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Operation and Analysis of a Supercritical CO2 Brayton Cycle

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Operation and Analysis of a Supercritical CO2 Brayton Cycle ( operation-and-analysis-supercritical-co2-brayton-cycle )

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A B Figure 3-4: The left image shows an engineering blow up of labyrinth seal. The light blue ring in made of brass and has four teeth that approach the steps on the rotating shaft. The right image shows a photo of the compressor wheel and the four steps on the shaft. Figure 3-5: Pictures of the Haskel pumps on the SCO2 loop. 3.1.2 Stress Analysis of Turbomachinery Housing The S-CO2 Brayton loop contains a few custom-built components, all of which are contained within the TAC unit pictured in Figure 3-6. Each of these custom components was analyzed with multiple methods to determine their maximum allowable working pressure (MAWP). First, simple hand calculations were performed by SNL to verify the basic design. Next, more detailed analyses were generated by Barber- Nichols. Finally, these analyses were verified by performing a detailed Finite Element Analysis (FEA) of each component for preload, shutdown, operating, and hydrostatic test scenarios. The results of each of these analyses for each custom component of the turbo-machinery, including the bolts, are found in the Pressure Safety Data Package. The engineering drawing in Figure 3-7 is an example of the FEA results generated by SNL. Good agreement was seen between the Barber-Nichols and SNL FEA analyses. After construction, these components were assembled and hydro tested to 3300 psig. In order to maintain pressure, the bolts on 28

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