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在满足国V排放标准的柴油机上进行燃用国V柴油混合不同比例餐饮废油制生物柴油的试验,探究柴油机的常规排放变化与生物柴油理化特性的相关性。试验结果表明,掺混生物柴油之后,生物柴油的高含氧量使柴油机NOx排放量有所升高,但整体升幅不大,不同混合比例生物柴油的NOx排放量均与高温燃域高度相关,并可拟合为R2大于0.97的对数函数曲线;THC和CO排放量下降,与生物柴油高含氧量相关,对于不同混合比例的生物柴油,THC和CO排放都与燃烧持续期高度相关,均可以与之拟合为R2大于0.96的幂函数曲线;总颗粒数和核态颗粒数升高,聚集态颗粒数下降,核态颗粒数上升,与生物柴油粘度、硫含量高相关,聚集态颗粒数下降与生物柴油的高含氧量相关。
In the national V emission standards to meet the diesel engine Diesel V diesel fuel mixed with different proportions of waste cooking oil biodiesel test to explore the relationship between conventional diesel emission changes and the physical and chemical properties of biodiesel. The results showed that after blending biodiesel, the high oxygen content of biodiesel diesel engine NOx emissions have increased, but the overall increase was not, the different proportion of mixed biodiesel NOx emissions are associated with the high temperature combustion zone height, And can be fitted to a logarithmic curve with R2 greater than 0.97. THC and CO emissions are reduced, which are related to the high oxygen content of biodiesel. The THC and CO emissions are highly correlated with the duration of combustion for biodiesel with different mixing ratios, Can be fitted with a power function curve with R2 larger than 0.96. The total particle number and the number of nuclear particles increase, the number of aggregated particles decreases and the number of nuclear particles increases, which is related to the high viscosity and sulfur content of biodiesel. The aggregation state The decrease in particle number is related to the high oxygen content of biodiesel.