The process
Recovery boilers, lime kilns and digesters in a pulp mill need the boiler fan set, non-condensable gas handling, and scrubbing of odorous gases. Corrosion and odour are the design concerns alongside the usual boiler duties.
The gas at the fan
Mixed biomass fuels give variable ash and moisture. The fan is sized for the worst fuel in the mix, with wear protection and deposit shedding as for bagasse.
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 170°C the gas density is close to 0.80 kg/m³, 66% 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. |
Cuts the noise from steam or gas expanding from high pressure to atmosphere at safety valve outlets, start-up vents and blow-down lines. Client-stated blade types for the Vent Silencer in general: Silencer.
Industries
Other fans in pulp mills and recovery boilers
Vent Silencer in other processes
Bagasse Fired BoilersRice Husk Fired BoilersAFBC BoilersCFBC BoilersPulverised Coal Fired BoilersOil and Gas Fired BoilersBiomass Fired BoilersFlare and Pressure Relief SystemsCaptive Power PlantsGenerator and Engine 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.