Abstract
Nowadays increasing emission regulations and environmental concerns have led to the use of alternative fuels in internal combustion engines. Biogas is an alternative fuel that can be produced with clean, green and natural resources. In this study, a single cylinder, four stroke SI engine was operated at stoichiometric conditions, 2800 rpm constant engine speed with biogas fuel at different ratios. As biogas fuel, methane (CH4) and CO2 were used during engine tests. Test results which were taken by using only gasoline were compared with the results obtained by using biogas fuel at different CO2 ratios (10%, 20%, 30% and 40% by volume). Although it was determined specific CO emissions decrease and THC emissions slightly increases with the increasing CO2 ratio, it is foreseen that the increase in THC emissions can be prevented by the use of three way catalytic converter. Although the NOx emissions increase with the use of biogas compared to gasoline, it was significantly reduced by the increased CO2 rate in the biogas fuel, the CO2's heat carrying capacity and reducing the O2 availability of the fuel. On the other hand, because of the high cost of purification process of biogas and after-treatment equipment, it is foreseen that use of biogas at high ratio of CO2 in SI engines will be advantageous in terms of NOx emissions.
Highlights
Nowadays, as the number of vehicles increases, the percentage of diesel vehicles in the vehicle market increases [1]
Biogas emerges as a clean and environmentally friendly alternative fuel containing methane, CO2 and other gases that can be produced from natural sources [7]
The results show that the use of biogas fuel decreases NOx emissions with a increase HC emissions
Summary
As the number of vehicles increases, the percentage of diesel vehicles in the vehicle market increases [1]. In 2016, the market of diesel vehicles have 49% share among all vehicles in European countries [2] In this case, the emission of NOx and PM emissions increases, affecting the environment and human health negatively [3]. Because of the need of improvement at current battery technology and the inadequacy of charge stations prevents the widespread use of these systems in the near future [6] Due to this reason, it is foreseen that fuel cells will be used to supply very small units’ batteries and increase their range which can be used as range extender in small powers and operated as both serial hybrids and parallel hybrids when necessary. Because of the methane in its content, the use of biogas in in SI engines provides great benefit in terms of emissions [9]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
