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2-3 Brayton recompression system 23 2-3-2 Turbine and compressors efficiency effect Figure 2-18 presents the TIT and the regenerators load as a function of the turbine and compressors adiabatic efficiencies. Though the system presents similar characteristics to the regenerative Brayton cycle shown in Figure 2-6, in this case the compressor efficiency plays a more important role because there are two compression processes in this configuration. 100 95 90 85 80 75 70 70 80 90 100 ηCM1, ηCM2 [%] 100 95 90 85 80 75 70 70 80 90 100 ηCM1, ηCM2 [%] (a) Contour lines of T4 (◦C). (b) Contour lines of Q ̇RG (MW). Figure 2-18: Turbine inlet temperature and total regenerators load for the Brayton recompression system as a function of the turbine and compressors efficiencies (ηTR = 50%, T2 = 31.25◦C, P2 = 74 bar, P3 = 300 bar, ηHR = 90%, ∆PLS = 2%, ∆TPN = 10◦C). 2-3-3 Pressure loss effect Figure 2-19a shows the TIT as a function of the pressure losses and the discharge pressure. 400 350 300 250 200 0 2 4 6 8 10 ∆PLS [%] 400 350 300 250 200 0 2 4 6 8 10 ∆PLS [%] (a) Contour lines of T4 (◦C). (b) Contour lines of Q ̇RG (MW). Figure 2-19: Turbine inlet temperature and total regenerators load for the Brayton recompression system as a function of the pressure loss and compressor discharge pressure (ηTR = 50%, T2 = 31.25◦C, P2 = 74 bar, ηTR = 93.4%, ηCM1 = 85%, ηCM2 = 85%, ηHR = 90%, ∆TPN = 10◦C). The trends are similar to those of the regenerative Brayton cycle presented in Figure 2-9, i.e., larger pressure losses require larger TIT and increasing the discharge pressure decreases Master of Science Thesis J.S. Bahamonde Noriega 800 700 800 80 800 900 1000 90 1100 900 90 100 80 110 60 70 1200 900 1000 1100 1000 60 70 90 100 80 110 50 60 70 120 100 860 840 820 800 50 60 60 70 60 780 800 70 80 820 840 860 P3 [bar] ηTR [%] P3 [bar] ηTR [%] 880 70 80 90 90 80 90 100 860 840 820 780 900 800 880 100 110 120 920PDF Image | Design method for s-CO2 gas turbine power plants
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