An experimental investigation on engine performance and emissions of a supercharged H-2-diesel dual-fuel engine

作者：Roy Murari Mohon^*; Tomita Eiji; Kawahara Nobuyuki; Harada Yuji; Sakane Atsushi

来源：International Journal of Hydrogen Energy, 2010, 35(2): 844-853.

DOI：10.1016/j.ijhydene.2009.11.009

• Dual-fuel engine
• Supercharging
• Alternative fuel
• Hydrogen
• Cogeneration
• EGR

This study investigated the engine performance and emissions of a supercharged engine fueled by hydrogen and ignited by a pilot amount of diesel fuel in dual-fuel mode. The engine was tested for use as a cogeneration engine, so power output while maintaining a reasonable thermal efficiency was important. Experiments were carried out at a constant pilot injection pressure and pilot quantity for different fuel-air equivalence ratios and at various injection timings without and with charge dilution. The experimental strategy was to optimize the injection timing to maximize engine power at different fuel-air equivalence ratios without knocking and within the limit of the maximum cylinder pressure. The engine was tested first with hydrogen-operation condition up to the maximum possible fuel-air equivalence ratio of 0.3. A maximum IMEP of 908 kPa and a thermal efficiency of about 42% were obtained. Equivalence ratio could not be further increased due to knocking of the engine. The emission of CO was only about 5 ppm, and that of HC was about 15 ppm. However, the NOx emissions were high, 100-200 ppm or more. The charge dilution by N-2 was then performed to obtain lower NOx emissions. The 100% reduction of NOx was achieved. Due to the dilution by N-2 gas, higher amount of energy could be supplied from hydrogen without knocking, and about 13% higher IMEP was produced than without charge dilution.

• 出版日期2010-1