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Combustion improvement and emission reduction through control of ethanol ratio and intake air temperature in reactivity controlled compression ignition combustion engine

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  • Jo, Seongin
  • Park, Suhan
  • Kim, Hyung Jun
  • Lee, Jong-Tae

Abstract

The reactivity controlled compression ignition (RCCI) combustion has the potential to simultaneously reduce the NOX and PM emissions and maintain combustion performance even when injection timing is advanced. Because intake air temperature is an important factor affecting the reactivity of fuels, it is necessary to study optimized fuel supply ratios according to the intake air temperature. Therefore, the purpose of this study was to analyze combustion and exhaust characteristics in relation to the fuel supply ratio, injection timing, and intake air temperature. In this study, ethanol was injected into an intake port; increasing the ethanol supplied ratio increased the ignition delay. Thus, the net indicated mean effective pressure (IMEPnet), compared with conventional diesel combustion, increased from 4.14 to 4.90 bar for the advanced injection timing (BTDC 27°). In addition, because the combustion period was lengthened and combustion temperature lowered, the NOX emission decreased (19.1 → 2.7 g/kWh); however, the THC (1.1 → 2.5 g/kWh) and CO (5.2 → 10.1 g/kWh) emissions increased. Moreover, burning an homogeneous mixture of ethanol decreased the particulate matter emission from 74 to 45 μg/m3. However, under high intake air temperature conditions, the effect of ethanol ratio on ignition delay was small. Therefore, the injection timing at which the maximum IMEPnet occurred was retarded. In addition, as the intake air temperature increased, the THC and CO emissions decreased and that of NOX increased.

Suggested Citation

  • Jo, Seongin & Park, Suhan & Kim, Hyung Jun & Lee, Jong-Tae, 2019. "Combustion improvement and emission reduction through control of ethanol ratio and intake air temperature in reactivity controlled compression ignition combustion engine," Applied Energy, Elsevier, vol. 250(C), pages 1418-1431.
    • Handle: RePEc:eee:appene:v:250:y:2019:i:c:p:1418-1431
    DOI: 10.1016/j.apenergy.2019.05.012
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    References listed on IDEAS

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    3. Han, Weiqiang & Lu, Yao & Jin, Chao & Tian, Xiaocong & Peng, Yiqiang & Pan, Suozhu & Liu, Haifeng & Zhang, Peng & Zhong, Yingzi, 2020. "Study on influencing factors of particle emissions from a RCCI engine with variation of premixing ratio and total cycle energy," Energy, Elsevier, vol. 202(C).
    4. Pan, Suozhu & Cai, Kai & Cai, Min & Du, Chenbo & Li, Xin & Han, Weiqiang & Wang, Xin & Liu, Daming & Wei, Jiangjun & Fang, Jia & Bao, Xiuchao, 2021. "Experimental study on the cyclic variations of ethanol/diesel reactivity controlled compression ignition (RCCI) combustion in a heavy-duty diesel engine," Energy, Elsevier, vol. 237(C).
    5. Zhao, Wenbin & Li, Zilong & Huang, Guan & Zhang, Yaoyuan & Qian, Yong & Lu, Xingcai, 2020. "Experimental investigation of direct injection dual fuel of n-butanol and biodiesel on Intelligent Charge Compression Ignition (ICCI) Combustion mode," Applied Energy, Elsevier, vol. 266(C).
    6. Fırat, Müjdat & Altun, Şehmus & Okcu, Mutlu & Varol, Yasin, 2022. "Comparison of ethanol/diesel fuel dual direct injection (DI2) strategy with reactivity controlled compression ignition (RCCI) in a diesel research engine," Energy, Elsevier, vol. 255(C).

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