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this case has been accomplished using AXIALTM: the refining of AXIALTM to be able to design compressors at lower temperatures is in progress. Currently, there is no indication that the compressor efficiency will be reduced at lower inlet temperature. PP PP Steam turbine: 55 stages / 250 MW Mitsubishi Heavy Industries Ltd, Japan (with casing) 55m Figure 13.8 Comparison of turbine sizes Helium turbine: 17 stages / 333 MW (167 MWe) X.L.Yan, L.M. Lidsky (MIT) (without casing) Supercritical CO2 turbine: 4 stages / 450 MW (300 MWe) (without casing) Compressors are of comparable size Supercritical COB2B gains an additional efficiency benefit over the helium cycle due to PP better turbomachinery performance. The AXIALTM efficiency results are in accordance with the findings of Japanese calculations performed by Mitsubishi [Kato et. al, 2002] and [Muto et al., 2003] where a comparison of helium and COB2B turbomachinery was performed, with the conclusion that COB2B turbomachinery achieves higher efficiency by about 2%. This is mainly caused by the lower number of stages. In addition the size of the turbomachinery is extremely small. Figure 13.8 shows a comparison of steam, helium and supercritical turbines. In addition to the size reduction, another advantage of the COB2B turbine is that it can be a single body design, whereas both steam and helium turbines usually employ more turbine bodies (high, medium and low-pressure in the case of steam, a high-pressure unit to power compressors and a low-pressure unit to power the generator in the case of helium). This further increases the difference in size as additional plena and piping are necessary. 280PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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