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Integration of oxygen-containing exhaust gas into the air separation unit of an oxyfuel power plant
Citation Link: https://doi.org/10.15480/882.2091
Publikationstyp
Conference Paper
Publikationsdatum
2014-08-28
Sprache
English
Author
Institut
TORE-URI
Enthalten in
Volume
51
Start Page
99
End Page
108
Citation
Energy Procedia (51): 99-108 (2014)
Contribution to Conference
Publisher DOI
Scopus ID
The Oxyfuel process is one possible solution to lower the high specific CO2 emissions of coal-fired power plants. The flue gas generated by this process has a high CO2 content, due to the missing nitrogen. However the dried flue gas still contains approximately 15 vol% (dry) impurities (NOx, SOx, O2, N2 and Ar). To further increase the CO2 purity the flue gas needs to be treated in a gas processing unit (GPU). Additional downstream gas treatment approaches such as Polymeric Membranes or Pressure Swing Adsorption to capture CO2 from the offgas of the GPU, can raise the capture rate from 90% to 99%. The remaining CO2 and most of the impurities contained in the offgas downstream of the GPU are discharged to the environment with the exhaust gas of the GPU. The O2 contained in the exhaust gas downstream of the GPU amounts to 4-5% of the oxygen supplied by the ASU. The energy demand of the ASU can be lowered if the O2 contained in this exhaust gas was captured and recycled back to the firing system. The energy saving potential of such a recycle would amount to 4-5% of the ASU energy demand, but only if all O 2 is captured from the exhaust gas and no energy is needed for the capturing process. So the capturing process and its integration into the overall process has a substantial influence on the achievable energy saving. Target of this work is to integrate and model the capture and recycle of the oxygen from the exhaust gas back into the Oxyfuel power plant process. © 2013 Published by Elsevier Ltd.
Schlagworte
Co2 capture
oxyfuel
optimization
DDC Class
600: Technik
620: Ingenieurwissenschaften
More Funding Information
Bundesministerium für Wirtschaft und Technologie
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