Induced draft fans & blowers
Induced draft fans and blowers
The induced draft fan is a fan which generates negative pressure through the rotation of the impeller, and then extracts air from the equipment. Normally, install it at the end of the boilers in order to extract hot flue gas in the furnace. In daily life, Usually divide the fans into induced draft fans and blowers according to the positive and negative pressure usage.
Introduction to induced draft fans and blowers
Induced draft fans are widely used in factories or manufacturers plant, mines, tunnels, cooling towers, vehicles, ships and buildings for ventilation, dust removal and cooling; boilers and industrial furnaces and kilns for ventilation and induced air; air conditioning equipment and household appliances for cooling and Ventilation; drying and delivery of grain; inflation and propulsion of wind tunnel wind source and hovercraft.
The working principle of the induced draft fan is almost same as the turbo compressor, except for the air flow rate. The induced draft fan is much lower than turbo compressor. But, the pressure between them have a little difference.
Performance characteristics:
As for the hardness of the composite ceramic layer on the working surface of the induced draft fan impeller is HRA≥86, the secondary sintered silicon nitride toughened ceramics or zirconia toughened alumina ceramics can be used up to HRA94 or higher in local severely worn parts. Its particle erosion and wear resistance is at least 5 times higher than that of conventional tungsten carbide surfacing, spray welding and alloy powder lump welding, and more than 100 times higher than the base 16Mn steel; the thickness of the 1.5 mm ceramic sheet actually can be used for five years, and the average wear is less than 0.2 mm.
Parameter information of Golta induced draft fans
Pressure types | Low pressure, medium pressure, high pressure |
Drive types | Direct and belt driven |
Materials | Carbon Steel, Stainless steel |
Temperature℃ | (-40 up to 350℃) |
Power(kw) | 0.06kw up to 4000kw |
Air rate(M3/H) | 160M3/H up to 1500000M3/H |
Pressure(Pa) | Single stage centrifugal pressure up to 20000Pa, Multistage centrifugal pressure up to 70000Pa |
Direction of rotation
From the motor side to see the rotation of the impeller and are divided into two sides: right and left side. Normally, there are different eight type angles, according to the diagram shown, and also can be customized as clients’ requirement.
The application to induced draft fans
Factories ventilation system, mines, tunnels, cooling towers, vehicles, ships and buildings, boilers ;industrial furnaces and kilns;air conditioning equipment, household appliances ; delivery of grain; wind tunnel wind source; hovercraft.
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What's the advantages of induced draft fans?
- It can lower horsepower requirements if the effluent air is very hot (horsepower varies inversely with the absolute temperature)
- It’s better accessibility of fans and upper bearings for maintenance.
- It’s better accessibility of bundles for replacement.
- And accommodates higher process inlet temperatures.
