Wet-type carbon dioxide capturing equipment

Patent metadata

Field	Value
Publication number	US-10322366-B2
Application number	US-201715638490-A
Country	US
Kind code	B2
Filing date	Jun 30, 2017
Priority date	Sep 20, 2016
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

Wet-type carbon dioxide capturing equipment includes a CO2 absorption tower where CO2 of an exhaust gas reacts with an absorbent, a CO2 stripping tower where CO2 is separated from a rich solution absorbed the CO2 in the CO2 absorption tower, a reboiler for supplying thermal energy to the CO2 stripping tower to separate the CO2 from the rich solution in the CO2 stripping tower, a first heat exchanger for heating the rich solution by exchanging heat between a lean solution having the CO2 separated therefrom in the CO2 stripping tower and the rich solution, a mechanical vapor recompressor (MVR) for compressing a CO2 gas separated in the CO2 stripping tower, and a second heat exchanger for separating a portion of CO2 from the rich solution by heating the rich solution by exchanging heat between the CO2 gas compressed in the MVR and the rich solution passing through the first heat exchanger, in which the rich solution having CO2 that is not separated in the second heat exchanger is input to the CO2 stripping tower where the CO2 is separated.

First claim

What is claimed is:

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.

Assignees

• Kepco Eng & Constr Co Inc

Inventors

• Lee Young Ill
• Lim Tea Young
• Cho Seong Pill
• Choi Eun Kyu
• Yoon Sung Mun

Classifications

• B01D2257/504

  Carbon dioxide · CPC title

• Y02E20/326

  Cross-Sectional Technologies · mapped topic

• B01D53/1425

  Regeneration of liquid absorbents · CPC title

• F23J2215/50

  Carbon dioxide · CPC title

• F23J15/02

  of purifiers, e.g. for removing noxious material (traps for solid residues F23J3/04) · CPC title