Anti-corrosion treatment and anti-corrosion coating application of chimneys in thermal power plants

China Coatings Network
News: thermal power plant chimney anti-corrosion treatment and
corrosion paint
applications, chimneys are an indispensable structure in the construction of thermal power plants, in order to achieve long-term safe operation, the durability of its structure occupies a very important position. 1 Zhisheng Weihua chimney smoke anti-corrosion
coatings
engineers found that in coal-fired power plant reinforced concrete chimneys, in order to prevent the temperature of flue gas and flue gas composition of its corrosion, the traditional structure is lining and insulation layer. The corrosion gradually moves to the cylinder wall from the lining, first to the weak part of the corrosion structure and then gradually expand. The gray seams of the lining, the cracks in the barrel wall or the inexilable places of the concrete are the areas where the first corrosion occurs.
thermal power plant chimney anti-corrosion treatment and anti-corrosion coating applications
power plant flue gas corrosive components are mainly SO2, HCl, NO2 and salt spray, and even some fluoric acid containing strong corrosion gas, acid and alkali corrosion, low-temperature flue gas will also have condensate corrosion. Also in the process of desulfurization, but also has the characteristics of acid-base medium alternating, so the equipment corrosion is serious, anti-corrosion conditions are more demanding, while the flue gas flow rate is generally more than 5 meters / second, dust particle size of more than 0.3 mm, dust concentration of more than 10%, the chimney wall has flush wear.
At present, the most used domestic power plants or carbon steel coated glass scales, glass scale materials after curing easy to be brittle, temperature resistance and temperature shock resistance characteristics are poor, very easy to cause scale lining in high temperature and temperature impact, cracking, de-layering phenomenon.
in the domestic market is more common there are silicone rubber, polysaccharides, but the product is not resistant to high temperature, waterproof and acid-resistant performance is very good, not conducive to long-term inline high temperature corrosion. Common also has acid-resistant mud temperature resistance and acid resistance good performance, have a certain adhesion, long service life, but poor waterproof moisture resistance, easy to absorb moisture caused by powder off, very cold easy to produce cracks. By comparison, the ZS-1041 flue gas anti-corrosion coating produced by Beijing Zhisheng Weihua Chemical Co., Ltd. overcomes the shortcomings of the above materials and can fully meet the anti-corrosion requirements of the power plant flue and enhance the life of the flue. According to industry insider Caogong (010-51213106), ZS-1041 flue gas anti-corrosion coatings at the same time have long-lasting anti-corrosion, super adhesion, high line expansion coefficient, high temperature resistance, wear-resistant heat shock, long service life and other advantages, and has been widely used in major power plants, such as Qinhuangdao thermal power plant, Datantokto power plant, Peony River second power plant, Nizhao power plant, Hua energy plant, etc. ZS-1041 flue gas anti-corrosion coating can be applied to brick chimneys, reinforced concrete chimneys and steel chimneys at the same time, the construction is simple and easy, anti-corrosion life is long.
For anti-corrosion of hydrofluoric acid in flue gas, Beijing Zhisheng Weihua company developed ZS-1033 hydrofluoric acid anti-corrosion coating, coating selection phenolic resin, heavy crystal, nanochromium powder, anti-media solid fillers and other special materials refined, the coating is dense and stable, strong acid resistance, especially hydrofluoric acid (HF) corrosion effect, completely overcome the problem of hydrofluoric acid in chimney smoke.