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

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

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Steam Boilers, Engines, Nozzles and Turbines
A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

Purchased from several parties and packed together at site
Packaged boiler does not exist
Supplied by same manufacturer loose and assembled at site
Supplied mounted on a single base

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