Stoker Classification

Coal stokers can classified on basis of coal burning capacity

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

• 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 the mechanical conveyer construction, the feed screw etc.

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