Ultra cleaning of combustion gas including the removal of co2

Details Ultra cleaning of combustion gas including the removal of co2 Ultra cleaning of combustion gas including the removal of co2

B - Operations, Transporting

01

D

B01D 53/14 (2006.01)

Patent

CA 2574633

Ultra cleaning of combustion gas to near zero concentration of residual contaminants followed by the capture of CO2 is provided. The high removal efficiency of residual contaminants is accomplished by direct contact cooling and scrubbing of the gas with cold water. The temperature of the combustion gas is reduced to 0-20 degrees Celsius to achieve maximum condensation and gas cleaning effect. The CO2 is captured from the cooled and clean flue gas in a CO2 absorber (134) utilizing an ammoniated solution or slurry in the NH3-CO2- H2O system. The absorber operates at 0-20 degrees Celsius. Regeneration is accomplished by elevating the pressure and temperature of the CO2-rich solution from the absorber. The CO2 vapor pressure is high and a pressurized CO2 stream, with low concentration of NH3 and water vapor is generated. The high pressure CO2 stream is cooled and washed to recover the ammonia and moisture from the gas.

L~invention porte sur l~ultra nettoyage de gaz de combustion à la concentration proche de zéro des contaminants résiduels suivi de la capture de CO2. La grande efficacité d~enlèvement des contaminants résiduels fait appel au refroidissement par contact direct et au lavage du gaz à l~eau froide. La température du gaz de combustion est réduite à 0-20 degrés Celsius pour atteindre un effet maximal de condensation et de nettoyage de gaz. Le CO2 est capturé à partir du gaz d~échappement refroidi et propre dans un absorbeur de CO2 (134) utilisant une solution à l~ammoniac ou une boue dans le système NH3-CO2-H2O. L~absorbeur fonctionne à 0-20 degrés Celsius. La régénération consiste à élever la pression et la température de la solution riche en CO2 provenant de l~absorbeur. La pression de vapeur CO2 est élevée et l~on obtient un courant de CO2 sous pression, à faible concentration de NH3 et de vapeur d~eau. Le courant haute pression CO2 est refroidi et lavé pour récupérer l~ammoniac et l~humidité à partir du gaz.

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