Air pollution is a major issue affecting the health of millions of citizens, notably in cities where pollutants are concentrated. Low-temperature combustion is a promising route to reduce nitrogen oxides and smoke emissions from compression ignition engines. Reduction in emissions during low-temperature combustion is known, yet emissions using oxygenated biofuels are poorly known. Therefore, I tested the potential reduction in emissions using oxygenated biofuels during low-temperature combustion, in the reactivity-controlled compression ignition mode. Ethanol, a low-reactivity fuel, was inducted in the intake manifold at 10% and 20% levels on energy basis, whereas waste cooking oil biodiesel, a high-reactivity fuel, was injected directly inside the cylinder. Results show a reduction in emission of nitrogen oxides up to 60%, and of smoke up to 29%. Nonetheless, unburned hydrocarbons and carbon monoxide emissions increased up to 2% at full load for biodiesel with 20% ethanol induction, compared to neat diesel and biodiesel.

中文翻译：

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减少乙醇和废食用油的低温燃烧过程中的烟尘和氮氧化物排放

空气污染是影响数百万公民健康的主要问题，特别是在污染物集中的城市。低温燃烧是减少压燃式发动机氮氧化物和烟气排放的有前途的途径。减少低温燃烧期间的排放是已知的，但是使用含氧生物燃料的排放却知之甚少。因此，我在反应控制的压缩点火模式下，测试了在低温燃烧过程中使用含氧生物燃料减少排放的可能性。乙醇（一种低反应性燃料）以10％和20％的能量水平引入进气歧管，而废弃的食用油生物柴油（一种高反应性燃料）则直接注入气缸内。结果表明，氮氧化物的排放减少了60％，烟气的排放减少了29％。