The turbomachinery R&D focuses on advancing technologies and designs of turbomachinery to be used in the supercritical CO2 power cycle. Operating power cycles, either directly or indirectly, with supercritical CO2 offers potential for further improvements in power cycle efficiencies and lower costs. However, the utilization of supercritical CO2 as the working fluid must be considered when designing the turbines. Extremely compact turbine sizes are possible for use in the supercritical CO2-based power cycles. These turbines will have high power density, lower peripheral speeds, high blade loading, and high shaft speeds, all of which will factor into the final turbine designs. The high pressure, relatively high temperature, uncertainty of the CO2 state near the critical point, and high power density create design challenges for the supercritical CO2 turbomachinery. The R&D will consider all aspects of the turbomachinery, including the turbo-expander, compressors, pumps, airfoils, turbine coupling with the motor/generator, seals, casings, bearings, shafts, and valves. The approach would cover a multiphase development to design and test sCO2 turbomachinery, followed by manufacture of commercial prototypes.

NETL supports several Turbomachinery Projects.

GE dry gas seal concept for utility scale turbo expanders