Verfahren zur Beseitigung von Kohlendioxyd aus Abgasen

摘要

A process for removing CO2 from a combustion gas which comprises removing CO2 from the combustion gas through contact of an aqueous hindered amine solution used as a CO2 absorbent solution with the combustion gas at atmospheric pressure and then, in a regeneration column, liberating CO2 from the absorbent solution that has absorbed CO2 by heating it and thereby regenerating the absorbent solution. The process further comprises a partial absorbent solution regeneration step in at least one stage wherein the absorbent solution that has absorbed CO2 is heated through heat exchange with a high-temperature regenerated absorbent solution and part of the CO2 that is liberated is separated from the absorbent solution. Following this, according to the necessity, part of the partially regenerated absorbent solution thus obtained is returned to the step of removing CO2 from the combustion gas for use as part of the CO2 absorbent solution while the rest or all of the absorbent solution is heated and fed to a regeneration column further to liberate CO2 and regenerate the absorbent solution.