Abstract
Power generation systems using waste biomass have attracted attention. Biomass gas has relatively low energy density compared to other conventional gaseous fuels. Therefore, a lower stability of combustion and ignition is expected. In this regard, the subject of this research is to achieve the same high thermal efficiency and low exhaust gas emission of turbo charged gas engine while using biogas. In this paper, effects of excess air ratio and ignition timing were investigated, focusing on the combustion and exhaust characteristics.