What does boiler scale refer to?

Boiler scale refers specifically to the accumulation of mineral deposits on the heat transfer surfaces inside a boiler. This buildup commonly occurs when hard water is used in the boiler system. As water is heated and evaporates to produce steam, dissolved minerals like calcium and magnesium precipitate out of the water, leading to scale formation.

The presence of scale can significantly reduce the efficiency of heat transfer by insulating the heat exchange surfaces, which in turn can lead to overheating and potential damage to the boiler components. Additionally, scale can increase fuel consumption and operational costs due to reduced thermal efficiency, making it a critical issue that power engineers must manage. Regular water treatment and maintenance practices are essential to mitigate scale buildup and ensure optimal boiler operation.