Inner Liner

The Inner Liner is a critical component of insulated tunnel casings, designed to provide a continuous thermal barrier that minimizes heat transfer between the internal process environment and external surroundings. It functions as the primary interface between the product flow and the casing structure, ensuring consistent temperature maintenance while protecting the outer casing from thermal stress, corrosion, and mechanical wear. Typically constructed from high-temperature resistant materials with low thermal conductivity, it features precise dimensional tolerances and surface finishes to optimize thermal efficiency and prevent product contamination.

The Inner Liner operates on the principle of thermal insulation by creating a low-conductivity barrier that reduces heat transfer through conduction, convection, and radiation. It maintains temperature gradients by reflecting radiant heat and trapping insulating air layers, while its material properties resist thermal degradation. The liner's structural design ensures minimal thermal bridging and accommodates thermal expansion differentials between the liner and outer casing.