REABSORBER FOR AMMONIA STRIPPER OFFGAS
First Claim
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1. Method for removal of CO2 from a flue gas stream, comprising the steps of:
- a) contacting a flue gas stream comprising CO2 with a first absorption liquid comprising NH3 such that the flue gas stream is depleted in CO2;
b) contacting the flue gas stream depleted in CO2 of step a) with a second absorption liquid such that NH3 from the flue gas stream is absorbed in said second absorption liquid to form a flue gas stream depleted in CO2 and NH3;
c) separating NH3 from the second absorption liquid such that a gas stream comprising NH3 is obtained;
d) contacting said gas stream comprising NH3 separated in step c) with a third absorption liquid such that NH3 is absorbed in said third absorption liquid.
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Abstract
A method for removal of CO2 from a flue gas stream, comprising the steps of:
- a) contacting a flue gas stream comprising CO2 with a first absorption liquid comprising NH3 such that the flue gas stream is depleted in CO2; b) contacting the flue gas stream depleted in CO2 of step a) with a second absorption liquid such that NH3 from the flue gas stream is absorbed in said second absorption liquid to form a flue gas stream depleted in CO2 and NH3;
- c) separating NH3 from the second absorption liquid such that a gas stream comprising NH3 is obtained; d) contacting said gas stream comprising NH3 separated in step c) with a third absorption liquid such that NH3 is absorbed in said third absorption liquid. A system for removal of CO2 from a flue gas stream, the system comprising: a CO2 absorption stage; an NH3 absorption stage; and a reabsorption stage.
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Citations
25 Claims
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1. Method for removal of CO2 from a flue gas stream, comprising the steps of:
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a) contacting a flue gas stream comprising CO2 with a first absorption liquid comprising NH3 such that the flue gas stream is depleted in CO2; b) contacting the flue gas stream depleted in CO2 of step a) with a second absorption liquid such that NH3 from the flue gas stream is absorbed in said second absorption liquid to form a flue gas stream depleted in CO2 and NH3; c) separating NH3 from the second absorption liquid such that a gas stream comprising NH3 is obtained; d) contacting said gas stream comprising NH3 separated in step c) with a third absorption liquid such that NH3 is absorbed in said third absorption liquid. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. In an embodiment, step a) is performed in a first gas liquid mass transfer device, step b) is performed in a second gas liquid mass transfer device and step d) is performed in a third gas liquid mass transfer device, wherein said first and third gas liquid mass transfer devices are separated from each other.
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11. A system for removal of CO2 from a flue gas stream, the system comprising:
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a CO2 absorption stage; an NH3 absorption stage; and a reabsorption stage; said CO2 absorption stage comprising a gas liquid mass transfer device configured to receive a flue gas stream containing CO2, contact the flue gas stream with a first absorption liquid comprising NH3 such that CO2 from the flue gas stream is absorbed in the first absorption liquid and discharge a flue gas stream depleted in CO2; said NH3 absorption stage comprising a gas liquid mass transfer device configured to receive a flue gas stream depleted in CO2 from the CO2 absorption stage and contact said flue gas stream depleted in CO2 with a second absorption liquid such that NH3 from the flue gas stream is absorbed in said second absorption liquid, and a second absorption liquid regenerator unit configured to separate NH3 from the second absorption liquid and discharge a gas stream comprising NH3 in gas or vapor form; and said reabsorption stage comprising a gas liquid mass transfer device configured to receive a gas stream comprising NH3 discharged from the second absorption liquid regenerator unit and contact said gas stream comprising NH3 with a third absorption liquid such that NH3 is absorbed in said third absorption liquid. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification