What are the two primary purposes of refractory linings?

Refractory linings are specifically designed to withstand high temperatures and protect the underlying structures from extreme thermal conditions. The two primary purposes of these linings are corrosion resistance and insulation.

Corrosion resistance is critical because many applications involving refractory linings occur in aggressive environments, such as furnaces or reactors, where acidic or basic substances may be present. The lining acts as a barrier, preventing direct contact between the corrosive materials and the vessel walls, thereby prolonging the lifespan of the pressure vessel.

Insulation is another essential function of refractory linings. These materials have low thermal conductivity, which helps to minimize heat loss during operation and ensures that the temperatures within the equipment remain stable and effective. This thermal insulation is vital for energy efficiency and the overall performance of high-temperature processes.

While there may be other considerations with refractories, such as mechanical strength or noise reduction, these do not encompass the primary functions as effectively as corrosion resistance and thermal insulation do.