Stoker Classification

According ASHRAE coal stokers for automatic feeding fuel to a furnace can be classified after their coal burning capacities:

• Class 1 Stokers - 10 to 100 lbs (4.5 to 45 kg) coal per hour
• Class 2 Stokers - 100 to 300 lbs (4.5 to 135 kg) per hour
• Class 3 Stokers - 300 to 1200 lbs (135 to 540 kg) per hour
• Class 4 Stokers - more than 1200 lbs (more than 540 kg) per hour

Bituminous coal with an ash fusion temperature of 2200 ^oF to 2600 ^oF is ideal for stoker operations.

Depending on the construction of the stoker the size of the coal should be between 1 1/4-inch to 3/4-inch.

Oil treatment of the coal is quite common to reduce the dust problem. Oil treatment of the coal also adds lifetime to mechanical conveyors, feed screws etc.

Temperature ^oC
K
^oF

Length m
km
in
ft
yards
miles
naut miles

Area m²
km²
in²
ft²
miles²
acres

Volume m³
liters
in³
ft³
us gal

Weight kg_f
N
lbf

Velocity m/s
km/h
ft/min
ft/s
mph
knots

Pressure Pa
bar
mm H₂O
kg/cm²
psi
inches H₂O

Flow m³/s
m³/h
US gpm
cfm