&lt;b&gt;Analysis of lubricant oil contamination and degradation and wear of a biogas-fed otto cycle engine

Bertinatto, Rovian; Friedrich, Leandro; Bariccatti, Reinaldo Aparecido; Souza, Samuel Nelson Melegari de; Gurgacz, Flávio; Pazuch, Felix Augusto

doi:10.4025/actascitechnol.v39i4.29458

Cited by 6 publications

(6 citation statements)

References 9 publications

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“…Therefore, it is necessary to remove H 2 S from the biogas and/or to keep its content as low as possible. The most common methods of H 2 S removal include adsorption on activated carbon and the addition of air to biogas [29,30].…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Biomass of <i>Arundo donax</i> L. in the Context of Regional Bioenergetics

Giertl¹,

Pauková²,

Hauptvogl³

et al. 2022

Pol. J. Environ. Stud.

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In Slovakia, maize silage is preferred as the input material for biogas production whereas it should be used primarily as feed for cattle. The purpose of this paper is to point out the possibilities of using the fast-growing giant reed Arundo donax L. that is not used as fodder and can be grown on low-quality agricultural land. The experimental stand of A. donax L. used in the study provided a yield of 60.8 t ha -1 of fresh biomass in the third year of cultivation. Part of the biomass produced was ensiled as maize and later the silage was co-fermented with cattle excrements and pig slurry. The resulting biogas can be used as fuel for internal combustion engines. The average content of CH 4 and CO 2 is 52% and 44%, respectively. These values are very similar to the composition of maize silage biogas. The average hydrogen sulphide content in the biogas from A. donax L. was 730 ppm. The disadvantage is that the biogas production is 46% lower compared to maize silage.

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Section: Resultsmentioning

confidence: 99%

Evaluation of the Biomass of <i>Arundo donax</i> L. in the Context of Regional Bioenergetics

Giertl¹,

Pauková²,

Hauptvogl³

et al. 2022

Pol. J. Environ. Stud.

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“…The lubricating oil total acid number (TAN) and flash point remained relatively stable across the 5+ years, it can thus be concluded that shearing due to the consistent high temperature operation of the lube oil is most likely responsible for the depletion of oil additives such as Zinc and Magnesium additives which dropped by 23.9% and 26% respectively after 47,520 equivalent operating hours (EOH) leading to the decay in the viscosity. The Magnesium elemental additive decreased by more than the 25% limit earmarked by ASTM D4378 and D5185` [38] for precautionary action to be undertaken ,while both additives depreciated by more than the 20% of new oil concentration for Zinc, Calcium and phosphorus suggested by Ngele et al, (2013) as reported by [39]. The conclusion that shearing is responsible for the decay in viscosity is based on the parameter trends and indicators which conform with assertions made by [40][41][42][43].…”

Section: Discussionmentioning

confidence: 99%

Gas Turbine Bearing Temperature Monitoring via Regression Modelling

Mohammed

Ozigis²,

Lawal

2023

AJERD

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This paper focuses on using Regression technique (MLR) towards finding solution to incidence of high compressor bearing temperature on one of the units at Geregu power plant in Ajaokuta, Nigeria. Monitoring of parameters related to the bearing temperature was carried out to find out causes for the high bearing temperature fault and came up with successful diagnosis by interrelating the gasturbine current lube oil test results of parameters like the kinematic viscosities, % concentration of additives and flash point with reference and standard VG46 lube oil data published in literature. Using statistical tools like the Pearson correlation and co-variant metrics for the five-years, the viscosities at 100oC and 40oC were selected as the input of the MLR model based on their Pearson coefficients of (-98.08%) and (-99.68%) respectively relative to the compressor bearing temperature and the covariance strength of the two parameters independently. The MLR model for the bearing temperature prediction gave a root mean square error of 0.121 and coefficient of determination(R2) of 99.71%. The model predicts that by the 2nd quarter of 2025, the bearing temperature would have reached the alarm point(900C) from the current value of 850C and that by the 1st quarter of 2027, the bearing temperature would have reached the trip point (1200C). Conclusion reached is that a well formulated data driven model can reliably forecast bearing temperature and together with sensors aid in gasturbine condition monitoring. Likewise, it is concluded that shearing due to the consistent high temperature operation of the gasturbine lube oil is responsible for the depletion of the Zinc(-23.9%) and Magnesium(-26%) additives leading to the decay in the viscosity and consequent bearing temperature increment. Recommendation made is to either replenish oil with antiwear additives or completely replace the oil to minimize the bearing wear rate and thus the bearing temperature.

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“…P a g e | 207 Revista Ibero-Americana de Ciências Ambientais v.10 -n.2  Fev a Mar 2019 periódico. Esse movimento é transformado em movimento rotativo e ligado ao eixo do gerador (BERTINATTO et al, 2017).…”

Section: Sistemas De Aproveitamento Elétricounclassified

Processo de produção e aproveitamento energético do biogás: uma revisão dos sistemas e tecnologias existentes no mercado

Silva

Trevisan

2019

RICA

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As fontes de energia renováveis contribuem para a melhoria do quadro socioambiental do planeta, ao passo que essas energias possuem um nível de poluição reduzido se comparadas com as fontes de energia fósseis. O biogás, produzido a partir da digestão anaeróbia da matéria orgânica presente em resíduos agropecuários e agroindustriais, representa uma fonte alternativa e renovável de energia cada vez mais utilizada em todo o mundo, havendo um potencial significativo de produção de biogás através destas biomassas. Assim, no presente artigo foi realizada uma revisão de literatura, desenvolvida por meio de legislação, livros e periódicos nacionais e internacionais, visando um detalhamento dos sistemas e técnicas de produção e aproveitamento energético do biogás disponíveis no mercado, desde o momento do pré-tratamento do resíduo até a sua conversão em energia. Diante desse estudo, pode-se observar que o biogás apresenta como alternativa energética no conjunto das renováveis, onde os benefícios gerados pelo aproveitamento, além de econômico, são sociais e ambientais, atendendo, desta maneira, as necessidades de tratamento dos resíduos de diversas origens, criando uma relação positiva entre desenvolvimento econômico e ambiental. Contudo, projetos para a geração de energia por meio do biogás demandam custos de implantação, operação e manutenção, mas ao todo demonstram que o processo de viabilidade do aproveitamento energético depende, substancialmente, da escala dos mesmos, para se tornarem autossustentável. Assim, esses resultados apenas pressupõem uma situação que poderá ser melhor avaliada com base em frequentes estudos, para aprimorar os processos, uma vez que cada situação em particular, é influenciada por características locais próprias.

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<b>Analysis of lubricant oil contamination and degradation and wear of a biogas-fed otto cycle engine

Cited by 6 publications

References 9 publications

Evaluation of the Biomass of <i>Arundo donax</i> L. in the Context of Regional Bioenergetics

Evaluation of the Biomass of <i>Arundo donax</i> L. in the Context of Regional Bioenergetics

Gas Turbine Bearing Temperature Monitoring via Regression Modelling

Processo de produção e aproveitamento energético do biogás: uma revisão dos sistemas e tecnologias existentes no mercado

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