Jafarihaghighi Farid, Ardjmand Mehdi, Salar Hassani Mohammad, Mirzajanzadeh Mehrdad, Bahrami Hasanali
Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran 1584743311, Iran.
Department of Mechatronics, Arak University, Arak 3848177584, Iran.
ACS Omega. 2020 Jun 25;5(26):16053-16063. doi: 10.1021/acsomega.0c01526. eCollection 2020 Jul 7.
The present study is an attempt to examine the effect of biodiesel chemical structure on the diesel engine combustion properties and exhaust emissions. For this purpose, nine new types of oil (second generation) are used for producing biodiesel. Also, fatty acid profiles are determined by gas chromatography. Results show that Urtica biodiesel causes the highest soot emission (0.98 vol %) and the minimum NOx emission (460 ppm). A decrease in CN increases NOx and decreases soot emission at high engine loads. The longest chain is gained via Urtica biodiesel, and the increase of carbon chain length enhances soot emission. The increase of oxygen-to-carbon (O/C) ratio also affects the soot emissions and reduces the process (the O/C ratio is 0.1087 for Urtica). The increase of long-chain biodiesel fatty acids from C18 to C24 reduces the NOx emissions (C18-C24; 97.43 wt % for Urtica); moreover, there is a direct correlation between the increased carbon chain length and the amount of enthalpy. As the amount of unsaturated acids grows (94.93 wt % unsaturated fatty acids for Urtica), the value of the output soot is enhanced. Also, the increase in hydrogen-to-carbon ratio (1.8457 molar for Urtica) decreases the soot emissions. The increase in carbon chain length and decrease in O/C affect the HC and CO emissions; therefore, Urtica biodiesel had the maximum CO and HC emission (0.036 vol % and 6.11 ppm, respectively). In addition, the reduction of fuel consumption increased the NOx emission and reduced the HC, CO, and soot emission.
本研究旨在考察生物柴油化学结构对柴油机燃烧特性和尾气排放的影响。为此，使用九种新型油（第二代）来生产生物柴油。此外，通过气相色谱法测定脂肪酸谱。结果表明，荨麻生物柴油产生的碳烟排放量最高（0.98体积%），氮氧化物排放量最低（460 ppm）。十六烷值降低会使氮氧化物增加，在高发动机负荷下碳烟排放减少。荨麻生物柴油的碳链最长，碳链长度增加会提高碳烟排放。氧碳比（O/C）的增加也会影响碳烟排放并减少该过程（荨麻的O/C比为0.1087）。长链生物柴油脂肪酸从C18增加到C24会降低氮氧化物排放（荨麻的C18 - C24；97.43重量%）；此外，碳链长度增加与焓值之间存在直接关联。随着不饱和酸含量的增加（荨麻的不饱和脂肪酸含量为94.93重量%），碳烟排放值会提高。此外，氢碳比的增加（荨麻为1.8457摩尔）会降低碳烟排放。碳链长度增加和O/C降低会影响碳氢化合物和一氧化碳排放；因此，荨麻生物柴油的一氧化碳和碳氢化合物排放量最高（分别为0.036体积%和6.11 ppm）。此外，燃料消耗的减少会增加氮氧化物排放，降低碳氢化合物、一氧化碳和碳烟排放。
