Compared to centrifugal fans, axial-flow fans have the following key characteristics:

  1 If an axial-flow fan is equipped with adjustable blades or stationary vanes, it boasts high regulation efficiency and can operate within the high-efficiency range. Consequently, its operating costs are significantly lower than those of centrifugal fans.

   The efficiency of an axial-flow fan can reach 90% The efficiency of a centrifugal fan with airfoil blades can reach 92.8% The efficiency difference between the two under design load is not significant. However, at low loads, the efficiency of adjustable-blade axial-flow fans or variable-pitch axial-flow fans is considerably higher than that of centrifugal fans with inlet guide vanes.

  2 Axial-flow fans are better able to adapt to changes in airflow within duct systems than centrifugal fans. If the resistance calculations for the duct system are not highly accurate—resulting in actual resistance exceeding the calculated resistance—or if the required airflow and pressure of the fan differ due to a change in coal type, the unit will fail to achieve its rated output. Axial-flow fans can adjust the closing or opening angles of their moving (and stationary) blades to accommodate variations in airflow and pressure, yet this adjustment has little impact on the fan’s efficiency.

  3 Axial-flow fans outperform centrifugal fans in terms of weight and flywheel effect. Axial-flow fans can operate at higher rotational speeds and with higher flow coefficients. Consequently, under the same air volume and pressure conditions, the rotor of an axial-flow fan is lighter—resulting in a smaller flywheel effect. This means that the starting torque of an axial-flow fan is significantly lower than that of a centrifugal fan. Typically, the starting torque of an axial-flow fan and an induced-draft fan is only a fraction of that of a centrifugal fan. 14.2–27.8% 。

  4 The rotor structure of an axial-flow fan is more complex than that of a centrifugal fan, featuring more rotating components and demanding higher manufacturing precision as well as superior quality requirements for blade materials. Consequently, the operational reliability of axial-flow fans is slightly lower than that of centrifugal fans. However, thanks to the introduction of foreign technologies, improvements have been made in the design, structure, materials, and manufacturing processes of adjustable (static) blade axial-flow fans, enabling today’s axial-flow fans to achieve operational reliability comparable to that of centrifugal fans.

  5 If axial-flow fans and centrifugal fans have the same performance, the noise intensity of an axial-flow fan is higher than that of a centrifugal fan. This is because axial-flow fans typically have more than twice as many blades as centrifugal fans, resulting in higher rotational speeds. However, for two fans with identical performance, the noise levels have both been reduced to within the permissible noise standards. 85 Decibels—the investment in silencers isn't much different.