Diesehol CI Engine Performances, Regulated and Nonregulated Emissions Characteristics

• Published in: Energy & fuels Vol. 24; no. 2; pp. 828 - 833
• Main Authors: Liu, Jie, Liu, Shenghua, Wei, Yanju, Li, Yi, Li, Guangle, He, Hun
• Format: Journal Article
• Language: English
• Published: American Chemical Society 18.02.2010
• Subjects: Combustion
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/ef900930a

The blended fuel of diesel and ethanol is known as diesehol. In this paper, pure diesel and three kinds of diesehols, containing 10, 20, and 30% of ethanol by volume, were used to investigate the effects of ethanol/diesel ratio on engine power, thermal efficiency and emissions, especially the exhaust ethanol and formaldehyde emissions. Experimental results indicate that with the increase of ethanol fraction in the fuel blends, the engine power is decreased to some extent, while the brake thermal efficiency improves slightly and the diesel equivalent BSFC decreases. CO emission increases at low load, while decreases at high load. NO x emission has almost no change and smoke emission decreases significantly at higher engine load conditions. The NO x /smoke trade-off correlation has been improved obviously. A gas chromatograph is calibrated and used to measure the ethanol and formaldehyde emissions. Measurement indicates that ethanol emissions increase with the increase of its content in the blends and changes little with engine load; formaldehyde emission has a good linear relationship with the amount of cyclically supplied ethanol when the engine fueled with diesehol. Because the response of the flame ionization detector to ethanol is 1.7 times that of C1 and it has no response to formaldehyde, the total hydrocarbon emission of the engine is revised accordingly.