Banca de DEFESA: MARCIO AUGUSTO SAMPAIO DE CARVALHO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : MARCIO AUGUSTO SAMPAIO DE CARVALHO
DATA : 24/09/2020
HORA: 14:00
LOCAL: videoconferência na plataforma RNP (sala PEI-UFBA)
TÍTULO:

STUDY OF DIETHYL ETHER AS AN ADDITIVE IN DIESEL MIXTURES,BIODIESEL AND ETHANOL APPLIED TO IGNITION ENGINES BY COMPRESSION

PALAVRAS-CHAVES:

Diesel engines, biofuels, ethanol, biodiesel, DEE.

PÁGINAS: 110
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Produção
RESUMO:

One of the main ways of NOx mitigation in diesel engines is by reducing combustion temperatures. In this way, combinations of biofuels and additives, such as ethanol and ether, can serve this purpose, bringing environmental benefits and diversifying the energy matrix. The presence of oxygen in ethanol also makes it possible to reduce particulate matter (PM) emissions. However, the low cetane number (CN) is one of the main adverse points for its application. In this work, a study was carried out on the use of ethanol and diethyl ether (DEE) in mixtures with diesel and biodiesel fuels. DEE was used to improve the NC of mixtures of diesel and biodiesel with ethanol. Three experimental procedures were developed: the first one used fossil diesel (D100), B20 (80% diesel + 20% biodiesel), B20E (B20 + 10% ethanol) and B20E + DEE (B20E + 5 % of DEE); in the second, in another engine, the D100, B100 (pure biodiesel), the BE20 (80% biodiesel + 20% ethanol) and the BE20 + DEE (BE20 + 5% DEE) were tested; in the third experiment, a multivariate analysis was performed using a response surface, which sought to analyze the effects of variations in the ethanol, DEE and B20 components on performance and emissions results. The results of using B20E (experiment 1) showed a decrease in NOx emissions compared to B20 and D100. However, with the use of BE20 (experiment 2) the results showed an increase in NOx emissions in relation to B100 and D100. In each of these tests, the addition of DEE to the mixtures BE20 and B20E, in turn, showed a reduction in NOx emissions in relation to all the fuels of the comparatives in medium and high loads. In the multivariate analysis experiment, considering the minimum and maximum limits used, it was possible to verify the tendency of NOx increasing with the increase in ethanol and the tendency to decrease with the increase in DEE. PM emissions (measured in experiment 1) decreased with the use of ethanol and, even more, with DEE, compared to D100 and B20. Emissions from unburned hydrocarbons (THC) and CO, however, showed an increasing trend with the use of ethanol and DEE in relation to basic fuels. The efficiency of the engine with the fuels tested, in general, showed similarity, considering variations of up to 5% in relation to the averages of the results. The increase in NOx emissions with the use of high ethanol fractions was attributed to the reduction in the NC of the mixtures. The use of DEE proved to be an effective way to increase the NC of mixtures with ethanol (B20E and BE20). In these mixtures, the high vaporization enthalpy, due to ethanol, combined with the high NC, due to DEE, provided positive compromises such as lower NOx, MP emissions, and high engine efficiency.

MEMBROS DA BANCA:
Externo à Instituição - CARLOS ANTONIO CABRAL DOS SANTOS
Presidente - 286723 - EDNILDO ANDRADE TORRES
Externo à Instituição - JOSÉ RICARDO SODRÉ
Interno - 2058938 - JULIO AUGUSTO MENDES DA SILVA
Externo à Instituição - Jorge José Gomes Martins
Externo à Instituição - José Carlos Charamba Dutra
Externo ao Programa - 1743075 - VITOR PINHEIRO FERREIRA