Insulation of the preheating section in vertical kilns
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The preheating section at the top of a vertical furnace needs to be insulated; there is an open flame, and the temperature ranges from 900–1000°C. How should this be handled? Outside or inside? What material should be used?
The outside of the preheating section is at 300°C, and it has a high-temperature anti-corrosion coating; if insulation is to be applied, does that mean the anti-corrosion layer has to be removed?
It seems to work either way, inside or outside. If insulation is needed on the inside, there are modular insulation blocks that can be stacked layer by layer; however, a framework is required
Inside the furnace, refractory bricks should be used. To achieve insulation, materials such as alumina panels, lightweight bricks, insulating castables, insulating vermiculite, and calcium silicate can be used as insulation materials outside the refractory bricks.