Patent ID: 8052948

Claim:
A CO 2 recovery system including an absorption tower that receives CO 2 -containing gas and CO 2 -absorbing solution, and causes the CO 2 -containing gas to come in 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, wherein semi-lean solution is produced as an intermediate product before producing the lean solution from the rich solution, the CO 2 recovery system comprising: a condenser that receives CO 2 removed from the rich solution and discharged through a head of the regeneration tower, and that condenses water vapor released along with the CO 2 into water; a separation drum that receives the CO 2 from the condenser and separates the water from the CO 2 ; two or more compressors that compress the CO 2 from the separation drum, wherein heat is generated while each compressor compresses the CO 2 ; a heat supplying unit that supplies the heat to the regeneration tower for heating any one of the lean solution and the semi-lean solution; a bifurcated path through which any one of a part of the lean solution extracted from a portion of bottom of the regeneration tower and the semi-lean solution extracted from a midcourse of the regeneration tower bifurcates and passes; a circulating path suitable for extracting any one of the part of the lean solution and the semi-lean solution through the bifurcated path, heat-exchanging with compression heat that is generated when CO 2 gas, which is released from a head of the regeneration tower is compressed by each compressor, and supplying again any one of the heated part of the lean solution and the semi-lean solution to the regeneration tower therethrough; and at least two heat exchangers that are located on intersections between the bifurcated path and a path suitable for conveying the CO 2 gas discharged from the top of the regeneration tower capable of transferring the heat to any one of the part of the lean solution or the semi-lean solution, wherein the condenser, the separation drum, the compressors, and the heat exchangers are located on the CO 2 gas conveying path.