Influence of Combustion Characteristics and Fuel Composition on Exhaust PAHs in a Compression Ignition Engine
Influence of Combustion Characteristics and Fuel Composition on Exhaust PAHs in a Compression Ignition Engine
复制标题
DOI：
10.3390/en12132575
复制
发表时间：
2019-07
期刊：
影响因子：
3.2
通讯作者：
H. A. Dandajeh;M. Talibi;N. Ladommatos;P. Hellier
中科院分区：
文献类型：
--
作者：
H. A. Dandajeh;M. Talibi;N. Ladommatos;P. Hellier
本文报道了柴油机在恒喷油和恒喷油点火两种工况下，燃油组成对有毒多环芳烃（PAHs）排放的影响。以商用轻型汽车发动机为研究对象，在单缸柴油研究发动机上，对化石柴油和正庚烷、甲苯、癸酸甲酯混合燃料燃烧产生的美国EPA（United States Environmental Protection Agency）16种优先考虑的多环芳烃（PAHs）进行了定量分析。结果发现，由各种燃料混合物排放的总多环芳烃的水平随燃料点火延迟和预混燃烧分数的增加而降低，然而，在燃料混合物的点火延迟降低的情况下，使用点火改善添加剂，颗粒相多环芳烃的水平也降低。增加甲苯的水平存在于燃料混合物中降低了两个至四个环PAH的低毒性水平，而取代正庚烷与癸酸甲酯增加颗粒相吸附的PAH。总体而言，被调查的燃料的组合物被发现有更多的影响排气多环芳烃的浓度形成比燃烧特性，包括点火延迟，峰值热释放速率和预混燃烧分数的程度。
This paper reports an experimental investigation into the effects of fuel composition on the exhaust emission of toxic polycyclic aromatic hydrocarbons (PAHs) from a diesel engine, operated at both constant fuel injection and constant fuel ignition modes. The paper quantifies the US EPA (United State Environmental Protection Agency) 16 priority PAHs produced from combustion of fossil diesel fuel and several model fuel blends of n-heptane, toluene and methyl decanoate in a single-cylinder diesel research engine based on a commercial light duty automotive engine. It was found that the level of total PAHs emitted by the various fuel blends decreased with increasing fuel ignition delay and premixed burn fraction, however, where the ignition delay of a fuel blend was decreased with use of an ignition improving additive the level of particulate phase PAH also decreased. Increasing the level of toluene present in the fuel blends decreased levels of low toxicity of two to four ring PAH, while displacing n-heptane with methyl decanoate increased particulate phase adsorbed PAH. Overall, the composition of the fuels investigated was found to have more influence on the concentration of exhaust PAHs formed than that of combustion characteristics, including ignition delay, peak heat release rate and the extent of the premixed burn fractions.