Simulation of sCO2 pre-heating cycle as bottomer of commercial gas turbines up to 30 MW

Super critical carbon dioxide cycles have been gaining interest in the last decade for mid-size combined cycles, waste heat recovery, nuclear and even renewable power generation applications for several advantages in efficiency, size, economics, and environmental constraints. On this thesis work, simulations have been performed of Partial Heating sCO2 cycle as a bottomer of commercial gas turbines up to 30 MW. Results reported consider thermodynamics, efficiency, turbomachinery design, mass flow and economic indexes which allow considering sCO2 as a competitive alternative in mid-size combined cycles for power generation in industry sector or any distributed generation application. Turbomachinery design constraints in the compressor have been considered to avoid condensation with the AMC (Acceleration Margin to Condensation) criteria. Results reported reassert sCO2 cycles as a competitive alternative to ORC (Organic Rankine Cycles) for both combined cycles and waste heat recovery applications in the range of 445 to 575ºC in performance, size and economics perspective, besides environmental, operation and safety advantages.

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