碳酸二甲酯与柴油混合燃料的互溶性及最佳混合比研究

Investigated on the Solubility of DMC in Diesel Fuel and the Optimum DMC Fraction in Diesel Fuel

碳酸二甲酯（DMC）具有含氧量高、沸点低等特点，适合作为柴油机的燃料添加剂。对DMC和柴油的互溶性以及不同DMC添加比例下，对柴油机的动力性、经济性、排放特性进行了研究。实验结果表明：在发动机燃油和燃烧系统不作变动的条件下，在添加比20％范围内随着DMC在柴油中添加比例的增加，排气烟度逐步下降，热效率提高；当添加比例在10％～20％时，烟度降低40％～50％，热效率增加了1％～3％，发动机功率降低4％～8％，NO。HC、CO和C02的排放变化很小。通过研究得出：DMC和柴油的最佳比例为15％；柴油和DMC的添加比在0％～15％范围内二者有很好的互溶性；上述研究对柴油机合理应用含氧燃料有指导意义。

Dimethyl carbonate（DMC） is one of the best additives for diesel engines due to its features such as highly oxygen content, lower boiling point. The compatibility of the DMC in the diesel fuel and engine power, fuel consumption and emission characteristics for different DMC fraction in blend fuel was investigated. Experimental results show that when the proportion of DMC in the blend is 0 % 20 % that smoke emission decreases, thermal efficiency increases with increasing in DMC proportion in diesel fuel without modifications on fuel injection and combustion system of the engine; when the pro- portion of DMC in the blend fuel is 10%-20%, smoke emission is reduced by 40%-50%, thermal efficiency increases by 1%-3 %, engine power output is reduced by 4 %-8 %, and the emission vari- ation of NOx, HC, CO, CO2 is very small. The investigative results show that the optimum DMC fraction in diesel fuel is 15 % ; with 0 %-15 % DMC fraction in blend fuel, the blend fuel is stable for a long time; the above results have direct significance on rational applied oxygenate blend fuel of diesel engine.