초록 ▼

A method for processing flue-gas, in an exemplary embodiment, includes providing an absorber unit having a membrane contactor, channeling a combustion flue gas along a first surface of the membrane contactor, and channeling an ammonia-based liquid reagent along a second opposing surface of the membr

A method for processing flue-gas, in an exemplary embodiment, includes providing an absorber unit having a membrane contactor, channeling a combustion flue gas along a first surface of the membrane contactor, and channeling an ammonia-based liquid reagent along a second opposing surface of the membrane contactor. The method also includes partially separating the ammonia-based liquid from the flue gas such that the ammonia-based liquid and the flue gas contact at gas-liquid interface areas, defined by a plurality of pores of the membrane contactor, to separate CO2 from the flue gas by a chemical absorption of CO2 within the ammonia-based liquid to produce a CO2-rich ammonia-based liquid.

대표청구항 ▼

1. A method for processing flue-gas that contains carbon dioxide (CO2), said method comprising: providing an absorber unit having a membrane contactor that has a surface area of about 10 to about 100 m2/gr and a void volume of about 90% to about 95%;channeling a combustion flue gas along a first sur

1. A method for processing flue-gas that contains carbon dioxide (CO2), said method comprising: providing an absorber unit having a membrane contactor that has a surface area of about 10 to about 100 m2/gr and a void volume of about 90% to about 95%;channeling a combustion flue gas along a first surface of the membrane contactor;channeling an ammonia-based liquid reagent along a second opposing surface of the membrane contactor;coupling a desorber unit in flow communication with the absorber unit to receive carbon dioxide (CO2)-laden ammonia-based liquid reagent from the absorber unit; andchanneling lean ammonia-based liquid reagent discharged from the desorber unit through a steam generator coupled in flow communication between the desorber unit and the absorber unit. 2. A method in accordance with claim 1 further comprising coupling a desorber unit to the absorber unit. 3. A method in accordance with claim 2 further comprising channeling the CO2-rich ammonia-based liquid to the desorber unit. 4. A method in accordance with claim 3 further comprising heating the CO2-rich ammonia-based liquid to release CO2 from the CO2-rich ammonia-based liquid. 5. A method in accordance with claim 1 wherein providing an absorber unit having a membrane contactor comprises providing an absorber unit having a hydrophobic membrane contactor. 6. A method in accordance with claim 1 wherein providing an absorber unit having a membrane contactor comprises providing an absorber unit having an expanded polytetrafluoroethylene membrane contactor. 7. A combustion system comprising: an absorber unit comprising: a housing for channeling a combustion flue gas that contains carbon dioxide (CO2);an ammonia-based liquid reagent channeled within said housing;a membrane contactor positioned within said housing, wherein said membrane contactor comprises a first surface, a second opposing surface, and a plurality of pores defining gas-liquid interface areas and having a surface area of about 10 to about 100 m2/gr and a void volume of about 90% to about 95%, the combustion flue gas is channeled along said first surface and said ammonia-based liquid reagent is channeled along said second opposing surface; anda desorber unit coupled to said absorber unit, wherein said desorber unit receives and releases CO2 from the CO2-rich ammonia-based liquid; anda steam generator coupled between said desorber unit and said absorber unit, such that lean ammonia-based liquid reagent discharged from the desorber unit is channeled through said steam generator prior to entering said absorber unit. 8. A combustion system in accordance with claim 7 wherein said membrane contactor comprises a hydrophobic material. 9. A combustion system in accordance with claim 7 wherein said membrane contactor comprises an expanded polytetrafluoroethylene material. 10. A combustion system in accordance with claim 7 wherein said membrane contactor comprises a plurality of hollow fibers. 11. A combustion system in accordance with claim 10 wherein said plurality of hollow fibers is packaged in a tube-and-shell arrangement. 12. A combustion system in accordance with claim 7 wherein said membrane contactor comprises a substantially planar sheet. 13. A combustion system in accordance with claim 12 wherein said substantially planar sheet is packaged as a spiral-wound module. 14. A flue-gas processing system comprising: a housing for channeling a combustion flue gas that contains carbon dioxide (CO2);an ammonia-based liquid reagent channeled within said housing; anda membrane contactor positioned within said housing, wherein said membrane contactor comprises a first surface, a second opposing surface, and a plurality of pores defining gas-liquid interface areas, said membrane contactor having a surface area of about 10 to about 100 m2/gr and a void volume of about 90% to about 95%, the combustion flue gas is channeled along said first surface and said ammonia-based liquid reagent is channeled along said second opposing surface;a desorber unit coupled to said housing for receiving carbon dioxide (CO2)-laden ammonia-based liquid reagent from said housing; anda steam generator coupled in flow communication with said desorber unit, for receiving a lean ammonia-based liquid reagent discharged from said desorber unit and for channeling the lean ammonia-based liquid reagent to said housing. 15. A flue-gas processing system in accordance with claim 14 wherein said membrane contactor comprises a hydrophobic material. 16. A flue-gas processing system in accordance with claim 14 wherein said membrane contactor comprises an expanded polytetrafluoroethylene material. 17. A flue-gas processing system in accordance with claim 14 wherein said membrane contactor comprises a plurality of hollow fibers. 18. A flue-gas processing system in accordance with claim 17 wherein said plurality of hollow fibers is packaged in a tube-and-shell arrangement. 19. A flue-gas processing system in accordance with claim 14 wherein said membrane contactor comprises a substantially planar sheet. 20. A flue-gas processing system in accordance with claim 19 wherein said substantially planar sheet is packaged as a spiral-wound module.