Effect of the ambient conditions on gas turbine combined cycle power plants with post-combustion CO2 capture

Abigail González-Díaz, Agustín M. Alcaráz-Calderón, Maria Ortencia González-Díaz, Ángel Méndez-Aranda, Mathieu Lucquiaud and Jose Miguel González-Santaló

Energy, 2017, vol. 134, issue C, 221-233

Abstract: This paper evaluates the effect of ambient conditions on a natural gas combined cycle power plant (NGCC) with CO2 capture and proposes design options for effective integration and off-design operation. In particular, the study assesses the effect of ambient temperature in the context of the electricity system in Mexico and proposes supplementary firing in the heat recovery steam generator to mitigate reduction in power output. For ambient temperature varying from −5 °C to 45 °C, a typical temperature variation in the north of Mexico, the efficiency of the NGCC with CO2 capture reduces from 50.95% to 48.01% when the temperature increased from 15 °C (ISO design condition) to 45 °C, and reduces from 50.95% to 50.78% when the temperature decreased from 15 °C to −5 °C. The power generated decreases from 676.3 MW at 15 °C to 530 MW at 45 °C. In order to compensate for the loss of output caused by seasonal changes in ambient temperature, supplementary firing in the heat recovery steam generator can be used to generate additional power and return the power output to 640 MW at 45 °C, at the expense of an increase in fuel costs and a drop in efficiency from 50.95% to 43.46%, without and with supplementary firing respectively.

Keywords: Ambient temperature; CO2 capture; Natural gas combined cycle; Supplementary firing (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:134:y:2017:i:c:p:221-233

DOI: 10.1016/j.energy.2017.05.020

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