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Waste Heat to Power WH2P Applications using SCO2

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Waste Heat to Power WH2P Applications using SCO2 ( waste-heat-power-wh2p-applications-using-sco2 )

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Figure 1: The supercritical CO2 power cycle. Figure 2: The first production unit of the EPS100 7.5 MWe heat engine is completing factory checkout tests at Dresser-Rand. Figure 3: The EPS5 300 kWe, heat engine is derived from the 250 kWe demonstration system (above) which has completed checkout testing and is now in endurance testing. CO2 may be found elsewhere (1-5). exchanger can be placed in direct contact with-high temperature heat sources, eliminating the cost and complexity of an intermediate heat transfer loop typically used in Organic Rankine Cycle (ORC) applications. Another advantage of sCO2 derives from EPS’s Cycle operation at well above the critical pressure for CO2. The Echogen Cycle enables single-phase heat transfer resulting in improved heat exchanger effectiveness while reducing exhaust heat exchanger size and cost. Echogen is currently building the EPS100, a 7.5 MWe thermal engine, which is designed for large industrial, fuel-fired processes, utility- scale power generation, and concentrated- solar thermal utility applications (Figure 2). The EPS100 uses a sCO2 turbine generator and incorporates a patent-pending, advanced power cycle to maximize exhaust thermal energy utilization by reducing the exhaust temperature to a minimum practical limit. Because the EPS100 power turbine is a separate unit, two different options for the turbine are being offered, one a high-speed, single-stage radial turbine, the other an API- compliant lower-speed axial turbine (1). A second system platform, the EPS5, is a 300 kWe thermal engine that is based on Echogen’s 250 kWe demonstration system tested at the American Electric Power (AEP) Dolan Technology Center during 2010-11 (Figure 3). The EPS5 utilizes a turbo-alternator and is designed for industrial and distributed generation applications. More de-tails on the Echogen Cycle and the operating characteristics and advantages of supercritical Combined Cycle Gas Turbines with an sCO2 Bottoming Cycle Across the United States, utility companies are turning to natural gas to generate electricity, with 258 plants expected to be built between 2011 through 2015, according to the U.S. Energy 2

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