The compound sealing oil baffle of a steam turbine is a high-level sealing device specially designed for the high-pressure area of large steam turbine generator units, especially for the potential gap leakage problem between the rotor and stator. It plays a crucial role in ensuring the safe and efficient operation of steam turbines, preventing the mixing of lubricating oil and working fluids (such as steam or hydrogen), and reducing energy loss. The following is a detailed introduction to the compound sealing oil baffle of steam turbines:
Design principles and construction:
A double sealed oil baffle system usually consists of two or more layers of sealing structures, each layer having independent sealing functions, together forming a tight protective system. The outermost layer is usually a gas seal, which forms a barrier using positive pressure gases (such as clean air or hydrogen) to prevent external pollutants from entering. Following closely behind is the oil sealing layer, which uses sealing oil with a certain pressure (such as lubricating oil) to block the leakage of steam or hydrogen, and lubricate the contact surface between the rotor and stator, reducing wear. The innermost layer may also contain finer labyrinth or brush seals, further enhancing the sealing effect.
Features and advantages:
1. Prevent leakage: The duplex design ensures that even if one layer of sealing fails, the remaining layers can continue to function, greatly reducing the risk of refrigerant leakage and improving the safety and reliability of system operation.
2. Energy conservation and emission reduction: By reducing steam or hydrogen leakage, thermal efficiency is improved, energy consumption is reduced, which is beneficial for environmental protection and operational cost control.
3. Extending equipment life: Good sealing performance reduces wear between the rotor and stator, reduces maintenance frequency, and extends the service life of the steam turbine.
4. Strong adaptability: The compound sealed oil baffle can adapt to the operational requirements of the steam turbine under different working conditions, especially in dynamic processes such as start stop and variable load, ensuring the continuity and effectiveness of the seal.
5. Easy to maintain: Although the structure is complex, the design takes into account maintainability, making it easy to regularly inspect and replace sealing components, ensuring the long-term stable operation of the system.
Application examples:
In large thermal power plants, nuclear power plants, and some specific industrial applications, especially those systems that use hydrogen cooled generators, the application of turbine double seal oil baffles is particularly common.
