LAPSE:2024.0495
Published Article

LAPSE:2024.0495
Thermodynamically Efficient, Low-Emission Gas-to-Wire for Carbon Dioxide-Rich Natural Gas: Exhaust Gas Recycle and Rankine Cycle Intensifications
June 5, 2024
Onshore gas-to-wire is considered for 6.5 MMSm3/d of natural gas, with 44% mol carbon dioxide coming from offshore deep-water oil and gas fields. Base-case GTW-CONV is a conventional natural gas combined cycle, with a single-pressure Rankine cycle and 100% carbon dioxide emissions. The second variant, GTW-CCS, results from GTW-CONV with the addition of post-combustion aqueous monoethanolamine carbon capture, coupled to carbon dioxide dispatch to enhance oil recovery. Despite investment and power penalties, GTW-CCS generates both environmental and economic benefits due to carbon dioxide’s monetization for enhanced oil production. The third variant, GTW-CCS-EGR, adds two intensification layers over GTW-CCS, as follows: exhaust gas recycle and a triple-pressure Rankine cycle. Exhaust gas recycle is a beneficial intensification for carbon capture, bringing a 60% flue gas reduction (reduces column’s diameters) and a more than 100% increase in flue gas carbon dioxide content (increases driving force, reducing column’s height). GTW-CONV, GTW-CCS, and GTW-CCS-EGR were analyzed on techno-economic and environment−thermodynamic grounds. GTW-CCS-EGR’s thermodynamic analysis unveils 807 MW lost work (79.8%) in the combined cycle, followed by the post-combustion capture unit with 113 MW lost work (11.2%). GTW-CCS-EGR achieved a 35.34% thermodynamic efficiency, while GTW-CONV attained a 50.5% thermodynamic efficiency and 56% greater electricity exportation. Although carbon capture and storage imposes a 35.9% energy penalty, GTW-CCS-EGR reached a superior net value of 1816 MMUSD thanks to intensification and carbon dioxide monetization, avoiding 505.8 t/h of carbon emissions (emission factor 0.084 tCO2/MWh), while GTW-CONV entails 0.642 tCO2/MWh.
Record ID
Keywords
carbon dioxide monetization, CCS, exhaust gas recycle, gas-to-wire, multi-criteria analysis, Natural Gas, post-combustion carbon capture, Process Intensification, thermodynamic analysis
Subject
Suggested Citation
Poblete IBS, de Medeiros JL, Araújo ODQF. Thermodynamically Efficient, Low-Emission Gas-to-Wire for Carbon Dioxide-Rich Natural Gas: Exhaust Gas Recycle and Rankine Cycle Intensifications. (2024). LAPSE:2024.0495
Author Affiliations
Poblete IBS: Chemistry School, Centro de Tecnologia, E, Federal University of Rio de Janeiro, Ilha do Fundão, Rio de Janeiro 21941-909, RJ, Brazil [ORCID]
de Medeiros JL: Chemistry School, Centro de Tecnologia, E, Federal University of Rio de Janeiro, Ilha do Fundão, Rio de Janeiro 21941-909, RJ, Brazil [ORCID]
Araújo ODQF: Chemistry School, Centro de Tecnologia, E, Federal University of Rio de Janeiro, Ilha do Fundão, Rio de Janeiro 21941-909, RJ, Brazil [ORCID]
de Medeiros JL: Chemistry School, Centro de Tecnologia, E, Federal University of Rio de Janeiro, Ilha do Fundão, Rio de Janeiro 21941-909, RJ, Brazil [ORCID]
Araújo ODQF: Chemistry School, Centro de Tecnologia, E, Federal University of Rio de Janeiro, Ilha do Fundão, Rio de Janeiro 21941-909, RJ, Brazil [ORCID]
Journal Name
Processes
Volume
12
Issue
4
First Page
639
Year
2024
Publication Date
2024-03-22
ISSN
2227-9717
Version Comments
Original Submission
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PII: pr12040639, Publication Type: Journal Article
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LAPSE:2024.0495
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https://doi.org/10.3390/pr12040639
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Jun 5, 2024
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