【摘要】 对于某轻型汽油车燃用低比例甲醇的非常规排放进行了台架测试。该车带有常规三效催化剂,满足国Ⅲ排放法规。使用纯汽油、甲醇体积分数分别占10%、20%、30%的甲醇汽油作为燃料,采用Fourier变换红外光谱仪测量非常规排放。结果表明:在25℃和-7℃冷起动条件下,甲醇掺混比在10%～30%时的常规排放(CO、HC和NOx等)与使用纯汽油情况相差无几;随着甲醇掺混比的增大,非常规排放未燃甲醇和甲醛排放浓度明显增加,但是一旦催化剂起燃后,甲醇、甲醛等的转化效率很高,尾管排放接近于零。更多还原

【Abstract】 The unregulated emissions were measured on a chassis dynamometer for a light-duty vehicle fuelled with pure gasoline,fuels with the volume proportions of methanol are 10%,20% and 30% in the methanol-gasoline blends,before and after conventional three-way catalyst(TWC) using a FTIR spectrometer.The measured results show that the regulated emissions such as CO,HC and NOx of low-proportion(≤30%) methanol-gasoline blends,are the same level as those of pure gasoline under both 25 ℃ and-7℃ cold start.The unregulated emissions,such as unburned methanol and formaldehyde,before the catalyst increase with the increase of methanol proportion.However,the unburned methanol and formaldehyde have very high conversion efficiency and are near zero once the catalyst is lit off.更多还原