Wash water method and system for a carbon dioxide capture process

摘要

A system and method for recovering a solvent from a decarbonated flue gas in an absorption column, the decarbonated flue gas having had carbon dioxide absorbed and removed by vapor-liquid contact with a carbon dioxide absorbing solution containing the solvent. The system includes an emission control section configured to bring a water stream substantially free of the solvent into contact with the decarbonated flue gas to recover the solvent from the decarbonated flue gas and to form a solvent containing wash water and a reduced solvent containing flue gas and a flue gas cooling section configured to bring cooled wash water into contact with the reduced solvent containing flue gas to cool the reduced solvent containing flue gas and condense water from the decarbonated flue gas thereby forming a cooled flue gas and used wash water.

主权项

1. A method for recovering a solvent from a decarbonated flue gas in a water wash section of an absorption column, the decarbonated flue gas having had carbon dioxide absorbed and removed by vapor-liquid contact with a carbon dioxide absorbing solution containing the solvent in the absorption column, the method comprising:
bringing a water stream substantially free of the solvent into counter-current contact with the decarbonated flue gas in an emission control section of the absorption column to recover the solvent from the decarbonated flue gas to form a solvent containing wash water and a reduced solvent containing flue gas; and bringing a. cooled wash water into counter-current contact with the reduced solvent containing flue gas in a flue gas cooling section of the absorption column to cool the reduced solvent containing flue gas, thereby forming a cooled flue gas and a used wash water; and collecting the used wash water with a collection device disposed between the flue gas cooling section and the emission control section; removing the collected used wash water from the collection device; cooling at least a portion of the removed used wash water to form cooled wash water; and returning at least a portion of the cooled wash water to the flue gas cooling section.