Steam Boilers, Engines, Nozzles and Turbines
Water tube boilers are those in which

Work is done during adiabatic expansion
Water passes through the tubes and flue gases around it
Change in enthalpy
Flue gases pass through tubes and water around it

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

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
Heat is transferred by bleeding some gas from furnace

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded in moving blades only
The steam is expanded both in fixed and moving blades continuously
The steam is expanded in nozzles only and there is a pressure drop and heat drop
The pressure and temperature of steam remains constant

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