CO₂recovery unit

摘要

An absorbent regenerator includes: a rich solution supply line; a lean solution supply line; a lean-rich solution heat exchanger that is provided at an intersection of the lean solution supply line and the rich solution supply line; a branch portion that branches some of the rich solution at a downstream side of the lean-rich solution heat exchanger on the rich solution supply line; and a first mixing portion that mixes the some of the rich solution branched at the branch portion with a semi-lean solution, wherein a front end of a branch line through which the some of the branched rich solution is supplied is connected to a solution storage portion of the semi-lean solution which is located at an upper stage side of the absorbent regenerator divided into parts, and the some of the branched rich solution is mixed with the semi-lean solution.

主权项

1. A CO2 recovery unit comprising:
a CO2 absorber in which a CO2-containing gas comes into contact with a CO2 absorbent to remove CO2; and an absorbent regenerator in which a CO2-absorbed rich solution is regenerated by a regenerating heater, thereby reusing a lean solution in which CO2 has been removed in the absorbent regenerator, in the CO2 absorber as the CO2 absorbent, wherein the absorbent regenerator is divided into at least two parts and includes:
a rich solution supply line through which the rich solution is supplied to the absorbent regenerator from the CO2 absorber;a lean solution supply line through which the lean solution is supplied to the CO2 absorber from the absorbent regenerator;a lean-rich solution heat exchanger that is provided at an intersection of the lean solution supply line and the rich solution supply line to exchange heat between the lean solution and the rich solution;a branch portion that branches some of the rich solution at a downstream side of the lean-rich solution heat exchanger on the rich solution supply line;a branch line that branches at the branch portion on the rich solution supply line to supply the some of the rich solution:a solution storage portion of the semi-lean solution which is located at a bottom of an upper stage side of the absorbent regenerator divided into parts; anda mixing portion that mixes the some of the rich solution with a semi-lean solution in which CO2 has been partially removed from the rich solution in the absorbent regenerator, wherein a front end of the branch line is connected to the solution storage portion of the semi-lean solution to form the mixing portion that mixes the some of the rich solution with the semi-lean solution.