At present, the construction methods of refractory insulation materials used in the melting part and the top of the regenerator can be divided into two types: cold insulation and hot insulation.
The characteristics of refractory insulation materials are to reduce heat dissipation, improve the thermal efficiency of the furnace, and at the same time ensure the life of the furnace. After the refractory insulation material is used for heat preservation, the temperature of the outer surface of the main body brick material will be greatly increased, which requires that the quality of the main body brick material must be good, and high-quality mud must be used. This mud should have a certain degree of cohesiveness at room temperature, so that the bricks will be more firmly bonded during the baking process, and the bricks will not sink or draw lots. Only in this way can the insulated furnace be in good operating condition and achieve the purpose of insulation.
The specific implementation process of this insulation method
1.Cold construction
(1) The melting part and the top of the regenerator
The masonry of the big slab is finished, and the joints are filled with high-quality silica mud and then the strips are tightened. Withdraw the fetus. After 24-48h cold observation confirms that it is stable, clean the top of the dome, and pave the stone with high-quality silica mud, the thickness of which is 10-20mm, and a layer of light insulation brick is laid on the upper part, but the middle of the dome is about 1.5-2m insulation bricks shall not be built at the wide area and at the expansion joints.
(2) Melting part breast wall
Masonry lightweight thermal insulation bricks under cold conditions.
2. Construction of thermal insulation layer
(1) The melting part and the top of the regenerator
Because the thermal insulation coating is paste-like and the construction is extremely convenient, it can be implemented after the kiln is finished, the expansion joints and the middle part of the dome are sealed and the lightweight thermal insulation bricks are laid. Since a large amount of water vapor will be discharged during the heat preservation and drying process, it is easy to fall off if the coating is too thick at one time. Therefore, the coating thickness of a layer should be controlled within 10mm, and the coating thickness can be gradually increased until it reaches the specified requirements. The latter layer can be smoothed.
(2) Side wall part
Since the thermal insulation coating is paste-like, the slurry density is relatively large, when the thickness of the vertical surface is thicker at one time, a large amount of water vapor will be released during the internal drying process, and a large area will fall off. Therefore, when the surface temperature exceeds 50 ℃ or more , It is required that the thickness of one layer is generally not more than 2-3mm. After the layer is dry, apply the second layer. The thickness is controlled at about 10mm. The third layer can be thickened properly until it reaches the specified thickness. Leveling once, and calendering again when the moisture volatilizes about 60%, to ensure a smooth and beautiful surface. Such materials generally do not need to be waterproofed for indoor use.
From the above two methods, it can be known that the refractory insulation materials used in the glass melting furnace are mainly lightweight insulation bricks and insulation coatings. After the heat preservation is implemented, the heat dissipation is effectively reduced and the thermal efficiency of the furnace is improved.
