Loading...
Publication
Produção de CO2 em motores Otto e Atkinson em que o combustível é uma mistura de hidrogénio e gasolina
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 5 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Atualmente, o setor automóvel é responsável por uma parte significativa das emissões
de poluentes atmosféricos, especialmente dióxido de carbono, pelo que é essencial
a substituição de combustíveis fósseis por alternativas menos poluentes, como o hidrogénio.
O presente trabalho tem como objetivo analisar o impacto da adição de
hidrogénio à gasolina, representada pelo nonano, ao nível da composição dos produtos
de reação, das temperaturas atingidas e do calor libertado durante a combustão.
Para isso, recorreu-se a modelos matemáticos que permitiram variar a quantidade
de hidrogénio no combustível e o excesso de ar na mistura reagente. Posteriormente,
comparou-se os resultados obtidos com os de um estudo de referência realizado por
Heywood. Desta forma, concluiu-se que a adição de hidrogénio no combustível tende
a diminuir as emissões de dióxido de carbono e monóxido de carbono, para além de
aumentar as temperaturas atingidas durante a combustão. Adicionalmente, para a
mesma massa de combustível, a presença de hidrogénio contribui para o aumento
da energia libertada. No entanto, para misturas reagentes de igual volume, a adição
de hidrogénio tende a diminuir essa energia.
Nowadays, the automotive sector is responsible for a significant portion of air pollutant emissions, specially carbon dioxide,so it is essential to replace fossil fuels with less polluting alternatives, such as hydrogen. The purpose of this study is to analyze the impact of adding hydrogen to gasoline, represented by nonane, in terms of the composition of the flue gases, the temperatures reached and the energy released during combustion. To do this, mathematical models were used to vary the amount of hydrogen in the fuel and the excess of air in the reactant mixture. The results obtained were compared with those of a reference study carried out by Heywood. It was concluded that adding hydrogen to the fuel tends to reduce the emissions of carbon dioxide and carbon monoxide, as well as increasing the temperatures reached during combustion. Furthermore, for the same mass of fuel, the presence of hydrogen contributes to an increase in energy released. However, for reactant mixtures with the same volume, adding hydrogen tends to decrease this energy.
Nowadays, the automotive sector is responsible for a significant portion of air pollutant emissions, specially carbon dioxide,so it is essential to replace fossil fuels with less polluting alternatives, such as hydrogen. The purpose of this study is to analyze the impact of adding hydrogen to gasoline, represented by nonane, in terms of the composition of the flue gases, the temperatures reached and the energy released during combustion. To do this, mathematical models were used to vary the amount of hydrogen in the fuel and the excess of air in the reactant mixture. The results obtained were compared with those of a reference study carried out by Heywood. It was concluded that adding hydrogen to the fuel tends to reduce the emissions of carbon dioxide and carbon monoxide, as well as increasing the temperatures reached during combustion. Furthermore, for the same mass of fuel, the presence of hydrogen contributes to an increase in energy released. However, for reactant mixtures with the same volume, adding hydrogen tends to decrease this energy.
Description
Keywords
hydrogen combustion gasoline pollutant emissions energy released combustion temperatures Hidrogénio Combustão Gasolina Emissão de poluentes Energia libertada Temperaturas de combustão