Fuels and Combustion
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

Coke oven gas
Pitch
Pulverised coke
Tar

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Fuels and Combustion
Sometimes water is sprayed during coal charging in the coke oven, which helps in

Prevention of clinker formation in the oven
All of these
Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)
Controlling the dust nuisance while charging the coal

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