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Battling oxidation and carburization

Corroded tip of a lime kiln fuel lanceWhen kiln temperatures hit the 900–1,000°C range, it’s not uncommon to find high-temperature corrosion in the form of oxidation scale on the surface of the tube, sulfidation or carburization. Materials such as Alleima® 253 MA can extend service life and reduce maintenance costs for lime kiln lances under severe high temperatures, making them cost-effective alternatives to more conventional stainless steel tube grades such as ASTM 310H or 316H. Because different fuels affect the corrosion mechanism differently, we might recommend a material like Alleima® 4C54, for example, for use with sulfur-rich fuels.

Lime production

Often referred to as "quicklime", lime is the product obtained by burning limestone and other calcium-rich substances. Limestone is comprised of calcium carbonate (CaCO₃), which breaks down during the burning process to produce calcium oxide (CaO) or lime, and carbon dioxide (C0₂), which is released, leaving the lime in a lumpy or powdery form which is usually white. Both weight and volume losses occur during the process.

• Annular shaft kilns
• Regenerative kilns
• Rotary kilns
• Slaking lime