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

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

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

Two different makes of boilers operating under the same operating conditions
The two different boilers of the same make
The given boiler with the model
Any type of boilers operating under any conditions

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