Removal of carbon dioxide from flue gas with ammonia comprising medium
View Patent ↗A process of removal of CO 2 from a flue gas ( 2 ). The process comprises the steps of: a) providing a flue gas comprising CO 2 ( 2 ), b) contacting the flue gas of step (a) with an ammonia-comprising medium ( 9 ), to absorb CO 2 from said flue gas; and c) condensing ammonia ( 4 ) present in the flue gas leaving step (b), to remove ammonia from said flue gas. A system for removal of CO 2 from a flue gas. A system for removal of CO 2 from a flue gas. The system comprises a CO 2 absorber ( 1 ) receiving the flue gas ( 2 ) and comprising an ammonia-comprising medium ( 9 ). The system further comprises an ammonia condenser ( 4 ) receiving flue gas ( 3 ) leaving the CO 2 absorber.
1. A method for removing CO 2 from a contaminated gas stream, the method comprising:
absorbing CO 2 from a gas stream using an ammonia comprising medium in a pressurized absorber to produce a gas stream depleted of CO 2 and an ammonia comprising medium with absorbed CO 2 , the absorbing being performed at an elevated pressure sufficient to decrease the partial pressure the ammonia and increase the solubility of the CO 2 and at a temperature greater than 20° C.;
regenerating the ammonia comprising medium with absorbed CO 2 within a pressurized regenerator to separate CO 2 from the ammonia comprising medium, the regenerating being performed at a pressure greater than 10 bar gauge; and
condensing ammonia present in the gas stream depleted of CO 2 ; and wherein the condensing is performed at a pressure between 0 bar gauge and 10 bar gauge.
2. The method of claim 1 , wherein the absorbing is performed at a temperature between 20° C. and 80° C.
3. The method of claim 1 , wherein the regenerating is performed at a temperature between 100° C. and 200° C.
4. A method for removing CO 2 from a contaminated gas stream, the method comprising:
absorbing CO 2 from a gas stream using an ammonia comprising medium in a pressurized absorber to produce a gas stream depleted of CO 2 and an ammonia comprising medium with absorbed CO 2 , the absorbing being performed at a pressure sufficient to decrease the partial pressure the ammonia and increase the solubility of the CO 2 ;
regenerating the ammonia comprising medium with absorbed CO 2 within a pressurized regenerator to separate CO 2 from the ammonia comprising medium, the regenerating being performed at a pressure greater than 10 bar gauge; and
condensing ammonia present in the gas stream depleted of CO 2 at a pressure between 0 bar gauge and 10 bar gauge.
5. The method of claim 4 , wherein the condensing is performed at a temperature between 0° C. and 5° C.
6. The method of claim 1 , wherein the ammonia comprising medium includes a carbonate or bicarbonate of ammonia in a solution or slurry.
7. The method of claim 1 , further comprising:
returning ammonia condensed from the gas stream depleted of CO 2 to the absorber.
8. The method of claim 4 , further comprising:
cooling the gas stream before the absorbing, and wherein the absorbing is performed at a temperature less than 16° C.
9. The method of claim 4 , wherein the regenerating is performed at a temperature between 100° C. and 200° C.
10. A method for removing CO2 from a contaminated gas stream, the method comprising:
absorbing CO2 from a gas stream using an ammonia comprising medium in a pressurized absorber to produce a gas stream depleted of CO2 and an ammonia comprising medium with absorbed CO2, the absorbing being performed at an elevated pressure sufficient to decrease the partial pressure the ammonia and increase the solubility of the CO2 and at a temperature greater than 20° C.;
regenerating the ammonia comprising medium with absorbed CO2 within a pressurized regenerator to separate CO2 from the ammonia comprising medium, the regenerating being performed at a pressure greater than 10 bar gauge; and
condensing ammonia present in the gas stream depleted of CO2; wherein the condensing is performed at a pressure between 0 bar gauge and 10 bar gauge; and wherein the condensing is performed at a temperature between 0° C. and 5° C.
11. The method of claim 10 , wherein the ammonia comprising medium includes a carbonate or bicarbonate of ammonia in a solution or slurry.
12. The method of claim 10 , further comprising:
returning ammonia condensed from the gas stream depleted of CO 2 to the absorber.
13. The method of claim 1 , wherein the absorbing is performed at a pressure between 5 bar gauge and 10 bar gauge.
14. The method of claim 1 , wherein the absorbing is performed at a temperature greater than 30° C.
15. The method of claim 4 , wherein the absorbing is performed at a temperature greater than 30° C.