The process
Paddy dryers are fired with husk in a furnace or hot air generator, with the hot air fan supplying the dryer and cyclones taking husk dust from the milling section. Husk ash and husk dust are both abrasive.
The gas
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 process
| Role | Pre-collector for the coarse fraction ahead of a bag filter or scrubber |
| Construction | Mild steel with wear plates at the inlet |
| Discharge | Hopper with rotary air lock valve |
Types, construction and performance of the cyclonic separator.
Industries
Fans in rice mills and paddy dryers
Cyclonic Separator in other processes
Ceramic Body Spray DryersFertilizer Rotary Dryers and CoolersFood and Dairy Spray DryersRotary DryersTobacco Primary ProcessingFlour and Grain MillsCoal Handling PlantsMineral Crushing and ScreeningPlywood and Wood ProcessingAnimal Feed MillsFoundry Sand Reclamation
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.