Supercritical CO2 Power Cycle Developments and Commercialization: Why ScCO2 can Displace Steam

M. Persichilli, A. Kacludis, E. Zdankiewicz, T. Held
Echogen Power Systems LLC, US

Keywords: waste heat to power, supercritical CO2, usable heat to power

Summary:

Echogen Power Systems (Akron, OH U.S.A.) is developing power generation technologies that transform heat from waste and renewable energy sources into electricity and process heat. The thermal engine technology; the Thermafficient® Heat Engine converts waste heat to power using a breakthrough supercritical CO2-based power cycle. Compared to organic and steam-based Rankine Cycle systems, supercritical CO2 can achieve high efficiencies over a wide temperature range of heat sources with compact components resulting in a smaller system footprint, lower capital and operating costs, and a Levelized Cost of Electricity (LCOE) below USD $0.04 per kwh. This paper presents an exemplary trade study comparison between the CO2 and steam-based heat recovery systems. An update is also provided for the Echogen 250 kW demonstration thermal engine which completed testing at the American Electric Power’s research center during 2011, current status of long term testing with this system at a commercial district heating organization, and a multi-megawatt heat engine that will be installed at a U.S. customer host site during 2012.