Natural gas combined cycle with exhaust gas recirculation and CO2 capture at part-load operation.
In: Journal of the Energy Institute (Elsevier Science), Jg. 92 (2019-04-01), Heft 2, S. 370-381
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Zugriff:
Abstract This paper aims to evaluate part-load operation of a natural gas combined cycle (NGCC) power plant with exhaust gas recirculation (EGR) and a CO 2 capture plant. Several studies have demonstrated the feasibility and the advantages of EGR at full load, but operation at part load is also important because it is a common condition when NGCC power plants are being used as backup for renewables. The results of this study show that the number of absorber trains is reduced from 4 to 3 with EGR. The efficiency of the NGCC plant with EGR was 0.5% points higher than a conventional NGCC at full load as a result of a higher CO 2 concentration in the flue gas. However, this efficiency advantage decreased as the load was reduced from 100% to 50%, with both cases presenting the same efficiency at 50% load. This means that there was no benefit from the effect of EGR at lower loads. The efficiency of a NGCC plant with EGR and CO 2 capture configuration decreased from 52.6% to 45.9% when the load was reduced from 100% to 50% compared with a conventional NGCC where the efficiency changed from 52.1% to 45.9%. It was concluded that a NGCC plant with EGR and CO 2 capture is viable, results in lower capital costs due to the smaller number of absorber trains and yields slightly higher efficiencies, for operation at part-load down to 50%. Highlights • Exhaust gas recirculation with CO 2 capture at part-load. • Future electricity market will include renewable energy which will make power plants operate at off-design. • Any novel alternative with carbon capture should not impose a constraint to this need for flexibility. • EGR would still have a positive influence on the capture plant at part load. • Percentage of Exhaust gas recirculation at part-load. [ABSTRACT FROM AUTHOR]
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Titel: |
Natural gas combined cycle with exhaust gas recirculation and CO2 capture at part-load operation.
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Autor/in / Beteiligte Person: | Alcaráz-Calderon, Agustín Moisés ; González-Díaz, Maria Ortencia ; Mendez, Ángel ; González-Santaló, Jose Miguel ; González-Díaz, Abigail |
Zeitschrift: | Journal of the Energy Institute (Elsevier Science), Jg. 92 (2019-04-01), Heft 2, S. 370-381 |
Veröffentlichung: | 2019 |
Medientyp: | academicJournal |
ISSN: | 1743-9671 (print) |
DOI: | 10.1016/j.joei.2017.12.007 |
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