Heats of combustion of biofuels obtained by pyrolysis and by transesterification and of biofuel/diesel blends |
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Authors: | Edimar DeOliveira Rafael L Quirino Paulo AZ Suarez Alexandre GS Prado |
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Institution: | aInstituto de Química, Universidade de Brasília, Caixa Postal 4478, 70904-970 Brasília, DF, Brazil |
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Abstract: | The obtained heats of combustion were 46.65 ± 0.20; 38.09 ± 0.31; 39.67 ± 0.22; 41.88 ± 0.31; 37.86 ± 0.46; 39.89 ± 0.09; 41.28 ± 0.31 MJ/kg for diesel, transesterified soybean oil, pyrolysed soybean oil and crude soybean oil, transesterified palm tree oil (Elaeis sp.), pyrolysed palm tree oil, crude palm tree oil, respectively. The results show the heats of combustion of biofuels are approximately 17% smaller than traditional diesel. The data also show the heats of combustion depend on the methodology used for the biofuel production. Addition of biofuels to traditional diesel fuel results in a linear decrease of the heat of combustion with the amount of the alternative fuel added to the diesel. However, for blends with 5% biofuels, which is the limit demanded by Brazilian legislation, no significant decrease of the heat of combustion of the commercial diesel was observed. |
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Keywords: | Biofuel/diesel blends Heat of combustion Vegetable oils |
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