Detailed construction steps of insulation ceramic fiber blanket for tunnel kiln

     Kiln roof insulation

     The construction steps of the kiln roof thermal insulation project is:high aluminum insulation ceramic fiber blanket is laid in advance at the overlapping part of the fire-resistant ceiling plate and the inner straight wall, and the high-aluminum insulation ceramic fiber blanket is filled with V-shaped joints of the refractory ceiling plate to make 20mm thick light weight refractory sealing layer, the laying of thermal insulation layer (including the installation and insulation of coal injection pipes and air ducts), and sealing of kiln roof surface. 

     1. Fire-resistant hanging plate overlaping with straight wall

     Before hanging the refractory hanging plate, lay a layer of high alumina insulation ceramic fiber blanket on the top surface of the wall, the thickness of which is a little greater than one third of the distance between the top plate and the wall surface, to ensure that the kiln wall will not arch the refractory hanging plate after being heated and expanded.

     2. Filling of V-shaped seam of refractory hanging plate

     The V-shaped seam of the refractory hanging plate must be filled with high alumina insulation ceramic fiber blanket . The thickness of the high-aluminum insulation ceramic fiber blanket used between the hanging plates is determined by the minimum size below the V-shaped seam, so that the thickness of the blanket can be compressed tightly, and the insulation ceramic fiber blanket is full and compact. At the joints of the high-aluminum insulation ceramic fiber blanket, both blanket need to be 5mm longer. So when the butt joints are flattened, they can be compressed tightly and without gaps. This must be done in construction, otherwise there will be a gap between two blanket, and the hot air will flow towards the top of the kiln, which will easily damage the kiln top. The insulation ceramic fiber blanket between the boards should be set aside in the middle of the blanket so that a section of the blanket is overlapped on both sides of board to prevent the  blanket from falling.

     3. Light weight refractory mortar seal

     The first main kiln top sealing layer is a 20mm thick refractory mortar layer on the top of the hanging plate. This sealing layer can also be made of aluminum silicate castable. Regardless of the material used, this sealing layer must be done well.

     Above is the introduction of laying of insulation ceramic fiber blanket for tunnel kiln. Next issue we will continue to introduce the insulation of tunnel kiln roof. Please stay tuned.