Jul 21 , 2025
In the construction of glass kilns, the insulation performance of the furnace bottom and the area beneath the melting tank is critically important. It directly impacts the kiln's energy efficiency, structural stability, and operational lifespan. High-density calcium silicate boards, with their exceptional high-temperature resistance, high strength, low thermal conductivity, and dimensional stability, are widely applied as paving blocks (or bottom blocks/sole insulation layers) in glass kilns.
High-density calcium silicate boards are mainly used as the insulating support layer beneath the refractory bricks of the glass kiln bottom. Specific locations include:
1. Melting Tank Bottom Insulation: Below the refractory materials (e.g., fused cast mullite, zircon bricks) that form the bottom of the molten glass tank, multiple layers of high-density calcium silicate boards are laid as the primary insulation layer.
2. Working End and Fining Zone Bottoms: Similarly used as effective insulating support beneath the refractories in these areas.
3. Furnace Bottom Structural Fill: In some designs, they are used to fill complex bottom support structures, providing uniform insulation and load-bearing capacity.
1. Exceptional Insulation Performance: High-density calcium silicate boards possess extremely low thermal conductivity, significantly reducing heat loss from the bottom of the glass melting tank. This directly enhances the kiln's thermal efficiency, lowers fuel consumption, and delivers substantial energy savings for glass manufacturers.
2. High Strength and Load-Bearing Capacity: The kiln bottom must withstand immense pressure from the molten glass and the weight of the overlying refractory materials. High-density calcium silicate boards offer excellent compressive strength, reliably supporting the upper structure and the weight of the molten glass, ensuring the long-term structural integrity of the furnace bottom.
3. Superior Dimensional Stability: At the high operating temperatures of glass kilns (bottom areas potentially reaching 500-800°C, while top temperatures exceed 1000°C), high-density calcium silicate boards maintain excellent dimensional stability. They resist deformation, shrinkage, or expansion, preventing the formation of gaps or stress concentrations at the furnace bottom and ensuring the overall integrity of the lining.
4. Good Durability: Unlike some fibrous materials that might powder or settle over time, this material maintains its insulating and supporting functions over extended periods. This prolongs the kiln's service life and reduces the frequency of costly shutdowns for maintenance.
5. Easy Installation and Machinability: High-density calcium silicate boards can be precisely cut and laid according to kiln design specifications, simplifying the construction process and increasing installation efficiency.
As paving blocks in glass kilns, high-density calcium silicate boards provide robust insulating support and structural stability, effectively improving the kiln's energy utilization efficiency, extending its operational lifespan, and ensuring the reliability of the furnace bottom structure. They are an indispensable key material in modern glass kiln design.
