The original intention of the design of the kiln lining is to hope that the masonry has a long service life and excellent thermal status, as a lightweight insulation brick in its application process, if you want to get its high compressive strength will lose the low thermal conductivity, the relationship between the two physicalization is one high and one low. The compressive strength of the insulation brick is directly related to the bulk density and the lightweight raw materials used in production. The higher the high-temperature strength, the higher the volume weight, and the higher the construction cost, the lower the thermal conductivity, and the high insulation will be lost. In the industry, the volume density of light clay insulation bricks currently produced is generally below 1.0g/cm3, and its output and market usage account for 80%, and the market of insulation light clay bricks with a dense body of more than 1.0g/cm3 is almost no production. 1.0 body dense compressive strength is generally between 3.0 and 3.5, as a furnace lining insulation layer to fully meet the market application, if the use of high-strength insulation brick products, you can choose mullite insulation brick or corundum light insulation brick material, For example, mullite insulation bricks and light corundum bricks have the same 1.0g/cm3 bulk density and their compressive strength can reach 5~7 MPa and 12 MPa, respectively, but the thermal conductivity is much higher than that of light clay bricks.
Therefore, it is necessary to make a global consideration and balance in the design. As a high-quality type of lightweight fire-resistant insulation material, light clay insulation brick has low thermal conductivity, excellent high-temperature performance, and chemical stability while resisting high temperature. Excellent high-temperature compressive strength can make it rely on its own to support the weight of the masonry, accurate size can speed up the masonry speed, reduce the amount of on-site processing labor, and brick itself for high temperature fired products without oven. Light clay insulation brick has been widely used in medium and high-temperature industrial furnaces in the oil refining, chemical industry, and metallurgy industry of its unique advantages.
As a typical refractory insulation product, light clay insulation brick has special physical and chemical properties, which should be fully considered in the lining design, analyzing its working state at high temperatures, to formulate a reasonable design scheme. With the continuous improvement of refractory performance requirements for industrial furnace design in various industries, more new technologies and new products will be developed, and lightweight insulation bricks may have broader development prospects and application space in the future by their advantages.
