What does the term 'scale' refer to in boiler conditions?

The term 'scale' in the context of boiler conditions specifically refers to deposits of minerals that accumulate over time within the boiler system, particularly on the heat exchange surfaces. This happens when water containing dissolved minerals, such as calcium and magnesium, is heated and the minerals precipitate out of the water, forming hard deposits. These deposits can significantly impact boiler efficiency and can lead to overheating, boiler failures, and increased fuel consumption due to the reduced heat transfer efficiency.

Understanding scale formation is crucial for maintenance and operational efficiency in boiler systems, and it highlights the importance of water treatment processes to minimize the presence of these minerals in the boiler feedwater. By addressing scale effectively, operators can prolong the lifespan of the boiler and ensure it operates safely and efficiently.