Carbon dioxide recovery

A method for recovering carbon dioxide (CO2), comprising:

• receiving, in a CO2 separation system, a gas mixture from a power plant, wherein the gas mixture comprises CO2, and the CO2 separation system comprises:
• a rotating freezer/melter having a freezing zone, a melting zone, and a rotor;
• a CO2 separation device downstream of the freezing zone of the rotating freezer/melter;
• and
• a compressor downstream of the CO2 separation device;
• flowing the gas mixture through the rotor while the rotor is in the freezing zone;
• capturing solid CO2 from the gas mixture on the rotor while the rotor is in the freezing zone;
• melting the solid CO2 captured on the rotor while the rotor is in the melting zone, thereby forming liquid CO2;
• flowing the liquid CO2 through the rotor while the rotor is in the melting zone;
• maintaining the melting zone at a higher pressure than the freezing zone to preserve the melted CO2 in a liquid state as it exits the melting zone;
• routing the remaining gas mixture out of the freezing zone and into the CO2 separation device;
• recovering residual CO2 from the remaining gas mixture using the CO2 separation device;
• pressurizing the residual CO2 using the compressor to produce a pressurized CO2 vapor stream;
• and
• using the pressurized CO2 vapor stream to melt the solid CO2 within the melting zone of the rotating freezer/melter.