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Sulfuric acid dew point corrosion has a profound and widespread impact on equipment; it can directly cause equipment failure, lead to soaring maintenance costs, and pose a threat to operational safety. It is a typical \"hidden killer\" in industrial flue gas systems. It directly damages the structure of the equipment, causing honeycomb-shaped corrosion pits to form rapidly in components such as economizers and air preheaters. In the case of ordinary carbon steel, perforations can occur as early as 12 days; equipment that lacks protection sees its service life reduced by more than 60%, and in severe cases, structural failures such as tube bursts and leaks can occur. It significantly increases operational costs. A power plant once incurred direct losses of several million yuan per piece of equipment due to this corrosion, in addition to high expenses related to unplanned shutdowns for maintenance and component replacements ； To avoid corrosion, the exhaust temperature is artificially increased, which also leads to significant waste of thermal energy; under certain operating conditions, the boiler’s efficiency can drop by 1.8%, resulting in thousands of tons of additional standard coal consumption per year. It threatens the safe operation of the system. The viscous deposits formed by corrosion can block the heat exchange channels, increasing the resistance to smoke flow. They can also lead to under-scale corrosion, allowing damage to develop insidiously and making it difficult to detect it in advance; this ultimately results in unplanned shutdowns and disrupts the steady operation of the entire production process.