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Thermal power plant regulating valve pressure plugging technology Xiangjie
Power plant regulating valves are essential components used to control the flow of various fluid media through pipelines and equipment. Over time, these valves may experience leakage due to wear and tear, which can occur at critical points such as the packing, flange seals, and valve body. These leaks not only lead to fluid loss but also increase operational costs, reduce efficiency, and negatively impact the economic performance of the power plant. In cases where the medium is toxic, flammable, or corrosive, leaks can pose serious safety hazards, including accidents like fires, explosions, and environmental contamination. Therefore, addressing valve leakage is crucial for ensuring safe and efficient power plant operations.
Leakage in regulating valves typically occurs in three main areas: the packing, flange seals, and the valve body itself. Packing leakage is common due to the repeated motion between the stem and packing material, leading to gradual wear, loss of elasticity, and eventual failure. Flange leaks often result from improper gasket installation, bolt loosening, or mechanical vibrations, while valve body leaks may be caused by manufacturing defects or erosion from the fluid medium.
To address these issues, pressure plugging techniques have been developed as effective methods for sealing leaks without shutting down the system. This method involves injecting specialized sealing materials into the leak area under pressure, forming a new seal that can withstand the operating conditions. Pressure plugging offers several advantages, including no need for system shutdown, reduced downtime, and lower maintenance costs.
There are multiple approaches to pressure plugging, depending on the type and location of the leak. For example, injection-type plugging is suitable for regulating valves with thick walls, while auxiliary fixtures are used for thinner walls. Copper wire plugging, strip wrapping, and convex clamp blocking are commonly used for flange leaks. For more severe cases, adhesion and welding methods may be applied to seal the valve body.
In practice, pressure plugging has proven highly effective in various power plants, including Panzhihua Iron and Steel Power Plant, where it has been successfully used to fix leaks in main steam valves, high-pressure heater inlets, and Other critical components. These methods not only prevent costly shutdowns but also enhance the overall reliability and safety of the plant.
In conclusion, while pressure plugging is an emergency repair technique with certain limitations, it plays a vital role in maintaining the integrity of power plant systems. It requires skilled personnel, proper tools, and careful planning to ensure successful execution. As this technology continues to evolve, it will become an even more valuable tool in the ongoing effort to improve plant efficiency and safety.