Efficient hydrotreated vegetable oil combustion under partially premixed conditions with heavy exhaust gas recirculation

FUEL

卷:268

Article; Proceedings Paper

Hunicz, Jacek¹  Matijosius, Jonas²  Rimkus, Alfredas³  Kilikevicius, Arturas²  Kordos, Pawel¹  Mikulski, Maciej⁴ 

[1] Lublin Univ Technol, Fac Mech Engn, Nadbystrzycka 36, PL-20618 Lublin, Poland

[2] Vilnius Gediminas Tech Univ, Mech Sci Inst, J Basanaviciaus 28, LT-03224 Vilnius, Lithuania

[3] Vilnius Gediminas Tech Univ, Fac Transport Engn, J Basanaviciaus 28, LT-03224 Vilnius, Lithuania

[4] Univ Vaasa, Sch Technol & Innovat, Wolffintie 34, FI-65200 Vaasa, Finland

关键词: HVO;    Diesel engine;    Split injection;    EGR;    Partially premixed combustion;   

DOI  :  10.1016/j.fuel.2020.117350

来源: Elsevier

【 摘 要 】

This study performed a detailed analysis of combustion and emission characteristics of a single-cylinder compression ignition engine fuelled with diesel, hydrogenated vegetable oil (HVO) and their blend (50/50). Taking advantage of the high reactivity of HVO, the aim was to investigate how changes in fuel injection and exhaust gas recirculation (EGR) strategies can achieve partially premixed combustion with superior efficiency and ultra-low engine-out emissions. Without EGR, and with a multi-pulse injection strategy optimized for diesel, combustion timings were the same for all three investigated fuels. HVO exhibited higher tolerance to EGR in terms of combustion retarding, so it was possible to use high recirculation rates. This reduced nitrogen oxides, while maintaining high indicated efficiency. The pilot injection control allowed further extending the EGR dilution limit without incurring trade-offs with combustion efficiency and related carbon monoxide and unburned hydrocarbon emissions. Additionally, heavy EGR conditions supported reduction of soot for all three tested fuels. However, the best trade-off between soot and other emission compounds was observed for HVO. HVO also resulted in the lowest emissions of aldehydes and aromatics. In conclusion, on the given engine platform at a steady-state, mid-load operating point, HVO allowed for 43% indicated thermal efficiency with engine-out nitrogen oxides and carbon monoxide emissions near to Euro VI limits. This efficiency level was 1.5 percentage points above that for the optimized diesel operation.

【 授权许可】

Free