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Impact of chemical structure of individual fatty acid esters on combustion and emission characteristics of diesel engine

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  • Zhu, Lei
  • Cheung, C.S.
  • Huang, Zhen

Abstract

The effects of fatty acid chain length, number of double bonds and alcohol moiety chain length on combustion and emission characteristics were investigated. With the increase of carbon chain length of methyl ester, HC (hydrocarbon), CO and smoke emissions increase. The particle number concentration of nucleation mode decrease and accumulation mode increases with carbon chain length. The diameter of primary particle increases with carbon chain length. The double bonds of methyl ester are strongly correlated with CO, HC, nucleation mode and accumulation mode particles. The BSFC of unsaturated methyl ester is slightly higher. With increase of alcohol moiety chain length, the start of combustion is advanced, leading to lower premixed combustion, and thus resulting in the higher HC, CO and smoke and lower NOx emissions. Ethyl ester generates lower number concentration in nucleation mode, while it has higher number concentration in accumulation mode. The primary particle size of ethyl ester is larger than that of methyl ester. These results indicate that molecular structure of ester has great influence in combustion and emission characteristics. The composition of biodiesel could be modified and optimized during production process through new techniques or various feedstocks in order to improve combustion and emission of biodiesel.

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  • Zhu, Lei & Cheung, C.S. & Huang, Zhen, 2016. "Impact of chemical structure of individual fatty acid esters on combustion and emission characteristics of diesel engine," Energy, Elsevier, vol. 107(C), pages 305-320.
    • Handle: RePEc:eee:energy:v:107:y:2016:i:c:p:305-320
    DOI: 10.1016/j.energy.2016.04.030
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    References listed on IDEAS

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    1. Lapuerta, Magín & Rodríguez-Fernández, José & García-Contreras, Reyes, 2015. "Effect of a glycerol-derived advanced biofuel –FAGE (fatty acid formal glycerol ester)– on the emissions of a diesel engine tested under the New European Driving Cycle," Energy, Elsevier, vol. 93(P1), pages 568-579.
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    1. Zhao, Feiyang & Yang, Wenming & Yu, Wenbin & Li, Han & Sim, Yu Yun & Liu, Teng & Tay, Kun Lin, 2018. "Numerical study of soot particles from low temperature combustion of engine fueled with diesel fuel and unsaturation biodiesel fuels," Applied Energy, Elsevier, vol. 211(C), pages 187-193.
    2. Žvar Baškovič, Urban & Vihar, Rok & Seljak, Tine & Katrašnik, Tomaž, 2017. "Feasibility analysis of 100% tire pyrolysis oil in a common rail Diesel engine," Energy, Elsevier, vol. 137(C), pages 980-990.
    3. Chen, Hao & Su, Xin & He, Jingjing & Xie, Bin, 2019. "Investigation on combustion and emission characteristics of a common rail diesel engine fueled with diesel/n-pentanol/methanol blends," Energy, Elsevier, vol. 167(C), pages 297-311.
    4. Vikas Sharma & Abul K. Hossain & Ganesh Duraisamy, 2021. "Experimental Investigation of Neat Biodiesels’ Saturation Level on Combustion and Emission Characteristics in a CI Engine," Energies, MDPI, vol. 14(16), pages 1-18, August.

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