Documentação de convênios
URI permanente desta comunidadehttps://rigalileo.itegam.org.br/handle/123456789/173
Trabalhos ténico-científico oriundos de convênios com universidades para oferta de turmas de mestrado e doutorados no Estado do Amazonas
Navegar
10 resultados
Resultados da Pesquisa
Item Isothermic Gasification Octave(INSTITUTO DE TECNOLOGIA, 2015) MATIAUDA, Mario; DE LEÓN BENÍTEZ, Juan B.; ARTEAGA, Luis Ernesto; FREAZA, Nora; RIVERO, Marta; YACHECEN, Carlos; Eduardo de Magalhães BragaGasification is a process of thermal conversion where solid biomass (sawdust pellets) is transformed into gas by partial oxidation at high temperatures. The model is based on the two-phase theory (bubble - emulsion), suitable for predicting experimental results in reactions occurring in fluidized beds. The model simulation includes mass and energy balances and hydrodynamic studies, with assumptions such as isothermal process behavior.Item Limestone Calcination Optimization of Vertical Container Oven(INSTITUTO DE TECNOLOGIA, 2015) SAGASTUME GUTIÉRREZ, Alexis; Manoel Henrique Reis NascimentoProducing lime demands high energy consumption and leads to significant CO₂ emissions. This study aims to establish a methodology to optimize limestone calcination in standard vertical kilns in Cuba, considering lime quality’s impact on the economic contribution margin. Tools such as exergy analysis and genetic algorithms were used. Major inefficiencies identified include combustion irreversibilities, heat transfer losses, and exergy loss through exhaust gases. Applying the methodology reduced energy consumption by 4.6% and improved lime quality by 5.3%.Item Fluidized bed combustion of sawdust pellets(INSTITUTO DE TECNOLOGIA, 2015) MATIAUDA, Mario; BENÍTEZ, Juan B. de León; FREAZA, Nora; RIVERO, Marta.; Jandecy Cabral LeiteThe study investigates the combustion of sawdust pellets in a fluidized bed, aiming at the energy recovery of solid waste in bioethanol production. Samples of pine and palo blanco were analyzed, focusing on the devolatilization stage and primary fragmentation. Results showed significant differences in thermal behavior and fragmentation between the species, with pine exhibiting less fragmentation and more consistent residues. The theoretical model used predicted devolatilization times, validated experimentally, highlighting the influence of bed temperature and particle diameter.Item Isothermic Gasification Octave: Gasificação isotérmica modelada e simulada com Octave(INSTITUTO DE TECNOLOGIA, 2015) MATIAUDA, Mario; DE LEÓN BENÍTEZ, Juan B.; ARTEAGA, Luis Ernesto; FREAZA, Nora; RIVERO, Marta; YACHECEN, Carlos; Manoel Henrique Reis Nascimento, Dr.Gasification is a thermal conversion process where solid biomass (sawdust pellets) turns into gas by partial oxidation at high temperatures. The model is based on the two-phase theory (bubble-emulsion), suitable for predicting experimental results in fluidized bed reactions. It includes mass and energy balances, and hydrodynamic studies. The simulation is implemented in Octave with a graphical user interface, enabling predictions of the distribution and concentrations of gas species during the process.Item Síntese Hidrotérmica de Zeólitas a Partir de Cinza Volante(Instituto de Tecnologia, 2015) MAUES, Tamiris Cristina de Lima; SOUZA, José Antônio da SilvaFly ash, an industrial waste from coal combustion, was used as raw material for the hydrothermal synthesis of zeolites. The study investigated various experimental conditions, including reagent concentration (NaOH and Na₂CO₃), temperature, reaction time, and synthesis methods (classic and two-phase). The results showed the formation of hydroxysodalite and cancrinite, with the two-phase method at high NaOH concentration (5 M) proving more efficient, promoting quartz destruction and enhancing zeolite crystallization. The presence of calcite in the ash influenced cancrinite formation. The work contributes to the valorization of industrial waste and environmental impact reduction.Item Aplicação do Filtro com Reamostragem por Importância Sequencial (SIR) na Simulação de Dados de Processo de Precipitação: Desenvolvimento de um Aplicativo Computacional para Auxílio na Tomada de Decisão em Refinaria de Alumina(Instituto de Tecnologia, 2015) AZEVEDO JÚNIOR, Cleto Maués; BATISTA, Clauderino da SilvaThis study describes the development of a computational application based on mathematical models of mass balance and particle filters to simulate the precipitation process in the Bayer circuit. The goal is to provide a tool to assist process engineers in daily decision-making, enhancing the control of productivity and alumina quality. Simulated results were compared with real plant data, showing average relative errors of 4.7%, validating the model's effectiveness.Item Qualidade da Lavagem Cáustica: Condição Crucial para o Aumento da Disponibilidade do Sistema em uma Planta Bayer(Instituto de Tecnologia, 2015) BORGES, Américo José Preto; QUARESMA, João Nazareno NonatoA lavagem cáustica é fundamental para as rotinas de uma planta Bayer, limpando equipamentos e sistemas de tubulações para garantir a boa operacionalidade do processo. O estudo mostra que a manutenção da temperatura em patamares de 80°C é essencial para um bom controle da concentração cáustica e que a variável tempo de limpeza perde importância se temperatura e concentração cáustica não estiverem nas faixas de controle estabelecidas. Além disso, quando a solução de limpeza é preparada com soda virgem e licor Bayer, a capacidade de dissolução da solução diminui significativamente em temperaturas abaixo de 75°C.Item Solução de equações de balanço populacional usando a técnica da transformada de Laplace e filtros de partículas ASIR(Instituto de Pesquisas Energéticas e Nucleares, 2015) ROSA, Gabriel; MASSI, MarcosThe solution of population balance equations (PBEs) is essential for modeling processes involving the evolution of particle size distributions in multiphase systems. In this work, the Laplace transform technique was used to convert differential PBEs into algebraic equations, simplifying their resolution. In addition, the Auxiliary Sampling Importance Resampling (ASIR) particle filter method was employed to improve the estimation of particle size distributions. The proposed approach was applied to different systems, demonstrating its efficiency and accuracy in modeling complex phenomena. The results indicate that combining the Laplace transform with particle filters significantly improves the convergence and robustness of the obtained solutions.Item ANÁLISE E IDENTIFICAÇÃO DO MODELO DINÂMICO DO PROCESSO DE COMBUSTÃO EM UM CALCINADOR INDUSTRIAL(Instituto de Tecnologia, 2015) COSTA, Daniella dos Santos Ferreira; SILVA, Orlando FonsecaThis work was developed at Hydro Alunorte's alumina refinery in Barcarena — PA, specifically in the calcination area. Calcination is the process by which all the free water or combined hydrate (Al₂O₃·3H₂O) is eliminated, forming aluminum oxide or simply alumina (Al₂O₃). This reaction requires heating in the combustion chamber with controlled temperature around 1000ºC, located within the stationary fluidized bed calciners. Inside the furnace, a combustion reaction takes place with HFO (Heavy Fuel Oil) as fuel and atmospheric air, which is captured via blowers. The main objective of this work is to identify a representative mathematical model for the combustion process that happens inside the furnace, to further optimize it, thus increasing the energy efficiency of the calciner oven.Item Influência da variação de grãos de amido de arroz, mandioca e milho nas propriedades físicas, mecânicas e de fotodegradação de amido termoplástico(Instituto de Tecnologia, 2018) CRUZ, Isabela Cristina Rodrigues da; Edinaldo José de Sousa CunhaStarch has gained increasing interest as a biodegradable plastic due to its abundance, renewability, and low cost. Different types of starch grains form thermoplastics with varied physico-mechanical properties. This study analyzes the influence of different starch grains (rice, manioc, and corn) in biofilm production. Films were prepared by plasticization with glycerol in an aqueous medium at 100°C for 30 minutes and characterized by physical-chemical analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD), optical microscopy, thermal analysis (TG/DTG), and mechanical tests. The results show that the geometry of the grains and the amylose/amylopectin ratio influence biofilm properties, affecting solubility, gelatinization time, and mechanical stability after radiation exposure.