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

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

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

To convert reciprocating motion of the piston into rotary motion of the crank
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To provide reciprocating motion to the slide valve
To provide simple harmonic motion to the D-slide valve

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