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Comparative Study on Premixed Combustion of Biodiesel Isomeric Surrogate Fuels Methyl Butanoate and Ethyl Propanoate
Received date: 2016-05-27
Revised date: 2016-07-20
Online published: 2016-08-30
A comparative study on premixed combustion (equivalence ratios are 0.8) of two biodiesel isomeric alternative fuels methyl butanoate and ethyl propanoate is investigated under the CO2/O2/Ar atmosphere. The isomerization effects of biodiesel alternative fuels on main products, intermediates and radicals are analyzed with particular emphasis on the chemical effects of CO2 addition on two alternative fuels combustion. An analysis of potential pollutants formations is carried out. The results show that, CO2 addition suppresses formations of the precursors of soot e.g. acetylene and propargyl in two flames. The dilution and thermal effects of CO2 addition are more significant on inhibiting the formation of C2H2 in ethyl propanoate flame, while in methyl butanoate are more considerable on reducing C3H3 mole fraction. Moreover, the chemical effects of CO2 addition make a further suppression on C2H2 and C3H3. Furthermore, the addition of CO2 leads to a decrease in the unconventional emissions aldehydes and ketones in the alternative fuels, especially significant for formaldehyde and acetaldehyde in ethyl propanoate flame. In the two flames, the decrease in CH2O is due to the dilution and thermal effects of CO2 addition, while the chemical effects of CO2 addition are the dominant factor on suppressing CH3CHO. Known from product consumption rate analysis, the main reaction responsible for methyl butanoate consumption is dehydrogenation reaction MB+H=H2+MB2J, while the main reaction responsible for ethyl propanoate is decomposition reaction EP=C2H5COOH+C2H4.
Key words: biodiesel surrogate fuels; isomerization; remixed flame
FAN Jing-wei , LIU Dong . Comparative Study on Premixed Combustion of Biodiesel Isomeric Surrogate Fuels Methyl Butanoate and Ethyl Propanoate[J]. Advances in New and Renewable Energy, 2016 , 4(4) : 253 -265 . DOI: 10.3969/j.issn.2095-560X.2016.04.001
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