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Stoker Classification

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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.

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Related Topics


Combustion processes and their efficiency. Boiler house and chimney topics. Properties of fuels like oil, gas, coal and wood and more. Safety valves and tanks.

Related Documents

Anthracite Coal

Anthracite coal is available in a number of different grades.

ASHRAE - American Society of Heating, Refrigerating and Air-Conditioning Engineers

ASHRAE Standards.

Coal - Classification

Classification of coal based on volatile matter and cooking power of clean material.

Standard Grade Coal - Heat Values

Standard grades coal heat values.

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