The process
Dye houses are hot and humid, with steam and chemical vapour from the machines. Roof extractors and supply fans control the floor, fume extraction serves the chemical stores, and the boiler fan set serves the steam supply.
The gas at the fan
Air saturated with moisture from drying, with condensation on any cool surface. Drainage, a shaft seal and a material that tolerates wet running are part of the specification.
Selection for this duty
| Blade form | Backward curved or aerofoil for the best efficiency on clean gas |
| Material of construction | Stainless steel wetted parts, with drains in the casing and a shaft seal |
| Drive and bearings | Direct coupled or belt driven; belt drive where the duty point may need tuning at site |
| Also specified | Casing drain at the lowest point |
| Density at the fan | At about 120°C the gas density is close to 0.90 kg/m³, 75% of standard air. Pressure developed and power drawn fall in the same ratio, so the selection is made at this density and the motor is checked at cold start. |
Supplies combustion air to a boiler or furnace, pushing ambient air through the air heater and into the windbox against the furnace draft. Clean air, so the blade is chosen for efficiency. Client-stated blade types for the FD Fan in general: Backward curved and backward inclined.
Industries
Other fans in dyeing and finishing houses
FD Fan in other processes
Bagasse Fired BoilersRice Husk Fired BoilersAFBC BoilersCFBC BoilersPulverised Coal Fired BoilersOil and Gas Fired BoilersBiomass Fired BoilersThermic Fluid HeatersHot Air GeneratorsBlast Furnace Hot Blast StovesRefinery Fired HeatersPulp Mills and Recovery BoilersCaptive Power PlantsDistillery Spent Wash Incineration Boilers
Services on this fan
Fan and System Performance TestingFan Energy AuditRetrofit of Low Efficiency FansDynamic Balancing and Vibration AnalysisCondition Monitoring and TroubleshootingInstallation, Commissioning and After-sales Support
Information needed to select or quote
- Duty point. Volume flow and static pressure at the fan inlet, with the gas density and temperature or the conditions to derive it.
- Operating conditions. Site altitude, normal operating temperature and continuous or intermittent duty.
- Gas stream. Dust loading and particle size, corrosive species, moisture, upset temperature and any tendency of the material to deposit on the impeller.
- Mechanical. Rotation viewed from the drive end, discharge orientation and motor power.