Many countries have adopted the addition of biodiesel to diesel as a way of inserting renewable content into mineral fuel and making a contribution to the environment. The addition of ethanol to the diesel/biodiesel blend to increase the renewable content of the added fuel blend and reduce the percentage of biodiesel could be a strategysince the demand for biodiesel production is high, and this fuel has a high production cost when compared to ethanol. Thus, this study evaluated the performance and the content of NOx, CO and CO2 exhaust gases from a diesel engine fueled with blends of diesel/biodiesel/ethanol: pure B7, B7E3 (B7 with 3% ethanol) and B7E10 (B7 with 10% ethanol). Emissions of fuel blends were evaluated using the engine speed variation and tested at a speed of 1500 rpm under constant load (185 Nm). Assays were performed at engine speeds of 1000, 1100, 1250, 1500 and 1750 rpm and with loads of 10, 25, 50, 75 and 100% of the maximum torque. Through the performance curves, the specific consumption and thermal efficiency were evaluated. The increase in speed and ethanol content in the diesel/biodiesel mixture increased approximately 5 to 7 and 1.4 times, respectively, in terms of the emission of exhaust gases. There was a 6% decrease in the maximum torque and power available at each speed with increasing ethanol content in the blend. However, in a vehicular application, this decrease would be perceived only at some points of the part-load regime, causing considerable reductions in thermal efficiency.
A necessidade em adequar os processos produtivos aos novos paradigmas da economia circular, transformando os resíduos em insumos produtivos, representa um grande desafio. A produção de fontes alternativas de energia a partir de matéria-prima residual representa uma significativa contribuição dentro do conceito da economia circular. Desta forma, este trabalho utiliza a dinâmica de sistemas para o desenvolvimento de um modelo de simulação, analisando a integração do óleo residual na cadeia de produção e uso do biodiesel. O modelo analisado utilizou o software Vensim, avaliando três cenários em um período de 10 anos, verificando as possíveis mitigações de impacto em decorrência da correta destinação do óleo residual por meio da produção de biodiesel. Os resultados obtidos com a simulação dos cenários mostram que o cenário sustentável representa uma redução dos impactos ambientais que acontecem em função do descarte deste resíduo, redução nas emissões de CO2 e aumento na produção de biodiesel.
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