Title: Thermo-economic assessment of upgrading a basic gas turbine power plant into CHP plant

Authors: Sofiane Aberkane; Hamza Semmari; Abdelkader Filali; Noura Rebai; Mustapha Belkadi

Addresses: Department of Mechanical Engineering, University Akli Mohand Oulhadj-Bouira, Rue Drissi Yahia Bouira-10000, Algeria; Laboratoire Energétique, Mécanique et Ingénieries (LEMI), University of M'Hamed Bougara Boumerdes, Boumerdes 35000, Algeria ' Laboratoire de Mécanique et Systèmes Énergétiques Avancés, Ecole Nationale Polytechnique de Constantine, BP 75, Nouvelle ville RP, Constantine, Algeria ' Laboratoire de Mécanique et Systèmes Énergétiques Avancés, Ecole Nationale Polytechnique de Constantine, BP 75, Nouvelle ville RP, Constantine, Algeria; Department of Chemical Engineering, Imperial College London, London, South Kensington, London, SW7 2AZ, UK ' Institut Algérien de Pétrole (IAP), Avenue 1er Novembre, Boumerdes, 35000, Algeria ' Département Développement, Innovation et Valorisation, Sonatrach, Direction Centrale Recherche et Développement, Avenue 1er Novembre, Boumerdes, 35000, Algeria

Abstract: This paper presents thermo-economic analyses of upgrading an existing Algerian gas turbine power plant into a CHP system. The proposed system includes a permanent upper steam Rankine cycle combined with a flexible ORC system during the summer period or a waste heat recovery exchanger during the winter period. The results revealed an increased energy efficiency by 16.9% and 21.59% for summer and winter configurations, respectively. Additionally, an increased exergy efficiency has been observed by 15.5% for both proposed configurations compared to the simple gas cycle with a positive environmental impact in terms of carbon footprint the reduction. The economic study highlights that the proposed solution is more attractive for international market rather than the local Algerian market that is characterised by a lower energy price.

Keywords: waste heat recovery; combined heat and power; organic Rankine cycle; economic analysis; Aspen HYSYS.

DOI: 10.1504/IJEX.2023.130368

International Journal of Exergy, 2023 Vol.40 No.4, pp.429 - 450

Received: 28 Apr 2022
Received in revised form: 09 Oct 2022
Accepted: 11 Oct 2022

Published online: 18 Apr 2023 *

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