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300 MWe Supercritical CO2 Plant Layout and Design

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300 MWe Supercritical CO2 Plant Layout and Design ( 300-mwe-supercritical-co2-plant-layout-and-design )

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Chapter 3 Alternative Power Conversion Cycle Arrangement 3.1 Introduction An alternative “unbundled”, plant layout has been devised. In the preceding chapter we showed an integral PCU vessel containing all components: similar to that employed in the GT MHR and by Dostal in his conceptualization of the S-CO2 power cycle. Concern over access for inspection and maintenance has inspired further work to unbundle the power plant into two vessels: one containing all heat exchangers and the other being the turbomachinery nacelle. Figure 3.1 is a picture of the model assembled to work out arrangement details and Fig. 3.2. is a key to component layout. Another advantage of the new arrangement is that a modest reduction in the largest vessel diameter can be realized. We currently estimate 5 m, which is the same as that for a large PWR--hence guaranteeing fabricability and transportability. The principal detrimental aspect is that the vessel now has six gas-duct wall penetrations as opposed to four with the prior monolithic all-in-one design. In the monolithic design as few as one penetration for ducts might be realized by using a coaxial inlet/outlet duct and by encapsulating all valves inside the PCU vessel. Another change of note is relocation of compressor flow split control valves to the compressor outlet, where fluid density is much higher, and also where added pressure loss will not move the CO2 state point closer, or even into, the two phase region. This change applies to both types of layout. 21

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