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

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

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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

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

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