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<p>Technology development, increase in population, and efficient power production in fossil power plants are important issues in the field of energy. In this regard, combined cycles based on gas turbine (GT) are very useful. In this article, energy, exergy, and exergoeconomic evaluations were performed using MATLAB for a combined cycle power plant. Furthermore, thermal simulation was implemented by THERMOFLEX commercial software. Single, dual, and triple pressure heat recovery steam generators were considered. A dynamic approach is modeled monthly for more accurate assessment. The maximum energy efficiency for single, dual, and triple pressure configurations was determined as 49.27%, 50.50%, and 49.33%, respectively. The highest power production was observed in January. The presence of a steam cycle can increase power production by up to 40.17%. Exhaust outlet temperature passes the dew point limit in three scenarios. The best exergy efficiency was calculated at 48.70% with dual pressure (DP) scenario, while the minimum value is 45.22% for triple pressure (TP) mode. In all scenarios, more than half of the total exergy destruction occurs in the combustion chamber due to the high input exergy and chemical reactions. Air compressor and GT have the best and weakest economic behavior based on relative cost differences, respectively. The minimum levelized cost of electricity is equal to 35.99 $ <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10973_2025_14134_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="57" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{MWh}}^{-1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mtext>MWh</mtext> </mrow> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </msup> </math></EquationSource> </InlineEquation> for the DP scenario, which is 0.96% and 3.17% less than the single pressure (SP) and TP scenarios, respectively. Therefore, the DP scenario is the best selection for HRSG configuration.</p> Graphical abstract <p></p>

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Energy, exergy, and exergoeconomic evaluations of a combined cycle with three configurations for heat recovery steam generator

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Behnam Samie,
  • Masoud Torabi Azad,
  • Gholamreza Salehi,
  • Kamran Lari

摘要

Technology development, increase in population, and efficient power production in fossil power plants are important issues in the field of energy. In this regard, combined cycles based on gas turbine (GT) are very useful. In this article, energy, exergy, and exergoeconomic evaluations were performed using MATLAB for a combined cycle power plant. Furthermore, thermal simulation was implemented by THERMOFLEX commercial software. Single, dual, and triple pressure heat recovery steam generators were considered. A dynamic approach is modeled monthly for more accurate assessment. The maximum energy efficiency for single, dual, and triple pressure configurations was determined as 49.27%, 50.50%, and 49.33%, respectively. The highest power production was observed in January. The presence of a steam cycle can increase power production by up to 40.17%. Exhaust outlet temperature passes the dew point limit in three scenarios. The best exergy efficiency was calculated at 48.70% with dual pressure (DP) scenario, while the minimum value is 45.22% for triple pressure (TP) mode. In all scenarios, more than half of the total exergy destruction occurs in the combustion chamber due to the high input exergy and chemical reactions. Air compressor and GT have the best and weakest economic behavior based on relative cost differences, respectively. The minimum levelized cost of electricity is equal to 35.99 $ \({\text{MWh}}^{-1}\) MWh - 1 for the DP scenario, which is 0.96% and 3.17% less than the single pressure (SP) and TP scenarios, respectively. Therefore, the DP scenario is the best selection for HRSG configuration.

Graphical abstract