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Speeding up combined cycle power plants

Physical Sciences, Energie und Umwelt

  • Participation in the electricity spot market
  • Reduced costs by reduced fatigue damage
  • Retrofit possible

Ihr Kontakt

Dr. Robert Phelps

+49 (0) 89 5480177 - 66


The integration of renewable power generation has not only lead to decreasing prices, but also the residual load, that has to be covered by conventional generation, becomes more variable. This is the reason why next to the costs of electricity generation, power plant flexibility gets more and more important. Combined cycle gas turbine power plants are very efficient but have too slow start up times to participate in the lucrative short term electricity spot market.


Ta novel buffer storage for the thermal decoupling of gas turbine (GT) and heat recovery steam generator (HRSG) during startups and shutdowns has been developed. The storage consists of a matrix of metal plates, placed in the flue gas channel between GT and HRSG, which is heated up during startup and cooled down during shutdown and therefore reduces the thermal gradients in the actual HRSG. The limitation to fast startups in combined cycle gas turbine (CCGT) plants is usually fatigue induced damage in critical components in the HRSG. A transient modeling strategy of both, storage and HRSG, finds, that in the investigated plant such a storage is capable of reducing the cycling fatigue damage in the most critical part of the HRSG by up to 90 % and therefore enables to act the GT as flexible as if no HRSG was connected to it

Kommerzielle Möglichkeiten

  • Gas and steam power plant are enabled to take part in the electricity spot market
  • Reduced cost by reduced fatigue damage by up to 90%
  • retro fit possible


Proof of concept and simulations


  • Reference:
    1. Anal. Chem. 87, 3134-3138 (2016)
    2. EP 3 134 725 A1; US 2017 0030860 A1
    3. Anal. Bioanal. Chem. 410, 6321-6330 (2018)

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