Minérios de ferro do Brasil como transportadores de oxigênio para aplicação em processos de combustão com recirculação química

• Ano de defesa: 2019
• Autor(a) principal: Nascimento, Rebecca Araújo Barros do
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Brasil; UFRN; PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIA E ENGENHARIA DE MATERIAIS
• Palavras-chave em Português: Efeito estufa; Captura de CO2; Combustão com recirculação química; CLC; Minério de ferro; CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
• Link de acesso: https://repositorio.ufrn.br/jspui/handle/123456789/27227

The thermal power generation sector is the largest emitter of CO2 among all industrial sectors. With the heavy reliance on fossil fuels for power generation, CO2 Capture and Storage technologies (CCS) are emerging as an important option to reduce global CO2 emissions. Chemical Looping Combustion (CLC) technology gained special attention because of its inherent CO2 capture advantage with minimal energy penalty and low cost, especially for power generation. The performance of this technology depends on the proper selection of the oxygen carrier. Materials such as iron-based ores are considered low-cost, abundant in Brazil and are the most widely used as an oxygen carrier in CLC applications. In view of this, this dissertation aims to select iron ore from Rio Grande do Norte and Minas Gerais as promising to be evaluated in CLC processes. The techniques and methodologies used were XRay Flux (XRD), X-Ray Diffraction (XRD), Programmed Temperature Reduction (RTP), fracture resistance, friction loss and thermogravimetric reactivity. Due to the structural characteristics and the reactivity tests it can be considered that the minerals have a percentage of reducible iron for considerable CLC applications, also that the ore particles were fully regenerated after the third cycle, but the Ita-RN presented mechanisms of reduction and oxidation simpler. The iron ores have good mechanical strength and high resistance to friction presented by Ita-RN and Magnetita. Finally, iron ores achieved a high reactivity and conversion rate with methane as the fuel gas. It is therefore possible to infer them as promising materials for applications in CLC processes.