Last episode we introduced insulation brick masonry and insulation layer laying of kiln wall insulation, this section introduces kiln roof insulation.
The construction procedure of the kiln roof thermal insulation project is: High-alumina type needled aluminum silicate fiber blanket is pre-layed in the joint of refractory hanging plate and the inner straight wall lap. The refractory hanging plate V-stitch is filled with high-aluminum type needled aluminum silicate blanket. Make 20mm thick lightweight aggregate fire-resistant mud seal layer, lay the insulation layer, seal the kiln top surface.
1.Refractory hanging plate contact with straight wall
Before the refractory hanging plate is mounted, a layer of high-aluminum type needled aluminum silicate fiber blanket is laid on the top surface of the wall, the thickness of which is about a little larger than one-third of the distance between the top plate and the wall surface, ensuring that the kiln wall does not arch the refractory slab after being heated and expanded.
2、Filling of refractory hanging plate V-shaped seam
The V-shaped seam of the refractory hanging plate must be filled with high-alumina type needled aluminum silicate fiber blanket. The thickness of the needled high-aluminum fiber blanket used between the hanging plates is determined by the minimum size below the V-shaped seam, in this thickness the blanket can hardly be compressed, ensuring the compactness of the needle-punched blanket. At the joint seam of high-aluminum needled blanket, the two blanket must be 5mm longer, so the joint can be compressed tightly when mating and flattening.This should be done all during the construction. Otherwise, there will be a gap between the blanket , and the hot air will smash onto the top of the kiln, which will easily damage the kiln roof. The needled blanket between the board should be pulled out in the middle of the blanket so that the sides are overlapped on the hanging plate to prevent the stuffed needle-punched carpet from falling.
3、Light aggregate refractory mud seal
The 20mm thick lightweight aggregate refractory mud layer on the top of the hanging plate is the first main kiln roof sealing layer. This sealing layer can also be made of aluminum silicate castable. No matter which material is used, this seal must be well done.
Above is the introduction of kiln roof insulation. Hope this can bring help to furnace builders and contractors. Next episode we will continue to introduce kiln roof insulation. Please stay tuned.