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Investigation into the use of a tapered element oscillating microbalance for real-time particulate measurement.

机译：研究使用锥形元素振荡微量天平进行实时颗粒测量。

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摘要

Characterizing particulate matter (PM) in diesel exhaust emissions during transient test cycles has been a challenge for researchers. Acquisition of real-time PM data was proposed by the use of a Rupprecht and Patashnick Co., Inc. Series 1105 Diesel Particulate Monitor Tapered Element Oscillating Microbalance (TEOM) mass measuring device. The objectives of testing with a TEOM diesel particulate analyzer were to validate its collection capability and evaluate its real-time characteristics on transient test cycles. Conventional PM filtration was used as the base line for evaluating the TEOM collection capability. To evaluate real-time TEOM characteristics, the real-time mass rate data were separated into positive and negative values, then integrated over the duration of the test. The integrated positive mass was divided by the integrated negative mass to create a positive-to-negative mass ratio. This ratio was indicative of real PM collected versus moisture released from the filter. TEOM sample tube temperatures at 35°C yielded the best TEOM to conventional PM filtration ratio. However, a compromise between conventional filter data and real-time data was made in selecting the temperature set point of 40°C as the most desirable sampling temperature. Sample flow rate was varied from one to four liters per minute (lpm). The 1 lpm set point provided the best TEOM to conventional filtration ratio. The flow rate of 3 lpm was chosen to be a compromise between TEOM to conventional filtration ratio and real-time results. The best TEOM to conventional filtration ratio measured was 0.97. The filter collection efficiency of a new filter was found to be a significant source of variability. When the initial test with a new filter was disregarded, the 99% confidence interval in TEOM results was ±4.3%. In comparison, the 99% confidence interval in conventional PM results was ±1.7%.
机译：在瞬态测试循环中表征柴油机废气排放中的颗粒物（PM）一直是研究人员面临的挑战。通过使用Rupprecht和Patashnick Co.，Inc.系列1105柴油机微粒监测器锥形元素振动微量天平（TEOM）质量测量装置，提出了实时PM数据的采集方法。使用TEOM柴油颗粒分析仪进行测试的目的是验证其收集能力，并在瞬态测试循环中评估其实时特性。常规的PM过滤被用作评估TEOM收集能力的基准。为了评估实时TEOM特性，实时质量速率数据分为正值和负值，然后在测试过程中进行积分。积分的正质量除以积分的负质量，得出正负质量比。该比率表示收集的实际PM与从过滤器释放的水分的比值。 TEOM样品管在35°C的温度下可获得最佳的TEOM与常规PM过滤比。但是，在选择40°C的温度设定点作为最理想的采样温度时，在常规过滤器数据和实时数据之间做出了折衷。样品流速从每分钟1升至4升（lpm）不等。 1 lpm的设定点提供了最佳TEOM与常规过滤比。选择3 lpm的流速是TEOM与常规过滤比和实时结果之间的折衷。测得的最佳TEOM与常规过滤比为0.97。发现新过滤器的过滤器收集效率是可变性的重要来源。如果不考虑使用新过滤器的初始测试，则TEOM结果的99％置信区间为±4.3％。相比之下，常规PM结果的99％置信区间为±1.7％。

著录项

  • 作者

    Gilbert, Marcus.;

  • 作者单位

    West Virginia University.;

  • 授予单位 West Virginia University.;
  • 学科 Engineering Automotive.; Engineering Environmental.
  • 学位 M.S.M.E.
  • 年度 2003
  • 页码 74 p.
  • 总页数 74
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自动化技术及设备;环境污染及其防治;
  • 关键词

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