Platen Superheater Pipe Sliding Block Assembly

The platen superheater pipe sliding block assembly is a critical friction component that allows for relative movement between the tube platen and the support structure. Its core function is to coordinate the thermal expansion of the tube platen through a "sliding contact," while also transferring loads and limiting unintended displacement. It is a core component system that ensures the safe operation of the platen superheater. Compared to a single sliding block, the sliding block assembly emphasizes the "mating relationship" (e.g., the combination of a sliding part and a support part). Its design directly affects the release of thermal stress and the long-term reliability of the tube platen.

The superheater pipe sliding block assembly is typically made of ZG16Cr20Ni14Si2 material, which has good high-temperature, corrosion, and wear resistance. The functions and structure of the sliding block assembly are as follows:

1. Structural Composition:

The sliding block assembly usually consists of a sliding block and a support block. The sliding block is in contact with the superheater tube bundle, allowing the tubes to slide as they expand with heat. The support block is fixed to the boiler structure, providing stable support.

2. Functions:

• Ensures Platen Flatness: Prevents tubes from becoming dislodged or misaligned.

• Prevents Slag Formation: Through a reasonable design, it reduces the accumulation of clinker on the tube platens.

• Absorbs Thermal Expansion: Allows the tube platen to move freely as it expands with heat, reducing thermal stress.

Installation and Maintenance of Superheater Sliding Block Assembly

1. Installation Precautions:

• Clean Surfaces: Ensure the surfaces of the sliding block assembly and the tube platen are clean and free of impurities and oil stains before installation.
• Welding Quality: Ensure the quality of the weld during welding to avoid welding defects.
• Pre-compensation for Expansion: Pre-compensate for thermal expansion based on calculated results to absorb the thermal expansion of the tube platen.

2. Maintenance Recommendations:

• Regular Inspection: Regularly inspect the sliding block assembly for wear and secureness.

• Timely Repair: If cracks or detachment are found in the welds of the sliding block assembly, repair them promptly to avoid secondary damage to the tube platen.

The design and installation of the platen superheater sliding block assembly are crucial for the stable operation of the boiler system. Correct installation and regular maintenance can effectively extend the service life of the equipment and ensure the safe operation of the boiler system.