Patent ID: 7485274

Claim:
A CO 2 recovery apparatus comprising: a CO 2 absorption tower for removing CO 2 from a waste gas containing CO 2 discharged from industrial facilities by contacting the waste gas with a CO 2 absorbing solution for absorbing CO 2 ; a regeneration tower for regenerating a rich solution which is a CO 2 absorbing solution and absorbed CO 2 into a lean solution which is a CO 2 absorbing solution and absorbed no CO 2 by removing CO 2 from the rich solution, wherein the lean solution obtained by removing CO 2 in a regeneration tower is reutilized as a CO 2 absorbing solution in an absorption tower; and a flow path for returning extracted, temperature risen semi-lean solution to the regeneration tower wherein at least a part of the semi-lean solution obtained by removing a partial CO 2 from the rich solution infused in the regeneration tower from an upper part of the regeneration tower is extracted, raised its temperature by heat exchanging with a high-temperature waste gas in a gas duct of the industrial facility, and then returned to the regeneration tower.