Fuels and Combustion
Traces of tar fog present in the coke oven gas is removed by

Cyclone separator
Washing with monoethanolamine
Electrostatic precipitator
Wet packed scrubber

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Fuels and Combustion
The weathering index of a coal

Gives an idea of the fusion temperature of ash
Is related to its calorific value
Is a measure of its caking tendency
Is a measure of its size stability, when stored & exposed to weather

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