柴油机燃用不同比例菜籽油生物柴油和乙醇柴油的对比试验研究

在一台S195直喷柴油机上进行燃料燃烧对比试验,试验结果表明,燃用生物柴油和乙醇柴油会使柴油机的动力性有所下降,其中菜籽油生物柴油的动力性接近纯柴油燃料的动力性,乙醇柴油的动力性相对较差。生物柴油和乙醇柴油的油耗率都比纯柴油要高,生物柴油的油耗率要高于乙醇柴油。但随负荷的增大,这种差距呈下降趋势。生物柴油和乙醇柴油在较大工况范围都可以保持比纯柴油燃料较低的CO排放量。低负荷状态下改善不明显,甚至会增大;高负荷工况下,混合燃料的CO排放比纯柴油降低较多。绝大部分工况下,生物柴油和乙醇柴油燃料的HC排放都比纯柴油高。绝大部分工况下,生物柴油和乙醇柴油的NOx排放和碳烟排放都比纯柴油低,其中生物柴油的表现优于乙醇柴油。

Contrast Experimental Study of a Diesel Engine Burning Rapeseed Oil-based Bio-diesel and Ethanol-diesel in Various Proportions

A contrast test was performed on a S195 direct spraying diesel engine.The test results show that to burn bio-diesel and ethanol-diesel will deteriorate the power performance of the diesel engine,however,the power performance of the diesel engine burning rapeseed oil-based bio-diesel is close to that of the diesel burning pure diesel and that of the diesel engine burning ethanol-diesel is relatively poor.Both oil consumption rates of the diesel engine burning bio-diesel and ethanol-diesel are higher than that burning pure diesel.The oil consumption rate of the bio-diesel is higher than that of ethanol-diesel.However,with an increase of the load,this difference will assume a descending tendency.Both bio-diesel and ethanol-diesel can maintain a relatively low amount of CO emissions in a comparatively large range when compared with pure diesel.However,at a low load,such an improvement is not evident and even gets worsened.At a high load,the CO emissions of the blended fuels will decrease much more than those of pure diesel.Under the majority of the operating conditions,the HC emissions of both bio-diesel and ethanol-diesel are higher than that of pure diesel and the NOx and carbon-contained flue gas emissions of the bio-diesel and ethanol-diesel are lower than that of pure diesel,among them,the bio-diesel behaves better than the ethanol-diesel.