Flue/chimney/desulfurization and long-term corrosion protection

The flue gas temperature at the tail of boiler in power plant is generally around 80℃. After the desulfurization device (especially wet desulfurization) is installed, the temperature of flue gas entering the chimney will generally drop to about 50℃. The flue gas after desulfurization contains a large number of corrosive media such as water vapor and unrefined sulfur dioxide, which will corrode concrete or carbon steel materials for a long time and cause serious damage to chimneys. Therefore, the inner wall of concrete chimney must be treated with anti-corrosion. In order to prevent sulfuric acid vapor and chemical corrosion contained in desulfurization, wet flue gas discharged behind the chimney of anti-oxidation power plant is equipped with wet desulfurization device. If it is not heated by flue gas heat exchanger, the temperature of flue gas entering the chimney is 50 5℃, and the inner wall of the chimney is seriously condensed, and the acid produced by condensation flows along the chimney wall. Cylinder. When the temperature of acid solution is between 40°C and 80°C, it is particularly corrosive to structural materials. Taking steel as an example, the corrosion rate at 40℃ ~ 80℃ is about 3-8 times higher than that at other temperatures. Dilin 958 smoke anticorrosion coating has been successfully developed and applied. Gas, desulfurization flue condensate corrosion effect, high temperature resistance, high hardness, wear resistance, acid and alkali resistance, good expansion coefficient, can be used for more than 10 years.