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10 MWe Supercritical Carbon Dioxide sCO2 Pilot Power Plant

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10 MWe Supercritical Carbon Dioxide sCO2 Pilot Power Plant ( 10-mwe-supercritical-carbon-dioxide-sco2-pilot-power-plant )

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Project Organization and Scope GTI, SwRI, and GE have formed a team to direct all STEP Demo project technical activities in line with program goals and objectives. GTI is responsible for overall management of the project and for communication with DOE. GTI is currently performing technology management, systems engineering and integration, major component procurements and will participate in testing in a test management role. SwRI will provide the host site for the test facility. They are performing the facility design engineering and will construct the test facility, including the utility infrastructure. SwRI will perform facility commissioning as well as direct and execute test operations. GE Global Research (GE) is providing the technical definition for the turbomachinery (turbines and compressors) as well as a first-of-a-kind sCO2 turbine stop/control valve based on their line of valves for high-pressure steam turbines. The combined team integrates the strengths of each individual organization and in aggregate, have completed or performing over two dozen sCO2 technology related project forming the building blocks for a successful STEP Demo. GTI has proven leadership in large pilot/facility projects including joint government/industry/international partnerships. SwRI offers technology development and test operations experience on-site at the chosen San Antonio, TX test site. GE leverages their experience and existing 1 MWe turbomachinery component hardware developed for DOE SunShot program to reduce program risk. The team has developed a phased testing approach to successively mitigate risks. The testing will occur in two distinct phases as shown in Figures 2a and 2b. The initial system configuration will be the sCO2 Simple Cycle which comprises a single compressor, turbine, recuperator, and cooler. Heat will be supplied by a natural-gas fired heater that closely resembles a duct-fired Heat Recovery Steam Generator (HRSG). In Simple Cycle testing, sCO2 will be delivered to the turbine at approximately 500°C and 250 bar. This test configuration offers the shortest time to steady-state and transient data, while demonstrating controls and operability of the system, and performance validation of key components. In the second phase of testing, the system will be reconfigured to the Recompression Closed Brayton Cycle (RCBC). This is a high-efficiency cycle capable of achieving the >50% thermodynamic efficiency goals of the program. In this phase, a second (lower-temperature) recuperator and a bypass compressor will be installed. The turbine inlet temperature will be increased to the target level of 715°C. This phased testing approach will address specific technical risks while minimizing added complexity at each phase. In this manner, programmatic risk can be minimized by reducing unnecessary complexity and applying lessons learned from prior phases to address technical challenges. 3

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10 MWe Supercritical Carbon Dioxide sCO2 Pilot Power Plant

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