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High output power + low cost + low O&M cost = low LCOE • The sCO2 cycle provides a 10 to 20% lower LCOE compared to traditional heat recovery steam for baseload and cyclic operation • Lower installed cost for the sCO2 system is due to its smaller system footprint and reduced balance of plant requirements • Lower O & M costs for sCO2 are possible because plant personnel are not needed for water quality and treatment support functions typically found in steam-based plants • The growing trend to operate CCGT plants on an as-needed basis favors single-phase sCO2 over steam due to no hardware damage and premature life due to thermal fatigue and flow- assisted corrosion Figure 10: The lower LCOE of the sCO2 system makes for an economically superior solution for both baseload and cyclic operation compared to heat recovery steam systems. ECHOGEN HEAT ENGINE STATUS Echogen Power Systems is currently entering the product introduction and customer demonstration phase of commercialization through several parallel initiatives. During the AEP test program conducted from April 2010 through April 2011 (Figure 11), eight turbo-alternator configurations were evaluated (4, 5). Test data was collected to calculate and compare predicted versus actual isentropic, aerodynamic, fluid power and grid power performance. In general, actual performance was found to be slightly better than predicted values (Figure 12). Results were used to define design features for power turbine improvements which include increasing rated power output from 250 kWe to 400 kWe. Two configurations of new power turbine hardware are currently in fabrication and will begin long term endurance testing during the next deployment of the demonstration system. The heat engine is currently being installed at Akron Energy Systems (Akron, OH), a municipal district heating utility, located close to Echogen’s corporate offices. Site design was completed by Echogen’s engineering team during mid-2011. Installation of the balance of plant hardware is now underway with system commissioning scheduled for April 2012 (Figure 13). Long term endurance testing will provide the opportunity to operate the system with supercritical Figure 11: Initial testing of the Echogen 250 kWe demonstration system was completed during mid-2011 at the American Electric Power (AEP) Dolan Technology Center (Groveport, OH U.S.A.). 12PDF Image | Echogen Power Systems SCO2
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