Lightweight thermal insulation bricks play the role of thermal insulation, and the thermal insulation effect is different with different body density.
Lightweight insulation bricks are divided into different materials and different body densities. At present, the proportion of clay lightweight bricks will be more. If it is an insulation layer with too high temperature, it is necessary to use insulation bricks suitable for different temperatures. If the temperature is 1000°C, clay insulation bricks can be used. If the temperature is 1300°C, high-alumina lightweight insulation bricks should be used. If the temperature is above 1350°C, mullite insulation bricks should be used. There are also some light-duty kilns, and the working layer of the lining is also made of lightweight bricks to reduce the weight of the kiln body, so alumina hollow ball bricks should be selected.
Whether it is clay, high alumina, or mullite, there are different body densities of 1.0, 1.2, 0.8, and 0.6. The smaller the body density, the better the thermal insulation effect. The insulating bricks of alumina hollow balls have a body density of 1.2 and 1.0, but for some special materials for furnace lining construction, it is still necessary to choose insulating bricks with a slightly higher strength, because the body density is too small, and the heavy bricks in the working layer will wear the insulating bricks. Worn into pieces during use. affect the insulation effect.
Of course, the body density is different, and the price is not high. The smaller the body density, the higher the price of the insulation brick. Because the size and conductivity of body density are different. The smaller the density of the insulation brick, the lower the thermal conductivity and the better the insulation effect, which saves the fuel in the process of using the kiln body and reduces the production cost.
Moreover, the smaller the body density, the lower the weight of the industrial kiln, and the smaller the body density of the insulation brick, the higher the price of the raw materials used, the better the insulation effect, but the price will also be higher, but the process of choosing a lightweight insulation layer In the middle, the strength should also be considered. The smaller the density of the lightweight insulation brick, the lower the strength. If the body density is too high and the insulation effect is not good, it is necessary to choose insulation bricks with a higher material as the insulation layer. Otherwise, the heavy bricks will grind the insulation bricks, and the insulation effect will be affected. If it is broken, it will move, and the lining of the entire kiln needs to be rebuilt.
However, if the working layer uses alumina hollow ball bricks, there is no need to consider the problem of too small body density. The alumina hollow ball bricks can play a role in heat preservation and can directly contact the flame. It reduces the trouble of the insulation layer and the heavy layer, and can directly play the dual role of heat preservation and use.
Therefore, the density of lightweight insulation bricks is different, and the insulation effect is also different. It is most reasonable to choose according to the temperature of the kiln.