Method and system for carbon dioxide energy storage in a power generation system

A power generation system comprising:

• a power generation cycle comprising a CO2 turbine;
• and
• a CO2 storage system coupled in flow communication with said power generation cycle, said CO2 storage system comprising:
• a storage tank configured to store a CO2 slurry including dry ice and liquid CO2, wherein said storage tank stores the slurry at the CO2 triple point temperature and pressure;
• a first pump coupled in flow communication with said storage tank, wherein said first pump is configured to receive the CO2 slurry from said storage tank and to increase a pressure of the CO2 slurry to a pressure above the CO2 triple point pressure;
• a contactor coupled in flow communication with said first pump, wherein said contactor is configured to receive the CO2 slurry from said pump and also to receive a first flow of gaseous CO2 from said CO2 turbine at a pressure above the CO2 triple point pressure;
• a decanter coupled in flow communication with said storage tank, wherein said decanter is configured to receive a flow of the CO2 slurry from said storage tank and to remove a flow of high percentage dry ice slurry from the flow of CO2 slurry;
• and
• a second pump coupled in flow communication between said decanter and said contactor, wherein said second pump is configured to channel the flow of high percentage dry ice slurry from the CO2 slurry to said contactor at a pressure above the CO2 triple point pressure.

A method of operating a power generation system including a power generation cycle and a CO2 storage system, wherein said method comprises:

• storing a slurry of dry ice and liquid CO2 in a storage tank at the triple point temperature and pressure of CO2;
• pumping the slurry through a first pump to increase the pressure of the slurry above the CO2 triple point pressure;
• channeling the slurry to a contactor;
• channeling a first flow of gaseous CO2 to the contactor at a pressure above the CO2 triple point pressure;
• contacting the flow of slurry with the first flow of high pressure gaseous CO2 within the contactor to condense the gaseous CO2 into liquid CO2;
• channeling a flow of CO2 slurry from the storage tank to a decanter and removing a flow of high percentage dry ice slurry from the flow of CO2 slurry using the decanter;
• and
• channeling the flow of high percentage dry ice slurry from the decanter to the contactor using a second pump, wherein the second pump increases the pressure of the flow of dry ice to above the CO2 triple point pressure.