Wet-type carbon dioxide capturing equipment
Wet-type carbon dioxide capturing equipment includes a CO 2 absorption tower where CO 2 of an exhaust gas reacts with an absorbent, a CO 2 stripping tower where CO 2 is separated from a rich solution absorbed the CO 2 in the CO 2 absorption tower, a reboiler for supplying thermal energy to the CO 2 stripping tower to separate the CO 2 from the rich solution in the CO 2 stripping tower, a first heat exchanger for heating the rich solution by exchanging heat between a lean solution having the CO 2 separated therefrom in the CO 2 stripping tower and the rich solution, a mechanical vapor recompressor (MVR) for compressing a CO 2 gas separated in the CO 2 stripping tower, and a second heat exchanger for separating a portion of CO 2 from the rich solution by heating the rich solution by exchanging heat between the CO 2 gas compressed in the MVR and the rich solution passing through the first heat exchanger, in which the rich solution having CO 2 that is not separated in the second heat exchanger is input to the CO 2 stripping tower where the CO 2 is separated.
1. Wet-type carbon dioxide capturing equipment, comprising:
a CO 2 absorption tower configured to have CO 2 of an exhaust gas react with an absorbent;
a CO 2 stripping tower configured to separate CO 2 from a rich solution that absorbs the CO 2 in the CO 2 absorption tower;
a reboiler configured to supply thermal energy to the CO 2 stripping tower to separate the CO 2 from the rich solution in the CO 2 stripping tower;
a first heat exchanger configured to heat the rich solution by exchanging heat between a lean solution having the CO 2 separated therefrom in the CO 2 stripping tower and the rich solution that absorbs the CO 2 in the CO 2 absorption tower;
a mechanical vapor recompressor (MVR) configured to compress a CO 2 gas that is separated in the CO 2 stripping tower; and
a second heat exchanger configured to separate a portion of CO 2 from the rich solution by heating the rich solution by exchanging heat between the CO 2 gas compressed in the MVR and the rich solution passing through the first heat exchanger,
wherein the rich solution having CO 2 that is not separated in the second heat exchanger is input to the CO 2 stripping tower where the CO 2 is separated.
2. The wet-type carbon dioxide capturing equipment of claim 1 , wherein the first heat exchanger is a plate-type heat exchanger, the second heat exchanger is a shell & tube heat exchanger, the CO 2 gas compressed in the mechanical vapor recompressor is input to a tube side of the second heat exchanger, and the rich solution passing through the first heat exchanger is input to a shell side of the second heat exchanger.
3. The wet-type carbon dioxide capturing equipment of claim 1 , wherein steam is input to the reboiler as a heat source, the steam is condensed by transferring latent heat to the CO 2 stripping tower via the reboiler, and condensed water generated as the steam is condensed is input to a first condensed water tank.
4. The wet-type carbon dioxide capturing equipment of claim 3 , wherein the condensed water is generated as the CO 2 gas input to the second heat exchanger loses heat, a mixed fluid of the CO 2 gas, vapor, and the condensed water is input to a second condensed water tank, and the condensed water separated from the mixed fluid in the second condensed water tank is input to the CO 2 stripping tower.
5. The wet-type carbon dioxide capturing equipment of claim 4 , further comprising a third heat exchanger that is configured to exchange heat between the exhaust gas removed of the CO 2 in the CO 2 absorption tower and the CO 2 gas removed of the condensed water in the second condensed water tank.
6. The wet-type carbon dioxide capturing equipment of claim 4 , further comprising:
a second mechanical vapor recompressor (MVR) configured to compress the CO 2 gas removed of the condensed water in the second condensed water tank;
a fourth heat exchanger configured to separate a portion of the CO 2 from the rich solution by heating the rich solution by exchanging heat between the compressed CO 2 gas compressed in the second MVR and a portion of the rich solution passing through the first heat exchanger,
wherein the rich solution having CO 2 that is not separated in the fourth heat exchanger is input to the CO 2 stripping tower together with the rich solution having CO 2 that is not separated in the second heat exchanger.
7. The wet-type carbon dioxide capturing equipment of claim 6 , wherein the fourth heat exchanger is a shell & tube heat exchanger, the CO 2 gas compressed in the second mechanical vapor recompressor is input to a tube side of the fourth heat exchanger, and a portion of the rich solution passing through the first heat exchanger is input to a shell side of the fourth heat exchanger.
8. The wet-type carbon dioxide capturing equipment of claim 6 , wherein the condensed water is generated as the CO 2 gas input to the fourth heat exchanger loses heat, a mixed fluid of the CO 2 gas, vapor, and the condensed water is input to a third condensed water tank, and the condensed water separated from the mixed fluid in the third condensed water tank is input to the CO 2 stripping tower.
9. The wet-type carbon dioxide capturing equipment of claim 8 , further comprising a third heat exchanger that is configured to exchange heat between the exhaust gas removed of the CO 2 in the CO 2 absorption tower and the CO 2 gas removed of the condensed water in the third condensed water tank.
10. The wet-type carbon dioxide capturing equipment of claim 4 , further comprising a thermal vapor recompressor (TVR) that is configured to compress revaporized vapor generated in the first condensed water tank and supply the revaporized vapor to the reboiler.
11. The wet-type carbon dioxide capturing equipment of claim 10 , wherein a heat exchanger is mounted in the first condensed water tank, and the heat exchanger exchanges heat between the CO 2 gas removed of the condensed water in the second condensed water tank and the condensed water in the first condensed water tank.
12. The wet-type carbon dioxide capturing equipment of claim 11 , further comprising a third heat exchanger that is configured to exchange heat between the exhaust gas removed of the CO 2 in the CO 2 absorption tower and the CO 2 gas passing through the heat exchanger mounted in the first condensed water tank.