bancada de resistências. A análise realizada contempla a potência elétrica gerada pelo equipamento, o consumo específico, a eficiência, o fator λ e as emissões de CO e de O 2 . Os resultados mostraram que é possível obter energia elétrica, através de biogás como combustível, mas com baixa eficiência. Os resultados de O 2 e de λ indicam que uma combustão é realizada com excesso de ar para todas as configurações. No que se refere às emissões de CO, para o biogás, foram inferiores a 900 ppm, enquanto que, para a gasolina, as emissões de CO ficaram ao redor de 17.400 ppm, para a taxa de compressão de 10,2:1 e de 70.500 ppm, para a taxa de compressão de 8,2:1. Palavras-chave:Motor Otto. Biogás. Emissões. AbstractThis study has analyzed the performance of a generator set equipped with an Otto-cycle engine, operating with biogas, and compared to the same system, operating with gasoline. The tests were performed in a Branco (brand name) generator, model B4T-5000 BIO, with load capacity change through a resistance bench. The performed analysis comprises the electric power generated by the equipment, the specific consumption, the efficiency, the λ factor and the CO and O 2 emissions. The results showed that it is possible to obtain electric power with biogas as fuel, but with low efficiency. The results of O 2 and λ indicate that the combustion is performed with excess air to all configurations. Concerning to the CO emissions for the biogas, they were lower than 900 ppm, whereas, for the gasoline, the CO emissions were around 17,400 ppm for the compression rate of 10,2:1 and 70,500 ppm for the compression rate of 8,2:1.
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