965 resultados para Sistemi energetici gas vapore impianto combinato energia


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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Agronomia (Energia na Agricultura) - FCA

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Pós-graduação em Agronomia (Energia na Agricultura) - FCA

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No Pará, quase 21% de sua população, não tem acesso ao uso da energia elétrica na sua residência. Neste universo está o público alvo deste trabalho que são as comunidades isoladas. Dado a extensão territorial e a extensa bacia hidrográfica do Estado do Pará, estas comunidades dificilmente serão atendidas por extensão da rede de distribuição. A proposta deste trabalho consiste na sugestão de uso do caroço de Açaí como biomassa para um gaseificador indiano de 1 Kg/hora, co-corrente e topo aberto, adaptado e adequado às especificidades da região; o sistema de gaseificação é acoplado a um gerador de 2 KVA (Diesel ou Gasolina), para suprir com energia elétrica as comunidades isoladas, onde já existe a biomassa como resultado do processamento do Açaí e que vem sendo tratada como lixo. Neste contexto, foram pesquisados os programas governamentais que podem respaldar esta proposta, utilizando-a como uma das muitas opções de atendimento de energia elétrica através das fontes alternativas.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Engenharia Mecânica - FEG

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This paper is proposed the usage of an Organic Rankine Cycle (ORC) along with waste heat recovery from an inconstant heat source. This method of waste heat recovery with intermittent heat source is part of a technical viability study. This paper also brings up the usage of thermal energy storage as heat source for the ORC. This paper is based on a heat treatment company study in which a natural gas furnace is explored. Data such as mass flow, temperature and specific waste gas heat from this furnace are used through calculations. Calculations are made also based on furnace cycles. This viability study considers a series of working fluids such as ammonia, benzene, R113 and R134a. Results point out that ORC with out thermal storage and using refrigerant fluid ammonia is the best alternative

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This paper presents a study based on literature and examples found on literature of the potential of petroleum gas to be used as a primary source to generate electricity. The steady increase electricity demand in Brazil makes desirable an effective use of all available primary sources, combined with this need the momentum of the country with the discovery of the presalt reserves becomes interesting the use of this gas, often wasted, for generating electricity. The electricity generation in this work is illustrated by the cogeneration in oil refining plants that have the combined cycle thermal operation. The ultimate goal is to provide a text to identify the advantages, disadvantages and trends of this type of generation

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The process of steel production emits a large quantity of greenhouse gases, specifically carbon dioxide (CO2), and the reduction of such emissions is one of the main challenges for the industry in the 21st. Century. To quantify these emissions, the Worldsteel Association (association of the 170 large steel manufacturers of the world) published a methodology (CO2 Emission Data Collection) for calculation and comparison of CO2 emissions among its members. After that, in 2010, this methodology became an ISO (International Organization for Standardization) norm. Today, the calculation of the CO2 emissions in steel making companies follow the ISO 14404-1 for units with blast furnaces and the ISO 14404-2 for units with electric furnaces. In the last years, new technologies were and continue to be developed for the steel making sector aiming at energetic improvements and greenhouse gas reductions (mainly CO2) by the several processes involved in the production of steel. This work had the objective of producing a tool to calculate the CO2 emissions for the steel making sector. An Excel spreadsheet was developed to calculate the emission intensities of CO2 of a steel plant, the Usina Presidente Vargas, of the Companhia Siderúrgica Nacional (CSN). The spreadsheet furnishes results of CO2 emissions and energetic fluxes, and simulates the benefits that some of the new technologies can give to the company. The spreadsheet calculates the emissions in two ways: a) based on the carbon fluxes that enter the unit, and b) based on the emissions of each specific process within the unit (coking, sinterization, blast furnace, among others)

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Pós-graduação em Engenharia Mecânica - FEG

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)