Modelling of an integrated process for atmospheric carbon dioxide capture and methanation

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dc.contributor.authorTregambi, Claudio
dc.contributor.authorBareschino, Piero
dc.contributor.authorHanak, Dawid P.
dc.contributor.authorMontagnaro, Fabio
dc.contributor.authorPepe, Francesco
dc.contributor.authorMancusi, Erasmo
dc.date.accessioned2022-06-14T08:28:35Z
dc.date.available2022-06-14T08:28:35Z
dc.date.issued2022-04-29
dc.description.abstractNegative-emission technologies are largely investigated to better control atmospheric carbon dioxide concentration driving global warming. Calcium looping has been proposed in literature for direct air capture, but a comprehensive system analysis is still missing. Methanation of carbon dioxide can represent an alternative to geological storage, widely investigated within the power-to-gas framework. In this study, an integrated process considering the catalytic methanation of the concentrated carbon dioxide stream after capture from ambient air by a pure hydrogen stream from water electrolysis was proposed and numerically investigated. The system relies on packed bed reactors and uses calcium oxide as sorbent, and a nickel-based catalyst for methanation. A comprehensive study on the overall system performance was carried out, assuming a carbon dioxide capture target of 100 t y−1. Model computations suggest that roughly 50-in-parallel reactors, 0.5 m diameter each, are required for a continuous operation. The overall energy demand of the integrated process ranges within 344–370 GJ tCH4−1, or 215–293 GJ tCH4−1 if neglecting the humidifier. The methanation process requires 3-in-series reactors and can yield a continuous gas stream with a flow rate of 5 kg h−1 and a methane molar fraction of nearly 91%. If this stream is exploited for heat generation, a return of energy index of 16%, or 23% if neglecting the humidifier, is foreseen. The proposed process stems as viable solution towards a circular carbon economy.en_UK
dc.identifier.citationTregambi C, Bareschino P, Hanak D, et al., (2022) Modelling of an integrated process for atmospheric carbon dioxide capture and methanation. Journal of Cleaner Production, Volume 356, July 2022, Article number 131827en_UK
dc.identifier.issn0959-6526
dc.identifier.urihttps://doi.org/10.1016/j.jclepro.2022.131827
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/18019
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectCalcium loopingen_UK
dc.subjectCarbon capture and utilizationen_UK
dc.subjectDirect air captureen_UK
dc.subjectLimestoneen_UK
dc.subjectPower to gasen_UK
dc.subjectRenewable energyen_UK
dc.titleModelling of an integrated process for atmospheric carbon dioxide capture and methanationen_UK
dc.typeArticleen_UK

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