Abstract Dimethyl carbonate (DMC) has high oxygen content (53.3%) and a non-toxic preparation, which is a promising additive for diesel fuel. Exhaust gas recirculation (EGR) technology inhibits the formation of NOX. The combination of DMC with EGR is considered to be a practical means of meeting emissions regulations. In this study, a four-cylinder diesel engine was used to study the effects of DMC and EGR on engine emissions and performance. The three test fuels included a pure diesel (D100), 10% DMC and 90% diesel (DMC10), and 20% DMC and 80% diesel (DMC20). The results show that the DMC20 mixtures created a longer ignition delay, and resulted in the highest pressure and heat release rate. However, the use of DMC shortened the duration of the combustion. The brake specific fuel consumption of the DMC blends was higher than that of diesel, and the brake thermal efficiency of the DMC10 was higher than diesel at the same EGR. Through an energy balance analysis, DMC20 has a significant potential for exhaust gas energy recovery. Overall, DMC20 had the best combustion performance when it was used in combination with EGR rates of 20%−30%. When EGR = 40%, the NOX emission of DMC20 was reduced by 64.9%, and the soot emission was reduced by 80%. The nucleation mode and aggregation mode particulate matter (PM) emissions were less affected by EGR, the total PM concentration of DMC20 reduced to less than 20% of D100, and the mass concentration was reduced by approximately 70%.

中文翻译：

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碳酸二甲酯 (DMC) 作为具有不同 EGR 率的压燃式发动机替代燃料的潜力

摘要 碳酸二甲酯（DMC）含氧量高（53.3%），制剂无毒，是一种很有前景的柴油添加剂。废气再循环 (EGR) 技术可抑制 NOX 的形成。DMC 与 EGR 的结合被认为是满足排放法规的实用手段。在这项研究中，使用四缸柴油发动机来研究 DMC 和 EGR 对发动机排放和性能的影响。三种测试燃料包括纯柴油 (D100)、10% DMC 和 90% 柴油 (DMC10)，以及 20% DMC 和 80% 柴油 (DMC20)。结果表明，DMC20 混合物产生了更长的点火延迟，并导致最高的压力和热释放率。然而，DMC 的使用缩短了燃烧的持续时间。DMC 混合物的制动比油耗高于柴油，在相同的EGR下，DMC10的制动热效率高于柴油。通过能量平衡分析，DMC20 具有显着的废气能量回收潜力。总体而言，当 DMC20 与 20%-30% 的 EGR 率结合使用时，其燃烧性能最佳。EGR=40%时，DMC20的NOX排放量降低64.9%，烟尘排放量降低80%。成核模式和聚集模式颗粒物（PM）排放受EGR影响较小，DMC20的PM总浓度降低至D100的20%以下，质量浓度降低约70%。DMC20与20%-30%的EGR率结合使用时，燃烧性能最好。EGR=40%时，DMC20的NOX排放量降低64.9%，烟尘排放量降低80%。成核模式和聚集模式颗粒物（PM）排放受EGR影响较小，DMC20的PM总浓度降低至D100的20%以下，质量浓度降低约70%。DMC20与20%-30%的EGR率结合使用时，燃烧性能最好。EGR=40%时，DMC20的NOX排放量降低64.9%，烟尘排放量降低80%。成核模式和聚集模式颗粒物（PM）排放受EGR影响较小，DMC20的PM总浓度降低至D100的20%以下，质量浓度降低约70%。