Boiler water cold wall anti-wear anti-corrosion coating increases the corrosion resistance and wear strength of pipe wall

China Paint Online News Information

a power plant circulating fluidized bed boiler water-cooled wall pipe design material for 20G, specifications of 60×5, the number of tubes for the front and rear walls each 111, left and right walls each 75, water-cooled wall straight pipes divided into 2 layers of welds butt, the lower weld from the lower anti-grinding pouring material about 5 meters. Since the operation of anti-corrosion coating experts long-term tracking, found that boiler water cold wall lower butt welds and welds under the water cold wall, especially the weld remaining high grinding is not smooth or the upper and lower pipe butts more obvious parts and water-cooled wall pipe and lower anti-grinding pouring material between the upper transition boss of the anti-grinding coating are more serious wear phenomenon.
Boiler water-cooled wall pipe wear system through analysis shows that fuel, limestone and high temperature bed material in the furnace of the circulating fluidized bed boiler mixed combustion and desulfurization, from the dynamic point of view of the fluid bed furnace, the fluid structure is a ring -nuclear structure, in the internal core area, The high temperature flue gas clip produced by the fuel flows vertically upward with the material, the concentration of solid particles in this area is relatively thin, while in the outer ring area near the water-cooled wall, the concentration of solid particles is larger, and the water-cooled wall flows down the wear pipe wall, in the process of downward flow, the concentration of solid particles of the material increases exponentially and the flow rate accelerates. Anti-corrosion coating experts proposed that the water-cooled wall pipe coated with flue gas anti-corrosion paint, effectively solve the problem of water-cooled wall tube anti-wear anti-corrosion, solve when the water-cooled wall flowing down the material particles flow to the weld boss site and water-cooled wall pipe and lower Anti-grinding pouring material between the transition area of the boss site, on the one hand, wash the wear pipe wall, on the other hand, part of the particle rebound, coupled with the furnace upward solid material flow effect, in this part of the local vortex, once again on the pipe wall slope brush wear. When the boss is larger, the more severe the wear, the greater the range, and the larger the reverse.
Water-cooled wall pipe anti-corrosion coating on strong corrosion and rust anti-corrosion effect is good, flue gas corrosion media, different corrosion media content of fuel is also different, high temperature and wear resistance, it has become a water-cooled wall pipe corrosion serious, the material oxidation corrosion loss is large. Over the years on the study of flue gas corrosion, the production of flue gas anti-corrosion coating has been painted on the national boiler water-cooled wall pipe, anti-corrosion effect is good, long-term use time, has been unanimously praised by customers.
According to the corrosion characteristics of high temperature water-cooled wall pipe, it can be divided into 5 main corrosion zones, namely, the original flue gas corrosion zone, the temperature flue gas corrosion zone, the inlet flue dry and wet interface corrosion zone, the absorption tower corrosion zone and the net flue gas corrosion zone. Boiler emissions of flue gas general temperature of about 180 degrees C, relative humidity of 3%, containing ash and a variety of corrosive components, such as SO2, HCl, NO2 and salt spray, and even some fluoric acid in the presence of strong corrosion gases. In the process of desulfurization, it also has the characteristics of alternating acid and alkali quality, so the equipment corrosion is serious, anti-corrosion conditions are more demanding. In recent years, in the water-cooled pipe flue corrosion coating research and development practice, anti-corrosion research and development personnel learn from the previous experience and lessons of flue gas water-cooled pipe flue corrosion, according to hundreds of flue flue scene, do everything possible, bold innovation, the use of new technology, combined with high-tech, The successful application of flue gas anti-corrosion coating coating, the coating's amazing anti-high temperature flue gas, water-resistant wall pipe flue condensate corrosion effect, high temperature, high hardness wear resistance, acid and alkali resistance, good expansion coefficient, can be used for more than 10 years.
High temperature flue gas acid corrosion on the use of anti-corrosion paint, flue gas water-cooled wall pipe sulfur dioxide, sulfur trioxide, hydrogen fluoride, hydrogen chloride and other acidic corrosive gases will not condense into acid to corrode the water-cooled wall pipe, water-cooled wall pipe actual life is much greater than 30 years. In order to solve the problem of anti-corrosion of water-cooled wall pipe pipe with moisture, we must seek a kind of anti-corrosion, temperature-resistant, temperature-resistant and wear-resistant adhesion and good material, flue gas water-cooled wall pipe anti-corrosion coating provides us with a better choice. So far, at least, this should be the best way to solve the problem.
Flue gas water cold wall tube anti-corrosion coating is made of fine materials, inorganic polymer-based inter-permeable network polymer as a film-forming substance of flue gas water cold wall tube anti-corrosion coating, the main components of the coating using nano-micro-powder, ceramic microbeads, silicon carbide, boron nitride, fine crystal alumina, ultra-fine zinc oxide, titanium oxide, etc., to make metal ceramic functional special fillers to improve wear resistance, corrosion resistance. Enhance the impact resistance of the coating with inorderable fibers. Serve with appropriate pigments, solvents, additives and add wear-resistant enhancers. Flue gas water-cooled wall pipe anti-corrosion coating and traditional polycarp, foam glass brick, glass scales, OM paint or glue, it has a high temperature range, light coating, high hardness, long service life, good durability, service life can be up to 10 years, in the course of operation damaged coating can be easily repaired. No contamination of the environment during preparation, coating and coating.
1, flue gas water cold wall pipe anti-corrosion coating has excellent resistance to chemical corrosion, especially condensate sulfuric acid corrosion
capacity;
3, flue gas water-cooled wall pipe anti-corrosion coating has excellent resistance to high temperature and temperature rapid change performance, can meet the long-term operating temperature between 45-600 degrees C fluctuations, short-term operating temperature of 800 degrees C, protection action temperature
of 850 degrees C; Boiler water-cooled wall pipe wall painting flue gas anti-corrosion coating finally realize the desire to fundamentally reduce the rate of water-cooled wall wear, to achieve the goal of cure, and thus extend the life of the circulating fluidized bed boiler water-cooled wall, and its installation is simple and convenient, low cost, do not need to carry out a large number of transformation of the furnace.