Carbon dioxide capture systems

A carbon dioxide capture system comprising a plurality of carbon dioxide adsorption/desorption sections, each of which comprises:

• a bubbling fluidized bed adsorption column in which a carbon dioxide adsorbent is moved from the top to the bottom;
• a bubbling fluidized bed desorption column in which a carbon dioxide adsorbent is moved from the top to the bottom;
• a first connection line connecting the bottom of the bubbling fluidized bed adsorption column to the top of the bubbling fluidized bed desorption column;
• a second connection line connecting the bottom of the bubbling fluidized bed desorption column to the top of the bubbling fluidized bed adsorption column;
• and a cyclone disposed between the second connection line and the bubbling fluidized bed adsorption column, wherein at least one of the plurality of carbon dioxide adsorption/desorption sections is constructed such that heat is exchangeable.

A carbon dioxide capture system comprising a plurality of carbon dioxide adsorption/desorption sections, each of which comprises:

• a diluted fluidized bed adsorption column in which a carbon dioxide adsorbent is moved from the bottom to the top;
• a diluted fluidized bed desorption column in which a carbon dioxide adsorbent is moved from the bottom to the top;
• two storage columns connecting the diluted fluidized bed adsorption column to the diluted fluidized bed desorption column;
• a cyclone disposed between the diluted fluidized bed adsorption column and one of the storage columns;
• and a cyclone disposed between the diluted fluidized bed desorption column and the other storage column, wherein at least one of the plurality of carbon dioxide adsorption/desorption sections is constructed such that heat is exchangeable.

A carbon dioxide capture method for selective separation of carbon dioxide from flue gases

• wherein carbon dioxide adsorbents are filled in a plurality of carbon dioxide adsorption/desorption sections,
• carbon dioxide is continuously adsorbed and desorbed while the carbon dioxide adsorbents circulate through carbon dioxide adsorption and desorption regions of the carbon dioxide adsorption/desorption sections,
• the carbon dioxide adsorbent filled in at least one of the carbon dioxide adsorption/desorption sections has higher carbon dioxide adsorption and desorption temperatures than the carbon dioxide adsorbent filled in the adjacent adsorption/desorption section, and
• adsorption heat generated from the adsorption region of the carbon dioxide adsorption/desorption section filled with the carbon dioxide adsorbent having higher carbon dioxide adsorption and desorption temperatures is transferred to the desorption region of the adsorption/desorption section filled with the carbon dioxide adsorbent having lower carbon dioxide adsorption and desorption temperatures and is used for the desorption of carbon dioxide.