In order to reduce the heat loss of the furnace masonry, the outer layer of the refractory bricks is insulated. Insulation not only reduces heat loss, saves thermal energy and improves economic efficiency, but also helps to ensure the temperature inside the furnace and improves the labor conditions around the furnace.
The average temperature of the entire refractory brick layer increases after the insulation layer is built, which may adversely affect the service life of the high-temperature melting furnace lining. For this reason, some industrial companies build fewer or no insulation layers in order to ensure the service life of high-temperature melting furnaces. However, the majority of furnaces are still insulated.
The thermal conductivity of the insulation material is low, generally below 0.3W/(m-°C), and the porosity is generally above 50%. Because of the many pores, and thus the bulk density is small (less than 1.3g/cm3), the mechanical strength is low. These are common properties of various insulation materials.
Heat-insulating materials according to the operating temperature, divided into high temperature (> 1200 ℃, medium temperature (900?1200 ℃) and low temperature (< 900 ℃) three. According to the volume density of refractory materials is divided into general insulation materials (bulk density less than 1.3g/cm3), commonly used insulation materials (equal to 0.6-1.0g/cm3), and ultra-lightweight insulation materials (less than 0.3g/cm3).
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