be gradually reduced with aging. Sharp-cut cyclones (SCCs) are an alternative size selector for DPM sampling applications, with a major advantage that, by design, they should not be susceptible to rapid aging. This paper presents the results of a field study designed to compare the performance of aged versus new/clean DPMIs and SCCs in an underground mine. DPMI aging resulted in clogging of the device and, eventually, a reduction of its effective particle cut size, but when sample flow rate was maintained, DPM sample mass collection was not affected until significant aging had occurred. Under the conditions of this study, the effects of SCC aging were observed to be minimal at the end of the study period.
机译：柴油颗粒物（DPM）是地下矿山的职业健康危害。它通常发生在潜置尺寸范围内，并且通常存在于矿山气氛中，具有显着浓度的粉尘颗粒，倾向于在超大分子尺寸范围内发生。由于灰尘可以干扰分析方法来测量DPM，通常使用诸如DPM撞击器（DPMI）的撞击器型尺寸选择器从样品流中除去。因为DPMI物理地从流中移除过大的颗粒，所以它的性能可能随着老化逐渐减小。锐利的旋风（SCC）是DPM采样应用的替代尺寸选择器，具有主要优势，通过设计，它们不应该易于衰老。本文介绍了旨在比较地下矿井中老化/清洁DPMI和SCC的性能的现场研究的结果。 DPMI老化导致装置堵塞，最终降低其有效的粒子切割尺寸，但是当保持样品流速时，DPM样品质量收集不会受到影响，直到发生显着老化。在本研究的条件下，在研究期结束时观察到SCC老化的影响是最小的。

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  • 来源
    《Mining Engineering》 |2018年第8期|共7页
  • 作者

    S. Gaillard; E. Sarver; E. Cauda;

  • 作者单位

    Department of Mining and Minerals Engineering Virginia Polytechnic Institute and State University;

    Department of Mining and Minerals Engineering Virginia Polytechnic Institute and State University;

    CDC/NI0SH Office of Mine Safety and Health Research (OMSHR);

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  • 正文语种 eng
  • 中图分类 一般性问题;
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