Chilled ammonia based CO2 capture system with water wash system
First Claim
1. A method of reducing an amount of ammonia in a CO2 lean flue gas stream resulting from an ammonia-based CO2 capture system, the method comprising:
- contacting a flue gas stream with an ammoniated slurry or solution within an absorption tower, wherein the ammoniated slurry or solution removes carbon dioxide (CO2) from the cooled flue gas stream thereby forming an ammonia-containing flue gas stream; and
introducing at least a portion of the ammonia-containing flue gas stream from the absorption tower to a wash vessel, the wash vessel having first and second absorption stages to absorb ammonia from the ammonia-containing flue gas stream thereby reducing an amount of ammonia in a flue gas stream exiting the wash vessel, each of the first and second absorption stages including a mass transfer device and a liquid delivery path;
introducing a first liquid to the liquid delivery path of the first absorption stage such that the first liquid flows in a direction countercurrent to the ammonia-containing flue gas stream to contact the ammonia-containing flue gas stream and the mass transfer devices of the first and second absorption stages;
introducing a second liquid having a different ammonia content than the first liquid to the liquid delivery path of the second absorption stage such that the second liquid flows in a direction countercurrent to the ammonia-containing flue gas stream to contact the ammonia-containing flue gas stream and the mass transfer device of the second absorption stage, whereby the first and second liquids absorb ammonia from the ammonia-containing flue gas stream.
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Accused Products
Abstract
A method and system for reducing an amount of ammonia in a flue gas stream. The system 100 includes: a wash vessel 180 for receiving an ammonia-containing flue gas stream 170, the wash vessel 180 including a first absorption stage 181a and a second absorption stage 181b, each of the first absorption stage 181a and the second absorption stage 181b having a mass transfer device 184; and a liquid 187 introduced to the wash vessel 180, the liquid 187 for absorbing ammonia from the ammonia-containing flue gas stream 170 thereby forming an ammonia-rich liquid 192 and a reduced ammonia containing flue gas stream 190 exiting the wash vessel 180.
75 Citations
12 Claims
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1. A method of reducing an amount of ammonia in a CO2 lean flue gas stream resulting from an ammonia-based CO2 capture system, the method comprising:
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contacting a flue gas stream with an ammoniated slurry or solution within an absorption tower, wherein the ammoniated slurry or solution removes carbon dioxide (CO2) from the cooled flue gas stream thereby forming an ammonia-containing flue gas stream; and introducing at least a portion of the ammonia-containing flue gas stream from the absorption tower to a wash vessel, the wash vessel having first and second absorption stages to absorb ammonia from the ammonia-containing flue gas stream thereby reducing an amount of ammonia in a flue gas stream exiting the wash vessel, each of the first and second absorption stages including a mass transfer device and a liquid delivery path; introducing a first liquid to the liquid delivery path of the first absorption stage such that the first liquid flows in a direction countercurrent to the ammonia-containing flue gas stream to contact the ammonia-containing flue gas stream and the mass transfer devices of the first and second absorption stages; introducing a second liquid having a different ammonia content than the first liquid to the liquid delivery path of the second absorption stage such that the second liquid flows in a direction countercurrent to the ammonia-containing flue gas stream to contact the ammonia-containing flue gas stream and the mass transfer device of the second absorption stage, whereby the first and second liquids absorb ammonia from the ammonia-containing flue gas stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification