Oxygen Storage Incorporated into the Allam Oxy-Fuel Power Cycle
Southwest Research Institute will apply energy storage to a natural gas, direct-fired supercritical carbon dioxide (sCO2) power generation cycle (Allam-Fetvedt cycle with near 100% carbon capture) by incorporating oxygen storage adjacent to the air separation unit (ASU). By operating the ASU at higher capacities when power from alternative energies is available (e.g., wind power at night or solar photovoltaic power during the day) and storing liquid oxygen (LOX), greater output from the power plant can be achieved during times of peak electricity demand. Using LOX’s vaporization cooling to reduce the compression power of CO2 needed for the power cycle can result in more savings. Because the ASU equipment is electrically driven, no change to the power block is required to produce up to 20% greater power plant output during peak demand.
Improvements in the design and processes of CCS-equipped plants in high VRE environments could dramatically reduce the cost of a net-zero carbon system. Benefits include: