Patent ID: 8016919

Claim:
A CO 2 recovery system including an absorption tower that receives CO 2 -containing gas and CO 2 -absorbing solution, and that causes the CO 2 -containing gas to come into contact with the CO 2 -absorbing solution to produce CO 2 rich solution, and a regeneration tower that receives the rich solution and produces lean solution from the rich solution by removing CO 2 from the rich solution, the CO 2 recovery system comprising: a single filtering unit located downstream of the regeneration tower, that includes an outer casing and at least one filter member, wherein when the lean solution originating from the regeneration tower is supplied to the outer casing, the filter member filters out solid particles contained in the solution through a first line so that the lean solution not containing the solid particles is supplied through a lean-solution supply line to the regeneration tower; a single washing unit located downstream of the regeneration tower, connected to the filtering unit through a second line, that washes out with backwash water the solid particles filtered out by the filter member so that the backwash water containing the solid particles is supplied to an evaporating unit located downstream of the washing unit; the evaporating unit that receives the backwash water containing the solid particles from the washing unit heats the received backwash water thereby vaporizing CO 2 -absorbing solution remaining in the received backwash water and obtaining concentrated solid particles and then discharges the solid-particle concentrated backwash water to a reclaimer located downstream of the evaporating unit while supplying the vaporized CO 2 -absorbing solution passing through one of vaporized CO 2 -absorbing solution supply lines to the regeneration tower; and the reclaimer that receives the solid-particles concentrated backwash water from the evaporating unit heats the received backwash water thereby vaporizing the CO 2 -absorbing solution remaining in the received backwash water and obtaining concentrated solid particles so that the CO 2 -absorbing solution is supplied through another of vaporized CO 2 -absorbing solution supply lines to the regeneration tower while removing the concentrated solid particles, wherein the first line and the second line are respectively provided with valves so that the filtering unit receives alternately the said solution or the backwash water.