Browsing by Author "Figueiredo, Robson Lage"

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    Analysis of the energy efficiency of diesel oil consumption in the Brazilian Iron Ore Mining Company.
    (2018) Fernandes, Eunírio Zanetti; Leal, Elisângela Martins; Figueiredo, Robson Lage; Reis, Gemírson de Paula dos
    This paper aims to evaluate the diesel oil consumption between 2008 and 2015 in the production of iron ore in Brazil, creating correlations between energy intensity (production), economy and checking the impact of fuel prices on the commodity. During the analyzed period, the years 2008-2009 indicated economic crises, which interfered in the price and the commercialization of iron ore products. The physical intensity was 0.2% higher than the economic intensity. In the period from 2010 to 2014, economic activity remained more stable, with a decreasing trend, mainly due to the increase of iron ore prices. The physical intensity is much higher than the economic intensity influenced by the expansion of the Chinese economy. The year of 2014 indicated the end of the high iron ore price cycle and the beginning of supply and demand stabilization with consequent reduction in prices. In 2015, the market entered the stabilization phase, with a continuous reduction in unit production costs and transportation logistics. There was an abrupt change due to the strong increase of the economic intensity due to the fall of the international prices of iron ore. The diesel oil consumption plays a vital role in the scenario of cost reduction in iron ore production and a deeper analysis must be done in order to discover some options to change the energy matrix.
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    Desenvolvimento de um sistema de monitoramento aplicado a um motogerador a diesel com injeção de gás de eletrólise visando redução de consumo de combustível.
    (2018) Figueiredo, Robson Lage; Leal, Elisângela Martins; Rêgo Segundo, Alan Kardek; Zanetti, Eunírio; Leal, Elisângela Martins; Rêgo Segundo, Alan Kardek; Zanetti, Eunírio Fernandes; Bortolaia, Luis Antônio; Pinto, Paulo Raimundo
    Este trabalho apresenta o desenvolvimento de um sistema de monitoramento aplicado a um motogerador a diesel com a injeção de gás proveniente do processo de eletrólise, visando a redução do consumo de óleo diesel no motor. O óleo diesel é o combustível principal e o hidrogênio é o combustível secundário (aditivo), injetado juntamente ao ar de admissão. Este estudo é de caráter experimental e consiste, inicialmente, em caracterizar um dispositivo gerador de hidrogênio por meio da avaliação da vazão volumétrica de gás produzido em função da corrente elétrica, da concentração de eletrólito e da temperatura do sistema. Após a caracterização, o gás produzido rico em hidrogênio é utilizado em um motogerador. Foram adotados como parâmetros de estudo o tempo de funcionamento do motor com aplicação de cargas resistivas. Uma interface foi criada utilizando um display LCD 20x4, que apresenta as variáveis do sistema ao usuário. O sistema de monitoramento da célula, do motor e do gerador foi desenvolvido utilizando as plataformas Arduino, Platform IO e Visual Studio. Desta forma, o sistema proposto permite monitorar as variáveis da célula eletrolítica (temperatura, corrente e tensão), do motor (consumo e rotação) e do gerador (potência, corrente e tensão). Os principais resultados encontrados comprovaram a redução entre 2,5% e 5,1% no consumo do combustível principal devido a injeção de hidrogênio no óleo diesel.
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    Development of a low-cost instrumentation system applied to an electrolytic cell.
    (2020) Reis, Gemírson de Paula dos; Matos, Saulo Neves; Rêgo Segundo, Alan Kardek; Leal, Elisângela Martins; Figueiredo, Robson Lage
    Humanity’s growing long-term energy demand will be the opportunity for new energy generation sources. In this scenario, the use of hydrogen as an energy source has become an interesting alternative to energy production, as the use of fossil fuels can lead to harmful consequences, such as the emission of greenhouse gases. This paper presents the development of a low-cost instrumentation system for monitoring the temperature, current, voltage, and gas flow rate of a dry electrolytic cell. Through the electrolysis process, the cell generates a hydrogen-rich gas which is used as an additive in an internal combustion engine to reduce pollutant gas emissions and primary fuel consumption. The measured variables are presented as a function of the time to analyze the behavior of the electrolyzer. The main advance reported in this work is related to the use of a low-cost sensor for a hydrogen-rich gas flow measurement, in which calibration was performed indirectly using a rotameter as a reference. The calibration curve adjusted to the experimental data by linear regression presented a coefficient of determination of 0.9957. Thus, the use of the low-cost sensor is a feasible alternative for measuring the electrolysis gas generated by the cell.