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Subtask 2-4-3. Design Configurations The design of the VHTR power conversion unit is demonstrated using three-shaft, combined and reheated cycle designs to better understand the consequences of various cycle configurations. The primary side of the plant was kept constant for the three-shaft and combined cycles. The primary side working conditions for the VHTR are summarized in 3-11. Table 3-11. Summary of Primary working conditions for three-shaft and combined cycles. Parameter Nominal Value Power, MW 600 Inlet temperature, °C 500 Inlet Pressure, MPa 7.05 Outlet temperature, °C 900 Outlet pressure, MPa 7 IHX pressure drop, MPa 0.05 Mass Flow, kg/s 289 Working fluid He In the reheated cycle the primary side was altered to produce a more realistic model of the cycle. The reactor inlet temperature must be raised to take advantage of the reheat option. This was done by raising the mass flow through the primary side. The additional intermediate heat exchangers need for the reheat cycle make the use of helium in the primary side infeasible. The additional pressure drop incurred by the heat exchangers offsets the benefits of reheating. Therefore to take advantage of reheat a molten salt was used as the primary working fluid, which has a very small pressure drop relative to helium, making the use of reheating feasible. Flibe which is composed of 66% LiF and 42% BeF2, by weight, was used for this study. Flibe is an incompressible liquid and the pressure drop for this fluid is very low and was assumed to be negligible. The primary side working conditions for the reheat cycle are summarized in Table 3-12. Table 3-12. Summary of Primary working conditions for reheated cycle. The VHTR is envisioned to be a demonstration plant for hydrogen production and electrical generation. In order for hydrogen production to be possible process heat from the reactor must be transported to the hydrogen production plant. To accomplish this, an intermediate heat transport loop added to the VHTR design. This loop is coupled to the VHTR by means of the HTLHX. The loop that is used in this document was developed in a paper by Davis et. al. [2005]. The working conditions in that loop are summarized in 3-13. Parameter Nominal Value Power, MW 600 Pressure, MPa 0.1013 Reactor outlet temperature, °C 900 IHX pressure drop, MPa 0 44PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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