What is the heat-resistant temperature of lightweight heat-insulating refractory bricks
Release time:
2024/01/22 18:41
The insulation layer of the furnace lining is to protect the furnace shell and save energy. Lightweight heat-insulating refractory bricks, lightweight heat-insulating castable fiberboard and other materials are used as the insulation layer.
Due to the light heat insulation refractory brick or castable pores than heavy materials, it is easy to shrink deformation when heated during use. Therefore, in the case of different temperatures to choose different materials of thermal insulation refractory brick or castable, in order to maintain the stability of the furnace lining insulation layer. If the shrinkage is likely to cause the furnace body insulation layer deformation or cracks, increase the heat loss.
Therefore, the choice of lightweight thermal insulation refractory brick or thermal insulation material, mainly depends on the ability to resist shrinkage deformation under the action of heating, thermal insulation refractory brick use temperature, generally with the increase of bulk density. When the volume density is too large, the heat preservation effect is not good, and the heat preservation effect with small volume density is good, but the strength is too low, and it is extremely prone to peeling.
That is to say, at different temperatures, it is necessary to choose the insulation brick or castable suitable for the use temperature, or the fiber material as the insulation layer. The following are the different suitable temperatures for thermal insulation refractory bricks or castables for reference:
The use temperature of slag wool is 600 ℃, and the use temperature range of perlite insulation material is 50-1000 ℃; The service temperature range of calcium silicate insulation board is 650-1000 ℃; The thermal insulation temperature of vermiculite insulation material is 1000-1150 ℃; The applicable temperature of diatomite insulation refractory brick is 1000-1200 ℃; Refractory ceramic fiber 1000-1300 ℃; The applicable temperature of light clay insulation brick 1500 is 1000-1350 ℃; the applicable temperature of light siliceous thermal insulation brick is 1500-1550 ℃; The use temperature of polycrystalline alumina fiber is 1400-1600 ℃; The use temperature of mullite lightweight thermal insulation refractory brick is 1350-1650 ℃; The use temperature of light corundum thermal insulation brick is 1650-1800 ℃; Alumina hollow ball thermal insulation brick 1650-1800 ℃; The applicable temperature of zirconia fiber and hollow ball thermal insulation brick is 1800-2000 ℃.
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