Experimental study on the combustion and emissions fueling biodiesel/n-butanol, biodiesel/ethanol and biodiesel/2,5-dimethylfuran on a diesel engine

The effects of biodiesel and its blends on the combustion and emissions were investigated on a single-cylinder diesel engine fueling three blends included biodiesel/n-butanol, biodiesel/ethanol and biodiesel/2,5-dimethylfuran. The results show that the indicated thermal efficiency (ITE) of pure biod...

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Bibliographic Details
Published in:Energy (Oxford) 2016-11, Vol.115, p.539-549
Main Authors: Zheng, Zunqing, Wang, XiaoFeng, Zhong, Xiaofan, Hu, Bin, Liu, Haifeng, Yao, Mingfa
Format: Article
Language:English
Subjects:
2,5-Dimethylfuran (DMF)
Biodiesel
Diesel engines
Ethanol
Low temperature combustion
n-butanol
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Summary:The effects of biodiesel and its blends on the combustion and emissions were investigated on a single-cylinder diesel engine fueling three blends included biodiesel/n-butanol, biodiesel/ethanol and biodiesel/2,5-dimethylfuran. The results show that the indicated thermal efficiency (ITE) of pure biodiesel and three fuel blends are lower than that of diesel fuel at low load. With the increase of load, pure biodiesel and three fuel blends present higher ITE than that of diesel fuel, especially at high load and high EGR rates. The ability to reduce smoke can be sequenced as E20 > DMF20 > Bu20 > biodiesel. Pure biodiesel, B20 and DMF20 exhibit higher NOx emissions than that of diesel fuel, while E20 has lower NOx emissions than diesel. For three fuel blends, their HC and CO emissions are higher than those of diesel fuel at low load, but lower than diesel at higher loads. It is beneficial to further improve the thermal efficiency and reduce smoke at high load by increasing the blending ratio of high octane number oxygenated fuels. At 50% EGR rate, the soot reduction percentages are 79% and 99.4% for Bu50 and DMF50 respectively compared to diesel, and the thermal efficiency is further improved compared with 20% blending ratio. •Effects of biofuels on combustion and emissions are compared at different loads.•Ethanol addition has lower efficiency, smoke and NOx emissions at 20% blending ratio.•At 50% EGR, Bu50 and DMF50 realize low temperature combustion with low NOx and soot.•Stable combustion and high pressure rise rate are challenges on low cetane fuels.
ISSN:0360-5442
DOI:10.1016/j.energy.2016.09.054