EXHAUST GAS PROCESSING DEVICE AND EXHAUST GAS PROCESSING METHOD

摘要

The purpose of the present invention is to provide an exhaust gas processing device and exhaust gas processing method that can maintain SO3 removal efficiency at at least a constant level as compared to conventional devices, and dramatically curb operation costs. Provided is an exhaust gas processing device that removes the sulfur content contained in combustion exhaust gas and that comprises the following: a processing agent supply means (2) for supplying a processing agent (102) to a flue (11) in which combustion exhaust gas (100) flows; a temperature lowering means (3) for cooling the combustion exhaust gas (100) to which the processing agent (102) was supplied, and condensing the SO3 component in the combustion exhaust gas (100); an electric precipitation means (4) that is provided to the flue (11) of the exhaust gas downstream side of the temperature lowering means (3); a desulfurization device (5) that is provided to the exhaust gas downstream side of the electric precipitation means (4) and that uses the lime-gypsum method; and a circulation means (6) for supplying a portion of dust particles (101) recovered by the electric precipitation means (4) to the flue (11) of the exhaust gas upstream side of the temperature lowering means (3), and causing the dust particles to be circulated and used as a processing agent.