Landfill-gas oxy-combustion via novel air separation unit: Upgraded exergy performance

George Victor Brigagão, José Luiz de Medeiros and Ofélia de Queiroz F. Araújo

Renewable and Sustainable Energy Reviews, 2025, vol. 211, issue C

Abstract: Landfill-gas-to-wire power generation with carbon capture and sequestration is a net negative emission concept, which can help regions to reach theirs net zero targets, while contributing with following United Nations sustainable development goals: climate action; affordable and clean energy; industry, innovation and infrastructure. Oxy-combustion is a plausible capture route to avoid drawbacks of CO2 removal from exhaust-gas, in exchange to the operation of an exclusive air separation unit for oxygen supply, which is usually a bottleneck for the overall performance of the route. In this work, unprecedented exergy analysis of oxyfuel-landfill-gas-to-wire is performed with support of process simulation in Aspen HYSYS, considering four different cryogenic air separation units: two of them use conventional double-column or triple-column nitrogen-oxygen separations, while the other two are single-column vapor-recompression distillations. One of the latter is a novel scheme and reached the lowest separation power demand and lowest exergy destruction for oxygen production, thus being evinced as the best air separation unit for oxyfuel-landfill-gas-to-wire. Its greater performance is explained by lower fractionation and compressor exergy destructions: respectively 78 % and 42 % relatively to double-column counterparts. Oxyfuel-landfill-gas-to-wire process is then evaluated and compared with the conventional carbon-emitting landfill-gas-to-wire for different gas-turbine pressure-ratios. The main disadvantage of lower gas-turbine pressure-ratios is the higher Rankine-cycle exergy destruction that follows hot-gas temperature increase. In all cases, combustion is the major source of exergy loss, while the proposed air separation unit contributes with only 6.15 % of total exergy destruction of oxyfuel-landfill-gas-to-wire for combustion at 19.5 bar.

Keywords: Exergy analysis; Air separation; Landfill-gas; Oxy-combustion; Bioenergy; Power generation; Carbon capture and storage (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.rser.2024.115309

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