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Performance of cryogenic oxygen production unit with exhaust gas bleed for sewage sludge gasification and different oxygen purities
Abstract
The paper presents a thermodynamic analysis of the integration of a cryogenic air separation unit into a negative CO2 emission gas power plant. The power cycle utilizes sewage sludge as fuel so this system fits into the innovative idea of bioenergy with carbon capture and storage. A cryogenic air separation unit integrated with the power plant was simulated in professional plant engineering and thermodynamic process analysis software. Two cases of the thermodynamic cycle have been studied, namely with the exhaust bleed for fuel treatment and without it. The results of calculations indicate that the net efficiencies of the negative CO2 emission gas power plant reach 27.05% (combustion in 95.0% pure oxygen) and 24.57% (combustion in 99.5% pure oxygen) with the bleed. The efficiencies of the cycle without the bleed are 29.26% and 27.0% for combustion in 95.0% pure oxygen and 99.5% pure oxygen, respectively. For the mentioned cycle, the calculated energy penalty of oxygen production was 0.235 MWh/kgO2 for the lower purity value. However, for higher purity namely 99.5%, the energy penalty of oxygen production for the thermodynamic cycle including the bleed and excluding the bleed was indicated 0.346 and 0.347 MWh/kgO2,respectively.
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- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.24425/ather.2023.147537
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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Archives of Thermodynamics
no. 44,
pages 63 - 81,
ISSN: 1231-0956 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Kaszuba M., Ziółkowski P., Mikielewicz D.: Performance of cryogenic oxygen production unit with exhaust gas bleed for sewage sludge gasification and different oxygen purities// Archives of Thermodynamics -Vol. 44,iss. 3 (2023), s.63-81
- DOI:
- Digital Object Identifier (open in new tab) 10.24425/ather.2023.147537
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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