Ammonia capturing by CO2 product liquid in water wash liquid

• US 9,687,774 B2
• Filed: 09/15/2015
• Issued: 06/27/2017
• Est. Priority Date: 01/25/2012
• Status: Active Grant

• Current Assignee: General Electric Technology GmbH (GE Vernova, Inc.)
• Original Assignee: General Electric Technology GmbH (GE Vernova, Inc.)
• Inventors: Balfe, Michael Charles, Hiwale, Rameshwar Shamrao, Naumovitz, Joseph Paul
• Primary Examiner(s): Orlando, Amber R
• Assistant Examiner(s): SHAO, PHILLIP Y
• Application Number:
  US14/854,515
• Publication Number:
  US 20160051925A1
• Time in Patent Office: 651 Days
• Field of Search: None
• CPC Class Codes: B01D 2252/102 Ammonia
• CPC Class Codes: B01D 2252/103 Water
• CPC Class Codes: B01D 2257/406 Ammonia
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 2258/025 from metallurgy plants
• CPC Class Codes: B01D 2258/0283 Flue gases
• CPC Class Codes: B01D 2258/0291 from waste incineration plants
• CPC Class Codes: B01D 53/14 by absorption
• CPC Class Codes: B01D 53/1406 Multiple stage absorption
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/58 Ammonia
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

A method for capturing ammonia present in combustion flue gas subjected to carbon dioxide removal using a water wash unit included in a chilled ammonia process. The method includes combining a CO₂ loaded liquid and a wash water liquid to form a CO₂ enriched wash water liquid that is then brought into contact with the combustion flue gas.

Claims

1. A method for capturing ammonia present in combustion flue gas subjected to CO₂ removal, using a water wash unit that comprises at least first and second stages included in a chilled ammonia process, comprising the steps of:

providing CO₂ loaded liquid comprising CO₂ dissolved in the liquid;

providing wash water liquid;

combining the CO₂ loaded liquid with the wash water liquid to form a CO₂ enriched wash water liquid

providing the CO₂ enriched wash water liquid at each of the first and second stages of the water wash unit;

bringing the combustion flue gas into contact with the CO₂ enriched wash water liquid by adding the CO₂ enriched wash water liquid to said water wash; and

forming a reduced ammonia flue gas stream and a used wash water stream.

2. The method according to claim 1, wherein the concentration of ammonia in the CO₂ enriched wash water liquid added to the first stage is 0.5 to 3 mol/liter.

3. The method according to claim 1, wherein the wash water liquid comprises 0.0005 mol/l to 0.2 mol/l ammonia (NH₃) before it is combined with the CO₂ loaded liquid.

4. The method according to claim 1, wherein the wash water unit operates at 1°

C. to 10°

C.

5. The method according to claim 1, wherein the ratio of moles of ammonia (NH₃) to moles of carbon dioxide (CO₂) for the CO₂ enriched wash water liquid is kept at about 0.05 to 10.

8. The method according to claim 5, wherein the ratio of moles of ammonia (NH₃) to moles of carbon dioxide (CO₂) for the CO₂ enriched wash water liquid is kept at about 0.1 to 5.

9. The method according to claim 5 wherein the ratio of moles of ammonia (NH₃) to moles of carbon dioxide (CO₂) for the CO₂ enriched wash water liquid is kept at about 1 to 4.

14. The method according to claim 1, wherein the concentration of ammonia in the CO₂ enriched wash water liquid added to the second stage is 0.005 to 0.2 mol/liter.

15. The method according to claim 3, wherein the concentration of ammonia in the wash water entering the second stage is lower than the concentration of ammonia entering the first stage.

6. A method for capturing ammonia present in combustion flue gas subjected to CO₂ removal, using a water wash unit that comprises at least first and second stages included in a chilled ammonia process, comprising:

providing CO₂ loaded liquid comprising CO₂ dissolved in the liquid;

providing wash water liquid;

combining the CO₂ loaded liquid with the wash water liquid to form a CO₂ enriched wash water liquid;

providing the CO₂ enriched wash water liquid to the water wash unit; and

bringing said combustion flue gas into contact with said CO₂ enriched wash water liquid to form a cleaned flue gas stream and a used wash liquid.

7. The method of claim 6, further comprising:

providing a portion of the CO₂ enriched wash water liquid to the water wash unit to each of the first and second stages.

10. A method for capturing ammonia present in combustion flue gas subjected to CO₂ removal, using a water wash unit that comprises at least first and second stages, the method comprising:

providing a CO₂ loaded liquid comprising CO₂ dissolved in the liquid;

providing wash water liquid;

combining the CO₂ loaded liquid with the wash water liquid to form CO₂ enriched wash water liquid;

providing the CO₂ enriched wash water liquid to the water wash unit to each of the at least first and second stages;

bringing said combustion flue gas into contact with said CO₂ enriched wash water liquid to form a reduced ammonia flue gas stream and a used wash water stream;

wherein the concentration of ammonia in the CO₂ enriched wash water liquid added to the first stage is 0.5 to 3 mol/liter; and

wherein the concentration of ammonia in the CO₂ enriched wash water liquid added to the second stage is 0.005 to 0.2 mol/liter.

11. The method according to claim 10, wherein the wash water liquid comprises 0.0005 mol/l to 0.2 mol/l ammonia (NH₃) before it is combined with the CO₂ loaded liquid.

12. The method according to claim 10, wherein the wash water unit operates at 1°

C. to 10°

C.

13. The method according to claim 10, wherein the ratio of moles of ammonia to moles of carbon dioxide for the CO₂ enriched wash water liquid is kept at about 0.05 to 10.