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The 4th International Symposium – Supercritical CO2 Power Cycles September 9-10, 2014, Pittsburg, Pennsylvania Table 1: Temperature and pressure state points for the S CO2 Brayton cycle and the ICE-Rankine cycle. The fluid type and mass flow rate are also provided. SCO2 POWER CYCLES BRAYTON Temperature (K) 304.5 328.4 350.1 374.9 374.9 445.6 614.3 761.2 644.3 482.0 389.4 338.4 811.15 644.31 581.7 581.7 292.15 308.38 Pressure (kPa) 7500 15927 15795 23400 23400 23205 23012 22820 7691 7691 7627 7563 101.00 101.00 101.00 101.00 420.00 320.00 Fluid Type CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CG CG CG CG H2O H2O Mass Flow Rate (kg/s) 70.2 70.2 70.2 70.2 13.36 56.88 70.2 70.2 70.2 70.2 70.2 70.2 69.8 69.8 69.8 69.8 169.66 169.66 ICE-RANKINE Temperautre (K) 278.0 289.6 350.1 374.9 374.9 467.1 554.9 761.2 584.9 529.2 450.3 299.6 811.2 584.9 462.2 462.2 273.15 273.15 Pressure (kPa) 3954 15927 15795 23400 23205 23205 23012 22820 4055 4055 4021 3987 101.0 101.0 101.0 101.0 101.0 101.0 Fluid Type CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CO2 CG CG CG CG ICE ICE Mass Flow Rate (kg/s) 67.5 67.5 67.5 67.5 33.12 34.34 67.5 67.5 67.5 67.5 67.5 67.5 69.8 69.8 69.8 69.8 - - Table 2: Table of power and heat transfer values for the ICE-Rankine Power system and the SCO2 Brayton power system. Both power system use a recuperated power cycle with compressor inter-recuperation (CIR). Also, both power cycles split some of the compressor exit high pressure flow through a CO2 preheater without recuperation. Description Name Unit ICE Rankine Brayton Preheater HX Therm Pwr Primary HX Therm Pwr Total CO2 Hx Therm Pwr LT Recup Therm Pwr HT Recup Integ Recup Comp Inter-Recuperation Total Recup Main Comp Pwr Comp Pwr A Comp Pwr B ReComp Pwr Power Ratio.cycle Q.PreHX kW Q.PrimHX kW Q . Prim + Pre Hx kW Q LT Recup kW Q.HT.Recup kW Q.Integ Recup kW Q.CIR kW Q.recup.total kW P.Comp kW P.Comp. A kW P.Comp.B kW P.ReComp kW 9418.6 17372.5 26791.1 5670.9 4096.7 9767.6 11295.8 21063.43 2329.1 1100.1 1228.9 0.0 162.2% 4804.6 12810.1 17614.8 7542.0 12909.5 20451.5 4931.7 25383.18 2430.9 1151.3 1279.6 0.0 Power Losses Aux Power (water pump, purge gas, fans, elec kW 68.41 88.28 CompShaft-Power Losses (Driven Wheel) kW 92.23 96.26 Turbine Train Power Losses (Driving Wheel) Total Power Train Losses Total Power Train Loss Fraction Sync Gen kW kW 484.28 576.51 5.82% 337.90 434.16 7.12% Net Elect Power kW Power Cycle Ratio Net (Rankine/Brayton) Eff Cycle NET Elect Cycle Efficiency 0.366 9255.27 166% 0.370 0.345 5579.40 0.346 0.317 The key operating parameters are that the net power produced by the Ice-Rankine cycle is 9255 kWe compared to 5579 kWe in the off-peak Brayton cycle power generation process. The remarkable observation is that the Ice-Rankine cycle (discharge process) produces 66% more power than the standard Brayton cycle for the same waste heat source, for the same waste heat mass flow rate, and for a similar CO2 mass flow rates (67.5 kg/s in the Ice-Rankine cycle process versus 70.2 kg/s in the Brayton cycle). This increase in power occurs primarily because of the 5 1a Comp A inlet 2a Comp A Out 1b Comb B Inlet 2b Comp B Outlet 2c Preheat Hx In 3 Integ. Recup HP Internal Loc 4 Primary HX Inlet 5 Prim. HX Outlet 6 Turbine Out 7 Integ. Recup LP Internal Loc 8 Inter-Recup Inlet 9 Heat Rejection Water/Air or Ice cg1 Waste Heat Source cg2 Prim HX Exit cg3 Preheat HX Exit cg4 Stack Exhaust c1 Cooling Water Inlet c2 Cooling Water ExitPDF Image | Bulk Energy Storage using a Supercritical CO2 Waste Heat Recovery Power Plant
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