Engine performance and emissions of a diesel engine operating on diesel-RME (rapeseed methyl ester) blends with EGR (exhaust gas recirculation)
Engine performance and emissions of a diesel engine operating on diesel-RME (rapeseed methyl ester) blends with EGR (exhaust gas recirculation)
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DOI：
10.1016/j.energy.2007.05.016
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发表时间：
2007-11
期刊：
影响因子：
9
通讯作者：
A. Tsolakis;A. Megaritis;M. Wyszyński;K. Theinnoi
中科院分区：
文献类型：
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作者：
A. Tsolakis;A. Megaritis;M. Wyszyński;K. Theinnoi
分析了生物柴油（菜籽甲酯，RME）和不同比例的柴油/RME混合燃料对柴油机NOx排放、烟度、燃油消耗率、发动机效率、缸内压力和净放热率的影响。RME作为纯燃料或与柴油混合在未改性的发动机中燃烧导致在初始不受控制的预混合燃烧阶段中的提前燃烧、减少的点火延迟和增加的热释放速率。增加的缸内压力和温度导致增加的NOx排放，而与纯柴油燃烧相比，更先进的燃烧有助于减少烟雾。RME的低热值导致燃料消耗增加，但发动机热效率没有显着影响。当在柴油机和RME的情况下使用相似百分比（体积%）的废气再循环（EGR）时，NOx排放减少到相似的值，但是在RME的情况下烟排放显著更低。在纯RME和与柴油的50/50（体积比）混合燃料的情况下，延迟喷射正时导致NOx的进一步降低，但烟度和燃料消耗量略有增加。
The effects of biodiesel (rapeseed methyl ester, RME) and different diesel/RME blends on the diesel engine NOxemissions, smoke, fuel consumption, engine efficiency, cylinder pressure and net heat release rate are analysed and presented. The combustion of RME as pure fuel or blended with diesel in an unmodified engine results in advanced combustion, reduced ignition delay and increased heat release rate in the initial uncontrolled premixed combustion phase. The increased in-cylinder pressure and temperature lead to increased NOxemissions while the more advanced combustion assists in the reduction of smoke compared to pure diesel combustion. The lower calorific value of RME results in increased fuel consumption but the engine thermal efficiency is not affected significantly. When similar percentages (% by volume) of exhaust gas recirculation (EGR) are used in the cases of diesel and RME, NOxemissions are reduced to similar values, but the smoke emissions are significantly lower in the case of RME. The retardation of the injection timing in the case of pure RME and 50/50 (by volume) blend with diesel results in further reduction of NOxat a cost of small increases of smoke and fuel consumption.