Journal
ENERGY
Volume 47, Issue 1, Pages 515-521Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2012.09.020
Keywords
n-butanol; Low temperature combustion; Fuel property; Emissions
Categories
Funding
- National Science Foundation of China [51106109]
- National Science Foundation of China through the project of Outstanding Young Scholarship Award [51125026]
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Compared with ethanol or methanol, butanol has higher heating value and higher miscibility. Because of lower cetane number of butanol, butanol-diesel blends are more suitable for diesel low temperature combustion (LTC). In the paper, experimental study was carried out on a modified single cylinder heavy duty diesel engine to investigate the effects of n-butanol and EGR on diesel engine's combustion and emission characteristics. CA50 timing was fixed at 8 degrees CA ATDC and two different volume fractions (20% and 40%) of n-butanol were blended into diesel fuel. The results showed that with the increase of n-butanol fraction, ignition delay prolonged, (dp/d phi)(max) increased and indicated thermal efficiency (ITE) had a slight increase. Fuel properties had little effects on NOx emission, but NO proportion decreased and NO2 proportion increased with higher n-butanol fraction. With n-butanol addition. CO and THC (total hydrocarbon) emissions decreased at higher EGR levels, soot emissions reduced greatly and soot-bump was almost eliminated. With the increase of EGR rate, CH4 proportion increased, but n-butanol addition could decrease CH4 proportion. (C) 2012 Elsevier Ltd. All rights reserved.
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