| 摘要 |
[Problem to be solved] In a system of absorbing CO 2 from exhaust gas comprising absorbent regeneration equipment (a reclaimer), the present invention solves a problem of a water balance associated with operation of the reclaimer to keep the CO 2 absorption system under optimal conditions. [Solution] A method of controlling a CO 2 chemical absorption system comprising CO 2 chemical absorption equipment and absorbent regeneration equipment, the CO 2 chemical absorption equipment being involved in contacting CO 2 in exhaust gas with amine absorbent in an absorber column, heating the CO 2 absorbed absorbent in a desorber column to release CO 2 , cooling the CO 2 removed exhaust gas to separate condensed water, and circulating the condensed water to the desorber column; and the absorbent regeneration equipment being involved in withdrawing the amine absorbent from the desorber column, removing heat stable salts accumulated in the amine absorbent by a distillation process, and then supplying resultant vapor of the amine absorbent to the desorber column, the method comprising: rerouting some of condensed water obtained by cooling the CO 2 removed exhaust gas in the desorber column, and adding a solution of an inorganic alkaline salt as a solvent to the absorbent regeneration equipment to remove heat stable salts accumulated in the amine absorbent in the distillation process. |
