EXHAUST GAS PROCESSING DEVICE AND EXHAUST GAS PROCESSING METHOD

摘要

The object of the present invention is to provide a flue gas treatment apparatus and a flue gas treatment method capable of greatly reducing operational costs while maintaining efficiency of removing SO 3 at a specific level or higher, which is superior compared with conventional apparatuses. A flue gas treatment apparatus for removing sulfur contents contained in combustion flue gas, comprises treatment agent feeding means (2) for feeding a treatment agent (102) into a flue (11) through which the combustion flue gas (100) flows, temperature decreasing means (3) for cooling the combustion flue gas (100) to which the treatment agent (102) has been fed and condense SO 3 components in the combustion flue gas (100), an electric dust collection apparatus (4) provided in the flue (11) that is arranged downstream of the temperature decreasing means (3) in the direction of flow of the flue gas, a desulfurization apparatus (5) based on a lime-gypsum process, provided downstream of the electric dust collection apparatus (4) in the direction of flow of the flue gas, and a circulation line (6) for feeding a portion of the dust particles (101) recovered by the electric dust collection apparatus (4) into the flue (11) that is provided on an upstream side of the temperature decreasing means (3) in the direction of flow of the flue gas for circulated use thereof as the treatment agent.