US 12,403,422 B2
CO2 recovery unit and CO2 recovery method
Hiroshi Tanaka, Tokyo (JP); Takuya Hirata, Tokyo (JP); Tatsuya Tsujiuchi, Tokyo (JP); Takashi Kamijo, Kanagawa (JP); and Shimpei Kawasaki, Kanagawa (JP)
Assigned to Mitsubishi Heavy Industries, Ltd., Tokyo (JP); and The Kansai Electric Power Co., Inc., Osaka (JP)
Appl. No. 17/915,804
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP); and The Kansai Electric Power Co., Inc., Osaka (JP)
PCT Filed Jan. 13, 2021, PCT No. PCT/JP2021/000852
§ 371(c)(1), (2) Date Sep. 29, 2022,
PCT Pub. No. WO2021/199567, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-066881 (JP), filed on Apr. 2, 2020.
Prior Publication US 2023/0191314 A1, Jun. 22, 2023
Int. Cl. B01D 53/14 (2006.01); B01D 53/18 (2006.01); B01D 53/62 (2006.01); B01D 53/78 (2006.01)
CPC B01D 53/1425 (2013.01) [B01D 53/1406 (2013.01); B01D 53/1418 (2013.01); B01D 53/18 (2013.01); B01D 53/62 (2013.01); B01D 53/78 (2013.01); B01D 2252/20478 (2013.01); B01D 2257/504 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A CO2 recovery unit comprising:
a CO2 absorber that brings a gas having a low CO2 concentration into countercurrent contact with a CO2 absorbent to remove CO2 from the gas;
an absorbent regenerator that performs a heat exchange between a rich solution containing absorbed CO2 and water vapor flowed from a reboiler to regenerate the CO2 absorbent;
a rich solution supply line that discharges a rich solution in which CO2 has been absorbed by the CO2 absorbent in the CO2 absorber, from a bottom part of the CO2 absorber and supplies the rich solution to an upper side of the absorbent regenerator; and
a lean solution supply line that discharges a lean solution in which CO2 has been released from the rich solution in the absorbent regenerator, from a bottom part of the absorbent regenerator and supplies the lean solution as the CO2 absorbent to an upper side of the CO2 absorber,
wherein the CO2 absorber includes at least two or more CO2 absorption sections including a first CO2 absorption section and a second CO2 absorption section located below the first CO2 absorption section, and
the CO2 recovery unit further comprises:
a first absorbent circulation line that discharges the CO2 absorbent from the first CO2 absorption section and supplies the CO2 absorbent as a first circulation solution to an upper side of the first CO2 absorption section;
a second absorbent circulation line that discharges the CO2 absorbent from the second CO2 absorption section and supplies the CO2 absorbent as a second circulation solution to an upper side of the second CO2 absorption section; and
an absorbent discharge line that discharges a part of the first circulation solution from the first absorbent circulation line and supply the part of the first circulation solution as a discharged solution to the second absorbent circulation line.