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Development Of A Supercritical Carbon Dioxide Brayton Cycle

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Development Of A Supercritical Carbon Dioxide Brayton Cycle ( development-of-supercritical-carbon-dioxide-brayton-cycle )

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Table 3-13. Working conditions in the intermediate heat transport loop. Parameter Nominal Value Power, MW 50 Heat Loss, MW 1.79 Outlet temperature of HTLHX, °C 875.1 HTLHX pressure drop, MPa 0.139 Pressure, MPa 2 Mass Flow, kg/s 27.5 The HTLHX is placed in the secondary side in parallel with the PCU for the 3 shaft and combined cycles. In this configuration, the IHX cold-side outlet fluid is split, with most going towards the PCU and the remainder going towards the hydrogen production plant. A small circulator is required to compensate for the pressure loss across the HTLHX and allow the fluid streams to mix downstream of the PCU [Oh, et al., 2006]. The combined cycle, illustrated in Figure 3-21, an indirect cycle with a combined power conversion unit (PCU) configuration and an intermediate heat transport loop for hydrogen production. The primary side of the loop consists of a high temperature nuclear reactor, intermediate heat exchanger (IHX), and a circulator. The conditions for this loop are summarized in Table 3-14. The intermediate heat transfer loop for delivering process heat to hydrogen production was developed at INL and summarized in INL/EXT-05-00453. The PCU configuration, illustrated in Figure 3-21, consists of; (1) a primary loop (2) an intermediate heat transport loop in parallel with (3) the PCU with a Brayton top cycle consisting of a gas turbine, compressor and coupled to a Rankine bottoming cycle through a steam generator. The Rankine cycle consists of a steam turbine, condenser and a pump. This cycle was simulated using helium as the working fluid in the primary and intermediate heat transport loop. Helium, CO2 and the N2-He mixture were simulated in the PCU while water was used in Rankine cycle. 3 12 6 S1 7 8a S2 S4 S3 4 8b 5b 5c To H2 Process 9 5a mixer IHX HTLHX Figure 3-21. Schematic of the combined cycle. 45 Reactor

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