Hydrochar and synthetic natural gas co-production for a full circular economy implementation via hydrothermal carbonization and methanation: An economic approach

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González-Arias, JudithUniversidad de Sevilla,University of Seville (author)

Hydrochar and synthetic natural gas co-production for a full circular economy implementation via hydrothermal carbonization and methanation: An economic approach

Article/chapterEnglish2024

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2024

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LIBRIS-ID:oai:research.chalmers.se:b21afe64-4e4a-4855-97bd-a3bac2dcf8dc
https://doi.org/10.1016/j.jes.2023.04.019DOI
https://research.chalmers.se/publication/536072URI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype

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Herein we study the economic performance of hydrochar and synthetic natural gas co-production from olive tree pruning. The process entails a combination of hydrothermal carbonization and methanation. In a previous work, we evidenced that standalone hydrochar production via HTC results unprofitable. Hence, we propose a step forward on the process design by implementing a methanation, adding value to the gas effluent in an attempt to boost the overall process techno-economic aspects. Three different plant capacities were analyzed (312.5, 625 and 1250 kg/hr). The baseline scenarios showed that, under the current circumstances, our circular economy strategy in unprofitable. An analysis of the revenues shows that hydrochar selling price have a high impact on NPV and subsidies for renewable coal production could help to boost the profitability of the process. On the contrary, the analysis for natural gas prices reveals that prices 8 times higher than the current ones in Spain must be achieved to reach profitability. This seems unlikely even under the presence of a strong subsidy scheme. The costs analysis suggests that a remarkable electricity cost reduction or electricity consumption of the HTC stage could be a potential strategy to reach profitability scenarios. Furthermore, significant reduction of green hydrogen production costs is deemed instrumental to improve the economic performance of the process. These results show the formidable techno-economic challenge that our society faces in the path towards circular economy societies.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
SAMHÄLLSVETENSKAP Ekonomi och näringsliv Nationalekonomi hsv//swe
SOCIAL SCIENCES Economics and Business Economics hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
CO waste valorization 2
Hydrothermal carbonization
Methanation
Profitability analysis

Added entries (persons, corporate bodies, meetings, titles ...)

Torres-Sempere, GuillermoUniversidad de Sevilla,University of Seville (author)
González-Castaño, MiriamUniversidad de Sevilla,University of Seville (author)
Baena-Moreno, Francisco,1992Chalmers tekniska högskola,Chalmers University of Technology,Universidad de Sevilla,University of Seville(Swepub:cth)frabae (author)
Reina, T. R.Universidad de Sevilla,University of Seville (author)
Universidad de SevillaChalmers tekniska högskola (creator_code:org_t)

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In:Journal of Environmental Sciences140, s. 69-781001-07421878-7320

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Energy Engineeri ...

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