• Airochem Engineering Company

BOILER FANS

Airochem Engineering offers Boiler Fans. Various types and sizes of centrifugal fans for all applications catering to the needs of industries are available. For boiler application, they are nomenclatured as induced draft (ID) forced draft (FD) and secondary air (SA) fans. It is available in capacities as hereunder: ID fan - 66 m3/sec, 390 mm, WGSP 180°C, 750 RPM with 500 HP motor; FD fan - 50 m3/sec, 170 mm, WGSP 40°C, 1470 RPM with 200 HP motor; and SA fan - 16.3 m3/sec, 600 mm WGSP, 180°C, 1470 RPM with 200 HP motor. Total efficiencies of the fans range up to 83% and higher efficiency fans can be designed by incorporating high performance fan features like selection of low inlet entry angles, rounded entry by curve formed shroud, "S" type or twisted blades to achieve low entry inlet angle and high outlet angles in same configuration. To achieve best possible efficiency low inlet angles and higher diameters are used to make up for low outlet angles. These features, with properly designed inlet box having turning vanes can achieve 90% total efficiencies. ID fan impellers are constructed in backward inclined straight blades duly hard faced for easy release of fly ash dust particles to reduce impeller erosion. Construction material can be carbon steel, alloy steel or stainless steel to withstand duly conditions. FD and SA fan impellers are generally fabricated in carbon steel. Fan casings are constructed in minimum 5 mm thick carbon steel duly stiffened for mechanical strength. Shafts and bearings are designed for minimum stresses and predetermined life respectively. VIV dampers are supplied for power saving when same fan operates at different operating points.