CO2 RECOVERY DEVICE AND CO2 RECOVERY METHOD

摘要

Provided are a CO 2 recovery unit and a CO 2 recovery method which enable stable operation to continue even if an operation condition has changed. This CO 2 recovery unit (1) is equipped with: a CO 2 -absorber (14) that causes CO 2 included in flue gas (11A) to be absorbed into a CO 2 -absorbing solution (13); a CO 2 -regenerator (15) which regenerates the CO 2 -absorbing solution (13) by heating; and a CO 2 recovery amount control unit (111) which calculates a computed target value for the CO 2 recovery amount and a computed target value for the CO 2 recovery rate on the basis of a set value for the CO 2 recovery rate, actual measured values of the CO 2 concentration, gas flow rate, and temperature of the flue gas (11A), and maximum values for the CO 2 recovery amounts in the CO 2 -absorber (14) and the CO 2 -regenerator (15). On the basis of the set value for the CO 2 recovery rate or the computed target value for the CO 2 recovery rate, the CO 2 recovery amount control unit (111) controls: the amount of the CO 2 -absorbing solution (13) supplied to the CO 2 -absorber (14); the amount of the CO 2 -absorbing solution (13) supplied to the CO 2 -regenerator (15); and the amount of saturated steam (S) supplied to a regeneration heater (31) of the CO 2 -regenerator (15).