Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, PR China.
Sci Total Environ. 2011 Jan 1;409(3):523-9. doi: 10.1016/j.scitotenv.2010.10.027. Epub 2010 Nov 16.
The effect of dimethyl carbonate (DMC) on the gaseous and particulate emissions of a diesel engine was investigated using Euro V diesel fuel blended with different proportions of DMC. Combustion analysis shows that, with the blended fuel, the ignition delay and the heat release rate in the premixed combustion phase increase, while the total combustion duration and the fuel consumed in the diffusion combustion phase decrease. Compared with diesel fuel, with an increase of DMC in the blended fuel, the brake thermal efficiency is slightly improved but the brake specific fuel consumption increases. On the emission side, CO increases significantly at low engine load but decreases at high engine load while HC decreases slightly. NO(x) reduces slightly but the reduction is not statistically significant, while NO(2) increases slightly. Particulate mass and number concentrations decrease upon using the blended fuel while the geometric mean diameter of the particles shifts towards smaller size. Overall speaking, diesel-DMC blends lead to significant improvement in particulate emissions while the impact on CO, HC and NO(x) emissions is small.
使用不同比例碳酸二甲酯（DMC）与欧 V 柴油燃料混合，研究了 DMC 对柴油机气态和颗粒排放的影响。燃烧分析表明，使用混合燃料时，预混燃烧阶段的点火延迟和放热率增加，而总燃烧持续时间和扩散燃烧阶段消耗的燃料减少。与柴油燃料相比，随着混合燃料中 DMC 的增加，制动热效率略有提高，但制动比油耗增加。在排放方面，在低发动机负荷时 CO 显著增加，但在高发动机负荷时减少，而 HC 略有减少。NO(x) 略有减少，但减少不具有统计学意义，而 NO(2) 略有增加。使用混合燃料时，颗粒物的质量和数量浓度降低，而颗粒的几何平均直径向更小尺寸转移。总体而言，柴油-DMC 混合物显著改善了颗粒物排放，而对 CO、HC 和 NO(x)排放的影响较小。
