Ceramic fiber, also known as aluminum silicate fiber, is currently one of the refractory materials with relatively low thermal conductivity and excellent thermal insulation and energy-saving performance (excluding nanomaterials). As a furnace lining material, ceramic fiber offers many advantages, including light weight, high temperature resistance, good insulation performance, and convenient installation. It is a high-quality industrial furnace lining material. The following issues should be noted during application:
Ceramic fiber furnace linings do not require baking (dry-out) after installation. Therefore, before commissioning, the lining must be well protected to prevent soaking by rainwater, moisture, or steam.
To prevent corrosion of the furnace wall by sulfur dioxide in the fuel and flue gas, a high-temperature anti-corrosion coating should be applied to the inner surface of the furnace wall during installation. In addition, a metallic aluminum foil gas-barrier layer should be considered in the design.
The interlayer temperature in composite linings must not be overlooked. If the thickness of the hot-face ceramic fiber layer is insufficient, the interlayer temperature will rise, causing the backup lining materials to exceed their temperature limit and become damaged. This will inevitably compromise the integrity of the entire lining and reduce its service life.
The material selection and welding quality of anchor components must be safe and reliable. Improper material selection or poor welding may lead to corrosion and detachment at the root of the anchor studs, resulting in lining failure.
The welding of the steel plate on the furnace roof, as well as the connections between the furnace roof and the convection chamber, must be fully welded and tightly sealed to prevent rainwater from entering the furnace and damaging the lining.
During construction or emergency maintenance in operation, personnel walking on the furnace roof or transporting materials may cause vibration damage to the lining; such situations must be prevented.
When the furnace operates under positive pressure, special attention must be paid to the use of ceramic fiber linings.
