CO2 recovery system and CO2 absorption liquid

A CO2 recovery system, comprising:

• an absorber for absorbing CO2 contained in a combustion exhaust gas of a fossil fuel into an absorption liquid by contacting the combustion exhaust gas and the absorption liquid;
• a regenerator for releasing CO2 by applying thermal energy to the CO2-absorbed absorption liquid;
• and
• a circulation device for circulating the absorption liquid between the absorber and the regenerator,
• wherein the absorption liquid has an aqueous solution of amine having an alcohol group and dimethyl silicone oil in which a part of a plurality of methyl groups is substituted by at least one type selected from an aminoalkyl group, a carboxyl group and a hydroxyl-containing alkyl group,
• wherein a ratio of the dimethyl silicone oil to a total amount of water and the dimethyl silicone oil in the absorption liquid is from 10 mass % to 50 mass %.