An apparatus and a method for recovering CO.sub.2 are provided in which an
energy efficiency is improved. The apparatus for recovering CO.sub.2
includes a flow path for returning extracted, temperature risen semi-lean
solution into a regeneration tower wherein at least a part of the
semi-lean solution obtained by removing a partial CO.sub.2 from a rich
solution infused in a 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 an
industrial facility such as a boiler, and then returned into the
regeneration tower.