Publicação
Estudo de biocombustíveis sólidos: importância das cinzas para processos de combustão
| Resumo: | Combustion of biomass was one of the earliest ways of energy conversion used by men. Even today biomass remains the most important energy resource immediately available to a sizeable fraction of the human population in developing countries and is becoming increasingly important as a renewable energy source in developed countries. In fact, successive efforts have been made in order to implement more renewable energy sources and biomass is now seen as an important contender to substitute fossil fuels. But the large scale use of biomass as an energy source, and even more, biomass residues, should be accompanied by the development of theoretical and practical knowledge about the problems and difficulties its use can bring. One of the most important aspects of biomass combustion is the production and behavior of ash, the major residue of these energy conversion systems. This thesis is born out of a collaboration between LNEG (Laboratório Nacional de Energia e Geologia) and FCT (Fundação para a Ciência e Tecnologia) that integrates the BiomAshTech project. This project intends to study the production and behavior of ashes of some important national biomass mixtures, and those focused in this work were: almond shell, almond shell with almond, olive cake/kernel and olive kernel. This study presents the chemical analysis, as well as some analytical methods that allow the identification of the most important compounds in the biomass ashes. These biomass mixtures were then subjected to a thorough investigation using mathematical indices and thermodynamic modelization of ash formation with FactSageTM that allowed the identification of those with problematic behaviour, like slagging, sintering and fouling propensity during combustion. |
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| Autores principais: | Salgueiro, Tomé Guerreiro de Oliveira |
| Assunto: | Biomassa Cinza Combustão Composição da cinza Comportamento da cinza Teses de mestrado - 2015 |
| Ano: | 2015 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | português |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | Combustion of biomass was one of the earliest ways of energy conversion used by men. Even today biomass remains the most important energy resource immediately available to a sizeable fraction of the human population in developing countries and is becoming increasingly important as a renewable energy source in developed countries. In fact, successive efforts have been made in order to implement more renewable energy sources and biomass is now seen as an important contender to substitute fossil fuels. But the large scale use of biomass as an energy source, and even more, biomass residues, should be accompanied by the development of theoretical and practical knowledge about the problems and difficulties its use can bring. One of the most important aspects of biomass combustion is the production and behavior of ash, the major residue of these energy conversion systems. This thesis is born out of a collaboration between LNEG (Laboratório Nacional de Energia e Geologia) and FCT (Fundação para a Ciência e Tecnologia) that integrates the BiomAshTech project. This project intends to study the production and behavior of ashes of some important national biomass mixtures, and those focused in this work were: almond shell, almond shell with almond, olive cake/kernel and olive kernel. This study presents the chemical analysis, as well as some analytical methods that allow the identification of the most important compounds in the biomass ashes. These biomass mixtures were then subjected to a thorough investigation using mathematical indices and thermodynamic modelization of ash formation with FactSageTM that allowed the identification of those with problematic behaviour, like slagging, sintering and fouling propensity during combustion. |
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