Fuels and Combustion
Preheating of combustion air is done to

Increase the adiabatic flame temperature
Complete the combustion of fuel
Reduce its requirement for effecting the complete combustion
Increase the calorific value of the fuel

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

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

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