Optimizing combustion and emissions in natural gas/diesel dual-fuel engine with pilot injection strategy

Liu, Junheng; Zhao, Wenyao; Zhang, Xuchao; Ji, Qian; Ma, Hongjie; Sun, Ping; Wang, Pan

doi:10.1016/j.tsep.2024.102418

Cited by 6 publications

(1 citation statement)

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“…Sattarzadeh, Park, and Lee have investigated the effect of fuel mode and substitution rates on the combustion and emission performance of engine 29 – 31 . Liu experimentally investigated the variation patterns of NG energy substitution rate and pilot diesel injection time under single injection strategy and split injection strategy 32 , 33 . The low-pressure post-injection (LPPI) strategy was proposed by Lu 34 .…”

Section: Introductionmentioning

confidence: 99%

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

Yu,

Gao,

Zhang

et al. 2024

Sci Rep

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The scavenging process significantly affects the combustion and emission performance of marine low-speed two-stroke dual-fuel engines. Optimizing scavenging air pressure and temperature can enhance the engine's combustion efficiency and emission control performance, thereby achieving more environmentally friendly and efficient operation of dual-fuel engines. This study focuses on marine low-speed two-stroke dual-fuel engines, analyzing the effects of scavenging air pressure (3.0 bar, 3.25 bar, 3.5 bar, and 3.75 bar) and scavenging air temperature (293 K, 303 K, and 313 K) on engine performance and emission products. The results indicate that scavenging air pressure has a greater impact on engine performance than scavenging air temperature. An increase in scavenging air pressure leads to higher thermal efficiency and power. As the scavenging air pressure increases from 3 to 3.75 bar, the indicated thermal efficiency (ITE) increases from 44.02 to 53.26%, and indicated mean effective pressure (IMEP) increases by approximately 0.35 MPa. Increased scavenging air pressure improves nitrogen oxide (NOx) and hydrocarbons (HC) emissions. For every 0.25 bar increase in scavenging air pressure, NOx emissions decrease by 3.53%, HC emissions decrease by 33.35%, while carbon dioxide (CO2) emissions increase by 0.71%. An increase in scavenging air temperature leads to lower ITE and IMEP. As the air temperature changes from 293 to 313 K, the ITE decreases by approximately 1%, and IMEP decreases by about 0.04 MPa. Increased scavenging air temperature improves CO2 emissions. For every 10 K increase in the air temperature, the CO2 emissions decrease by 0.02%, while NOx emissions increase by 4.84%, HC emissions increase by 34.39%. Therefore, controlling scavenging air pressure is more important than scavenging air temperature in the operational management of marine two-stroke engines. Higher power and lower NOx and HC emissions can be achieved by increasing the scavenging air pressure.

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