Energy-Efficient Centrifugal Fan Series | XFGS-QS and XFYS-QS Series Centrifugal Fans

01 

Application  

     XFGS-QS and XFYS-QS furnace supply and induced draft fans are suitable for supply and induced draft fan systems in thermal power plants with capacities below 670 t/h. Unless otherwise specified, C4-73 can also be used for mine ventilation and general ventilation. The medium conveyed by the forced draft fan is air, with a maximum temperature not exceeding 80°C. The medium conveyed by the induced draft fan is flue gas, with a maximum temperature not exceeding 250°C. A dust removal device must be installed upstream of the induced draft fan to minimize dust content in the flue gas entering the fan. Based on typical power plant operating conditions, dust removal efficiency must not be less than 85%.   

02 

 Type        

Both supply and exhaust fans are single-inlet designs, available in 12 sizes ranging from No. 8 to No. 28.     When viewed from the motor end, a clockwise rotating impeller denotes a right-hand fan, indicated as "Right"; a counterclockwise rotating impeller denotes a left-hand fan, indicated as "Left".

     The fan outlet position is specified by the outlet angle of the casing.

     The fan employs a D-type drive configuration, utilizing an elastic coupling for transmission.   

  03 

 Structural Features 

       The fan primarily consists of an impeller, casing, inlet, regulating damper, and drive assembly.     1. The impeller features 12 backward-curved, airfoil-shaped blades welded between a conical front disc and a flat rear disc. The airfoil design ensures high efficiency, low noise, and high strength. Static and dynamic balancing guarantees smooth operation. Impellers for both standard and induced draft fans of the same size share identical construction.     2. The casing is a welded spiral shell constructed from ordinary steel plate. Single-inlet fans feature three casing configurations: sizes No. 8–No. 12 are monoblock (non-separable), sizes No. 14–No. 16 are split into two sections, and sizes No. 18–No. 28 are split into three sections. The spiral casing and plates of induced draft fans are appropriately thickened to prevent wear.     3. The converging, streamlined inlet is an integral structure bolted to the fan inlet side. 4. The regulating damper, axially mounted in front of the inlet, adjusts fan flow. Its range spans 0° (fully open) to 90° (fully closed). Viewed from the inlet, the damper handle is positioned on the right side. For clockwise rotation fans, pushing the handle upward moves it from fully closed to fully open. For counterclockwise rotation fans, pulling the handle downward moves it from fully closed to fully open.     5. The drive shaft is made of high-quality steel and supported by rolling bearings. Two types of bearing housings are used: Integral simple bearing housings for sizes №8 to №16: Nos. 18–28 use two independent bearing housings. The bearing housings are equipped with a thermometer and oil level indicator (exhaust fans only). Lubricating oil uses L-AN46 full-loss system oil; add oil according to the oil level mark requirements. For No. 8–No. 16 integral bearing housings using grease lubrication, an oil baffle plate must be installed on the ball bearing side of the housing; its mounting groove is pre-fabricated. The induced draft fan is equipped with a water cooling system, thus requiring installation of water supply pipes. Water consumption varies with ambient temperature, typically estimated at 0.5–1 m³/h.   

  04 

 XFGS-QS, XFYS-QS Fan Parameters