Steam Boilers, Engines, Nozzles and Turbines
Primary air is the air used to

Air delivered by forced draft fan
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Transport and dry the coal
Provide air around burners for obtaining optimum combustion

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Steam Boilers, Engines, Nozzles and Turbines
Stoichiometric quantity of air is the

Air required for complete combustion of fuel with no excess air
Air present in atmosphere at NTP conditions
Air required for optimum combustion so as to have reasonable excess air
Air required to convert CO into CO₂

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