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

Washing with monoethanolamine
Cyclone separator
Wet packed scrubber
Electrostatic precipitator

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Fuels and Combustion
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

It reduces its calorific value tremendously
It reduces its flame temperature tremendously
There are chances of explosion during preheating
The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

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