The process
Rice husk burns in a fluidised bed or on a grate and leaves an ash that is largely silica. The ash erodes anything it touches at velocity, so the ID fan is built with wear liners and the dust collector is placed ahead of it. Rice mills and husk-fired captive power plants run these boilers at steady load for long periods.
The gas at the fan
Rice husk ash is high in silica and among the most abrasive fly ashes a boiler fan handles. Blade wear is the limiting factor; wear liners, hard facing and a blade form that resists erosion set the design.
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 180°C the gas density is close to 0.78 kg/m³, 65% 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 rice husk fired boilers
ID FanFD FanSA FanPA FanCombustion Air BlowerSeal Air BlowerDust Collector FanBag Filter FanVent SilencerVentilation Fan
Fan Silencer in other processes
Bagasse Fired BoilersAFBC BoilersCFBC BoilersPulverised Coal Fired BoilersOil and Gas Fired BoilersWaste Heat Recovery BoilersBiomass Fired BoilersThermic Fluid HeatersBlast 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.