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
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Air delivered by induced draft fan

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston rod is

To convert heat energy of the steam into mechanical work
To exhaust steam from the cylinder at proper moment
To guide motion of the piston rod and to prevent it from bending
To transfer motion from the piston to the cross head

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