Development of a diesel-biodiesel-ethanol combined chemical scheme and analysis of reactions pathways

Alviso, Darío; Krauch, Federico; Román, Rodney; Maldonado, Hernando; Santos, Rogério Gonçalves dos; Rolon, Juan-Carlos; Darabiha, Nasser

doi:10.1016/j.fuel.2016.11.039

Cited by 23 publications

(11 citation statements)

References 39 publications

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“…However, the cetane number, flash point and calorific value of ethanol are lower than those corresponding to diesel fuel, so it cannot be used directly in diesel engines. Therefore, ethanol must be blended with diesel fuel or biodiesel [2] and, working under the appropriate conditions, the emissions of CO, particulate matter and NO x could be reduced [3].…”

Section: Introductionmentioning

confidence: 99%

High-pressure ethanol oxidation and its interaction with NO

Marrodán

Arnal

Millera

et al. 2018

Fuel

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Ethanol has become a promising biofuel, widely used as a renewable fuel and gasoline additive. Describing the oxidation kinetics of ethanol with high accuracy is required for the development of future efficient combustion devices with lower pollutant emissions. The oxidation process of ethanol, from reducing to oxidizing conditions, and its pressure dependence (20, 40 and 60 bar) has been analyzed in the 500-1100 K temperature range, in a tubular flow reactor under well controlled conditions. The effect of the presence of NO has been also investigated. The experimental results have been interpreted in terms of a detailed chemical kinetic mechanism with the GADM mechanism (Glarborg P, Alzueta MU, Dam-Johansen K and Miller JA, 1998) as a base mechanism but updated, validated, extended by our research group with reactions added from the ethanol oxidation mechanism of Alzueta and Hernández (Alzueta MU and Hernández JM, 2002), and revised according to the present high-pressure conditions and the presence of NO. The final mechanism is able to reproduce the experimental trends observed on the reactants consumption and main products formation during the ethanol oxidation under the conditions studied in this work. The results show that the oxygen availability in the reactant mixture has an almost imperceptible effect on the temperature for the onset of ethanol consumption at a constant pressure, but this consumption is faster for the highest value of air excess ratio (λ) analyzed. Moreover, as the pressure becomes higher, the oxidation of ethanol starts at lower temperatures. The presence of NO promotes ethanol oxidation, due to the increased relevance of the interactions of CH 3 radicals and NO 2 (from the conversion of NO to NO 2 at high pressures and in presence of O 2) and the increased concentration of OH radicals from the interaction of NO 2 and water.

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Section: Introductionmentioning

confidence: 99%

High-pressure ethanol oxidation and its interaction with NO

Marrodán

Arnal

Millera

et al. 2018

Fuel

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“…In a previous work, a diesel-biodiesel-ethanol combined chemical kinetic model and reaction pathways analysis was published by the authors [12]. In that work, however, TRF20 (a mixture of 80% n-heptane and 20% toluene by volume) was chosen as the diesel surrogate.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Chemical kinetic mechanism for diesel/biodiesel/ethanol surrogates using n-decane/methyl-decanoate/ethanol blends

Alviso

Costa

Backer

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Diesel-biodiesel-ethanol blends have been the focus of research in engines, as biodiesel and ethanol additives can lower pollutant emissions while maintaining diesel performance. To facilitate modeling and analysis, those complex fuels are often substituted by simplified surrogate fuels, composed of only a few well-characterized molecules, but displaying similar properties compared to the fuel that they represent. In this context, the objective of this paper is to develop and validate a new chemical reaction mechanism for diesel-biodiesel-ethanol surrogate fuels. n-Decane and methyl-decanoate (MD) were chosen as the diesel and biodiesel surrogates, respectively, as they are frequently used in the literature. As the available reduced methyl-decanoate models do not reproduce the negative temperature coefficient behavior found in auto-ignition delay experiments, the detailed MD model of Dievart et al. was reduced using DRGEP. This last model was then combined with the reduced n-decane model due to Chang et al. and that of ethanol due to Marinov. Validations are performed on 0D constant-volume auto-ignition by comparing auto-ignition delay times and 1D freely propagating gaseous premixed flame configurations by analyzing laminar flame speeds, using the original single component kinetic models, against the combined surrogate kinetic models, and experimental results found in the literature. Laminar flame speeds of n-decane/methyldecanoate/ethanol blends are also presented.

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“…This biodegradable fuel is composed of a mixture of fatty acid alkyl esters with different degrees of unsaturation. BD is used in compression ignition engines in many countries, usually blended up to 20% with petroleum diesel, without major engine modifications [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Flash point, kinematic viscosity and refractive index: variations and correlations of biodiesel–diesel blends

Alviso

Saab

Clevenot

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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This paper presents characterization studies of flash point, kinematic viscosity and refractive index for several biodiesel/ diesel blends. Biodiesel is produced from soybean, corn, olive, canola, almond, grape and peanut oils. Regression equations are presented to estimate the kinematic viscosity, refractive index and flash point of the studied biodiesel and their blends with diesel fossil fuel as a function of the blend composition. Moreover, as viscosity and refractive index measurements are simple, fast and require very small volume of samples, a correlation study for the blends is conducted to estimate the flash point from these two properties. It is shown that when kinematic viscosity and refractive index are both used for the estimation of the blends flash point, the R 2 values are higher than those found using simple correlations.

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Development of a diesel-biodiesel-ethanol combined chemical scheme and analysis of reactions pathways

Cited by 23 publications

References 39 publications

High-pressure ethanol oxidation and its interaction with NO

High-pressure ethanol oxidation and its interaction with NO

Chemical kinetic mechanism for diesel/biodiesel/ethanol surrogates using n-decane/methyl-decanoate/ethanol blends

Flash point, kinematic viscosity and refractive index: variations and correlations of biodiesel–diesel blends

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