Title: Exergy analysis of a natural gas combined cycle power plant: a case study

Authors: Gabriel Marques Pinto; Christian Jeremi Rodriguez Coronado; Túlio Augusto Zucareli De Souza; Eudes Müller D'Oliveira Santos

Addresses: Mechanical Engineering Institute – IEM, Federal University of Itajubá – UNIFEI, Av. BPS 1303, Itajubá, MG, CEP 37500-903, Brazil ' Mechanical Engineering Institute – IEM, Federal University of Itajubá – UNIFEI, Av. BPS 1303, Itajubá, MG, CEP 37500-903, Brazil ' Mechanical Engineering Institute – IEM, Federal University of Itajubá – UNIFEI, Av. BPS 1303, Itajubá, MG, CEP 37500-903, Brazil ' Mechanical Engineering Institute – IEM, Federal University of Itajubá – UNIFEI, Av. BPS 1303, Itajubá, MG, CEP 37500-903, Brazil

Abstract: This work performs energetic and exergetic analysis of a CCPP, by using a full-scope simulator, which faithfully reproduces the operation of a real Brazilian CCPP. The analyses are performed for design and off-design conditions. The results present, for the design condition, a generated power of 820.6 MW, a first law efficiency of 51.54% and a second law efficiency of 49.32%. The equipment responsible for the main irreversibilities were the combustion chamber (70.24%), gas turbine (10.75%) and heat recovery steam generator (7.37%). In the off-design scenario, the first and second law efficiencies were decreased by 2.65% and 2.54%, respectively.

Keywords: combined cycle; exergy; efficiency; exergy destruction rate.

DOI: 10.1504/IJEX.2022.120570

International Journal of Exergy, 2022 Vol.37 No.2, pp.159 - 180

Received: 30 Sep 2020
Accepted: 08 Apr 2021
Published online: 26 Jan 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article