CO₂ desorption without stripper

摘要

A CO2 desorption method and equipment for performing this method is described. More specific, a method for desorbing CO2 from an absorption fluid without involving a traditional stripper but instead using a heat exchanger as a flash-tank is disclosed. Further described is the utilization of cooling heat from a condenser for cooling the lean absorbent fluid.

主权项

1. A method for desorbing carbon dioxide from a CO2 rich absorption fluid comprising a CO2 absorbent, a solvent and absorbed CO2, the method comprising:
heating the CO2 rich absorption fluid, expanding the heated CO2 rich absorption fluid in a flash tank,
separating the expanded absorption fluid in a vapour phase comprising desorbed CO2 and vaporised solvent and a main liquid phase comprising CO2 lean absorption fluid,condensing at least part of the solvent within the vapour phase,
recycling a part of the main liquid phase which has left the flash tank into the CO2 rich absorption fluid which is about to enter the flash tank, and thenmixing the condensed solvent with the rest of the main liquid phase comprising CO2 lean absorption fluid from the flash tank to obtain a cooled CO2 lean absorption fluid which is all recirculated back to a CO2 absorption unit for use as a CO2 absorbent in said absorption unit.