CO₂recovery device

摘要

A regeneration tower 7 of a CO2 recovery unit includes an upper regeneration portion 51 that has a tray portion 45, a lower regeneration portion 52 provided below the upper regeneration portion 51 and having a liquid dispersion portion 46, and a supply line L5 that supplies absorbing liquid stored in the tray portion 45 to the liquid dispersion portion 46. The supply line L5 is provided with a heat exchanger 53, and the absorbing liquid is circulated using the density difference between the absorbing liquid flowing before the heat exchanger 53 and the absorbing liquid flowing after the heat exchanger 53 as a driving force. This reduces the cost of equipment while reducing the power in the delivery of the absorbing liquid in the regeneration portion.

主权项

1. A CO2 recovery unit comprising:
an absorbing tower that allows absorbing liquid to absorb CO2 in exhaust gas; and a regeneration tower that allows the absorbing liquid that absorbed CO2 in the absorbing tower to discharge CO2, wherein the absorbing liquid that discharged CO2 in the regeneration tower is reused in the absorbing tower, wherein the regeneration tower includes:
a first regeneration portion having a first packing layer in which the absorbing liquid that has absorbed CO2 comes in contact with steam to heat the absorbing liquid and a first tray portion that stores the absorbing liquid that has passed the first packing layer;a second regeneration portion provided below the first regeneration portion and having a second tray portion, a second packing layer in which the absorbing liquid that has passed the first regeneration portion comes in contact with steam to heat the absorbing liquid, and a liquid dispersion portion that supplies the second packing layer with the absorbing liquid that has passed the first regeneration portion;a first supply pipe that connects the first tray portion and the liquid dispersion portion to supply the absorbing liquid stored in the first tray portion to the liquid dispersion portion;a second supply pipe that connects the second tray portion and a part below the second tray portion to supply the absorbing liquid stored in the second tray portion to the part below the second tray portion; anda reboiler that is provided on the second supply pipe and that is adapted to produce steam by heating the absorbing liquid; anda heating portion is adapted to produce gaseous CO2 and steam by heating the absorbing liquid, wherein the first supply pipe includes the heating portion that heats the absorbing liquid to circulate the absorbing liquid using a density difference between the absorbing liquid flowing before the heating portion and the absorbing liquid flowing after the heating portion as a driving force, and wherein the driving force for circulating the absorbing liquid is generated by the gaseous CO2 and steam generated from the absorbing liquid in the heating portion.