| 摘要 |
An object of the present invention is to provide a CO 2 removal apparatus that prevents release of an amine compound of an absorbing solution from a CO 2 absorption device. The CO 2 removal apparatus includes a desorption column 13 that heats and regenerates an amine compound aqueous solution discharged from a decarbonator 1 making counterflow contact of a combustion exhaust gas and an amine compound aqueous solution; and reflux means that refluxes an amine compound aqueous solution regenerated in the desorption column 13 to the decarbonator 1 via a cooler 19. A contact section that makes counterflow contact of reflux water of the desorption column 13 and a CO 2 -removed combustion exhaust gas is formed in two stages, and the cooler 19 on the downstream side of the desorption column is also formed in two stages. Reflux water from the first stage cooler is supplied to the first stage contact section, and reflux water from the second stage cooler is supplied to the second stage contact section. As a result, the reflux water from the cooler 19 on the downstream side of the desorption column 13 can be efficiently used for amine removal of the decarbonator 1, and a concentration of an amine released from the decarbonator can be reduced. |
