Combustion and Exhaust Emissions of Biogas Dual-Fuel Engines

Eiji Tomita*, Nobuyuki Kawahara, Ulugbek Azimov

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

1 Citation (Scopus)


Biogas can be utilized in dual-fuel engines because of higher thermal efficiency. Biogas is supplied from intake port and liquid diesel fuel is injected in the cylinder directly. The combustion starts from the autoignition of a mixture of vaporized liquid fuel, further igniting biogas and air mixture. The initial combustion occurs at multi points, leading to certain and stable ignition followed by turbulent combustion. At first, visualization of the dual-fuel combustion with micro pilot injection is presented. The effects of liquid fuel injected, biogas flow rate, load, carbon dioxide (CO2) ratio in biogas, exhaust gas recirculation (EGR), compression ratio, H2 addition, pre-heating and other parameters are reviewed based on the literatures. Next, an example of the combustion achieving higher output and thermal efficiency with micro pilot dual-fuel combustion is described, as well as exhaust emissions. After the premixed mixture is autoignited in the end-gas region in latter half of the combustion, pressure oscillation does not occur in some conditions and transition to abnormal knocking combustion is avoided. The effect of CO2 ratio on PREMIER combustion was investigated and it was found that with higher concentrations of CO2 it was easier to keep control of PREMIER combustion.

Original languageEnglish
Title of host publicationBiogas Combustion Engines for Green Energy Generation
Place of PublicationHeidelberg, Germany
Number of pages30
ISBN (Electronic)9783030945381
ISBN (Print)9783030945374
Publication statusPublished - 2022

Publication series

NameSpringerBriefs in Applied Sciences and Technology
ISSN (Print)2191-530X
ISSN (Electronic)2191-5318


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