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Performance and emission characteristics of a high-compression-ratio diesel engine fueled with wood pyrolysis oil-butanol blended fuels

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  • Kim, Tae Young
  • Lee, Seokhwan
  • Kang, Kernyong

Abstract

WPO (Wood pyrolysis oil) has the potential to replace a considerable volume of conventional fossil fuels. However, the application of WPO in a diesel engine is constrained because of its poor properties, including a low cetane number, high water content, and high viscosity. In this study, two strategies are adopted to facilitate the use of WPO in a compression ignition engine. First, the properties of WPO are enhanced by introducing n-butanol and two cetane improvers as additives. Blending with n-butanol effectively reduces the viscosity of WPO to the proper level for use in conventional engines while suppressing WPO polymerization, which would otherwise spontaneously produce gummy polymers. The combination of WPO and n-butanol maintains the percentage of biomass-derived fuels in the final blends at 75 wt%. The auto-ignitability of the WPO-butanol blended fuel is improved by the addition of the cetane boosters, PEG 400 (polyethylene glycol 400) and 2-EHN (2-ethylhexyl nitrate). Second, the compression ratio of the engine is increased to 25 from 17.1 to secure stable combustion of the blended fuels by creating high in-cylinder temperature conditions. Experimental results show that stable combustion characteristics are obtained for WPO-blended fuels with a maximum WPO content of 30 wt%. The combustion of WPO-blended fuels produces more hydrocarbon and carbon monoxide emissions than diesel fuel combustion over most of the engine load range. However, nitrogen oxides and particulate matter emissions for the blended fuel with 30 wt% WPO (Blend D) are similar to or lower than those of diesel fuel over the entire engine load range of IMEP (indicated mean effective pressures), 0.2–0.8 MPa.

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  • Kim, Tae Young & Lee, Seokhwan & Kang, Kernyong, 2015. "Performance and emission characteristics of a high-compression-ratio diesel engine fueled with wood pyrolysis oil-butanol blended fuels," Energy, Elsevier, vol. 93(P2), pages 2241-2250.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p2:p:2241-2250
    DOI: 10.1016/j.energy.2015.10.119
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    Cited by:

    1. Lee, Seokhwan & Woo, Sang Hee & Kim, Yongrae & Choi, Young & Kang, Kernyong, 2020. "Combustion and emission characteristics of a diesel-powered generator running with N-butanol/coffee ground pyrolysis oil/diesel blended fuel," Energy, Elsevier, vol. 206(C).
    2. Goel, Varun & Kumar, Naresh & Singh, Paramvir, 2018. "Impact of modified parameters on diesel engine characteristics using biodiesel: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 2716-2729.
    3. Kim, Tae Young & Negash, Assmelash A. & Cho, Gyubaek, 2017. "Experimental study of energy utilization effectiveness of thermoelectric generator on diesel engine," Energy, Elsevier, vol. 128(C), pages 531-539.
    4. Kim, Keunsoo & Kim, Junghwan & Oh, Seungmook & Kim, Changup & Lee, Yonggyu, 2017. "Evaluation of injection and ignition schemes for the ultra-lean combustion direct-injection LPG engine to control particulate emissions," Applied Energy, Elsevier, vol. 194(C), pages 123-135.
    5. Yang, S.I. & Wu, M.S., 2017. "The droplet combustion and thermal characteristics of pinewood bio-oil from slow pyrolysis," Energy, Elsevier, vol. 141(C), pages 2377-2386.

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