Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Parametrical and analytical analysis of biogas production and its use as an alternative fuel in a gas turbine cycle
Submission Author:
Gabriel Rabelo Thomaz , PR
Co-Authors:
Gabriel Rabelo Thomaz, Leonardo Cavalheiro Martinez, Nice Kaminari
Presenter: Gabriel Rabelo Thomaz
doi://10.26678/ABCM.ENCIT2022.CIT22-0374
Abstract
Due to a growing concern for the environment, it is increasingly sought out to replace traditional fossil fuels for ecological alternatives, trying to minimize possible environmental impacts in search of a more sustainable economy. That way, biogas has been shown as a less polluting way to generate energy, mainly in rural environments. That is why this article aimed to estimate the biogas production and apply it in a simple thermodynamical process. At first, a parametrical study on the biogas production was made, changing the feed origin (difference between cattle and pig slurry), the number of individual animals used, the time of hydraulic retention and the biodigester’s temperature. This first step showed that the increase of all the individual parameters resulted in a significant rise in the final volume of biogas produced. It is noted that, while utilizing data of a diverse catalog of similar studies, cattle slurry has shown more promising results, since a single ox can produce almost 10 times more cubic meters of biogas compared to a pig. Then, in a thermal analysis, the type of slurry, the numbers of animals, the fuel/air ratio and the biodigester operational temperature were varied to observe the difference of energy produced and the Thermodynamical System’s thermal efficiency. Like the biogas production, the cattle slurry showed more promising results, producing more energy; however, there was no difference between the thermal efficiency, which presented values around 41.13%. Despite the efficiency’s values, the system can be further optimized using a cogeneration process after the biofuel’s burn. The temperature’s alteration showed minimal results, its increment resulted in only a 0.6% increase in the efficiency. Lastly, the variation in the fuel/air ratio presented a curve in a parabolic shape. Despite the format of the resulting graphics, lower values of the fuel/air ratio were more favorable, presenting higher values of thermal efficiency and energy produced. In short, the biogas production, together with its use as an energy generator, can be a promising step in trying to minimize environmental impacts, reduce waste and, consequently, increase profit in a rural environment.
Keywords
Biogas, Biogas production, Thermodynamical analysis, Parametrical analysis
