Design method for s-CO2 gas turbine power plants

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Design method for s-CO2 gas turbine power plants ( design-method-s-co2-gas-turbine-power-plants )

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2-2 Regenerative Brayton system 17 heat exchanger has been assumed for this analysis. While both streams show an ideal gas behavior in the hot region of the heat exchanger, the cold extreme is close to the critical point, showing real gas effects. In this region, the slope of the heat capacities is not constant. As 700 600 500 400 300 200 100 0 0 10 20 30 40 ∆ Q ̇ R G [ M W ] Hot stream Cold stream 5 3.5 6 3 Figure 2-12: Regeneration temperature profile for the regenerative Brayton system (ηTR = 50%, T2 =31.25◦C,P2 =74bar,P3 =520.28bar,ηTR =93.4%,ηCM =85%,ηHR =90%,∆PLS =2%, ∆TPN = 10◦C). a consequence the effectiveness of the heat exchanger decreases. Besides, the pinch point is not necessarily located at one of the extremes of the heat exchanger. Thus, the temperature difference is checked over the entire heat exchanger. The operating characteristics of the power system are presented in Table 2-3. Table 2-3: Operating conditions for the regenerative Brayton system (ηTR = 50%, T2 = 31.25◦C, P2 =74bar,P3 =520.28bar,ηTR =93.4%,ηCM =85%,ηHR =90%,∆PLS =2%,∆TPN =10◦C) Variable Required CO2 mass flow Regenerator effectiveness Regenerator power Heater power Cooler power Compressor power Turbine gross power Value kg/s 65.22 % 97.89 MW 37.47 MW 33.67 MW 14.97 MW 5.71 MW 24.42 Notice that the regenerator power is the largest among the components. Feher [1] already mentioned this characteristic as an advantage of the s-CO2 power cycles since it allows to recuperate large quantities of energy in the regeneration process. Similarly, the power of the compressor is 20% the power of the turbine, while in the typical Brayton systems the compressor power reaches values up to 50% the turbine gross power. This is another advantage of the s-CO2 that allows high efficiencies at moderate TITs. Exergy analysis The exergy of an energy system is defined as the maximum work that can be produced by the combination of the system and a specified reference environment [50]. Exergy analysis of power plants is used to quantify the thermodynamic losses that cause exergy destruction, i.e., Master of Science Thesis J.S. Bahamonde Noriega T [◦C]

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