目前,在汽车上使用较为普遍的清洁代用燃料有:天然气、液化石油气、醇类和醚类等。它们之所以被称为清洁代用燃料,是因为它们的相对分子质量比汽油、柴油小得多。对燃料和空气的混合、燃烧、抑制炭烟都有利,采用这类气体或液体燃料代替汽油、柴油作为汽车用燃料,其尾气排放CO、HC、CO_2等污染物比汽油、柴油低得多。此外,醇类燃料含氧,还可促进燃料燃烧更完全,燃烧温度降低,使NOx排放量减少。 At present, the more common clean alternative fuels used in automobiles are: natural gas, liquefied petroleum gas, alcohols and ethers. They are called clean alternative fuels because they have a much lower molecular weight than gasoline and diesel. The fuel and air mixture, combustion, inhibition of soot are beneficial to the use of such gas or liquid fuel instead of gasoline, diesel fuel for automobiles, the exhaust emissions of CO, HC, CO 2 and other pollutants than gasoline, diesel oil is much lower. In addition, alcohol fuel oxygen, but also to promote more complete combustion of fuel, combustion temperature decreases, so that NOx emissions reduced.