What critical factor should be monitored to ensure boiler efficiency?

Monitoring the number of plugged tubes is crucial for maintaining boiler efficiency because plugged tubes can significantly impede the flow of water and steam within the boiler system. The presence of plugged tubes leads to reduced heat transfer efficiency, which can result in inadequate steam production and increased fuel consumption. This ultimately affects not only the operational efficiency of the boiler but also its overall safety. When tubes become plugged, it may also cause localized overheating, potentially damaging the boiler components.

While factors like the temperature of the tubes, pressure in the drum, and quality of the fuel are also important for boiler efficiency, they do not directly address the structural integrity of the boiler water tubes as the number of plugged tubes does. Plugged tubes can lead to broader system failures if not monitored and addressed promptly, making this factor critical in the operational management of boiler systems.