| 초록 |
The interest in the bio-oil production technology is increasing due to the environmental pollution and energy demand. Bio-oil is a liquid fuel obtained by pyrolyzing the lignocellulosic biomass. Bio-oil, however, has poor fuel properties for direct use in the internal combustion engine; hence, the fuel properties must be improved by adopting an upgrading method. The simplest such method is mixing bio-oil with diesel and alcohol. This direct mixing method has advantages, such as in terms of the calorific value, cetane number, and dissolution of solid particles. In this study, coffee grounds bio-oil was mixed with diesel, n-butanol, and cetane enhancement of 2-EHN, and was applied to a direct-injection compression ignition engine. Engine experiments were conducted under a 2~10 bar IMEP load and 600, 900, and 1200 bar injection pressure using four mixed fuels and diesel. The experiment results showed that the combustion behaviors of all the fuels were comparable to one another, and that the THC, CO, and NOx emissions of the mixed fuels were similar to those of diesel, but the PM mass concentration decreased. |
