Importance of corrosion control in thermal power plants

Electricity is a special commodity that is produced and supplied simultaneously. Electricity is also a commodity that is not easy to store, which shows the necessity of safe production in the electric power industry. Power outages due to equipment failure will cause serious losses to users, sometimes catastrophic, and equipment corrosion is one of the important reasons. (Influencing factors of thermal equipment corrosion)

The corrosion of thermal power plant equipment directly affects the safe and economical operation of the generator set. For example, the corrosion damage of the copper tube of the condenser has become one of the main factors affecting the safe operation of high-parameter and large-capacity generator sets. According to statistics, about 30% of the corrosion damage accidents of large boilers abroad are caused by the corrosion damage of the condenser, and the proportion in China is higher. In addition to the direct loss of condenser pipes, the direct damage of the condenser copper pipes is more important, because the water quality requirements of large boilers are high, and the water quality buffer is small, so once the condenser leaks, the cooling water leaks into the condensed water, which deteriorates the condensed water quality, and will cause corrosion and scaling of the furnace system, boiler and steam turbine. Especially for condensers cooled by sea water, when the leakage is serious, the boiler tubes will be seriously damaged in a short period of time, even within a few hours. Corrosion not only causes economic losses, but also poses a threat to safe production. In addition, the corrosion of thermal power equipment also directly or indirectly accelerates the consumption and waste of natural resources, and affects the control of pollutants in the thermal power generation process to a certain extent. at the same time, the continuous emergence of material corrosion problems also hinders the development of thermal power generation technology in a more efficient and environmentally friendly direction, especially in the harsh operating environment (high temperature and high pressure) of ultra (super) critical units, the choice of materials should first consider their corrosion resistance.

Corrosion is controllable. It is generally believed that many corrosion damages can be avoided if the existing anti-corrosion technology can be fully utilized, and strict anti-corrosion design and scientific management are adopted. However, it has to be said that there is still no effective anti-corrosion method to avoid more than half of the corrosion losses. It is necessary to gradually improve the basic theory of corrosion, develop corrosion and protection technology and engineering application research.