Co2 recovery unit and co2 recovery method

Patent metadata

Field	Value
Publication number	US-2016361682-A1
Application number	US-201415119023-A
Country	US
Kind code	A1
Filing date	Oct 7, 2014
Priority date	Feb 17, 2014
Publication date	Dec 15, 2016
Grant date	—

Abstract

A CO 2 recovery unit and a CO 2 recovery method capable of having an excellent CO 2 absorption rate and saving energy are provided. A CO 2 recovery unit of the invention includes: a CO 2 absorber which includes an upper CO 2 absorption unit obtaining a CO 2 absorbent by causing a flue gas containing CO 2 to contact a CO 2 absorbent and a lower CO 2 absorption unit obtaining a CO 2 absorbent by causing the CO 2 absorbent to contact a flue gas containing CO 2 ; a CO 2 absorbent regenerator which obtains the CO 2 absorbent by heating the CO 2 absorbent a thermometer which measures a temperature of the CO 2 absorbent supplied from the CO 2 absorber to the CO 2 absorbent regenerator; and a control device which controls a temperature of the CO 2 absorbent supplied to the lower CO 2 absorption unit based on the temperature of the CO 2 absorbent measured by the thermometer.

First claim

1 . A CO 2 recovery unit comprising:
a CO 2 absorber which includes a first CO 2 absorption unit obtaining a first CO 2 absorbent by causing a CO 2 containing gas to be treated to contact a CO 2 absorbent so that CO 2 contained in the gas to be treated is absorbed to the CO 2 absorbent and a second CO 2 absorption unit obtaining a second CO 2 absorbent by causing the first CO 2 absorbent to contact a CO 2 containing gas to be treated so that CO 2 contained in the gas to be treated is absorbed to the first CO 2 absorbent; a CO 2 absorbent regenerator which regenerates a CO 2 absorbent by heating the second CO 2 absorbent so that CO 2 is discharged from the second CO 2 absorbent; a temperature measurement device which measures a temperature of the second CO 2 absorbent supplied from the CO 2 absorber to the CO 2 absorbent regenerator; and a control device which controls a temperature of the first CO 2 absorbent supplied to the second CO 2 absorption unit based on the temperature of the second CO 2 absorbent measured by the temperature measurement device.

2 . The CO 2 recovery unit according to claim 1 ,
wherein the control device controls the temperature of the first CO 2 absorbent supplied to the second CO 2 absorption unit so that the temperature is equal to or higher than 50° C. and equal to or lower than 60° C.

3 . The CO 2 recovery unit according to claim 1 ,
wherein a CO 2 partial pressure of the CO 2 containing gas to be treated is 50 kPa or more.

4 . The CO 2 recovery unit according to claim 1 ,
wherein a ratio (the first CO 2 absorption unit:the second CO 2 absorption unit) between a filling material charging height in the first CO 2 absorption unit and a filling material charging height in the second CO 2 absorption unit is equal to or larger than 1:3 and equal to or smaller than 3:1.

5 . A CO 2 recovery method comprising:
obtaining a first CO 2 absorbent by causing a CO 2 containing gas to be treated to contact a CO 2 absorbent in a first CO 2 absorption unit of a CO 2 absorber so that CO 2 contained in the gas to be treated is absorbed to the CO 2 absorbent and obtaining a second CO 2 absorbent by causing the first CO 2 absorbent to contact the CO 2 containing gas to be treated in a second CO 2 absorption unit of the CO 2 absorber so that CO 2 contained in the gas to be treated is absorbed to the first CO 2 absorbent; regenerating a CO 2 absorbent by heating the second CO 2 absorbent in a CO 2 absorbent regenerator so that CO 2 is discharged from the CO 2 absorbent; and measuring a temperature of the second CO 2 absorbent supplied from the CO 2 absorber to the CO 2 absorbent regenerator and controlling a temperature of the first CO 2 absorbent supplied to the second CO 2 absorption unit based on the measured temperature of the second CO 2 absorbent.

6 . The CO 2 recovery method according to claim 5 ,
wherein the temperature of the first CO 2 absorbent supplied to the second CO 2 absorption unit is controlled so that the temperature is equal to or higher than 50° C. and equal to or lower than 60° C.

7 . The CO 2 recovery method according to claim 5 ,
wherein a CO 2 partial pressure of the CO 2 containing gas to be treated is 50 kPa or more.

8 . The CO 2 recovery method according to claim 5 ,
wherein a ratio (the first CO 2 absorption unit:the second CO 2 absorption unit) between a filling material charging height in the first CO 2 absorption unit and a filling material charging height in the second CO 2 absorption unit is equal to or larger than 1:3 and equal to or smaller than 3:1.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Yukumoto Atsuhiro
• Hirata Takuya
• Tanaka Hiroshi
• Hagimoto Akiyori
• Hirayama Haruaki
• Oishi Tsuyoshi

Classifications

• B01D2258/0283

  Flue gases · CPC title

• B01D53/1406 Primary

  Multiple stage absorption · CPC title

• B01D53/1425

  Regeneration of liquid absorbents · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title

• B01D53/1412 Primary

  Controlling the absorption process · CPC title