聚甲醛-二甲醚(PODEn)混合燃料对柴油机排放的影响:从烟尘颗粒气溶胶质谱和乙醚计测量中的见解

IF 3.8 Q2 ENVIRONMENTAL SCIENCES Atmospheric Environment: X Pub Date : 2023-04-01 DOI:10.1016/j.aeaoa.2023.100216
Mutian Ma , Laura-Hélèna Rivellini , Nethmi Kasthuriarachchi , Qiren Zhu , Yichen Zong , Wenbin Yu , Wenming Yang , Markus Kraft , Alex K.Y. Lee
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引用次数: 0

摘要

聚甲醛二甲醚(PODEn)是一种很有前途的柴油添加剂,可以有效地减少颗粒物(PM)的排放,但由于PODEn柴油混合燃料的应用,PM排放的化学和物理特性的变化在很大程度上仍未得到探索。本实验室研究调查了PODE3–柴油混合燃料(10、20和30体积%的PODE3与柴油混合,分别表示为P10、P20和P30)在30%和60%发动机负荷下对柴油发动机排放的影响。通过烟尘颗粒气溶胶质谱仪(SP-AMS)和七波长乙醚计的组合,对炭黑(BC)和有机气溶胶(OA)进行了实时表征。我们的结果表明,在两种发动机负载下,PODE3都可以显著降低OA和BC排放,其中P20产生了最大的PM总质量减少(>;84%)。耐火含氧碎片对BC质量的贡献(即C3O2+/C3+和C3O+/C3+)的变化表明PODE3可以降低烟灰表面/纳米结构的功能。这是首次表明PODE3会影响柴油机排气中BC和OA的混合状态。增加PODE3的混合体积可以降低由显著量的BC(按质量计)组成的颗粒类型的总分数贡献。此外,单颗粒数据的聚类分析可以确定两个以OA为主的颗粒类别,它们以碳氢化合物片段(CxHy+)为主,其中一个具有较高的高分子量化合物信号贡献。最后,对于两种发动机负载,使用PODE3混合体积可以提高BC(AAEBC)的吸收Ångström指数,并且棕色碳(即OA的光吸收部分)在370nm波长下可以对气溶胶的总吸收贡献高达~5%。总的来说,这项工作深入了解了PODEn混合燃料应用对柴油机燃烧排放的BC和OA的化学和光学特性的潜在影响。
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Effects of polyoxymethylene dimethyl ether (PODEn) blended fuel on diesel engine emission: Insight from soot-particle aerosol mass spectrometry and aethalometer measurements

Polyoxymethylene Dimethyl Ether (PODEn) is a promising diesel additive that can reduce particulate matter (PM) emission effectively, yet the changes in chemical and physical characteristics of PM emissions due to the application of PODEn-diesel blended fuel remain largely unexplored. This laboratory study investigates the effects of PODE3–diesel blended fuels (10, 20, and 30 vol% of PODE3 mixed with diesel, denoted as P10, P20, and P30, respectively) on diesel engine emissions at 30% and 60% engine loads. Black carbon (BC) and organic aerosol (OA) were characterized in real time by a combination of a soot-particle aerosol mass spectrometer (SP-AMS) and a seven-wavelength aethalometer. Our results show that PODE3 can significantly reduce both OA and BC emissions at both engine loads, with P20 producing the largest total PM mass reductions (>84%). The changes in the contribution of refractory oxygenated fragments to BC mass (i.e., C3O2+/C3+ and C3O+/C3+) indicate that PODE3 can reduce the functionality of soot surface/nanostructure. This is the first work showing that PODE3 can affect the mixing state of BC and OA in diesel engine exhaust. Increasing PODE3 blended volume can reduce the total fraction contribution of particle types that were composed of notably amounts of BC by mass. Furthermore, clustering analysis of single-particle data can identify two OA-dominated particle classes that were dominated by hydrocarbon fragments (CxHy+), and one of them had higher signal contribution from high molecular weight compounds. Lastly, the absorption Ångström exponent of BC (AAEBC) can be enhanced with PODE3 blended volume for both engine loads, and brown carbon (i.e., a light absorbing fraction of OA) can contribute up to ∼5% to the total aerosol absorption at the wavelength of 370 nm. Overall, this work provides insights into the potential impacts of PODEn blended fuel application on the chemical and optical properties of BC and OA emitted from diesel engine combustion.

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来源期刊
Atmospheric Environment: X
Atmospheric Environment: X Environmental Science-Environmental Science (all)
CiteScore
8.00
自引率
0.00%
发文量
47
审稿时长
12 weeks
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