Journal
APPLIED ENERGY
Volume 261, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2019.114438
Keywords
Dual-fuel combustion; Biogas; Bioethanol; SI engine
Categories
Funding
- CTM -UFMG
- Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES)
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Dual-fuel mode in internal combustion engines has been proved as a potential technique for either achieving near-zero pollutant emissions through fuel reactivity modifications or reducing carbon dioxide (CO2) emissions by partially replacing a fossil fuel by a renewable one. This manuscript presents an experimental study of a dual-fuel engine fueled with two biofuels, biogas and bioethanol, for two liquid fuel replacements of 20 and 50% by energy. Tests were performed in a spark-ignition single-cylinder engine with a modified compression ratio, under different engine speeds (1800 and 3600 rpm) and loads (4 bar of IMEP and full load condition). Results show that dual-fuel mode accelerated the combustion rate when compared to biogas single-fuel operation and increased combustion completeness, leading to reduced carbon monoxide (CO) and unburnt hydrocarbon (HC) pollutant emissions, thus, improving combustion efficiency. At full load conditions, dual-fuel mode suppressed knock occurrence and raised the load limit for 20% biogas energy fraction when compared to ethanol single-fuel condition. Moreover, nitrogen oxides (NOx) emissions were decreased in dual-fuel mode (comparing to ethanol) and fuel conversion efficiencies enhanced considerably. The innovative approach of combining two promising renewable fuels proved to be a very effective methodology in reducing exhaust pollutant emissions and increase engine overall efficiency.
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