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Appl. Sci. 2020, 10, 4168 8 of 26 (Π) = 4.95, is used to assign the scale of the cycle and assess the applicability of such a size. The cycle model is altered with the selection of m ̇ max and an assumed medium-value turbine isentropic efficiency of 85%, and the final modified cycle performance parameters are listed in Table 3. Although the net electric power output of 67.33 MWe is not within the scale range of the suggested 700 MW NET Power plans, the net work of this cycle is in the scale of gas turbines used in small industrial and commercial applications by major OEMs. The market for turbines in the range of less than or equal to 70 MWe is believed to grow considerably in the near future [32]. To summarise, Table 4 offers the turbine boundary conditions which are used to design, size and assess a radial expander that could be fit for use. The obtained turbine fluid components is comparable to the NET Power working environment reported in literature [9] with a slightly higher CO2 mole fraction. This is because in the original NET Power cycle the combustion products are mixed with the turbine cooling stream which has a high CO2 component. Although the major fluid component entering the turbine is CO2 with 94.06% mole fraction, there are other fluid contaminants that could affect turbine design and performance. However, the assumption of a pure CO2 fluid is employed throughout the design process. Table 3. Modified cycle performance parameters. Data HTHE heat duty LTHE heat duty Thermal energy of feedstock (LHV) Turbine power output Vapor phase compressors Dense phase compressors Oxidant compressor Total flow compressors Natural gas compressor Air separation unit Storage compressor Net electric power output Net electric efficiency (LHV) Unit Value MW 242.92 MW 43.42 MWth 137.18 MWe 99.31 MWe 3.96 MWe 8.86 MWe 3.09 MWe 15.91 MWe 0.74 MWe 15.29 MWe 0.045 MWe 67.33 % 49.08 Table 4. Radial turbine boundary conditions from cycle model. Data Inlet temperature (T) Inlet pressure (P) Mass flow rate Outlet pressure Thermal power output (W ̇ ) Unit Value ◦C 900 bar 297 kg/s 354.2 bar 60 MWth 100.7 Fluid Component Mole Fractions CO2 % 94.06 H2O % 4.13 N2 % 1.14 Ar % 0.55 O2 % 0.12 3.2. Preliminary Design The design phase that builds on the results of the cycle analysis and the meanline code consists of the definition of three-dimensional geometries which are then further investigated using higher fidelity tools. The tool employed in this phase is the preliminary design solution generator, which is part of the AxSTREAM design suite, is initiated with defined settings (working fluid, loss models, number of stages), boundary conditions and geometry constraints. The boundary conditions required to obtainPDF Image | Radial Turbine Design for a Utility-Scale Supercritical CO2 Power
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