Co2 recovery device and co2 recovery method

A CO2 recovery device comprising:

• a CO2 absorption column that brings a CO2-containing flue gas containing CO2 into contact with a CO2 absorption liquid and removes CO2;
• and
• an absorption liquid regeneration column that regenerates the CO2 absorption liquid that has absorbed the CO2,
• wherein a lean solution, from which CO2 has been removed in the absorption liquid regeneration column, is reused in the CO2 absorption column,
• the CO2 absorption column includes
• a CO2 absorption section that absorbs CO2 in the CO2-containing flue gas with the CO2 absorption liquid,
• a main rinse section that is provided on a gas flow downstream side of the CO2 absorption section, cools flue gas after CO2 removal with rinse water, and recovers an entrained CO2 absorbent with the rinse water,
• a rinse water circulation line that supplies and circulates the rinse water containing the CO2 absorbent recovered in a liquid storage section of the main rinse section from a top part side of the main rinse section,
• a pre-rinse section that is provided between the CO2 absorption section and the main rinse section,
• a rinse section extraction liquid supply line that extracts a portion of the rinse water containing the CO2 absorbent from the rinse water circulation line, is connected to a top part side of a reflux section, of the absorption liquid regeneration column, and introduces the portion of the rinse water into the reflux section, and
• a refluxed water supply line that extracts a portion of refluxed water from a side closer to a column bottom part than an introduction position of the reflux section, is connected to the pre-rinse section side, and introduces the portion of the refluxed water as pre-rinse water of the pre-rinse section.