Tea

What the fans do here

Tea factories use hot air fans on the withering troughs and dryers, exhaust fans on the dryer outlet, and dust extraction on the sorting and packing lines. Trough fans are the characteristic duty: large volume, low pressure, long running hours.

Applications in this industry

Application	What it does	Type usually selected
Trough Fan	Blows a large volume of ambient or warmed air through the bed of green leaf on a withering trough. Low pressure, long running hours, and a fan that must be easy to clean.	Axial
Hot Air Fan	Circulates or supplies air at elevated temperature to a dryer, oven or kiln. Selected at the hot density with the shaft and bearing arrangement built for continuous hot running.	Backward curved and backward inclined
Dust Collector Fan	The fan behind a bag filter, cyclone or multiclone on a dust extraction system. Placed on the clean side where possible so the blade can be chosen for efficiency.	Backward inclined and radial tipped
Ventilation Fan	Moves air through a plant or building for fresh air supply, heat removal and fume dilution where the system is ducted. Low pressure, long hours, so efficiency and noise set the selection.	Backward inclined and forward curved

Processes in this industry

Equipment supplied

Information needed to select or quote

1. Duty point. Volume flow and static pressure at the fan inlet, with the gas density and temperature or the conditions to derive it.
2. Operating conditions. Site altitude, normal operating temperature and continuous or intermittent duty.
3. Gas stream. Dust loading and particle size, corrosive species, moisture, upset temperature and any tendency of the material to deposit on the impeller.
4. Mechanical. Rotation viewed from the drive end, discharge orientation and motor power.