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Effects of exhaust gas recirculation (EGR) on combustion and emissions during cold start of direct injection (DI) diesel engine

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  • Peng, Haiyong
  • Cui, Yi
  • Shi, Lei
  • Deng, Kangyao

Abstract

Through experiments conducted on a single cylinder direct injection (DI) diesel engine, effects of exhaust gas recirculatoin (EGR) on combustion and emission during cold start were investigated. Combustion of first firing cycle can be promoted significantly by introducing EGR. In experiments, when partially closed choking valve and partially or fully opened EGR valve, peak cylinder pressure of first firing cycle was about 45% higher than that under normal condition without EGR, and the start of combustion (SOC) was also much earlier. EGR also had effects on combustion stability. In the case, which kept 50% or 100% opening of EGR valve (OEV) and kept 100% opening of choking valve (OCV), more stable combustion process was achieved when common rail pressure decreased during cold start. However, excessive amount of EGR led to extreme unstable combustion and even misfiring. Opacity and NO emissions were also analyzed in detail. In the case with maximum EGR, the lowest average opacity, which was less than 4%, was achieved during initial several firing cycles of cold start. But in the later phase, excessive amount of EGR led to a great deal of white smoke emission. NO emission during initial phase of cold start is mainly affected by increase in fuel amount of injection. When combustion became stable gradually, EGR showed significant effect on NO reduction.

Suggested Citation

  • Peng, Haiyong & Cui, Yi & Shi, Lei & Deng, Kangyao, 2008. "Effects of exhaust gas recirculation (EGR) on combustion and emissions during cold start of direct injection (DI) diesel engine," Energy, Elsevier, vol. 33(3), pages 471-479.
    • Handle: RePEc:eee:energy:v:33:y:2008:i:3:p:471-479
    DOI: 10.1016/j.energy.2007.10.014
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    References listed on IDEAS

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    1. Shi, Lei & Cui, Yi & Deng, Kangyao & Peng, Haiyong & Chen, Yuanyuan, 2006. "Study of low emission homogeneous charge compression ignition (HCCI) engine using combined internal and external exhaust gas recirculation (EGR)," Energy, Elsevier, vol. 31(14), pages 2665-2676.
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    6. Palash, S.M. & Kalam, M.A. & Masjuki, H.H. & Masum, B.M. & Rizwanul Fattah, I.M. & Mofijur, M., 2013. "Impacts of biodiesel combustion on NOx emissions and their reduction approaches," Renewable and Sustainable Energy Reviews, Elsevier, vol. 23(C), pages 473-490.
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    9. Cui, Yi & Peng, Haiyong & Deng, Kangyao & Shi, Lei, 2014. "The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts," Energy, Elsevier, vol. 64(C), pages 323-329.
    10. Myung, Cha-Lee & Jang, Wonwook & Kwon, Sangil & Ko, Jinyoung & Jin, Dongyoung & Park, Simsoo, 2017. "Evaluation of the real-time de-NOx performance characteristics of a LNT-equipped Euro-6 diesel passenger car with various vehicle emissions certification cycles," Energy, Elsevier, vol. 132(C), pages 356-369.
    11. Tammo Zobel & Christian Schürch & Konstantinos Boulouchos & Christopher Onder, 2020. "Reduction of Cold-Start Emissions for a Micro Combined Heat and Power Plant," Energies, MDPI, vol. 13(8), pages 1-18, April.
    12. Feng, Hongqing & Zheng, Zunqing & Yao, Mingfa & Cheng, Gang & Wang, Meiying & Wang, Xin, 2013. "Effects of exhaust gas recirculation on low temperature combustion using wide distillation range diesel," Energy, Elsevier, vol. 51(C), pages 291-296.
    13. Tira, H.S. & Herreros, J.M. & Tsolakis, A. & Wyszynski, M.L., 2012. "Characteristics of LPG-diesel dual fuelled engine operated with rapeseed methyl ester and gas-to-liquid diesel fuels," Energy, Elsevier, vol. 47(1), pages 620-629.
    14. Lu, Kangbo & Qiu, Hongjian & Chen, Ziqiang & Shi, Lei & Deng, Kangyao, 2023. "Environmental adaptability method for improving the cold start performance of the diesel engine based on pilot injection strategy," Energy, Elsevier, vol. 281(C).
    15. Pastor, J.V. & Bermúdez, V. & García-Oliver, J.M. & Ramírez-Hernández, J.G., 2011. "Influence of spray-glow plug configuration on cold start combustion for high-speed direct injection diesel engines," Energy, Elsevier, vol. 36(9), pages 5486-5496.
    16. Rajasekar, E. & Murugesan, A. & Subramanian, R. & Nedunchezhian, N., 2010. "Review of NOx reduction technologies in CI engines fuelled with oxygenated biomass fuels," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(7), pages 2113-2121, September.
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    18. Ko, Jinyoung & Jin, Dongyoung & Jang, Wonwook & Myung, Cha-Lee & Kwon, Sangil & Park, Simsoo, 2017. "Comparative investigation of NOx emission characteristics from a Euro 6-compliant diesel passenger car over the NEDC and WLTC at various ambient temperatures," Applied Energy, Elsevier, vol. 187(C), pages 652-662.

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