The oil and gas exploration and production sector are one of the most significant methane emitters through fossil fuel combustion and fugitive emissions. In Brazil, there are few studies focused on the mitigation of methane in the oil sector. The objective of the present work is to use a multicriteria analysis methodology to compare different methane mitigation technologies applicable to offshore oil and gas platforms. In the study, six different mitigation options were compared through the analytic hierarchy process methodology, considering environmental, financial and operational criteria. The results were calculated for each mitigation option considering the scores of each criterion and their respective relative weights, obtained in the prioritization of the elements. This unique score obtained through the analytic hierarchy process made it possible to compare the mitigation alternatives. The alternative that received the best score considering the evaluated criteria was the recovery of vapor from cargo tanks associated with methane reuse, being highlighted mainly due to its high potential for mitigation.
Pyrolysis is one of the most effective, economic and useful ways to produce bio-oil in the absence of oxygen. This article presents a study about the production of bio-oil from pyrolysis of waste potato peel and rice husk.This study aimed to evaluate the influence of the average particle size of the waste potato peel, and compare the results with another raw material, the rice husk. Three particles size were analyzed: (a) 0,500<Ø<1,400 mm, (b) 1,400<Ø<3,350 mm, and (c) Ø>3,350 mm. The best result with liquid (water and bio-oil) was 29.18% and it was obtained from the smaller particle size. The results obtained from potato peel and rice husk were compared for grain sizes (a) and (b). It was observed that the rice husk with the smaller size is more effective for bio-oil production (44.29% of liquid). However for the large particles sizes, the most effective raw material was the potato peel presenting a result of 27.74% of liquid
RESUMO: Neste trabalho, a casca de arroz, resíduo da agroindústria brasileira, foi caracterizada e transformada em bioóleo através do processo de pirólise rápida, utilizando um reator batelada. Foram avaliados os efeitos da temperatura e da granulometria da casca arroz no rendimento em produtos líquido, sólido e gasoso. As fases orgânica e aquosa do bio-óleo bruto foram separadas por extração e caracterizadas. Os resultados mostraram que a 130 ºC, o tempo de secagem de 90 min foi suficiente para remover a umidade da casca de arroz. A análise granulométrica mostrou que o tamanho predominante da casca de arroz está na faixa de 1,4 <Φ<3,3 mm. Foi observado que granulometrias menores aumentam o rendimento em líquido. O máximo rendimento em líquido (bio-óleo+água) foi de aproximadamente 40%, obtido na temperatura de 575 ºC. O bio-óleo bruto foi separado em frações aquosa (~17%) e orgânica (~83%) e, a acidez observada na fração aquosa sugere que a extração aumenta a alcalinidade do bio-óleo. PALAVRAS-CHAVE.
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