The corrosion problem in thermal power plants that should not be ignored
Thread Content
A region that relies heavily on coal combustion leads to significant corrosion, resulting in pollutants such as acid rain. Air pollution caused by coal-fired power generation is quite severe; it falls under the category of soot-based pollution, with dust, sulfur dioxide (SO2), and nitrogen oxides (NOx) being the main pollutants in the atmosphere. Thermal power plants represent a complex corrosion environment; in addition to the severe atmospheric corrosion caused by coal combustion, they are also subject to corrosion on the inner walls of various storage tanks, as well as on the outer and inner walls of circulation water pipes and high-temperature insulation areas. The flue gas desulfurization system (FGD) presents the most severe corrosion conditions of all.
Corrosion issues in thermal power plants that are easy to overlook but cannot be taken lightly include: 1. Corrosion in the flue gas desulfurization system: The environment in the FGD system is extremely harsh; the combined effects of SO2, acidic condensate, and high temperatures cause severe corrosion on the inner surfaces of the equipment. 2. Corrosion of boiler flues and chimneys: The acidic flue gases generated by coal burning (containing sulfur oxides and nitrogen oxides) condense to create a highly acidic environment, which accelerates local corrosion of flues, chimneys, and other metal components. 3. Corrosion of circulating water pipelines: Circulating cooling water pipelines are in contact with cooling water for extended periods; not only can their inner walls be corroded by impurities, ions, and microorganisms present in the water, but atmospheric corrosion or soil corrosion may also occur on their outer walls. 4. Corrosion of storage tanks and vessels: Inside the tanks used to store fuel oil, coal ash slurry, and chemical additives, the acidic components present in these substances severely affect the service life of the tanks. 5. Corrosion in high-temperature insulated areas: If the insulation material used in equipment operating at high temperatures becomes wet or is not properly sealed, it can lead to \"corrosion beneath the insulation layer\"; such corrosion is hidden and difficult to detect. These corrosion issues can cause equipment failures, reduce safety performance, and shorten the equipment’s lifespan; they require close attention, along with appropriate protective measures for management and prevention. .