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

Controlling the dust nuisance while charging the coal
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)
Prevention of clinker formation in the oven
All of these

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Fuels and Combustion
The main drawback of supplying more excess air in the combustion of fuel is the

Excessive power requirement of air blower
Enhanced sensible heat loss in the flue gas
Intermittant and uncontrolled combustion of the fuel
High exit flue gas temperature from the furnace

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