Energy-Efficient Centrifugal Fan Series | XFL-SW Series Centrifugal Fans

01 

Applications of XFL-SW Series Fans 

      The XFL-SW series fans operate within the medium-to-low flow and medium-to-high pressure range, achieving a maximum efficiency of 85%. They are suitable for use as primary and secondary fans in circulating fluidized bed systems (35~410 tons/hour), high-pressure induced draft fans, dust removal fans, gas blowers, pulverized coal air supply fans, and main exhaust fans for sintering plants. The XFL-SW series fills a gap in the dimensionless curve with a pressure coefficient of 0.6, demonstrating superior performance and high efficiency in fan design. It can replace most operating points of the XFL-SY series, which has been widely used in power plants and metallurgy for years, and is also suitable for systems requiring higher flow rates than the XFL-SY series.    

02 

      XFL-SW Series Fan Selection Advantages  

      Example 1: Design parameters for a circulating fluidized bed fan: p1=1.2 kg/m³; flow rate=102,226 m³/h; total pressure=12,659 Pa. Selection: XFL-SW N17.3D (n=1480 r/min) is available. If XFL-SW is unavailable (no dimensionless curve data provided here), select XFL-SY N18D (n=1480 r/min).   

  Table 1 shows that for identical flow and pressure requirements, selecting XFL-SW N17.3D achieves 7.4% higher efficiency and 6.9% lower impeller power compared to XFL-SY N18D. The reduced unit size not only saves materials and lowers costs but also decreases rotor GD2, reduces critical rotor speed, extends bearing life, and enhances impeller strength.     Example 2: Below are operating parameters for a specific condition point of the Sanhua catalog model XFJ-EL N14D at n=1450 r/min; p1=1.2 kg/m³: Flow rate=70682 m³/h; Total pressure=11099 Pa; Fan efficiency (internal efficiency)=76%; Impeller power (internal power) = 276.16 kW. For equivalent parameters, selecting the XFL-SW N16D achieves higher efficiency and energy savings.

Table 2 demonstrates that for identical flow and pressure requirements, the XFL-SW16D delivers 11.8% higher fan efficiency and 10.4% lower impeller power compared to the XFJ-LN14D.

03 

 Comparison of Impeller Dimensions for XFL-SW and XFJ-EL Fans         The XFJ-EL fan impeller incorporates an expansion section, specifically a vaneless diffuser, with an outlet diameter 1.15 times that of the blade outlet diameter.

    Table 3 shows that the XFL-SWN16D and XFJ-ELN14D have equal impeller outer diameters; The impeller width is narrower, and the larger ratio of outlet to inlet area implies that the dynamic pressure difference of the XFL-SWN16D is lower than that of the XFJ-ELN14D. To achieve the same static pressure difference, selecting the XFL-SW allows for a smaller model size compared to the XFJ-EL. Additionally, the XEI-EL is a forward-curved fan with a steeper performance curve, making it prone to power overload at high flow rates. The XFL-SW is a backward-curved fan with a smoother performance curve, making it less prone to overload. Particularly in applications with high dust content, the XFL-SW employs numerical simulation of the three-dimensional flow field within the impeller to optimize the dimensions of the flow passage. This results in an inlet angle that aligns with the actual airflow direction, minimizing blade inlet wear. In contrast, XEJ-EL is a forward-curved fan unsuitable for high-dust environments. XFL-SW resolves the blade inlet wear issues present in XFL-SY, XFJ-EL, and similar fan types, extending impeller service life—a significant competitive advantage for market participants.

04

XFL-SW Fan Parameters