Advanced technology has been developed to make installation of refractories more effective. One particular refractory product to consider is the refractory lining, which is a protective layer inside the kiln or furnace that acts as a form of insulation to withstand high temperatures. It can also protect the structure from thermal shocks, abrasion and chemical attack.
The lining thickness typically ranges from 80 to 300mm. It consists of refractory bricks or monolithic refractories. Among these types of refractory products, fascination with the benefits of fiber refractory lining continue to increase. One major advantage it brings is easy installation. Proper installation is imperative for effective application. Below are three common installation methods of refractory lining.
Fiber Refractory Lining Installation Methods
- Layer Construction (AKA Wallpaper Construction) - This technique has been the most commonly used method that allows lower temperature or lower density insulation materials to be applied as cold-face layers. It involves applying several layers of materials by impaling them over ceramic or special metallic anchors. The fiber materials are considerably less expensive than denser, higher temperature materials. The most significant factor to consider with this simple construction method is the proper use of anchor materials for correct anchor density and positioning. This also ensures that the joints do not line up and that the whole structure is well supported.
- Edge-stacked Construction - In this method, the strips of fiber blankets are stacked so that the edges are exposed as the hot face. They can be anchored secretly to the shells so that there will be no exposed anchors to the hot-face. To compensate possible shrinkage, the layers are compressed. Its advantage over the first method is that the layer edges are much more resistant to high velocity gases. However, the disadvantage of this technique is that the material must be used throughout the entire refractory lining thickness, making it more costly.
- New Modular Concepts - There are different modular concepts for fiber refractory lining and one of the most successful installation techniques is the “accordion-folded” blanket. The hardware is attached near the cold face while the module is fastened mechanically to the kiln shell and is held under lateral compression by cardboard and bands. The installation of modules is done in parquet fashion, and the cardboard and bands are then removed releasing the compression. This compensates for the shrinkage at high temperatures. This technique makes the higher use temperature of fiber refractory installations successful, such as in forge furnaces.
As is the case for all types of refractory linings, it is clear that proper installation is vital to achieve a successful kiln or furnace lining. Here at FibreCast, not only do we supply high quality refractory lining products, but we also provide high quality service and technical advice on their proper installation, as well as the right selection and placement of any attachments. To learn more, call us today at +1 (905) 319-1080!