In brick kilns, the use of ceramic fiber module can be affected by a variety of environmental factors, leading to degraded performance or problems. Here are some of the main environmental factors and their impacts:
1. High temperature environment
High-temperature chalking: ceramic fiber module work at high temperatures for a long time, which will cause the fine grains in the fibers to gradually grow, and the fiber surface to become rough and cracked. When the crystals grow close to the diameter of the fiber, the strength of the fiber decreases and it cannot withstand the internal pressure during operation, which leads to fiber breakage and pulverization. This is the main reason for the destruction of ceramic fiber module in a high-temperature environment.
High-temperature crystallization: refractory fibers with 50% alumina mass fraction (standard aluminum silicate refractory fibers) are amorphous when cold and flexible. However, after long-term use at high temperatures, the fibers will crystallize, become brittle, shrink, and increase their bulk density. The higher the temperature, the more severe the crystallization, and in severe cases, the fibers will be pulverized.
2. Harmful gas erosion
Alkali, sulfur and other harmful gases: The air composition in the brick and tile roasting kiln is complex, including harmful gases produced by fuel combustion, water vapor produced by the evaporation of green body water, and alkali metal ions present in raw materials. These harmful gases and substances will have complex reactions with ceramic fiber module, corrode fibers, destroy their original structure, and lead to chalking, shrinkage, cracking and other problems.
3. Airflow washing
Wind erosion resistance: When ceramic fiber module are used as linings, they need to be washed by the air flow in the furnace. If the air velocity is too high, it will aggravate the detachment and wear of the fibers, resulting in the thinning of the kiln wall, the deterioration of the insulation effect, and the increase of heat loss, which will affect the thermal efficiency of the brick kiln.
4. Other factors
Mechanical collision and material friction: ceramic fiber module has low strength and is susceptible to damage due to mechanical collision and material friction. Therefore, direct contact with hard objects or strong mechanical shock should be avoided during use.
Thermal Loading Conditions: The shrinkage rate of ceramic fiber module under thermal load may be much higher than the shrinkage rate given on the product sheet without thermal load or short-term heating. Therefore, it is necessary to consider both the operating temperature and the thermal load conditions when selecting.
In summary, factors such as high temperature environment, harmful gas erosion, air erosion, mechanical collision and material friction can all cause problems in the use of ceramic fiber module in brick kilns. In order to ensure the stable use of ceramic fiber module in brick kilns, it is necessary to comprehensively consider these environmental factors and take corresponding measures for protection and maintenance.