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Injection strategy for simultaneous reduction of NOx and soot emissions using two-stage injection in DME fueled engine

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  • Park, Su Han
  • Yoon, Seung Hyun

Abstract

The ultimate purpose of this study is the reduction of exhaust emissions from a dimethyl ether (DME) fueled diesel engine without deterioration of engine performance, such as indicated mean effective pressure (IMEP) and indicated specific fuel consumption (ISFC). In this study, we applied multiple injection strategies to achieve the research goal. In a comparison between diesel and DME single injection combustion, the IMEP in both fuels was similar around the top dead center (TDC) injection condition (this is the typical injection timing). However, the nitrogen oxide (NOx) emission in DME was higher than that in diesel. The single injection combustion in DME and diesel was compared on the basis of the same energy input condition. When the injection timing was advanced in order to reduce the DME NOx emission, the IMEP in DME decreased below the diesel level. Therefore, multiple injection strategies, including pilot injection, split injection, and advanced+post injection, were applied in this study. In the experimental results, the pilot injection strategy with advanced main injection (2nd injection) resulted in the lowest NOx, HC, and CO emissions. In the case of soot emission, DME itself has soot free combustion, and emitted an ignorable amount of soot. Moreover, the pilot injection strategy showed the highest IMEP level and the lowest ISFC level in the test conditions.

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  • Park, Su Han & Yoon, Seung Hyun, 2015. "Injection strategy for simultaneous reduction of NOx and soot emissions using two-stage injection in DME fueled engine," Applied Energy, Elsevier, vol. 143(C), pages 262-270.
    • Handle: RePEc:eee:appene:v:143:y:2015:i:c:p:262-270
    DOI: 10.1016/j.apenergy.2015.01.049
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    References listed on IDEAS

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    1. Park, Su Han & Yoon, Seung Hyun & Cha, Junepyo & Lee, Chang Sik, 2014. "Mixing effects of biogas and dimethyl ether (DME) on combustion and emission characteristics of DME fueled high-speed diesel engine," Energy, Elsevier, vol. 66(C), pages 413-422.
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    1. Imperato, Matteo & Kaario, Ossi & Sarjovaara, Teemu & Larmi, Martti, 2016. "Split fuel injection and Miller cycle in a large-bore engine," Applied Energy, Elsevier, vol. 162(C), pages 289-297.
    2. Mohan, Balaji & Yang, Wenming & Yu, Wenbin & Tay, Kun Lin, 2017. "Numerical analysis of spray characteristics of dimethyl ether and diethyl ether fuel," Applied Energy, Elsevier, vol. 185(P2), pages 1403-1410.
    3. Hanzhengnan Yu & Xingyu Liang & Gequn Shu & Xu Wang & Yuesen Wang & Hongsheng Zhang, 2016. "Experimental Investigation on Wall Film Distribution of Dimethyl Ether/Diesel Blended Fuels Formed during Spray Wall Impingement," Energies, MDPI, vol. 9(11), pages 1-17, November.
    4. Kang, Yinhu & Wei, Shuang & Zhang, Pengyuan & Lu, Xiaofeng & Wang, Quanhai & Gou, Xiaolong & Huang, Xiaomei & Peng, Shini & Yang, Dong & Ji, Xuanyu, 2017. "Detailed multi-dimensional study on NOx formation and destruction mechanisms in dimethyl ether/air diffusion flame under the moderate or intense low-oxygen dilution (MILD) condition," Energy, Elsevier, vol. 119(C), pages 1195-1211.
    5. Park, Su Han & Shin, Dalho & Park, Jeonghyun, 2016. "Effect of ethanol fraction on the combustion and emission characteristics of a dimethyl ether-ethanol dual-fuel reactivity controlled compression ignition engine," Applied Energy, Elsevier, vol. 182(C), pages 243-252.
    6. Jiang, Jibing & Li, Dinggen, 2016. "Theoretical analysis and experimental confirmation of exhaust temperature control for diesel vehicle NOx emissions reduction," Applied Energy, Elsevier, vol. 174(C), pages 232-244.
    7. Yu, Hanzhengnan & Liang, Xingyu & Shu, Gequn & Wang, Yuesen & Sun, Xiuxiu & Zhang, Hongsheng, 2018. "Numerical investigation of the effect of two-stage injection strategy on combustion and emission characteristics of a diesel engine," Applied Energy, Elsevier, vol. 227(C), pages 634-642.
    8. Wu, Shaohua & Yang, Wenming & Xu, Hongpeng & Jiang, Yu, 2019. "Investigation of soot aggregate formation and oxidation in compression ignition engines with a pseudo bi-variate soot model," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    9. Asgari, Behrad & Amani, Ehsan, 2017. "A multi-objective CFD optimization of liquid fuel spray injection in dry-low-emission gas-turbine combustors," Applied Energy, Elsevier, vol. 203(C), pages 696-710.
    10. Ayhan, Vezir & Ece, Yılmaz Mert, 2020. "New application to reduce NOx emissions of diesel engines: Electronically controlled direct water injection at compression stroke," Applied Energy, Elsevier, vol. 260(C).
    11. Zhao, Jinxing, 2017. "Research and application of over-expansion cycle (Atkinson and Miller) engines – A review," Applied Energy, Elsevier, vol. 185(P1), pages 300-319.
    12. Li, Bowen & Li, Yanfei & Liu, Haoye & Liu, Fang & Wang, Zhi & Wang, Jianxin, 2017. "Combustion and emission characteristics of diesel engine fueled with biodiesel/PODE blends," Applied Energy, Elsevier, vol. 206(C), pages 425-431.
    13. Ismael, Mhadi A. & Heikal, Morgan R. & Aziz, A. Rashid A. & Syah, Firman & Zainal A., Ezrann Z. & Crua, Cyril, 2018. "The effect of fuel injection equipment on the dispersed phase of water-in-diesel emulsions," Applied Energy, Elsevier, vol. 222(C), pages 762-771.

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