Effects of oxygenated blending compounds on emissions from a turbocharged direct injection diesel engine
Effects of oxygenated blending compounds on emissions from a turbocharged direct injection diesel engine
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DOI：
10.1243/1468087001545263
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发表时间：
2000-02
影响因子：
2.5
通讯作者：
T. Litzinger;M. Stoner;H. Hess;A. Boehman
中科院分区：
文献类型：
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作者：
T. Litzinger;M. Stoner;H. Hess;A. Boehman
摘要以大众汽车（Volkswagen） 1.9升涡轮增压直喷柴油机为试验对象，研究了三种含氧化合物（二甘醇、马来酸二乙酯和马来酸二丁酯）对柴油机排放的影响。采样使用微型稀释隧道技术获得颗粒物质，并使用傅里叶变换红外（FTIR）光谱仪进行气体排放。采用热分析法和索氏萃取法对颗粒样品进行分析，分别测定挥发性有机物和可溶性有机物的含量。研究发现，这三种含氧化合物都能有效减少颗粒物排放，其中，马来酸盐化合物总体上比二甘酸盐更有效。烟尘和可溶性有机组分（SOF）变化对颗粒物减少的相对贡献分析表明，对于马来酸二乙酯和二莱肟，烟尘的减少是主导作用。虽然马来酸二乙酯在减少颗粒物方面最有效，但在大多数测试条件下，NOx排放量略有增加，但没有观察到NOx排放的一致趋势。讨论了添加剂在燃烧化学方面的差异，作为马来酸化合物在减少烟尘方面更有效的可能解释，以及马来酸二乙酯和马来酸二丁酯在有效性方面的差异。
Abstract An experimental investigation was conducted to evaluate the effect of three different oxygenated compounds, diglyme, diethyl maleate and dibutyl maleate, on emissions from a Volkswagen 1.9 litre, turbocharged, direct injection diesel engine. Sampling was performed using a mini-dilution tunnel technique to obtain particulate matter and a Fourier transform infrared (FTIR) spectrometer for gaseous emissions. The particulate samples were analysed using thermal analysis and Soxhlet extraction to determine the fraction of volatile and soluble organic material respectively. All three oxygenated compounds were found to be effective at reducing particulate emissions, with the maleate compounds being more effective overall than the diglyme. Analysis of the relative contributions of changes in the soot and soluble organic fraction (SOF) to the reduction of particulate matter indicated that, for diethyl maleate and diglyme, reductions in soot were the dominant effect. No consistent trends in NOx emissions were observed, although the diethyl maleate, which was most effective at reducing the particulate matter, increased the NOx slightly at most of the test conditions. Differences in the combustion chemistry of the additives are discussed as a possible explanation of the greater effectiveness of the maleate compounds in reducing soot, as well as for the difference in the effectiveness of diethyl and dibutyl maleate.