Steam Boilers, Engines, Nozzles and Turbines
In natural circulation type boiler,

Water is converted into steam in one. Pass without any recirculation
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Feed pump is employed to supplement natural circulation in water wall type furnace

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Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

Heat is transferred by bleeding some gases from furnace
By direct mixing
From heating an intermediate material and then heating the air from this material
From a metal wall from one medium to another

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