Fan Silencer for Blast Furnace Hot Blast Stoves

The process

Hot blast stoves heat the blast air for the furnace, burning cleaned blast furnace gas with combustion air from dedicated fans. The duty is clean, steady and critical, with dampers switching stoves between heating and blowing.

The gas at the fan

Clean air to the hot blast stoves at steady pressure. A combustion air duty where reliability over long runs is the requirement.

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 40°C the gas density is close to 1.13 kg/m³, 94% 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 blast furnace hot blast stoves

Fan Silencer in other processes

Information needed to select or quote

1. Gas volume and temperature. Actual flow at the inlet, normal and upset temperature, moisture.
2. Dust or pollutant. Inlet loading, particle size distribution, whether it is abrasive, sticky, hygroscopic or combustible; for gases, the species and concentration.
3. Required outlet. The emission limit or clean gas concentration the unit must meet.
4. Site. Available space and height, material of construction preferences, and how the collected material is to be discharged.