# US 10,864,478 B2 · Carbon dioxide capture system and a method of operating a carbon dioxide capture system

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- Number: US 10,864,478 B2
- Document ID: US10864478B2
- Status: Granted
- Kind: B2
- Application number: 15/341,538
- Filed: 2016-11-02
- Published: 2017-06-15
- Granted: 2020-12-15
- Earliest claimed: 2015-12-14
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Koshito Fujita; Mitsuru Udatsu
- Web page: https://patentgrep.com/patent/US10864478B2

## CPC

- B01D 53/18: Absorbing units; Liquid distributors therefor (B01D3/16, B01D3/26, B01D3/30 take precedence; packing elements B01J19/30, B01J19/32)
- B01D 53/1406: {Multiple stage absorption}
- B01D 53/1412: {Controlling the absorption process}
- B01D 53/1475: {Removing carbon dioxide}
- B01D 2252/204: Amines
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02C 20/40: of CO2
- Y02P 20/151: Reduction of greenhouse gas [GHG] emissions, e.g. CO2
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A carbon dioxide capture system includes a first capture system and a second capture system. The first capture system including a first absorber that causes carbon dioxide contained in a combustion exhaust gas to be absorbed in a first absorbing liquid. The second capture system causes carbon dioxide contained in a combustion exhaust gas to be absorbed in a second absorbing liquid. The second rich liquid releases carbon dioxide at a lower temperature than the first rich liquid.

## Claims

### Claim 1

A carbon dioxide capture system comprising:
a first capture system including
a first absorber configured to cause carbon dioxide contained in a combustion exhaust gas to be absorbed in a first absorbing liquid to produce a first rich liquid, and
a first stripper configured to cause the carbon dioxide to be released from the first rich liquid produced by the first absorber;
a second capture system, provided in parallel with the first capture system, including
a second absorber configured to cause carbon dioxide contained in a combustion exhaust gas to be absorbed in a second absorbing liquid to produce a second rich liquid, and
a second stripper configured to cause the carbon dioxide to be released from the second rich liquid produced by the second absorber;
a line separately supplying the combustion exhaust gas into the first absorber of the first capture system and the second absorber of the second capture system,
a maintenance bulb controlling the pressure in the first stripper,
a compressor compressing the carbon dioxide from the first and the second stripper, and
an exhaust line connecting the first stripper and the second stripper to the compressor,
wherein a temperature at which the second rich liquid releases carbon dioxide is lower than a temperature at which the first rich liquid releases carbon dioxide,
wherein the exhaust line includes a first exhaust line extending from the first stripper, a second exhaust line extending from the second stripper, and a connecting point connecting the first exhaust line and the second exhaust line,
wherein the maintenance bulb is provided on the first exhaust line, and
wherein the opening of the maintenance bulb is adjusted so that the pressure in the first stripper is higher than the pressure in the second stripper.

### Claim 2 (depends on 1)

The carbon dioxide capture system according to claim 1, further comprising:
a first reboiler that heats the first absorbing liquid by a first heating medium and discharging the first heating medium as a first discharged heating medium; and
a second reboiler that heats the second absorbing liquid by the first discharged heating medium discharged from the first reboiler.

### Claim 3 (depends on 2)

The carbon dioxide capture system according to claim 2, further comprising:
a flashing device that flashes the first discharged heating medium discharged from the first reboiler and supplied to the second reboiler.

### Claim 4 (depends on 2)

The carbon dioxide capture system according to claim 2,
wherein the second reboiler heats the second absorbing liquid by the first discharged heating medium, and
the carbon dioxide capture system further comprises:
a third reboiler that heats the first discharged heating medium that heats the second reboiler.