Analysis of lubricant oil contamination and degradation and wear of a biogas-fed otto cycle engine/Analise da contaminacao e degradacao do oleo lubrificante e desgaste de um motor ottolizado alimentado por biogas

• Published in: Acta scientiarum. Technology 2017-10, Vol.39 (4), p.409
• Main Authors: Be, Friedrich, Leandro, Bariccatti, Reinaldo Aparecido, de Souza, Samuel Nelson Melegari, Gurgacz, Flavio, Pazuch, Felix Augusto
• Format: Article
• Language: Spanish
• ISSN: 1806-2563
• DOI: 10.4025/actascitechnol.v39i4.29458

The increasing deployment of biodigesters for the treatment of waste on farms and the use of the biogas generated in the production of energy have highlighted the need for knowing the influence of this fuel on internal combustion engines. This study aimed to analyze the influence of filtrated biogas on lubricant oil contamination and degradation, as well as on engine wear and corrosion. Lubricant oil samples were collected every 75 engine operating hours (EOH) and then correlated between each other and with a sample of new oil, determining the elements present in the biogas that contribute to lubricant oil contamination and degradation, as well as lubricant oil performance in the course of EOH and engine wear. The results demonstrate that hydrogen sulfide affects the performance of the lubricant oil and engine wear. Among the metals, we observed that the copper concentration exceeded the maximum limit recommended in the literature. As for the additives, the variation in concentrations of magnesium impacted on lubricant performance. By monitoring lubricant oil quality were able to extend the engine oil change interval of this study by 50%, what resulted in a savings of 33.3% in the cost of lubricant per hour worked. Keywords: contaminants, biogas, biodigester, biomethane, corrosion. A crescente implantacao de biodigestores para tratamento de residuos nas propriedades rurais e a utilizacao do biogas gerado na producao de energia mecanica evidenciaram a necessidade de conhecimento da influencia de utilizacao deste combustivel nos motores de combustao interna. Este trabalho teve como objetivo analisar a influencia da utilizacao do biogas filtrado na contaminacao e degradacao do oleo lubrificante, desgaste e corrosao do motor. Amostras de oleo lubrificante foram coletadas a cada 75 hM (horas de funcionamento do motor), e apos correlacionadas dentre elas e com uma amostra de oleo novo, determinando os elementos presentes no biogas que contribuem para a contaminacao e degradacao do oleo lubrificante, como tambem o desempenho do lubrificante no decorrer das hM e o desgaste do motor. Os resultados demostraram que o gas sulfidrico influencia no desempenho do oleo lubrificante e no desgaste do motor. Dentre os metais, foi identificado que a concentracao de cobre excedeu o maximo recomendado pela literatura, e a elevacao da sua concentracao teve relacao com a elevacao de chumbo e estanho, principalmente apos as 375 hM. Em relacao aos aditivos, foi a variacao das conce