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The basic features are very similar to those described by Dostal in his ScD Thesis / Topical report (Ref. 2.1): one should refer to this document for additional detail. His design in turn has much in common with the GA GT-MHR. Some particulars on the PCU vessel are as follows: Vessel Type S-CO2 PCU PWR PV BWR PV GA GT-MHR PCU Dia. (m) Height (m) Operating Pressure (MPa) 7.6 12 8 (including generator: 18 m) 5 13 15 7.4 21 7 8.7 37 NA Thus the vessel in question appears to be within the range of those which are currently fabricable and transportable. In the future we hope to apply computer codes to more elegantly model the details of the power cycle arrangement. It should also be noted that such details can be expected to evolve as design work progresses. For example, the bypass valve shown was located as per Dostal’s recommendation; several other locations are conceptually possible, some of which are preferred by other (e.g. He) PCU designers. The location here is motivated by the fact that the return to IHX / Reactor and turbine exhaust streams are close in temperature (440 and 440oC, respectively), which minimizes thermal shock during the rapid transient which actuation of the bypass valve initiates. Also note that improved (multiported, wavy channel) versions of HeatricTM PCHE are now available, which will reduce the required PCU vessel diameter. 2.4 Cost-of Power Projections The approach followed for cost of power estimation was to start with definitive published analyses for similar systems and to proceed by changing only those cost category entries needed to transform the original design into (as close as practicable an approximation to) the S-CO2 plant version. Coupled with estimates of the concurrent change in plant thermal efficiency, one can then estimate busbar costs in mills/kWhre. Reference (2.2) reports results for two indirect cycle plants: one using helium as the primary coolant coupled to a Rankine secondary steam cycle; and the other employing a Brayton secondary power cycle with helium as the working fluid. Table 2.2 summarizes the busbar cost projections for these plants, taken from Ref (2.2) including those for other options which it documents, which provide additional perspective. 13PDF Image | Report No: MIT-GFR-014 Topical Report 300 MWe Supercritical CO2 Plant Layout and Design
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