GAS TURBINE PLANT AND EXHAUST CARBON DIOXIDE RECOVERY METHOD THEREFOR

A gas turbine plant includes an exhaust line (L1), a carbon dioxide recovery device (3) configured to recover carbon dioxide contained in an exhaust gas, a circulation line (L2) connected to a gas turbine (1), a first valve device (V1), a bypass line (L3) bypassing the carbon dioxide recovery device (3), a second valve device (V2) provided on the bypass line (L3), a third valve device (V3) provided at a position between the bypass line (L3) and the carbon dioxide recovery device (3), a densitometer (D) configured to detect a carbon dioxide concentration in the exhaust gas, and a control device (90) configured to adjust opening degrees of the first valve device (V1), the second valve device (V2), and the third valve device (V3) based on an operation state of the gas turbine (1) and the carbon dioxide concentration.