Ammonia capturing by CO;product liquid in water wash liquid

• US 9,162,177 B2
• Filed: 01/25/2012
• Issued: 10/20/2015
• Est. Priority Date: 01/25/2012
• Status: Expired due to Fees

• Current Assignee: General Electric Technology GmbH (GE Aerospace)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Balfe, Michael C., Hiwale, Rameshwar S., Naumovitz, Joseph P.
• Primary Examiner(s): Smith, Duane
• Assistant Examiner(s): SHAO, PHILLIP Y
• Application Number:
  US13/357,963
• Publication Number:
  US 20130186272A1
• Time in Patent Office: 1,364 Days
• Field of Search: None
• US Class Current: 1/1
• 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 (102) included in a chilled ammonia process, comprises:

• • providing CO₂ loaded liquid (122) comprising CO₂ dissolved in the liquid;
  • providing wash water liquid (108, 138);
  • combining the CO₂ loaded liquid with the wash water liquid to form CO₂ enriched wash water liquid (105, 106) before the liquid is added said water wash unit (102); and
  • bringing said combustion flue gas into contact with said CO₂ enriched wash water liquid by adding the CO₂ enriched wash water liquid to said water wash unit (102).

Claims

1. A gas purification system for capturing of ammonia (NH₃) from combustion flue gas by contact with CO₂ enriched wash water liquid containing dissolved carbon dioxide CO₂ in liquid form wherein the system comprises:

a water wash unit for capturing ammonia NH₃;

one or more wash water liquid ducts for recirculating wash water liquid;

one or more units generating CO₂ loaded liquid;

a CO₂ loaded liquid duct for the CO₂ loaded liquid to flow through to the wash water liquid duct from the one or more units for generating CO₂ loaded liquid to suppress the equilibrium vapor pressure of NH₃ over the wash water liquid; and

one or more CO₂ enriched wash water liquid ducts for the CO₂ enriched wash water liquid to flow through for integrating the CO₂ loaded liquid and the wash water liquid to the water wash unit for bringing the CO₂ enriched wash water liquid into contact with the combustion flue gas.

2. A gas purification system according to claim 1 wherein the units for generating CO₂ loaded liquid is a CO₂ product cooler and/or a CO₂ compressor system, working separately or together for generating CO₂ loaded liquid.

3. A gas purification system according to claim 1, wherein the wash water unit comprises at least one packed bed section.

4. The gas purification system according to claim 1, wherein the CO₂ enriched wash water liquid is introduced to the bottom section of the wash water unit by CO₂ enriched wash water liquid duct.

5. The gas purification system according to claim 1, wherein the CO₂ enriched wash water liquid is introduced to the upper section of the wash water unit by CO₂ enriched wash water liquid duct.

6. The gas purification system according to claim 1, further comprising at least one heat exchanger and wherein the wash water unit operates at a temperature of 1°

C. to 10°

C.

7. The gas purification system according to claim 1, wherein the carbon dioxide CO₂ in liquid form is reintroduced into the wash water liquid after separation and liquefaction in a CO₂ product cooler unit forming a CO₂ cooler CO₂ loaded wash water solution.

8. A gas purification system according to claim 1, wherein the carbon dioxide CO₂ in liquid form is reintroduced into the wash water liquid after separation and liquefaction in a CO₂ compressor system forming an interstage cooler water CO₂ rich condensate.

9. A gas purification system according to claim 1, wherein the carbon dioxide CO₂ in liquid form is reintroduced into the water wash unit after separation and liquefaction in a CO₂ product cooler unit in combination with a CO₂ compressor system.

10. A gas purification system for capturing of ammonia (NH₃) from combustion flue gas by contact with a CO₂ enriched wash water liquid containing dissolved carbon dioxide CO₂ in liquid form wherein the system comprises:

a water wash unit for capturing ammonia the unit comprising at least first and second stages;

at least one or more wash water liquid ducts for providing a wash water liquid;

at least one or more units for generating a CO₂ loaded liquid;

at least one or more CO₂ loaded liquid ducts for fluidly connecting the units for generating the CO₂ loaded liquid to the wash water liquid ducts and to form the CO₂ enriched wash water liquid; and

wherein the first and second stages further comprise at least one or more ducts for receiving the CO₂ enriched wash water liquid and bring the CO₂ enriched wash water liquid into contact with the combustion flue gas.