Fuels and Combustion
The main function of primary air in pulverised coal fired burner is to

Preheat the tertiary air used for complete combustion of CO to CO₂
Dry and transport the coal
Burn CO to CO₂
Have proper combustion by supplying it around the burner

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Fuels and Combustion
Calorific value of

Light paraffinic fuel oils is equal to that of equivalent olefins
N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is lower than that of equivalent olefins
Light paraffinic fuel oils is higher than that of equivalent olefins

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