Flexible operation of combined cycle gas turbine power plants with supplementary firing

Inés Encabo Cáceres, Rubén Mocholí Montañés, Lars Olof Nord


This article covers the use of supplementary firing in a gas-combined cycle power plant when high flexibility is required
depending on the penetration of variable renewable energies and under different gas turbine loads. Process models were
simulated under different operating conditions with the software EBSILONrProfessional. Five main conditions were studied
for the designed combined cycle: gas turbine part-load without supplementary firing, gas turbine full load with supplementary
firing, the use of supplementary firing to overcome the effect of changing ambient conditions, part-load gas turbine performance
with supplementary firing technology and the use of supplementary firing in case of gas turbine shutdown.


: CCGT; duct firing; off-design performance; process simulation; flexibility

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