At present, our country is more commonly used gypsum wet limestone flue gas desulfurization process, heating device is not arranged under normal circumstances, the removal of SO2 in flue gas desulfurization rate is higher, can reach more than 95%, but the main components caused by corrosion of flue gas SO3 removal rate is only about 20%. After wet flue gas desulfurization, temperature of about 40 DEG to 50 deg. the chimney flue gas positive pressure operation, high water content, residual SO2 and SO3 in flue gas and HF acid gas in the chimney condensation formation of acidic condensate, will cause serious corrosion of chimney. Wet flue gas desulfurization treatment is a kind of corrosion of high strength, strong permeability, and is difficult to prevent the low temperature and high humidity dilute acid, according to the evaluation of corrosion resistance of flue gas after desulfurization of international industrial chimney Association, wet flue gas desulfurization belongs to strong corrosive flue gas chimney level, should be in accordance with the strong corrosive gas to structure safety design, must be on the inner wall of chimney anti-corrosion treatment. Chimney lining
The chimney lining anticorrosion material should have the following characteristics, to ensure the safe operation of the whole power plant chimney and its structural safety, have very good adhesion with the substrate, excellent chemical resistance, especially the ability of 1041 anticorrosive coating liquid acid corrosion, good flexibility, can resist the inevitable vibration of steel chimney operation, excellent high temperature resistance and high temperature properties of alternating, should meet the long-term working temperature between 45 ~ 160 degrees fluctuation, short-term operation temperature of 480 DEG C.
According to the research, flue and chimney desulfurization and dedusting equipment corrosion characteristics of years of on-site observation, experiment research and anticorrosive thousands of simulation, application of science and technology, Beijing Zhi Sheng Wei Hua Chemical Co., relying on its own technical strength, combined with years of large domestic power plants, steel mills, cement plants, smelting factory cooperation experience, successfully developed anti chimney flue condensate corrosion Weihua ZS-1041 flue gas anticorrosive coating. The 1041, Weihua polyurea anticorrosion coatings and traditional foam glass brick, glass flake, OM paint or clay traditional anticorrosion materials in different temperature range, it is high, coating light, waterproof, and acid and alkali resistance, thermal performance, strong adhesion, long service life, durability, damage to the coating easy to repair. 1, Zhi Sheng gas anticorrosion coating has excellent resistance to chemical corrosion, especially condensed sulfuric acid corrosion; 2, ZS-1041 Wei Hua gas steam resistant anticorrosion coating has very high permeability; 3, flue gas ZS-1041 anticorrosion coating has properties of high temperature resistance and high temperature rapid become excellent, can meet the long-term the temperature fluctuates between 45 to 600 DEG C, short-term operation temperature is 800 degrees centigrade, the temperature of 850 DEG C protection action; 4, ZS-1041 have high flexing resistance and thermal expansion of antidegenerative coating for flue gas anticorrosive coating, resistant steel chimney after reinforcement vibration but still cannot be avoided in the operation; 5, ZS-1041 flue gas resistance anticorrosive coating and steel substrate has good adhesion, thermal shock resistance and wear corrosion resistant coating.
In addition, the flue gas desulfurization facilities and the impact of changes in the operating conditions of the unit, the flue gas temperature and humidity changes, that is, flue gas dry, wet, high low temperature state conversion is difficult to avoid. Zhi Sheng Wei Hua engineer anticorrosive coating recommendations, and before the bypass baffle not sealed wet FGD system installed most of the power plants flue gas bypass system, when the bypass damper opens, the flue gas temperature reaches 160 degrees Celsius, or even higher, this alternating hot and cold condition for anti corrosion Design of this chimney is difficult to completely adapt to the operation the conditions of these frequent changes. Chimney lining