EMISSIONS AND PERFORMANCE CHARACTERISTICS OF AN SI ENGINE WITH BIOGAS FUEL AT DIFFERENT CO2 RATIOS

Year 2019, Volume: 5 Issue: 6 - Issue Name: Special Issue 10: International Conference on Progress in Automotive Technologies 2018, Istanbul, Turkey, 131 - 140, 08.10.2019

Yasin Karagöz

https://doi.org/10.18186/thermal.630960

Cited By: 4

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 NO_x 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 NO_x emissions.

Keywords

Biogas, CO2, Methane, SI Engine, Emissions, Combustion

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