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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
ANALYSIS OF COMMON REACTIONS OF A DEVELOPED DIESEL-BIODIESEL COMBINED CHEMICAL SCHEME
Submission Author:
Federico Krauch , Asuncion , Paraguay
Co-Authors:
Hernando Maldonado Colman, Rodney Javier Roman Salinas, DARIO ALVISO, Juan Carlos Rolon
Presenter: Federico Krauch
doi://10.26678/ABCM.ENCIT2016.CIT2016-0231
Abstract
Biodiesel is a complex mixture of methyl esters with different chain lengths and degrees of unsaturated hydrocarbons and can be used in pure form or may be blended with diesel fuel without major modifications in diesel engines. In Paraguay, the fleet market share of diesel vehicles is about 80% (Mario Molina et al 2014). Currently 100% of diesel fuel is imported and only B1 (1% biodiesel) is used. Therefore, the potential in the development of such alternative fuel is enormous. However, changing the fuel in diesel engines induces changes in combustion behavior, which can impact pollutants emission. Indeed, the use of biodiesel in diesel engines decreases emissions of pollutants such as carbon monoxide, unburned hydrocarbons, and particulate matter, although a slight increase in emissions of nitrogen oxides is observed in some cases (Agarwal et al 2007 and Zheng et al 2008). Therefore, a better understanding of diesel-biodiesel blend combustion is needed. This paper presents numerical studies of a new developed diesel-biodiesel combined chemical scheme using a freely propagating premixed flame configuration. The key objective of the study is to identify the reactions that are important in the estimation of flame velocity of diesel-biodiesel blends. The kinetic modelling for diesel-biodiesel blend oxidation was performed using the 1D_PREMIXED code within the REGATH package developed at EM2C laboratory, that takes into account the detailed kinetic and transport phenomena (heat and mass transfer) through a numerical predictive 1D code. A new model for the blend was developed by combining two skeletal kinetic schemes (Andrae et al (2011) for diesel and Luo et al (2012) for biodiesel). The common reactions in both chemical schemes were identified and those with different Arrhenius constants were analysed in order to obtain reasonable flame velocity results using both fuels separately. Then, diesel-biodiesel blends flame velocities were estimated and the premixed flame structure was presented and analysed.
Keywords
Combustion, biodiesel, Diesel, chemical kinetics
