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Secondary air box expansion joint
Keywords:
Secondary air box expansion joint
- Product Description
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The secondary air plenum expansion joint is a critical component in the boiler combustion system, designed to accommodate displacements caused by temperature variations, mechanical vibrations, and other factors. Its design and application must take into account both the thermodynamic characteristics of the system and the structural requirements.
Structure and Operating Principle
Core structure
Bellows body:
They are manufactured from stainless steel (such as 304 or 316L) or high‑temperature alloy materials and utilize the elastic deformation of a corrugated structure to accommodate axial, lateral, or angular displacements.
The number of corrugation layers is determined by the pressure rating and is typically single‑layer or multi‑layer; a multi‑layer structure can enhance pressure resistance and fatigue life.
Connectors and Supporting Structures:
The two ends are connected to secondary air boxes, ductwork, and other equipment via flanges or welding. External limit tie rods or guide brackets are installed to prevent excessive displacement of the expansion joint that could cause damage.
Some expansion joints are equipped with insulation to prevent heat loss or burns from high temperatures.
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