IQ - Trabalhos de Conclusão de Curso

URI Permanente para esta coleçãohttp://200.137.215.59//handle/ri/1305

Navegar

Submissões Recentes

Agora exibindo 1 - 3 de 3
  • Imagem de Miniatura
    Item type: Item ,
    Produção sustentável de aço no Brasil: o papel do aço verde na transição energética do setor siderúrgico
    (Universidade Fedral de Goiás, 2026-06-26) Moreira, Carlos Arthur Scapin Jordão Costa Alberto; Dias, Rafael Macedo; Suarez, Carlos Alberto Galeano; Santos, Dyrney Araújo dos; Dias, Rafael Macedo
    This study aimed to analyze the main technological alternatives for the decarbonization of the steel industry, with emphasis on green steel production routes and other sustainable technologies, as well as their application prospects in the Brazilian context. To achieve this, a literature review was conducted based on scientific articles, technical reports, and national and international institutional documents, covering both established processes and emerging technologies, such as Hydrogen Direct Reduced Iron (HDRI), Molten Oxide Electrolysis (MOE), Low-Temperature Electrolysis (LTE), hybrid routes using natural gas, steel scrap recycling, the use of charcoal, and private initiatives aimed at reducing carbon emissions. Additionally, a SWOT (Strengths, Weaknesses, Opportunities, and Threats) analysis was developed to compare the main technologies studied by evaluating their strengths, weaknesses, opportunities, and threats in the context of steel industry decarbonization. The results indicate that the HDRI route combined with the Electric Arc Furnace (EAF) has a high potential for emissions mitigation, reducing CO₂ emissions by up to 95% when powered by green hydrogen and renewable electricity, although it still faces challenges related to hydrogen costs and the availability of clean energy. Technologies such as MOE and LTE present even greater decarbonization potential; however, they remain at an early stage of development and still require validation on an industrial scale. For the Brazilian scenario, the adoption of hybrid routes based on natural gas and green hydrogen, combined with increased steel scrap recycling and the country's renewable electricity matrix, represents a viable strategy to decarbonize the national steel industry while maintaining its competitiveness in response to international environmental requirements. However, the successful implementation of this strategy depends on government policies capable of ensuring the competitiveness of Brazilian steel in the global market
  • Imagem de Miniatura
    Item type: Item ,
    Rotas para produção de combustível de aviação sustentável a partir de algas
    (Universidade Fedral de Goiás, 2026-06-26) Luz, Nimoly Luciana Sampaio; Alonso, Christian Gonçalves; Ostroski, Indianara Conceição; Dias, Isabela Milhomem; Alonso, Christian Gonçalves
    The increasing emissions of carbon dioxide (CO2) and nitrogen oxides (NOx) have intensified the environmental impacts associated with climate change, highlighting the need to develop more sustainable fuels. This study aims to conduct a literature review on the different production pathways of Sustainable Aviation Fuel (SAF) derived from microalgae, through the analysis of the main technological conversion routes certified by the American Society for Testing and Materials (ASTM). The adopted methodology is qualitative in nature, based on a bibliographic survey primarily conducted using the CAPES and ScienceDirect databases. Among the analyzed pathways, Hydroprocessed Esters and Fatty Acids (HEFA), using microalgae oil, Alcohol-to-Jet (AtJ), and Fischer-Tropsch Synthesis (FT) were selected, the latter two through microalgae gasification. Microalgae stand out as a third-generation feedstock due to their high growth rate, high lipid content, ability to capture CO₂, and the possibility of cultivation in wastewater without competing with the food supply chain. The HEFA pathway is currently the most mature; however, when using algal biomass, its Technology Readiness Level (TRL) decreases to 6–7, with a laboratory yield ranging from 55% to 76%. The AtJ pathway presents an overall energy efficiency of 40% and a TRL of 6. Meanwhile, the FT pathway has a lower TRL of 4–6 and utilizes the entire biomass. From an environmental perspective, SAF production from microalgae can reduce greenhouse gas emissions by more than 50% compared to conventional jet fuel over the life cycle. On the other hand, from an economic standpoint, production costs are 2 to 5 times higher than conventional aviation kerosene, with the HEFA pathway showing the greatest potential for cost reduction in the medium term. It is concluded that, although these pathways present advantageous prospects, none currently demonstrates economic competitiveness or scalability that surpasses or matches fossil kerosene production. Therefore, technological advancements and favorable regulatory frameworks are required to enable the commercial viability of SAF derived from microalgae
  • Imagem de Miniatura
    Item type: Item ,
    Validação do código livre OpenFOAM através da obtenção de coeficientes de transferência de calor
    (Universidade Federal de Goiás, 2026-06-22) Costa, Gustavo Henrique; Santos, Dyrney Araújo dos; Santos, Dyrney Araújo dos; Dias, Rafael Macedo; Lopes, Camila Narumi Yano
    The demand for increasingly complex studies on heat transfer is strengthening Computational Fluid Dynamics (CFD) techniques. Among these, the OpenFOAM software stands out due to its free availability and freedom to modify the code. In this sense, there is an urgent need for increasingly rigorous validation of these tools that aim to simulate reality. The validation experiments were all conducted using powerful workstations, and within the software, the buoyantFoam solver was chosen, focused on energy transport due to natural buoyancy forces. It was decided to work with natural convection in different Rayleigh ranges for quiescent air over a horizontal cylinder heated to temperatures that would ensure both compressible systems and systems where incompressibility would be modeled using the Boussinesq approximation. The results obtained were satisfactory when compared to well-established empirical correlations, considering that, for compressible systems, the errors ranged from -0.85% to 9.14%, and for incompressible systems the errors fell between -5.90% and -0.51%.