A CO 2 recovery system according to the present invention includes: a cooling tower that uses cooling water to cool a CO 2 -containing exhaust gas discharged from industrial equipment such as a boiler or a gas turbine; a CO 2 absorber that brings the cooled CO 2 -containing exhaust gas into contact with a CO 2 -absorbent that absorbs CO 2 , thereby removing the CO 2 from the exhaust gas; and a first absorbent regenerator and a second absorbent regenerator that release CO 2 from a CO 2 -absorbent that has absorbed CO 2 (rich solution), thereby regenerating the CO 2 -absorbent. A second lean solution at the outlet of the second absorbent regenerator is subjected to vacuum flash vaporization, and the resulting vapor is inputted to the first absorbent regenerator.
1. A CO 2 recovery system comprising:
a CO 2 absorber for bringing a cooled CO 2 -containing exhaust gas into contact with a CO 2 -absorbent absorbing CO 2 so as to remove CO 2 , from the exhaust gas;
a first absorbent regenerator for regenerating an absorbent by releasing CO 2 from a CO 2 -absorbent having absorbed CO 2 ;
a second absorbent regenerator for regenerating an absorbent by releasing residual CO 2 from a first lean solution discharged from the first absorbent regenerator; and
a flash drum for flashing a second lean solution discharged from the second absorbent regenerator,
wherein vapor generated in the flash drum is inputted to the first absorbent regenerator, and
wherein the CO 2 recovery system, further comprises a lean/lean solution heat exchanger for heat-exchanging the first lean solution with a third lean solution flashed in the flash drum.
2. A CO 2 recovery system comprising:
a CO 2 absorber for bringing cooled CO 2 containing exhaust gas into contact with a CO 2 -absorbent absorbing CO 2 so as to remove CO 2 from the exhaust gas;
a first absorbent regenerator for regenerating an absorbent by releasing CO 2 from a CO 2 -absorbent having absorbed CO 2 ;
a second absorbent regenerator for regenerating an absorbent by releasing residual CO 2 from a first lean solution discharged from the first absorbent regenerator; and
a flash drum for flashing a second lean solution discharged from the second absorbent regenerator,
wherein vapor generated in the flash drum is inputted to the first absorbent regenerator, and
wherein the CO 2 recovery system further comprises:
a port provided in the first absorbent regenerator at a middle portion in a vertical axis direction of the first absorbent regenerator, for extracting a semi-lean solution;
a circulation line to which the semi-lean solution is extracted, for returning the semi-lean solution to a return port closer to the bottom than the extraction port; and
a semi-lean/lean solution heat exchanger provided on the circulation line, for heat-exchanging a third lean solution flashed in the flash drum with the semi-lean solution.
3. A CO 2 recovery system comprising:
a CO 2 absorber for bringing cooled CO 2 containing exhaust gas into contact with a CO 2 -absorbent absorbing CO 2 so as to remove CO, from the exhaust gas;
a first absorbent regenerator for regenerating an absorbent by releasing CO 2 from a CO 2 -absorbent having absorbed CO 2 ;
a second absorbent regenerator for regenerating an absorbent by releasing residual CO 2 from a first lean solution discharged from the first absorbent regenerator; and
a flash drum for flashing a second lean solution discharged from the second absorbent regenerator,
wherein vapor generated in the flash drum is inputted to the first absorbent regenerator, and
wherein the CO 2 recovery system further comprises:
a lean/lean solution heat exchanger for heat-exchanging the first lean solution with a third lean solution flashed in the flash drum;
a port provided in the first absorbent regenerator at a middle portion in a vertical axis direction of the first absorbent regenerator, for extracting a semi-lean solution;
a circulation line to which the semi-lean solution is extracted, for returning the semi-lean solution to a return port closer to the bottom than the extraction port; and
a semi-lean/lean solution heat exchanger provided on the circulation line, for heat-exchanging the third lean solution with the semi-lean solution.
4. The CO 2 recovery system according to claim 1 , further comprising:
a cooling tower for cooling the CO 2 -containing exhaust gas by cooling water.
5. The CO 2 recovery system according to claim 2 further comprising:
a cooling tower for cooling the CO 2 -containing exhaust gas by cooling water.
6. The CO 2 recovery system according to claim 3 , further comprising:
a cooling tower for cooling the CO 2 -containing exhaust gas by cooling water.