Experimental investigation of regulated and unregulated emissions from a diesel engine fueled with ultralow-sulfur diesel fuel blended with ethanol and dodecanol.
Experimental investigation of regulated and unregulated emissions from a diesel engine fueled with ultralow-sulfur diesel fuel blended with ethanol and dodecanol.
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DOI：
10.1016/j.atmosenv.2008.09.009
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发表时间：
2008-12
影响因子：
5
通讯作者：
C. Cheung;Yage Di;Zuo-hua Huang
中科院分区：
文献类型：
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作者：
C. Cheung;Yage Di;Zuo-hua Huang
以超低硫柴油为主要燃料，乙醇为含氧添加剂，十二醇为溶剂的四缸直喷柴油机为研究对象，在发动机转速为1800revmin−1时，研究了该发动机在5种发动机负荷下的调节和不调节排放特性。混合燃料中乙醇的体积分数分别为6.1%、12.2%、18.2%和24.2%，对应混合燃料中氧气的质量分数分别为2%、4%、6%和8%。结果表明：随着燃料中乙醇含量的增加，制动比油耗增大，而制动热效率变化不大；在规范排放方面，HC和CO在发动机低负荷时显著增加，但在发动机高负荷时可能有所下降；nox在发动机低负荷时略有减少，但在发动机高负荷时略有增加；而颗粒质量在发动机高负荷时显著减少。未燃烧的乙醇和乙醛增加，而甲醛、乙烯、乙炔、1,3-丁二烯和BTX（苯、甲苯和二甲苯）普遍减少，特别是在发动机高负荷时。发现柴油氧化催化剂（DOC）可以显著减少大部分污染物，包括空气有毒物质。
Experiments were conducted on a four-cylinder direct-injection diesel engine using ultralow-sulfur diesel as the main fuel, ethanol as the oxygenate additive and dodecanol as the solvent, to investigate the regulated and unregulated emissions of the engine under five engine loads at an engine speed of 1800revmin−1. Blended fuels containing 6.1%, 12.2%, 18.2% and 24.2% by volume of ethanol, corresponding to 2%, 4%, 6% and 8% by mass of oxygen in the blended fuel, were used. The results indicate that with an increase in ethanol in the fuel, the brake specific fuel consumption becomes higher while there is little change in the brake thermal efficiency. Regarding the regulated emissions, HC and CO increase significantly at low engine load but might decrease at high engine load, NOxemission slightly decreases at low engine load but slightly increases at high engine load, while particulate mass decreases significantly at high engine load. For the unregulated gaseous emissions, unburned ethanol and acetaldehyde increase but formaldehyde, ethene, ethyne, 1,3-butadiene and BTX (benzene, toluene and xylene) in general decrease, especially at high engine load. A diesel oxidation catalyst (DOC) is found to reduce significantly most of the pollutants, including the air toxics.