Operating Characteristics of Centrifugal Fan Blades in Dust-Removal Boilers

Operating Characteristics of Centrifugal Fan Blades in Dust-Removal Boilers

The structural design of centrifugal fans for dust-removal boilers is generally based on aerodynamic principles. At the same time, to maximize operational efficiency, aerodynamic lift requirements must also be taken into account during blade design. For example, when examining the performance curves of a dust removal boiler centrifugal fan, it can be observed that both the peak efficiency and peak power are very close to the peak of the speed curve. This peak efficiency actually represents the operational efficiency of the fan’s impeller. This is because the air flowing over the blades connects smoothly with them, and lift is generated by each blade. Although this is one method of improving operational efficiency, it has limitations because even slight changes in pressure can lead to significant changes in airflow. This also means that under such conditions, the safety margin of the dust removal boiler centrifugal fan equipment cannot be guaranteed. For example, when the operating point shifts, the points on the dust removal boiler centrifugal fan curve also change. In certain areas, the blades no longer attack the incoming air at a fixed angle but instead use less aerodynamic lift to “work” and move the air. Therefore, the operating point of the dust removal boiler centrifugal fan actually moves with the airflow, and it also employs a more efficient method. When its operating point is located to the left of the static peak, it means it is operating within an unstable range, which is typically caused by surges or stall. In fact, the primary cause of this issue is that the blades of the dust removal boiler centrifugal fan are operating too low in the airflow, which may cause some blades to stop rotating or fall into vortices. Furthermore, if the dust removal boiler centrifugal fan operates in an unstable region, it may also cause damage to the impeller.