Yao Yung-Chen, Tsai Jiun-Horng, Chiang Hung-Lung
Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan, ROC.
Sci Total Environ. 2009 Sep 15;407(19):5257-62. doi: 10.1016/j.scitotenv.2009.06.017. Epub 2009 Jul 12.
The effect of ethanol-gasoline blends on criteria air pollutant emissions was investigated in a four-stroke motorcycle. The ethanol was blended with unleaded gasoline in four percentages (3, 10, 15, and 20% v/v) and controlled at a constant research octane number, RON (95), to accurately represent commercial gasoline. CO, THC, and NOx emissions were evaluated using the Economic Commission for Europe cycle on the chassis dynamometers. The results of the ethanol-gasoline blends were compared to those of commercial unleaded gasoline with methyl tert-butyl ether as the oxygenated additive. In general, the exhaust CO and NOx emissions decreased with increasing oxygen content in fuels. In contrast, ethanol added in the gasoline did not reduce the THC emissions for a constant RON gasoline. The 15% ethanol blend had the highest emission reductions relative to the reference fuel. The high ethanol-gasoline blend ratio (20%) resulted in a less emission reduction than those of low ratio blends (<15%). This may be attributed to the changes in the combustion conditions in the carburetor engine with 20% ethanol addition. Furthermore, the influence of ethanol-gasoline blends on the reduction of exhaust emissions was observed at different driving modes, especially at 15km/h cruising speed for CO and THC and acceleration stages for NOx.
在一辆四冲程摩托车上研究了乙醇 - 汽油混合燃料对标准空气污染物排放的影响。乙醇与无铅汽油按四种比例（3%、10%、15%和20%体积比）混合，并控制研究法辛烷值（RON）恒定为95，以准确代表商用汽油。使用欧洲经济委员会底盘测功机循环测试法对一氧化碳（CO）、总碳氢化合物（THC）和氮氧化物（NOx）排放进行了评估。将乙醇 - 汽油混合燃料的测试结果与添加甲基叔丁基醚作为含氧添加剂的商用无铅汽油的测试结果进行了比较。总体而言，随着燃料中含氧量增加，尾气中CO和NOx排放减少。相比之下，对于RON恒定的汽油，添加乙醇并没有降低THC排放。相对于参考燃料，15%乙醇混合燃料的排放减少量最高。高比例乙醇 - 汽油混合燃料（20%）的排放减少量低于低比例混合燃料（<15%）。这可能归因于添加20%乙醇后化油器发动机燃烧条件的变化。此外，在不同驾驶模式下观察到了乙醇 - 汽油混合燃料对尾气排放减少的影响，特别是在15公里/小时巡航速度下对CO和THC的影响，以及在加速阶段对NOx的影响。
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