Energy production and effect of ecological efficiency on the electricity production cost of a combined cycle without/with supplementary fuel burning. (1st February 2023)

• Record Type: Journal Article
• Authors: Mariños Rosado, Diego J.; Mendiburu, Andrés Z.; de Carvalho, João A.
• Is Part Of: Thermal science and engineering progress. Volume 38(2023)
• Publication Date: 2023-02-01
• Subjects: Combined cycle -- Ecological efficiency -- Electricity production cost -- Supplementary fuel burning -- Thermoelectric power plant; Heat engineering -- Periodicals; Heat engineering; Thermodynamics; Periodicals; 621.402
• DOI: 10.1016/j.tsep.2022.101623
• Languages: English
• ISSNs: 2451-9049

Abstract

Highlights: Thermoelectric power plant without/with supplementary fuel burning was evaluated. Exergetic efficiency and irreversibility were estimated in the combined cycle. Global efficiency values of 50.81% and 47.39% were obtained for each case. Ecological efficiency values of 93.2% and 89.9% were obtained for each case. Electricity production cost increased from 10% to 12% in the case with supplementary fuel burning. Abstract: The present article a natural gas combined cycle thermoelectric power plant, without/with supplementary fuel burning (SFB), was evaluated through an energetic, exergetic, environmental and economic analysis. The objective of this research is to show that the lower energy production related to the system without SFB is compensated by the higher environmental efficiency. The evaluations were carried out to determine the global efficiency and the energy benefits/losses from the different equipment. The environmental analysis determined all emissions, pollution indicator (Πg), and ecological efficiency ( ε ) considering the international air quality standards. Finally, the economic analysis determined the expected annual benefit due to the pay-back and the electricity production cost (PCEE), incorporating the effects of the environmental impacts. When developing the present study, the system without/with SFB evidenced a global efficiency of 50.81 % vs 47.39 %, respectively. In addition, the system without SFB showed better results of exergetic efficiency and irreversibility, its Πg and ε were 0.056 kg/MJ and 93.2 %. While its total emissions were 16 % lower. The economic analysis verified the annual benefit due to the pay-back for an annual interest rate of 4 %, 8 % and 12 %, and the PCEE showed an increase between 10 % and 12 % in the case with SFB.