| 不同燃料柴油机多环芳烃排放特征的试验研究 |
| 摘要点击 5018 全文点击 3416 投稿时间：2010-08-10 修订日期：2010-09-27 |
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| 中文关键词 生物柴油 多环芳烃 柴油机 排放 气质联用 |
| 英文关键词 biodiesel PAHs diesel engine emission GC/MS |
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| 中文摘要 |
| 在一台直喷式柴油机上，采用玻璃纤维滤纸及XAD-2吸附管采集、超声和索氏提取、气质联用分析等技术，测量了燃用柴油、生物柴油及其调合油B50排气中的多环芳烃类污染物(PAHs).研究表明，柴油机颗粒相PAHs排放随着负荷的增大呈现降低的趋势，气相PAHs排放随着负荷呈现先降低后升高的趋势.与柴油相比，生物柴油的颗粒相和气相PAHs排放有所降低，其平均排放浓度也均低于柴油.生物柴油排气中总PAHs排放浓度为41.1～70.1 μg/m3，总PAHs的平均排放浓度与柴油相比下降了33.3%.3种不同燃料的三环PAHs排放均占总PAHs排放量的44%左右，生物柴油的三环PAHs所占比例要高于柴油.生物柴油排放的PAHs毒性当量与柴油相比有较大程度的降低，表明燃用生物柴油对人体的危害性有所降低. |
| 英文摘要 |
| The polycyclic aromatic hydrocarbons(PAHs) were measured by glass fiber filter and XAD-2 collector, ultrasonic extraction, soxhlet extraction and GC-MS analysis equipment. The exhaust emission of the DI single cylinder diesel engine fueled with pure diesel, biodiesel and biodiesel blends of 50%(B50) were measured. The results indicate that the particle-phase PAHs emissions of diesel engine decrease with the increasing of load. The gas-phase PAHs emissions of diesel engine decrease with the increasing of load in the beginning and it turns to going up with further increasing of load. The particle-phase and gas-phase PAHs emissions of biodiesel decrease and mean concentration are lower than that of diesel. The total PAHs emission concentration of biodisesl is 41.1-70.1μg/m3. Total PAHs mean concentration emissions of biodiesel is decreased 33.3% than that of diesel. The mass proportion of three-ring PAHs emissions of those 3 kinds tested fuels is about 44% in the total PAHs. Biodiesel can increase the proportion of three-ring PAHs. Toxic equivalence of PAHs emissions of biodiesel are greatly lower than that of diesel. It is less harmful to human than diesel fuel. |
