Improving PM-NOx trade-off with paraffinic fuels: A study towards diesel engine optimization with HVO

FUEL

卷:265

Article

Dimitriadis, Athanasios¹  Seljak, Tine²  Vihar, Rok²  Baskovic, Urban Zvar²  Dimaratos, Athanasios³  Bezergianni, Stella¹  Samaras, Zissis³  Katrasnik, Tomaz² 

[1] Ctr Res & Technol Hellas CERTH, Chem Proc & Energy Resources Inst, 6Km Charilaou Thermi, Thessaloniki, Greece

[2] Univ Ljubljana, Fac Mech Engn, Askerceva 6, SI-1000 Ljubljana, Slovenia

[3] Aristotle Univ Thessaloniki, Lab Appl Thermodynam, POB 458, GR-54124 Thessaloniki, Greece

关键词: Renewable diesel;    HVO;    PM-NOx trade off;    Main injection timing;    Pilot injection timing;    Injection pressure;   

DOI  :  10.1016/j.fuel.2019.116921

来源: Elsevier

【 摘 要 】

The current work investigates the impact of a paraffinic fuel on combustion and emissions of a diesel engine, examining alternative injection strategies for the full exploitation of the fuel characteristics. The paraffinic fuel used was the HVO (Hydrotreated Vegetable Oil) produced by Neste Oil with the brand name NEXBTL. The study was conducted on a light-duty turbocharged and aftercooled common-rail diesel engine, with both HVO and a conventional diesel fuel. Four steady-state operating points were examined, at low and medium engine speeds (1500 and 3000 rpm) and loads (35 and 100 Nm), typical of daily driving of a passenger car. The key contribution of the study is a comprehensive analysis of the phenomena influencing the crank angle resolved in-cylinder parameters, as well as interlinking the effects of different variations of injection pressure (default and 300 bar higher), pilot injection timing (default and +/- 5 degrees CA) and main injection timing (default and +/- 2 degrees CA) on gaseous emissions and particulate matter (PM). The findings have shown that at default engine settings the use of HVO results in up to 40% reduction of engine-out PM and HC emissions without appreciable changes in NOx emissions. The significant reduction of engine-out PM levels, facilitates the adoption of measures for NOx emissions limitation. The latter are reduced by up to 20% when the main injection timing is retarded (by 2 degrees CA in the present study), while PM emissions are still kept well below the respective diesel fuel levels.

【 授权许可】

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