With the rapid development of modern industry and the increasing demand for energy conservation and emissions reduction, ceramic fiber modules have become a standard insulation product for high-temperature heating equipment. Correspondingly, inquiries about ceramic fiber modules are also on the rise. Many customers often have questions after reviewing quotations: why are layered blankets and compensation blankets included in the quote when they were not part of the initial inquiry? The reason is that ceramic fiber modules, layered blankets, and compensation blankets are fixed partners and cannot be separated. This has to do with the inherent structure of ceramic fiber modules.
NO.1 Reasons for Using Blankets in Combination
Ceramic fiber modules are made by folding and compressing refractory fiber blankets of corresponding grades. Due to the high porosity of the interwoven fiber structure, the thermal conductivity is low, resulting in excellent insulation performance. Additionally, since they are made from natural raw materials such as jiaozhi stone and coal gangue, they exhibit high refractoriness. Moreover, the flexibility of refractory fiber modules allows them to be customized to any furnace size, ensuring a highly sealed refractory lining structure.
On one hand, ceramic fiber modules feature a pre-compressed structure. After installation, the packing straps are cut, and the modules expand laterally to press tightly against each other, minimizing gaps.
On the other hand, there is no pre-pressure between the upper and lower rows of modules. When heated, the modules shrink by about 3%. Even if the modules are installed very tightly, gaps will still form between the upper and lower rows after the furnace is started. Flames can penetrate these gaps, damaging the anchors and causing modules to detach, which would irreversibly harm the entire refractory lining. Therefore, to enhance the sealing of the refractory fiber lining, compensation blankets are inserted between the upper and lower rows of modules.
NO.2 How to Use Them in Combination
Compensation blankets are typically made of 20mm thick fiber blankets. They are aligned, folded, and laid on top of the lower row of modules, compressed to about 25mm, before the upper row of modules is installed. Similarly, to ensure sufficient density, layered blankets are placed between the modules and the furnace steel plates, usually in two layers of 30mm or one layer of 50mm.
The cost ratio among modules, compensation blankets, and layered blankets is approximately 30:2:1. This shows that compensation blankets and layered blankets account for a very small portion of the total insulation layer cost. However, they significantly enhance the service life and insulation effectiveness of the system!
