20.500.12556/RUL-127977 Complementing syngas with natural gas in spark ignition engines for power production effects on emissions and combustion Power generation units based on the bio-syngas system face two main challenges due to (i) the possible temporary shortage of primary sources and (ii) the engine power derating associated with the use of low-energy density fuels in combustion engines. In both cases, an external input fuel is provided. Hence, complementing syngas with traditional fuels, like natural gas, becomes a necessity. In this work, an experimental methodology is proposed, aiming at the quantification of the impact of the use of both natural gas and syngas in spark ignition (SI) engines on performance and emissions. The main research questions focus on investigating brake thermal efficiency (BTE), power derating, and pollutant emission (NO$_x$, CO, THC, CO$_2$) formation, offering quantitative findings that present the basis for engine optimization procedures. Experimental measurements were performed on a Toyota 4Y-E engine (a 4-cylinders, 4-stroke spark ignition engine) at partial load (10 kW) under different syngas energy shares (SES) and at four different spark ignition timings (10°, 25°, 35° and 45° BTDC). Results reveal that the impact of the different fuel mixtures on BTE is negligible if compared to the influence of spark advance variation on BTE. On the other hand, power derating has proven to be a limiting factor and becomes more prominent with increasing SES. An increasing SES also resulted in an increase of CO and CO$_2$ emissions, while NO$_x$ and THC emissions decreased with increasing SES. spark ignition engines renewable fuels combustion syngas natural gas motorji s prisilnim vžigom obnovljiva goriva zgorevanje sintezni plin zemeljski plin true false true Angleški jezik Slovenski jezik Članek v reviji 2021-06-30 10:44:56 2021-06-30 10:44:59 2022-09-07 04:12:31 0000-00-00 00:00:00 2021 0 0 18 str. iss. 12, art. 3688 Vol. 14 Jun. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.43:662.767 1996-1073 10.3390/en14123688 68666115 RAZ_Caligiuri_Carlo_2021.pdf RAZ_Caligiuri_Carlo_2021.pdf 1 274530F94B01B97DB3AE468A08D73177 238aff27cf9c1e81f89b867d1d39d864150c618c29e534dbf9928867e7208497 c8a5e5f0-b0d7-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=155163 https://www.mdpi.com/1996-1073/14/12/3688 1 55377f0f-d97f-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=144597 Fakulteta za strojništvo 0 0 0