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Reabsorber for ammonia stripper offgas

  • US 8,764,892 B2
  • Filed: 02/25/2013
  • Issued: 07/01/2014
  • Est. Priority Date: 11/04/2008
  • Status: Active Grant
First Claim
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1. 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;

    said CO2 absorption stage comprising a first 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;

    a first absorption liquid regenerator unit; and

    an absorption liquid cycle;

    wherein the first gas liquid mass transfer device and the first absorption liquid regenerator unit are in fluid connection via the absorption liquid cycle such that at least a portion of CO2 rich absorption liquid from the first gas liquid mass transfer device may be directed to the first absorption liquid regenerator unit, and at least a portion of the CO2 lean absorption liquid from the first absorption liquid regenerator unit may be recycled to the first gas liquid mass transfer device;

    said NH3 absorption stage comprising a second 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 third 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.

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