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Other Key Components GTI has completed a steady-state modeling study of all design and off- design cases, for both Simple Cycle and RCBC testing. Information from this study has been used to develop specifications for key components. In addition, development of a transient model is underway. The objective is to develop a tool to simulate start-up, trip, shut-down and transient cases. The STEP Demo will validate steady- state and transient models critical for operations and for future commercial design and controls. GTI is leading the procurement of major hardware including the heater, compressor, recuperators, and cooling tower. The heater is a natural gas fired with a tube bundle fabricated out of Inconel 740H to accommodate the >700°C, 250 bar sCO2 conditions. It is based upon a duct-fired Heat Recovery Steam Generator (HRSG). The design is completed and materials ordered. A schematic is shown in Figure 6. The compressor will be sourced from GE Oil & Gas Baker Hughes, and leverages an existing commercial product line as well as work undertaken in the DOE-funded Apollo program. The heat exchangers include the high-temperature recuperator (HTR), low-temperature recuperator (LTR), and cooler. All units are planned to be compact heat exchangers with high surface area/volume ratios. GTI is currently engaging several vendors to discuss their product offerings and their suitability for the STEP operating Figure 6. Schematic of STEP gas-fired heater conditions. Candidate exchangers include printed circuit heat exchangers [PCHE], micro-tube and shell exchangers, and other technologies. Example technologies are shown in Figure 7. At this time, the HTR has been ordered and will be a PCHE-type with a 50 MWth capacity. Summary Figure 7. Examples of compact sCO2 recuperators Supercritical CO2 power cycles promise substantial cost, emissions, and operational benefits that apply to a wide range of power applications including coal, natural gas, waste heat, concentrated solar, biomass, geothermal, nuclear, and shipboard propulsion. The STEP 10MWe program will advance the technology readiness level of this promising technology from TRL of 3 level to a TRL of 7. The project is well underway, with groundbreaking at the SwRI site in October 2018. A strong team is in place and executing smoothly. Additional partners are welcome. Further specifics on the Joint Industry Program are described below. 7PDF Image | 10 MWe Supercritical Carbon Dioxide sCO2 Pilot Power Plant
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