Since the Kyoto conference, there is a broad consensus that the human emission of greenhouse gases, mainly , has to be reduced. In the power generation sector, there are three main alternatives that are currently studied worldwide. Among them oxy-fuel cycles with internal combustion with pure oxygen are a very promising technology. Within the European project ENCAP (enhanced CO2 capture) the benchmarking of a number of novel power cycles with capture was carried out. Within the category oxy-fuel cycles, the Graz Cycle and the semiclosed oxy-fuel combustion combined cycle (SCOC-CC) both achieved a net efficiency of nearly 50%. In a second step, a qualitative comparison of the critical components was performed according to their technical maturity. In contrast to the Graz Cycle, the study authors claimed that no major technical barriers would exist for the SCOC-CC. In this work, the ENCAP study is repeated for the SCOC-CC and for a modified Graz Cycle variant as presented at the ASME IGTI Conference 2006. Both oxy-fuel cycles are thermodynamically investigated based on common assumptions agreed upon with the industry in previous work. The calculations showed that the high-temperature turbine of the SCOC-CC plant needs a much higher cooling flow supply due to the less favorable properties of the working fluid. A layout of the main components of both cycles is further presented, which shows that both cycles rely on the new designs of the high-temperature turbine and the compressors. The SCOC-CC compressor needs more stages due to a lower rotational speed but has a more favorable operating temperature. In general, all turbomachines of both cycles show similar technical challenges and are regarded as feasible.
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Qualitative and Quantitative Comparison of Two Promising Oxy-Fuel Power Cycles for Capture
Wolfgang Sanz,
Wolfgang Sanz
Institute for Thermal Turbomachinery and Machine Dynamics,
e-mail: wolfgang.sanz@tugraz.at
Graz University of Technology
, Graz 8010, Austria
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Herbert Jericha,
Herbert Jericha
Institute for Thermal Turbomachinery and Machine Dynamics,
Graz University of Technology
, Graz 8010, Austria
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Bernhard Bauer,
Bernhard Bauer
Institute for Thermal Turbomachinery and Machine Dynamics,
Graz University of Technology
, Graz 8010, Austria
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Emil Göttlich
Emil Göttlich
Institute for Thermal Turbomachinery and Machine Dynamics,
Graz University of Technology
, Graz 8010, Austria
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Wolfgang Sanz
Institute for Thermal Turbomachinery and Machine Dynamics,
Graz University of Technology
, Graz 8010, Austriae-mail: wolfgang.sanz@tugraz.at
Herbert Jericha
Institute for Thermal Turbomachinery and Machine Dynamics,
Graz University of Technology
, Graz 8010, Austria
Bernhard Bauer
Institute for Thermal Turbomachinery and Machine Dynamics,
Graz University of Technology
, Graz 8010, Austria
Emil Göttlich
Institute for Thermal Turbomachinery and Machine Dynamics,
Graz University of Technology
, Graz 8010, AustriaJ. Eng. Gas Turbines Power. May 2008, 130(3): 031702 (11 pages)
Published Online: April 2, 2008
Article history
Received:
May 24, 2007
Revised:
May 25, 2007
Published:
April 2, 2008
Citation
Sanz, W., Jericha, H., Bauer, B., and Göttlich, E. (April 2, 2008). "Qualitative and Quantitative Comparison of Two Promising Oxy-Fuel Power Cycles for Capture." ASME. J. Eng. Gas Turbines Power. May 2008; 130(3): 031702. https://doi.org/10.1115/1.2800350
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