SO x removal equipment 15 which reduces sulfur oxides from flue gas 12 from a boiler 11, a cooler 16 which is provided on the downstream side of the SO x removal equipment 15 so as to reduces the sulfur oxides from the flue gas and decrease a temperature, CO 2 recovery equipment 17 which includes an absorber for bringing CO 2 in the flue gas into contact with a CO 2 absorption liquid so as to be reduced and a regenerator for causing the CO 2 absorption liquid to emit CO 2 so as to recover CO 2 and regenerate the CO 2 absorption liquid, and a wet type electric dust collector 25 for reducing a mist generation material which is a generation source of mist that is generated in the absorber of the CO 2 recovery equipment before introducing the flue gas to the CO 2 recovery equipment, are included.
