| 摘要 |
<p>Disclosed are an exhaust-gas treatment device and an exhaust-gas treatment method that allow stable operation over long periods of time. The disclosed exhaust-gas treatment device (100), which removes SO3 from a combustion exhaust gas, is provided with: a spray means (140) which sprays an aqueous solution containing a dissolved salt into a flue (130) upstream of a wet desulfurization device (114); and wall-cleaning piping (160), along the walls of the flue (130) in the circumferential direction thereof, which supplies wall-cleaning water to the walls of the flue, thereby forming a liquid film of said wall-cleaning water across the entire surface of the region of the flue (130) to which the aforementioned dissolved salt becomes attached. In the disclosed exhaust-gas treatment method, which removes SO3 from a combustion exhaust gas, an aqueous solution containing a dissolved salt is sprayed into a flue (130) upstream of a wet desulfurization device (114), and wall-cleaning water is supplied to the walls of the flue (130), thereby forming a liquid film of said wall-cleaning water across the entire surface of the region of the flue (130) to which the aforementioned dissolved salt becomes attached.</p> |
