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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12 Thermodynamic cycle analysis 600 550 500 450 400 350 300 250 200 20 25 30 35 40 T2 [◦C] 1150 600 550 500 450 400 350 300 250 200 20 25 30 35 40 T2 [◦C] (a) Contour lines of T4 (◦C). (b) Contour lines of Q ̇RG (MW). Figure 2-4: Turbine inlet temperature and regenerator load for the regenerative Brayton system as a function of the compressor suction temperature and compressor discharge pressure (ηTR = 50%, P2 =74bar,ηTR =93.4%,ηCM =85%,ηHR =90%,∆PLS =2%,∆TPN =10◦C). of the specific work of the compressor, which does not change significantly. Figure 2-5 is useful to understand the reasons behind this. This chart presents an example of the T-s diagram of the compression in the critical region. Notice that the isenthalpic lines are not horizontal but very steep and therefore decreasing the suction temperature with constant pressure ratio will decrease the temperature rise in the compressor, but not the specific work. On the other hand, the pressure ratio has an effect and increasing the discharge presure reduces the TIT since large pressure ratios increase the specific work of the cycle [47]. 120 100 80 60 40 20 0 1.2 1.3 1.4 1.5 1.6 s [kJ/kgK] Cycle Pressure Density Enthalpy 3 2 Figure 2-5: Compression T-s diagram (P2 = 74 bar, P3 = 300 bar, ηCM = 85%). Figure 2-4b shows the regenerator load . Although the suction pressure does not have a considerable effect in the regenerator power, larger discharge pressure do influence the results and decrease the power of the regenerator because larger pressure ratios decrease the temperature difference between the cold and hot sides of the regeneration process. Lower compressor suction temperatures do not considerably improve the performance of the cycle and additionally lower temperatures will bring the fluid to the liquid phase. This would involve supercritical condensation phenomena in the cooler, which should be preferable J.S. Bahamonde Noriega Master of Science Thesis 1050 950 900 40 900 50 40 50 1000 1050 60 950 70 1000 950 1000 60 1050 40 1050 1200 1250 80 90 100 1150 1100 60 70 90 1200 1100 80 90 100 50 70 80 100 T [◦C] P3 [bar] P3 [bar]

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