On A Typical Power Plant Boiler Failure And Protection

With the rapid development of China’s national economy and the continuous improvement of people’s living standards, the demand for electricity is growing surge, and promote the rapid development of the construction industry and power generation equipment manufacturing industry. In the thermal power industry has accounted for a large proportion. Utility boilers are important components of thermal power generation.Structural power plant boiler, with all aspects of materials, welding, etc. are relatively complex operation, in general, power station boilers including multiple systems, such as economizers, water wall, superheater, reheater, boiler pipes range, bearing support hanging systems. On the one hand, each of the system due to their different conditions, in the long run there will be a different process defects, these defects, understand its causes, targeted for improving testing, is necessary. On the other hand, for different furnace, different combustion, different run times, even within the same system, the probability of different defects is not the same. Here we have one of the typical boiler water wall temperature sulfur corrosion failure analysis, high temperature oxygen tube boiler heating surface corrosion analysis.1.A boiler water wall temperature sulfur corrosion (out of wall)Because of rising coal prices in recent years, resulting in the increasing cost of power generation, power generation companies rarely use design coal, while the higher sulfur content of coal purchased, resulting in high-temperature sulfur corrosion of water wall is getting worse. Through parts of the water wall temperature sulfur corrosion occurs, analyze the causes and proposed treatment measures.2. Boiler heating surface temperature oxygen corrosion (inner wall)According to the structure can be divided into π boiler type furnace and tower type furnace, due to cost control most power plants using π-type furnaces. Due to the presence of high-temperature oxide tube wall sections, tubes and load changes when different coefficients of expansion of scale, resulting in oxidation of skin off, resulting in short-term overheating occurs pipe burst pipes. Based on the site of the high temperature heating surface oxygen corrosion occurs, analyze the causes and proposed treatment measures.3. Desuperheater failureDesuperheater steam temperature is one important way to adjust. Because less warm water and steam has a larger temperature difference, in order to avoid mechanical fatigue pipes at the cylinder wall temperature reduction and thermal fatigue, reduce temperature water pipe enters the desuperheater cylinder casing structure adopted at the same time to prevent a direct role by warm water in the wall of the cylinder body desuperheater, spray desuperheater are equipped with protective liner. Through parts of the desuperheater happen, causes analyzed, and treatment measures.