Steam Boilers, Engines, Nozzles and Turbines
The aim of a compound steam engine is

To reduce the length of stroke
To reduce the ratio of expansion in each cylinder
All of these
To reduce the temperature range in each cylinder

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

Feed pump is employed to supplement natural circulation in water wall type furnace
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 converted into steam in one pass without any recirculation
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

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Conversion into steam at the same pressure at which feed water is supplied
Conversion into steam at atmospheric condition
And its corresponding conversion into dry steam at desired boiler pressure
And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²

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Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine

The expansion of steam takes place partly in the fixed blades and partly in the moving blades
The steam is expanded from a high pressure to a condenser pressure in one or more nozzles
The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
The pressure and temperature of steam remains constant

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