In boiler terminology, what does "fouling" refer to?

In boiler terminology, "fouling" specifically refers to the buildup of deposits on heat transfer surfaces. This phenomenon occurs when substances such as soot, scale, or other impurities accumulate on the surfaces where heat exchange occurs, such as tubes in a boiler or heat exchanger. Fouling can significantly impede the efficiency of heat transfer, leading to increased fuel consumption, higher operating costs, and potential overheating or system failure due to reduced heat transfer capabilities.

By understanding fouling, operators can take preventive measures, such as regular cleaning and maintenance, to ensure optimal boiler performance and efficiency. Monitoring and addressing fouling is crucial to maintain the effectiveness of the boiler and prolong its lifespan. In contrast, the other options relate to different aspects of boiler operation and do not define fouling itself.