Correlations between physicochemical properties of emitted diesel particulate matter and its reactivity
Correlations between physicochemical properties of emitted diesel particulate matter and its reactivity
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DOI：
10.1016/j.combustflame.2016.02.029
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发表时间：
2016-05
影响因子：
4.4
通讯作者：
W. Mühlbauer;C. Zöllner;S. Lehmann;S. Lorenz;D. Brüggemann
中科院分区：
文献类型：
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作者：
W. Mühlbauer;C. Zöllner;S. Lehmann;S. Lorenz;D. Brüggemann
大量的出版物已经强调了排放的柴油颗粒物（PM）的个体物理或化学性质的差异，并将它们与碳烟反应性相关联。本文第一部分是概述。我们的研究在第二部分中提出的包括确定的物理和化学性质的排放PM，这是在不同的增压和喷射压力的现代轻型柴油机上产生的。个别属性已被反对的PM的反应性。之后，这些相关性进行了讨论。实验显示了碳烟反应性的广泛差异（高达162 °C）。所确定的碳烟结构以及初级颗粒尺寸的差异很小，并不明显相关的碳烟反应性。因此，必须有另一种性质在很大程度上影响烟灰反应性。PM组成（氧，灰分含量）被确定为影响烟灰反应性的另一个属性。不同的灰分含量显示出良好的相关性，碳烟的氧化行为。灰分含量的差异可以用不同的采样时间来解释，因为颗粒大小和数量排放差异很大，导致排放的颗粒质量变化很大。灰分（Ca、Zn、Al）的来源是来自燃料、润滑油和发动机磨损的无机元素。此外，烟灰中的氧含量是影响烟灰反应性的另一种化学性质。
Plenty of publications have highlighted differences in individual physical or chemical properties of emitted diesel particulate matter (PM) and have correlated them to soot reactivity. An overview is given in the first part of the paper. Our study presented in the second part includes the determination of physical and of chemical properties of the emitted PM, which was generated at different boost and injection pressures on a modern light-duty diesel engine. The individual properties have been opposed to the reactivity of the PM. Afterwards, these correlations are discussed. The experiments show wide-ranging distinctions in soot reactivity (up to 162 °C). The determined differences in soot structures as well as in primary particle sizes are small and do not correlate clearly to soot reactivity. Hence, there has to be a further property which influences soot reactivity to a high extent. PM composition (oxygen, ash content) is identified as a further property impacting soot reactivity. The various ash contents show good correlations to the soot oxidation behavior. The distinctions in ash contents can be explained by the different sampling durations because of large changes in emitted particulate mass, due to the high differences in particle size and number emissions. The source of the ash (Ca, Zn, Al) is attributed to inorganic elements from fuel, lubricating oil and engine wear. In addition, the oxygen content in soot is a further chemical property impacting soot reactivity.