The process
Solid fuel thermic fluid heaters supply process heat in textile, chemical and food plants. The combustion side mirrors a small boiler: an FD fan under the grate or bed and an ID fan after the dust collector, both sized for the fuel in use.
The gas at the fan
Fluidised bed combustion carries bed material fines and fly ash in the flue gas. The dust is abrasive and the loading ahead of the collector is high, so the ID fan is placed after the dust collector wherever the layout allows.
Selection for this duty
| Construction | Absorptive annular design in mild steel; stainless steel where the gas is wet or corrosive |
| Density at the fan | At about 160°C the gas density is close to 0.81 kg/m³, 68% 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. |
An absorptive silencer at the fan inlet, outlet or in the duct, cutting fan noise with minimum pressure loss. Client-stated blade types for the Fan Silencer in general: Silencer.
Industries
Other fans in thermic fluid heaters
Fan Silencer in other processes
Bagasse Fired BoilersRice Husk Fired BoilersAFBC BoilersCFBC BoilersPulverised Coal Fired BoilersOil and Gas Fired BoilersWaste Heat Recovery BoilersBiomass Fired BoilersBlast Furnace Hot Blast StovesSinter PlantsSteel Reheating FurnacesPharmaceutical Clean RoomsRefinery Fired HeatersFlare and Pressure Relief SystemsGas Compressor StationsCaptive Power PlantsGenerator and Engine RoomsCar Parks and TunnelsNuclear Facility VentilationHospitals and LaboratoriesData Centres and Equipment RoomsDistillery Spent Wash Incineration Boilers
Information needed to select or quote
- Gas volume and temperature. Actual flow at the inlet, normal and upset temperature, moisture.
- Dust or pollutant. Inlet loading, particle size distribution, whether it is abrasive, sticky, hygroscopic or combustible; for gases, the species and concentration.
- Required outlet. The emission limit or clean gas concentration the unit must meet.
- Site. Available space and height, material of construction preferences, and how the collected material is to be discharged.