Technical Evaluation and Applications of Heat Recovery From Simple Cycle Gas Turbine Exhaust Systems

Bouria Faqihi, Fadi Ghaith

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


In the Gulf Cooperation Council region, approximately 70%of the thermal power plants are in a simple cycle configuration while only 30% are in combined cycle. This high simple to combined cycle ratio makes it of a particular interest for original equipment manufacturers to offer exhaust heat recovery upgrades to enhance the thermal efficiency of simple cycle power plants. This paper aims to evaluate the potential of incorporating costly-effective new developed heat recovery methods, rather than the complex products which are commonly available in the market, with relevant high cost such as heat recovery steam generators.In this work, the utilization of extracted heat was categorized into three implementation zones: use within the gas turbine flange-to-flange section, auxiliary systems and outside the gas turbine system in the power plant. A new methodology was established to enable qualitative and comparative analyses of the system performance of two heat extraction inventions according to the criteria of effectiveness, safety and risk and the pressure drop in the exhaust. Based on the conducted analyses,an integrated heat recovery system was proposed. The new system incorporates a circular duct heat exchanger to extract the heat from the exhaust stack and deliver the intermediary heat transfer fluid to a separate fuel gas exchanger. This systems howed superiority in improving the thermodynamic cycle efficiency, while mitigating safety risks and avoiding undesired exhaust system pressure drop.
Original languageEnglish
Title of host publicationASME 2020 Power Conference collocated with the 2020 International Conference on Nuclear Engineering
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791883747
Publication statusPublished - 13 Oct 2020
EventASME 2020 Power Conference - Anaheim, California, USA. However, due to COVID'19 travel restriction, it was changed to virtual conference, California, United States
Duration: 2 Aug 20206 Aug 2020
Conference number: 28


ConferenceASME 2020 Power Conference
Abbreviated titleICONE28-POWER2020
Country/TerritoryUnited States


  • Combined cycle
  • Exhaust system
  • Gas turbine
  • Simple cycle
  • Waste heat recovery

ASJC Scopus subject areas

  • Mechanical Engineering
  • Energy Engineering and Power Technology


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