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Gaseous and particle emissions in low-temperature combustion diesel–HCNG dual-fuel operation with double pilot injection

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  • De Simio, Luigi
  • Iannaccone, Sabato

Abstract

Alternative fuels and energy vectors are becoming increasingly important in terms of technical, geopolitical, economic, and environmental aspects. In particular, gaseous fuels and vectors, such as fossil or synthetic natural gas (NG) blended with hydrogen, commonly help provide optimal strategies to reduce global and toxic emissions of internal combustion engines, owing to their adaptability, anti-knock capacity, lower toxicity of pollutants, reduced CO2 emissions, and cost-effectiveness. However, diesel engines still represent the reference category among internal combustion engines in terms of maximum thermodynamic efficiency. The possibility offered by dual-fuel (DF) systems to combine the efficiency and performance of diesel engines with the environmental advantages of gaseous fuels has been the subject of extensive investigations. However, the simple replacement of diesel fuel with gaseous fuel does not allow for optimising the engine performance, owing to the high percentage of unburned gaseous fuel, which compromises the potential reduction of CO2; therefore, more complex combustion strategies should be realised. In this study, with the aim of improving the DF combustion process, an experimental investigation was performed to analyse low-temperature combustion (LTC), using NG and two enriched hydrogen-compressed NG blends as primary fuels. The LTC mode was activated by means of a very early advanced pilot injection and carried out in two close steps. The double pilot injection was used to control the energy release rate in the first combustion stage, thereby minimizing the increase of the rate of pressure and allowing the extension of the operation range under LTC. The experimental activity was also focused on analysing the particle emissions, as it is well known that these emissions, together with those of nitrogen oxide, constitute the main pollutants resulting from diesel fuel combustion. The results demonstrated the potential to reduce the unburned fuel, NOx, and particle emissions simultaneously, while maintaining equivalent CO2 emissions to a diesel-only engine. Both the timing and pressure of the pilot injection proved to be critical parameters for optimising the emissions and performance.

Suggested Citation

  • De Simio, Luigi & Iannaccone, Sabato, 2019. "Gaseous and particle emissions in low-temperature combustion diesel–HCNG dual-fuel operation with double pilot injection," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
  • Handle: RePEc:eee:appene:v:253:y:2019:i:c:54
    DOI: 10.1016/j.apenergy.2019.113602
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    References listed on IDEAS

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    1. Liu, Jie & Yang, Fuyuan & Wang, Hewu & Ouyang, Minggao & Hao, Shougang, 2013. "Effects of pilot fuel quantity on the emissions characteristics of a CNG/diesel dual fuel engine with optimized pilot injection timing," Applied Energy, Elsevier, vol. 110(C), pages 201-206.
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    2. Pastor, José V. & García, Antonio & Micó, Carlos & Lewiski, Felipe, 2020. "An optical investigation of Fischer-Tropsch diesel and Oxymethylene dimethyl ether impact on combustion process for CI engines," Applied Energy, Elsevier, vol. 260(C).
    3. Yang, Kailin & Wang, Zhongshu & Zhang, Kechao & Wang, Dan & Xie, Fangxi & Xu, Yun & Yang, Kaiqiang, 2023. "Impact of natural gas injection timing on the combustion and emissions performance of a dual-direct-injection diesel/natural gas engine," Energy, Elsevier, vol. 270(C).
    4. Elsayed Abdelhameed & Hiroshi Tashima, 2022. "EGR and Emulsified Fuel Combination Effects on the Combustion, Performance, and NOx Emissions in Marine Diesel Engines," Energies, MDPI, vol. 16(1), pages 1-22, December.
    5. Mirosław Karczewski & Janusz Chojnowski & Grzegorz Szamrej, 2021. "A Review of Low-CO 2 Emission Fuels for a Dual-Fuel RCCI Engine," Energies, MDPI, vol. 14(16), pages 1-39, August.

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